CN2429947Y

CN2429947Y - Phase-off protecting knife switch for three phase motor

Info

Publication number: CN2429947Y
Application number: CN 00235411
Authority: CN
Inventors: 张马栓
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-05-29
Filing date: 2000-05-29
Publication date: 2001-05-09
Anticipated expiration: 2010-05-29

Abstract

The utility model relates to a phase-off protecting knife switch for a three-phase motor. A lower joint of a fuse of each phase is respectively connected with a fuse separation slide plate, the slide plate is vertically slidable and is installed on a knife switch base board, a pulley mechanism is arranged under the slide plate which is respectively driven and connected with a corresponding group of elastic trigger connecting rods through a soft insulating pulling wire wound around a corresponding pulley, each trigger connecting rod triggers a rotary lifting mechanism through a T-shaped driving rod, the rotary lifting mechanism lifts the front end of a pry rod to control the opening and closing of three pairs of contacts, one contact of each pair of the contacts is connected with the slide plate, and the other contact is connected with a corresponding output wiring terminal through a wire.

Description

Three phase electric machine open phase protection knife switch

The utility model relates to a kind of circuit switch element, relates in particular to a kind of three phase electric machine open phase protection knife switch.

The function singleness of existing knife switch can only play general insulation blocking and to the overcurrent protection of general electrical equipment.For three phase electric machine, large-size machine generally must be equipped with special-purpose comprehensive protection device, and is effective, but output investment ratio is bigger; Micro-machine often only is equipped with general isolation knife switch switch, by fusible link motor is simply protected.And these measures are not enough for the protection of micro-machine, and motor often burns because of open-phase running.

The purpose of this utility model is to provide a kind of three phase electric machine open phase protection knife switch of simple in structure, cheap, reliable in action.

For achieving the above object; the technical solution of the utility model is to have adopted a kind of three phase electric machine open phase protection knife switch; the fusible link lower contact of every phase is connected with a fusing respectively and breaks away from slide plate; each fusing breaks away from slide plate and vertically is slidedly assemblied on the knife switch base plate; each slide plate below is provided with a pulley mechanism; the pulley that slide plate is all walked around corresponding pulley mechanism by a soft insulation backguy triggers the connecting rod transmission with one group of corresponding elastic force and links to each other; the triggering position that each group triggers connecting rod all turns to lift mechanism by rotary type of a "T"-shaped drive link percussion; rotary type turns to lift mechanism and lifts the keying of tail end hinge at three pairs of contacts of head end control of the ripping bar at the knife switch base plate back side; each breaks away from slide plate to contact of contact and a corresponding fusing and links to each other, and another contact links to each other with the output wiring terminal of a corresponding knife switch switch by lead.

Each fusing disengaging slide plate is slidedly assemblied on the knife switch base plate by the slideway of its both sides, have vertical slotted hole on the knife switch base plate between the slideway of fusing disengaging slide plate, described pulley mechanism is made of one in front and one in back two pulleys that rotate assembling on pulley yoke and the pulley yoke, and pulley mechanism is installed in the bottom of above-mentioned slotted hole.

Described each group elastic force triggers connecting rod and is made of the compression spring that resets that installs on slide bar in the stull that vertically is slidingly mounted on knife switch base plate back side correspondence and the slide bar.

The push rod of described "T"-shaped drive link vertically is slidedly assemblied in the stull of correspondence at the knife switch base plate back side, and its horizontal foot piece and three groups of top trigger head press fit that trigger the slide bar of connecting rods are coated with the compression spring that resets on the push rod of "T"-shaped bar.

Described rotary type lift mechanism by horizontal rotating shaft, laterally the rotating shaft middle part level that cooperates with the push rod top transmission of "T"-shaped drive link of installing backward catch and rotating shaft below the hard-wired vertical sheet that lifts constitute, laterally the rotation of the both ends of rotating shaft is assemblied in the back side of knife switch base plate.

The keying of described every pair of contact is that the guide metal that the ripping bar by correspondence lifts two contact upper press covers is realized, has folded up the compression spring between the transverse slat at the guide metal back side and rear thereof.

Be set with insulating barrier on the described ripping bar that faces mutually between two guide metals.Described fusing breaks away between slide plate and the corresponding contact by soft insulated conductor realization connection.

Break away from slide plate owing to be connected with fusing in the lower contact of each phase fusible link, slide plate is connected with the triggering connecting rod by soft insulation backguy, after wherein the fusible link of a phase caused motor phase failure running because of overcurrent fuses, the resetting compression spring on the triggering connecting rod can break away from slide plate by backguy pulling fusing thoroughly broke away from the fusible link breakpoint to lower slider.Simultaneously; the trigger head that triggers connecting rod upwards pushes the foot piece that touches "T"-shaped drive link; top rod driving rotary type by " T " drive link lifts mechanism's rotation; rotary type lifts mechanism and lifts ripping bar again and make the guide metal of two contact upper press covers of every phase start, open circuit; thereby cut off all three-phase current paths; burning of motor avoided in the open phase protection effect that realization is electronic to three-phase.The isolation of the utility model collection knife switch, overcurrent and open phase protection have application value widely.

Below in conjunction with accompanying drawing the utility model is made further explanation:

Fig. 1 is a front view of the present utility model;

Fig. 2 is the rearview of Fig. 1;

Fig. 3 is the A-A cutaway view at the negative rear portion of Fig. 2;

Fig. 4 is the B-B cutaway view of Fig. 2.

Among Fig. 1, the lower contact of the fusible link 8 of each phase is connected corresponding fusing with screw in compression and breaks away from the slide plate 7, fusing breaks away from slide plate 7 and is slidedly assemblied on the knife switch base plate 9 by the chute 6 on its both sides slideway, have vertical slotted hole on the knife switch base plate 9 at fusing disengaging slide plate 7 rears, the bottom of three vertical slotted holes is installed with former and later two

pulleys

3,10 of being installed by rotation on pulley yoke 2 and the pulley yoke respectively and constitutes.

Among Fig. 2, three groups of elastic force triggers connecting rod and constitutes by vertically being slidedly assemblied in the compression spring 12 that resets that installs on slide bar 11 in the

stull

27,29 and the slide bar 11.The bottom that the lower end of slide bar 11 is walked around two

pulleys

3,10 and fusing disengaging slide plate 7 by soft insulation backguy 5 is in transmission connection.

Among Fig. 2, the horizontal foot piece 28 of "T"-shaped drive link cooperates with three groups of vertical roof pressure transmissions of top trigger head that trigger three slide bars 11 of connecting rod.The push rod 25 of "T"-shaped drive link vertically is slidedly assemblied in the stull 24.On the push rod 25 between stull 24 and the foot piece 28, be coated with the compression spring 26 that resets.

Among Fig. 2, rotary type of the present utility model lift mechanism by horizontal rotating shaft 16, laterally the level that cooperates of the push rod 25 top roof pressure transmissions of the hard-wired "T"-shaped drive link in rotating shaft middle part backward catch 18 and rotating shaft 16 below the hard-wired vertical sheets 17 that lift constitute.Laterally the back side that is assemblied in the knife switch base plate is rotated at the two ends of rotating shaft 16 through swinging mounting.

Among Fig. 2, Fig. 3, be that example illustrates mutually with B, the C of A, B, C three-phase.Two pairs of

contacts

14,15 and 19,20 of B, C two-phase are communicated with by the

guide metal

35,34 of its top gland respectively, have folded up compression spring 32 between the back side of two guide metals and the transverse slat at its rear 23 respectively, to guarantee the conducting of B, C phase current at ordinary times.The lifting of

guide metal

35,34 on the two pairs of contacts is to be hinged by bearing pin 13 by afterbody and realizes at the ripping bar 31 at base plate 9 back sides.The top of ripping bar 31 presses at rotary type lifts lifting on the sheet 17 of mechanism, and when ripping bar was started, driving

guide metal

35,34 was that fulcrum rises from another with one of them contact in every pair of contact, cuts off circuit loop.In order to make insulation and increasing arcing distance between two guide metals that face mutually, on the ripping bar between two guide metals 31, be fixed with insulating barrier 33.

In B, the C two-phase, the two pairs of

contacts

14,15 and 19,20 14 and 20 break away from the soft insulated conductor of slide plate 7 usefulness with B, C fusing mutually respectively and link to each other, contact 15 links to each other with B, the C phase output terminals 1 of knife switch with insulated conductor respectively with 19.Connection, line and the manner of execution of two

contacts

21,22, guide metal 37, ripping bar 36 and the contact of A phase are identical with B, C.Repeat no more herein.

As shown in Figure 3, Figure 4; when the fusible link of arbitrary phase fuses; slide bar 11 promptly can drive "T"-shaped drive link under the tension and compression of the compression spring 12 that resets; the horizontal rotating shaft 16 that makes rotary type lift mechanism is rotated; one side of lifting the guide metal between two contacts that top that sheet 17 promptly can start ripping bar 31 makes each phase rises; cut off the three-phase current path, three-phase circuits such as motor are played the open phase protection effect.

Claims

1; a kind of three phase electric machine open phase protection knife switch; the fusible link lower contact that it is characterized in that every phase is connected with a fusing disengaging slide plate respectively; each fusing breaks away from slide plate and vertically is slidedly assemblied on the knife switch base plate; each slide plate below is provided with a pulley mechanism; the pulley that slide plate is all walked around corresponding pulley mechanism by a soft insulation backguy triggers the connecting rod transmission with one group of corresponding elastic force and links to each other; the triggering position that each group triggers connecting rod all turns to lift mechanism by rotary type of a "T"-shaped drive link percussion; rotary type turns to lift mechanism and lifts the keying of tail end hinge at three pairs of contacts of head end control of the ripping bar at the knife switch base plate back side; each breaks away from slide plate to contact of contact and a corresponding fusing and links to each other, and another contact links to each other with the output wiring terminal of a corresponding knife switch switch by lead.

2, knife switch according to claim 1, it is characterized in that each fusing disengaging slide plate is slidedly assemblied on the knife switch base plate by the slideway of its both sides, have vertical slotted hole on the knife switch base plate between the slideway of fusing disengaging slide plate, described pulley mechanism is made of one in front and one in back two pulleys that rotate assembling on pulley yoke and the pulley yoke, and pulley mechanism is installed in the bottom of above-mentioned slotted hole.

3, knife switch according to claim 2 is characterized in that described each group elastic force triggers connecting rod and is made of the compression spring that resets that installs on slide bar in the stull that vertically is slidingly mounted on knife switch base plate back side correspondence and the slide bar.

4, knife switch according to claim 3, the push rod that it is characterized in that described "T"-shaped drive link vertically is slidedly assemblied in the stull of correspondence at the knife switch base plate back side, its horizontal foot piece and three groups of top trigger head press fit that trigger the slide bar of connecting rod are coated with the compression spring that resets on the push rod of "T"-shaped bar.

5, knife switch according to claim 4, it is characterized in that described rotary type lift mechanism by horizontal rotating shaft, laterally the rotating shaft middle part level that cooperates with the push rod top transmission of "T"-shaped drive link of installing backward catch and rotating shaft below the hard-wired vertical sheet that lifts constitute, laterally the rotation of the both ends of rotating shaft is assemblied in the back side of knife switch base plate.

6, knife switch according to claim 5, the keying that it is characterized in that described every pair of contact are that the guide metal that the ripping bar by correspondence lifts two contact upper press covers is realized, have folded up the compression spring between the transverse slat at the guide metal back side and rear thereof.

7, knife switch according to claim 6 is characterized in that being set with insulating barrier on the described ripping bar that faces mutually between two guide metals.

8,, it is characterized in that described fusing breaks away between slide plate and the corresponding contact by soft insulated conductor realization connection according to the described knife switch of claim 7.