CN2203798Y - Low-temperature rising isolating transformer - Google Patents

Abstract

The utility model relates to an isolating transformer. The existing isolating transformer which is used in an airfield light system has the shortcoming that the covering material of the isolating transformer is blistered and split caused by too high temperature rise when the isolating transformer is in secondary open circuit. The utility model effectively overcomes the shortcoming. The utility model mainly comprises a housing, an annular iron core, a coil winding and a thermorelay. The utility model has the advantages of low temperature rise, favorable waterproofness, safety, etc.

Description

Low-temperature rising isolating transformer

The utility model relates to a kind of isolating transformer.

Isolating transformer (hereinafter to be referred as every becoming) is an equipment indispensable in the airfield light illuminator, and several are connected on mutually in the earth-free high voltage and constant current loop every becoming primary coil, and secondary coil provides safe voltage and constant current to load (bulb).When becoming the bringing onto load operation, be equivalent to power transformer every change, at this moment, temperature rise is lower, generally about 40 ℃; When becoming in secondary short circuited, because elementary being connected in the constant current loop, primary current does not change, and secondary current can not increase too big yet, and at this moment, temperature rise is about 30 ℃; When becoming in secondary open circuit operation (burning out as bulb), when in current transformer, elementary input induction reactance increases after in a disguised form for this, and voltage is elevated to original 3-4 doubly, makes every becoming iron core seriously saturatedly, and temperature raises rapidly, generally will be above 100 ℃.At present, that generally adopts on the airport all exists above-mentioned defective every becoming, in case bulb burns out, because phenomenons such as closure material foaming outside becoming, cracking take place through regular meeting in temperature rise, causes airfield light system cisco unity malfunction.

The purpose of this utility model is to provide a kind of new type low temperature liter every change, and it can overcome the too high weak point of temperature rise when becoming at secondary open circuit at present effectively, thereby guarantees that the airfield light system normally moves.

For achieving the above object, technical solution of the present utility model is that increasing is designed more rational electromagnetic performance parameter simultaneously and reduced iron loss every the area of dissipation that becomes, and reduces heating.For realizing such scheme, formation of the present utility model is: it comprises output cable joint, input cable joint, housing, insulating barrier, coil windings and ring structure iron core, coil windings is wound on the ring structure iron core, being insulated simultaneously layer again surrounds, housing is again with they sealings, also be provided with louvre in the middle of the housing, the height of ring structure iron core has reduced that 15-25 millimeter, external diameter have increased the 8-25 millimeter, internal diameter has increased the 8-20 millimeter, simultaneously the number of turn of coil windings has increased the 33-40 circle, and this is after the magnetic flux density that becomes 0.1 tesla that descended.

Secondary thermal relay also in parallel of going up of the present utility model when rising above certain value every alternating temperature, shields.

Cable joint of the present utility model adopts and patches structure, to guarantee excellent waterproofness being arranged and be electrically connected reliably.

The utility model is to strengthen area of dissipation by change iron core physical dimension to reduce magnetic flux density with the number of turn that increases coil windings, the minimizing heating.Owing to adopted this optimal design, so open circuit temperature rise of the present utility model generally about 70 ℃, has descended 30 ℃ than original, add the overheat protector effect of thermal relay, therefore, the utlity model has advantages such as temperature rise is low, the life-span long, safe and reliable.

Below in conjunction with accompanying drawing and example the utility model is done detailed explanation.

In the accompanying drawing, Fig. 1 is a front view of the present utility model;

Fig. 2 is an A-A cutaway view of the present utility model (ratio is amplified to some extent);

Fig. 3 is the electrical schematic diagram of airport constant current loop;

Fig. 4 is an electrical schematic diagram of the present utility model.

As shown in the figure, the utility model is made up of output cable joint ［ 1 ］ (twin-core), input cable joint ［ 2 ］, housing ［ 3 ］, insulating barrier ［ 4 ］, coil windings ［ 5 ］, thermal relay ［ 7 ］, ring structure iron core ［ 8 ］, copper sleeve ［ 9 ］, cable core ［ 10 ］.Coil windings ［ 5 ］ is wound on the ring structure iron core ［ 8 ］, being insulated simultaneously layer ［ 4 ］ again surrounds, thermal relay ［ 7 ］ is connected in parallel on the coil secondary ［ 14 ］, coil elementary ［ 13 ］ is connected in the high voltage and constant current circuit ［ 12 ］, with the housing ［ 3 ］ of the outer closure material cast of rubber with ring structure iron core, coil windings, insulating barrier, thermal relay, copper sleeve, one end of cable core is enclosed in together admittedly, also be provided with a louvre ［ 6 ］ in the middle of the housing ［ 3 ］, in addition, under the constant substantially situation of the total weight of ring structure iron core ［ 8 ］, increase area of dissipation by the physical dimension that changes iron core, simultaneously, by increasing the number of turn of coil windings, reduce magnetic flux density, optimize the electromagnetic performance parameter, reduce iron loss, reduce heating.As load (bulb) power is 200 watts, input, output current be 8.33 amperes every change, existing every the ring structure iron core size that becomes be: external diameter is 105 millimeters, and internal diameter is 55 millimeters, highly is 50 millimeters; The size of the utility model ring structure iron core is: external diameter is 125 millimeters, has increased by 20 millimeters, and internal diameter is 75 millimeters, has increased by 20 millimeters, highly is 32 millimeters and has reduced 18 millimeters; The existing number of turn every the primary and secondary coil windings that becomes is 67 circles and 66 circles, and the utility model is 106 circles and 103 circles, has increased by 39 circles and 37 circles, and at this moment, magnetic flux density is 1.6 teslas, reduces by 0.1 tesla than existing every becoming.

For another example, load (bulb) power is 100 watts, input, output current be 6.6 amperes every change, existing every the ring structure iron core size that becomes be: external diameter is 85 millimeters, and internal diameter is 55 millimeters, highly is 50 millimeters; Ring structure iron core size of the present utility model changes over: external diameter is 105 millimeters, has increased by 20 millimeters, and internal diameter is 65 millimeters, has increased by 10 millimeters, is 25 millimeters highly, has reduced 25 millimeters; The existing number of turn every the primary and secondary coil windings that becomes is 67 circles and 64 circles, and the utility model is 106 circles and 103 circles, has all increased by 39 circles, and at this moment, magnetic flux density is 1.6 teslas, has reduced by 0.1 tesla than existing every change.The utility model has adopted above-mentioned optimal design, has reduced the open circuit temperature rise, thereby has guaranteed the utility model under the situation of light fixture open circuit or short circuit, every becoming and airfield light system equal energy operate as normal.

The utility model is to be electrically connected with an end of cable core ［ 10 ］ by the enamelled wire joint of copper sleeve ［ 9 ］ with primary and secondary coil windings, the other end is connected electrically in again on the cable joint ［ 1,2 ］, cable joint ［ 1,2 ］ adopts and patches structure, and so both waterproof was reliable again.

This shows that the utility model has following advantage:

1, external form changes shorter garden cylindricality into, and surface area increases 800-2100mm ²(surface area that does not comprise louvre);

2, more reasonable on the electromagnetic performance parameter designing, make when becoming in open circuit operation, temperature rise is lower, generally about 70 ℃, has reduced 30-40 ℃ than existing every change.

3, installed overtemperature protection system additional, just in case affected by environment, during open circuit temperature rise overrate (80 ℃), the thermal relay action is connected, thereby avoids every becoming cause thermal damage.

4, because cable joint of the present utility model ［ 1,2 ］ has adopted the hermetic structure that patches, except that having good waterproof performance, also avoided in the constant-current circuit, cable joint has two some ground connection, and the phenomenon that light does not all work between two earth points takes place.

Claims (3)

1, a kind of low temperature rise isolating transformer, it comprises output cable joint [1], input cable joint [2], housing [3], insulating barrier [4], coil windings [5], ring structure iron core [8], coil windings are wound on the ring structure iron core, are insulated layer simultaneously again and surround, and housing is again with they sealings.It is characterized in that being provided with in the middle of the housing louvre [6], the height of ring structure iron core has reduced that 15-25 millimeter, external diameter have increased the 8-25 millimeter, internal diameter has increased the 8-20 millimeter, and the number of turn of coil windings has increased the 33-40 circle.

2, isolating transformer according to claim 1 is characterized in that a thermal relay ［ 7 ］ also in parallel is gone up in secondary ［ 14 ］ of coil.

3, isolating transformer according to claim 1 and 2 is characterized in that cable joint ［ 1,2 ］ employing patches structure.

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