CN2167441Y

CN2167441Y - Temperature control type spiral protector

Info

Publication number: CN2167441Y
Application number: CN 93214959
Authority: CN
Inventors: 陈洪普
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-06-08
Filing date: 1993-06-08
Publication date: 1994-06-01
Anticipated expiration: 2003-06-08

Abstract

A dual-function protector for motor is composed of a ceramic casing, a connecting terminal, a fuse tube, a ceramic cap with internal conductor, another connecting terminal, and a temp-control switch for indirect heating. The fuse tube is a heat source, the temperature is transmitted to the bimetallic strip through the wiring terminal, the mounting plate and the air medium, the bimetallic strip is heated to generate a 'kick' shape, the original convex shape is turned into a concave shape, the positive displacement variable and the negative displacement variable push the supporting rod, the contact is engaged and disengaged, the task of switching a circuit is achieved, the power supply can be cut off when small overcurrent occurs, the phase-failure-free and motor phase-failure-free operation is realized, the fuse tube is not consumed, and energy is saved.

Description

Temp. controlled spiral protective device

The utility model relate to a kind of reach to give putting temperature outage and reaching to give put current limit fusing, have the safeties of dual-use function, especially can flow scope in small offence, cut off the protector of three phase mains.

At present; the plug fuse of known RLIB type band open phase protection; be that patented product (patent No. 90206720.6) is the most close prior art; be that an auxiliary switch is set in the porcelain seat; little spring that Yi Bei Opinions-Pictures copper wire strains and contact and melt are set in fusion tube to be in parallel; action principle is: after the dependence melt is fused; low capacity De Opinions-Pictures copper wire fuses immediately; little spring is out of control and flick; contact is released beyond the fusion tube, backed down auxiliary switch, cut off the control power supply; but, there are four big defectives from structure and the operating principle analysis of RLIB:

1, it is the instruction of melt fusing being taken action for protection by the overcurrent of motor, for motor, is to break down earlier, and the back produces the protection action, and is day after the fair.

2, little spring is arranged in the interior hot environment of fusion tube, works continuously for a long time under 150～300 ℃, must cause annealing, follows the string, and can't release contact and separating switch.

3, routine is to select fuse-link by the motor rated current, brings new contradiction because of using RLIB, select when too small, in the fusion tube temperature rise higher, bigger to little spring harm, when selecting routinely, blowout current is excessive, easily burns motor.

4, melt is non-senser, and the fusing course of reaction is slow, stock trick art condition regulation, and when 1.6～2.1 times of overcurrents, fusing can make motor under 2.4～4 times of overcurrents, and running time is longer again in hour, and motor windings is difficult to bear, and must cause burning.

The purpose of this utility model provides a kind of temperature control of both being with; has fuse function again; heavy corkscrews protector again; temperature control point generally is located at 60% of melt electric current; 120% of motor rated current; except that the safety of more effective protection upper end electric line; and can also guarantee the safe operation of threephase motor and other power consumption equipments; can be at motor small offence stream scope internal cutting off power supply; fundamentally stop the phase failure and do not have open-phase running; avoided motor faults such as short circuit to occur simultaneously, not loss fusible core, energy-conservation.

The purpose of this utility model is achieved in that in the porcelain shell; the metal threaded one of external fixation of one end of main circuit connection terminal and porcelain seat upper surface; it is metal threaded in porcelain cap liner is fixedly connected; the fusion tube upper end cover; melt; the fusion tube bottom end cover; another binding post is to be electrically connected; in the porcelain base cavity pocket; it is a normally closed branch road that one temperature detect switch (TDS) is set; binding post; the temperature detect switch (TDS) mounting panel; bimetal leaf; porcelain promotes pole; the upper contact connecting rod is a mechanical connection; the branch road binding post; connecting line; the upper contact connecting rod; lower contact connects reed; another binding post of branch road is electrically connected; be connected on clutch for clutch control power supply in the control circuit; temperature detect switch (TDS) is an indirect heating type; thermal source is taken from melt temperature; so heater and fusion tube are same object; melt temperature and overcurrent linear relationship in direct ratio; when overcurrent is big; the melt temperature height; otherwise otherwise; fusion tube; binding post; the temperature detect switch (TDS) mounting panel; what bimetal leaf constituted the temperature detect switch (TDS) indirect leads Wen Qiao and air medium transmission; constitute compound indirect mode again; when when nominal load normally moves, electric current " I " is no more than and presets protective current extreme value, the heat that is produced; deficiency makes bimetal leaf produce needed deflection; temperature detect switch (TDS) is still kept normally off, and works as main circuit for some reason, and electric current " I " is increased; naturally its electric heating amount also increases; making needs the butterfly of radius of curvature bimetal leaf to produce " kick " shape, is turned into spill by original convex, utilizes the offset variable of positive and negative both direction to promote porcelain pole; make it to allow the contact clutch, reach the task of commutation circuit.

Owing to adopt such scheme; make Temperature Control Type fuse cutout device; except that safe operation function with protection upper end transmission line; can possess the function of the safe operation of protection motor simultaneously, stop the phase failure and intact open-phase running and can avoid motor short trouble to occur, not loss fusion tube; only in base intracavity; increase by a temperature detect switch (TDS), constitute the control branch road, simple in structure.

Further specify this reality is novel below in conjunction with drawings and Examples:

Fig. 1 is use circuit theory diagrams of the present utility model

Fig. 2 is first embodiment vertical section structure of Temperature Control Type fuse cutout device figure

Fig. 3 is the profile mansion view of Fig. 2

Fig. 4 is switch vertical section structure enlarged drawing component 4-1 and Fig. 4-2.

Among the figure 1, the porcelain seat; 2, temperature detect switch (TDS) normally-closed contact; 3, porcelain promotes pole; 4, power outlet binding post; 5, the porcelain seat tightens external screw thread; 6, porcelain cap; 7, observation window; 8, porcelain cap liner conduction connector; 9, fuse tube upper end cover; 10, fuse tube positioning reed; 11, porcelain fuse tube housing; 12, the porcelain cap is connected the metallic conduction screw thread with the porcelain seat; 13, porcelain ring; 14, fuse tube bottom end cover; 15, electric power incoming line binding post; 16, temperature detect switch (TDS) mounting panel; 17, bimetal leaf; 18, insulating support; 19, spring; 20, upper contact connecting rod; 21, lower contact connects reed.

Connect electric power incoming line at Fig. 1 middle connecting terminal (15), binding post (4) connects the load power source line, the Temperature Control Type protector is connected in the main circuit, in establish temperature detect switch (TDS) and insert mutually from power supply A, be connected in the secondary control circuit, through A.C. contactor pull-in winding (CT), start button (QA) stops to connect to be turned round (TA) and is connected with power supply C, constitute secondary control loop, when being connected on A, B, Temperature Control Type fuse cutout device in the C three-phase, wherein arbitrary when temperature detect switch (TDS) contact (2) being separated because of overcurrent, cut off the power supply of control circuit, the A.C. contactor dead electricity is threaded off and is discharged CJ _1～3Main contacts recovers often to open, and makes motor break away from electrical network and stall.

In Fig. 2, electric power incoming line binding post (15), fuse tube bottom end cover (14) fuse tube upper end cover (9), porcelain cap liner electric conductor (8) porcelain seat screw thread electric conductor (5) power outlet binding post (4) constitutes the main circuit that is electrically connected.

Binding post (15) temperature detect switch (TDS) mounting panel (16) bimetal leaf (17) constitutes the temperature transfer bridge circuit of mechanical connection, finishes the commutation circuit task by the clutch of control contact (2).

In Fig. 3, control contact binding post (22) and (23) is shown emphatically, be positioned at the vertical end of power supply turnover line binding post (15) and (4).

In Fig. 4, protruding butterfly bimetal leaf (17) promotes pole (3) with porcelain and depresses, make normally-closed contact (2) keep on-state, when reaching, temperature gives when putting extreme value, bimetal leaf (17) produces " kick " shape and is turned into spill, porcelain catch bar (3) produces to top offset by spring (19) power, and normally-closed contact (2) separates the purpose that reaches commutation circuit.

Claims

1, a kind of Temperature Control Type fuse cutout device, in the porcelain shell, the major loop binding post, metal threaded fixture, fuse tube and another binding post, order is electrically connected, it is characterized in that: temperature detect switch (TDS) places in the base cavity pocket, fuse tube, major loop binding post, the temperature detect switch (TDS) mounting panel, bimetal leaf, porcelain promotes pole, the upper contact connecting rod, sequential machine connects, the temperature detect switch (TDS) binding post, the upper contact connecting rod, the lower contact reed is electrically connected with another temperature detect switch (TDS) binding post.

2, according to the described protector of claim 1, it is characterized in that: fuse tube and heater are same objects, and metal and air medium constitute compound indirect.

3, according to the described protector of claim 1, it is characterized in that: porcelain promotes pole, is dielectric isolation layer, and temperature detect switch (TDS) does not have with major loop and is electrically connected.