CN2678116Y - Safety switch with automatic switchover for preventing current overload - Google Patents

Abstract

The utility model discloses a safety switch with automatic switchover for preventing current overload, comprising a casing, a tip bridge plate, a cut-over knob, a conductivity bimetal leaf, a first binding post, a second binding post, a third binding post, a moving contact and a breakback contact. A drag hook and a bent-up end hook are jointed in the ear punch under one end of the cut-over knob of the tip bridge plate, and the other bent-up end hook is jointed with the rolled-up foramen rotundum on the free end of the conductivity bimetal. The cut-over knob of the tip bridge plate is pressed and the circuit is closed or opened. When the current exceeds some nominal rating and the conductivity bimetal leaf is heated with overcurrent load, one end of the cut-over knob of the tip bridge plate is moved upward in the off-state by the anamorphosis and upward jumping dynamic of the conductivity bimetal leaf through transferring of the drag hook. The moving contact and the breakback contact in the off-state cuts off the return circuit to prevent the current overload. The cut-over knob of the tip bridge plate isn't reset by itself. When the problem of the current overload is solved and the device is needed to restart, the cut-over knob of the press tip bridge plate is pressed to rejoin with the moving contact and the breakback contact and the circuit is closed.

Description

Prevent current overload automatic switchover safety switch

One, technical field

The utility model relates to a kind of automatic switchover safety switch, refers in particular to a kind of current overload automatic switchover safety switch that prevents.

Two, background technology

Prevent current overload automatic switchover safety switch, generally using.When the power consumption equipment load abnormal raises, when load current surpassed a certain margin of safety, the conducting strip in the safety switch can tripping, and cut-off loop reaches the protective effect that prevents current overload.

Chinese patent once disclosed a kind of " the simple and easy switch of miniature no fuse that can switch at any time " (ZL922300682, Granted publication day: on April 28th, 1993), it comprises box body, pressure is touched switch and one group of L shaped conducting strip, pressure is touched switch by button, actuating rod, n shape spring leaf, formations such as alloy sheet, utilize the set pole in button central authorities belows make switch can before and after push and swing up and down, utilize arc seat with switch back seat below pivot company, the actuating rod that the drive bag is embedded in the arc seat moves up and down, alloy sheet one end with the actuating rod below company of wearing is swung up and down, contact point on the alloy sheet is contacted according to the swing mode, the disengaging correspondence is located at the contact point on the L shaped conducting strip in the left side, the loop is switched on or off, and n shape spring leaf induced effect bar when high temperature transships bounces and cut-off loop.

Chinese patent once disclosed a kind of " switching device shifter of protective current overload switch " (ZL972222111, Granted publication day: on March 17th, 1999), it comprises body, switch bar, lid, terminal, its main feature is that an end co-axial shafts is worn insulation actuator, connector in the switch bar, connector one side folder is established guide card one end, and the guide card band touches guide block; The insulation actuator links elastomer with having between the inner body wall of arc groove, and when causing the guide card distortion when current overload, guide card slides to the arc groove together with the insulation actuator, thus reach switch quick, locate reliable purpose.

Chinese patent also once disclosed a kind of " safety protection switch for preventing over-current " (application number: 02136265; open day: on January 22nd, 2003); comprise switch bar, housing, facade, positive stop strip, jockey, enclose frame, fulcrum, base plate, binding post, conduction bimetal leaf, connect plug connector, insulation drive block, the drive block that is characterized in insulating,

Double end pin and cavity and spring constitute a mechanical bistable state detent mechanism, have simply advantage rapidly of positioning stablity, take-off.

Three, utility model content

The purpose of this utility model is above-mentioned prior art is improved, and a kind of current overload automatic switchover safety switch that prevents is provided; During current overload, it switches fast, and the location is reliable; Hand-reset easily, assembling is simple, convenient.

For achieving the above object, the solution that the utility model is taked is: a kind of current overload automatic switchover safety switch that prevents, comprise housing, pivot props up the bridge plate switch bar, the conduction bimetal leaf, housing has end face and encloses a frame and a side opening, in end face encloses frame, lay pivot and prop up the bridge plate switch bar, the pivot fulcrum that pivot props up bridge plate switch bar both sides props up the hole with pivot in end face encloses frame and cooperates, side cover at a side opening place is removable lining with housing and is connected, first binding post, second binding post and the 3rd binding post are fixed in the corresponding screens in housing bottom surface, arrange the conduction bimetal leaf in the lower housing portion inner chamber, conduction bimetal leaf one end is fixed on first binding post, the other end is a free end, its termination has moving contact, the mutual formation of fixed contact on this moving contact and the horizontal kink of second binding post can be opened the conductive path switch contact that can close, and a drag hook one bent-up end clasp joint is in pivot props up earhole under bridge plate switch bar one end, another bent-up end clasp joint is rolled up circular hole on conduction bimetallic free end.

One back-up block is placed on the housing bottom surface in the corresponding space, and the boss on the back-up block withstands on below the conduction bimetal leaf.

One neon lamp is put into the housing chamber, and two pins of neon lamp are put into the corresponding draw-in groove in housing chamber, pin by resistor be electrically connected with the 3rd binding post, another pin is connected with second binding post.

Press pivot and prop up the bridge plate switch bar, be switched on or switched off circuit.When moving contact and fixed contact joint, electric current is at once through first binding post and second binding post, and electric current acts on the conduction bimetal leaf through the out-of-date heat energy that produces.When electric current surpasses a certain rated value; the conduction bimetal leaf the situation of crossing current load issue power that thermogenetic distortion upwards beats just the transmission by drag hook be enough to make pivot to prop up bridge plate switch bar one end to move upward and be in off-state; moving contact and fixed contact are in off-state; cut-off loop reaches the protective effect that prevents current overload.Pivot props up the bridge plate switch bar and can oneself not reset.In the time of need restarting when having solved the current overload problem, this need press pivot again and prop up the bridge plate switch bar, and moving contact and fixed contact are rejoined, and connects circuit.When connecting circuit, the neon lamp energising is bright, indicates working properly; Cut-off loop, neon lamp do not have electricity and do not work, and the current overload situation that occurred is described.

The technical program compared with prior art has following advantage:

1, owing to adopt pivot to prop up the bridge plate switch bar, and with drag hook as driving member, drag hook and pivot prop up bridge plate switch bar and conduction bimetal leaf and are connected simple and reliablely, locate reliably easy hand-reset, and assemble simple and convenient.

2, owing to adopted back-up block, increased the conduction bimetal leaf and issued the power that thermogenetic distortion is upwards beated, made switching quicker in the situation of crossing current load.

3, owing to adopted neon lamp, the operating state indication is clear and definite; Neon lamp is positioned in the housing chamber, assembles more simple and convenient.

4, dependable performance, assembly is few, and is easy to assembly, and production cost reduces, the cost performance height.

Four, description of drawings

Fig. 1 is the explosive view of present embodiment.

Fig. 2 is the internal structure schematic diagram (having removed side cover) of present embodiment.

Among the figure: 1, pivot props up the bridge plate switch bar, and 2, drag hook, 3, neon lamp, 4, back-up block, 5, spring, 6, resistor, 7, side cover, 8, housing, the 9, the 3rd binding post, 10, second binding post, 11, first binding post, 12, the conduction bimetal leaf, 13, fixed contact, 14, moving contact, 81, end face encloses frame, 82, chucking use flap, and 83, circular hole, 84, the cooperation axis hole, 101, earhole, 102, pivot fulcrum, 121, on roll up circular hole, 401, square boss, 402, boss platform, 403, cooperate cambered surface, 701, cooperate and use inserted block, 702, cooperate with inserting spool.

Five, embodiment

Below in conjunction with embodiment and accompanying drawing thereof the utility model is remake description.

Referring to Fig. 1 and Fig. 2, a kind of current overload automatic switchover safety switch that prevents, comprise housing 8, pivot props up bridge plate switch bar 1, conduction bimetal leaf 12, housing 8 has end face and encloses a frame 81 and a side opening, in end face encloses frame 81, lay pivot and prop up bridge plate switch bar 1, the pivot fulcrum 102 that pivot props up bridge plate switch bar 1 both sides props up the hole with pivot in end face encloses frame 81 and cooperates, side cover 7 at a side opening place is removable lining with housing 8 and is connected, first binding post 11, second binding post 10 and the 3rd binding post 9 are fixed in the corresponding screens in housing 8 bottom surfaces, arrange conduction bimetal leaf 12 in housing 8 lower lumen, conduction bimetal leaf 12 1 ends are fixed on first binding post 11, the other end is a free end, its termination has moving contact 14, fixed contact 13 mutual formation on this moving contact 14 and second binding post, the 10 horizontal kinks can be opened the conductive path switch contact that can close, and a drag hook 2 one bent-up end clasp joints are in pivot props up earhole 101 under bridge plate switch bar 1 one ends, another bent-up end clasp joint is volume circular hole 121 on conduction bimetallic 12 free ends.

Referring to Fig. 1 and Fig. 2, a back-up block 4 is placed on housing 8 bottom surfaces in the corresponding space, and the boss on the back-up block 8 withstands on below the conduction bimetal leaf 12.Boss on the back-up block 8 down for square boss 401, upward be boss platform 402, back-up block 8 bottom surfaces are for cooperating cambered surface 403, like this back-up block 8 cooperate with housing 8 not only simple and convenient but also very tight reliably.

Referring to Fig. 1 and Fig. 2, a neon lamp 3 is put into housing 8 chambeies, and 3 two pins of neon lamp are put into the corresponding draw-in groove in housing 8 chambeies, and a pin is connected with second binding post 10 with 9 electrical connections of the 3rd binding post, another pin by resistor 6.Because resistor 6 length relations, 3 one pin foots of neon lamp stretch in the housing 8 corresponding circular holes 83, and an end of placing spring 5 and resistor 6, the three binding posts 9 in the circular hole 83 again stretches in the circular hole 83 and contacts with resistor 6.This way of contact is not subjected to the effect length of resistor 6, and because the effect of spring 5 contacts more reliably.

Referring to Fig. 1, side cover 7 is protruding with six roots of sensation cooperation 702 and three cooperations of slotting axle inserted blocks 701, and six roots of sensation cooperation is used slotting axle 702 can shirk with axis hole 84 cooperation formation with six cooperations in housing 8 frames and combined.This combination of shirking in conjunction with firm, is shirked laborsaving convenience.

Referring to Fig. 1 and Fig. 2, housing 8 both sides have chucking with flap 82, are beneficial to switch and are stuck on the service position.

Owing to adopt technique scheme, its assembling is very simple, helps producing in enormous quantities and reducing production costs.Its assembling process is as follows: (1) fixed contact 13 (silver contact) of riveting on second binding post 10; (2) moving contact 14 (silver contact) of under conduction bimetal leaf 12 (rolled up roll up circular hole 121), riveting over; (3) rivet over conduction bimetal leaf 12 rivetings of moving contact 14 on first binding post 11; (4) neon lamp 3 is placed on installation position in the housing 8, and pin is put into corresponding draw-in groove; (5) in circular hole 83, put into spring 5, resistor 6, reinstall first binding post 9; (6) first binding posts 11, second binding post 10 are contained in the corresponding screens and compress; (7) load onto pivot and prop up bridge plate switch bar 1; (8) pivot is propped up bridge plate switch bar 1 by to low level, prop up between bridge plate switch bar 1 and the conduction bimetal leaf 12 at pivot and load onto drag hook 2, press pivot and prop up the bridge plate switch bar, the feel unanimity that swings; (9) whether the testing product technical parameter meets the requirements; (10) load onto side cover 7, whether the testing product technical parameter is qualified again.

Claims (7)

1, a kind of current overload automatic switchover safety switch that prevents, comprise housing (8), pivot props up bridge plate switch bar (1), conduction bimetal leaf (12), housing (8) has end face and encloses a frame (81) and a side opening, in end face encloses frame (81), lay pivot and prop up bridge plate switch bar (1), the pivot fulcrum (102) that pivot props up bridge plate switch bar (1) both sides props up the hole with pivot in end face encloses frame (81) and cooperates, side cover (7) at a side opening place is removable lining with housing (8) and is connected, first binding post (11), second binding post (10) and the 3rd binding post (9) are fixed in the corresponding screens in housing (8) bottom surface, arrange conduction bimetal leaf (12) in housing (8) lower lumen, conduction bimetal leaf (12) one ends are fixed on first binding post (11), the other end is a free end, its termination has moving contact (14), fixed contact (13) on this moving contact (14) and the horizontal kink of second binding post (10) formation each other can be opened the conductive path switch contact that can close, and it is characterized in that: a drag hook (2) one bent-up end clasp joints are in pivot props up earhole (101) under bridge plate switch bar (1) one end, another bent-up end clasp joint is rolled up circular hole (121) on conduction bimetallic (12) free end.

2, a kind of current overload automatic switchover safety switch that prevents according to claim 1 is characterized in that: a back-up block (4) is placed on housing (8) bottom surface in the corresponding space, and the boss on the back-up block (8) withstands on below the conduction bimetal leaf (12).

3, a kind of current overload automatic switchover safety switch that prevents according to claim 2 is characterized in that: the boss on the back-up block (8) is square boss (401), upward is boss platform (402) that back-up block (8) bottom surface is for cooperating cambered surface (403) down.

4, a kind of current overload automatic switchover safety switch that prevents according to claim 1, it is characterized in that: a neon lamp (3) is put into housing (8) chamber, (3) two pins of neon lamp are put into the corresponding draw-in groove in housing (8) chamber, and a pin is connected with second binding post (10) with the 3rd binding post (9) electrical connection, another pin by resistor (6).

5, a kind of current overload automatic switchover safety switch that prevents according to claim 4, it is characterized in that: (3) pin foots of neon lamp stretch in the corresponding circular hole (83) of housing (8), place spring (5) and resistor (6) in the circular hole (83) again, an end of the 3rd binding post (9) stretches in the circular hole (83) and contacts with resistor (6).

6, a kind of current overload automatic switchover safety switch that prevents according to claim 1, it is characterized in that: side cover (7) is protruding with six roots of sensation cooperation slotting axle (702) and three cooperation inserted blocks (701), and six roots of sensation cooperation is used slotting axle (702) can shirk with axis hole (84) cooperation formation with six cooperations in housing (8) frame and combined.

7, a kind of current overload automatic switchover safety switch that prevents according to claim 1 is characterized in that: housing (8) both sides have chucking flap (82).