CN210925733U

CN210925733U - Novel current transformer

Info

Publication number: CN210925733U
Application number: CN201921643095.3U
Authority: CN
Inventors: 季红雨
Original assignee: Shandong Platinum Crystal Intelligent Technology Co ltd
Current assignee: Shandong Platinum Crystal Intelligent Technology Co ltd
Priority date: 2019-09-29
Filing date: 2019-09-29
Publication date: 2020-07-03
Anticipated expiration: 2029-09-29

Abstract

The utility model relates to a novel current transformer, which comprises a shell, wherein an iron core, a primary winding, a secondary winding and a guide pin are arranged in the shell; the shell comprises a housing and a supporting framework, an accommodating cavity is arranged in the housing, and the supporting framework covers an opening of the accommodating cavity; the support framework is provided with a filling hole, the support framework is provided with a needle guide positioning seat, the needle guide positioning seat comprises a supporting seat and a positioning seat, the supporting seat is provided with a needle guide positioning hole, the positioning seat is positioned on the supporting seat or the support framework, and the positioning seat is provided with a positioning surface; the guide needle comprises a first connecting part and a second connecting part, the first connecting part is rotatably arranged in the guide needle positioning hole, and the second connecting part is connected with one end of the first connecting part, which extends into the accommodating cavity; an adjusting included angle is arranged between the first connecting part and the second connecting part; under the guidance of the positioning surface, the second connecting parts of two adjacent guide pins are staggered with each other; and the supporting framework is also provided with a coil positioning structure for fixing the coil. Reasonable structure, convenient assembly and low production cost.

Description

Novel current transformer

Technical Field

The utility model relates to a mutual-inductor technical field especially relates to novel current transformer.

Background

The current transformer principle is based on the electromagnetic induction principle, and the current transformer consists of an iron core and a winding. The primary winding of the measuring device needs to be connected in series in a line of current needing to be measured, so that the measuring device always has the whole current of the line flowing through, and the secondary winding of the measuring device is connected in series in a measuring instrument and a protection loop and provides necessary signals for the instrument and protection equipment.

As shown in fig. 1, in the existing current transformer, in the existing assembly process, a lead pin 12 is inserted into a framework 11, and then a heat insulation pipe 13 needs to be sleeved, so that a coil is prevented from being scalded in a subsequent process; after the coil is placed, the enameled wire is wound on the top of the guide pin 12, and then the wound semi-finished products are placed in a row to wait for entering a welding process. After welding, the framework 11 and the coil 14 are placed into the housing together, and finally, the insulating material is poured into the housing, so that the insulating material and the framework 11, the guide pin 12, the coil 14 and other components are integrated through the action of the insulating material.

The existing structure needs longer lead pins, firstly, the welding position needs to be ensured to be far away from the coil as far as possible, and if the lead pins are too close to the coil, the enameled wires are easily scalded by a soldering iron in the welding process or the enameled wires are directly touched due to improper operation; secondly, after the enameled wire is wound at the upper end of the guide pin, the guide pin also plays a role in pre-positioning the coil, and if the guide pin is too short, the pre-positioning effect cannot be well played; and the long guide needle can lead to large overall volume of the product and high cost. The heat shrinkable tube is sleeved outside the lead pin, so that the heat generated by a lead pin conduction soldering iron in a welding process is prevented from scalding the enameled wire outside a welding part, and the fine heat shrinkable tube is high in price and not easy to sleeve, so that the overall labor and material cost is increased. In order to improve the assembly efficiency, the welding of the lead pin and the enameled wire is not performed immediately after each winding, but is performed by winding dozens of leads and arranging the leads in a row at a time and then uniformly welding the leads, the assembly process also increases the probability of accidents, domino effect can be generated when the leads are accidentally touched, all the leads are inclined, the unwelded coil is easily separated from the framework, the reprocessing difficulty is greatly increased, even the coil is damaged, and the material and labor waste is caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a novel current transformer is provided to rational in infrastructure, convenient equipment and low in production cost.

In order to solve the technical problem, the technical scheme of the utility model is that: the novel current transformer comprises a shell, wherein a coil is arranged in the shell, the coil comprises an iron core, a primary winding and a secondary winding are wound on the iron core, and the input end and the output end of the primary winding and the input end and the output end of the secondary winding are respectively and electrically connected with a guide pin;

the housing comprises

The device comprises a housing, a first connecting piece and a second connecting piece, wherein an accommodating cavity is arranged in the housing, and an opening is formed in one end of the accommodating cavity;

and a support frame covering the opening of the accommodation chamber; the support framework is provided with a perfusion hole, the support framework is provided with a guide pin positioning seat, and the guide pin positioning seat comprises

The supporting seat is fixed on the side face, facing the accommodating cavity, of the supporting framework; a guide pin positioning hole is formed in the supporting seat and penetrates through the supporting seat and the supporting framework;

the positioning seat is fixed on the supporting seat or the supporting framework, and a positioning surface for positioning the guide pin is arranged on the positioning seat;

the guide needle comprises

The first connecting part is rotatably arranged in the guide pin positioning hole, and two ends of the first connecting part extend out of the guide pin positioning hole;

the second connecting part is connected with one end, extending into the accommodating cavity, of the first connecting part;

an adjusting included angle is arranged between the first connecting part and the second connecting part; the second connecting parts are abutted against the positioning surface, and under the guidance of the positioning surface, the second connecting parts of two adjacent guide pins are staggered with each other;

and the supporting framework is also provided with a coil positioning structure for fixing the coil.

Preferably, the coil positioning structure comprises

The lower ends of the fixed seats are fixedly connected with the supporting framework, and the upper ends of the fixed seats are provided with positioning surfaces which are matched with the outer ring surfaces of the coils;

the two supports are respectively fixed on the two positioning surfaces and are respectively arranged close to the two end surfaces of the iron core; the support is far away from the one end of locating surface is equipped with the stopper, the stopper card is in on the interior anchor ring of iron core.

As the preferred technical scheme, the pouring hole is a rectangular hole and is positioned between the two fixing seats.

As a preferred technical solution, the primary winding and the secondary winding are respectively located at two sides of the support.

As a preferred technical scheme, the iron core is annular, and the positioning surface is an inwards concave cambered surface.

Preferably, the first connection portion and the second connection portion have a circular cross section.

Preferably, the first connecting portion and the second connecting portion are integrated.

As a preferred technical scheme, the adjusting included angle is 60-120 degrees.

Due to the adoption of the technical scheme, the coil of the novel current transformer is fixed by the coil positioning structure, the guide pin is composed of the first connecting part and the second connecting part, the second connecting part is obliquely arranged relative to the supporting framework or is parallel to the supporting framework, and the height of the second connecting part is far less than the overall height of the coil, so that the influence of the length of the guide pin on the size of the shell is reduced. Meanwhile, the coil position is fixed, the guide pin can be flexibly adjusted, the guide pin is rotated during welding to enable the welding end of the guide pin to be far away from the primary winding or the secondary winding, heat generated by welding equipment cannot directly affect a lead, the distance between the guide pin and the primary winding and the distance between the guide pin and the secondary winding can be properly increased and are completely separated from the winding, heat conducted by the guide pin cannot damage the guide pin, the welding quality is reliable, and the product performance is stable. The heat in the welding process can not influence the primary winding and the secondary winding, and a heat insulation sleeve is not needed for heat insulation, so that the production process is simplified, and the production cost is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a schematic diagram of the internal structure of a prior art current transformer;

fig. 2 is a schematic structural diagram of a first view angle according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a second viewing angle according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a supporting framework and an iron core in an embodiment of the present invention;

FIG. 5 is a schematic structural view of a needle according to an embodiment of the present invention;

fig. 6 is a first view structural diagram of the supporting frame according to the embodiment of the present invention;

fig. 7 is a schematic view of a second perspective structure of the supporting frame according to the embodiment of the present invention.

Detailed Description

As shown in fig. 2, 3 and 4, the novel current transformer comprises a housing, a coil is arranged in the housing, the coil comprises an annular iron core 5, a primary winding 6 and a secondary winding 7 wound on the iron core 5, and an input end and an output end of the primary winding 6 and an input end and an output end of the secondary winding 7 are respectively electrically connected with a guide pin 3. The shell comprises a housing 2 and a supporting framework 4, an accommodating cavity is arranged in the housing 2, and an opening is formed in one end of the accommodating cavity; the support skeleton 4 covers the opening of the receiving chamber. As shown in fig. 6 and 7, the supporting frame 4 is provided with a pouring hole 48, and after the coil is assembled with the supporting frame 4 and the housing 2, an insulating material is poured into the accommodating chamber, and the components are connected into a whole through the insulating material.

The needle guiding structure comprises a supporting framework 4, a needle guiding positioning seat is arranged on the supporting framework 4, the supporting framework 45 is fixed on the side face, facing a containing cavity, of the supporting framework 4, a needle guiding positioning hole 46 is arranged on the supporting framework 45, the needle guiding positioning hole 46 penetrates through the supporting framework 4 and the supporting framework 45, the positioning seat is located on the side face of the supporting framework 45 or the end face of the supporting framework 45, or is fixed on the supporting framework 4, a positioning face 47 for positioning a needle 3 is arranged on the positioning seat, the positioning face 47 positions the needle 3 in the containing cavity, as shown in fig. 6 and 7, the plane where the positioning face 47 is located is tangent to the needle guiding positioning hole 46, as shown in fig. 5, the needle 3 comprises a first connecting portion 31 and a second connecting portion 32, the first connecting portion 31 is rotatably arranged in the needle guiding positioning hole 46, both ends of the first connecting portion 31 extend into the containing cavity, the second connecting portion 32 is connected with one end, an adjusting portion α is arranged between the first connecting portion 31 and the second connecting portion 32, an included angle adjusting α is 60-120, the second connecting portion 32 is arranged on the side face, the second connecting portion 31, the connecting portion is staggered, the connecting portion 31, the connecting portion is convenient for being manufactured in a left-right-and-left-right staggered mode, the second connecting portion 32, the adjacent connecting portion, the connecting portion 32, the connecting portion is convenient for manufacturing process, the adjacent needles, the needle guiding structure, the connecting portion is convenient for manufacturing process, the needle guiding needles 3, the connecting portion is formed by staggering for manufacturing, the two adjacent connecting portion, the two connecting portion, the.

And a coil positioning structure for fixing the coil is also arranged on the supporting framework 4. As shown in fig. 6, the coil positioning structure includes two fixing seats 41 and two supporting seats 42, the fixing seats 41 are fixed on the supporting framework 4, and when the pouring hole 48 is disposed in the middle of the supporting framework 4, preferably, the two fixing seats 41 are respectively located at two opposite sides of the pouring hole 48. The lower end of the fixed seat 41 is fixedly connected with the supporting framework 4, and the upper end of the fixed seat 41 is provided with a positioning surface 43 which is matched with the outer ring surface of the coil; the two supports 42 are respectively fixed on the two positioning surfaces 43, and the supports 42 can directly contact with the end surfaces of the iron core 5 or a proper amount of clearance is reserved; the end of the support 42 far away from the positioning surface 43 is provided with a limit block 44, and the limit block 44 is clamped on the inner annular surface of the iron core 5. The positioning surface 43, the support 42 and the stopper 44 position and fix the iron core 5 together. The structure of the limiting block 44 is not limited to the structure shown in fig. 6, and the limiting block 44 and the support 42 may be an integral structure, and the iron core 5 is inserted through the guiding inclined plane on the limiting block 44; the stop block 44 may also be removably mounted to the support 42.

The primary winding 6 and the secondary winding 7 are located on either side of the support 42. The iron core 5 is circular, and the positioning surface 43 is an inward concave arc surface, such as an arc surface or a conical surface, which facilitates the processing of the positioning surface 43 and facilitates the positioning of the coil. The support 42 and the limiting block 44 limit axial and radial displacement of the iron core 5 respectively, the fixing effect is good, the guide pin 3 is not limited by the fixing requirement of the iron core 5 any more, and the length and the structure of the guide pin 3 are more flexible. The length of the needle 3 is reduced and the overall size of the housing is also reduced. Because the needle 3 can rotate relative to the needle positioning hole 46, the welding end of the needle 3 can be rotated to a position far away from the primary winding 6 and the secondary winding 7 before welding, and the heat generated by welding equipment can not directly burn a wire. Meanwhile, the distance between other parts of the guide pin 3 and the primary winding 6 and the secondary winding 7 is large, and heat conducted by the guide pin 3 is not enough to damage the winding 6 and the secondary winding 7 in sequence, so that a heat insulation sleeve is not needed to be sleeved on the outer side of the guide pin 3, the production process is simplified, and the production cost is reduced. After the welding is completed, the needle 3 is rotated so that the second connecting portion 32 abuts on the positioning surface 47.

The basic principles, main features and advantages of the present invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The novel current transformer comprises a shell, wherein a coil is arranged in the shell, the coil comprises an iron core, a primary winding and a secondary winding are wound on the iron core, and the input end and the output end of the primary winding and the input end and the output end of the secondary winding are respectively and electrically connected with a guide pin; the method is characterized in that:

the housing comprises

the positioning seat is fixed on the supporting seat or the supporting framework, and a positioning surface for positioning the guide pin is arranged on the positioning seat; the guide needle comprises

2. The novel current transformer of claim 1, wherein: the coil positioning structure comprises

3. The novel current transformer of claim 2, wherein: the pouring hole is a rectangular hole and is positioned between the two fixing seats.

4. The novel current transformer of claim 2, wherein: the primary winding and the secondary winding are respectively positioned on two sides of the support.

5. The novel current transformer of claim 2, wherein: the iron core is in a circular ring shape, and the positioning surface is an inwards concave cambered surface.

6. The novel current transformer of claim 1, wherein: the cross section of the first connecting part and the cross section of the second connecting part are circular.

7. The novel current transformer of claim 1, wherein: the first connecting portion and the second connecting portion are integrated.

8. The novel current transformer of claim 1, wherein: the adjusting included angle is 60-120 degrees.