transformer

Abstract

The application is suitable for the technical field of power distribution equipment, and particularly provides a transformer, which comprises a magnetic ring, a wire and a framework; the surface of the magnetic ring is coated with an insulating material; the wire is wound on the magnetic ring, and the wire is wrapped with three insulating layers; the framework comprises a stand for bearing the magnetic ring, the stand is provided with a groove for accommodating the magnetic ring, the magnetic ring and the groove are fixed by epoxy resin bonding, the framework further comprises a terminal block arranged at the end of the stand, the terminal block comprises a metal pin for connecting with the wire, and the stand is further provided with an accommodating groove for accommodating the wire when the wire is connected with the metal pin. The technical problems of poor anti-vibration and anti-impact performance, unfirm structure, low working temperature, easy thermal expansion of the wire and poor environmental adaptability of the existing transformer are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power distribution equipment, and more particularly to a transformer. BACKGROUND

[0002] The transformer is a device for changing AC voltage by using the principle of electromagnetic induction, and the main components are primary coil, secondary coil and core (magnetic core). The main functions include: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization (magnetic saturation transformer) and the like.

[0003] The transformer is a basic equipment for power transmission and distribution, and is widely used in industrial, agricultural, transportation and urban community fields. The existing transformer has poor anti-vibration and anti-impact performance, and the structure is not firm. The working temperature is low, the lead is easy to expand due to heat, and the environmental adaptability is poor. SUMMARY

[0004] The purpose of the present application is to provide a transformer, which solves the technical problems of poor anti-vibration and anti-impact performance, poor structure, low working temperature, easy expansion of lead due to heat, and poor environmental adaptability of the existing transformer in the prior art.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is to provide a transformer, comprising:

[0006] A magnetic ring, the surface of the magnetic ring is coated with a layer of insulating material;

[0007] A lead, the lead is wound around the magnetic ring, and the lead is wrapped with three layers of insulating layers; and

[0008] A skeleton, the skeleton comprises a rack for bearing the magnetic ring, the rack is provided with a groove for accommodating the magnetic ring, the magnetic ring and the groove are fixed by epoxy resin bonding, the skeleton further comprises a terminal block provided at the end of the rack, the terminal block comprises a metal pin for connecting with the lead, and the rack is further provided with an accommodation groove for accommodating the lead passing through the metal pin.

[0009] In one embodiment, the magnetic ring is manganese zinc ferrite, the skeleton material is bakelite, and the three layers of insulating layers wrapped around the lead are respectively polyamide resin layer, polyester film layer and polyamide resin layer.

[0010] In one embodiment, the accommodation groove comprises a horizontal groove and a vertical groove, the horizontal groove is on the same surface of the rack as the groove, the vertical groove is located at the side of the rack, the two ends of the horizontal groove are respectively communicated with the groove and the vertical groove, and the cross sections of the horizontal groove and the vertical groove are both semicircular.

[0011] In one of the embodiments, the groove is a circular groove, the diameter of the groove is matched with the outer diameter of the magnetic ring, and a plurality of first arc-shaped recesses for accommodating the wires are arranged on the sidewall of the groove and are uniformly distributed along the circumferential direction of the sidewall.

[0012] In one of the embodiments, a circular protrusion is further arranged in the middle of the groove, the circular protrusion is used for being clamped into the inner ring of the magnetic ring, and a plurality of second arc-shaped recesses for accommodating the wires are further arranged on the edge of the circular protrusion and are uniformly distributed along the circumferential direction of the circular protrusion.

[0013] In one of the embodiments, the metal pins include a first metal pin fixedly arranged and a second metal pin movably arranged, the wires are used for being connected with the first metal pin, and the first metal pin is electrically connected with the second metal pin.

[0014] In one of the embodiments, the terminal block further includes:

[0015] a fixed frame fixedly connected to the end of the frame table, the fixed frame being in a U shape, the first metal pin being arranged on the fixed frame, a strip-shaped metal sheet being arranged on the fixed frame, and the first metal pin being connected with the metal sheet; and

[0016] a moving frame slidably connected with the fixed frame, the second metal pin being arranged on the moving frame, the second metal pin being in contact with the metal sheet and being slid relative to the metal sheet when the moving frame slides relative to the fixed frame.

[0017] In one of the embodiments, a strip-shaped long groove is arranged on the fixed frame, the shape of the metal sheet is matched with the shape of the long groove, the metal sheet is arranged in the long groove, the first metal pin is connected with the metal sheet after penetrating the groove bottom of the long groove, the second metal pin enters the metal sheet from the groove opening of the long groove, and the second metal pin moves along the length direction of the long groove by means of the moving frame.

[0018] In one of the embodiments, the moving frame includes a frame plate and two connecting rods arranged on the frame plate, a slide rail is arranged on the fixed frame, the connecting rods are slidably connected with the slide rail, the length direction of the slide rail is the same as the length direction of the long groove, the second metal pin is provided with external threads, a matched threaded hole is arranged on the frame plate, the second metal pin is inserted into the threaded hole and enters the long groove after penetrating the frame plate.

[0019] In one of the embodiments, a sliding plate is further arranged on the fixing frame, the length direction of the sliding plate is perpendicular to the length direction of the sliding rail, the sliding rail is slidingly connected to the sliding plate, and the connecting rod and the sliding rail and the sliding rail and the sliding plate are relatively fixed by means of the pin shaft.

[0020] The transformer provided by the application has the advantages that compared with the prior art, the magnetic ring is coated with an insulating material, has strong environmental adaptability, the wire is wrapped with three insulating layers, has an H-level temperature resistance, does not expand and does not have geometric deformation when heated, meets the temperature requirement of the transformer, the framework is provided with a groove for accommodating the magnetic ring, and the magnetic ring and the groove are fixed by epoxy resin bonding, the bonding is increased, the reliability is improved, the anti-vibration and anti-impact capability of the inductor are met, and the wire is further arranged in the accommodating groove when connected with the metal pin, the stability of the structure is further increased. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0022] Figure 1 The structural schematic diagram of the transformer provided by the embodiment of the application is shown in the figure.

[0023] Figure 2 The structural schematic diagram of the transformer provided by the embodiment of the application is shown in the figure. Figure 1 The structural schematic diagram of the transformer provided by the embodiment of the application is shown in the figure.

[0024] Figure 3 The structural schematic diagram of the transformer provided by the embodiment of the application is shown in the figure. Figure 2 The local enlarged view of A in the figure.

[0025] In the figure, 1, magnetic ring; 2, wire; 3, framework; 4, stand; 5, terminal block; 6, first metal pin; 7, second metal pin; 8, accommodating groove; 9, groove; 10, first arc-shaped recess; 11, second arc-shaped recess; 12, circular protrusion; 13, fixing frame; 14, moving frame; 15, long slot; 16, frame plate; 17, connecting rod; 18, sliding rail; 19, sliding plate. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects of the application more clearly, the following will further describe the application in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the application, and are not used to limit the application.

[0027] It should be noted that when an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or indirectly connected to the other element.

[0028] In addition, the terms "first", "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited. The meaning of "several" is one or more, unless otherwise explicitly specified and limited.

[0029] In the description of the present application, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0030] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] Please refer to 1、 Figure 2 、 Figure 3 The present application provides a specific embodiment of a transformer, which comprises a magnetic ring 1, a wire 2, and a framework 3.

[0032] The magnetic ring 1 is used to wind the wire 2, and the surface of the magnetic ring 1 is coated with an insulating material to improve the stability and reliability of the magnetic ring 1.

[0033] The wire 2 is wound on the magnetic ring 1, and the wire 2 is wrapped with three layers of insulation layer; the three layers of insulation layer can effectively improve the adaptability of the wire 2, the temperature resistance level is H level, the wire 2 does not expand and does not deform when heated, and the temperature requirement of the transformer is met through multiple tests and verifications, and the working temperature range of the driving transformer (-55℃-105℃) is realized.

[0034] The skeleton 3 includes a stand 4 for bearing the magnetic ring 1, and the stand 4 is provided with a groove 9 for accommodating the magnetic ring 1, and the magnetic ring 1 and the groove 9 are fixed by epoxy resin bonding, and the skeleton 3 further includes a terminal block 5 arranged at the end of the stand 4, and the terminal block 5 includes a metal pin for connecting with the wire 2, and the stand 4 is further provided with an accommodating groove 8 for accommodating the wire 2 when the wire 2 connects the metal pin. In this embodiment, the magnetic ring 1 coil wound with three layers of insulation layer is soaked in varnish and then baked and cured, further improving the anti-vibration and anti-impact capability of the inductor.

[0035] Specifically, when the magnetic ring 1 is wound with the wire 2, it is arranged on the skeleton 3, specifically in the groove 9, and in order to increase the stability, the magnetic ring 1 and the groove 9 are further fixed by epoxy resin bonding, so that the magnetic ring 1 and the skeleton 3 are firmly connected, and the anti-vibration and anti-impact capability is increased. The terminal block 5 further includes a metal pin for connecting with the wire 2, when the wire 2 connects the metal pin from the magnetic ring 1, it passes through the surface of the skeleton 3, and then enters the accommodating groove 8 on the stand 4, so that the wire 2 connects the metal pin according to the preset path, and the stability of the wire 2 is also increased.

[0036] Specifically, the wire 2 can generally include a primary coil and a secondary coil, and the secondary coil can be multiple, and the primary coil and the secondary coil can be wound on the magnetic ring 1, the two ends of the primary coil are respectively connected with a metal pin, and the two metal pins are connected with a primary voltage, the two ends of the secondary coil are respectively connected with a metal pin, and the two metal pins are respectively used for outputting an adjusted voltage.

[0037] As Figure 1 , this embodiment is provided with one primary coil and two secondary coils, and adopts a three-wire sandwich winding method, which makes the leakage inductance less than 0.1μH, meeting the product electrical performance (leakage inductance ≤0.3μH) requirement. It should be noted that the winding method in the figure cannot adjust the rise and fall of the voltage, because the primary coil and the secondary coil have the same number of turns, and it is only an isolation type transformer, of course, the number of primary coils and secondary coils and the number of turns can be changed according to actual needs.

[0038] The beneficial effects of the embodiment are that, compared with the prior art, the magnetic ring 1 in the application is coated with an insulating material on the surface, has strong environmental adaptability, the wire 2 is wrapped with three layers of insulating layers, has an H-level temperature resistance, the wire 2 does not expand and does not have geometric deformation when heated, meets the temperature requirements of the transformer, the framework 3 is provided with a groove 9 for accommodating the magnetic ring 1, and the magnetic ring 1 and the groove 9 are fixed by epoxy resin bonding, which increases the bonding and improves the reliability, thereby meeting the anti-vibration and anti-impact capacity of the inductor, and at the same time, the wire 2 is also arranged in the accommodating groove 8 when connected with the metal pin, which further increases the stability of the structure.

[0039] As a preferred embodiment of the transformer provided by the embodiment, the magnetic ring 1 is manganese-zinc ferrite, the framework 3 is made of bakelite, and the three layers of insulating layers wrapped by the wire 2 are respectively polyamide resin layers, polyester film layers in the middle layer and the inner layer.

[0040] The magnetic core is made of manganese-zinc ferrite material, has high Curie temperature, and is coated with an insulating material on the surface, has strong environmental adaptability; the framework 3 is made of high-temperature-resistant bakelite, has a melting temperature as high as 410℃, and can adapt to long-term work in an environment of 180℃; the three layers of insulating wires have an H-level, have high safety voltage resistance, have a temperature resistance of 180℃, and have a minimum breakdown voltage of more than 5000V. Therefore, the materials selected in the application can meet the environmental requirements such as moisture resistance and mildew resistance, realize that the driving transformer materials meet the electrical characteristics such as dielectric voltage resistance and insulation resistance, and significantly improve the electrical characteristics of the transformer.

[0041] As Figure 1 and Figure 2 In one embodiment, the accommodating groove 8 includes horizontal grooves and vertical grooves. Since the wire 2 passes through the surface of the frame 4, the horizontal grooves are arranged on the surface, and since the wire 2 can pass through the side surface of the frame 4, the vertical grooves are arranged on the side surface. The horizontal grooves and the groove 9 are arranged on the same surface of the frame 4, the horizontal grooves are respectively connected with the vertical grooves and the groove 9, so that the wire 2 wound from the magnetic ring 1 can be placed into the horizontal grooves, can be extended into the vertical grooves, and can then approach and connect the metal pin. Since the wire 2 is arranged in the accommodating groove 8, it is not disordered, and the stability of the wire 2 is good. In order to adapt to the shape of the wire 2, the horizontal grooves and the vertical grooves are both arranged in a semicircular shape, which can adaptively accommodate the wire 2.

[0042] As Figure 2 , further, the groove 9 is a circular groove, the diameter of the groove 9 is matched with the outer diameter of the magnetic ring 1, so that the magnetic ring 1 can be exactly clamped into the groove 9, which increases the firmness of the connection, and a plurality of first arc-shaped recesses 10 for accommodating the wire 2 are arranged on the side wall of the groove 9, and the first arc-shaped recesses 10 are uniformly distributed along the circumferential direction of the side wall of the groove 9.

[0043] Specifically, since the diameter of the groove 9 is matched with the outer diameter of the magnetic ring 1, the magnetic ring 1 is just put into the groove 9, and since the magnetic ring 1 is wound with the wire 2, a first arc-shaped recess 10 capable of accommodating the wire 2 is correspondingly arranged, the first arc-shaped recess 10 is arranged uniformly along the circumferential direction of the side wall of the groove 9, and the number or density of the first arc-shaped recess 10 can be set according to the winding density of the wire 2.

[0044] The embodiment not only enables the magnetic ring 1 to be firmly arranged in the groove 9, but also has the first arc-shaped recess 10 capable of accommodating the wire 2, so that the wire 2 can be prevented from being squeezed.

[0045] Figure 2 Only part of the first arc-shaped recess 10 is shown, and specifically, the first arc-shaped recess 10 can be arranged in a circle along the inner wall of the groove 9.

[0046] As shown in Figure 2 , further, a circular protrusion 12 is arranged in the middle of the groove 9, the circular protrusion 12 is used for clamping into the inner ring of the magnetic ring 1, so that the magnetic ring 1 is more stable when being put into the groove 9, so that the magnetic ring 1 and the stand 4 are firmly connected, and a plurality of second arc-shaped recesses 11 for accommodating the wire 2 are arranged at the edge of the circular protrusion 12, so that the wire 2 in the inner ring of the magnetic ring 1 can also enter the second arc-shaped recess 11, so that the wire 2 in the inner ring is prevented from being squeezed, the circular protrusion 12 is matched with the diameter of the inner ring of the magnetic ring 1, so that the structure is more firm. Figure 2 Only part of the second arc-shaped recess 11 is shown.

[0047] Similarly, the second arc-shaped recess 11 is uniformly distributed along the circumferential direction of the circular protrusion 12. Specifically, the number and density of arrangement can also be set as needed.

[0048] As shown in Figures 1-3 , as a preferred embodiment of the transformer provided in the embodiment, the metal pin is composed of two parts, namely a first metal pin 6 and a second metal pin 7, the first metal pin 6 is fixedly arranged, and the second metal pin 7 is movably arranged, that is, it can move in a certain direction. The first metal pin 6 and the second metal pin 7 are electrically connected.

[0049] Specifically, the wire 2 in the embodiment is directly connected to the first metal pin 6, and the second metal pin 7 is connected to other conductors or power sources for voltage output or input. For example, the second metal pin 7 can be connected to an input power source to input voltage, and the first metal pin 6 corresponding to the second metal pin 7 is connected to a primary coil. Or the second metal pin 7 can be connected to other conductors, and the first metal pin 6 corresponding to the second metal pin 7 is connected to a secondary coil.

[0050] In order to facilitate the connection with the power supply or other conductors, the second metal pin 7 is arranged to be movable in this embodiment, so that the position can be conveniently adjusted, and the power supply or other conductors can be well connected. Specifically, the transformer is arranged on the PCB, and the second metal pin 7 can be welded or plugged on the contact of the PCB, and the movable second metal pin 7 facilitates the connection. Specifically, two first metal pins 6 are respectively connected to the two ends of the wire 2, and the corresponding two second metal pins 7 are respectively connected to the positive and negative poles of the power supply or other two output contacts, for voltage input or output.

[0051] Figure 1 And Figure 2 The transformer shown in FIGS. 1-3 is placed upside down for convenience, and needs to be turned over and used normally. That is, when used, the magnetic ring 1 is arranged in the groove 9 at the bottom surface of the frame 4, the second metal pin 7 is plugged on the PCB, and the wire 2 is connected to the first metal pin 6 exposed above after winding out of the magnetic ring 1.

[0052] As Figure 2 And Figure 3 In order to realize the relative movement of the first metal pin 6 and the second metal pin 7 while maintaining electrical connection, the wiring frame 5 further includes a fixed frame 13 and a moving frame 14 in this embodiment.

[0053] The fixed frame 13 is fixedly connected to the end of the frame 4, and the fixed frame 13 is in the shape of U. The first metal pin 6 is arranged on the fixed frame 13, and a strip-shaped metal sheet is arranged on the fixed frame 13. The first metal pin 6 is connected to the metal sheet.

[0054] Specifically, the metal sheet is fixedly arranged, and the first metal pin 6 is fixedly connected to the metal sheet, so as to realize the conduction between the first metal pin 6 and the metal sheet.

[0055] The moving frame 14 is slidably connected to the fixed frame 13, and the second metal pin 7 is arranged on the moving frame 14. When the moving frame 14 slides relative to the fixed frame 13, the second metal pin 7 contacts the metal sheet and slides relative to the metal sheet.

[0056] While the first metal pin 6 is in conduction with the metal sheet, the second metal pin 7 also contacts the metal sheet, and maintains the contact during sliding. In this way, the second metal pin 7 is in conduction with the first metal pin 6, i.e., electrical connection, while moving.

[0057] As Figure 2 And Figure 3Further, in order to improve the stability of the metal sheet, the embodiment further provides a strip-shaped long slot 15 on the fixing frame 13, the shape of the metal sheet is matched with the shape of the long slot 15, and the metal sheet is arranged in the long slot 15, so that the metal sheet is stably arranged. At this time, the second metal pin 7 is inserted into the long slot 15 to contact the metal sheet, which is more stable. The second metal pin 7 is moved by means of the moving frame 14, and the second metal pin 7 moves to contact the surface of the metal sheet while moving, thereby maintaining the conduction state. The first metal pin 6 is arranged on the fixing frame 13, and specifically can be inserted into the inside of the fixing frame 13 and directly reach the bottom of the long slot 15 to abut against the metal strip. The metal strip is fixed on the bottom of the long slot 15, and can be in the form that a screw is screwed through the metal strip.

[0058] As Figure 3 Further, the relative movement between the moving frame 14 and the fixing frame 13 can be that the moving frame 14 includes a frame plate 16 and two connecting rods 17 arranged on the same side of the frame plate 16, a sliding rail 18 is arranged on the fixing frame 13, the connecting rod 17 is in sliding connection with the sliding rail 18, the length direction of the sliding rail 18 is the same as the length direction of the long slot 15, the second metal pin 7 is provided with external threads, the frame plate 16 is provided with a matching threaded hole, the second metal pin 7 is inserted into the threaded hole and enters the long slot 15 after passing through the frame plate 16.

[0059] Specifically, the connecting rod 17 and the sliding rail 18 can be connected in that a slot or a hole is formed on the connecting rod 17, and the sliding rail 18 slides through the slot or the hole to realize relative sliding, so that the connecting rod 17 moves on the sliding rail 18. The second metal pin 7 is inserted into the threaded hole, and the two are in threaded connection. By screwing the second metal pin 7, the length of the exposed end of the second metal pin 7 can be adjusted, that is, the length of the second metal pin 7 extending into the long slot 15 can be adjusted, so that the contact force of the second metal pin 7 with the metal sheet can be adjusted.

[0060] As Figure 3 Further, the embodiment further provides an implementation that the moving frame 14 can be adjusted in the height direction perpendicular to the length direction of the long slot 15 in addition to moving in the length direction of the long slot 15. A sliding plate 19 is further arranged on the fixing frame 13, the length direction of the sliding plate 19 is perpendicular to the length direction of the sliding rail 18, and the sliding rail 18 is in sliding connection with the sliding plate 19.

[0061] Specifically, a slot or a hole can also be arranged on the sliding rail 18, and the sliding plate 19 passes through the slot or the hole, so that the sliding rail 18 can slide along the length direction of the sliding plate 19 to realize adjustment of the height direction of the moving frame 14.

[0062] The connecting rod 17 and the slide rail 18, and the slide rail 18 and the slide plate 19 can be relatively fixed by means of a pin shaft, and the connecting rod 17 and the slide rail 18, and the slide rail 18 and the slide plate 19 are relatively fixed by means of a pin shaft inserted into both.

[0063] Specifically, holes can be formed on the connecting rod 17 and the slide rail 18, and holes can be formed on the slide rail 18 and the slide plate 19. When the relative movement is adjusted and the positions are adjusted, two holes are opposite to each other, a pin shaft is inserted, and the two are relatively fixed. The relative fixed form is the prior art, which will not be described here.

[0064] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. Transformer, characterized in that The magnet ring is coated with an insulating material on the surface. The wire is wound on the magnet ring, and the wire is wrapped with three layers of insulating layers. And the skeleton includes a rack for bearing the magnet ring, the rack is provided with a groove for accommodating the magnet ring, the magnet ring is fixedly connected with the groove by epoxy resin, the skeleton further includes a terminal block arranged at the end of the rack, the terminal block includes a metal pin for connecting with the wire, the rack is further provided with an accommodating groove for accommodating the wire when the wire is connected with the metal pin, the metal pin includes a first metal pin fixedly arranged and a second metal pin movably arranged, the wire is connected with the first metal pin, and the first metal pin is electrically connected with the second metal pin; the terminal block further includes a fixed frame and a moving frame, the fixed frame is fixedly connected at the end of the rack, the fixed frame is in U shape, the first metal pin is arranged on the fixed frame, a strip-shaped metal sheet is arranged on the fixed frame, and the first metal pin is connected with the metal sheet; the moving frame is slidably connected with the fixed frame, the second metal pin is arranged on the moving frame, and when the moving frame slides relative to the fixed frame, the second metal pin contacts and slides relative to the metal sheet; the groove is a circular groove, the diameter of the groove is matched with the outer diameter of the magnet ring, a plurality of first arc-shaped recesses for accommodating the wire are arranged on the side wall of the groove, and the first arc-shaped recesses are uniformly distributed along the circumferential direction of the side wall of the groove; a strip-shaped long groove is arranged on the fixed frame, the shape of the metal sheet is matched with the shape of the long groove, the metal sheet is arranged in the long groove, the first metal pin is connected with the metal sheet after penetrating through the groove bottom of the long groove, the second metal pin enters the metal sheet from the groove opening of the long groove and contacts the metal sheet, and the second metal pin moves along the length direction of the long groove by means of the moving frame; the moving frame includes a frame plate and two connecting rods arranged on the frame plate, and a sliding rail is arranged on the fixed frame, and the connecting rods are slidably connected with the sliding rail. The magnet ring is a manganese-zinc ferrite, the skeleton is made of bakelite, and the three layers of insulating layers wrapped around the wire are respectively a polyamide resin layer, a polyester film layer and a polyamide resin layer. The accommodating groove includes a horizontal groove and a vertical groove, the horizontal groove is on the same surface of the rack as the groove, the vertical groove is located at the side of the rack, the two ends of the horizontal groove are respectively communicated with the groove and the vertical groove, and the cross sections of the horizontal groove and the vertical groove are both semicircular.

2. The transformer of claim 1, wherein A circular protrusion is further arranged in the middle of the groove, the circular protrusion is used for clamping into the inner ring of the magnet ring, a plurality of second arc-shaped recesses for accommodating the wire are further arranged at the edge of the circular protrusion, and the second arc-shaped recesses are uniformly distributed along the circumferential direction of the circular protrusion.

3. The transformer of claim 1, wherein, ​ 4. The transformer of claim 3, wherein, ​ 5. The transformer of claim 1, wherein, The length direction of the slide rail is same with the length direction of the long slot, the second metal pin is provided with external thread, the shelf plate is provided with matched thread hole, the second metal pin is inserted into the thread hole and enters into the long slot after passing through the shelf plate.

6. The transformer of claim 5, wherein, The fixed frame is further provided with slide plate, the length direction of the slide plate is perpendicular to the length direction of the slide rail, the slide rail is slidingly connected on the slide plate, the connecting rod and the slide rail and the slide rail and the slide plate can be relatively fixed by means of pin shaft.

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