CN2453591Y - Maintenance-free and explosion-proof type phase interruption protector - Google Patents

Abstract

The utility model discloses a maintenance-free and explosion-proof type phase interruption protector which is composed of a pi type magnet, a moving armature iron sheet, a connecting rod, a static and a moving contacts, a spring, a fixing bracket and a close over. The outside of the utility model is provided with an explosion-proof casing; space between the explosion-proof casing and the fixing bracket is fully sealed by insulating paint. The utility model has the advantages of simplicity, low cost, no maintenance, convenient operation and general purpose on motors of various powers; the utility model is especially suitable for specific environments of easy explosion, easy ignition and easy corrosion; after the utility model is fully sealed, the static and the moving contacts and armature iron in the phase interruption protector are free from the external pollution and corrosion to make the service life of the utility model long; the utility model can also be used for controlling the automatic throw-in and the automatic cut-off of a condenser bank.

Description

Non-maintaining explosion-proof type phase failure protector

The utility model belongs to threephase asynchronous open phase protection technical field, is specifically related to a kind of non-maintaining explosion-proof type phase failure protector.

Threephase asynchronous is in operation often because multiple reasons such as blown fuse, the oxidation of circuit copper-aluminium joint are non-conductive, appliance switch contact and poor contact of contacts cause an outage mutually, phase failure accident takes place, and motor is not in time found to burn owing to single phasing again.According to the data introduction of North China bureau in charge of electricity, phase failure accident causes that motor burns accounts for 85% of the total spoilage of motor.Open phase protection in the market generally is the electrical type phase failure protector, because of the failure rate of itself high not popular with users.Chinese patent ZL94228790.8 discloses a kind of phase failure relay; because of it does not have coil, does not have the electrical equipment consumable accessory, only form by several gadget parts, can accomplish in 3 years non-maintaining; but it does not possess explosion-proof performance, can not adapt to certain user's requirement.Particularly under some particular surroundingss, as the application places moist, inflammable, explosive, that chemical corrosivity is stronger, electric equipment in sector applications such as chemical industry, colliery, oily factories all has specific (special) requirements, Yun Hang motor is also a lot of under these conditions, think that the supporting device of motor also should consider its application conditions.There are flame-proof electric motor, flame-proof switch in China at present, does not still have explosion-proof phase failure protector.

The purpose of this utility model provides a kind of non-maintaining explosion-proof phase failure protector.

The technical solution adopted in the utility model is: non-maintaining explosion-proof type phase failure protector comprises Π type magnet, moving armature sheet, connecting rod, moving contact, fixed contact, spring, fixed mount, leads armature chamber and capping, the moving armature sheet places leads in the armature chamber, the middle part of moving armature sheet connects connecting rod, connecting rod stretches in the fixed mount, be connected to moving contact on the connecting rod, its lower end is connected with spring; Fixed contact is equipped with in the inside of fixed mount, and Π type magnet iron studs with short-circuited conducting sleeve, and two terminations are fixed in the capping of leading armature chamber, do not have fixed coil on the magnet.Explosion-resistant enclosure is arranged at the phase failure protector bottom, and the following parts of Π type magnet all are contained in the explosion-resistant enclosure, and is totally-enclosed with the insulating varnish class with the space outside interior, the fixed mount at explosion-resistant enclosure.

The utility model structure is very simple, and cost is low, and is non-maintaining, easy to use, and the motor of various power all can be general, especially is fit to explosive, inflammable, corrosion-prone particular surroundings and uses.After totally-enclosed, phase failure protector inside is quiet, moving contact, armature are also avoided external contamination and corrosion, and the life-span of protector prolongs more.

Further specify structure of the present utility model below in conjunction with drawings and embodiments.

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

Fig. 2 is the shell schematic diagram of the utility model three disjunctors;

Fig. 3 is used for the main circuit diagram of explosion-proof A.C. contactor control motor for the utility model;

Fig. 4 is used for the control circuit figure of explosion-proof A.C. contactor control motor for the utility model;

Fig. 5 is the phase failure protector application principle figure that coil is arranged;

Fig. 6 controls electrical schematic diagram automatically for the utility model is used for the capacitor group.

Non-maintaining explosion-proof type phase failure protector by Π type magnet 1, moving armature sheet 4, connecting rod 6, moving contact 8, fixed contact 7,9, spring 10, fixed mount 5, lead armature chamber 3 and capping 2 constitutes; moving armature sheet 4 places leads in the armature chamber 3; the middle part of moving armature sheet connects connecting rod 6; connecting rod 6 stretches in the fixed mount 5; be connected to moving contact 8 on the connecting rod; its lower end is connected with spring 10; fixed contact 7,9 is equipped with in the inside of fixed mount 5; Π type magnet 1 studs with short-circuited conducting sleeve 11; two terminations of Π type magnet 1 are fixed in the capping of leading armature chamber 3, do not have fixed coil on the Π type magnet 1.It is very light to lead armature plate 4, hour also can keep the protector adhesive in motor zero load, electric current, and only just release under the situation of the phase failure is so the resetting ratio of claimed device is less than 0.3.Except that Π type magnet, other parts all are contained in the explosion-resistant enclosure 14, explosion-resistant enclosure 14 with interior and lead beyond the armature chamber 3, chamber, contact 12 between the space, totally-enclosed with insulating varnish class 13, lead-in wire is exposed at housing 14 outsides, and chamber, contact 12 is with the heat of leading armature chamber's 3 generations can capping comes out with dispelling the heat preferably by Π type magnet.Can make three connection types (three connect together) for easy to use.Use of the present utility model is divided into three kinds of situations:

One, the motor of A.C. contactor control

Three phase lines of motor are passed the Π type window (or how around several circles) of phase failure protector fixed magnets respectively, and when the power line outage of arbitrary phase, the corresponding protection device discharges; its normally-closed contact disconnects; the ac contactor coil dead electricity, main contact disconnects, and motor shuts down.Interrupt mutually when taking place one, and the adhesion of A.C. contactor main contact, still during single phasing, the alarm electric bell rings motor.Cut off the power supply mutually as B, 2DJ protector dead electricity discharges, and 2DJ1 disconnects, the 2DJ2 closure, and A switches on mutually as usual with C mutually, and during single-phase motor running, the trend of circuit for alarming is 2RD → TA → 1DJ1 → 2DJ2 → ring coil → zero line power supply, and electric bell rings; And for example A cuts off the power supply mutually; 1DJ protector dead electricity discharges; 1DJ1 disconnects; the 1DJ2 closure; B switches on mutually as usual with C mutually; during single-phase motor running, the current trend of circuit for alarming is 1RD → RT normally closed contact → JC coil (logical little electric current JC is still release condition) → 3DJ1 → 2DJ1 → 1DJ2 → ring coil → zero line power supply, and electric bell rings.

Two, cooperate current transformer to use

To miniature threephase asynchronous, take above-mentioned two kinds of methods to do open phase protection certainly, but because of electric current is very little, phase line the Π of protector fixed magnets type window around the number of turn will be many, so not too convenient.Meet this situation with 1.0 square millimeters of enamel wires, around about 100 circles, cooperating three current transformers to do the open phase protection effect will be better at Π type window.Operating principle and alarm are as hereinbefore.Because of the power line voltage of high-voltage three-phase asynchronous motor is very high, can not be directly pass from the Π type window of magnet, just need to cooperate current transformer do open phase protection, as Fig. 5.

Three, the utility model can not only be used on the motor open-phase protection, and also has a lot of other purposes.Single use can the control capacitor group drop into and cut off automatically.

Do not having under the situation of this protection, be located at the not automatically control of capacitor group of electric substation, can not be according to the using and stop of load, instant input and excision reduce power factor.If a single protector is installed on arbitrary phase power supply, power line passes from protector Π type window, as Fig. 6, though the contact CJ1 of electric substation often connects, and the load off-duty, CJ2 contact access failure, power line had only voltage and did not have electric current, not adhesive of protector DX this moment, normally opened contact DX1 disconnects, the not adhesive of CJ3 coil, the CJ3 contact is obstructed, and capacitor group Cz does not put into operation; Only after load starts; CJ2 contacting, power line have electric current to pass through, protector DX adhesive; normally opened contact DX1 connects; the adhesive of CJ3 coil, the CJ3 contacting, capacitor group Cz puts into operation; normally-closed contact DX2 disconnects simultaneously; the CJ4 coil discharges, and the CJ4 contact disconnects, and discharge lamp Dz does not have electricity and do not work.If load is shut down; the CJ2 contact disconnects, and power line no-current protection device DX discharges, and normally opened contact DX1 disconnects; the CJ3 coil discharges; the CJ3 contact disconnects, and capacitor group Cz is out of service automatically, simultaneously; normally-closed contact DX2 closure; the adhesive of CJ4 coil, the CJ4 contacting, capacitor group Cz discharges automatically by discharge bulb Dz.This protector starts according to load or stops to reach automatic control capacitor group Cz and drops into or discharge.

Claims (2)

1, a kind of non-maintaining explosion-proof type phase failure protector, it comprises Π type magnet (1), moving armature sheet (4), connecting rod (6), moving contact (8), fixed contact (7), (9), spring (10), fixed mount (5), leads armature chamber (3) and capping (2), moving armature sheet (4) places leads in the armature chamber (3), the middle part of moving armature sheet (4) connects connecting rod (6), connecting rod (6) stretches in the fixed mount (5), be connected to moving contact (8) on the connecting rod (6), there is spring (10) its lower end; Fixed contact (7), (9) are equipped with in the inside of fixed mount (5), and Π type magnet (1) studs with short-circuited conducting sleeve (11), and two terminations are fixed in the capping (2) of leading armature chamber (3), and magnet does not have fixed coil on (1); It is characterized in that explosion-resistant enclosure (14) is arranged at the phase failure protector bottom, the following parts of Π type magnet (1) all are contained in the explosion-resistant enclosure (14), and are totally-enclosed with insulating varnish class (13) with the space outside interior, the fixed mount (5) at explosion-resistant enclosure (14).

2, non-maintaining explosion-proof type phase failure protector according to claim 1 is characterized in that making three connection types.

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