CN2138835Y - Automatic switch for overload and short-circuit - Google Patents

Abstract

The utility model relates to an automatic switch for overload and short-circuit, which is composed of a base (1), an upper cover (2), an electric magnet (3), a spring contact pole (4), a fixed contact pole (5), a soft iron (6), a hinge shaft (7), a return spring (8), a locking lever (9), a resetting button (10) and an overvoltage short-circuit device (11). When the utility model is used, the power utilization load of an electric device is arranged on both output ends of the automatic switch for overload and short-circuit, which makes the electric magnet (3) connected in series in a return circuit, and the overvoltage short-circuit device is connected in parallel in the return circuit; when an over current fault, a short-circuit fault or an overvoltage fault of a circuit arises, the automatic switch for overload and short-circuit can cut off the circuit in time to protect the electric device. The utility model has the advantages of convenient operation, high reliability, simple structure, low cost, small volume and light weight, and when the circuit is in a normal state, the utility model makes no power consumption.

Description

Automatic switch for overload and short-circuit

The utility model relates to a kind of urgent electric switch of protecting the usefulness that opens circuit of overload of doing, and further is meant a kind of overload and the short circuit automatic switch that have electromagnetism release and resetted by button mechanism.

Electrical installation is transshipped and short circuit is promptly protected, and modal is to adopt fuse (safety box), but it need expend a large amount of low-melting alloy materials, and insensitive to little excess overcurrent, and in use often will change fuse (sheet) and quite do not want to take the trouble.Some occasion also has uses thermal relay, air automatic switch etc. to be used as protector; though have easy to use and the reliable advantage of protection; but exist defectives such as complex structure, price is higher, volume is big, oneself power consumption is also bigger, be difficult to generally be used for replacing general fuse.

The purpose of this utility model is to provide a kind of easy to use and protection is reliable and simple in structure and price is lower overload and short circuit automatic switch.

The solution of this automatic switch is as follows.It has a base and covers the loam cake that is connected on the base, be fixed with electromagnet in the base respectively, springing is touched the utmost point and is fixedly touched the utmost point, on touching extremely, springing is fixed with a soft iron near a distance of core ends of electromagnet, fixedly touching the bottom of the utmost point and top ends that the utmost point is touched in springing is in contact with one another, termination of the iron-core coil of electromagnet with fixedly touch the utmost point and be electrically connected, in base, also be fixed with hinge and return spring, a snap close lever slides on the hinge by the perforate on its bar, the other end of return spring contacts with the snap close lever, the bottom of snap close lever contacts with the top that the utmost point is touched in springing, on cover and have that sliding sleeve has a reset button in button hole and the hole, accept mutually with the bottom surface of reset button on the top of snap close lever, in loam cake, also be equipped with by can and two from the overvoltage short-circuiting device that constitutes of very near metal pole piece, metal pole piece end of overvoltage short-circuiting device and springing are touched the utmost point and are electrically connected.

The utility model with said structure is when concrete the use, the idle of iron-core coil of a power input and electromagnet should do not joined with end, the utmost point is touched in metal pole piece end of overvoltage short-circuiting device and springing be electrically connected end as an output that joins with external load, after another metal pole piece end of another power input and overvoltage short-circuiting device joined, as another output that joins with external load.Like this, the iron-core coil of electromagnet just is serially connected in the loop, and the overvoltage short-circuiting device just is attempted by in the loop.When the circuit normal power supply used, what power input by the iron-core coil of electromagnet, fixedly touched that the utmost point, springing touch the utmost point and external connection electrical apparatus constituted the loop with electric loading.And when traffic overload or short circuit appear in circuit; iron-core coil will have very big electric current to pass through; the high-intensity magnetic field power that electromagnet produces attracts soft iron to come; so soft iron drive springing is touched the utmost point and is overcome the pressure of snap close lever to it; make snap close lever bottom fasten springing and touch utmost point top ends, springing is simultaneously touched utmost point top ends and is fixedly touched utmost point bottom and is separated, thereby the loop disconnects; power supply stops to the electricity consumption electric, reaches the purpose of protection electrical installation.When the circuit overvoltage, be connected in parallel on the overvoltage short-circuiting device in the loop, its two metals pole piece attracts each other under the effect of highfield, circuit so short circuit, promptly the overvoltage short-circuiting device changes into over-current signal with the overvoltage signal, thereby makes electromagnet move interrupt circuit rapidly.After circuit recovers normally, only need click reset button gently, just can make springing touch the control that the utmost point breaks away from the snap close lever, recovery bounces back into and fixedly touches extremely contacted state, thereby makes the circuit connection, recovers the power supply with electric loading.

The utility model is fuse (safety box) relatively, does not have the trouble of often changing fuse (sheet), and is active in one's movements, and protection is reliable.And automatic air-break switch relatively, then the utility model is simple in structure, and is cheap, and volume is little, and is in light weight, in circuit consumed power not just often itself, can not damage long service life because of heating.It can be widely used in the safeguard protection of overload, short circuit and the overvoltage of electrical installation, particularly electrical Household appliance.

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the embodiment of a kind of concrete structure of the utility model;

Fig. 2 is Fig. 1 electrical schematic diagram of the present utility model.

Reference numeral among the above-mentioned figure is: 1, and base; 2, loam cake; 3, electromagnet; 4, the springing contact; 5, fixedly touch the utmost point; 6, soft iron; 7, hinge; 8, return spring; 9, the snap close lever; 10, reset button; 11, the overvoltage short-circuiting device; 12, utmost point hold-down screw is touched in springing; 13, the base fixing threaded hole; 14, the loam cake screw that is connected with base; 15, the adhesive layer; 16, power input; 17, output.

Referring to Fig. 1, springing touch the utmost point (4) can select for use elasticity preferably copper sheet make, it touches utmost point hold-down screw (12) with springing and is fixed on the base (1).Electromagnet (3) and overvoltage short-circuiting device (11) be fixing on base (1) and loam cake (2) respectively, all can adopt adhesive layer (15).For making things convenient for the utility model fixing in the field of employment, can on base (1), offer base fixing threaded hole (13).Being connected between loam cake (2) and the base (1), can adopt the loam cake screw (14) that is connected with base that both are linked to each other.Two metal pole pieces that fixedly touch the utmost point (5) and overvoltage short-circuiting device (11) all should be selected the metal that conducts electricity very well.

Claims (1)

1, a kind of overload and short circuit automatic switch, it is characterized in that, it has a base (1) and cover and is connected in loam cake (2) on the base (1), be fixed with electromagnet (3) in the base (1) respectively, springing is touched the utmost point (4) and is fixedly touched the utmost point (5), springing is touched and is fixed with a soft iron (6) near a distance of core ends of electromagnet (3) on the utmost point (4), fixedly touching the bottom of the utmost point (5) and top ends that the utmost point (4) is touched in springing is in contact with one another, termination of the iron-core coil of electromagnet (3) with fixedly touch the utmost point (5) and be electrically connected, in base (1), also be fixed with hinge (7) and return spring (8), a snap close lever (9) slides on the hinge (7) by the perforate on its bar, the other end of return spring (8) contacts with snap close lever (9), the bottom of snap close lever (9) contacts with the top that the utmost point (4) is touched in springing, have on the loam cake (2) that sliding sleeve has a reset button (10) in button hole and the hole, accept mutually with the bottom surface of reset button (10) on the top of snap close lever (9), in loam cake (2), also be equipped with by can and two from the overvoltage short-circuiting device (11) that constitutes of very near metal pole piece, metal pole piece end of overvoltage short-circuiting device (11) and springing are touched the utmost point (4) and are electrically connected.

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