CN109768444B - Wiring device and wiring method suitable for litz wire - Google Patents
Wiring device and wiring method suitable for litz wire Download PDFInfo
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- CN109768444B CN109768444B CN201910033773.2A CN201910033773A CN109768444B CN 109768444 B CN109768444 B CN 109768444B CN 201910033773 A CN201910033773 A CN 201910033773A CN 109768444 B CN109768444 B CN 109768444B
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Abstract
The invention provides a wiring device and a wiring method suitable for litz wires, belongs to the technical field of electric connection, and particularly relates to a wiring device and a wiring method suitable for litz wires. The problems that the wiring terminal is overheated and the equivalent series impedance is increased under the excitation of high-frequency current are solved. The wiring harness connection device comprises a first connection terminal, a second connection terminal, a wiring harness sleeve and a using method of the wiring harness connection device. The litz wire connecting structure is mainly used for connecting the litz wire for high-frequency magnetic coupling type wireless power transmission.
Description
Technical Field
The invention belongs to the technical field of electric connection, and particularly relates to a wiring device and a wiring method suitable for litz wires.
Background
In recent years, a wireless power transmission technology is more and more widely concerned, and products applying the technology are applied and popularized in a plurality of fields such as mobile equipment charging, medical products, electric automobiles, rail transit and the like. In order to improve the transmission efficiency of a wireless power transmission system and reduce the copper loss of a coil, a plurality of insulated copper stranded wires (also called litz wires) serving as coil materials need to be optimally designed so as to reduce the equivalent series impedance of the coil under the condition of high-frequency current excitation.
Litz wires were first applied to transformer and high frequency inductor designs, limiting the eddy current intensity inside the wire by twisting multiple strands of insulated copper wires together in parallel, keeping each strand of current evenly distributed, and reducing the high frequency impedance. However, as power levels increase, litz wire with a larger number of strands and a larger wire diameter is beginning to be used. The traditional connecting terminal of the inductor coil is connected by adopting a copper flat connector or a contact pin, and the tail end of the litz wire is fixed with a metal connecting terminal after a surface insulating layer is removed by soldering tin or a chemical paint removing means. The coil using such a connector generates a large eddy current loss at the terminal position under excitation of a high-frequency current, causing the terminal to overheat. Meanwhile, because the connecting terminal has skin effect, the current distribution transmitted to each strand of wire of the litz wire is also different according to different connecting modes. The part of the insulated copper wire at the center of the wire passes much lower current than the part of the copper wire at the edge of the wire, and the effect is more obvious as the frequency of the exciting current is increased. This indirectly leads to an increase in the equivalent series impedance of the litz wire, and in order to alleviate this problem, a new type of connector suitable for high frequency and high current applications needs to be designed to ensure uniform distribution of the internal current of the litz wire and avoid overheating of the connecting terminals.
The existing litz wire joints are divided into two types, one type is a sheet-shaped connecting terminal called a copper nose and is fixed through screws and nuts; the other type is an aviation plug connected in a pin inserting mode, and the aviation plug is connected in a single pin inserting joint mode. Both of these terminals are fixed by wrapping the wire inside the terminal. The two fixing modes are equivalent to connecting a section of solid metal conductor in series between the litz wires, and under the excitation of a high-frequency circuit, the section of solid metal conductor generates a skin effect, so that the current distribution in the litz wires tends to the surface of the conductor, the current distribution in the litz wires is indirectly influenced, the current passing through the wire beams positioned in the center of the litz wires is far less than that of the edge part, the integral effective conduction area of the wire is reduced, and the conduction impedance of the coil is improved. Some enterprises choose to adopt a multi-pin connector, and a plurality of wiring pins are respectively manufactured after splitting litz wires to provide more effective conduction areas, but the method needs higher processing time and complexity and is not suitable for mass production and use. Litz wire manufacturers reduce the skin effect by using a complex stranding process, but the cost of the wire is rapidly increased due to the complexity of the stranding process.
Disclosure of Invention
The invention provides a wiring device and a wiring method suitable for litz wires, aiming at solving the problems in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a termination suitable for litz wire, it includes first binding post, second binding post and pencil sleeve pipe, first binding post and second binding post are cylindrical structure, first binding post and second binding post central part are cylindrical sleeve, first binding post is terminal to be greater than central part's cylindrical sleeve for the external diameter, the terminal cylindrical sleeve external diameter of second binding post equals with the terminal cylindrical sleeve internal diameter of first binding post, first binding post is terminal to link to each other with the terminal nestification of second binding post, the pencil sleeve pipe is the different, the same cylindrical sleeve structure of external diameter of both ends internal diameter, open in the pencil sleeve pipe cylindrical sleeve outside has the hole, pencil sleeve pipe quantity is two, is connected with first binding post and second binding post cooperation respectively.
Furthermore, the top ends of the first connecting terminal and the second connecting terminal are of flat-top conical structures.
Furthermore, the cylindrical sleeves of the central parts of the first connecting terminal and the second connecting terminal are provided with holes on the outer sides.
Furthermore, a cylindrical boss with the diameter equal to the outer diameter of the tail end of the first wiring terminal is arranged on the outer wall of the second wiring terminal.
The invention also provides a wiring method suitable for the litz wire, which comprises the following steps:
the method comprises the following steps: one end of a litz wire penetrates through one side of the small inner diameter of the wire harness sleeve;
step two: a chemical paint remover is used for performing paint removing treatment on the penetrating end of the litz wire, and the litz wire bundle subjected to paint removing is scattered and then wrapped on the top end of the first wiring terminal and the outer wall of the cylindrical structure at the central part;
step three: pushing the wire harness sleeve towards the end side, and clamping the litz wire harness through the wire harness sleeve and the first connecting terminal;
step four: injecting soldering tin into the interlayer between the wire harness sleeve and the first connecting terminal through a hole formed in the outer side of the wire harness sleeve, so that the interlayer is filled with the soldering tin;
step five: connecting the second wiring terminal with the wiring harness sleeve in a matching manner according to the method in the first step to the fourth step;
step six: and connecting the tail end of the first connecting terminal with the tail end of the second connecting terminal in a nested manner to complete the connection of the litz wire.
Compared with the prior art, the invention has the beneficial effects that: starting from the aspect of the wiring terminal, the invention designs the wiring device and the wiring method suitable for the litz wire for high-frequency magnetic coupling type wireless power transmission, improves the transmission efficiency of a wireless power transmission system, reduces the copper loss of a coil, solves the problem that the wiring terminal is overheated under the excitation of high-frequency current, and simultaneously reduces the equivalent series impedance of the wiring terminal under the excitation of the high-frequency current. The invention is more suitable for being applied to the condition of high-frequency large current, ensures the uniform distribution of the current in the litz wire and avoids the overheating of the wiring terminal. The invention has short processing time, easy operation and easy operation, and is suitable for mass production.
Drawings
FIG. 1 is a schematic view of a first connection terminal according to the present invention
FIG. 2 is a schematic view of a second connection terminal according to the present invention
FIG. 3 is a schematic view of the structure of the harness sleeve according to the present invention
FIG. 4 is a schematic diagram of a first step in a litz wire connection method according to the present invention
FIG. 5 is a schematic diagram of a second step in the litz wire connection method according to the present invention
FIG. 6 is a schematic diagram of the third step and the fourth step in the connection method for litz wire according to the present invention
FIG. 7 is a schematic diagram of the fifth step in the litz wire connection method according to the present invention
FIG. 8 is a schematic diagram of the sixth step in the litz wire connection method according to the present invention
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely explained below with reference to the drawings in the embodiments of the present invention.
Referring to fig. 1-8 for illustrating the present embodiment, a wiring device for litz wire includes a first connection terminal, a second connection terminal and a harness sleeve, the first connecting terminal and the second connecting terminal are both cylindrical structures, the central parts of the first connecting terminal and the second connecting terminal are both cylindrical sleeves, the tail end of the first wiring terminal is a cylindrical sleeve with the outer diameter larger than that of the central part, the outer diameter of the cylindrical sleeve at the tail end of the second wiring terminal is equal to the inner diameter of the cylindrical sleeve at the tail end of the first wiring terminal, the tail end of the first connecting terminal is connected with the tail end of the second connecting terminal in a nested manner, the wiring harness sleeve is of a cylindrical sleeve structure with two ends having different inner diameters and the same outer diameter, the wire harness sleeve is characterized in that a hole is formed in the outer side of the cylindrical sleeve of the wire harness sleeve, and the number of the wire harness sleeves is two, and the wire harness sleeves are respectively connected with the first wiring terminal and the second wiring terminal in a matched mode.
The top ends of the first connecting terminal and the second connecting terminal are both of a flat-top conical structure, and the flat-top conical structure is designed to ensure that the litz wire is bent at a smooth angle when being connected with the connecting terminals, so that a single-stranded thin wire cannot be broken. The holes are formed in the outer sides of the cylindrical sleeves of the central parts of the first connecting terminal and the second connecting terminal, and the formed holes are used for preventing cavities from being generated due to closed air in the tin soldering process, so that the connecting effect is reduced. And a cylindrical boss with the diameter equal to the outer diameter of the tail end of the first wiring terminal is arranged on the outer wall of the second wiring terminal, so that the second wiring terminal can be conveniently connected with the wiring terminal. The holes formed in the outer side of the wire harness sleeve are convenient for pouring soldering tin into the litz wire after the litz wire is fixed for reinforcement.
The invention also provides a wiring method suitable for the litz wire, which comprises the following steps:
the method comprises the following steps: one end of a litz wire penetrates through one side of the small inner diameter of the wire harness sleeve;
step two: a chemical paint remover is used for performing paint removing treatment on the penetrating end of the litz wire, and the litz wire bundle subjected to paint removing is scattered and then wrapped on the top end of the first wiring terminal and the outer wall of the cylindrical structure at the central part;
step three: pushing the wire harness sleeve towards the end side, and clamping the litz wire harness through the wire harness sleeve and the first connecting terminal;
step four: injecting soldering tin into the interlayer between the wire harness sleeve and the first connecting terminal through a hole formed in the outer side of the wire harness sleeve, so that the interlayer is filled with the soldering tin;
step five: connecting the second wiring terminal with the wiring harness sleeve in a matching manner according to the method in the first step to the fourth step;
step six: and connecting the tail end of the first connecting terminal with the tail end of the second connecting terminal in a nested manner to complete the connection of the litz wire.
In the third step, in the process that the wire harness sleeve is pushed towards the end side, the wire harness sleeve is gradually close to the first connecting terminal, so that the distance between the wire harness sleeve and the first connecting terminal is narrowed, the litz wire harness is clamped, soldering tin is poured into an interlayer in the fourth step to ensure that the first connecting terminal and the litz wire are fully contacted and play a role in fixing, the fifth step is to replace the first connecting terminal in the first step to the fourth step with a second connecting terminal, the second connecting terminal and the wire harness sleeve are matched and connected in the same method, and the sixth step is to connect the two connecting terminals to form a nesting effect, so that the litz wire is connected.
The above is a detailed description of the connection device and the connection method for litz wires provided by the present invention, and the principle and the implementation of the present invention are explained by applying specific examples, and the description of the above examples is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (5)
1. A termination device adapted for litz wire, comprising: the wire harness sleeve is of a cylindrical sleeve structure with different inner diameters at two ends and the same outer diameter, the outer side of the cylindrical sleeve of the wire harness sleeve is provided with a hole, the wire harness sleeves are two in number and are respectively connected with the first wiring terminal and the second wiring terminal in a matching way, litz wires penetrate through the wire harness sleeve and are respectively wrapped on the top ends of the first wiring terminal and the second wiring terminal and the outer wall of the cylindrical sleeve of the central part, the small inner diameter end of the wire harness sleeve is respectively matched with the central parts of the first connecting terminal and the second connecting terminal in a cylindrical mode to clamp the litz wire.
2. A termination arrangement for litz wire according to claim 1, characterized in that: the top ends of the first connecting terminal and the second connecting terminal are both of a flat-top conical structure.
3. A termination arrangement for litz wire according to claim 1, characterized in that: the outer sides of the cylindrical sleeves at the central parts of the first connecting terminal and the second connecting terminal are provided with holes.
4. A termination arrangement for litz wire according to claim 1, characterized in that: and a cylindrical boss with the diameter equal to the outer diameter of the tail end of the first wiring terminal is arranged on the outer wall of the second wiring terminal.
5. A wiring method of the litz wire wiring device according to claim 1, characterized in that: it comprises the following steps:
the method comprises the following steps: one end of a litz wire penetrates through one side of the small inner diameter of the wire harness sleeve;
step two: a chemical paint remover is used for performing paint removing treatment on the penetrating end of the litz wire, and the litz wire bundle subjected to paint removing is scattered and then wrapped on the top end of the first wiring terminal and the outer wall of the cylindrical sleeve at the central part;
step three: pushing the wire harness sleeve towards the end side, and clamping the litz wire harness through the wire harness sleeve and the first connecting terminal;
step four: injecting soldering tin into the interlayer between the wire harness sleeve and the first connecting terminal through a hole formed in the outer side of the wire harness sleeve, so that the interlayer is filled with the soldering tin;
step five: connecting the second wiring terminal with the wiring harness sleeve in a matching manner according to the method in the first step to the fourth step;
step six: and connecting the tail end of the first connecting terminal with the tail end of the second connecting terminal in a nested manner to complete the connection of the litz wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910033773.2A CN109768444B (en) | 2019-01-15 | 2019-01-15 | Wiring device and wiring method suitable for litz wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910033773.2A CN109768444B (en) | 2019-01-15 | 2019-01-15 | Wiring device and wiring method suitable for litz wire |
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| Publication Number | Publication Date |
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| CN109768444A CN109768444A (en) | 2019-05-17 |
| CN109768444B true CN109768444B (en) | 2020-10-16 |
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| CN201910033773.2A Active CN109768444B (en) | 2019-01-15 | 2019-01-15 | Wiring device and wiring method suitable for litz wire |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112404626B (en) * | 2020-10-14 | 2022-05-03 | 许继变压器有限公司 | Litz wire welding device |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009019652A (en) * | 2007-07-10 | 2009-01-29 | Shigeo Kawasaki | Pipe joint |
| CN101453061B (en) * | 2007-11-28 | 2010-12-08 | 健和兴端子股份有限公司 | Easy inserting type conductive wire connector and method for preparing the same |
| JP2012104396A (en) * | 2010-11-11 | 2012-05-31 | Yazaki Corp | Method of connecting crimp terminal of aluminum conductor, and method of connecting crimp terminal of aluminum wire |
| CN102683910B (en) * | 2012-05-19 | 2014-02-05 | 林锐涛 | Conical connecting device for tubular bus bar and connecting method thereof |
| CN203312469U (en) * | 2013-06-25 | 2013-11-27 | 欧托凯勃汽车线束（太仓）有限公司 | Copper-aluminum joint |
| CN104852344B (en) * | 2015-04-22 | 2017-04-12 | 国家电网公司 | Electric connection component of European-style cable branch box |
| CN206364277U (en) * | 2017-01-14 | 2017-07-28 | 深圳市鑫海林电子科技有限公司 | A kind of water repellent component |
| CN206461100U (en) * | 2017-01-24 | 2017-09-01 | 南京康尼新能源汽车零部件有限公司 | A kind of aluminum conductor creep resistant crimp type terminal |
| CN206802559U (en) * | 2017-03-01 | 2017-12-26 | 杨宾 | A kind of Quick Connect Kit |
| CN207530127U (en) * | 2017-11-27 | 2018-06-22 | 北京铁路信号有限公司 | A kind of conducting wire straight line connection structure |
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