A current transformer for a molded case circuit breaker
By introducing structures such as arc-shaped grooves and limiting blocks into the current transformer, the problem of wire harness entanglement is solved, the neat arrangement of the wire harness and convenient maintenance are achieved, and the operating stability and efficiency of the current transformer are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YUEQING CUNYU CIHUAN LINE CIRCLE FACTORY
- Filing Date
- 2025-05-12
- Publication Date
- 2026-06-12
AI Technical Summary
Existing current transformers are prone to wire harness tangling during installation, which affects the stability and efficiency of the current and makes it impossible to ensure that the wire harness is neatly arranged.
The design incorporates arc-shaped grooves, limiting blocks, collars, return springs, and locking blocks. Through the cooperation of the limiting blocks and locking blocks, the wire harness is neatly arranged and fixed, preventing tangling.
This achieves neat arrangement of wire harnesses, avoids tangling, ensures current stability and efficiency, and facilitates the inspection and maintenance of current transformers.
Smart Images
Figure CN224355085U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of current transformer technology, specifically a current transformer for a molded case circuit breaker. Background Technology
[0002] A current transformer is an instrument that measures a large primary current by converting it into a small secondary current 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 measuring instruments and protection circuits. Current transformers are often configured together with molded case circuit breakers to accurately measure circuit current values, provide timely warnings and interrupt fault currents, and ensure the safe and stable operation of the power system.
[0003] In existing technologies, such as the current transformer proposed in patent application number "CN202421154644.1", a central rod is fitted with a hand-tightening nut. A short bolt, a hexagonal nut, and a nut cap are inserted into the same central rod. A bushing is fitted onto the lower half of the central rod, and several retainers are fixedly installed on the bushing. A spring is fixedly installed in the middle of each retainer. By controlling the expansion of the threaded arc rod, the current transformer can be quickly installed and disassembled, making it convenient for users.
[0004] However, the aforementioned patent application cannot guarantee that the wire harnesses passing through the current transformer are neatly arranged, and the wire harnesses may become entangled, resulting in an increase in the effective length of the wire harnesses, thereby increasing the resistance, affecting the stability and efficiency of the current, and affecting the normal monitoring operation of the current transformer. Utility Model Content
[0005] The purpose of this invention is to provide a current transformer for a molded case circuit breaker to solve the problems mentioned in the background art.
[0006] The objective of this utility model can be achieved through the following technical solutions:
[0007] A current transformer for a molded case circuit breaker includes a main body, a mounting base fixedly connected to the outer wall of the main body, a movably mounted split body on the outer wall of the main body, a plurality of arc-shaped grooves formed on the inner wall of the main body, an arc-shaped rod fixedly installed inside each of the arc-shaped grooves, a plurality of collars and tension springs sleeved on the outer side of each arc-shaped rod, a limit block fixedly connected to the outer wall of each of the collars, an iron core fixedly installed inside the main body, a plurality of arc-shaped positioning grooves and vertical grooves formed on the outer wall of the main body, an arc-shaped positioning plate inserted inside the arc-shaped positioning grooves, a fixing plate inserted inside the vertical grooves, and both the fixing plate and one end of the arc-shaped positioning grooves being fixedly connected to the split body.
[0008] Preferably, the limiting block has wire-locking grooves on both outer side walls, and a plug plate is inserted into one end of the limiting block.
[0009] Preferably, a horizontal groove is formed on the upper surface of the limiting block, a slide rod is fixedly installed inside the horizontal groove, a slide plate is sleeved on the outside of the slide rod, and the bottom end of the slide plate is fixedly connected to the insert plate. A return spring is sleeved on the outside of the slide rod and between the inner wall of the horizontal groove and the slide plate.
[0010] Preferably, a spring is fixedly connected to one end of the insert plate, and a locking block is fixedly connected to both outer side walls of the spring. A plurality of slots are provided on the inner wall of the main body, and a slot is provided on both inner walls of the plurality of slots, and the slot and the locking block are matched.
[0011] Preferably, the two outer side walls of the fixed plate are provided with movable grooves, and T-shaped plates are slidably connected inside the two movable grooves.
[0012] Preferably, a spring sheet is installed between one end of the T-shaped plate and the inner wall of the movable groove, and one end of the spring sheet is fixedly connected to the T-shaped plate, while the other end of the spring sheet is fixedly connected to the inner wall of the movable groove.
[0013] Preferably, the two inner sidewalls of the vertical groove are provided with fixing grooves, and the fixing grooves are matched with one end of the T-shaped plate.
[0014] The beneficial effects of this utility model are:
[0015] 1. This utility model uses an arc-shaped rod and a collar to move one of the limiting blocks, pushing the wire harness so that it is positioned between the two limiting blocks. With the cooperation of a return spring, a sliding plate, and a locking block, the position of the spring piece is fixed in the slot, thereby fixing the position of the limiting blocks and limiting the wire harness. Similarly, the next turn of the winding wire harness can be positioned, so that the wire harnesses wound or inserted on the current transformer can be neatly arranged, avoiding the wire harnesses from tangling and causing interference.
[0016] 2. This utility model allows the split unit to be removed by pulling it away from the main body, causing the arc-shaped positioning plate to move outward from the arc-shaped positioning groove and the fixing plate to move outward from the vertical groove. At this time, the interior of the main body can be inspected. After the inspection is completed, the fixing plate can be re-fixed inside the vertical groove by using the T-shaped plate, spring sheet and fixing groove, thereby re-fixing the split unit to the main body. Through the above operation, by setting up a split unit that is easy to disassemble and assemble, the interior of the main body can be easily inspected, ensuring the normal operation of the current transformer. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0019] Figure 2 This is a cross-sectional view of the main body of this utility model;
[0020] Figure 3 This is a partial structural diagram of the main body of this utility model;
[0021] Figure 4 This utility model Figure 3 Enlarged view of point A in the middle;
[0022] Figure 5 This is a partial structural schematic diagram of the present invention;
[0023] Figure 6 This is a schematic diagram of the arc-shaped slide and the limiting block in this utility model;
[0024] Figure 7 This utility model Figure 6 Enlarged view of point B in the middle;
[0025] Figure 8 This is a schematic diagram of the arc-shaped positioning plate and the arc-shaped positioning groove in this utility model;
[0026] Figure 9 This utility model Figure 8 Enlarged view of point B in the middle;
[0027] Figure 10 This is a partial sectional view of the main body of this utility model;
[0028] Figure 11 This utility model Figure 10 Enlarged view of point C in the middle.
[0029] The attached figures are labeled as follows:
[0030] 1. Main body; 2. Mounting base; 3. Iron core; 4. Separate parts; 5. Arc-shaped slide groove; 6. Arc-shaped rod; 7. Collar; 8. Limiting block; 9. Insert plate; 10. Spring piece; 11. Locking block; 12. Locking groove; 13. Slot; 14. Slide rod; 15. Slide plate; 16. Fixing plate; 17. T-shaped plate; 18. Spring piece; 19. Movable groove; 20. Fixing groove; 21. Arc-shaped positioning plate; 22. Vertical groove; 23. Arc-shaped positioning groove; 24. Wire locking groove. Detailed Implementation
[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0032] A current transformer for a molded case circuit breaker, such as Figures 1-11 As shown, the device includes a main body 1, a mounting base 2 fixedly connected to the outer wall of the main body 1, a split body 4 movably installed on the outer wall of the main body 1, several arc-shaped sliding grooves 5 opened on the inner wall of the main body 1, arc-shaped rods 6 fixedly installed inside each of the arc-shaped sliding grooves 5, several collars 7 and tension springs sleeved on the outside of the arc-shaped rods 6, limit blocks 8 fixedly connected to the outer wall of each of the collars 7, an iron core 3 fixedly installed inside the main body 1, several arc-shaped positioning grooves 23 and vertical grooves 22 opened on the outer wall of the main body 1, an arc-shaped positioning plate 21 inserted inside the arc-shaped positioning groove 23, a fixing plate 16 inserted inside the vertical groove 22, and a fixing plate 16 and one end of the fixing plate 16 and the arc-shaped positioning groove 23 fixedly connected to the split body 4.
[0033] The tension spring can limit the position between the two collars 7, so that there is a certain gap between the two limiting blocks 8, which is used to insert the wire harness to be fixed.
[0034] The two outer side walls of the limiting block 8 are provided with wire-locking grooves 24. One end of the limiting block 8 is inserted with a plate 9. The upper surface of the limiting block 8 is provided with a horizontal groove. A slide rod 14 is fixedly installed inside the horizontal groove. A slide plate 15 is sleeved on the outside of the slide rod 14, and the bottom end of the slide plate 15 is fixedly connected to the plate 9. A return spring is sleeved on the outside of the slide rod 14 and between the inner wall of the horizontal groove and the slide plate 15.
[0035] One end of the insert plate 9 is fixedly connected to a spring piece 10. Both outer walls of the spring piece 10 are fixedly connected to a locking block 11. The inner wall of the main body 1 has several slots 13. Both inner walls of the slots 13 have locking grooves 12, and the locking grooves 12 fit into the locking blocks 11. By using the elastic force of the spring piece 10 to cooperate with the locking blocks 11 and locking grooves 12, the position of the spring piece 10 can be limited within the slots 13, thereby fixing the position of the insert plate 9.
[0036] In use, when winding the wire onto the main body 1, the wire harness can be passed through the interior of the main body 1 and wound between the two limiting blocks 8. Then, pull the insert plate 9 on one of the limiting blocks 8, causing the spring piece 10 to move out of the slot 13. The slide plate 15 follows the insert plate 9 and slides along the slide rod 14. The return spring is compressed, which can release the fixation of the insert plate 9. Then, through the arc rod 6 and the collar 7, one of the limiting blocks 8 is moved, pushing the wire harness so that the wire harness is located between the two limiting blocks 8 and is locked in the wire-locking groove 24 on the two limiting blocks 8. At this time, the insert plate 9 is released. Under the action of the return spring, the slide plate 15 can be moved to the initial position, thereby moving the insert plate 9 to the initial position. Then, the insert plate 9 is pushed to make the wire harness move to the initial position. The spring piece 10 installed on the insert plate 9 is reinserted into the corresponding slot 13. During the insertion of the spring piece 10 into the slot 13, the two locking blocks 11 move with the spring piece 10. The inclined surface of the locking block 11 first moves along the inner wall of the slot 13 and is gradually squeezed, causing the spring piece 10 to deform. After the locking block 11 is fully inserted into the slot 13, under the action of the spring piece 10's rebound force, one end of the locking block 11 can be driven into the slot 12, fixing the position of the spring piece 10 in the slot 13, thereby fixing the position of the limiting block 8 and realizing the limiting of the wire harness. Similarly, the next turn of the winding wire harness can be positioned, so that the wire harness wound or inserted on the current transformer can be neatly arranged, avoiding the wire harness from tangling and causing interference.
[0037] The fixed plate 16 has movable grooves 19 on both outer side walls. T-shaped plates 17 are slidably connected inside the two movable grooves 19. A spring plate 18 is installed between one end of the T-shaped plate 17 and the inner wall of the movable groove 19. One end of the spring plate 18 is fixedly connected to the T-shaped plate 17, and the other end of the spring plate 18 is fixedly connected to the inner side wall of the movable groove 19. The vertical groove 22 has fixed grooves 20 on both inner side walls. The fixed grooves 20 fit into one end of the T-shaped plate 17.
[0038] Specifically, the split body 4 is pulled away from the main body 1, causing the arc-shaped positioning plate 21 to move outward from the arc-shaped positioning groove 23, and the fixing plate 16 to move outward from the vertical groove 22. As the fixing plate 16 moves outward from the vertical groove 22, the two T-shaped plates 17 follow the fixing plate 16, causing the inclined surfaces of the T-shaped plates 17 to move along the inner wall of the fixing groove 20. Under the continuous movement of the fixing plate 16, the fixing groove 20 retracts into the movable groove 19, and the spring plate 18 is squeezed, which can release the fixing plate 16. Thus, the fixing plate 16 can be pulled out from the vertical groove 22, thereby releasing the fixation between the split body 4 and the main body 1. At this time, the interior of the main body 1 can be inspected to ensure the normal operation of the core 3. After the inspection is completed, the arc-shaped positioning plate 21 connected to the split body 4 and the fixing plate 1 are similarly connected. 6. Insert the T-shaped plate 17 into the arc-shaped positioning groove 23 and the vertical groove 22 respectively. Similarly, the inclined surface of the T-shaped plate 17 first moves along the inner wall of the vertical groove 22 and gradually retracts into the movable groove 19. The spring plate 18 is squeezed and moved into the movable groove 19. The spring plate 18 is squeezed and retracted until the fixing plate 16 is completely inserted into the vertical groove 22. At this time, under the action of the spring force of the spring plate 18, the T-shaped plate 17 is moved, so that one end of the T-shaped plate 17 is re-inserted into the fixing groove 20. The fixing plate 16 can be re-fixed into the vertical groove 22, thereby re-fixing the split body 4 onto the main body 1. Through the above operation, by setting the split body 4 which is easy to disassemble and assemble, the interior of the main body 1 can be easily inspected, and the position of the iron core 3 that has been displaced can be corrected in time, thereby ensuring the normal operation of the current transformer.
[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.
Claims
1. A current transformer for a molded case circuit breaker, comprising a main body (1), characterized in that, The main body (1) is fixedly connected to the outer wall of the mounting base (2), and the main body (1) is movably installed with the split body (4). The inner wall of the main body (1) is provided with several arc-shaped sliding grooves (5), and an arc-shaped rod (6) is fixedly installed inside each of the arc-shaped sliding grooves (5). Several collars (7) and tension springs are sleeved on the outside of the arc-shaped rods (6). Limit blocks (8) are fixedly connected to the outer walls of each of the collars (7). An iron core (3) is fixedly installed inside the main body (1). The outer wall of the main body (1) is provided with several arc-shaped positioning grooves (23) and vertical grooves (22). An arc-shaped positioning plate (21) is inserted inside the arc-shaped positioning groove (23), and a fixing plate (16) is inserted inside the vertical groove (22). One end of the fixing plate (16) and the arc-shaped positioning groove (23) are fixedly connected to the split body (4).
2. The current transformer for a molded case circuit breaker according to claim 1, characterized in that, The limiting block (8) has wire-locking grooves (24) on both outer side walls, and a plug plate (9) is inserted into one end of the limiting block (8).
3. The current transformer for a molded case circuit breaker according to claim 1, characterized in that, The upper surface of the limiting block (8) is provided with a horizontal groove, and a slide rod (14) is fixedly installed inside the horizontal groove. A slide plate (15) is sleeved on the outside of the slide rod (14), and the bottom end of the slide plate (15) is fixedly connected to the insert plate (9). A return spring is sleeved on the outside of the slide rod (14) and between the inner wall of the horizontal groove and the slide plate (15).
4. The current transformer for a molded case circuit breaker according to claim 2, characterized in that, One end of the insert plate (9) is fixedly connected to a spring piece (10), and both outer walls of the spring piece (10) are fixedly connected to a locking block (11). The inner wall of the main body (1) is provided with several slots (13), and both inner walls of the several slots (13) are provided with a slot (12), and the slot (12) fits into the locking block (11).
5. The current transformer for a molded case circuit breaker according to claim 1, characterized in that, The fixed plate (16) has movable grooves (19) on both outer side walls, and T-shaped plates (17) are slidably connected inside the two movable grooves (19).
6. A current transformer for a molded case circuit breaker according to claim 5, characterized in that, A spring plate (18) is installed between one end of the T-shaped plate (17) and the inner wall of the movable groove (19), and one end of the spring plate (18) is fixedly connected to the T-shaped plate (17), and the other end of the spring plate (18) is fixedly connected to the inner wall of the movable groove (19).
7. A current transformer for a molded case circuit breaker according to claim 6, characterized in that, The vertical groove (22) has a fixing groove (20) on both inner side walls, and the fixing groove (20) is matched with one end of the T-shaped plate (17).