Built-in open circuit prevention current transformer

Abstract

A built-in open-circuit-prevention current transformer belongs to the field of electrical equipment and comprises a current transformer body, a mounting groove, jacks, an instrument plug and pins, the mounting groove is formed in the outer side of one side of the current transformer body, the two jacks are fixedly mounted on the inner wall of the mounting groove, and outer sleeves corresponding to the jacks are fixedly connected to the inner wall of the mounting groove. During detection, the instrument plug is matched with the inclined groove through the sliding rod, so that the clamping block extends out of the fixed contact pin, a double-locking mechanism is automatically formed, axial and lateral movement is prevented, stability is ensured, meanwhile, when the plug is pulled, the trigger block and the sliding block are matched to make a sound for reminding, improper treatment is found in time, and the safety is improved. In addition, in the plugging process, the guide column and the spiral groove drive the cleaning ball to clean the surface of the contact pin and remove an oxide layer and dirt, good electrical contact is ensured, the connection stability and efficiency are improved, and therefore the accuracy and reliability of detection are enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and particularly relates to a built-in open-circuit prevention current transformer. Background Art

[0002] A current transformer is an instrument that measures by converting a large current on the primary side into a small current on the secondary side based on the principle of electromagnetic induction. A current transformer consists of a closed iron core and windings. Its primary side winding has very few turns and is connected in series in the circuit where the current to be measured passes through. Therefore, it often has the full current of the circuit flowing through it. The secondary side winding has relatively more turns and is connected in series in the measuring instrument and the protection circuit. When the current transformer is working, its secondary side circuit is always closed. Therefore, the impedance of the series-connected coil in the measuring instrument and the protection circuit is very small, and the working state of the current transformer is close to a short circuit.

[0003] When a current transformer is applied, it generally includes special requirements for long-term fixed installation scenarios (such as substation metering cabinets) and manual temporary detection scenarios (such as equipment maintenance and power quality analysis). During manual temporary detection, generally, the wire to be measured needs to be passed through the current transformer, and then the positive and negative poles of the detection instrument are respectively connected to the positive and negative jacks of the current transformer to detect the wire to be measured.

[0004] However, in the actual detection process, there is no fixing mechanism between the plug and the wiring hole. Temporary detection often occurs in complex working condition environments (such as equipment vibration and personnel movement disturbance). When the plug is pulled by an external force, it is easy to loosen, have a virtual connection or even break away. In case of an emergency, it is difficult for personnel to intervene in time, which will increase the contact resistance between the plug and the wiring hole. This increased contact resistance will cause a high voltage to be generated on the secondary side, which will not only damage the current transformer and the measuring instrument and protection equipment connected to it, but also may cause potential safety hazards. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that it is difficult for detection personnel to intervene in time due to the loosening or detachment of the plug in the prior art, and to propose a built-in open-circuit prevention current transformer.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solution:

[0007] A built-in open-circuit prevention current transformer includes a current transformer main body, an installation groove, jacks, an instrument plug, and pins. The installation groove is opened on the outer side of one side of the current transformer main body. Two of the jacks are fixedly installed on the inner wall of the installation groove, and an outer sleeve is fixedly connected to the inner wall of the installation groove corresponding to the jacks. The outer sleeve is sleeved outside the jacks;

[0008] The outer wall of the outer sleeve is provided with an insertion anti - detachment mechanism, so that when plugging in, a double - locking mechanism can be applied to the instrument plug, effectively resisting the axial force and lateral force of the instrument plug;

[0009] The inner wall of the installation groove is provided with a loosening reminder mechanism, so that when the plugging is completed, a sound reminder can be given for the force - induced loosening of the instrument plug, timely reminding the tester to observe the plugging situation;

[0010] One end of the outer sleeve is provided with a dynamic cleaning mechanism, so that when plugging in, the oxide layer, dirt and other impurities on the surface of the pin can be removed, ensuring good electrical contact.

[0011] Furthermore, the insertion anti - detachment mechanism includes a positioning plate, and a sliding cylinder is rotatably connected to the outer wall of one side of the positioning plate. A sliding rod is slidably connected to the inside of the end of the sliding cylinder away from the positioning plate. A straight groove is opened on the outer wall of the outer sleeve corresponding to the sliding rod, and the bottom of the sliding rod is slidably connected to the inner wall of the straight groove. A supporting arc plate is fixedly connected to the inner wall of the installation groove corresponding to the sliding cylinder, and the inner wall of the supporting arc plate is in sliding fit with the outer wall of the sliding cylinder. An inclined groove is opened on the outer wall of the outer sleeve corresponding to the straight groove, and an anti - detachment groove is opened on the outer wall of the outer sleeve corresponding to the inclined groove. An elastic rubber block is fixedly connected to the inner wall of the anti - detachment groove.

[0012] Furthermore, a positioning hole is opened through the center of the positioning plate corresponding to the pin, and sliding grooves are symmetrically opened on the inner wall of the positioning hole. A clamping block is slidably connected to the inner wall of the sliding groove in a fitting manner, and a connecting column is fixedly connected to the outer wall of the clamping block facing the sliding cylinder. A limiting groove is opened on the outer wall of the positioning plate facing the sliding cylinder corresponding to the connecting column, and the outer wall of the connecting column is in sliding fit with the inner wall of the limiting groove.

[0013] Furthermore, a guiding groove is opened at the end of the sliding cylinder facing the positioning plate, and the outer wall of the connecting column is in sliding fit with the inner wall of the guiding groove. The inner wall of the guiding groove is elliptical. A support rod is fixedly connected to the outer wall of the positioning plate facing the sliding cylinder, and the outer wall of the support rod is in sliding fit with the inner wall of the supporting arc plate. A first spring is fixedly connected to the inner wall of the limiting groove, and the end of the first spring away from the pin is fixedly connected to the outer wall of the connecting column. A trigger block is fixedly connected to the end of the sliding rod away from the outer sleeve, and a tension spring is arranged in a fitting manner on the outer wall of the sliding rod. One end of the tension spring is fixedly connected to the outer wall of the sliding cylinder, and the end of the tension spring away from the outer sleeve is fixedly connected to the bottom of the trigger block.

[0014] Furthermore, the loosening reminder mechanism includes a housing, and one end of the housing is fixedly connected to the inner wall of the installation groove. A circulation groove is formed in one end of the housing, and a slider is slidably connected to the inner wall of the circulation groove in a fitting manner. A groove is formed in the top of the slider, and a second spring is fixedly connected to the inner wall of the groove. The top of the second spring is fixedly connected to a clamping block. A through hole is formed in the top of the housing corresponding to the penetration of the clamping block, and the top of the clamping block is inclined corresponding to the trigger block. One outer wall of the slider is fixedly connected to a connecting rod, and one end of the connecting rod away from the slider passes through the interior of the housing and extends to the outside. The extending end of the connecting rod is fixedly connected to a connecting ring plate.

[0015] Furthermore, a third spring is arranged in a fitting manner on the outer wall of the extending end of the connecting rod, and one end of the third spring is fixedly connected to one end of the housing facing the connecting ring plate. The other end of the third spring away from the housing is fixedly connected to one end face of the connecting ring plate. An air outlet hole is formed in the top of the housing, and the inner wall edge of the air outlet hole is serrated. One bottom end of the housing is semicircular, and a rolling ball is correspondingly arranged on the inner wall of the circulation groove.

[0016] Furthermore, the dynamic cleaning mechanism includes a mounting disc, and a through hole is formed through the center of the interior of the mounting disc. Cleaning balls are fixedly connected to the inner wall of the through hole at equal intervals, and the cleaning balls are made of rubber material. Guide columns are fixedly connected to the outer wall of the mounting disc. A spiral groove is formed in the inner wall of the sliding cylinder corresponding to the guide columns, and one end of the guide column away from the mounting disc is slidably connected to the inner wall of the spiral groove in a fitting manner.

[0017] Furthermore, fixing rods are symmetrically and fixedly connected to one end face of the mounting disc away from the positioning plate, and one end of the fixing rod away from the mounting disc is fixedly connected to a connecting rotating ring. One end face of the connecting rotating ring away from the mounting disc is rotatably connected to one end face of the outer sleeve. Discharge holes are formed through the outer wall of the sliding cylinder, and the number of the discharge holes is several.

[0018] Compared with the prior art, the above scheme has the following beneficial effects:

[0019] 1. During the detection, when inserting the instrument plug, through the cooperation of the sliding rod and the inclined groove, the two clamping blocks located in the positioning holes can extend to fit and fix the plug pins. At the same time, when the insertion is completed, through the cooperation of the inclined groove and the anti - detachment groove, the movement of the instrument plug can be automatically restricted, forming a double - locking mechanism. This not only prevents the axial movement of the plug, but also can effectively resist the lateral force, avoiding the situation of the instrument plug loosening, having loose connections or even detaching, and ensuring the stability of the plug during the detection process.

[0020] 2. During detection, when the plug is pulled, through the cooperation of the trigger block and the slider, the slider can move quickly in the flow channel, so as to push the air flow out of the air outlet hole to make a sound, timely reminding the detector to observe the plug insertion situation, enabling the detector to immediately realize the improper handling that the plug may be subjected to, and reducing equipment damage or data loss caused by negligence or misoperation.

[0021] 3. During detection, during the insertion process, through the cooperation of the guide post and the spiral groove, multiple cleaning balls can be used to clean the surface of the pin, effectively removing the oxide layer, dirt and other impurities on the surface of the pin, ensuring good electrical contact. The surface of the cleaned pin is smoother, reducing the contact resistance, improving the stability and efficiency of subsequent electrical connections, and thus enhancing the accuracy and reliability of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. is a schematic three-dimensional structure diagram of the whole of an internally-mounted open-circuit prevention current transformer proposed by the present invention;

[0023] Figure 2 FIG. is a schematic partial three-dimensional structure diagram of the whole of an internally-mounted open-circuit prevention current transformer proposed by the present invention;

[0024] Figure 3 FIG. is a schematic three-dimensional structure diagram inside the sliding cylinder of an internally-mounted open-circuit prevention current transformer proposed by the present invention;

[0025] Figure 4 FIG. is a schematic three-dimensional structure diagram of the first part of the insertion anti-loosening mechanism of an internally-mounted open-circuit prevention current transformer proposed by the present invention;

[0026] Figure 5 FIG. is a schematic three-dimensional structure diagram of the second part of the insertion anti-loosening mechanism of an internally-mounted open-circuit prevention current transformer proposed by the present invention;

[0027] Figure 6 FIG. is a schematic three-dimensional structure diagram of the loosening reminder mechanism of an internally-mounted open-circuit prevention current transformer proposed by the present invention;

[0028] Figure 7 FIG. is a schematic three-dimensional structure diagram of the dynamic cleaning mechanism of an internally-mounted open-circuit prevention current transformer proposed by the present invention.

[0029] In the figure: 1. Current transformer main body; 2. Installation groove; 3. Jack; 4. Outer sleeve; 8. Support arc plate; 9. Instrument plug; 10. Pin; 5. Insertion anti - detachment mechanism; 501. Positioning plate; 502. Sliding cylinder; 503. Slide bar; 504. Straight groove; 505. Inclined groove; 506. Anti - detachment groove; 507. Elastic rubber block; 508. Positioning hole; 509. Chute; 510. Clamping block; 511. Connecting column; 512. Limiting groove; 513. Guide groove; 514. Support rod; 515. Spring 1; 516. Trigger block; 517. Pull spring; 6. Loosening reminder mechanism; 601. Housing; 602. Flow - through groove; 603. Slide block; 604. Groove; 605. Spring 2; 606. Clamping block; 607. Through - port; 608. Connecting rod; 609. Connecting ring plate; 610. Spring 3; 611. Air outlet hole; 612. Ball; 7. Dynamic cleaning mechanism; 701. Installation disc; 702. Through - hole; 703. Cleaning ball; 704. Guide post; 705. Spiral groove; 706. Fixed rod; 707. Connecting rotating ring; 708. Slag discharge hole. Detailed implementation mode

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top surface", "bottom surface", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated position or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish an entity or operation from another entity or operation, and do not require or imply any actual relationship, order or relative importance between these entities or operations.

[0032] Embodiment 1:

[0033] Refer to Figures 1-7 , an open - circuit - proof built - in current transformer, including a current transformer main body 1, an installation groove 2, a jack 3, an instrument plug 9, and a pin 10. The installation groove 2 is opened on the outer side of one side of the current transformer main body 1. Two jacks 3 are fixedly installed on the inner wall of the installation groove 2, and an outer sleeve 4 is fixedly connected to the inner wall of the installation groove 2 corresponding to the jack 3. The outer sleeve 4 is sleeved outside the jack 3;

[0034] Further, an insertion anti - detachment mechanism 5 is provided on the outer wall of the outer sleeve 4. The insertion anti - detachment mechanism 5 includes a positioning plate 501, and a sliding cylinder 502 is rotatably connected to the outer wall of one side of the positioning plate 501. A sliding rod 503 is slidably connected to the inner end of the sliding cylinder 502 away from the positioning plate 501. A straight groove 504 is provided on the outer wall of the outer sleeve 4 corresponding to the sliding rod 503, and the bottom of the sliding rod 503 is slidably connected to the inner wall of the straight groove 504. A supporting arc plate 8 is fixedly connected to the inner wall of the installation groove 2 corresponding to the sliding cylinder 502, and the inner wall of the supporting arc plate 8 is in sliding fit with the outer wall of the sliding cylinder 502. An inclined groove 505 is provided on the outer wall of the outer sleeve 4 corresponding to the straight groove 504, and an anti - detachment groove 506 is provided on the outer wall of the outer sleeve 4 corresponding to the inclined groove 505. An elastic rubber block 507 is fixedly connected to the inner wall of the anti - detachment groove 506;

[0035] In the embodiment, when the current transformer main body 1 is used, first, the wire to be measured is passed through the center of the current transformer main body 1, and then the positive and negative plugs of the detection instrument are respectively inserted into the positive and negative jacks 3 of the current transformer main body 1 to detect the wire to be measured;

[0036] Then, during the insertion process, first, the pin 10 at the front end of the instrument plug 9 is passed through the positioning hole 508 in the positioning plate 501, so that the front - end surface of the instrument plug 9 is in contact with one side surface of the positioning plate 501. Then, the instrument plug 9 is continuously pushed to drive the positioning plate 501 to move. Then, since a sliding cylinder 502 is rotatably connected to the outer wall of one side of the positioning plate 501, a sliding rod 503 is slidably connected to the inner end of the sliding cylinder 502 away from the positioning plate 501, and a straight groove 504 is provided on the outer wall of the outer sleeve 4 corresponding to the sliding rod 503, the sliding cylinder 502 can be moved. When the bottom of the sliding rod 503 slides to the end of the straight groove 504, at this time, since an inclined groove 505 is provided on the outer wall of the outer sleeve 4 corresponding to the straight groove 504, the sliding cylinder 502 is rotated under the guidance of the inclined groove 505 and finally rotates by ninety degrees;

[0037] During the rotation of the sliding cylinder 502, symmetrically arranged chutes 509 are provided on the inner wall of the positioning hole 508, and clamping blocks 510 are slidably connected to the inner wall of the chutes 509 in a fitting manner. A connecting column 511 is fixedly connected to the outer wall of one side of the clamping block 510 facing the sliding cylinder 502. At the same time, a limiting groove 512 is provided on the outer wall of the positioning plate 501 facing the sliding cylinder 502 corresponding to the connecting column 511, and the outer wall of the connecting column 511 is in sliding fit with the inner wall of the limiting groove 512. One end of the sliding cylinder 502 facing the positioning plate 501 is provided with a guiding groove 513, and the outer wall of the connecting column 511 is in sliding fit with the inner wall of the guiding groove 513. The inner wall of the guiding groove 513 is elliptical, and a first spring 515 is fixedly connected to the inner wall of the limiting groove 512. At the same time, the end of the first spring 515 away from the insertion pin 10 is fixedly connected to the outer wall of the connecting column 511. Thus, under normal circumstances, restricted by the elastic force of the first spring 515, the two clamping blocks 510 do not contact the insertion pin 10, and at this time, the connecting column 511 will be located within the minimum included angle of the guiding groove 513. When the sliding cylinder 502 rotates, since the guiding groove 513 is elliptical, the inner wall of the guiding groove 513 can be used to squeeze the two connecting columns 511, so that the two connecting columns 511 approach each other, and thus the two clamping blocks 510 can be synchronously driven to squeeze and fix the insertion pin 10, so that during the rotation of the sliding cylinder 502, the instrument plug 9 is connected and fixed to the positioning plate 501;

[0038] Then, a support rod 514 is fixedly connected to the outer wall of the positioning plate 501 facing the sliding cylinder 502, and the outer wall of the support rod 514 is in sliding fit with the inner wall of the support arc plate 8. At the same time, a support arc plate 8 is fixedly connected to the inner wall of the installation groove 2 corresponding to the sliding cylinder 502, and the inner wall of the support arc plate 8 is in sliding fit with the outer wall of the sliding cylinder 502. Thus, the positioning plate 501 can be supported and restricted to prevent the positioning plate 501 from rotating and ensure the stability of the sliding cylinder 502 during the sliding process;

[0039] Next, an anti - detachment groove 506 is provided on the outer wall of the outer sleeve 4 corresponding to the inclined groove 505. An elastic rubber block 507 is fixedly connected to the inner wall of the anti - detachment groove 506. The inner wall depth of the anti - detachment groove 506 is greater than that of the inclined groove 505. At the same time, a trigger block 516 is fixedly connected to the end of the slide rod 503 away from the outer sleeve 4. A tension spring 517 is fitted on the outer wall of the slide rod 503. One end of the tension spring 517 is fixedly connected to the outer wall of the sliding cylinder 502, and the other end of the tension spring 517 away from the outer sleeve 4 is fixedly connected to the bottom of the trigger block 516. Thus, when the slide rod 503 slides to the end of the inclined groove 505, at this time, the instrument plug 9 and the positioning plate 501 have been connected and fixed. At this time, continue to push the instrument plug 9, so that the slide rod 503 will slide out from the end of the inclined groove 505, and driven by the elastic force of the tension spring 517, it will be inserted into the anti - detachment groove 506. At this time, because the inner wall depth of the anti - detachment groove 506 is greater than that of the inclined groove 505, the reverse rotation of the sliding cylinder 502 is automatically restricted. At the same time, the setting of the elastic rubber block 507 resists the backward movement of the sliding cylinder 502, forming a double - locking mechanism, which not only prevents the axial movement of the instrument plug 9, but also can effectively resist lateral forces, avoiding the situation that the instrument plug 9 loosens, has poor contact or even detaches, ensuring the stability of the instrument plug 9 during the detection process;

[0040] Then, when the measurement is completed, just manually pull the trigger block 516 outwards to drive the slide rod 503 to disengage from the anti - detachment groove 506. At this time, reverse - rotate the sliding cylinder 502 to release the fixation of the insertion pin 10, then pull the sliding cylinder 502 back to its original position, and finally use the tension spring 517 to drive the slide rod 503 to re - insert into the straight groove 504.

[0041] Furthermore, a loosening reminder mechanism 6 is provided on the inner wall of the installation groove 2. The loosening reminder mechanism 6 includes a housing 601. One end of the housing 601 is fixedly connected to the inner wall of the installation groove 2. A flow - through groove 602 is provided at one end of the housing 601. A slider 603 is fitted and slidably connected to the inner wall of the flow - through groove 602. A groove 604 is provided at the top of the slider 603. A second spring 605 is fixedly connected to the inner wall of the groove 604. A clamping block 606 is fixedly connected to the top of the second spring 605. A through - hole 607 is provided on the top of the housing 601 corresponding to the penetration of the clamping block 606. The top of the clamping block 606 is in an inclined shape corresponding to the trigger block 516. A connecting rod 608 is fixedly connected to the outer wall of one side of the slider 603. The end of the connecting rod 608 away from the slider 603 passes through the inside of the housing 601 and extends to the outside. A connecting ring plate 609 is fixedly connected to the extending end of the connecting rod 608;

[0042] In an embodiment, under normal circumstances, the connecting ring plate 609 is manually pushed, so that the slider 603 moves within the flow groove 602 until the clamping block 606 is aligned with the through port 607. Then, driven by the second spring 605, the clamping block 606 extends into the through port 607 to fix the current position of the slider 603. When the instrument plug 9 is inserted, since the sliding cylinder 502 has completed a 90-degree rotation at this time, the trigger block 516 rotates to the top of the housing 601 accordingly and contacts the clamping block 606. When the instrument plug 9 is subjected to a slight axial pulling force, it can only move slightly under the restriction of the elastic rubber block 507 at this time, without triggering an alarm. When the instrument plug 9 is subjected to a severe axial pulling force, the elastic rubber block 507 will be significantly deformed due to extrusion at this time, that is, the trigger block 516 will contact and squeeze the clamping block 606, causing the clamping block 606 to be pressed into the groove 604. At this time, a third spring 610 is attached to the outer wall of the extended end of the connecting rod 608, and one end of the third spring 610 is fixedly connected to one end of the housing 601 facing the connecting ring plate 609, and the end of the third spring 610 away from the housing 601 is fixedly connected to one end face of the connecting ring plate 609. Thus, the slider 603 can be quickly displaced and returned within the flow groove 602 by the elastic force of the third spring 610 to squeeze and push the air in the flow groove 602;

[0043] At this time, an air outlet hole 611 is opened at the top of the housing 601, and the inner wall edge of the air outlet hole 611 is serrated. One end of the bottom of the housing 601 is semicircular. At the same time, a rolling ball 612 is correspondingly arranged on the inner wall of the flow groove 602. Thus, by using the principle of a whistle, the air flow can flow out from the air outlet hole 611 to make a sound, so as to timely remind the tester to observe the insertion situation of the instrument plug 9, enabling the tester to immediately realize the improper handling that the instrument plug 9 may be subjected to, and reducing equipment damage or data loss caused by negligence or misoperation.

[0044] Furthermore, a dynamic cleaning mechanism 7 is arranged at one end of the outer sleeve 4. The dynamic cleaning mechanism 7 includes a mounting plate 701, and a through hole 702 is axially penetrated through the center of the mounting plate 701. Cleaning balls 703 are fixedly connected to the inner wall of the through hole 702 at equal intervals, and the cleaning balls 703 are made of rubber. Guide posts 704 are fixedly connected to the outer wall of the mounting plate 701. A spiral groove 705 is opened on the inner wall of the sliding cylinder 502 corresponding to the guide posts 704, and the end of the guide post 704 away from the mounting plate 701 is in sliding contact with the inner wall of the spiral groove 705;

[0045] In an embodiment, during the insertion process, first, a through hole 702 is formed through the inner center of the mounting disk 701, and cleaning balls 703 are fixedly connected to the inner wall of the through hole 702 at equal intervals. The cleaning balls 703 are made of rubber. At the same time, fixing rods 706 are symmetrically and fixedly connected to one end surface of the mounting disk 701 away from the positioning plate 501. One end of the fixing rod 706 away from the mounting disk 701 is fixedly connected with a connecting rotating ring 707, and one end surface of the connecting rotating ring 707 away from the mounting disk 701 is rotatably connected to one end surface of the outer sleeve 4. Thus, the mounting disk 701 can be supported, and driven by the positioning plate 501, the insertion pin 10 can accurately pass through the through hole 702. At this time, the surface of the insertion pin 10 can be cleaned by the plurality of cleaning balls 703;

[0046] Then, a guide post 704 is fixedly connected to the outer wall of the mounting disk 701, and a spiral groove 705 is formed in the inner wall of the sliding cylinder 502 corresponding to the guide post 704. One end of the guide post 704 away from the mounting disk 701 is slidably attached to the inner wall of the spiral groove 705. Thus, during the process of pushing the instrument plug 9, through the cooperation of the spiral groove 705 and the guide post 704, the plurality of cleaning balls 703 can rotate and move around the insertion pin 10, increasing the cleaning area, effectively removing the oxide layer, dirt, and other impurities on the surface of the insertion pin 10, ensuring good electrical contact. The surface of the cleaned insertion pin 10 is smoother, reducing the contact resistance, improving the stability and efficiency of subsequent electrical connections, and thus enhancing the accuracy and reliability of detection;

[0047] Then, a plurality of slag discharge holes 708 are formed through the outer wall of the sliding cylinder 502. During the cleaning process, through the rotation of the plurality of slag discharge holes 708 and the sliding cylinder 502 itself, the residues generated by the cleaning can be discharged to the outside through the slag discharge holes 708, preventing the residues generated after cleaning from accidentally entering the jack 3.

[0048] The working principle of the present invention: During the insertion process, first, the insertion pin 10 at the front end of the instrument plug 9 passes through the positioning hole 508 in the positioning plate 501, so that the front surface of the instrument plug 9 is in contact with one side surface of the positioning plate 501. Then, continue to push the instrument plug 9 to drive the positioning plate 501 to move. When the bottom of the sliding rod 503 slides to the end of the straight groove 504, under the guidance of the inclined groove 505, the sliding cylinder 502 will rotate and finally rotate by ninety degrees;

[0049] Next, during the rotation of the sliding cylinder 502, since the guiding groove 513 is elliptical, the inner walls of the guiding groove 513 can be used to squeeze the two connecting columns 511, causing the two connecting columns 511 to approach each other, so as to synchronously drive the two clamping blocks 510 to squeeze and fix the insertion pin 10. During the rotation of the sliding cylinder 502, the instrument plug 9 is connected and fixed to the positioning plate 501;

[0050] Next, when the sliding rod 503 slides to the end of the inclined groove 505, at this time, the instrument plug 9 has been connected and fixed to the positioning plate 501. At this time, continue to push the instrument plug 9, so that the sliding rod 503 will slide out from the end of the inclined groove 505 and, driven by the elastic force of the tension spring 517, will be inserted into the anti - detachment groove 506. At this time, since the inner wall depth of the anti - detachment groove 506 is greater than the inner wall depth of the inclined groove 505, the reverse rotation of the sliding cylinder 502 is automatically restricted. At the same time, the setting of the elastic rubber block 507 resists the retraction of the sliding cylinder 502, forming a double - locking mechanism, which not only prevents the axial movement of the instrument plug 9 but also effectively resists lateral forces;

[0051] When the instrument plug 9 is completely inserted, since the sliding cylinder 502 has completed a 90 - degree rotation at this time, the trigger block 516 will rotate to the top of the housing 601 accordingly, and the trigger block 516 contacts the locking block 606. When the instrument plug 9 is slightly axially pulled, under the restriction of the elastic rubber block 507 at this time, it can only move slightly and does not trigger an alarm. When the instrument plug 9 is severely axially pulled, at this time, the elastic rubber block 507 will be significantly deformed due to extrusion, that is, the trigger block 516 will contact and squeeze the locking block 606, causing the locking block 606 to be pressed into the groove 604. Thus, the slider 603 can be driven by the elastic force of the spring three 610 to quickly displace and return in the flow - through groove 602, squeezing and pushing the air in the flow - through groove 602;

[0052] So that the air flow flows out from the air outlet hole 611 to make a sound, thus being able to timely remind the tester to observe the insertion situation of the instrument plug 9, enabling the tester to immediately realize the improper handling that the instrument plug 9 may be subjected to;

[0053] Next, during the insertion process, driven by the positioning plate 501, the insertion pin 10 will accurately pass through the through - hole 702. At this time, the surface of the insertion pin 10 can be cleaned by multiple cleaning balls 703. During the process of pushing the instrument plug 9, through the cooperation of the spiral groove 705 and the guide post 704, the multiple cleaning balls 703 will rotate and move around the insertion pin 10, increasing the cleaning area, effectively removing the oxide layer, dirt and other impurities on the surface of the insertion pin 10. Then, during the cleaning process, through the multiple slag - discharging holes 708 and the rotation of the sliding cylinder 502 itself, the residues generated by the cleaning can be discharged from the slag - discharging holes 708 to the outside, preventing the residues generated after cleaning from accidentally entering the jack 3.

[0054] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A built-in open circuit protection current transformer, comprising a current transformer body (1), a mounting slot (2), a jack (3), an instrument plug (9), and a pin (10), characterized in that: The mounting groove (2) is provided on the outside of one side of the current transformer body (1); the two plug holes (3) are fixedly mounted on the inner wall of the mounting groove (2); and the inner wall of the mounting groove (2) is fixedly connected to an outer sleeve (4) corresponding to the plug holes (3); and the outer sleeve (4) is sleeved on the outside of the plug holes (3); The outer wall of the outer sleeve (4) is provided with an insertion anti-drop mechanism (5) so as to perform a double locking mechanism on the instrument plug (9) during insertion to resist the axial force and lateral force of the instrument plug (9); The inner wall of the installation groove (2) is provided with a loosening reminder mechanism (6) to give a sound reminder of the loosening of the instrument plug (9) when the plugging is completed; One end of the outer sleeve (4) is provided with a dynamic cleaning mechanism (7) to remove the oxide layer and dirt on the surface of the pin (10).

2. A built-in open circuit protection current transformer according to claim 1, characterized in that: The insertion anti-slip mechanism (5) comprises a positioning plate (501), and a slide cylinder (502) is rotatably connected to an outer wall of one side of the positioning plate (501), and a slide rod (503) is slidably connected to the inner side of the slide cylinder (502) away from the positioning plate (501), and a straight groove (504) is formed on the outer wall of the outer sleeve (4) corresponding to the slide rod (503), and the bottom of the slide rod (503) is slidably connected to the inner wall of the straight groove (504), and the mounting groove The inner wall of the outer sleeve (2) corresponds to the slide cylinder (502) and is fixedly connected to a supporting arc plate (8), and the inner wall of the supporting arc plate (8) slides in contact with the outer wall of the slide cylinder (502), the outer wall of the outer sleeve (4) corresponds to the straight groove (504) and is provided with an oblique groove (505), and the outer wall of the outer sleeve (4) corresponds to the oblique groove (505) and is provided with an anti-slip groove (506), and the inner wall of the anti-slip groove (506) is fixedly connected to an elastic rubber block (507).

3. A built-in open circuit protection current transformer according to claim 2, characterized in that: A positioning hole (508) is provided in the inner center of the positioning plate (501) corresponding to the insertion pin (10), and a slide groove (509) is symmetrically provided on the inner wall of the positioning hole (508). A clamping block (510) is slidably connected to the inner wall of the slide groove (509), and a connecting column (511) is fixedly connected to the outer wall of the clamping block (510) on one side facing the slide cylinder (502). A limiting groove (512) is provided on the outer wall of the positioning plate (501) on one side facing the slide cylinder (502) corresponding to the connecting column (511), and the outer wall of the connecting column (511) is slidably fitted with the inner wall of the limiting groove (512).

4. A built-in open circuit protection current transformer according to claim 3, characterized in that: A guide groove (513) is provided at one end of the slide cylinder (502) facing the positioning plate (501), and the outer wall of the connecting column (511) fits and slides with the inner wall of the guide groove (513), and the inner wall of the guide groove (513) is elliptical. A support rod (514) is fixedly connected to the outer wall of one side of the positioning plate (501) facing the slide cylinder (502), and the outer wall of the support rod (514) fits and slides with the inner wall of the supporting arc plate (8), and the inner wall of the limiting groove (512) is fixedly connected to a spring. (515), and one end of the spring (515) away from the pin (10) is fixedly connected to the outer wall of the connecting column (511), one end of the sliding rod (503) away from the outer sleeve (4) is fixedly connected to the trigger block (516), and a tension spring (517) is provided on the outer wall of the sliding rod (503), one end of the tension spring (517) is fixedly connected to the outer wall of the sliding cylinder (502), and one end of the tension spring (517) away from the outer sleeve (4) is fixedly connected to the bottom of the trigger block (516).

5. A built-in open circuit protection current transformer according to claim 4, characterized in that: The loosening reminder mechanism (6) comprises a shell (601), and one end of the shell (601) is fixedly connected to the inner wall of the installation groove (2), one end of the shell (601) is provided with a circulation groove (602), and the inner wall of the circulation groove (602) is slidably connected with a slider (603), the top of the slider (603) is provided with a groove (604), and the inner wall of the groove (604) is fixedly connected with a spring 2 (605), and the top of the spring 2 (605) is fixedly connected with A card block (606), a through opening (607) is formed through the top of the shell (601) corresponding to the card block (606), and the top of the card block (606) corresponds to the trigger block (516) and is in an inclined shape, a connecting rod (608) is fixedly connected to an outer wall of one side of the slider (603), and an end of the connecting rod (608) away from the slider (603) extends through the interior of the shell (601) to the outside, and the extended end of the connecting rod (608) is fixedly connected to a connecting ring plate (609).

6. A built-in open circuit protection current transformer according to claim 5, characterized in that: A spring three (610) is fitted on the outer wall of the extended end of the connecting rod (608), and one end of the spring three (610) is fixedly connected to one end of the shell (601) facing the connecting ring plate (609), and one end of the spring three (610) away from the shell (601) is fixedly connected to one end surface of the connecting ring plate (609). An air outlet hole (611) is provided on the top of the shell (601), and the inner wall edge of the air outlet hole (611) is serrated. The bottom of one end of the shell (601) is semicircular, and a rolling ball (612) is correspondingly provided on the inner wall of the circulation groove (602).

7. A built-in open circuit protection current transformer according to claim 6, characterized in that: The dynamic cleaning mechanism (7) comprises a mounting plate (701), and a through hole (702) is provided through the inner center of the mounting plate (701), cleaning balls (703) are fixedly connected to the inner wall of the through hole (702) at equal distances, and the cleaning balls (703) are made of rubber, and a guide column (704) is fixedly connected to the outer wall of the mounting plate (701), and a spiral groove (705) is provided on the inner wall of the slide cylinder (502) corresponding to the guide column (704), and one end of the guide column (704) away from the mounting plate (701) slides in contact with the inner wall of the spiral groove (705).

8. A built-in open circuit protection current transformer according to claim 7, characterized in that: One end face of the mounting plate (701) away from the positioning plate (501) is symmetrically fixedly connected to a fixing rod (706), and one end of the fixing rod (706) away from the mounting plate (701) is fixedly connected to a connecting swivel (707), and one end face of the connecting swivel (707) away from the mounting plate (701) is rotatably connected to one end face of the outer sleeve (4), and the outer wall of the slide cylinder (502) is correspondingly penetrated with slag discharge holes (708), and the number of slag discharge holes (708) is multiple.

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