Small-size large-current transformer

Abstract

The utility model provides a small-size heavy current transformer, which comprises a framework, a primary wire rod, a secondary coil, a magnetic core shaped like a Chinese character'ri ', a shielding copper foil adhesive tape and a temperature sensor, a first partition plate, a winding ring groove, a second partition plate, a containing groove and a third partition plate are sequentially arranged on the peripheral wall of the framework, and the secondary coil is wound in the winding ring groove. A shielding copper foil adhesive tape is wound on the periphery of the secondary coil, the primary wire is a U-shaped wire formed by a flat wire, the magnetic core shaped like the Chinese character'ri 'comprises a magnetic column, a first magnetic plate, a second magnetic plate and two magnetic arms, a groove is formed in the position, located between the two cantilevers of the U-shaped wire, of the installation end face of the framework, and the temperature sensor is located in the groove and used for detecting the temperature of the framework. The small-size large-current transformer is good in anti-interference performance, good in heat dissipation effect, high in working precision, safe, reliable and stable, capable of monitoring the working temperature in real time, capable of achieving automatic and efficient winding and assembling at the same time, high in production efficiency and good in product consistency.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic components, in particular to a small-volume large-current mutual inductor. Background Art

[0002] The current transformer converts the large current on the primary side into a small current on the secondary side based on the principle of electromagnetic induction, and supplies it to instruments and equipment for current measurement, electrical protection and other purposes.

[0003] In order to improve the heat dissipation effect, the existing current transformer exposes part of the winding area on the frame, but the exposed area of ​​the winding is easily disturbed, thereby affecting the working accuracy and reliability of the current transformer. In addition, the exposed area of ​​the winding is prone to leakage, affecting the safety of the current transformer.

[0004] In addition, during the operation of the current transformer, a large current will flow through the windings arranged inside the frame, causing the windings to heat up. When the winding temperature exceeds its maximum allowable temperature, problems such as winding aging, increased resistance, and increased losses will occur. However, current transformers are usually installed in distribution cabinets. When the temperature exceeds the allowable temperature, it is difficult for people to detect. The current transformer cannot be replaced in time to ensure the circuit working accuracy and safety, resulting in safety hazards in the circuit. Summary of the invention

[0005] In order to achieve the main purpose of the utility model, the utility model provides a small-volume large current transformer with good anti-interference performance, good heat dissipation effect, high working precision, safety, reliability and stability, and real-time monitoring of working temperature, while realizing automated and efficient winding and assembly, high production efficiency, and good product consistency.

[0006] In order to achieve the main purpose of the utility model, the utility model provides a small-volume large current transformer, including a skeleton, a primary wire, a secondary coil, a Japanese-type magnetic core, a shielded copper foil tape and a temperature sensor. The skeleton is penetrated with an axial through hole, and the outer peripheral wall of the skeleton is sequentially provided with a first partition, a winding ring groove, a second partition, a receiving groove and a third partition in the axial direction of the axial through hole. The mounting end surface of the first partition protruding from the skeleton is provided with a plurality of pins, the secondary coil is wound in the winding ring groove, and the lead wire of the secondary coil is wound on the pins, at least one layer of shielded copper foil tape is wound around the outer periphery of the secondary coil, and the primary wire is a U-shaped wire composed of flat wires. The material, the connecting arm of the U-shaped wire is located in the accommodating groove, and the two cantilevers of the U-shaped wire are symmetrically arranged about the axial through hole and inserted through the mounting end surface of the protruding skeleton. The Japanese-type magnetic core includes a magnetic column, a first magnetic plate, a second magnetic plate and two magnetic arms. The magnetic column is located in the axial through hole. The first magnetic plate is located on the side of the first partition away from the winding ring groove in the axial direction of the axial through hole. The second magnetic plate is located on the side of the third partition away from the accommodating groove in the axial direction of the axial through hole. The two magnetic arms are respectively located on opposite sides of the skeleton in the axial direction perpendicular to the axial through hole. The mounting end surface of the skeleton is located between the two cantilevers and has a groove. The temperature sensor is located in the groove and is used to detect the temperature of the skeleton.

[0007] It can be seen from the above scheme that the primary wire and the secondary coil of the current transformer of the utility model are partially exposed and arranged on the skeleton, which is helpful to dissipate the heat of the primary wire and the secondary coil, thereby improving the heat dissipation effect and making the heat dissipation effect better. At the same time, the outer periphery of the secondary coil of the current transformer of the utility model is wrapped with at least one layer of shielding copper foil tape, so as to prevent the exposed area of ​​the secondary coil from being disturbed, so that the anti-interference performance is better, thereby improving the working accuracy, and the first partition isolates the secondary coil from the first magnetic plate, the second partition isolates the primary wire and the secondary coil, and the third partition isolates the primary wire from the second magnetic plate, thereby improving the isolation effect between the primary wire, the secondary coil and the Japanese-type magnetic core, thereby improving the working accuracy, stability and reliability of the current transformer. Moreover, the primary wire of the current transformer of the utility model is a U-shaped wire composed of flat wires, and the flat wires have a large unit current density, which is 1.5-2.0 times that of round copper wires, so that the current can be increased, and the skeleton, primary wire, secondary coil and Japanese-type magnetic core of the current transformer of the utility model are compactly matched, thereby reducing the overall volume of the current transformer. In addition, the current transformer of the utility model is provided with a temperature sensor between the two cantilevers of the U-shaped wire, and the temperature sensor is used to detect the temperature of this area of ​​the skeleton. Since the two cantilevers of the U-shaped wire are used to be connected in series in the circuit to access a large current, the heating temperature of the two cantilevers of the U-shaped wire is relatively high, which is also the hottest heating area of ​​the current transformer as a whole. When the maximum allowable temperature is exceeded, the two cantilevers of the U-shaped wire can carry a large current. Therefore, the setting of the temperature sensor can monitor the working temperature of the hottest heating area of ​​the current transformer in real time to ensure the safety, reliability and stability of the use of the current transformer. In addition, the current transformer of the utility model can realize automated and efficient winding and assembly, so that the production efficiency is high and the product consistency is good.

[0008] A further solution is that at least one layer of first insulating tape is wound between the first magnetic plate, the two magnetic arms and the outer side surface of the second magnetic plate.

[0009] A further solution is that at least one layer of second insulating tape is wound across and between the shielding copper foil tape and the outer side surfaces of the two magnetic arms.

[0010] A further solution is to open a limiting groove on the bottom surface of the accommodating groove, and inserting grooves are respectively opened through the frame at both ends of the bottom surface of the limiting groove symmetrically about the axial through hole, the connecting arm is located in the accommodating groove, and a cantilever is inserted into one inserting groove.

[0011] A further solution is that the connecting arm is fixed in the receiving groove by epoxy resin glue.

[0012] A further solution is that a first positioning groove is formed on a first side surface of the skeleton in the axial direction of the shaft through hole, and one side of the first magnetic plate is embedded in the first positioning groove.

[0013] A further solution is that a second positioning groove is formed on a second side surface of the frame in the axial direction of the shaft through hole, and one side of the second magnetic plate is embedded in the second positioning groove.

[0014] A further solution is that a plurality of wire grooves are provided on one side of the mounting end surface of the first partition adjacent to the frame, the wire grooves penetrate the first partition in the axial direction of the shaft through hole, and at least one wire groove is provided between two adjacent pins.

[0015] A further solution is that a first positioning plate is provided on the mounting end surface of the first partition protruding from the frame; and / or a second positioning plate is provided on the mounting end surface of the second partition protruding from the frame; and / or a third positioning plate is provided on the mounting end surface of the third partition protruding from the frame.

[0016] A further solution is that the Japanese-type magnetic core is formed by stacking multiple Japanese-type silicon steel sheets side by side in the extension direction of the cantilever, each Japanese-type silicon steel sheet is composed of an E-type support sheet and an I-type support sheet, and the E-type support sheets and the I-type support sheets are arranged alternately in the extension direction of the cantilever. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram from the first perspective of an embodiment of the small-volume, large-current transformer of the utility model.

[0018] Figure 2 This is a second viewing angle structural diagram of an embodiment of the small volume and large current transformer of the utility model.

[0019] Figure 3 This is a cross-sectional view from a first viewing angle of an embodiment of the small-volume large-current transformer of the utility model.

[0020] Figure 4 It is a cross-sectional view from a second viewing angle of an embodiment of the small-volume large-current transformer of the utility model.

[0021] Figure 5 It is a cross-sectional view from a third viewing angle of an embodiment of the small-volume large-current transformer of the utility model.

[0022] Figure 6 It is a sectional view from a fourth viewing angle of an embodiment of the small-volume large-current transformer of the utility model.

[0023] Figure 7 It is an exploded view of an embodiment of the small-volume large-current transformer of the utility model.

[0024] Figure 8 This is a first-view structural diagram of the skeleton in the embodiment of the small-volume large-current transformer of the utility model.

[0025] Fig. 9 This is a second perspective structural diagram of the skeleton in the embodiment of the small-volume large-current transformer of the utility model.

[0026] Fig.10 It is a cross-sectional view of the skeleton in the embodiment of the small-volume large-current transformer of the utility model.

[0027] Fig.11 It is an exploded view of a Japanese-type magnetic core in an embodiment of a small-volume, large-current transformer of the utility model.

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0029] See also Figures 1 to 11 The present embodiment discloses a small-volume large-current transformer 10, comprising a skeleton 11, a primary wire 15, a secondary coil 17, a Japanese-type magnetic core 18, a shielding copper foil tape 12 and a temperature sensor 16. In the present embodiment, the skeleton 11 is penetrated with an axial through hole 116, and the outer peripheral wall of the skeleton 11 is sequentially provided with a first partition 111, a winding ring groove 112, a second partition 113, a receiving groove 114 and a third partition 115 in the axial direction of the axial through hole 116. The mounting end surface of the first partition 111 protruding from the skeleton 11 is provided with a plurality of pins 119, the secondary coil 17 is wound in the winding ring groove 112, and the lead wire of the secondary coil 17 is wound on the pin 119, and at least one layer of shielding copper foil tape 12 is wound around the outer periphery of the secondary coil 17. Among them, the primary wire 15 of this embodiment is a U-shaped wire composed of flat wires, the connecting arm 151 of the U-shaped wire is located in the receiving groove 114, and the two cantilevers 152 of the U-shaped wire are symmetrically arranged about the shaft through hole 116 and inserted through the mounting end surface of the protruding skeleton 11. At the same time, the Japanese-type magnetic core 18 of this embodiment includes a magnetic column 183, a first magnetic plate 181, a second magnetic plate 182 and two magnetic arms 184, the magnetic column 183 is located in the shaft through hole 116, the first magnetic plate 181 is located on the side of the first partition 111 away from the winding ring groove 112 in the axial direction of the shaft through hole 116, the second magnetic plate 182 is located on the side of the third partition 115 away from the receiving groove 114 in the axial direction of the shaft through hole 116, and the two magnetic arms 184 are respectively located on the opposite sides of the skeleton 11 in the axial direction perpendicular to the shaft through hole 116. In addition, in this embodiment, a groove 1110 is provided on the mounting end surface of the skeleton 11 between the two cantilevers 152 , and the temperature sensor 16 is located in the groove 1110 and is used to detect the temperature of the skeleton 11 .

[0030] The primary wire 15 and the secondary coil 17 of the current transformer 10 of this embodiment are partially exposed and arranged on the skeleton 11, which is helpful to dissipate the heat of the primary wire 15 and the secondary coil 17, thereby improving the heat dissipation effect and making the heat dissipation effect better. At the same time, at least one layer of shielding copper foil tape 12 is wrapped around the periphery of the secondary coil 17 of the current transformer 10 of this embodiment, so as to prevent the exposed area of ​​the secondary coil 17 from being disturbed, so that the anti-interference performance is better, thereby improving the working accuracy, and the first partition 111 isolates the secondary coil 17 and the first magnetic plate 181, the second partition 113 isolates the primary wire 15 and the secondary coil 17, and the third partition 115 isolates the primary wire 15 and the second magnetic plate 182, thereby improving the isolation effect between the primary wire 15, the secondary coil 17 and the Japanese-type magnetic core 18, thereby improving the working accuracy, stability and reliability of the current transformer 10. Furthermore, the primary wire 15 of the current transformer 10 of the present embodiment is a U-shaped wire composed of flat wires, which has a large unit current density, which is 1.5-2.0 times that of round copper wires, thereby increasing the current. In addition, the skeleton 11, the primary wire 15, the secondary coil 17 and the Japanese-type magnetic core 18 of the current transformer 10 of the present embodiment are compactly matched, thereby reducing the overall volume of the current transformer 10. In addition, the current transformer 10 of this embodiment is provided with a temperature sensor 16 between the two cantilevers 152 of the U-shaped wire, and the temperature sensor 16 is used to detect the temperature of this area of ​​the skeleton 11. Since the two cantilevers 152 of the U-shaped wire are used to be connected in series in the circuit to access a large current, the heating temperature of the two cantilevers 152 of the U-shaped wire is relatively high, and it is also the hottest heating area of ​​the current transformer 10 as a whole. When the maximum allowable temperature is exceeded, the two cantilevers 152 of the U-shaped wire are capable of carrying a large current. Therefore, the setting of the temperature sensor 16 can monitor the operating temperature of the hottest heating area of ​​the current transformer 10 in real time to ensure the safety, reliability and stability of the current transformer 10. In addition, the current transformer 10 of this embodiment can realize automated and efficient winding and assembly, so that the production efficiency is high and the product consistency is good.

[0031] In order to further improve the insulation anti-interference performance and the stability of assembly, at least one layer of first insulating tape 13 is wound between the outer side of the first magnetic plate 181, the two magnetic arms 184 and the second magnetic plate 182 in this embodiment. Furthermore, at least one layer of second insulating tape 14 is wound across the shielding copper foil tape 12 and the outer side of the two magnetic arms 184 in this embodiment, thereby further improving the anti-interference performance of the exposed area of ​​the secondary coil 17.

[0032] In order to stably restrict the U-shaped wire on the frame 11, the bottom surface of the receiving groove 114 of this embodiment is provided with a limiting groove 1141, and the two ends of the bottom surface of the limiting groove 1141 symmetrically about the axial through hole 116 respectively penetrate the frame 11 to provide insertion grooves 1142, the connecting arm 151 is located in the receiving groove 114, and one cantilever 152 is inserted into one insertion groove 1142. Furthermore, the connecting arm 151 of the U-shaped wire of this embodiment is fixed in the receiving groove 114 by epoxy resin glue, thereby further improving the stability of the U-shaped wire installed on the frame 11.

[0033] In order to ensure the stability and reliability of the Japanese-type magnetic core 18 assembled on the skeleton 11, the skeleton 11 of this embodiment has a first positioning groove 117 on the first side surface in the axial direction of the shaft through hole 116, and one side of the first magnetic plate 181 is embedded in the first positioning groove 117, and the skeleton 11 of this embodiment has a second positioning groove 118 on the second side surface in the axial direction of the shaft through hole 116, and one side of the second magnetic plate 182 is embedded in the second positioning groove 118.

[0034] Among them, in this embodiment, a plurality of wire grooves 1111 are provided on one side of the mounting end surface of the first partition 111 adjacent to the frame 11, and the wire grooves 1111 are provided through the first partition 111 in the axial direction of the shaft through hole 116, and at least one wire groove 1111 is provided between two adjacent pins 119. The provision of the wire grooves 1111, on the one hand, limits and positions the lead wires of the secondary coil 17, and on the other hand, can play an isolating role, thereby preventing the lead wires of the secondary coil 17 from contacting each other and short-circuiting, and the automatic winding machine can safely and conveniently hang the wires.

[0035] In addition, in the present embodiment, the mounting end surface of the first partition 111 protruding from the skeleton 11 is provided with a first positioning plate 1112, the mounting end surface of the second partition 113 protruding from the skeleton 11 is provided with a second positioning plate 1131, and the mounting end surface of the third partition 115 protruding from the skeleton 11 is provided with a third positioning plate 1151. The first positioning plate 1112, the second positioning plate 1131 and the third positioning plate 1151 can position and support the current transformer 10 as a whole on the circuit board, so that the current transformer 10 can be supported and fixed when it is inserted into the circuit board.

[0036] In addition, the Japanese-type magnetic core 18 of this embodiment is formed by stacking multiple Japanese-type silicon steel sheets side by side in the extension direction of the cantilever 152, each Japanese-type silicon steel sheet is composed of an E-type support sheet 185 and an I-type support sheet 186, and the E-type support sheet 185 and the I-type support sheet 186 are arranged alternately in the extension direction of the cantilever 152.

[0037] The above embodiments are only preferred examples of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles of the present invention should be included in the scope of the present invention patent application.

Claims

1. A small-volume large current transformer, comprising a skeleton, a primary wire, a secondary coil and a Japanese-type magnetic core, characterized in that: Also included are shielded copper foil tape and temperature sensors; The skeleton is penetrated by an axial through hole, and the outer peripheral wall of the skeleton is sequentially provided with a first partition, a winding ring groove, a second partition, a receiving groove and a third partition in the axial direction of the axial through hole, the first partition protruding from the mounting end surface of the skeleton is provided with a plurality of pins, the secondary coil is wound in the winding ring groove, and the lead wire of the secondary coil is wound on the pins, and at least one layer of the shielding copper foil tape is wound around the outer periphery of the secondary coil; The primary wire is a U-shaped wire composed of flat wires, the connecting arm of the U-shaped wire is located in the accommodating groove, and the two cantilevers of the U-shaped wire are symmetrically arranged about the shaft through hole and inserted through the mounting end surface protruding from the frame; The Japanese-type magnetic core comprises a magnetic column, a first magnetic plate, a second magnetic plate and two magnetic arms, wherein the magnetic column is located in the shaft through hole, the first magnetic plate is located on the side of the first partition away from the winding ring groove in the axial direction of the shaft through hole, the second magnetic plate is located on the side of the third partition away from the accommodating groove in the axial direction of the shaft through hole, and the two magnetic arms are respectively located on opposite sides of the skeleton in the axial direction perpendicular to the shaft through hole; The mounting end surface of the frame is located between the two cantilevers and is provided with a groove. The temperature sensor is located in the groove and is used to detect the temperature of the frame.

2. The small-volume large current transformer according to claim 1 is characterized in that: At least one layer of first insulating tape is wound between the first magnetic plate, the two magnetic arms and the outer side surfaces of the second magnetic plate.

3. The small-volume large current transformer according to claim 1 is characterized in that: At least one layer of second insulating tape is wound across and between the shielding copper foil tape and the outer side surfaces of the two magnetic arms.

4. The small-volume large current transformer according to claim 1 is characterized in that: The bottom surface of the accommodating groove is provided with a limiting groove, and the two ends of the bottom surface of the limiting groove symmetrically about the axial through hole respectively penetrate the frame to provide insertion grooves, the connecting arm is located in the accommodating groove, and one of the cantilevers is inserted into one of the insertion grooves.

5. The small-volume large current transformer according to claim 4 is characterized in that: The connecting arm is fixed in the receiving groove by epoxy resin glue.

6. The small-volume large current transformer according to claim 1, characterized in that: The skeleton is provided with a first positioning groove on a first side surface in the axial direction of the shaft through hole, and one side of the first magnetic plate is embedded in the first positioning groove.

7. The small-volume large current transformer according to claim 1 is characterized in that: The skeleton is provided with a second positioning groove on a second side surface in the axial direction of the shaft through hole, and one side of the second magnetic plate is embedded in the second positioning groove.

8. The small-volume large current transformer according to claim 1, characterized in that: A plurality of wire grooves are provided on one side of the first partition plate adjacent to the mounting end surface of the frame. The wire grooves penetrate the first partition plate in the axial direction of the shaft through hole, and at least one wire groove is provided between two adjacent pins.

9. The small-volume large current transformer according to claim 1, characterized in that: The mounting end surface of the first partition protruding from the frame is provided with a first positioning plate; And / or, a second positioning plate is provided on the mounting end surface of the second partition protruding from the frame; And / or, a third positioning plate is provided on the mounting end surface of the third partition protruding from the frame.

10. The small-volume large current transformer according to any one of claims 1 to 9, characterized in that: The Japanese-type magnetic core is formed by stacking a plurality of Japanese-type silicon steel sheets side by side in the extension direction of the cantilever, each Japanese-type silicon steel sheet is composed of an E-type support sheet and an I-type support sheet, and the E-type support sheet and the I-type support sheet are arranged alternately in the extension direction of the cantilever.

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