CN2181736Y - Low voltage transformer - Google Patents

Abstract

The utility model relates to a low-voltage transformer. The utility model is composed of an iron core, a framework, wire pack and a pack clamp. The utility model is characterized in that the utility model is provided with a safety protective circuit, the relay of the safety protective circuit is connected with a group of output terminals, a rectifier diode and a thermoswitch packed in the wire pack and the safety protective circuit are connected in series, a filtering capacitance and the safety protective circuit are connected in parallel, and one set of contacts of the relay and the input terminals of the utility model are connected in series. The utility model has the advantages of reasonable design, simple structure and reliable running, the damage and the other accidents can not caused because of overvoltage, overload or short circuit, etc., and the utility model is favorable for avoiding the economic loss.

Description

Low voltage transformer

The utility model belongs to the transformer technology scope, relates to a kind of improvement of low-tension transformer.

The low-tension transformer of prior art, generally all only cored, skeleton, line bag and bag card constitute, and during work, tend to damage because of superpressure overload or short circuit cause too high causing of temperature, not only cause economic loss, and also unforeseeable peril takes place in regular meeting.

Task of the present utility model provides a kind of low-tension transformer that has safety protective circuit, in the work, when its temperature too high; in the time of might causing damaging, cut off the electricity supply automatically, quit work; make it to be protected, to overcome the existing above-mentioned shortcoming of prior art transformer.

Task of the present utility model is to realize with following technical scheme:

It comprises iron core, skeleton, line bag and bag card; its main points are equiped with a cover safety protective circuit above it; this circuit is made up of a relay, rectifier diode, filter capacitor and thermosensitive switch elements; relay connects with one group of output; and the thermosensitive switch elements that the serial connection diode is middle with being rolled in the line bag; and connecing filter capacitor, input is connected in series one group of contact of relay.

Fig. 1, Fig. 2, Fig. 3 are respectively front view of the present utility model, end view and vertical view.

Fig. 4 is the A-A cutaway view of Fig. 3.

Fig. 5 is an electrical schematic diagram of the present utility model.

Below in conjunction with accompanying drawing the utility model is elaborated:

According to Fig. 1, Fig. 2, Fig. 3 and shown in Figure 4; transformer of the present utility model comprises iron core (3), skeleton (1), line bag (5) and bag card (2); be equiped with a cover safety protective circuit above it; (4), (6), (7), (8) are respectively relay, filter capacitor, rectifier diode and the thermosensitive switch elements of this safety protective circuit; its circuit board is fixed on the bag card (2), and thermosensitive switch elements (8) is rolled in the centre of line bag (5).

In conjunction with shown in Figure 5, the relay J of this safety protective circuit (4) connects with one group of output, and serial connection rectifier diode D(7) and thermosensitive switch elements K1(8), filter capacitor C(6 in parallel), to obtain its working power; One group of contact K2 of relay J (4) is serially connected with the input of transformer, with the control on/off, realizes safeguard protection.

During use, can be at input, with one group of contact K2 of the relay that is connected in series button switch K 3 in parallel, connect with the mains, press this button switch K 3, transformer starts, the alternating current of the one group of output output that is connected with relay J is supplied with relay J, relay J adhesive, i.e. K2 adhesive after rectifier diode D rectification, filter capacitor C filtering, the power turn-on power supply, transformer work operation; When transformer the overvoltage overload occurs or short circuit occurs, the transformer temperature raises, be elevated to the temperature that thermosensitive switch elements K1 is opened when temperature, when being the maximum temperature of transformer operate as normal, thermosensitive switch elements K1 opens, and stops to power to relay J, relay J then discharges, contact K2 opens, and cuts off the electricity supply, and transformer quits work.Temperature can not be fallen, and thermosensitive switch elements K1 can not be closed, even press the button K switch 3, transformer can not move, and promptly can not continue heating again and causes its damage, thereby make transformer obtain safeguard protection.When temperature is fallen, thermosensitive switch elements K1 auto-closing, the work of going again moves as the needs transformer, and pressing next time again, button switch K 3 gets final product.

The utility model is reasonable in design, and is simple in structure, safe and reliable to operation, can not avoid economic loss because of reasons such as overvoltage overload or short circuit cause other dangerous accidents of damaging or taking place to cause therefrom.

Claims (2)

1, a kind of low-tension transformer comprises iron core (3), skeleton (1), line bag (5) and bag card (2), it is characterized in that it is provided with a cover safety protective circuit.

2, transformer according to claim 1; it is characterized in that said safety protective circuit; it is by relay J (4), rectifier diode D(7), filter capacitor C(6) and thermosensitive switch elements K1(8) constitute; thermosensitive switch elements K1(8) is rolled in the centre of line bag (5); relay J (4) connects with one group of output; and series connection rectifier diode D(7) and thermosensitive switch elements K1(8), filter capacitor C(6 in parallel), one group of contact of relay J (4) is serially connected with the input of transformer.

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