An open-close type current transformer

Abstract

The utility model relates to a mutual inductor field, concretely relates to a kind of open-close type current transformer, including upper shell and lower shell, the opposite end of upper shell is equipped with two connecting plates, connecting plate extends downward and the inside of two connecting plates is equipped with the pivot of coaxial arrangement respectively, the opposite two side walls of lower shell are equipped with the mounting hole matched with corresponding pivot respectively;The end of lower shell away from pivot is fixedly installed with the elastic buckle plate extending upward, upper shell is equipped with clamping block, and the clamping groove for clamping block is equipped on elastic buckle plate, when upper shell and lower shell are closed, clamping block is clamped into clamping groove and limit upper shell and lower shell relative rotation;By poking elastic buckle plate and making clamping block separate from clamping groove, then upper shell and lower shell can be relatively rotated, so that the end of upper shell and lower shell is separated;Conversely, upper shell and lower shell are closed together, by the clamping groove of clamping block clamped into, so as to limit the relative rotation separation of upper shell and lower shell.

Description

Technical Field

[0001] This utility model relates to the field of current transformers, specifically to an openable current transformer. Background Technology

[0002] In the prior art, utility model patent application number CN202122686123.3 discloses an openable residual current transformer, including a housing assembly, a fixing structure at the lower end of the housing assembly, an external component at the top of the housing assembly, and a magnetic core device inside the housing assembly; the housing assembly includes an upper outer shell, a lower outer shell at the lower end of the upper outer shell, each set of connectors is fixed to the bottom of the upper outer shell, each set of connectors is configured to extend vertically downward, the upper outer shell is inserted and installed on the lower outer shell through the connectors, a hand-tightening screw is inserted at the lower end of the housing assembly, and a hand-tightening nut is screwed onto the end of the hand-tightening screw.

[0003] After the upper and lower housings of the aforementioned current transformer are connected, the upper and lower housings need to be fixed with hand-tightened screws, which is a cumbersome operation and makes the installation of the current transformer time-consuming and labor-intensive. Utility Model Content

[0004] The purpose of this utility model is to provide an openable current transformer with an upper and lower housing that is easy to open and close for installation, so as to solve the defects mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A retractable current transformer includes an upper housing and a lower housing located below the upper housing. Semi-circular iron cores are installed inside the upper housing and the lower housing, respectively. The bottom of the upper housing and the top of the lower housing each have openings for the two ends of the corresponding iron cores to protrude. Two connecting plates are positioned opposite each other at one end of the upper housing. The connecting plates extend downwards, and coaxially arranged rotating shafts are located on the inner sides of the two connecting plates. Mounting holes matching the corresponding rotating shafts are located on opposite side walls of the lower housing. An upwardly extending elastic buckle plate is fixedly installed at the end of the lower housing away from the rotating shafts. A locking block is provided on the upper housing, and the elastic buckle plate has a slot for the locking block to engage. When the upper housing and the lower housing are closed, the locking block engages in the slot and restricts relative rotation between the upper housing and the lower housing.

[0006] As a further improvement, the lower housing is provided with two upwardly extending positioning plates at the end away from the rotating shaft. When the upper housing and the lower housing are closed, the end of the upper housing away from the rotating shaft is inserted between the two positioning plates.

[0007] As a further improvement, the upper housing is provided with a locking block, the locking block is provided with a first lead-sealing hole, and the elastic buckle is provided with a second lead-sealing hole. When the locking block is inserted into the slot, the first lead-sealing hole and the second lead-sealing hole are aligned.

[0008] As a further improvement, an output terminal is installed on the top of the upper housing; the mounting hole connects to the inner cavity of the lower housing; the rotating shaft is provided with a wire-passing hole that connects to the inner cavity of the lower housing at one end; and a wire-passing groove is provided on the inner wall of the upper housing, the wire-passing groove connecting the wire-passing hole and the inner cavity of the upper housing.

[0009] As a further improvement, the outer side of the iron core is covered with a skeleton, and springs are respectively connected between the inner side of the top wall of the upper shell and the corresponding skeleton, and between the inner side of the bottom wall of the lower shell and the corresponding skeleton.

[0010] As a further improvement, the inner wall of the opening is provided with a vertically extending guide groove, and the corresponding skeleton is provided with a guide protrusion that matches the guide groove.

[0011] As a further improvement, a hook is movably mounted on the upper housing. The hook includes a push rod and an insert rod that are parallel to each other, and a connecting part connecting one end of the push rod and the insert rod. A support is provided on the upper housing. The push rod is slidably mounted on the support along the axial direction of the first lead-sealed hole. When the first lead-sealed hole is aligned with the second lead-sealed hole, the insert rod is inserted into the first lead-sealed hole and the second lead-sealed hole to limit the bending of the elastic buckle plate and cause the locking block to disengage from the locking groove.

[0012] As a further improvement, a button is fixedly installed at the end of the push rod away from the connecting part, and an anti-disengagement spring is sleeved on the push rod located between the support and the button.

[0013] Compared with the prior art, the beneficial effects of this utility model are: By moving the elastic buckle plate, the locking block is disengaged from the slot, and then the upper and lower housings can be rotated relative to each other, separating one end of the upper and lower housings; conversely, the upper and lower housings are closed together, and the locking block is inserted into the slot of the elastic buckle plate, thereby restricting the relative rotation and separation of the upper and lower housings, making it convenient to open and close the upper and lower housings and to facilitate the installation of the current transformer. By setting a first lead-sealing hole and a second lead-sealing hole, when the card block is inserted into the card slot, steel wire lead seals are installed in the first lead-sealing hole and the second lead-sealing hole, thereby preventing unauthorized personnel from opening the upper and lower shells abnormally, thus improving safety. By setting a wire-passing hole and a wire-passing groove at the rotating shaft, it is convenient to pass the secondary winding lead wire on the iron core inside the lower housing through the wire-passing hole and the wire-passing groove to the upper housing and connect it to the output terminal. By installing springs inside the upper and lower housings, the springs can make the upper and lower iron cores fit tightly together when the upper and lower housings are closed. By setting vertically extending guide grooves on the inner wall of the opening, circumferential deflection of the iron core is prevented, thus preventing misalignment when the upper and lower iron cores are fitted together. By setting hooks, when the current transformer is used in a closed location or a relatively safe environment, insert rods are inserted into the first and second lead-sealed holes to prevent the upper and lower housings from being accidentally opened. Attached Figure Description

[0014] 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, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present utility model; Figure 2 yes Figure 1 An explosion diagram; Figure 3 yes Figure 1 Internal structural diagram; Figure 4 This is a schematic diagram of the inner side of the upper and lower shells of Embodiment 1 of this utility model; Figure 5 This is a schematic diagram of the lower shell structure of Embodiment 1 of this utility model; Figure 6 This is a schematic diagram of the upper shell structure of Embodiment 1 of this utility model; Figure 7 This is a schematic diagram of the structure of the guide protrusion in Embodiment 1 of this utility model; Figure 8 This is a structural schematic diagram of Embodiment 2 of the present invention; Figure 9 yes Figure 8 An explosion diagram.

[0016] In the diagram: 1-Upper housing; 2-Lower housing; 3-Iron core; 4-Port; 5-Connecting plate; 6-Rotating shaft; 7-Mounting hole; 8-Elastic buckle plate; 9-Card block; 10-Card slot; 11-Positioning plate; 12-Locking block; 13-First lead seal hole; 14-Second lead seal hole; 15-Output terminal; 16-Wire hole; 17-Wire groove; 18-Frame; 19-Spring; 20-Guide protrusion; 21-Hook; 22-Push rod; 23-Insertion rod; 24-Connecting part; 25-Support; 26-Button; 27-Anti-detachment spring; 28-Guide groove; 29-Cable hole. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0018] like Figures 1 to 7 As shown, a type of openable current transformer includes an upper housing 1 and a lower housing 2 located below the upper housing 1. Semi-circular iron cores 3 are installed inside the upper housing 1 and the lower housing 2, respectively. Openings 4 are provided at the bottom left and right ends of the upper housing 1 and the top left and right ends of the lower housing 2, allowing the corresponding ends of the iron cores 3 to protrude. This allows the corresponding ends of the two iron cores 3 to smoothly connect when the upper housing 1 and the lower housing 2 are closed. When the upper housing 1 and the lower housing 2 are closed, a cable hole 29 is formed between them, allowing the cable to be tested to pass through. The cable hole 29 extends through both the upper housing 1 and the lower housing 2. Furthermore, the upper housing 1 and the lower housing 2 are each composed of two opposing half-shells welded together by ultrasonic welding, facilitating the assembly of internal components such as the iron cores 3.

[0019] Two connecting plates 5 are provided at the bottom left end of the upper shell 1, facing each other. The connecting plates 5 are integrally formed on the upper shell 1, such as... Figure 6 As shown, the connecting plate 5 extends downwards, and the inner sides of the two connecting plates 5 are each integrally formed with a coaxially arranged rotating shaft 6, which extends back and forth; as Figure 2 As shown, the left end front and rear side walls of the lower housing 2 are respectively provided with mounting holes 7 that match the corresponding rotating shafts 6, and the rotating shafts 6 are rotatably installed in the mounting holes 7; the right end outer wall of the lower housing 2 is snapped or ultrasonically welded with an upwardly extending elastic buckle plate 8, which can be elastically bent left and right, such as... Figure 2 and Figure 5As shown, a locking block 9 is integrally formed on the outer wall of the right end of the upper housing 1. The inner side of the elastic buckle plate 8 is provided with a slot 10 for the locking block 9 to be inserted. When the upper housing 1 and the lower housing 2 are closed, the locking block 9 is inserted into the slot 10, thereby restricting the upper housing 1 and the lower housing 2 from rotating relative to each other around the axis of the rotating shaft 6.

[0020] When installing the current transformer, the locking block 9 is disengaged from the slot 10 by moving the elastic buckle plate 8 to the right. Then, the upper housing 1 and the lower housing 2 are rotated relative to each other around the axis of the rotating shaft 6, causing the right ends of the upper housing 1 and the lower housing 2 to separate. One side of the cable hole 29 between the upper housing 1 and the lower housing 2 is opened, which facilitates the insertion of the cable to be tested between the upper housing 1 and the lower housing 2. After the cable to be tested is passed through the cable hole 29 between the upper housing 1 and the lower housing 2, the upper housing 1 and the lower housing 2 are closed together again, and the locking block 9 is re-engaged into the slot 10 of the elastic buckle plate 8, thereby restricting the relative rotation and separation of the upper housing 1 and the lower housing 2.

[0021] like Figure 2 and Figure 4 As shown, the lower housing 2 has two upwardly extending positioning plates 11 at the end away from the rotating shaft 6. The positioning plates 11 are integrally formed on the top right end of the lower housing 1. When the upper housing 1 and the lower housing 2 are closed, the right end of the upper housing 1 is inserted between the two positioning plates 11, thereby preventing the upper housing 1 and the lower housing 2 from being misaligned when they are closed.

[0022] like Figure 2 As shown, a locking block 12 is integrally formed on the right outer wall of the upper housing 1. Two locking blocks 12 are arranged opposite each other. The locking block 12 is provided with a first lead-sealing hole 13, which extends parallel to the rotating shaft 6. The upper end of the elastic buckle plate 8 is provided with a second lead-sealing hole 14 that runs through the front and back. When the locking block 9 is inserted into the locking groove 10, the upper end of the elastic buckle plate 8 enters between the two locking blocks 12, and the first lead-sealing hole 13 and the second lead-sealing hole 14 are aligned. By installing steel wire lead seals in the first lead-sealing hole 13 and the second lead-sealing hole 14, unauthorized personnel are prevented from opening the upper housing 1 and the lower housing 2, thus improving security.

[0023] An output terminal 15 is mounted on the top of the upper housing 1; the mounting hole 7 connects to the inner cavity of the lower housing 2, such as... Figure 6 As shown, the rotating shaft 6 is provided with a wire-passing hole 16 at one end, which is connected to the inner cavity of the lower housing 2. The wire-passing hole 16 extends along the axial direction of the rotating shaft 6. The inner sides of the front and rear side walls of the upper housing 1 are respectively provided with recessed wire-passing grooves 17. One end of the wire-passing groove 17 is connected to the inner cavity of the upper housing 1, and the other end penetrates the side wall of the opening 4 at the left end of the upper housing 1 and the outer wall of the rotating shaft 6 and is connected to the corresponding wire-passing hole 16. This facilitates the passage of the secondary winding lead wire on the iron core 3 in the lower housing 2 through the wire-passing hole 16 and the wire-passing groove 17 into the upper housing 1 and connecting it to the output terminal 15.

[0024] The outer side of the iron core 3 is covered by a frame 18, which is a hollow semi-circular arc shape, with the end faces of the iron core 3 exposed at both ends of the frame 18. A shielding component is also provided between the frame 18 and the iron core 3; Figure 3 As shown, springs 19 are connected between the inner side of the top wall of the upper shell 1 and the corresponding frame 18, and between the inner side of the bottom wall of the lower shell 2 and the corresponding frame 18. The top of the inner frame 18 of the upper shell 1 and the bottom of the inner frame 18 of the lower shell 2 are integrally formed with vertically extending spring guide posts. One end of the spring 19 is sleeved on the spring guide post, and the other end abuts against the inner wall of the upper shell 1 or the lower shell 2. When the upper shell 1 and the lower shell 2 are closed, the spring 19 can make the upper and lower iron cores 3 fit tightly together.

[0025] like Figure 7 As shown, the inner wall of the opening 4 is provided with a vertically extending guide groove 28, and the inner peripheral walls at both ends of the corresponding skeleton 18 are integrally formed with guide protrusions 20 that match the guide groove 28. The guide protrusions 20 are vertically slidably installed in the guide groove 28, so that the skeleton 18 and the iron core 3 can only move in the vertical direction, avoiding circumferential deflection of the iron core 3 and preventing misalignment when the upper and lower iron cores 3 are in contact. Example

[0026] like Figure 8 and Figure 9 As shown, the difference between this embodiment and Embodiment 1 is that a hook 21 is movably installed on the upper housing 1. The hook 21 includes a push rod 22 and an insert rod 23 that are parallel to each other, and a connecting part 24 connecting the rear ends of the push rod 22 and the insert rod 23. The push rod 22, the insert rod 23, and the connecting part 24 are integrally bent into shape. A support 25 is integrally formed on the right outer wall of the upper housing 1. The push rod 22 is slidably installed on the support 25 along the axial direction of the first lead-sealed hole 13. When the first lead-sealed hole 13 is aligned with the second lead-sealed hole 14, the push rod 22 is slid forward and drives the insert rod 23 to be inserted forward into the first lead-sealed hole 13 and the second lead-sealed hole 14, thereby preventing the elastic buckle plate 8 from bending and causing the locking block 9 to disengage from the locking groove 10, thus preventing the elastic buckle plate 8 from accidentally loosening and causing the upper housing 1 and the lower housing 2 to open accidentally.

[0027] A button 26 is fixedly installed at the front end of the push rod 22. An anti-disengagement spring 27 is sleeved on the push rod 22 located between the support 25 and the button 26. The anti-disengagement spring 27 provides a forward pushing force to the push rod 22 and the insertion rod 23 to prevent the insertion rod 23 from accidentally falling out of the first lead seal hole 13 and the second lead seal hole 14; or pressing the button 26 will cause the insertion rod 22 to move backward and disengage from the first lead seal hole 13 and the second lead seal hole 14, and then the elastic buckle plate 8 can be moved to the right to open one end of the upper housing 1 and the lower housing 2.

[0028] When the current transformer is used in a closed location or a relatively safe environment, the upper housing 1 and the lower housing 2 can be prevented from being accidentally opened by inserting a plug rod 23 into the first lead seal hole 13 and the second lead seal hole 14 without the need to install a steel wire lead seal, making the disassembly and assembly of the upper housing 1 and the lower housing 2 more convenient.

[0029] 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 preferred examples and are not intended to limit the 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. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A switchable current transformer, characterized in that: The device includes an upper housing and a lower housing located below the upper housing. Semi-circular iron cores are installed inside the upper housing and the lower housing, respectively. The bottom of the upper housing and the top of the lower housing each have openings for the two ends of the corresponding iron cores to protrude. Two connecting plates are positioned opposite each other at one end of the upper housing. The connecting plates extend downwards, and coaxially arranged rotating shafts are located on the inner sides of the two connecting plates. Mounting holes matching the corresponding rotating shafts are located on opposite side walls of the lower housing. An upwardly extending elastic buckle plate is fixedly installed at the end of the lower housing away from the rotating shafts. A locking block is provided on the upper housing, and the elastic buckle plate has a slot for the locking block to engage. When the upper housing and the lower housing are closed, the locking block engages in the slot and restricts relative rotation between the upper and lower housings.

2. The switchable current transformer as described in claim 1, characterized in that: The lower housing has two upwardly extending positioning plates at one end away from the rotating shaft. When the upper housing and the lower housing are closed, the end of the upper housing away from the rotating shaft is inserted between the two positioning plates.

3. The switchable current transformer as described in claim 1, characterized in that: The upper housing is provided with a locking block, the locking block is provided with a first lead-sealing hole, and the elastic buckle is provided with a second lead-sealing hole. When the locking block is inserted into the slot, the first lead-sealing hole and the second lead-sealing hole are aligned.

4. The switchable current transformer as described in claim 1, characterized in that: The top of the upper housing is equipped with an output terminal; the mounting hole connects to the inner cavity of the lower housing; the rotating shaft is provided with a wire-passing hole that connects to the inner cavity of the lower housing; the inner wall of the upper housing is provided with a wire-passing groove that connects the wire-passing hole and the inner cavity of the upper housing.

5. The switchable current transformer as described in claim 1, characterized in that: The outer side of the iron core is covered with a skeleton, and springs are respectively connected between the inner side of the top wall of the upper shell and the corresponding skeleton, and between the inner side of the bottom wall of the lower shell and the corresponding skeleton.

6. The switchable current transformer as described in claim 5, characterized in that: The inner wall of the opening is provided with a vertically extending guide groove, and the corresponding skeleton is provided with a guide protrusion that matches the guide groove.

7. A switchable current transformer as described in claim 3, characterized in that: A hook is movably mounted on the upper housing. The hook includes a push rod and an insert rod that are parallel to each other, and a connecting part connecting one end of the push rod and the insert rod. A support is provided on the upper housing. The push rod is slidably mounted on the support along the axial direction of the first lead-sealed hole. When the first lead-sealed hole is aligned with the second lead-sealed hole, the insert rod is inserted into the first lead-sealed hole and the second lead-sealed hole to restrict the elastic buckle from bending, thereby causing the locking block to disengage from the locking groove.

8. A switchable current transformer as described in claim 7, characterized in that: A button is fixedly installed at the end of the push rod away from the connecting part, and an anti-disengagement spring is sleeved on the push rod located between the support and the button.

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