阅读说明：本技术 互感器与接线端纽的连接结构、其制造方法及其仪表 (Connection structure of mutual inductor and wiring terminal button, manufacturing method thereof and instrument thereof ) 是由 朱永虎 姚昱 于 2019-11-05 设计创作，主要内容包括：本发明涉及互感器与接线端纽的连接结构、其制造方法及其仪表,包括互感器、一次电流线以及接线端钮,所述接线端钮的轴向一端设有用以对接一次电流线的连接孔,所述接线端钮的轴向另一端设有供外部电性连接的接线孔,所述接线端纽的连接孔内侧壁设有咬合齿；所述互感器套接于所述一次电流线上；所述一次电流线插接于所述连接孔内,且所述咬合齿的硬度大于一次电流线的硬度,接线端钮的连接孔受到外部机械压制后,所述咬合齿向内完全嵌入一次电流线内用以实现或接近零电阻接触。如此设置,可节约电能、降低互感器的制造成本且是提高连接一致性,使用电稳定可靠。(The invention relates to a connection structure of a mutual inductor and a wiring end button, a manufacturing method and an instrument thereof, wherein the connection structure comprises the mutual inductor, a primary current wire and a wiring end button, wherein one axial end of the wiring end button is provided with a connection hole for butting the primary current wire, the other axial end of the wiring end button is provided with a wiring hole for external electrical connection, and the inner side wall of the connection hole of the wiring end button is provided with an occlusion tooth; the mutual inductor is sleeved on the primary current line; the primary current wire is inserted into the connecting hole, the hardness of the meshing teeth is greater than that of the primary current wire, and after the connecting hole of the wiring terminal button is pressed by external machinery, the meshing teeth are inwards and completely embedded into the primary current wire to realize or approach zero resistance contact. So set up, can practice thrift the electric energy, reduce the manufacturing cost of mutual-inductor and improve the connection uniformity, it is reliable and stable to use the electricity.)

1. The utility model provides a connection structure of mutual-inductor and wiring end button, includes mutual-inductor, primary current line and wiring end button, its characterized in that:

the axial end of the wiring terminal button is provided with a connecting hole for butting a primary current line, the axial other end of the wiring terminal button is provided with a wiring hole for external electrical connection, and the inner side wall of the connecting hole of the wiring terminal button is provided with occlusion teeth;

the mutual inductor is sleeved on the primary current line;

the primary current wire is inserted into the connecting hole, the hardness of the meshing teeth is greater than that of the primary current wire, and after the connecting hole of the wiring terminal button is pressed by external machinery, the meshing teeth are inwards and completely embedded into the primary current wire to realize or approach zero resistance contact.

2. The connection structure of the mutual inductor and the terminal button according to claim 1, wherein: the primary current linear hardness is 70 +/-10 Vickers.

3. The connection structure of the mutual inductor and the terminal button according to claim 1, wherein: the primary current wire is annealed by adopting red copper, brass, aluminum or aluminum alloy as a raw material until the hardness of the raw material is 70 +/-10 Vickers.

4. The connection structure of the mutual inductor and the terminal button according to claim 1, wherein: the hardness of the occlusion teeth is 140-170 Vickers.

5. The connection structure of the mutual inductor and the terminal button according to claim 1, wherein: the utility model discloses a fixed screw hole that is used for instrument shell mutually fixed, including wiring end knob, connecting hole and wiring hole, the wiring end knob radially is equipped with the wiring fastening screw hole that is linked together with the wiring hole, be used for grafting outside electric power input and output line in the wiring hole, wiring fastening screw hole is used for supplying the screw to peg graft fixedly outside electric power input and output line, the wiring end knob radially is equipped with the fixed screw hole that is used for with instrument shell mutually fixed, the connecting hole just does not communicate with each other with the wiring hole back.

6. The connection structure of the mutual inductor and the terminal button according to claim 5, wherein: the terminal button of working a telephone switchboard is equipped with the main part and is located the columnar body of main part front end, the connecting hole is sunken backward from the columnar body front end and forms, the columnar body outside receives outside mechanical pressing back to be the polygon.

7. The connection structure of the mutual inductor and the terminal button according to claim 6, wherein: the diameter of the primary current line is phi 3.5-6.0 mm, the diameter of the connecting hole thread is M4.0-7.0 mm, and the outer diameter of the columnar body is phi 7.0-12.5 mm.

8. The connection structure of the mutual inductor and the terminal button according to claim 1, wherein: the mutual inductor is a current mutual inductor, a voltage mutual inductor or a power sensor.

9. A meter, characterized by: the instrument comprises an instrument shell, wherein a metering device, a metering display device and the connection structure of the mutual inductor and the terminal button according to any one of claims 1 to 8 are arranged in the instrument shell.

10. A manufacturing method of a connection structure of a mutual inductor and a terminal button is characterized in that: a connecting structure for a mutual inductor and a terminal button according to any one of claims 1 to 8, the manufacturing method comprising:

step A, manufacturing the wiring terminal knob, wherein a connecting hole and occlusion teeth positioned in the connecting hole are arranged on the wiring terminal knob;

b, manufacturing the primary current wire, and annealing the primary current wire to enable the hardness of the occlusion teeth to be larger than that of the primary current wire;

step C, inserting a primary current wire into the connecting hole of the wiring terminal button, and enabling the occlusion teeth to surround the outer side of the primary current wire;

and D, performing external mechanical pressing on the terminal button of the connecting wire to enable the meshing teeth of the connecting hole to be embedded into the primary current wire to realize or approach zero resistance contact.

Technical Field

The invention relates to a connection structure of a mutual inductor and a wiring terminal button in an instrument, a manufacturing method thereof and the instrument, in particular to a connection structure of a mutual inductor and a wiring terminal button, a manufacturing method thereof and the instrument, which are suitable for the field of electric energy transmission.

Background

Transformers are widely used in the field of electronics and automation control, such as communication systems, measurement or metering components. Therefore, the connection structure of the mutual inductor and the terminal has a wide market in the global range, and the annual sales of the products in the global range exceed five billion dollars according to incomplete statistics.

Disclosure of Invention

The invention aims to provide a connection structure of a mutual inductor and a wiring terminal button, a manufacturing method thereof and an instrument thereof, wherein the connection structure can save electric energy, reduce the manufacturing cost of the mutual inductor and improve the connection consistency, and is stable and reliable.

In order to achieve the technical purpose, the invention adopts the following technical modes: a connection structure of a mutual inductor and a wiring terminal button comprises the mutual inductor, a primary current wire and a wiring terminal button, wherein a connection hole for butting the primary current wire is formed in one axial end of the wiring terminal button, a wiring hole for external electrical connection is formed in the other axial end of the wiring terminal button, and meshing teeth are arranged on the inner side wall of the connection hole of the wiring terminal button; the mutual inductor is sleeved on the primary current line; the primary current wire is inserted into the connecting hole, the hardness of the meshing teeth is greater than that of the primary current wire, and after the connecting hole of the wiring terminal button is pressed by external machinery, the meshing teeth are inwards and completely embedded into the primary current wire to realize or approach zero resistance contact.

As a further improvement of the invention, the primary current linear hardness is 70 +/-10 Vickers.

As a further improvement of the invention, the primary current wire is annealed by adopting red copper, brass, aluminum or aluminum alloy as a raw material, and the raw material is annealed until the hardness is 70 +/-10 Vickers.

As a further improvement of the invention, the hardness of the occlusion teeth is 140-170 Vickers.

As a further improvement of the present invention, the connection terminal button is radially provided with a connection fastening screw hole communicated with the connection hole, the connection hole is used for inserting an external power input and output line, the connection fastening screw hole is used for a screw to insert and fix the external power input and output line, the connection terminal button is radially provided with a fixing screw hole for fixing with the instrument case, the connection hole is opposite to and not communicated with the connection hole, and the engagement tooth is a spiral thread.

As a further improvement of the present invention, the terminal button is provided with a main body portion and a cylindrical body located at the front end of the main body portion, the connection hole is formed by recessing backward from the front end of the cylindrical body, and the outer side of the cylindrical body is polygonal after being mechanically pressed by the outside.

As a further improvement of the invention, the diameter of the primary current wire is phi 3.5-6.0 mm, the diameter of the connecting hole thread is M4.0-7.0 mm, and the outer diameter of the columnar body is phi 7.0-12.5 mm.

As a further improvement of the invention, the mutual inductor is a current mutual inductor, a voltage mutual inductor or an electric power sensor.

In order to achieve the technical purpose, the invention can also adopt the following technical modes:

the instrument comprises an instrument shell, wherein a metering device, a metering display device and the connection structure of the mutual inductor and the wiring end button are arranged in the instrument shell.

In order to achieve the technical purpose, the invention can also adopt the following technical modes:

a manufacturing method of a connection structure of a mutual inductor and a terminal button is used for manufacturing the connection structure of the mutual inductor and the terminal button, and the manufacturing method comprises the following steps:

step A, manufacturing the wiring terminal knob, wherein a connecting hole and occlusion teeth positioned in the connecting hole are arranged on the wiring terminal knob;

b, manufacturing the primary current wire, and annealing the primary current wire to enable the hardness of the occlusion teeth to be larger than that of the primary current wire;

step C, inserting a primary current wire into the connecting hole of the wiring terminal button, and enabling the occlusion teeth to surround the outer side of the primary current wire;

and D, performing external mechanical pressing on the terminal button of the connecting wire to enable the meshing teeth of the connecting hole to be embedded into the primary current wire to realize or approach zero resistance contact.

Compared with the prior art, the hardness of the occluding teeth on the inner side wall of the connecting hole of the wiring terminal button is greater than that of the primary current wire, and after the connecting hole of the wiring terminal button is pressed by external machinery, the occluding teeth are inwards and completely embedded into the primary current wire to realize or approach zero resistance contact. According to the arrangement, when the connecting hole is compressed and contracted by external mechanical pressure, the meshing teeth with higher hardness on the inner side wall of the connecting hole can be easily embedded into the primary current wire with lower hardness, almost complete close and seamless contact between the meshing teeth and the primary current wire is achieved, and the meshing teeth are completely embedded, so that on one hand, the contact area between the primary current wire and the connecting hole can be further increased in the radial direction; on the other hand, the axial limiting function of the occlusion teeth can effectively prevent the primary current line from axially extending after being extruded, so that the contact resistance of the connection between the primary current line and the wiring terminal button can be reduced, almost zero resistance contact is realized, the optimal selection for ensuring the working state stability of the connection structure is realized, the use power consumption is reduced, and the electric energy resource is saved; on the other hand, the manufacturing cost of the mutual inductor can be reduced, the connection consistency is improved, and the use electricity is stable and reliable.

Drawings

FIG. 1 is a schematic view of a terminal of the present invention;

fig. 2 is a sectional view showing the structure of the terminal block of fig. 1 according to the present invention.

FIG. 3 is a schematic structural view of a connection structure of a transformer and a terminal button of the present invention before assembly;

FIG. 4 is a schematic structural view of the connection structure of the mutual inductor and the terminal button of the present invention after assembly;

FIG. 5 is a schematic view showing a structure in which the connection structure of the instrument transformer and the terminal button of the present invention is incorporated into a meter terminal box.

Fig. 6 is an exploded view of the instrument transformer of the present invention.

Fig. 7 is a schematic diagram of the framework of the power meter of the present invention.

Reference numerals:

connection structure 100 of mutual inductor and connection terminal

Mutual inductor 1 plastic casing 11

Hole 13 in magnetic core 12

Secondary current line 14 leading out line 15

Primary current wire 2 connection terminal 3

Front end face 311 of main body 31

Rear end face 312 flat surface 313

Arc surface 314 wiring hole 315

Binding post fastening screw hole 316 fixing screw hole 317

Cylindrical body 32 connecting hole 321

Inner sidewall 322 engaging teeth 323

Terminal box 4 screw 5

Meter 40 Meter housing 41

Metering device 42 metering display device 43

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be considered a part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the field of mutual inductor application, as a supplier skilled in market demand in the industry, the feada electronics limited company well understands the problems in the prior art, and the research and development team thereof further invests huge investment on the original technology owned by the supplier, performs a long-time and large-scale experiment, scheme screening and a large amount of customer investigation, and finally obtains the technical scheme of the invention.

Fig. 1 to 6 are schematic structural views of a connection structure 100 between a transformer 1 and a terminal knob 3 according to the present invention. A connection structure 100 of a mutual inductor 1 and a terminal knob 3 comprises the mutual inductor 1, a primary current wire 2 and the terminal knob 3.

A connecting hole 321 for butting the primary current line 2 is formed at one axial end of the terminal knob 3, a connecting hole 315 for electrically connecting an external part such as an input/output line (not shown) is formed at the other axial end of the terminal knob 3, and engaging teeth 323 are formed on an inner side wall 322 of the connecting hole 321 of the terminal knob 3;

the mutual inductor 1 is sleeved on the primary current wire 2;

the primary current wire 2 is inserted into the connecting hole 321, the hardness of the meshing tooth 323 is greater than that of the primary current wire 2, and after the connecting hole 321 of the terminal knob 3 is pressed by external machinery, the meshing tooth 323 is completely embedded into the primary current wire 2 to achieve or approach zero resistance contact.

With the arrangement, when the connection hole 321 is compressed and contracted by external mechanical pressure, the meshing teeth 323 with higher hardness on the inner side wall 322 of the connection hole 321 can be easily embedded into the primary current wire 2 with lower hardness, so that almost complete close and seamless contact between the two is achieved. The complete embedding of the meshing teeth 323 can further increase the contact area between the primary current line 2 and the connecting hole 321 in the radial direction; on the other hand, the axial limiting function of the meshing teeth 323 can effectively prevent the primary current line 2 from axially extending after being extruded, so that the contact resistance between the primary current line 2 and the terminal knob 3 can be reduced, almost zero resistance contact is achieved, the optimal selection for ensuring the stability of the working state of the connection structure is achieved, the use power consumption is reduced, and the electric energy resource is saved. In the transformer 1, as can be seen from the ampere-loop law, the product of the magnetic field strength along the magnetic circuit and the average length of the magnetic circuit is equal to the magnetomotive force, that is, the product of the exciting current and the number of turns of the exciting coil, and thereby the magnetic field strength in the toroidal coil can be deduced, that is, the formula H is NI/L, where H is the magnetic field strength, N is the number of turns of the secondary current wire 14, I is the exciting current, and L is the average length of the magnetic circuit, and it is proved in the formula that the L can be reduced to increase the high magnetic field strength in the coil without changing NI, and the average magnetic circuit length L of the core 12 of the transformer 1 is closely related to the inner diameter and the outer diameter of the core 12, and in the transformer 1 having the same rated performance indexes, the inner diameter and the outer diameter of the core 12 can be reduced after the contact resistance; therefore, the average length of the magnetic circuit of the magnetic core 12 is reduced, the size of the mutual inductor 1 is reduced, the material of the magnetic core 12 of the mutual inductor 1 is reduced, the length of the secondary coil of the mutual inductor 1 is shortened, and the internal resistance of the coil of the mutual inductor 1 is reduced, so that the performance of the mutual inductor 1 is improved, and meanwhile, the manufacturing cost of the mutual inductor 1 can also be reduced.

Through a large number of experiments, the optimal hardness value of the primary current line 2 is 70 +/-10 Vickers. With such an arrangement, when the outside of the connection hole 321 of the terminal pin 3 is mechanically pressed, the engaging teeth 323 can be easily embedded into the primary current line 2, so as to achieve the optimal engagement and the optimized contact resistance.

Specifically, the primary current line 2 needs to be made of a low-resistance material, but the existing low-resistance material does not meet the hardness requirement, wherein the resistivity of the red copper is 0.018 Ω · mm²The hardness is as high as 120 +/-10 Vickers, and the primary current wire 2 is adopted by the inventionThe red copper is used as a raw material to be annealed, and the hardness of the red copper is maintained to 70 +/-10 Vickers through the annealing treatment. In this way, the low resistance requirement is met, and the hardness requirement is met, so that the primary current wire 2 is brought into or close to zero resistance contact with the terminal stud 3.

In another preferred embodiment of the present invention, brass, aluminum or an aluminum alloy may be selected as a raw material, and the raw material may be annealed to maintain the hardness to 70 ± 10 vickers.

The hardness of the occlusion teeth 323 can be 140 to 170 Vickers in cooperation with the primary current wire 2. Namely, the hardness of the material used for the occlusion teeth 323 is 140 to 170 Vickers. Thus, after the engaging teeth 323 are mechanically pressed externally, the engaging teeth 323 can be easily embedded in the primary current line 2, and the engaging teeth 323 themselves are not deformed by the mechanical pressing.

Preferably, the terminal knob 3 is made of H55-H68 brass, so that the hardness of the engaging teeth 323 is 140-170 Vickers.

In the illustrated embodiment, the biting teeth 323 are helical threads. Thus, the thread is easy to machine and form, and is uniformly distributed, so that the meshing teeth 323 can be uniformly and tightly meshed with the primary current line 2 after being pressed by external machinery. Of course, in other embodiments of the present invention, other shapes and/or arrangements of the engaging teeth 323 may be used, as long as the protruding shape can be embedded into the primary current line 2.

Referring to fig. 1 to 2, which are schematic structural views of a terminal pin 3, the terminal pin 3 is radially provided with a terminal fastening screw hole 316 communicated with a terminal hole 315, the terminal hole 315 is used for inserting an external power input and output line, and the terminal fastening screw hole 316 is used for fixing the external power input and output line by screw insertion, so that the external power input and output line can be stably electrically connected with the terminal pin 3; the connection terminal 3 is provided with a fixing screw hole 317 for fixing with the meter casing 4 in the radial direction, in this embodiment, the fixing screw hole 317 is fixed with the connection terminal box 4, so that the connection structure of the transformer 1 and the connection terminal 3 can be stably fixed on the meter casing 4. In the present embodiment, the meter case 4 is embodied as a terminal box. Connecting hole 321 is carried on the back with wiring hole 315 and does not communicate with each other, can stop the outside air of instrument from the technology and get into the instrument inside, corrodes the inside components and parts of instrument, extension instrument life.

The terminal pin 3 is provided with a main body 31 and a column 32 located at the front end of the main body 31, the connection hole 321 is formed by recessing the front end of the column 32 backward, and the outer side of the column 32 is polygonal after being pressed by external machinery. With this arrangement, the cylindrical body 32 can more uniformly contract the connection 321 inward after being pressed in multiple directions. It is noted that the polygon may be a regular polygon or an irregular polygon. Of course, in other embodiments of the present invention, the shape may be circular or any other regular or irregular shape.

In different embodiments of the present invention, the transformer 1 may be a current transformer, a voltage transformer or a power sensor. As long as the current on the primary current line 2 can be measured.

Referring to fig. 7, the present invention also provides a meter 40, especially an electric energy meter, including a frame-shaped meter housing 41, a metering device 42 for converting and metering the detection data transmitted from the secondary current line 14, a metering display device 43 for displaying the electricity consumption data to the user, and a connection structure 100 between the transformer 1 and the terminal knob 3, which are arranged in the meter housing 41.

Through specific experiments, when the diameter of the primary current wire 2 is phi 3.5-6.0 mm, the diameter of the connecting hole 321 is M4.0-7.0 mm, the depth of the connecting hole 321 is 10.0-8.0 mm, the outer diameter of the columnar body 32 is phi 7.0-12.5mm, and the contact resistance of the connection of the terminal button 3 and the primary current wire 2 is ideal and is 0-5u omega.

The experimental data are as follows: