CN201233852Y

CN201233852Y - Novel overload protection switch

Info

Publication number: CN201233852Y
Application number: CNU2008200505947U
Authority: CN
Inventors: 黄政发
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-07-11
Filing date: 2008-07-11
Publication date: 2009-05-06
Anticipated expiration: 2018-07-11

Abstract

The utility model discloses a novel overload protection switch, which comprises a housing and a button matched and connected with the housing. A clamp slot for accommodating a connecting terminal and a bimetallic strip is arranged in the housing; a push block and a draw hook hinged with the push block and buckled with the bimetallic strip are arranged at one end part of the button; the overload protection switch further comprises an elastic interference piece for interfering with the rotation of the button; and both ends of the elastic interference piece are respectively hinged and matched with the button and the housing. Compared with the prior art, the utility model prevents the bimetallic strip from automatically electrify a circuit under the low temperature condition through adding the elastic interference piece, performs the cyclic jumping function through reserving a proper clearance between the push block of the button and the bimetallic strip. Furthermore, the utility model has the advantages of simple structure, convenient assembly, strong low temperature resistance, safety and reliability, effectively achieves the purpose of overload protection, and is particularly suitable for popularization during the life and work processes.

Description

Novel overcurrent protection switch

Technical field

The utility model relates to a kind of protection switch, belongs to the electric elements apparatus field, especially a kind of novel overcurrent protection switch.

Background technology

At present, along with improving constantly of safety utilization of electric power consciousness, rationally the circuit design of science becomes more and more important.However, still often current overload taking place in the life, the course of work of reality and the circuit that causes damages or fire takes place, cause serious property loss and casualties, therefore, circuit and electrical equipment is implemented overload protection be very important.

The operation principle of existing overcurrent protection switch is: during current overload, overload current causes bimetal leaf heating distortion to produce kick by the bimetal leaf of coefficient of thermal expansion differences is arranged, and the moving contact that drives on the bimetal leaf leaves fixed contact, thus open circuit.China Patent No. is 01269693.5; the utility model patent that name is called " anti-short circuit push-button switch " discloses a kind of protection switch; it is mainly by body; body cap and button are formed; be provided with binding post in the body; bimetal leaf; components and parts such as resistor and neon lamp; button is provided with pushing block and pull bar; when overload current takes place when; bimetal leaf heating distortion kick; thereby promote the button pushing block and rotate the cut-out circuit; the electric arc that instantaneous large-current is taken place is also discharged by resistor and neon lamp buffering simultaneously; reach the assurance security purpose, also can realize carrying or breaking current by switching push button.

Above-mentioned anti-short circuit push-button switch structure is simple, be easy to assembling, the scope of application is wider, but, but there is following shortcoming: first, the bimetallic sector-meeting turning circuit that automatically resets under the cryogenic conditions, because bimetal leaf has the characteristic of expanding with heat and contract with cold, served as the out-of-date distortion kick of can generating heat of live circulation, cut off circuit, and under the low temperature environment, for example subzero 10 degree during the left and right sides bimetal leaf catch a cold and shrink the moving contact that drives on it and contact with fixed contact, thereby automatic turning circuit causes the non-circuit turn-on of thinking under the wish situation, there are big potential safety hazard, especially this type of accident of northern area easier generation in winter; Second; do not possess circulation escape function; so-called circulation escape function be meant overload current takes place and button when being in loaded state (being that button can't rotate switchings) protection switch be in a kind of actuation cycle state of cut-out circuit and turning circuit; because life in reality; in the course of work; probably be stacked with foreign material or artificial careless factor around the protection switch and push down shift knob; causing can't switching push button; when overload current takes place when; if do not possess circulation escape function; just can't cut off circuit and reach the overload protection purpose; thereby cause electrical equipment damage meeting fire to take place, cause any property loss and casualties.

The utility model content

The purpose of this utility model is to overcome shortcoming of the prior art with not enough, and a kind of simple in structure, novel overcurrent protection switch that low temperature tolerance ability is strong, safe and reliable is provided.

To achieve these goals, the utility model is realized by following technical scheme:

A kind of novel overcurrent protection switch, the button that comprises housing and be connected with housing is provided with the clip slot that holds binding post and bimetal leaf in the described housing, button one end be provided with pushing block and with pushing block hinged and with the drag hook of bimetal leaf buckle; Also comprise an elasticity interference piece of interfering button to rotate, the two ends of described elasticity interference piece are respectively with button with housing is hinged cooperates.

Further, described elasticity interference piece is that one " M " type is interfered spring, the one pin of interference spring and hinged cooperation of button the other end with respect to pushing block, and another pin cooperates with housing is hinged.

Further, described button pushing block leaves appropriate gap when the conducting of button nature and between the bimetal leaf.

Further, be provided with supporting lug below the described bimetal leaf.

Further, described housing comprises first housing and second housing, and first, second housing forms one by ultrasonic fusing.

The utility model compared with prior art; prevent bimetal leaf automatic turning circuit under cryogenic conditions by setting up an elasticity interference piece; and by between button pushing block and bimetal leaf, keeping appropriate gap realization circulation escape function; overall structure is simple; easy to assembly, low temperature tolerance ability is strong, and is safe and reliable; effectively reach the purpose of overload protection, be particularly suitable for promoting the use of in life, the course of work.

In order to understand the utility model more clearly, set forth embodiment of the present utility model below with reference to description of drawings.

Description of drawings

Fig. 1 is a stereogram of the present utility model.

Fig. 2 is a structure explosive view of the present utility model.

Fig. 3 is the structural representation of the utility model turning circuit.

Fig. 4 is the structural representation that the utility model cuts off circuit.

Fig. 5 is the structural representation of the utility model circulation escape.

Embodiment

As shown in Figure 1, 2, novel overcurrent protection switch described in the utility model comprises that housing 1 reaches and the hinged button that cooperates 2 of housing.

Above-mentioned housing 1 comprises first housing 11 and second housing 12, and first, second housing 11,12 forms one by the ultrasonic technique welding; And be provided with the clip slot that several hold parts such as first, second binding post 31,32 and bimetal leaf 4 in the housing 1.Described first binding post 31 is provided with fixed contact, and second binding post 32 is fixedlyed connected with bimetal leaf 4 one ends, and bimetal leaf 4 other ends are provided with moving contact and its below and are provided with supporting lug 41, and moving contact and fixed contact are against contacting turning circuit.Described button 2 middle parts are provided with pivot 21, be located at housing 1 on 13 hinged cooperations of patchhole, turn knob 2 can realize that button switches; And button 2 one ends be provided with pushing block 22, one drag hooks 23 and pushing block 22 hinged cooperate and with bimetal leaf 4 buckles.

Above-mentioned protection switch also is provided with an elasticity interference piece of interfering button to rotate, and this elasticity interference piece is that one " M " type is interfered spring 5, two pins of interfering spring 5 respectively with respect to button the other end of pushing block with housing is hinged cooperates.On the other hand, when button 2 is in the nature conducting state, leave appropriate gap (as shown in Figure 3) between pushing block 22 lower ends and the bimetal leaf 4, be preferably 0.5～0.7mm.

Operation principle of the present utility model is as described below:

As shown in Figure 3, turn knob 2 makes button be in reset mode, and moving contact and fixed contact are against contacting, and circuit turn-on interferes 5 pairs of buttons of spring 2 to produce moments counterclockwise this moment.

As shown in Figure 4, when overload current took place, overload current conducted on the bimetal leaf 4 with certain resistance value, because electric current has thermal effect, bimetal leaf 4 heating distortion produce kick, cut off circuit thereby cause moving contact to leave fixed contact; After bimetal leaf 4 is upwards swung a bit of distance (about 0.5-0.7mm), movement velocity reaches maximum and clashes into button pushing block 22, button 2 is produced a clockwise moment, simultaneously since supporting lug 41 provide support for bimetal leaf 4, so bimetal leaf 4 can produce enough big clockwise moment and go to overcome the counter clockwise direction moment of interfering 5 pairs of buttons of spring 2 to produce, this moment, button 2 clockwise rotated, interfere spring 5 also to rotate thereupon, interfere the arm of force of 5 pairs of buttons 2 of spring to begin to reduce by maximum, counter clockwise direction moment to button 2 is also begun to reduce by maximum, after button 2 clockwise rotates certain angle, interfere the arm of force of 5 pairs of buttons 2 of spring to be kept to zero, the counter clockwise direction moment that button 2 is produced also is reduced to zero; Button 2 continues to clockwise rotate after interfering spring 5 to turn over the motion flex point, interfere 5 pairs of buttons 2 of spring to begin to produce clockwise moment this moment, and this clockwise moment increases gradually along with the increase of button 2 rotational angles, button 2 stops operating when button 2 clockwise rotates to the spacing place of housing, moving contact was then finished with fixed contact and was separated this moment, cut off circuit and connected.And when bimetal leaf 4 temperature descend or are in low temperature environment; bimetal leaf 4 is caught a cold to shrink button 2 is produced a moment counterclockwise; but this counter clockwise direction moment is much smaller than the clockwise moment of interfering 5 pairs of buttons of spring 2 to produce; so button 2 keeps closed condition; thereby make bimetal leaf 4 remain on the escape position by button drag hook 23; avoid non-artificial the automatically reset turning circuit of protection switch under low temperature environment, overcurrent protection switch described in the utility model can use in than overall situation temperature range (as-20 ℃～+ 60 ℃).

As shown in Figure 5, improper stressed when being fixed on reset position and overload current taking place when button 2, owing to leave appropriate gap between bimetal leaf 4 and the button pushing block 22, kick can take place in bimetal leaf 4 temperature distortions equally, cause moving contact to leave fixed contact, connect thereby cut off circuit; And reduce when bimetal leaf 4 temperature, to catch a cold when shrinking, homing actions take place in bimetal leaf 4, order about moving contact and fixed contact against contacting, thus turning circuit is finished an escape and is circulated; If overload current continues to exist, then the utility model can continue the escape that circulates, thereby reaches circulation escape function, protective circuit safety.

The utility model is not limited to above-mentioned execution mode, if various changes of the present utility model or modification are not broken away from spirit and scope of the present utility model, if these are changed and modification belongs within claim of the present utility model and the equivalent technologies scope, then the utility model also is intended to comprise these changes and modification.

Claims

1, a kind of novel overcurrent protection switch; comprise housing and the button that is connected with housing; be provided with the clip slot that holds binding post and bimetal leaf in the described housing; button one end be provided with pushing block and with pushing block hinged and with the drag hook of bimetal leaf buckle; it is characterized in that: also comprise an elasticity interference piece of interfering button to rotate, the two ends of described elasticity interference piece are respectively with button with housing is hinged cooperates.

2, novel overcurrent protection switch according to claim 1; it is characterized in that: described elasticity interference piece is that one " M " type is interfered spring; the one pin of interference spring and hinged cooperation of button the other end with respect to pushing block, another pin cooperates with housing is hinged.

3, novel overcurrent protection switch according to claim 1 is characterized in that: described button pushing block leaves appropriate gap when the conducting of button nature and between the bimetal leaf.

4, novel overcurrent protection switch according to claim 1 is characterized in that: described bimetal leaf below is provided with supporting lug.

5, novel overcurrent protection switch according to claim 1 is characterized in that: described housing comprises first housing and second housing, and first, second housing forms one by ultrasonic fusing.