CN203179692U - Combined current transformer - Google Patents

Abstract

A combined current transformer comprises an annular iron core, a winding coil, a plastic package shell body and an injection-molding locating casing pipe. The injection-molding locating casing pipe is composed of a base circle cable casing pipe, electricity conducting bus slots and a locating convex body, wherein the two electricity conducting bus slots are symmetrically formed in the inner hole wall of the base circle cable casing pipe. The injection-molding locating casing pipe is clamped on the inner side face of a center hole of the combined body of the annular iron core and the winding coil. The combined body of the annular iron core, the winding coil and the injection-molding locating casing pipe is wrapped by the plastic package shell body. An inner hole of the injection-molding locating casing pipe is an inductive ring core hole. The injection-molding locating casing pipe is additionally arranged so that the combined piece of the annular iron core and the winding coil can be accurately installed in a die-casting die, accurate die-casting is achieved, the defects that the coil is exposed due to deviation of the plastic package shell body is overcome, influence on product quality by human factors is eliminated, a percent of passed products reaches up to 99.9%, stability is good, production efficiency is high, and economic benefits are significant.

Description

The combined electrical current transformer

Technical field:

The utility model relates to a kind of current transformer, relates in particular to a kind of low-pressure injection molding current transformer.

Background technology:

Current/voltage is big and small in the circuit of power consumption differs greatly from several peaces to several Wan An, test for ease of the technical parameter to electrical network, the used threshold currents of used measuring instrument is less electric current, therefore the big current conversion with electrical network is the electric current of appointment, otherwise just be difficult to monitoring, voltage on the high-voltage fence circuit is all than higher in addition, and it is breakneck directly measuring.Current transformer is exactly the electrical product that big electric current can be become little electric current, and it can carry out the transition to high-voltage fence detecting instrument and convert the power supply that can normally use to.Because the instrument major part of electrical network detection at present is the current voltmeter of pointer-type, so the secondary current great majority of current transformer are the ampere levels.The major function of current transformer is that high voltage or big electric current scaling transformation are become standard low-voltage or normalized current, in order to realize standardization, the miniaturization of measuring instrument, protection equipment and automatic control equipment.Instrument transformer can also be used to separating high-voltage system simultaneously, to guarantee the safety of the person and equipment.

Existing low-pressure injection molding current transformer, comprise annular core, winding coil, three plastic packaging positioning strips and plastic packaging housing, winding coil is wrapped on the annular core, three plastic packaging positioning strips are arranged on the centre bore medial surface of winding coil and annular core combination equably, and be connected as a single entity with the plastic packaging housing, annular core and winding coil are coated in the plastic packaging housing, are formed for the conductive bus bar of tested electrical network or the instrument transformer core opening that lead passes; When injection moulding coats, be coated on equably on the annular core that is wound with winding coil in order to ensure the plastic packaging housing, prevent that the skew of plastic packaging housing from producing envelope partially, stop the coil open discontinuity, three plastic packaging positioning strips must be arranged on the centre bore medial surface of winding coil and annular core combination equably, yet in actual production process, this specification requirement to the operator is very high, human factor is quite big to the influence of product quality, a die casting qualification rate of product is not high, and poor stability, comprehensive die casting qualification rate only is 75%～80%, simultaneously, even a die casting is qualified, there is not eccentric defective in the plastic packaging housing, three plastic packaging positioning strips and plastic packaging housing still exist die casting overlap and difference of height in the junction, must carry out manual removal and reparation, otherwise not only influence the presentation quality of product, and influencing the practical effect of product, the client can not accept.Yet craft is removed the die casting overlap with the trimming cutter and is carried out the reparation of filing convex body with file and both required great effort, and time-consuming again, production efficiency is low, and per tour output capacity only is about 120, the production cost height.This is the technical problem that is difficult to overcome in the plastic sealed instrument transformer production, has both influenced the stability of product quality, influences production efficiency again, is to cause the key technical problem that product percent of pass is low, production cost is high.In order to solve this technical barrier, applicant's utility model a kind of combined electrical current transformer.

The utility model content:

The purpose of this utility model provides a kind of combined electrical current transformer, and it can overcome the deficiencies in the prior art, a die casting qualification rate height.

The technical scheme that the utility model adopts is:

A kind of combined electrical current transformer, comprise annular core, winding coil and plastic packaging housing, winding coil is wrapped on the annular core, annular core and winding coil are coated in the plastic packaging housing, it is characterized in that: also comprise the injection moulding locating sleeve, the hollow cylinder tube that described injection moulding locating sleeve is a upper and lower opening, it is by the basic circle cable sleeve, conductive bus bar slot and location convex body are formed, two conductive bus bar slots are arranged on the basic circle cable sleeve inner hole wall symmetrically, the outside of conductive bus bar slot is the location convex body, the injection moulding locating sleeve relies on the outer surface of two location convex bodys to be installed on the centre bore medial surface of annular core and winding coil combination, annular core, the combination of winding coil and injection moulding locating sleeve all is coated in the plastic packaging housing, and the endoporus of injection moulding locating sleeve is for being used for the induction core opening that tested electrical network conductive bus bar or lead pass.

Owing to set up prefabricated injection moulding locating sleeve at the utility model, when die casting plastic packaging housing, location mandril is inserted in the endoporus of injection moulding locating sleeve, sub-assembly with annular core and winding coil is sleeved on the injection moulding locating sleeve again, the outer surface of two location convex bodys on the injection moulding locating sleeve is cooperated with the centre bore medial surface of the sub-assembly of annular core and winding coil, so just can make the sub-assembly of annular core and winding coil accurately in being installed in die casting, realize that accurate injection moulding forms the plastic packaging housing, stop the skew of plastic packaging housing and produce the winding coil open discontinuity, the injection moulding locating sleeve that this structure has been arranged, in actual plastic packaging production process as long as the sub-assembly of annular core and winding coil is sleeved on the plug in the die casting, matched moulds die casting gets final product, specification requirement to the operator is not high, eliminated the influence of human factor to product quality, a die casting qualification rate of product is up to more than 99.9%, and good stability.Because the plastic packaging housing is compression moulding in advance, precisely unify for the conductive bus bar of tested electrical network or the inductance loop heart hole dimension that lead passes, the endoporus of induction core opening is smooth smooth, improved the accuracy of manufacture and the presentation quality of product, the user highly approves, compared with prior art production efficiency height not only, per tour output capacity can reach about 360, and stable and reliable product quality, the product integrated cost descends 12%～15%, and economic benefit is very remarkable.Carry out the reparation of filing convex body owing to induction core opening behind this combined electrical current transformer die cast need not the operator with trimming cutter manual removal die casting overlap with file, so the operator produces free and relaxed.

Description of drawings:

Fig. 1 is structural representation of the present utility model;

Fig. 2 is the A-A cutaway view of Fig. 1;

Fig. 3 is the structural representation of annular core and winding coil sub-assembly;

Fig. 4 is the left view of Fig. 3;

Fig. 5 is the structural representation of injection moulding locating sleeve;

Fig. 6 is the B-B cutaway view among Fig. 5;

Among the figure, the 1-annular core; The 2-winding coil; 3-plastic packaging housing; 4-injection moulding locating sleeve; 41-basic circle cable sleeve; 42-conductive bus bar slot; 43-locatees convex body; 44-responds to core opening.

Embodiment:

Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing;

A kind of combined electrical current transformer, as Fig. 1～shown in Figure 6, comprise annular core 1, winding coil 2 and plastic packaging housing 3 and injection moulding locating sleeve 4, winding coil 2 is wrapped on the annular core 1, described injection moulding locating sleeve 4 is the hollow cylinder tube of a upper and lower opening, it is by basic circle cable sleeve 41, conductive bus bar slot 42, location convex body 43 is formed, two conductive bus bar slots 42 are arranged on basic circle cable sleeve 41 inner hole walls symmetrically, the outside of conductive bus bar slot 42 is location convex body 43, injection moulding locating sleeve 4 relies on the outer surface of two location convex bodys 43 to be installed on the centre bore medial surface of annular core 1 and winding coil 2 combinations, annular core 1, the combination of winding coil 2 and injection moulding locating sleeve 4 all is coated in the plastic packaging housing 3, and the endoporus of injection moulding locating sleeve 4 is for being used for the induction core opening 44 that tested electrical network conductive bus bar or lead pass.

Claims (1)

1. combined electrical current transformer, comprise annular core (1), winding coil (2) and plastic packaging housing (3), winding coil (2) is wrapped on the annular core (1), annular core (1) and winding coil (2) are coated in the plastic packaging housing (3), it is characterized in that: also comprise injection moulding locating sleeve (4), described injection moulding locating sleeve (4) is the hollow cylinder tube of a upper and lower opening, it is by basic circle cable sleeve (41), conductive bus bar slot (42), location convex body (43) is formed, two conductive bus bar slots (42) are arranged on basic circle cable sleeve (41) inner hole wall symmetrically, the outside of conductive bus bar slot (42) is location convex body (43), injection moulding locating sleeve (4) relies on the outer surface of two location convex bodys (43) to be installed on the centre bore medial surface of annular core (1) and winding coil (2) combination, annular core (1), the combination of winding coil (2) and injection moulding locating sleeve (4) all is coated in the plastic packaging housing (3), and the endoporus of injection moulding locating sleeve (4) is for being used for the induction core opening (44) that tested electrical network conductive bus bar or lead pass.

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