Transformer iron core and current transformer thereof

Abstract

The invention relates to the technical field of current transformers, in particular to a transformer iron core and a current transformer thereof, and solves the problems that the iron core of the current transformer is of an integrated structure, has different shapes and needs to be respectively produced by using different molds, so that the production cost is increased, and the whole iron core needs to be replaced after being damaged. The mutual inductor iron core comprises a plurality of first splicing blocks and a plurality of second splicing blocks, first butt joint grooves are formed in the two ends of each first splicing block, first clamping grooves are formed in the outer sides of the two ends of each first splicing block, and two first penetrating and inserting grooves are formed between the adjacent first butt joint grooves and first clamping grooves in a penetrating mode; second butt joint grooves are formed in the two ends of the second splicing block correspondingly, and second clamping grooves are formed in the outer sides of the two ends of the second splicing block correspondingly. The iron core of the current transformer is assembled by adopting a modular structure, only a single module needs to be replaced when the iron core is damaged, and the maintenance cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of current transformer technology, specifically to a transformer core and its current transformer. Background Technology

[0002] The principle of a current transformer is based on the principle of electromagnetic induction. A current transformer consists of a closed iron core and windings. Its primary winding has very few turns and is connected in series with the circuit whose current needs to be measured. Therefore, it often carries the entire current of the circuit. The secondary winding has more turns and is connected in series with the measuring instrument and protection circuit. When the current transformer is working, its secondary circuit is always closed. Therefore, the impedance of the series coil of the measuring instrument and protection circuit is very small, and the working state of the current transformer is close to a short circuit.

[0003] Existing current transformer cores are integral structures with different shapes, requiring separate production using different molds, which increases production costs. Furthermore, the entire core needs to be replaced if it is damaged. Therefore, this does not meet current requirements. To address this, we propose a new transformer core and its corresponding current transformer. Summary of the Invention

[0004] The purpose of this invention is to provide a current transformer core and a current transformer thereof, in order to solve the problems mentioned in the background art, where the current transformer core is an integral structure with different shapes, requiring separate production using different molds, which increases production costs, and the core needs to be replaced as a whole when damaged.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a current transformer core and its current transformer, comprising a plurality of first splicing blocks and a plurality of second splicing blocks, wherein each end of the first splicing block is provided with a first mating groove, and each outer side of both ends of the first splicing block is provided with a first snap-fit ​​groove, and two first through slots are provided through between adjacent first mating grooves and first snap-fit ​​grooves. The second splicing block has a second docking groove at both ends and a second snap-fit ​​groove on the outer side of both ends. Two second through slots are provided between adjacent second docking grooves and second snap-fit ​​grooves. The first docking groove and the second docking groove, the first snap-fit ​​groove and the second snap-fit ​​groove, and the first through slot and the second through slot are all symmetrical structures and have the same size. A splicing connector is detachably installed between the first docking groove, the first snap-fit ​​groove, the first through slot, the second docking groove, the second snap-fit ​​groove and the second through slot.

[0006] Preferably, the splicing connector includes a filler block and a mating block. The end of the mating block is slidably engaged with the inner side of the first mating groove and the second mating groove. The filler block is slidably engaged with the inner side of the first engaging groove and the second engaging groove. The surface of the mating block facing the filler block has two locking grooves. Rotary engaging arms are rotatably installed at both ends of the filler block. One end of the rotary engaging arm passes through the first through slot and the second through slot and engages inside the locking groove.

[0007] Preferably, an anti-interference groove is provided at the middle of the end where the rotating snap-fit ​​arm connects to the docking block, and the widths of the two ends of the second through slot are inconsistent.

[0008] Preferably, both ends of the filling block are provided with notches, one end of the rotating snap-fit ​​arm is located inside the notch and the end is inserted through a connecting shaft pin, and both ends of the connecting shaft pin are rotatably inserted into the interior of the filling block.

[0009] Preferably, a through groove is provided on the inner side of the notch, the through groove penetrates the outer surface of the filling block, and a fixing piece is movably provided on the inner side of the through groove, one end of the fixing piece being fixed to the end of the rotating snap-fit ​​arm.

[0010] Preferably, the end of the rotating snap-fit ​​arm located inside the notch is provided with a pressure groove, the notch has an inner limiting groove, and an elastic pressure connector is provided between the pressure groove and the limiting groove. The two ends of the elastic pressure connector are respectively inserted into the inner sides of the pressure groove and the limiting groove.

[0011] Preferably, the end of the rotating snap-fit ​​arm located inside the mating block is a quarter-circle arc, and the height of this end of the rotating snap-fit ​​arm is less than or equal to the height of the first through slot and the second through slot.

[0012] Preferably, the elastic pressure connector includes a right-angle plate, which is a rigid structure and has a right-angle shape. An elastic adjustment shrink plate is fixed to the end of the right-angle plate near the rotating snap-fit ​​arm, and a pressure plate is fixed to the other end of the elastic adjustment shrink plate.

[0013] Preferably, the elastic adjusting shrink plate is V-shaped and is an elastic component, and the pressing plate is in an inclined state with the inclination angle consistent with the inclination angle of the rotating snap-fit ​​arm.

[0014] A current transformer, comprising a transformer core.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention designs the current transformer core as a first splicing block in the shape of a quarter-circle arc and a second splicing block in the shape of a straight strip. The first splicing block and the second splicing block are spliced ​​and assembled using splicing connectors. The first splicing block and the second splicing block are used to form current transformer cores with different shapes. Therefore, it is not necessary to prepare molds according to the shape of the core, thereby reducing equipment adoption and production costs. 2. By adopting a modular design, this invention allows for the disassembly of only the first or second splicing block when the iron core is damaged. It also facilitates the separation of the iron core from the external coil, reducing the difficulty of maintaining, repairing, or replacing the transformer iron core. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the assembly of the first splicing block and the first splicing block according to the present invention; Figure 2 This is a schematic diagram of the assembly of the first splicing block and two second splicing blocks of the present invention; Figure 3 This is a schematic diagram of the assembly of the first splicing block and four second splicing blocks of the present invention; Figure 4 This is a schematic diagram of the structure of the first splicing block of the present invention; Figure 5 This is a schematic diagram of the structure of the second splicing block of the present invention; Figure 6 This is a schematic diagram of the structure of the splicing connector of the present invention; Figure 7 This is a schematic diagram showing the connection between the filling block and the docking block of the present invention; Figure 8 for Figure 7 Enlarged view of the structure at point A in the middle; Figure 9 This is a schematic diagram of the structure of the elastic pressure connector of the present invention.

[0017] In the diagram: 1. First splicing block; 2. Second splicing block; 3. First mating groove; 4. Splicing connector; 401. Filler block; 402. Locking groove; 403. Butt joint block; 404. Rotary snap-fit ​​arm; 405. Connecting pin; 406. Fixing plate; 407. Elastic pressure connector; 4071. Right angle plate; 4072. Elastic adjusting shrink plate; 4073. Pressing plate; 408. Pressurizing groove; 409. Through groove; 410. Limiting groove; 411. Anti-interference groove; 5. First snap-fit ​​groove; 6. First through slot; 7. Second mating groove; 8. Second snap-fit ​​groove; 9. Second through slot. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] like Figures 1 to 5 As shown, a current transformer core includes multiple first splicing blocks 1 and multiple second splicing blocks 2. Each end of the first splicing block 1 is provided with a first docking groove 3, and each outer side of the two ends of the first splicing block 1 is provided with a first snap-fit ​​groove 5. Two first through slots 6 are provided between adjacent first docking grooves 3 and first snap-fit ​​grooves 5.

[0020] The second splicing block 2 has a second docking groove 7 at both ends and a second snap-fit ​​groove 8 on the outer side of both ends. Two second through slots 9 are provided between adjacent second docking grooves 7 and second snap-fit ​​grooves 8. The first docking groove 3 and the second docking groove 7, the first snap-fit ​​groove 5 and the second snap-fit ​​groove 8, and the first through slot 6 and the second through slot 9 are all symmetrical structures with the same size. A splicing connector 4 is detachably installed between the first docking groove 3, the first snap-fit ​​groove 5, the first through slot 6, the second docking groove 7, the second snap-fit ​​groove 8 and the second through slot 9. The splicing connector 4 is used to splice and assemble the first splicing block 1 with the first splicing block 1 or the first splicing block 1 with the second splicing block 2, so that the first splicing block 1 and the second splicing block 2 form iron cores of different shapes, thus eliminating the need to customize a set of forming equipment for each type of iron core.

[0021] like Figures 6 to 8 As shown, the splicing connector 4 includes a filling block 401 and a docking block 403. The end of the docking block 403 is slidably engaged with the inner side of the first docking groove 3 and the second docking groove 7. The filling block 401 is slidably engaged with the inner side of the first engaging groove 5 and the second engaging groove 8. The surface of the docking block 403 facing the filling block 401 has two locking grooves 402. Both ends of the filling block 401 are rotatably mounted with rotating engaging arms 404. One end of the rotating engaging arm 404 passes through the first through slot 6 and the second through slot 9 and engages with the inside of the locking groove 402. The ends of the first splicing block 1 or the first splicing block 1 and the second splicing block 2 are docked through the docking block 403. Then, the filling block 401 and the docking block 403 are connected through the rotating engaging arm 404, thereby locking the first splicing block 1 or the first splicing block 1 and the second splicing block 2.

[0022] An anti-interference groove 411 is provided at the middle of the end where the rotating snap-fit ​​arm 404 and the docking block 403 are docked. The widths of the two ends of the second through slot 9 are not the same, so as to ensure that after the rotating snap-fit ​​arm 404 locks the filling block 401, the docking block 403 cannot be separated from the first splicing block 1 and the second splicing block 2 in its length direction.

[0023] Both ends of the filling block 401 are provided with notches. One end of the rotating snap-fit ​​arm 404 is located inside the notch and a connecting shaft pin 405 is inserted through the end. Both ends of the connecting shaft pin 405 are rotatably inserted into the interior of the filling block 401. A through groove 409 is provided inside the notch and penetrates the outer surface of the filling block 401. A fixing piece 406 is movably provided inside the through groove 409. One end of the fixing piece 406 is fixed to the end of the rotating snap-fit ​​arm 404. By pushing the fixing piece 406 into the notch, the rotating snap-fit ​​arm 404 can be rotated, separating the rotating snap-fit ​​arm 404 from the docking block 403. The through groove 409 is exposed to facilitate the gripping of the filling block 401.

[0024] The rotating snap-fit ​​arm 404 has a pressure groove 408 at its end inside the notch and a limiting groove 410 on the inner side of the notch. An elastic pressure connector 407 is provided between the pressure groove 408 and the limiting groove 410. The two ends of the elastic pressure connector 407 are respectively inserted into the inner side of the pressure groove 408 and the limiting groove 410. The elastic pressure connector 407 is an elastic component used to limit the angle of the rotating snap-fit ​​arm 404, ensuring that the rotating snap-fit ​​arm 404 can be locked inside the locking groove 402 after passing through the first through slot 6 and the second through slot 9, thereby strengthening the connection stability between the filling block 401 and the mating block 403.

[0025] The end of the rotating snap-fit ​​arm 404 located inside the mating block 403 is a quarter-circle arc. The height of this end of the rotating snap-fit ​​arm 404 is less than or equal to the height of the first through slot 6 and the second through slot 9, ensuring that the end of the rotating snap-fit ​​arm 404 can rotate around the connecting shaft pin 405 after being squeezed when passing through the first through slot 6 and the second through slot 9, without affecting the installation or removal of the rotating snap-fit ​​arm 404.

[0026] like Figure 9 As shown, the elastic pressure connector 407 includes a right-angle plate 4071, which is a rigid structure with a right-angle shape. An elastic adjustment shrink plate 4072 is fixed to the end of the right-angle plate 4071 near the rotating snap-fit ​​arm 404. A pressure plate 4073 is fixed to the other end of the elastic adjustment shrink plate 4072. The elastic adjustment shrink plate 4072 is V-shaped and is an elastic component. The pressure plate 4073 is in an inclined state and the inclination angle is consistent with the inclination angle of the rotating snap-fit ​​arm 404. The pressure plate 4073 applies pressure to the rotating snap-fit ​​arm 404, thereby ensuring the stability of the angle of the rotating snap-fit ​​arm 404. The presence of the elastic adjustment shrink plate 4072 allows the elastic pressure connector 407 to deform smoothly when the rotating snap-fit ​​arm 404 rotates, preventing damage to the elastic pressure connector 407 after being subjected to force.

[0027] First, select a suitable iron core shape according to the type of current transformer for its assembly. During assembly, insert one end of the mating block 403 into the first mating groove 3 or second mating groove 7 at the end of the first splicing block 1 or the second splicing block 2. Then, mate the ends of the two first splicing blocks 1 or the first splicing block 1 and the second splicing block 2, so that the mating block 403 is enclosed by the two first splicing blocks 1 or the first splicing block 1 and the second splicing block 2. At this time, snap the filling block 401 into the first snap-fit ​​groove 5 or the second snap-fit ​​groove 8. During snap-fit, rotate the end of the snap-fit ​​arm 404 and move it into the first through slot 6 or the second through slot 9. After the rotating snap-fit ​​arm 404 contacts the edge of the first through slot 6 or the second through slot 9, it is compressed and surrounds the connecting shaft pin. As the axis of 405 rotates, the angle between the rotating snap-fit ​​arm 404 and the filler block 401 increases, and the elastic pressure connector 407 elastically deforms until the filler block 401 enters the first snap-fit ​​groove 5 and the second snap-fit ​​groove 8. At this time, the end of the rotating snap-fit ​​arm 404 enters the locking groove 402, and the elastic pressure connector 407 elastically returns to its original position, causing the rotating snap-fit ​​arm 404 to reset. This locks the mating block 403 and the filler block 401 together. At the same time, the two first splicing blocks 1 or the first splicing block 1 and the second splicing block 2 are locked by the rotating snap-fit ​​arm 404, which quickly realizes the assembly of the iron core. The first splicing block 1 and the second splicing block 2 adopt modular assembly, which does not require mold preparation according to the shape of the iron core, thus reducing equipment adoption and production costs.

[0028] A current transformer, comprising a transformer core.

[0029] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A current transformer core and its current transformer, comprising a plurality of first splicing blocks (1) and a plurality of second splicing blocks (2), characterized in that: The first splicing block (1) has a first docking groove (3) at both ends, and a first snap-fit ​​groove (5) on the outer side of both ends of the first splicing block (1). Two first through slots (6) are provided between adjacent first docking grooves (3) and first snap-fit ​​grooves (5). The second splicing block (2) is provided with a second docking groove (7) at both ends, and a second snap-fit ​​groove (8) is provided on the outer side of both ends of the second splicing block (2). Two second through slots (9) are provided between adjacent second docking grooves (7) and second snap-fit ​​grooves (8). The first docking groove (3) and the second docking groove (7), the first snap-fit ​​groove (5) and the second snap-fit ​​groove (8), and the first through slot (6) and the second through slot (9) are all symmetrical structures and have the same size. A splicing connector (4) is detachably installed between the first docking groove (3), the first snap-fit ​​groove (5), the first through slot (6), the second docking groove (7), the second snap-fit ​​groove (8), and the second through slot (9).

2. The current transformer core and its current transformer according to claim 1, characterized in that: The splicing connector (4) includes a filling block (401) and a docking block (403). The end of the docking block (403) is slidably engaged with the inner side of the first docking groove (3) and the second docking groove (7). The filling block (401) is slidably engaged with the inner side of the first engaging groove (5) and the second engaging groove (8). The surface of the docking block (403) facing the filling block (401) has two locking grooves (402). Both ends of the filling block (401) are rotatably mounted with rotating engaging arms (404). One end of the rotating engaging arm (404) passes through the first through slot (6) and the second through slot (9) and engages inside the locking groove (402).

3. A current transformer core and its current transformer according to claim 2, characterized in that: An anti-interference groove (411) is provided at the middle of the end where the rotating snap-fit ​​arm (404) connects with the docking block (403), and the widths of the two ends of the second through slot (9) are inconsistent.

4. A current transformer core and its current transformer according to claim 3, characterized in that: Both ends of the filling block (401) are provided with notches. One end of the rotating snap-fit ​​arm (404) is located inside the notch and the end is inserted through a connecting pin (405). Both ends of the connecting pin (405) are rotatably inserted into the interior of the filling block (401).

5. A current transformer core and its current transformer according to claim 4, characterized in that: The notch has a through groove (409) on its inner side, the through groove (409) penetrates the outer surface of the filling block (401), and a fixing piece (406) is movably provided on the inner side of the through groove (409). One end of the fixing piece (406) is fixed to the end of the rotating snap-fit ​​arm (404).

6. A current transformer core and its current transformer according to claim 4, characterized in that: The rotating snap-fit ​​arm (404) has a pressure groove (408) at the end inside the notch, and a limiting groove (410) on the inner side of the notch. An elastic pressure connector (407) is provided between the pressure groove (408) and the limiting groove (410). The two ends of the elastic pressure connector (407) are respectively inserted into the inner side of the pressure groove (408) and the limiting groove (410).

7. A current transformer core and its current transformer according to claim 6, characterized in that: The end of the rotating snap-fit ​​arm (404) located inside the mating block (403) is a quarter-circle arc, and the height of this end of the rotating snap-fit ​​arm (404) is less than or equal to the height of the first through slot (6) and the second through slot (9).

8. A current transformer core and its current transformer according to claim 6, characterized in that: The elastic pressure connector (407) includes a right-angle plate (4071), which is a rigid structure and has a right-angle shape. An elastic adjustment shrink plate (4072) is fixed to the end of the right-angle plate (4071) near the rotating snap-fit ​​arm (404), and a pressure plate (4073) is fixed to the other end of the elastic adjustment shrink plate (4072).

9. A current transformer core and its current transformer according to claim 8, characterized in that: The elastic adjustment shrink plate (4072) is V-shaped and is an elastic component, and the clamping plate (4073) is in an inclined state with the inclination angle consistent with the inclination angle of the rotating snap-fit ​​arm (404).

10. A current transformer, characterized in that: Includes the current transformer core as described in any one of claims 1-9.

Images