CN2763963Y

CN2763963Y - Combustion free device for explosion-proof motor

Info

Publication number: CN2763963Y
Application number: CN 200520025198
Authority: CN
Inventors: 刘玉考
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-01-25
Filing date: 2005-01-25
Publication date: 2006-03-08
Anticipated expiration: 2015-01-25

Abstract

The utility model relates to a combustion-free device for an explosion-proof motor and belongs to the technical field of relay protection. The utility model provides a combustion-free device for an explosion-proof motor, and the combustion-free device for an explosion-proof motor has high sensitivity, an overcurrent and an overheating protection functions. The utility model comprises a casing body, a bimetallic disc and two movable contacts, wherein one end of the bimetallic disc is fixed on an insulating plate; two fixed contacts which are corresponding to the movable contacts are respectively fixed on one end of each of two resistor bands; the other end of each of the two resistor bands is respectively fixed on the insulating plate and is respectively electrically connected with a wire connecting terminal; the two contact points are respectively fixed on a metal arm; the two metal arms are fixed on both sides of the same insulating connecting rack which is fixed to the other end of the bimetallic disc; the two metal arms are respectively electrically connected with a wire connecting terminal; a resistor band is arranged at a gap above the bimetallic disc; both ends of the resistor band are respectively electrically connected with a wire connecting terminal. The input terminal and the output terminal of each phase are both connected with a resistor band. The utility model, which has high sensitivity and has the overcurrent and the overheating protection functions simultaneously, is suitable for being used as a protective appliance for various motors, particularly explosion-proof motors.

Description

The fire-proof motor explosion-proof motor

Technical field

The utility model relates to a kind of fire-proof motor explosion-proof motor, belongs to technical field of relay protection.

Background technology

Chinese patent 91228718.7 discloses a kind of motor explosion-proof motor technology, it comprises bimetal disk, adjustment screw, moving contact and housing, and its objective is provides that a kind of simple in structure, contact gap is big, reliable operation, is difficult for producing the motor explosion-proof motor of misoperation.But this explosion-proof motor has only two-way to be provided with resistor disc, during use, can cause the motor three-phase current unbalance.In use, when open circuit fault appears in motor, contain one tunnel phase failure and the road phase failure that does not contain resistor disc of resistor disc, the take-off time of this explosion-proof motor bimetal leaf can differ several times, so this motor explosion-proof motor sensitivity is relatively poor.In addition, this unburned protector that is applicable to the motor of making star connection, applicable surface is little.In use, this explosion-proof motor need be received the asterism place of motor, thereby it has only the two-way overcurrent protection function, no short-circuit protection function.

Summary of the invention

Technical problem to be solved in the utility model is to overcome above-mentioned the deficiencies in the prior art part and provide a kind of widely applicable, highly sensitive, has the fire-proof motor explosion-proof motor of overcurrent, overheated double protection functions.

It is as follows to solve the problems of the technologies described above the scheme that is adopted:

A kind of fire-proof motor explosion-proof motor, it comprises housing, bimetal disk and two moving contacts, one end of bimetal disk is fixed on the insulation board, two fixed contacts corresponding with moving contact are fixed with an end of two resistive bands respectively, the other end of two resistive bands is separately fixed on the insulation board, and each is electrically connected with a binding post, described two contacts 15 respectively are fixed on the metal arm 6, two metal arms 6 are fixed on the both sides of same insulation link 4, insulation link 4 is fixed with the other end of bimetal disk 11, and two metal arm 6 each and a binding post a, c is electrically connected, the top of bimetal disk 11 is provided with a resistive band 13 at interval, the two ends of this resistive band 13 each with a binding post b, b ' electrical connection.

Above-mentioned fire-proof motor explosion-proof motor, the fixed form between said metal arm 6 and the insulation link 4 are that metal arm 6 is embedded on the insulation link 4; Be that screw, nut are connected and fixed between said insulation link 4 and the bimetal disk 11, and insulation link 4 respectively is provided with insulation spacer 10 up and down; Be connected for metal flexible cord 7 between two metal arms 6 and binding post a, the c.

Above-mentioned fire-proof motor explosion-proof motor, said metal flexible cord 7 outer suit porcelain tubes 8.

Above-mentioned fire-proof motor explosion-proof motor, said two resistive bands 2 are respectively fixing with a metallic heat radiating plate 5 with the end that fixed contact 3 is fixed, and an end of metallic heat radiating plate 5 and insulation board 1 are fixing.

Above-mentioned fire-proof motor explosion-proof motor, the set resistive band 13 in said bimetal disk 11 tops are fixed on the insulation supporting plate 12, and insulation supporting plate 12 is connected and fixed with insulation board 1.

Fire-proof motor explosion-proof motor provided by the utility model, all be connected with resistive band between its every phase input and output, so in use, no matter which occurs opening circuit mutually, the take-off time of its bimetal disk almost is identical, so highly sensitive, and has " overcurrent " and " overheated " dual-use function simultaneously.Its faults itself rate is extremely low, therefore to the overcurrent of motor, overheated, short circuit, open circuit and overload protection almost reaches absolutely, so safe and reliable.This fire-proof motor explosion-proof motor has three-phase input end and three-phase output end, so be applicable to the protector of making the delta connection motor.After three-phase input end of this protector or three-phase output end short circuit, the protector that it can make the motor of star connection again uses, and is widely applicable.Movement of the present utility model places in the housing of sealing, and both waterproof, anticorrosion was explosion-proof again, and it is installed in the motor, is the especially ideal protection articles for use of fire-proof motor of various motors.

Description of drawings

Fig. 1 is that the master of a kind of embodiment of the utility model looks cutaway view;

Fig. 2 is the B-B cutaway view of Fig. 3;

Fig. 3 is the A-A cutaway view of Fig. 1;

Fig. 4 is two metal arms of the present utility model and a kind of syndeton front view that the insulation link is fixed together;

Fig. 5 is a kind of contour structures axonometric drawing of the present utility model;

Fig. 6 is the movement wiring construction schematic diagram of fire-proof motor explosion-proof motor shown in Figure 1.

Drawing reference numeral is: 1. insulation board, 2. resistive band, 3. fixed contact, 4. insulation link, 5. metallic heat radiating plate, 6. metal arm, 7. metal flexible cord, 8. porcelain tube, 9. housing, 10. insulation spacer, 11. bimetal disks, 12. insulation supporting plates, 13. resistive bands, 14. end caps, 15. moving contacts.

Embodiment

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

Referring to accompanying drawing, the utility model comprises housing 9 bimetal disks 11 and two silver-colored moving contacts 15, one end of bimetal disk 11 is fixed on the insulation resin sheet 1 with screw, nut, two the silver-colored fixed contacts 3 corresponding with silver-colored moving contact 15 are fixed with an end points solid welding of two resistive bands 2 respectively, the other end difference riveted and fixed of two resistive bands 2 is on insulation resin sheet 1, and each is electrically connected with a binding post a ', c ' welding, housing 9 adopts the good plastic material of anti-permeability to manufacture, and and 14 employings of end cap fluid sealant sealing.End cap 14 can be manufactured with elastomeric material, and binding post passes from end cap 14 inside.Two silver-colored moving contact 15 each riveted and fixed are on a brass metal arm 6, two metal arms 6 are inlayed the both sides that are fixed on same insulation resin link 4, insulation link 4 is connected and fixed with screw, nut with the other end of metal video disc 11, and insulation link 4 is respectively established a mica insulation pad 10 up and down, in case bimetal disk 11 is with two metal arm 6 short circuits.Two metal arms 6 respectively are welded to connect with a binding post a, c respectively by one section metal flexible cord 7, and adopting metal flexible cord 7 is when preventing that motor from breaking down, and influence the bimetal disk take-off than the binding post of rigidity and cut off the electricity supply.Be anti-short circuit and high temperature ageing, metal flexible cord 7 outer preferably covers are loaded onto porcelain tube 8.

For reasonably utilizing the space in the housing 9, each parts of reasonable Arrangement the utility model movement, one resistive band 13 is set above bimetal disk 11 at interval, this resistive band 13 is connected on the insulation supporting plate 12, each is welded to connect the two ends of resistive band 13 with binding post b, b ', and insulation supporting plate 12 is connected and fixed with insulation board 1.As shown in fig. 1, insulation supporting plate 12 can be fixed on the insulation board 1 with bimetal disk 11 shared screw, nuts.

Above-mentioned fire-proof motor explosion-proof motor snaps in order to prevent that the Yin Wendu of solder joint place is too high, can each be fixing with a metallic heat radiating plate 5 welding at the fixing end of resistive band 2 and fixed contact 3, and an end of metallic heat radiating plate 5 is riveted on the insulation board 1.

Consult accompanying drawing, when the utility model was used for the electric motor protecting of delta connection, its binding post can adopt three to advance three versions that go out.

When the utility model is used for the electric motor protecting of star connection, three of this explosion-proof motor can be advanced or three go out short circuit and get final product, as a, b, three binding post short circuits of c, or a ', b ', three binding post short circuits of c ' are got final product.In addition, also can be according to user's needs, when making this fire-proof motor explosion-proof motor, in housing 9, outside housing 9, only stay three binding posts to get final product wherein three binding post short circuits of a, b, c or a ', b ', c '.

Housing 9 of the present utility model can be made into rectangle, truncated cone, ellipse or oval taper type etc.

Operation principle of the present utility model is:

1. overheat protective function: because of this explosion-proof motor is installed in the motor in use, thus work as motor overheating, when temperature reaches set point; bimetal disk 11 promptly can take-off; upwards dig, two moving contacts of explosion-proof motor are separated with two fixed contacts, realize power-off protection.

2. overcurrent protection function: when overcurrent appearred in motor, when institute's overcurrent surpassed set point, the set resistive band of explosion-proof motor can generate heat, and when temperature reached set point, bimetal disk can take-off, realizes power-off protection.

Claims

1. fire-proof motor explosion-proof motor, it comprises housing, bimetal disk and two moving contacts, one end of bimetal disk is fixed on the insulation board, two fixed contacts corresponding with moving contact are fixed with an end of two resistive bands respectively, the other end of two resistive bands is separately fixed on the insulation board, and each is electrically connected with a binding post, it is characterized in that, described two contacts [15] respectively are fixed on the metal arm [6], two metal arms [6] are fixed on the both sides of same insulation link [4], insulation link [4] is fixed with the other end of bimetal disk [11], and two metal arms [6] each with a binding post [a], [c] is electrically connected, the top of bimetal disk [11] is provided with a resistive band [13] at interval, the two ends of this resistive band [13] each with a binding post [b], [b '] is electrically connected.

2. fire-proof motor explosion-proof motor according to claim 1 is characterized in that, the fixed form between said metal arm [6] and the insulation link [4] is that metal arm [6] is embedded on the insulation link [4]; Be that screw, nut are connected and fixed between said insulation link [4] and the bimetal disk [11], and insulation link [4] respectively is provided with insulation spacer [10] up and down; Be connected for metal flexible cord [7] between two metal arms [6] and binding post [a], [c].

3. fire-proof motor explosion-proof motor according to claim 2 is characterized in that, the outer porcelain tube [8] that is set with of said metal flexible cord [7].

4. fire-proof motor explosion-proof motor according to claim 1 and 2 is characterized in that, said two resistive bands [2] are respectively fixing with a metallic heat radiating plate [5] with the end that fixed contact [3] is fixed, and an end of metallic heat radiating plate [5] and insulation board [1] are fixing.

5. fire-proof motor explosion-proof motor according to claim 1 and 2 is characterized in that, the set resistive band [13] in said bimetal disk [11] top is fixed on the insulation supporting plate [12], and insulation supporting plate [12] is connected and fixed with insulation board [1].