Annular current transformer coil

Abstract

The utility model discloses an annular current transformer coil, and particularly relates to the field of current transformers, the annular current transformer coil comprises a magnetic core, an epoxy resin insulating layer is arranged on the outer surface of the magnetic core, a winding coil is wound on the outer surface of the epoxy resin insulating layer, an insulating plate is sleeved on the outer surface of the epoxy resin insulating layer, and the insulating plate is arranged on the outer surface of the magnetic core. A supporting plate is arranged at the bottom of the insulating plate, and positioning holes are symmetrically formed in the two ends of one side of the supporting plate. Heat generated by the magnetic core can be conducted out through the heat conduction plate, the heat absorbed by the heat conduction plate can be transferred to the middle of the heat conduction block and the middle of the extrusion plate through the connection of the insulation heat conduction pipe and the heat conduction connecting rod through the connecting groove, and air passes through the heat dissipation holes and the surface of the extrusion plate. And therefore, the heat conduction block and the extrusion plate can be rapidly cooled, the heat conduction plate can be sequentially cooled, the magnetic core is cooled, the heat dissipation efficiency is improved, and high-temperature damage is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of current transformers, and more specifically, to a ring-shaped current transformer coil. Background Art

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

[0003] The utility model with Chinese patent application number CN202223593587.0 discloses a new structure of a protective toroidal current transformer. The utility model has a simple structure, plays a good role in protecting the paint film of the internal winding enameled wire from breaking, and optimizes the flatness of the upper and lower end surfaces of the coil;

[0004] However, in actual use, the existing current transformer is a device that can convert high AC current into easily controllable low current; the current transformer will generate more heat when in use, and the existing current transformer has poor heat dissipation effect, which will cause certain damage to the low-voltage current transformer in the long run, and its practicality is poor. Utility Model Content

[0005] In order to overcome the above defects of the prior art, the utility model provides a toroidal current transformer coil to solve the problems raised in the above background technology.

[0006] To achieve the above object, the utility model provides the following technical solution: a toroidal current transformer coil, comprising a magnetic core, an epoxy resin insulation layer is provided on the outer surface of the magnetic core, a winding coil is wound around the outer surface of the epoxy resin insulation layer, an insulating plate is sleeved on the outer surface of the epoxy resin insulation layer, a support plate is provided at the bottom of the insulating plate, and positioning holes are symmetrically opened at both ends of one side of the support plate;

[0007] It can be seen that the epoxy resin insulation layer can insulate the winding coil and the magnetic core, and can improve the bonding strength between the heat conductive plate and the magnetic core when pouring the epoxy resin insulation layer, and insulate the outer surface through the insulation plate, and support the insulation plate through the support plate and the positioning hole, and align and stack multiple insulation plates together for easy installation and use;

[0008] The inner ring of the magnetic core is fitted with a heat-conducting plate, one side of the heat-conducting plate is fixedly connected with an insulating heat-conducting pipe, one end of the insulating heat-conducting pipe is provided with a connecting groove, and a heat-conducting connecting rod is inserted in the middle of the connecting groove;

[0009] It can be seen that the heat generated by the magnetic core can be conducted out through the heat conduction plate, and the heat of the magnetic core can be conducted to the outside through the connection of the insulating heat conduction pipe and the connection groove, so as to play a heat dissipation role. The heat conduction block can be conveniently connected to the heat conduction plate through the cooperation of the heat conduction connecting rod and the connection groove, which is convenient for installation and use, and does not affect the normal use and configuration of the epoxy resin insulation layer, the winding coil and the insulation plate, thereby improving the use;

[0010] One end of the heat-conducting connecting rod is fixedly connected to a heat-conducting block, an end of the heat-conducting connecting rod close to the heat-conducting block is sleeved with an extrusion plate, and a plurality of heat dissipation holes are opened on the surface of the heat-conducting block;

[0011] It can be seen that the heat from the heat-conducting connecting rod and the insulating heat-conducting pipe can be dissipated through the heat-conducting block, and the heat-conducting block can be quickly cooled through the heat-dissipating holes. The extrusion plate can improve the fitting strength between the heat-conducting block and the insulating heat-conducting pipe, and the extrusion plate can be used to further dissipate heat and cool down the body.

[0012] Preferably, the winding coil is arranged between an insulating plate and an epoxy resin insulating layer, a protective layer is arranged on the outer surface of the insulating plate, and a flame retardant layer is arranged on the outer surface of the epoxy resin insulating layer;

[0013] It can be seen that the insulating effect of the epoxy resin insulating layer and the magnetic core can be improved by setting the insulating board and the epoxy resin insulating layer, and the outer surface of the insulating board can be protected by the set protective layer to prevent the surface of the insulating board from being damaged due to impact and collision, and the flame retardant layer can be set to prevent the insulating effect of the epoxy resin insulating layer from being affected by the gradual increase in temperature of the magnetic core, thereby improving the use effect.

[0014] Preferably, the cross-sectional shape of the heat conducting plate is set to be an arc shape, the heat conducting plate is in contact with the wall of the magnetic core, and the heat conducting plate is arranged inside the epoxy resin insulation layer;

[0015] It can be seen that by setting the heat conducting plate to be an arc-shaped structure, the bonding strength between the heat conducting plate and the magnetic core can be increased, thereby improving the heat transfer effect.

[0016] Preferably, the insulating heat-conducting pipe runs through the middle of the epoxy resin insulation layer, and the insulating heat-conducting pipe and the winding coil are offset from each other;

[0017] It can be seen that the insulating heat-conducting tube can play an insulating role, does not affect the normal winding and use of the winding coil, and improves the use effect.

[0018] Preferably, one end of the heat-conducting connecting rod is threadedly connected to the wall of the connecting groove, the heat-conducting connecting rod penetrates the wall of the insulating plate, and the heat-conducting block is arranged in the middle of the inner circle of the insulating plate;

[0019] It can be seen that the heat-conducting connecting rod and the connecting groove are provided to conveniently connect the heat-conducting block and the insulating heat-conducting pipe, so that the heat of the insulating heat-conducting pipe is transferred to the inside of the heat-conducting block through the heat-conducting connecting rod, thereby playing the role of heat-conducting connection.

[0020] Preferably, the cross-sectional shape of the extruded plate is set to an arc-shaped structure, the extruded plate is arranged in the middle of the inner circle of the insulating plate, and the extruded plate is in contact with the wall of the insulating plate;

[0021] It can be seen that by squeezing the insulating plate with the extrusion plate, the stability of the extruded plate can be improved, thereby improving the stability of the heat-conducting block, and the heat dissipation effect can be further improved by the extrusion plate.

[0022] Preferably, the heat conducting block is configured as a cylindrical structure, and the heat dissipation holes are provided in a plurality of numbers and distributed in a circular array around the heat conducting block;

[0023] It can be seen that the heat inside the heat conductive block can be easily dissipated through the heat conductive block and the heat dissipation holes, so that when the gas passes through the middle of the heat dissipation holes, it can take away the heat of the heat conductive block, play a role in heat dissipation, and improve the use effect.

[0024] Technical effects and advantages of the utility model:

[0025] 1. The utility model firstly conducts heat generated by the magnetic core through the heat conduction plate, and connects the heat conduction pipe and the heat conduction connecting rod through the connecting groove, so that the heat absorbed by the heat conduction plate can be transferred to the middle of the heat conduction block and the extrusion plate, and the gas passes through the heat dissipation holes and the surface of the extrusion plate, so as to quickly cool down the heat conduction block and the extrusion plate, and then cool down the heat conduction plate in turn, so as to cool down the magnetic core, improve the heat dissipation efficiency, and avoid high temperature damage;

[0026] 2. The utility model also increases the bonding strength between the heat conducting plate and the magnetic core by setting the heat conducting plate as an arc structure, improves the heat transfer effect, and protects the outer surface of the insulating plate by the provided protective layer to prevent the surface of the insulating plate from being damaged due to impact and collision. The insulating plate is conveniently supported by the support plate and the positioning hole, and multiple insulating plates are aligned and stacked together for easy installation and use. At the same time, the heat conducting block and the insulating heat conducting pipe can be connected and disassembled, and the heat conducting block can be replaced when the surface of the heat dissipation hole is blocked, thereby improving the use effect;

[0027] In summary, through the mutual influence of the above-mentioned multiple effects, the heat generated by the magnetic core can be easily extracted and dissipated, thereby improving the cooling and heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0029] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model.

[0030] Figure 3 It is a schematic diagram of the connection cross-sectional structure of the heat conducting block and the heat conducting plate of the utility model.

[0031] The accompanying drawings are marked as follows: 1. magnetic core; 2. epoxy resin insulation layer; 3. winding coil; 4. insulation plate; 5. support plate; 6. positioning hole; 7. heat conduction plate; 8. insulating heat conduction pipe; 9. connecting groove; 10. heat conduction connecting rod; 11. extrusion plate; 12. heat conduction block; 13. heat dissipation hole. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] As attached Figure 1-3 The toroidal current transformer coil shown comprises a magnetic core 1, an outer surface of the magnetic core 1 is provided with an epoxy resin insulation layer 2, an outer surface of the epoxy resin insulation layer 2 is wound with a winding coil 3, an outer surface of the epoxy resin insulation layer 2 is sleeved with an insulation plate 4, a support plate 5 is provided at the bottom of the insulation plate 4, and positioning holes 6 are symmetrically opened at both ends of one side of the support plate 5;

[0034] The inner ring of the magnetic core 1 is fitted with a heat-conducting plate 7, one side of the heat-conducting plate 7 is fixedly connected to an insulating heat-conducting tube 8, one end of the insulating heat-conducting tube 8 is provided with a connecting groove 9, a heat-conducting connecting rod 10 is inserted in the middle of the connecting groove 9, one end of the heat-conducting connecting rod 10 is fixedly connected to a heat-conducting block 12, one end of the heat-conducting connecting rod 10 close to the heat-conducting block 12 is sleeved with an extrusion plate 11, and a plurality of heat dissipation holes 13 are provided on the surface of the heat-conducting block 12.

[0035] As attached Figure 1-3As shown, the winding coil 3 is arranged between the insulating plate 4 and the epoxy resin insulating layer 2, the outer surface of the insulating plate 4 is provided with a protective layer, the outer surface of the epoxy resin insulating layer 2 is provided with a flame retardant layer, the cross-sectional shape of the heat conducting plate 7 is set to an arc shape, the heat conducting plate 7 is in contact with the wall of the magnetic core 1, the heat conducting plate 7 is arranged inside the epoxy resin insulating layer 2, the insulating heat conducting pipe 8 passes through the middle of the epoxy resin insulating layer 2, the insulating heat conducting pipe 8 and the winding coil 3 are mutually offset, one end of the heat conducting connecting rod 10 is threadedly connected to the wall of the connecting groove 9, the heat conducting connecting rod 10 passes through the wall of the insulating plate 4, the heat conducting block 12 is arranged in the middle of the inner circle of the insulating plate 4, the cross-sectional shape of the extrusion plate 11 is set to an arc structure, the extrusion plate 11 is arranged in the middle of the inner circle of the insulating plate 4, and the extrusion plate 11 and the insulating plate 4 The wall bodies are fitted together, the heat-conducting block 12 is set to a cylindrical structure, and the number of heat-dissipating holes 13 is several, which are distributed in a circular array around the heat-conducting block 12, so that the epoxy resin insulation layer 2 can be set to insulate the winding coil 3 and the magnetic core 1, and when pouring the epoxy resin insulation layer 2, the bonding strength between the heat-conducting plate 7 and the magnetic core 1 can be improved, and the outer surface of the insulation plate 4 is protected by the set protective layer to prevent the surface of the insulation plate 4 from being damaged due to impact and collision, and the flame-retardant layer is set to prevent the insulation effect of the epoxy resin insulation layer 2 from being affected by the gradual increase in the temperature of the magnetic core 1, thereby improving the use effect, and the support plate 5 and the positioning hole 6 are used to support the insulation plate 4, and multiple insulation plates 4 are aligned and stacked together for easy installation and use;

[0036] At the same time, the heat generated by the magnetic core 1 can be discharged through the heat conducting plate 7, and the heat absorbed by the heat conducting plate 7 can be transferred to the middle of the heat conducting block 12 through the insulating heat conducting pipe 8 and the heat conducting connecting rod 10 connected through the connecting groove 9, and the heat conducting block 12 can be quickly cooled through the heat dissipation hole 13, and the heat conducting connecting rod 10 can be further cooled through the extrusion plate 11, thereby improving the heat dissipation efficiency;

[0037] At the same time, the heat conductive block 12 and the insulating heat conductive pipe 8 can be connected and disassembled, and the heat conductive block 12 can be replaced when the surface of the heat dissipation hole 13 is blocked. When assembling the insulating plate 4 and the winding coil 3, the normal assembly of the insulating plate 4 and the winding coil 3 is not affected, thereby improving the use effect. By setting the heat conductive plate 7 as an arc structure, the bonding strength between the heat conductive plate 7 and the magnetic core 1 can be increased, thereby improving the heat transfer effect.

[0038] Working principle of the utility model: when using, when pouring the epoxy resin insulation layer 2, the heat conducting plate 7 can be firstly attached to the inner cavity of the magnetic core 1, and after the epoxy resin insulation layer 2 is solidified, the heat conducting plate 7 is wrapped between the epoxy resin insulation layer 2 and the magnetic core 1, so that one side wall of the heat conducting plate 7 is close to the wall of the magnetic core 1, and the insulating heat conducting tube 8 passes through the middle of the epoxy resin insulation layer 2, and then the winding coil 3 is wound, the insulating plate 4 is wrapped, and then the heat conducting connecting rod 10 is rotated and inserted into the middle of the insulating heat conducting tube 8 so that the extrusion plate 11 is close to the wall of the insulating plate 4;

[0039] When the temperature inside the magnetic core 1 rises, the heat can be introduced into the surfaces of the heat-conducting block 12 and the extrusion plate 11 through the heat-conducting plate 7 and the insulating heat-conducting pipe 8, and the insulating heat-conducting pipe 8 can play an insulating role. When the gas passes through the middle of the insulating plate 4, it can take away the heat from the surface of the extrusion plate 11 and drive the heat of the heat-conducting block 12 through the heat dissipation holes 13, thereby playing a role in heat dissipation and cooling, thereby improving the use effect.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A toroidal current transformer coil, comprising a magnetic core (1), characterized in that: The outer surface of the magnetic core (1) is provided with an epoxy resin insulation layer (2), the outer surface of the epoxy resin insulation layer (2) is wound with a winding coil (3), the outer surface of the epoxy resin insulation layer (2) is sleeved with an insulation plate (4), the bottom of the insulation plate (4) is provided with a support plate (5), and positioning holes (6) are symmetrically provided at both ends of one side of the support plate (5); The inner ring of the magnetic core (1) is fitted with a heat conducting plate (7) around its periphery, an insulating heat conducting pipe (8) is fixedly connected to one side of the heat conducting plate (7), a connecting groove (9) is provided at one end of the insulating heat conducting pipe (8), and a heat conducting connecting rod (10) is inserted in the middle of the connecting groove (9); One end of the heat-conducting connecting rod (10) is fixedly connected to a heat-conducting block (12); one end of the heat-conducting connecting rod (10) close to the heat-conducting block (12) is sleeved with an extrusion plate (11); and a plurality of heat dissipation holes (13) are provided on the surface of the heat-conducting block (12).

2. The toroidal current transformer coil according to claim 1, characterized in that: The winding coil (3) is arranged between an insulating plate (4) and an epoxy resin insulating layer (2); the outer surface of the insulating plate (4) is provided with a protective layer; and the outer surface of the epoxy resin insulating layer (2) is provided with a flame retardant layer.

3. The toroidal current transformer coil according to claim 1, characterized in that: The cross-sectional shape of the heat conducting plate (7) is set to be an arc shape, the heat conducting plate (7) is in contact with the wall of the magnetic core (1), and the heat conducting plate (7) is arranged inside the epoxy resin insulation layer (2).

4. The toroidal current transformer coil according to claim 1, characterized in that: The insulating heat-conducting pipe (8) penetrates the middle of the epoxy resin insulating layer (2), and the insulating heat-conducting pipe (8) and the winding coil (3) are offset from each other.

5. The toroidal current transformer coil according to claim 1, characterized in that: One end of the heat-conducting connecting rod (10) is threadedly connected to the wall of the connecting groove (9), the heat-conducting connecting rod (10) penetrates the wall of the insulating plate (4), and the heat-conducting block (12) is arranged in the middle of the inner circle of the insulating plate (4).

6. The toroidal current transformer coil according to claim 1, characterized in that: The cross-sectional shape of the extrusion plate (11) is set to an arc-shaped structure. The extrusion plate (11) is arranged in the middle of the inner circle of the insulating plate (4). The extrusion plate (11) is in contact with the wall of the insulating plate (4).

7. The toroidal current transformer coil according to claim 1, characterized in that: The heat conducting block (12) is configured as a cylindrical structure, and the heat dissipation holes (13) are provided in a plurality of numbers and are distributed in a circular array around the heat conducting block (12).

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