Plug-in current transformer

Abstract

The utility model discloses a plug-in type current transformer which comprises a shell, a framework, a coil, a magnetic core, a primary leading needle and two secondary L needles, the framework is arranged in the shell, opposite supporting plates are arranged on the tops of two opposite long frames of the framework respectively, a limiting part is arranged on the top of the inner side of one supporting plate, and a limiting part is arranged on the top of the inner side of the other supporting plate. A limiting part is arranged on the inner side of the magnetic core, blocking parts are arranged on the inner sides of the two opposite supporting plates below the limiting part, the coil is located between the two opposite supporting plates, the magnetic core wound with the coil is clamped front and back through the two supporting plates, the limiting part is arranged on the inner side of at least one supporting plate, and the blocking parts are arranged at the bottoms of the inner sides of the two supporting plates. Therefore, the stability and firmness of coil installation are improved; therefore, a distance can be automatically reserved between the primary guide pin and the coil, and the pressure-resistant requirement between the primary and secondary stages can be ensured after a finished product is encapsulated by resin.

Description

Technical Field

[0001] The utility model relates to the technical field of current transformers, and specifically relates to an insertion type current transformer. Background Art

[0002] The function of a current transformer is to convert the large current in a circuit into a smaller secondary current in proportion for measuring instruments or protection devices to process signals. A current transformer consists of a magnetic core and windings. When assembling an insertion type transformer, guide pins need to be installed. The shell structure of the existing transformers is simple, which is not convenient for fixing the magnetic core coil, resulting in low assembly efficiency. Summary of the Utility Model

[0003] In order to make up for the above deficiencies, the utility model provides an insertion type current transformer to solve the problems in the above background art.

[0004] The technical solution of the utility model is as follows:

[0005] An insertion type current transformer includes a shell, a skeleton, a coil, a magnetic core, a primary lead pin and two secondary L pins. The skeleton is arranged inside the shell. Opposite top parts of two relatively long side frames of the skeleton are respectively provided with opposite support plates. A limiting part is arranged at the inner top of one of the support plates. Blocking parts are arranged on the inner sides of the two relatively support plates below the limiting part. The coil is located between the two relatively support plates. The coil is wound around the toroidal surface of the magnetic core. The bottom of the exposed part of the outer ring surface of the magnetic core is located above the blocking part. The top of the exposed part of the inner ring surface of the magnetic core is located below the limiting part. The horizontal section of the primary lead pin passes through the center of the coil. First pins and second pins are respectively arranged at both ends of the horizontal section. The lower ends of the first pin and the second pin are respectively inserted into the skeleton. The support plates support the bottom of the horizontal section. The vertical part of the secondary L pin is inserted into the skeleton. The skeleton is provided with pin holes respectively for the lower ends of the first pin, the lower end of the second pin and the vertical parts of the two secondary L pins to pass through.

[0006] As a preferred technical solution, the pin holes for the secondary L pins are located at both ends of the short side frame on one side of the skeleton, and the pin holes at both ends of the short side frame protrude from the outer surface of the skeleton.

[0007] As a preferred technical solution, limiting plates that are attached to the horizontal parts of the secondary L pins are arranged behind the inner sides of the pin holes at both ends of the short side frame.

[0008] As a preferred technical solution, the horizontal parts of the secondary L pins are welded to the enameled wires of the coil.

[0009] As a preferred technical solution, the first pin extends vertically downward; the second pin includes an inclined section that is inclined downward and bent and is connected to one end of the horizontal section away from the first pin. The lower end of the inclined section is provided with a vertical section that is vertically bent downward, and the vertical section is inserted into the corresponding pin hole. One of the support plates is provided with an inclined positioning surface that supports the bottom of the inclined section.

[0010] As a preferred technical solution, the coil is wound around the magnetic core in a C shape.

[0011] Due to the adoption of the above technical solution, an insert type current transformer includes a housing, a skeleton, a coil, a magnetic core, a primary lead pin and two secondary L pins. The housing is provided with the skeleton. Opposite long side frame tops of the skeleton are respectively provided with opposite support plates. The inner top of one of the support plates is provided with a limiting portion. Opposite inner sides of the two support plates below the limiting portion are provided with blocking portions. The coil is located between the two opposite support plates. The coil is wound around the toroidal surface of the magnetic core. The bottom of the exposed portion of the outer ring surface of the magnetic core is located above the blocking portion. The top of the exposed portion of the inner ring surface of the magnetic core is located below the limiting portion. The horizontal section of the primary lead pin passes through the center of the coil. Both ends of the horizontal section are respectively provided with a first pin and a second pin. The lower ends of the first pin and the second pin are both inserted into the skeleton. The support plates support the bottom of the horizontal section. The vertical portions of the secondary L pins are inserted into the skeleton. The skeleton is provided with pin holes for the lower ends of the first pin, the lower end of the second pin and the vertical portions of the two secondary L pins to pass through respectively. In this application of the utility model, the coil is clamped front and back by two support plates, and at least one of the inner sides of the support plates is provided with a limiting portion, and blocking portions are provided at the inner bottoms of the two support plates, thereby improving the stability and firmness of the coil installation; thus facilitating the automatic leaving of a distance between the primary lead pin and the coil, and ensuring the withstand voltage requirement between the primary and secondary sides after the finished product is resin potted; improving production efficiency and reducing production costs.

[0012] Moreover, the assembly process is greatly optimized. For example, there is no need to put on an insulating tube or trim the lead pins, etc. After optimization, it can greatly save labor and time, and improve the product qualification rate. Further, it can more conveniently realize the production of an automated production line. Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 Schematic structural diagram of an embodiment of the present utility model;

[0015] Figure 2 Left view of the skeleton of an embodiment of the present utility model;

[0016] Figure 3 Schematic structural diagram of the skeleton of an embodiment of the present utility model;

[0017] Figure 4 Schematic structural diagram of the primary lead pin structure of an embodiment of the present utility model;

[0018] Figure 5 Schematic structural diagram of the secondary L - pin structure of an embodiment of the present utility model;

[0019] Figure 6 Cross - sectional view of the housing of an embodiment of the present utility model;

[0020] Figure 7 Schematic structural diagram of the coil assembled on the skeleton of an embodiment of the present utility model;

[0021] Wherein: 1 - housing; 2 - coil; 3 - skeleton; 30 - long side frame; 31 - short side frame; 4 - primary lead pin; 5 - secondary L - pin; 6 - support plate; 7 - horizontal section; 8 - first pin; 9 - second pin; 10 - positioning groove; 11 - pin insertion hole; 12 - inclined section; 13 - vertical section; 14 - positioning surface; 15 - limiting plate; 16 - limiting portion; 17 - blocking portion; 18 - magnetic core; 100 - limiting groove; 101 - inclined surface; 102 - blocking block. Specific embodiments

[0022] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] Embodiment, as Figures 1 to 7 shown, an insert - type current transformer includes a housing 1 with an open bottom, a coil 2, a skeleton 3, a primary lead pin 4 and two secondary pins 5. The coil 2, the primary lead pin 4 and the secondary L - pin 5 are all assembled on the skeleton 3, and the skeleton 3 is assembled in the housing 1.

[0024] Inside the housing 1, there is provided a framework 3. On the top parts of two opposite long side frames 30 of the framework 3, there are respectively provided opposite support plates 6. On the inner top of one of the support plates 6, there is provided a limiting part 16. Below the limiting part 16, on the inner sides of two opposite support plates 6, there are provided blocking parts 17. The coil 2 is located between two opposite support plates 6. The coil 2 is wound around the toroidal surface of the magnetic core 18. The bottom of the exposed part 180 of the outer ring surface of the magnetic core 18 is located above the blocking part 17. The top of the exposed part 180 of the inner ring surface of the magnetic core 18 is located below the limiting part 16. While the opposite support plates 6 clamp the magnetic core 18, a structure for relatively fixing the magnetic core is provided through the framework, that is, it is limited and fixed by the blocking part 17 and the limiting part 16, improving stability and also ensuring that the primary lead pin 4 does not contact the coil 2, eliminating the need to use an insulating tube sleeve and reducing costs.

[0025] The primary lead pin 4 includes a horizontal section 7 passing through the center of the coil 2. At both ends of the horizontal section 7, there are respectively provided a first pin 8 and a second pin 9. The first pin 8 and the second pin 9 are respectively located on the front and back sides of the coil 2. The lower ends of the first pin 8 and the second pin 9 are respectively inserted into the framework 3. The support plate 6 supports the bottom of the horizontal section 7. The cross-section of the horizontal section 7 is cylindrical. The upper end of the support plate 6 is provided with an arc-shaped positioning groove 10 matching the horizontal section 7. During assembly, the horizontal section 7 of the primary lead pin 4 is passed through the center of the coil 2, and the lower ends of the first pin 8 and the second pin 9 are inserted into the framework 3, so that the horizontal section 7 is sunk into the positioning groove 10 at the upper end of the support plate 6, facilitating the positioning of the installation position of the primary lead pin 4.

[0026] Inside the housing 1, there are relatively provided limiting grooves 100. One end of the limiting groove 100 is provided with a downward inclined surface 101, which can prevent the pins of the primary lead pin 4 from being exposed too short. At the other end of the limiting groove 100 and the bottom end of the inclined surface 101, there are respectively provided blocking blocks 102. There are a total of four blocking blocks 102 on the opposite side surfaces of the housing 1 having the limiting grooves 100. The bottoms of the four blocking blocks 102 are on the same plane, thus forming a limiting structure for the installation of the framework 3. Coupled with the limitation of the framework 3, the uniformity of the lead pin length of the product can be ensured. The primary lead pin insertion hole 11 is relatively long, and the positioning groove 10 and the positioning surface 14 can make the first pin 8 and the second pin 9 of the primary lead pin 4 exposed outside the housing 1 perpendicular to the outer plane of the framework 3.

[0027] The vertical part of the secondary L-pin 5 is inserted into the skeleton 3. When assembling the secondary L-pin 5, insert the vertical part of the secondary L-pin 5 into the skeleton 3, and wind the secondary lead on the coil 2 around the horizontal part of the secondary L-pin 5. When winding the secondary lead, the horizontal part of the secondary L-pin 5 can be rotated to a side deviating from the coil 2, so as to expand the operation space and improve the convenience of assembly. The secondary L-pin 5 is screwed out of the outside of the skeleton 3 and welded to the enameled wire of the coil 2. After welding, it is screwed into the specified position inside the skeleton 3, and the skeleton limit plate 15 guides it to the limit position.

[0028] The skeleton 3 is provided with pin holes 11 respectively for the lower ends of the first pin 8, the lower end of the second pin 9 and the vertical parts of the two secondary pins 5 to pass through.

[0029] The pin holes 11 for the secondary L-pin 5 are located at both ends of the short side frame 31 on one side of the skeleton 3, and the pin holes 11 at both ends of the short side frame 31 protrude from the outer surface of the skeleton 3. Thereby, it is avoided that the primary lead pin 4 and the secondary L-pin 5 are prone to shaking when inserted on the skeleton 3.

[0030] Behind the inner sides of the pin holes 11 at both ends of the short side frame 31, there are limit plates 15 attached to the horizontal parts of the secondary L-pins 5. When the horizontal parts of the secondary L-pins 5 are attached to the limit plates 15, the horizontal parts of the secondary L-pins 5 are retracted into the inside of the skeleton 3.

[0031] The horizontal part of the secondary L-pin 5 is welded to the enameled wire of the coil 2.

[0032] The first pin 8 extends vertically downward; the second pin 9 includes an inclined section 12 that is inclined downward and bent at one end of the horizontal section 7 away from the first pin 8. The lower end of the inclined section 12 is provided with a vertical section 13 that is vertically downward and bent, and the vertical section 13 is inserted into the corresponding pin hole 11. An inclined positioning surface 14 that supports the bottom of the inclined section 12 is provided on one of the support plates 6.

[0033] The coil 2 is wound around the magnetic core 18 in a C shape.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A plug-in current transformer, characterized in that: The invention comprises a shell, a frame, a coil, a magnetic core, a primary lead pin and two secondary L pins. The frame is arranged in the shell. Two opposite long frames of the frame are respectively arranged at the top of opposite support plates, one of the support plates is provided with a limiting portion at the top of the inner side, and two opposite support plates below the limiting portion are provided with blocking portions on the inner sides. The coil is located between the two opposite support plates. The coil is wound on the annular surface of the magnetic core. The bottom of the exposed portion of the outer annular surface of the magnetic core is located above the blocking portion, and the top of the exposed portion of the inner annular surface of the magnetic core is located below the limiting portion. The horizontal section of the primary lead pin passes through the center of the coil. The two ends of the horizontal section are respectively provided with a first pin and a second pin. The lower end of the first pin and the lower end of the second pin are both plugged into the frame, and the support plate is supported at the bottom of the horizontal section. The vertical part of the secondary L pin is plugged into the frame. The frame is provided with pin holes for the lower end of the first pin, the lower end of the second pin and the vertical parts of the two secondary L pins to pass through.

2. A plug-in current transformer as claimed in claim 1, characterized in that: The pin holes for the secondary L pins are located at two ends of a short frame on one side of the frame, and the pin holes at two ends of the short frame protrude from the outer surface of the frame.

3. A plug-in current transformer as claimed in claim 2, characterized in that: A limiting plate is provided at the rear inner side of the pin hole at both ends of the short frame, which is attached to the horizontal part of the secondary L pin.

4. The plug-in current transformer according to claim 1, characterized in that: The horizontal portion of the secondary L needle is welded to the enameled wire of the coil.

5. The plug-in current transformer according to claim 1, characterized in that: The first pin extends vertically downward; the second pin includes an inclined section connected to the end of the horizontal section away from the first pin and bent obliquely downward, and the lower end of the inclined section is provided with a vertical section bent vertically downward, and the vertical section is inserted into the corresponding pin hole, and one of the support plates is provided with an inclined positioning surface supported on the bottom of the inclined section.

6. The plug-in current transformer according to claim 1, characterized in that: The coil is wound on the magnetic core in a C shape.

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