CN2196819Y

CN2196819Y - Electricity-saving protector for ac contactor

Info

Publication number: CN2196819Y
Application number: CN 94240115
Authority: CN
Inventors: 程照勋
Original assignee: ANQIU COUNTY STOVE FACTORY
Current assignee: ANQIU COUNTY STOVE FACTORY
Priority date: 1994-03-31
Filing date: 1994-03-31
Publication date: 1995-05-10
Anticipated expiration: 2004-03-31

Abstract

The utility model relates to an ac contactor economize on electricity protection device, divide four bibliographic categories including clutch lever, control lever, dropout relay and support. The device is fixed on an alternating current contactor commonly used in a power grid through a pi-shaped support, and can play a remarkable electricity-saving protection role. The installation circuit of the AC contactor in the power grid is very simple, the AC contactor mainly comprises a starting circuit, a power failure circuit and an overcurrent protection circuit, and when the AC contactor is closed, a mechanical device locks the contact of the AC contactor so that the current flowing through the electromagnet coil is zero, thereby effectively avoiding the phenomenon that the contactor is frequently burnt.

Description

Power-saving protection device for AC contactor

The utility model belongs to the electric apparatus technical field.

For a long time, A.C. contactor has obtained using widely in electric power network, still, owing to after in a single day it put into operation, flow through bigger electric current in the electromagnet coil, thereby not only consume bigger electric energy always, and be easy to be burnt, cause bigger economic loss.

In recent years, the electricity-saving protection scheme of many A.C. contactors has been proposed both at home and abroad, its overall design philosophy all is to increase some electronic control circuits, starting resistor or electric current and the voltage of keeping work or electric current are separated, promptly use bigger voltage or current start, and keep the contactor adhesive with less voltage or electric current, to reach the purpose of electricity-saving protection, though, these schemes have all obtained obvious effects, its fatal shortcoming is: 1. the economize on electricity can not reach 100%(put into operation the back), because all there is electric current to flow through in these attachment devices and the solenoid; 2. along with the minimizing of keeping electric current in the solenoid, its functional reliability utmost point be cannot say for sure to demonstrate,prove.Secondly, along with the increase of these additional control circuits, production cost is also along with increase.

The purpose of this utility model is under the prerequisite that does not change the A.C. contactor original structure, by increase an attachment device reach the economize on electricity 100%(put into operation the back) purpose, and fundamentally solve the phenomenon that the A.C. contactor life-span is short, often burnt, the use circuit of this device in electric power control also is provided simultaneously.

This device comprises trip(ping) lever, control lever, tripping relay and support four parts.Trip(ping) lever is the L type, and there is an arc slidably on its top, and the other end has the fastening card of a bending, so that fix with the armature of A.C. contactor; The front end of control lever has an arc tab, and there is a garden shape screw middle part, and end has an ellipse garden shape fastener hole; Tripping relay is made up of armature, iron core and electromagnet coil, and there is a rectangular sheet protruding upward the centre of armature, and top hole, garden can be fixed together armature and control lever; Support comprises fixed mount and bracing frame two parts, and fixed mount is π shape, and a side has a U-shaped hole, opposite side has shape hole, a garden, all be used for attachment device is fixed on the base of A.C. contactor, also there is shape hole, a garden on the top of bracing frame, can be the center fixed of control lever on bracing frame.

During installation, support is located to fix in U-shaped hole and shape hole, garden with the base of A.C. contactor respectively by the both sides of π shape fixed mount; The armature of trip(ping) lever and A.C. contactor is fixed by crooked fastening card; The centre of control lever and bracing frame are fixed at shape screw place, garden, and the end of control lever is fixed together through the armature of ellipse garden shape screw and tripping relay.

When this device used in control circuit power, its schematic circuit comprised start-up circuit, power failure circuit and current foldback circuit three parts; The normally open push button switch QA that start-up circuit comprises and fuse F joins and be serially connected in QA and the neutral line between A.C. contactor 1J; The normally open push button switch TA that the power failure circuit comprises and fuse F joins and be serially connected in TA and the neutral line between tripping relay 2J; Current foldback circuit is made of the two ends that many thermal relay normally opened contact RJ that use in parallel are attempted by normally open push button switch TA.

This device is suitable for the A.C. contactor of all specifications, model, and its structural parameters change to some extent because of employed A.C. contactor parameter is different.

This device actual motion in inserting power circuit proves that its working stability is reliable, put into operation back noiselessness, no temperature rise, economize on electricity 100%, and the phenomenon of thoroughly having avoided A.C. contactor to be burnt often, thereby obtained good result of use.

Accompanying drawing has provided embodiment of the present utility model, and its operation principle will be illustrated in conjunction with the accompanying drawings, wherein:

Fig. 1 is the plane structure chart of embodiment.

Fig. 2 is the circuit installation diagram of embodiment.

Whole device is made up of trip(ping) lever (1), control lever (2), tripping relay (3) and support (4) four parts.One end of trip(ping) lever (1) is arc tips (5), and the other end has the fastening card (6) of a bending; It is fixing with garden shape screw (8) and terminal ellipse garden shape fixing threaded hole (9) that control lever (2) comprises that arc tab (7), the centre of front end have; Tripping relay (3) comprises armature (10), iron core (11) and the electromagnet coil (12) that has fixing hole; Support (4) comprises fixed support (13) and the bracing frame (14) that fixes with A.C. contactor (15), fixed support (13) is π shape, one side has a U-shaped hole (17), opposite side has shape hole, a garden (18), be used for respectively fixing with the A.C. contactor base, there is a fixing hole (8) bracing frame upper end, is used for and control lever (2) is fixed together.

During installation, the both sides of fixed mount (13) fix with two screws (17) and (18) of A.C. contactor (15) respectively, trip(ping) lever (1) is fixing with the armature (16) of A.C. contactor (15) through fastening card (6), the interstitial hole (8) of control lever (2) fixes with bracing frame (14), and the hole, terminal ellipse garden (9) of control lever (2) is fixed together with the armature (10) of tripping relay (3).

The circuit installation diagram of this device embodiment comprises start-up circuit (19), power failure circuit (20) and current foldback circuit (21) three parts.The normally open push button switch QA that start-up circuit (19) comprises and fuse F joins and be serially connected in QA and the neutral line between A.C. contactor 1J; The normally open push button switch TA that power failure circuit (20) comprises and fuse F joins and be serially connected in TA and the neutral line between tripping relay 2J.Current foldback circuit (21) is attempted by normally open push button switch TA two ends by the normally opened contact RJ of several thermal relays that use in parallel and forms.

Power circuit in the circuit (22) and three phase supply circuit (23) are universal circuit.

Operation principle:

1. start the power switch HK that closes, press normally open push button switch QA, A.C. contactor 1J gets, armature (16) adhesive, normally opened contact 1C connects load, under the drive of armature (16), trip(ping) lever (1) slips in the tab (7) of control lever (2) and is locked, thereby after push-button switch QA disconnected the 1J dead electricity, because the mechanical caging of control lever and trip(ping) lever, contact IC was still closed, obviously, this moment 1J to be fully operational in electric current be zero state, so after in a single day contactor puts into operation, economize on electricity 100%.

2. have a power failure when needing to have a power failure, press TA, tripping relay 2J gets electric, and its armature (10) is by adhesive, and the end of the control lever that fixes with it (2) is left behind, because the leverage of bracing frame (14), the tab of control lever front end (7) moves upward, and loses the control action to trip(ping) lever, because of 1J is operated in power failure state, so trip(ping) lever (1) takeoffs under the effect of contactor antagonistic spring with the armature (16) of A.C. contactor, make contact IC outage.

3. overcurrent protection is when load current surpasses the operating current of thermal relay, its normally opened contact RJ closure, and tripping relay 2J gets; control lever (2) is inhaled; tab (7) moves upward, and trip(ping) lever (1) takeoffs with contactor armature (16), normally opened contact IC outage.

The trip(ping) lever of this attachment device, control lever and support all adopt galvanized iron sheet to manufacture, and tripping relay needs to select for use according to the A.C. contactor of different size.

Claims

1, a kind of A.C. contactor electricity-saving protector is characterized in that comprising trip(ping) lever (1), control lever (2), tripping relay (3) and support (4) four parts; Trip(ping) lever (1) is the L type, and there is an arc (5) slidably on its top, and the other end has the fastening card (6) of a bending, so that fix with the armature (16) of A.C. contactor; The front end of control lever (2) has an arc tab (7), and there is a circular port (8) middle part, and end has an oval fastener hole (9); Tripping relay (3) is made up of armature (10), iron core (11) and electromagnet coil (12), and the centre of armature has a rectangular sheet protruding upward, top circular hole (9) to be fixed together armature (10) and control lever (2); Support comprises fixed mount (13) and bracing frame (14) two parts, fixed mount (13) is π shape, one side has a U-shaped hole (17), opposite side that one circular port (18) is arranged, all be used for attachment device is fixed on the base of A.C. contactor, also there is a circular port (8) on the top of bracing frame (14), can be the center fixed of control lever (2) on bracing frame (14).

2, according to the said A.C. contactor electricity-saving protector of claim 1, when feature was installation, support (4) was located to fix in U-shaped hole (17) and circular port (18) with the base of A.C. contactor (15) respectively by the both sides of π shape fixed mount (13); Trip(ping) lever (1) is fixed by crooked fastening card (6) with the armature (16) of A.C. contactor (15); The centre of control lever (2) and bracing frame (14) are located to fix at circular screwhole (8), and the end of control lever (2) is fixed together through the armature (10) of ellipse screw (9) with tripping relay (3).

3,, it is characterized in that its schematic circuit comprises start-up circuit (19), power failure circuit (20) and current foldback circuit (21) three parts according to the said A.C. contactor electricity-saving protector of claim 1; The normally open push button switch QA that start-up circuit (19) comprises and fuse F joins and be serially connected in QA and the neutral line between A.C. contactor 1J; The normally open push button switch TA that power failure circuit (20) comprises and fuse F joins and be serially connected in TA and the neutral line between tripping relay 2J; The relay normally open contact RJ that current foldback circuit is used by parallel connection is attempted by normally open push button switch TA two ends and constitutes.