CN201167074Y

CN201167074Y - Safety protection switch for preventing current overload

Info

Publication number: CN201167074Y
Application number: CNU2008200835608U
Authority: CN
Inventors: 周国森
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-02-27
Filing date: 2008-02-27
Publication date: 2008-12-17
Anticipated expiration: 2018-02-27

Abstract

The utility model relates to an anti-current overloading safety protection switch, which is improved on basis of a shell body, a switching button, a bimetal strip, an elastic strip, a driving block, a transverse pin and an L-shaped connecting rod, etc. in the prior art, namely the driving block and the transverse pin are made into an integral element, and the surface of the transverse pin is designed into an unequal diameter structure, so as to form a limiting part for propping the side surfaces at the upper end of the L-shaped connecting rod. By adopting the structure, an error between the driving block and the transverse pin can be eliminated completely, and an additional stopping block is not required to be arranged, namely the driving block, the L-shaped connecting rod and the switching button can be pivoted into a whole conveniently and rapidly; therefore, not only the assembly precision and the positioning accuracy can be enhanced, the stability of the switching button is finally ensured, but also the structure is simpler, and the device is favorable for being rapidly assembled. At the same time, through a positioning slot arranged on the inner wall of the shell body, the other end of a jump spring is directly propped against the bottom plane of the positioning slot, and the stress of the jump spring is no longer influenced by an insertion piece, thereby ensuring the horizontal stress direction of the jump spring, so as to improve the tripping precision and sensibility of the safety protection switch under current overload.

Description

A kind of safety protection switch for preventing over-current

Technical field

The utility model relates to a kind of mains switch, specifically refers to a kind of safety protection switch for preventing over-current of miniaturization hand-reset.

Background technology

At present; mains switch all is installed in the supply socket of electrical appliance; this mains switch has the employing regular tap; overload protection arrangement is equipped with simultaneously; perhaps adopt safety protection switch with preventing over-current; as Chinese invention patent number is a kind of switch 02136265.3 " anti-overflow overload protection switch " discloses; this safety protection switch includes the hollow housing of being with switch bar; housing one side elevation is to be detachable connection with housing; be fixed with first on the base plate of housing; second; the 3rd binding post; the conduction bimetal leaf that one horizontal arrangement is arranged in the lower housing portion inner chamber; its end is connected with the 3rd binding post; its another termination is a free end; on this free termination, be provided with conductive contact; the mutual formation in platinum contact on this conductive contact and second binding post can be opened the conductive path switch contact that can close; the free end of above-mentioned bimetal leaf passes through conductive contact; the insulation drive block; the pivot that L type bar and switch bar one end form props up to connect and forms a switch power transmission mechanism; have one to include the transition spring at the middle part of housing inner chamber; the mechanical double stable state spring positioning device of insulation drive block; the upper end of drive block and L type bar is by a lateral pin cross-under; forming pivot with a stomidium of described switch bar props up and is connected; thereby form the link gear of a transmission power; one end of one U type double end pin provides pivot to prop up for the insulation drive block; the other end inserts in the cavity that is opened on the housing one side elevation inwall; described cavity is cut mutually to complete a business transaction out with a tapered plane by a baseplane and forms, and an end patchhole of U type double end pin is located on the side wall of described cavity.After adopting said structure, make the bimetal leaf take-off speed of this safety protection switch fast, highly sensitive, guaranteed the break performance of switch effectively.

But find in above-mentioned switch manufacturing and use: (1) is because insulation drive block and lateral pin adopt split-type structural, in order to satisfy the assembling needs, generally between insulation drive block and the lateral pin, reserve certain clearance between lateral pin and the switch bar, can can cause the gap error accumulation like this, influence insulation drive block is the accuracy of stroke up and down, finally make switch under closure state, the poor stability of switch bar and influence the break performance of switch; Secondly, it is spacing to need the employing block to separate mutually between insulation drive block and the L type bar, makes structure complicated; Moreover such branch body structure also exists the defective that inconvenience is installed.(2) because above-mentioned transition spring one end is to be positioned on the inner walls by plug connector, between plug connector and the housing is that inserting is connected, thereby between also exists the gap, this gap is after spring generation transition, cause plug connector that the holding power of spring is up or down state, promptly be difficult to the sensing of maintenance level, thereby influence the active force of spring, further influence the take-off performance of bimetal leaf.And the plug connector of setting up has the cost height equally, and the drawback of inconvenience is installed.(3) be under the short-circuit condition when circuit, the electric arc that produces during the bimetal leaf take-off in the switch can break through outer spray after the switch bar, therefore awaits to improve, to meet relevant safety standard.

Summary of the invention

First technical problem to be solved in the utility model is at the prior art present situation, provide a kind of rational in infrastructure, be easy to make and safety protection switch for preventing over-current that operational stability is good.

Another technical problem to be solved in the utility model is at the prior art present situation, and the take-off sensitivity that a kind of bimetal leaf is provided is good and improve the safety protection switch for preventing over-current of switch electric property.

The utility model solves the problems of the technologies described above the technical scheme that is adopted: this safety protection switch for preventing over-current comprises that pivot props up the switch bar and first, second, third pin that is positioned on the housing base plate on housing top, horizontal arrangement has a bimetal leaf in the inner chamber of housing, one end of this bimetal leaf is connected with the 3rd pin, its other end is a free end, on the free end of described bimetal leaf, be provided with armature contact, to touch the fixed contact that is positioned on second pin; In described housing cavity, also be provided with mechanical double stable state spring positioning device, this bistable spring detent mechanism comprises drive block that is positioned on the bimetal leaf and the transition spring that links with drive block, on the inner walls adjacent, have and cut the cavity of completing a business transaction mutually by baseplane and tapered plane with described drive block, one pin pin of one U type double end pin inserts in the pin-and-hole of this drive block to form movable pivot point, the jack that its another pin pin is arranged in described cavity and inserts this cavity side walls is to form static pivot point, and in the housing inner chamber, also be provided with a L type connecting rod, the upper end of above-mentioned drive block and this L type connecting rod is articulated by an end of a lateral pin and switch bar, the below bending part of this L type connecting rod is under described bimetal leaf free end, it is characterized in that: described drive block and lateral pin are made integral piece, and described lateral pin surface design becomes not wait gauge structure, to form the limiting section that the described L type small end of confession portion side offsets.

As further improvement of the utility model, on described inner walls, can be provided with the bottom and be the location notch on plane, described transition spring one end is butted on the described drive block, the other end inserts in the above-mentioned location notch.

Comparatively practical is that the external diameter at lateral pin two ends can be realized assembling fast and location like this less than the external diameter at lateral pin middle part.

In above-mentioned each scheme, the first electric arc baffle plate can also be installed on the inner walls under the described cavity, and touch under the state of fixed contact when the armature contact of bimetal leaf, the first electric arc baffle plate is corresponding to the free end top of this bimetal leaf.In order to bear higher electric current, also preferred design has the second electric arc baffle plate on the inner walls on the cavity, and when the armature contact of bimetal leaf touches under the state of fixed contact, the second electric arc baffle plate is just in time inconsistent with switch bar.Simultaneously between adjacent pin, lead the arc through hole having the boundary on the housing base plate.When so in a single day being short-circuited, the electric arc of generation can spray from lead the arc through hole under the effect of above-mentioned two electric arc baffle plates, thereby more effectively prevents the phenomenon of electric arc from the front ejection.

Compared with prior art, because the utility model is made integral piece with drive block and lateral pin, and on lateral pin, be shaped on limiting section, thereby eliminated error between drive block and the lateral pin fully, and also need not to establish in addition block, can easily and quickly drive block, L type connecting rod and switch bar pivot be propped up and be integral, so both can improve the accuracy of assembly precision and location, finally guarantee the stability of switch bar, make structure simpler again, help quick assembling.Secondly, plane by means of location notch and bottom thereof, make the other end base plane direct and this location notch of transition spring inconsistent, make the stressed influence that no longer is subjected to former plug connector of transition spring, the level that has guaranteed the transition spring is subjected to force direction, with escape precision and the sensitivity of raising the utility model under current overload, and structure is simpler, is convenient to make.

Description of drawings

Fig. 1 is the structural representation (open housing one side after) of the utility model embodiment under off-state;

Fig. 2 is the perspective exploded view of Fig. 1;

Fig. 3 is the other direction schematic perspective view of Fig. 2 middle shell;

Fig. 4 is the structural representation of the utility model embodiment under conducting state.

Embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

As shown in Figure 1 to Figure 3; this protection switch comprises the hollow housing 1 that is long cube shaped, the switch bar 2 that is positioned at housing top and first pin 3, second pin 4, the 3rd pin 5; wherein; the end face of housing 1 is open type; one side 11 of housing is shirked with housing 1 by usual manners such as pin or buckles and is connected; and on the inwall of this side, be provided with the positive stop strip 12 of locating for switch bar 2, see also Fig. 1.

Above-mentioned switch bar 2 is placed in the unlimited position of housing 1 end face, and it articulates by bearing pin and housing.

Above-mentioned first pin 3, second pin 4 and the 3rd pin 5 are positioned on the base plate of housing, and the 3rd pin 5 is connected with the bimetal leaf 6 that extends to second pin 4, the free end of bimetal leaf 6 is provided with armature contact, is positioned at the fixed contact on second pin 4 and forms the loop to touch.

In the cavity of housing 1, also be provided with simultaneously mechanical double stable state spring positioning device, this bistable spring detent mechanism comprises drive block 8 and the transition spring 7 that is positioned on bimetal leaf 6 free ends, wherein, the top one of drive block 8 is shaped on lateral pin 81, the lateral pin surface design becomes not wait gauge structure, forming a limiting section 82, and the facade of drive block be provided with to horizontal direction outstanding be inserted in plush copper in place 83 for transition spring 7.Above-mentioned transition spring 7 is positioned at the top of bimetal leaf 6, and roughly parallel with bimetal leaf 6, the one end is butted on above-mentioned drive block 8 plush coppers 83, the pairing inner walls of the other end is provided with location notch 13, see also Fig. 3, this location notch 13 is roughly c-shaped, and the bottom is the plane, and be distributed with the first projection 19a successively on the inner walls around the location notch, the second projection 19b, the 3rd projection 19c and the 4th projection 19d that is positioned on the side 11, under the co of these four projections, the other end of transition spring 7 stably is inserted in the above-mentioned location notch 13, make the base plane of the other end of transition spring 7 and location notch 13 inconsistent like this, making this base plane is a plane of constraint.

On the inner walls adjacent, have and cut the cavity of completing a business transaction 14 mutually by baseplane and tapered plane with above-mentioned drive block 8, one pin pin of one U type double end pin 9 inserts in the pin-and-hole of this drive block 8 forming movable pivot point, and the jack that its another pin pin is arranged in above-mentioned cavity 14 and inserts these cavity 14 sidewalls is to form static pivot point.And in the housing inner chamber, also be provided with a L type connecting rod 10, the upper end of this L type connecting rod 10 is provided with pin-and-hole, pin-and-hole is installed in the lateral pin 81 on drive block 8 tops, and a side of L type connecting rod is tight against mutually with limiting section 82 on the lateral pin, so that L type connecting rod and drive block keep certain interval.For the ease of with lateral pin 81 assembling and positioning on switch bar 2, here, the two ends external diameter of lateral pin 81 is all less than the external diameter in the middle part of the lateral pin, to form step, during assembling, can form a pivot point as long as the end of lateral pin 81 directly is inserted in the stomidium 21 on the switch bar 2.And the below bending part of L type connecting rod 10 can prevent to be returned to original position after the bimetal leaf 6 free end take-offs under the free end of above-mentioned bimetal leaf 6, makes protection switch maintain the state that circuit disconnects after take-off.

When circuit is short-circuited, the electric arc that is produced during in order to ensure the bimetal leaf take-off does not fly out from switch bar 2, in the present embodiment, the first electric arc baffle plate 20 is installed on the inner walls under the cavity 14, and on the inner walls on the cavity, be provided with the second electric arc baffle plate 15, wherein, the first electric arc baffle plate 20 adopts metal material, it partly is embedded in the groove 16 of inner walls, and when the armature contact of above-mentioned bimetal leaf 6 touches under the state of fixed contact, the exposed parts of this first electric arc baffle plate 20 sees also Fig. 4 corresponding to the free end top of this bimetal leaf.The above-mentioned second electric arc baffle plate 15 is made into integration by housing, and when the armature contact of bimetal leaf touches under the state of fixed contact, the second electric arc baffle plate 15 is just in time inconsistent with described switch bar.Simultaneously between adjacent pin, lead arc through hole 17 having the boundary on the housing base plate.If in use, in a single day circuit is short-circuited, and under the effect of two electric arc baffle plates, electric arc can spray from lead arc through hole 17, does not hit human body or the danger of the inflammable thing of igniting so positive the wound can not be taken place.

For U type double end pin 9 is tightly inserted in the jack of drive block 8 and cavity 14, on the inwall of housing side 11, also be provided with the limited post 18 that back up is provided for it.In order in time to clearly illustrate the on off operating mode of switch, on described housing side, also be provided with indicator light 30 simultaneously, see also Fig. 1.

Cause bimetal leaf 6 adstante febres when load is excessive, this bimetal leaf 6 begins to produce distortion, make its free end produce upward and take-off, the dynamic action that upwards beat this moment is on the bottom of drive block 8, cause drive block 8 with the base length of U type double end pin 9 as moving radius, make drive block 8 with housing cavity volume inwall friction free state under rotate around static pivot point, with switch bar 2 one ends of transmission of power, make switch bar 2 one ends move upward to housing 1 end face; Simultaneously in drive block 8 makes progress rotating process, driving transition spring 7 one ends moves upward, make transition spring 7 cross the critical point position and transition takes place, force drive block 8 more upwards to rotate, realize extremely short, clear-cut switch motion transit time, meanwhile armature contact on bimetal leaf 6 free ends and the fixed contact on second pin break away from mutually, make the loop be in dissengaged positions, as shown in Figure 1.And under the state after the disconnection, since the kink of L type connecting rod 10 be inserted in bimetal leaf 6 below, the free end that it plays bimetal leaf 6 at this moment in last lift to jump locationally keep effect, may knock-on downwards to contacting the phenomenon of conducting again because of distortion in order to avoid bimetal leaf 6 occurs with fixed contact.

When manually pressing switch bar 2 it resetted downwards; switch bar 2 promotes drive block 8 by pivot point and moves down; and drive block 8 is rotated around static pivot point; an end that drives corresponding transition spring 7 rotates; transition when crossing the critical point position, transition spring 7 takes place; drive block 8 is apace to the free end of lower compression bimetal leaf 6; make the armature contact on it return to the state that contacts conducting with the fixed contact combination; and be stabilized in there; at this moment; protection switch makes the loop keep the state of connecting again, sees also Fig. 4.

Claims

1, a kind of safety protection switch for preventing over-current, it comprises that pivot props up in the switch bar (2) on housing (1) top and is positioned at first, second, third pin (3,4,5) on the housing base plate, horizontal arrangement has a bimetal leaf (6) in the inner chamber of housing, one end of this bimetal leaf is connected with the 3rd pin (5), its other end is a free end, on the free end of described bimetal leaf (6), be provided with armature contact, to touch the fixed contact that is positioned on second pin (4); In described housing cavity, also be provided with mechanical double stable state spring positioning device, this bistable spring detent mechanism comprises drive block (8) that is positioned on the bimetal leaf and the transition spring (7) that links with drive block, on the inner walls adjacent, have by baseplane and tapered plane and cut the cavity of completing a business transaction (14) mutually with described drive block, one pin pin of one U type double end pin (9) inserts in the pin-and-hole of this drive block (8) to form movable pivot point, the jack that its another pin pin is arranged in described cavity (14) and inserts this cavity side walls is to form static pivot point, and in the housing inner chamber, also be provided with a L type connecting rod (10), the upper end of above-mentioned drive block (8) and this L type connecting rod (10) is articulated by the end of a lateral pin (81) with switch bar, the below bending part of this L type connecting rod (10) is under described bimetal leaf (6) free end, it is characterized in that: described drive block (8) and lateral pin (81) are made integral piece, and described lateral pin (81) surface design becomes not wait gauge structure, to form a limiting section (82) that offsets for described L type connecting rod (10) side, upper end.

2, safety protection switch for preventing over-current according to claim 1; it is characterized in that: described inner walls is provided with the bottom and is that the location notch on plane (13), described transition spring (7) one ends are butted on the described drive block (8), the other end inserts in the above-mentioned location notch (13).

3, safety protection switch for preventing over-current according to claim 1 is characterized in that: the two ends external diameter of described lateral pin (81) is all less than the external diameter in the middle part of the lateral pin.

4, according to claim 1 or 2 or 3 described safety protection switch for preventing over-current; it is characterized in that: the first electric arc baffle plate (20) is installed on the inner walls under the described cavity; and the armature contact of working as described bimetal leaf (6) touches under the state of fixed contact, and the described first electric arc baffle plate (20) is corresponding to the free end top of this bimetal leaf (6).

5, safety protection switch for preventing over-current according to claim 4; it is characterized in that: on the inner walls on the described cavity, be provided with the second electric arc baffle plate (15); when the armature contact of described bimetal leaf (6) touches under the state of fixed contact, the described second electric arc baffle plate (15) is just in time inconsistent with described switch bar (2).

6, safety protection switch for preventing over-current according to claim 5 is characterized in that: have the boundary on described housing (1) base plate and lead arc through hole (17) between adjacent pin.