CN110890200B

CN110890200B - Mutual inductor, packaging manufacturing method thereof and electric instrument thereof

Info

Publication number: CN110890200B
Application number: CN201911073500.7A
Authority: CN
Inventors: 朱永虎; 姚昱
Original assignee: Tongxiang Weida Electronics Co ltd; Zhejiang Yongtailong Electronic Co ltd
Current assignee: Tongxiang Weida Electronics Co ltd; Zhejiang Yongtailong Electronic Co ltd
Priority date: 2019-11-05
Filing date: 2019-11-05
Publication date: 2020-10-27
Anticipated expiration: 2039-11-05
Also published as: KR102615056B1; WO2021088194A1; CN110890200A; KR20220060527A

Abstract

The invention discloses a mutual inductor, a packaging manufacturing method thereof and an electric power instrument thereof, comprising a mutual inductor shell, an annular magnetic core accommodated in the mutual inductor shell, and a secondary current wire accommodated in the mutual inductor shell and wound on the annular magnetic core, wherein the annular magnetic core comprises a magnetic core shell and an ultramictic magnetic core in the magnetic core shell, the mutual inductor shell comprises a hard material part and a soft material part which are integrally arranged, the hard material part and the soft material part jointly form an annular accommodating cavity with a closed bottom, the outer side wall is a part of the hard material part, the inner side wall is a part of the soft material part, a through hole is formed inside the inner side wall for the primary current wire to pass through, a soft interference part for abutting and interfering the primary current wire is protruded inwards the through hole inside the inner side wall, and the soft material part is made of a high-temperature resistant material, and the annular accommodating cavity is filled with packaging materials. Therefore, the vibration prevention and glue leakage prevention functions of the ultracrystalline magnetic core mutual inductor can be realized.

Description

Mutual inductor, packaging manufacturing method thereof and electric instrument thereof

Technical Field

The invention relates to the technical field of mutual inductors, in particular to a mutual inductor for electric power instrument metering, a packaging manufacturing method thereof and an electric power instrument thereof.

Background

The mutual inductor is a device for isolating electric parameters, adopting, metering or measuring, is particularly suitable for electronic power instruments, and the miniature current (voltage) mutual inductor product almost covers all aspects of the application of the whole electric energy system.

The current power transformers widely used in the power field have very strict requirements on magnetic core materials, such as high magnetic indexes (such as high magnetic permeability, high saturation magnetic induction, low loss and the like), and the whole magnetization curve of the magnetic core materials is required to meet certain conditions so as to ensure the precision of the transformers in the whole measurement range. In recent years, the use of amorphous microcrystalline alloys as transformer cores has attracted increasing attention by those skilled in the art.

Amorphous means that when the solidification rate of the metal or alloy is very fast (e.g., up to one million degrees per second of cooling rate is used to solidify the iron-boron alloy melt), the atoms are frozen in too close an arrangement, and the final arrangement of atoms resembles a liquid and is disordered, which is an amorphous alloy. Compared with the traditional metal magnetic material, the amorphous alloy has disordered atomic arrangement, no crystal anisotropy and high resistivity, so that the amorphous alloy has high magnetic permeability and low loss, and the magnetic performance of the amorphous alloy is actually the most important application field of the amorphous alloy so far. In addition, the amorphous alloy has a wide chemical composition range compared to other magnetic materials, and can easily obtain desired magnetic properties by different subsequent processes even for the same material. Therefore, the magnetic performance of the amorphous alloy is very flexible, the choice is large, and convenience is provided for material selection of power electronic components. On the other hand, the amorphous manufacturing process is energy-saving and environment-friendly, and because the traditional thin steel plate is manufactured from steel making, casting, steel ingot cogging, blooming, annealing, hot rolling, annealing, acid pickling, finish rolling and shearing to a thin plate finished product, a plurality of process links and dozens of working procedures are needed. Because of many links and complex process, the traditional steel enterprises are energy-consuming households and pollution-causing households, and are called as 'water tigers' and 'electric tigers'. The amorphous alloy is manufactured by directly spraying the strip after steel making, and a thin strip finished product is manufactured by only one step, so that the process is greatly simplified, a large amount of precious energy is saved, and meanwhile, no pollutant is discharged, and the method is very favorable for environmental protection. The amorphous alloy is energy-saving in the manufacturing process, has excellent magnetic property, reduces loss in the using process of related instruments and is called as a green material and a material of twenty-first century.

However, the amorphous strip has a limitation in its application because it is embrittled due to structural relaxation and the like during heat treatment, has poor toughness, is easily broken when subjected to an external force, and has a reduced soft magnetic property.

In view of the above, it is desirable to design a transformer having better magnetic index and better stability to overcome the above technical problems.

Disclosure of Invention

In order to solve the above technical problems, the present invention provides a transformer having a better magnetic index and a better stability, a package manufacturing method thereof, and an electric power meter thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

a mutual inductor is used for being sleeved on a primary current wire, the mutual inductor comprises a mutual inductor shell, an annular magnetic core contained in the mutual inductor shell, a secondary current wire contained in the mutual inductor shell and wound on the annular magnetic core, the annular magnetic core comprises a magnetic core shell and an ultracrystalline magnetic core contained in the magnetic core shell, the mutual inductor shell comprises a rigid material part and a soft material part which are integrally arranged, the rigid material part and the soft material part jointly form an annular containing cavity with closed bottom, the annular containing cavity comprises an annular bottom wall, an outer side wall surrounding the outer side of the annular bottom wall and an inner side wall surrounding the middle part of the annular bottom wall, the annular magnetic core is attached to the annular bottom wall, the inner side wall is sleeved on the outer side of the inner side wall and is contained on the inner side of the outer side wall, the outer side wall is a part of the rigid material part, and the inner side, the inner side of the inner side wall is provided with a through hole for the primary current wire to pass through, the inner side wall extends inwards the through hole to form a soft interference part for abutting and interfering the primary current wire, the soft material part is made of high-temperature-resistant material, and the annular accommodating cavity is filled with packaging material for fixing the annular magnetic core.

As a further improvement of the present invention, the hard material portion includes an annular bottom end wall extending from the outer side wall to the through hole, the annular bottom end wall is provided with a central hole corresponding to the through hole for passing a primary current line, the soft material portion includes an annular bottom plate extending from the inner side wall to the outer side wall, and the bottom end wall and the bottom plate are integrally formed into an annular bottom wall.

As a further improvement of the invention, a plurality of small columns surrounding and distributed on the outer side of the middle hole are arranged on the bottom end wall, a plurality of hole parts surrounding and distributed on the outer side of the inner side wall penetrate through the annular chassis, and the hole parts penetrate and are fixed on the small columns.

As a further improvement of the invention, a cap part for covering the chassis and preventing the chassis from being separated from the small column body is integrally extended from the top of the small column body.

As a further improvement of the present invention, the annular bottom plate is embedded and molded inside the bottom end wall.

As a further improvement of the invention, the annular chassis is provided with hole parts which are arranged outside the inner side wall in a surrounding mode in a penetrating mode, and the hole parts are embedded in the bottom end wall.

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

the utility model provides an electric power instrument, includes electric power instrument shell, is located metering device, measurement display device and mutual-inductor and the connection structure of wiring terminal button in electric power instrument shell, its characterized in that: mutual-inductor and connection terminal's connection structure includes above-mentioned mutual-inductor, wears to establish last current line of mutual-inductor and electric connection in terminal on the current line of once, terminal includes the main part and the columnar body that extends forward from the main part, the columnar body is sunken to have the connecting hole forward backward from, the main part is equipped with the wiring hole sunken forward backward from, carry on the back mutually and not intercommunicate around connecting hole and the wiring hole, the current line of once wears to locate in the connecting hole.

a package manufacturing method of a mutual inductor is used for manufacturing the mutual inductor, and comprises the following steps:

respectively manufacturing a hard material part, a soft material part and an annular magnetic core wound with a secondary current wire coil, wherein the annular magnetic core comprises a magnetic core shell and an ultracrystalline magnetic core accommodated in the magnetic core shell, the hard material part comprises a bottom end wall with a middle hole and an outer side wall surrounding the outer side of the bottom end wall, and a plurality of small columns surrounding the middle hole are arranged on the bottom end wall; the flexible material part comprises a columnar hollow inner side wall and an annular chassis extending outwards from the inner side wall, a through hole is formed in the inner side wall and used for a primary current wire to pass through, the inner side wall extends inwards the through hole and used for abutting against a flexible interference part interfering the primary current wire, the flexible material part is made of a high-temperature-resistant material, and hole parts distributed on the outer side of the inner side wall are arranged on the annular chassis in a penetrating mode;

tightly attaching the annular base plate to the bottom end wall, and fixing the hole part on the small column body in a penetrating manner to form an annular accommodating cavity with a sealed bottom;

assembling the annular magnetic core wound with the secondary current wire coil into the annular accommodating cavity;

and pouring packaging material into the annular accommodating cavity to complete the packaging.

As a further improvement of the present invention, the method for manufacturing a package of a transformer further includes the steps of fixing the hole to the small column by piercing, ultrasonic caulking the small column to form a flat cap integrally extending on the top of the small column, and caulking the small column to the chassis by piercing the hole.

a package manufacturing method of a mutual inductor is used for the mutual inductor, and comprises the following steps:

manufacturing an annular magnetic core wound with a secondary current wire coil, wherein the annular magnetic core comprises a magnetic core shell and an ultracrystalline magnetic core accommodated in the magnetic core shell;

the mutual inductor shell is formed by a bicolor plastic injection machine in one step and comprises two different soft and hard materials, the mutual inductor shell comprises a hard material part and a soft material part, the soft material part comprises a columnar hollow inner side wall and an annular base plate which extends outwards from the inner side wall, a through hole is formed in the inner side wall and is used for a primary current line to pass through, the inner side wall extends inwards the through hole and is used for abutting against a soft interference part which interferes with the primary current line, the soft material part is made of a high-temperature-resistant material, the hard material part comprises a bottom end wall with a middle hole and an outer side wall which is arranged on the outer side of the bottom end wall in a surrounding mode, and the base plate is embedded in the bottom end wall in an injection molding mode, so that the inner side;

Compared with the prior art, the annular magnetic core comprises a magnetic core shell and an ultracrystalline magnetic core accommodated in the magnetic core shell, the transformer shell comprises a hard material part and a soft material part which are integrally arranged, the hard material part and the soft material part form an annular accommodating cavity with a closed bottom, the soft material part is provided with a soft interference part used for abutting and interfering the primary current wire, the soft material part is made of a high-temperature-resistant material, and an encapsulation material used for fixing the annular magnetic core is filled in the annular accommodating cavity. So set up, can realize the antivibration and the leak protection of surpassing brilliant magnetic core mutual-inductor and glue the function.

Drawings

FIG. 1 is a schematic perspective view of a connection structure of a transformer and a terminal button according to the present invention;

FIG. 2 is a schematic perspective view of the transformer of the present invention;

FIG. 3 is an exploded view of a partial perspective view of the instrument transformer of the present invention;

FIG. 4 is an exploded view of the hard material portion and the soft material portion according to the first and third embodiments of the present invention;

FIG. 5 is a schematic structural view illustrating a hard material portion and a soft material portion being ultrasonically riveted according to a first embodiment of the present invention;

FIG. 6 is a front view of the first embodiment of the present invention after the hard material portion and the soft material portion are ultrasonically riveted;

FIG. 7 is a side cross-sectional view of the first embodiment of the present invention after the hard material portion and the soft material portion are ultrasonically riveted;

FIG. 8 is a schematic structural diagram of a flexible material portion according to a second embodiment of the present invention;

FIG. 9 is a perspective view of a hard material portion and a soft material portion integrally injection molded according to a second embodiment of the present invention;

FIG. 10 is a side cross-sectional view of the hard material portion and the soft material portion integrally injection molded according to the second embodiment of the present invention;

FIG. 11 is a side cross-sectional view of a hard material portion and a soft material portion before being inserted and fixed according to a third embodiment of the present invention;

FIG. 12 is a side cross-sectional view of the hard material portion and the soft material portion after being fixed together by insertion according to the third embodiment of the present invention;

FIG. 13 is a perspective view of a hard material portion and a soft material portion of a third embodiment of the present invention after being fixed by insertion;

FIG. 14 is an exploded view of the internal core of the transformer of the present invention;

FIG. 15 is a schematic view of a power meter frame of the present invention.

Reference numerals:

connection structure 100 of mutual inductor and connection terminal

Mutual inductor 1 mutual inductor shell 10

Annular bottom wall 102 of annular housing cavity 101

Bottom 103 encapsulating material 104

Bottom end wall 111 of hard material part 11

A hole 113 in the outer sidewall 112

Small cylinder 114 cap 115

Base plate 121 of soft material part 12

Inner sidewall 122 perforations 123

Flexible interference portion 124 aperture 125

Magnetic core 13 magnetic core housing 132

Secondary current line 14 of ultracrystalline magnetic core 133

Lead-out wire 15 primary current wire 2

Body 31 of terminal pin 3

Post 32 of wiring hole 311

Connection hole 321 electric power meter 4

Metering device 42 of electric power meter shell 41

Terminal box 44 of 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.

Referring to fig. 1 to 13, a transformer 1 is configured to be sleeved on a primary current line 2, so that the transformer 1 can be used to perform isolated detection on power data on the primary current line 2. The mutual inductor 1 comprises a mutual inductor shell 10, an annular magnetic core 13 accommodated in the mutual inductor shell 10 and a secondary current wire 14 accommodated in the mutual inductor shell 10 and wound on the annular magnetic core 13, wherein each annular shape is not specially referred to as a circular ring, but the shape of the middle part of the circular ring, which is provided with a hole for the primary current wire 2 to pass through, is included in the coverage range of the annular shape, and the inner periphery and the outer periphery of the annular shape are not limited to be circular, and can be in any shape. The ring-shaped magnetic core 13 includes a magnetic core housing 132 and an ultra-crystalline magnetic core 133 accommodated in the magnetic core housing 132, in the specific embodiment shown in fig. 14, the ultra-crystalline magnetic core 133 is a ring shape made by winding a thin strip of amorphous material in a circle and then performing a heat treatment, and has excellent magnetic indexes, such as high magnetic permeability, high saturation magnetic induction, low loss, and the like, but since an amorphous strip starts to become brittle due to reasons such as structure relaxation during a heat treatment, the toughness is poor, and similar to metallic glass, when an external force is applied, the ultra-crystalline magnetic core 133 is easily broken, and the soft magnetic performance is reduced, so that the precision of the transformer 1 is poor due to serious damage, and the electric meter metering is inaccurate. The ultra-crystalline magnetic core 133 may be fixed in the magnetic core housing 132 by using materials such as soft glue or sponge, the magnetic core housing 132 is a ring shape for matching the shape of the ultra-crystalline magnetic core 133, the coil of the secondary current line 14 is wound on the magnetic core housing 132, the coil of the secondary current line 14 may be electrically connected to a pair of outgoing lines 15, and the outgoing lines 15 extend out of the transformer housing 10 to be electrically connected to the metering device 42 outside the transformer 1. Although the ultra-crystalline magnetic core 133 is protected by the core case 132, the ultra-crystalline magnetic core 133 in the transformer 1 is easily damaged during transportation, vibration, distortion, deformation, pressing, and the like.

Referring to fig. 2 and 3, the transformer case 10 of the present invention includes a rigid material portion 11 and a soft material portion 12 integrally formed, and the soft material is a material having certain softness and elasticity. The rigid material portion 11 and the soft material portion 12 together form an annular receiving cavity 101 with a closed bottom 103, the annular receiving cavity 101 includes an annular bottom wall 102, an outer sidewall 112 surrounding the outer side of the annular bottom wall 102, and an inner sidewall 122 surrounding the middle portion of the annular bottom wall 102, the annular magnetic core 13 is close to the annular bottom wall 102, and is sleeved outside the inner side wall 122 and is accommodated inside the outer side wall 112, the annular accommodating cavity 101 is filled with a packaging material 104 for fixing the annular magnetic core 13, the outer sidewall 112 is a part of the hard material portion 11, the inner sidewall 122 is a part of the soft material portion 12, a through hole 123 is formed inside the inner sidewall 122 for the primary current line 2 to pass through, the inner sidewall 122 protrudes into the through hole 123 to form a soft interference portion 124 for abutting and interfering the primary current line 2, and the soft material portion 12 is made of a high temperature resistant material. In this way, the rigid material portion 11 can achieve better structural stability and shape consistency for the transformer enclosure 10, and in different embodiments, the rigid material portion 11 may be made of ABS, PVC, or PC material. The flexible inner side wall 122 and the flexible interference portion 124 can realize smooth passing of the primary current line 2, and realize anti-vibration buffer matching between the mutual inductor 1 and the primary current line 2, so as to realize anti-vibration protection of the ultra-microcrystalline magnetic core 133 inside the mutual inductor 1, and avoid the influence of fragmentation of the ultra-microcrystalline magnetic core 133 and the primary current line 2 caused by vibration due to collision of various reasons on metering accuracy; the rigid material and the soft material are integrally combined together, so that the annular accommodating cavity 101 has a closed bottom 103, after the annular accommodating cavity 101 is filled with the packaging material 104, the bottom 103 has excellent tightness, and generally, the packaging material 104 can adopt epoxy resin glue or other packaging materials. In the field, because the primary current line 2 inside the transformer 1 needs to flow a large current for a long time and is easy to generate a large amount of heat, the transformer 1 needs to be usually in a high-temperature environment, if the bottom 103 of the annular accommodating cavity 101 has a gap, the packaging material 104 is easy to flow out of the transformer shell 10 through the gap after being heated, and once such glue leakage occurs, the metering accuracy is affected slightly, and a fire and other huge electric power safety accidents easily occur. Rubber or silica gel can be selected as the high-temperature-resistant material, so that even if the primary current wire 2 circulates large current for a long time, the soft inner side wall 122 and the soft interference portion 124 cannot be hot-melt damaged, and the use safety of the mutual inductor 1 is improved. In addition, the soft interference portion 124 may be a straight tooth shape or other protruding shapes, and has certain softness and elasticity.

Specifically, when the rigid-flexible transformer case 10 is decomposed from the rigid-flexible material, the rigid material portion 11 includes an annular bottom end wall 111 extending from the outer side wall 112 toward the through hole 123, the annular bottom end wall 111 is provided with a middle hole 113 corresponding to the through hole 123 for passing the primary current line 2, the flexible material portion 12 includes an annular bottom plate 121 extending from the inner side wall 122 toward the outer side wall 112, and the bottom end wall 111 and the bottom plate 121 are integrally provided with each other to form the annular bottom wall 102. In other words, in the present invention, the bottom wall 111 and the bottom plate 121 are combined by soft and hard materials, so that no gap is formed between the bottom wall 111 and the bottom plate 121, and when the encapsulating material 104 is heated, no glue leaks outwards.

Specifically, referring to fig. 4 and fig. 10 to 13, a schematic view of the bottom wall 111 and the bottom plate 121 integrally arranged together according to the first and third embodiments of the present invention is shown, wherein a plurality of small columns 114 surrounding and distributed outside the middle hole 113 are arranged on the bottom wall 111, a plurality of hole portions 125 surrounding and distributed outside the inner side wall 122 are arranged on the annular bottom plate 121 in a penetrating manner, and the hole portions 125 are fixed on the small columns 114 in a penetrating manner. With such an arrangement, after the hole portions 125 and the small pillars 114 are inserted one by one, the bottom end wall 111 and the bottom plate 121 are integrally arranged with each other before packaging, and the bottom end wall 111 and the bottom plate 121 are tightly fixed without the possibility of generating a gap due to mutual transverse displacement or lateral separation, so that after packaging, the packaging material 104 does not leak glue through the possible gap even when heated. Thus, the vibration-proof and glue leakage-proof functions of the ultracrystalline magnetic core 133 mutual inductor 1 are realized.

In order to manufacture the transformer 1 of the above embodiment, the present invention provides a package manufacturing method of the transformer 1, the package manufacturing method of the transformer 1 including:

the hard material portion 11, the soft material portion 12, and the annular core 13 wound with the coil of the secondary current wire 14, as shown in fig. 4, are respectively manufactured, and the above steps are not divided into front and rear steps. Referring to fig. 14, the ring-shaped magnetic core 13 includes a magnetic core housing 132 and an ultra-crystalline magnetic core 133 accommodated in the magnetic core housing 132. Referring to fig. 4, the hard material portion 11 includes a bottom end wall 111 having a central hole 113 and an outer side wall 112 surrounding the bottom end wall 111, and the bottom end wall 111 is provided with a plurality of small columns 114 surrounding the central hole 113; the flexible material portion 12 includes a cylindrical hollow inner side wall 122 and a ring-shaped bottom plate 121 extending outward from the inner side wall 122, a through hole 123 is formed inside the inner side wall 122 for the primary current line 2 to pass through, the inner side wall 122 protrudes into the through hole 123 to support a flexible interference portion 124 interfering with the primary current line 2, the flexible material portion 12 is made of a high temperature resistant material, and a hole portion 125 surrounding and distributed outside the inner side wall 122 is formed in the ring-shaped bottom plate 121 in a penetrating manner;

then, closely attaching the annular base plate 121 to the bottom end wall 111, and fixing the hole 125 on the small column 114 to form an annular accommodating cavity 101 with a sealed bottom 103;

the annular magnetic core 13 wound with the secondary current wire 14 coil is assembled in the annular accommodating cavity 101;

the annular housing chamber 101 is filled with a sealing material 104 to complete the sealing.

Thus, the annular base plate 121 and the bottom end wall 111 can be fixed and attached seamlessly, after the annular magnetic core 13 is installed and packaged, the packaging material 104 cannot overflow the outside of the transformer casing 10 through a possible gap between the annular base plate 121 and the bottom end wall 111 after being heated for a long time, the transformer casing 10 integrated with the soft and hard bodies can effectively protect the outside of the transformer 1, and the transformer 1 with the ultra-crystalline magnetic core 133 has excellent vibration-proof and glue-leakage-proof functions.

Further, please refer to fig. 5 to 7, which are schematic structural diagrams of the transformer enclosure 10 after the ultrasonic riveting process is performed according to the first embodiment of the present invention. After the hard material portion 11 and the soft material portion 12 are positioned and combined, the small column 114 is riveted by ultrasonic waves, and a cap portion 115 which is arranged on the chassis 121 to cover the chassis 121 and prevent the chassis 121 from being separated from the small column 114 is integrally extended from the top of the small column 114. So configured, the cap portion 115 extending integrally with the bottom end wall 111 provides a very secure, seamless fit of the tray 121 to the bottom end wall 111. The cap 115 may further press the bottom chassis 121 downward from the periphery of the small cylinder 114, and compared with the third embodiment, the riveting process of the first embodiment may enable the hard material portion 11 and the soft material portion 12 to be more tightly combined, and may further ensure the seamless connection between the hard material portion 11 and the soft material portion 12, so as to avoid glue leakage at the bottom 103 of the transformer housing 10.

Specifically, the riveting process is a process of manufacturing the transformer 1, further including the steps of fixing the hole 125 to the small column 114, and then ultrasonically riveting the small column 114 to form a flat cap 115 extending integrally on the top of the small column 114, and riveting the chassis 121 with the small column 114 passing through the hole 125. Because the soft material is a high-temperature resistant material, when the small column 114 is subjected to ultrasonic welding, the soft material can be prevented from being damaged greatly, the structure is stable after riveting, and the bottom 103 of the transformer shell 10 is excellent in tightness.

More preferably, referring to fig. 8 to 10, which are schematic structural views of a transformer enclosure 10 according to a second embodiment of the present invention, the annular bottom plate 121 is embedded and formed inside the bottom end wall 111. With this arrangement, the soft material portion 12 and the hard material portion 11 can have a complete sealing property of the bottom portion 103 during the manufacturing and molding process, thereby achieving an optimal glue leakage prevention function.

With regard to the method of manufacturing the transformer 1 of the second embodiment, the specific steps include:

manufacturing a ring-shaped magnetic core 13 wound with a coil of a secondary current wire 14, wherein the ring-shaped magnetic core 13 comprises a magnetic core shell 132 and an ultracrystalline magnetic core 133 accommodated in the magnetic core shell 132;

the mutual inductor shell 10 with two different soft and hard materials is formed in one step by a bicolor plastic injection machine, the mutual inductor shell 10 comprises a hard material part 11 and a soft material part 12, the soft material part 12 comprises a columnar hollow inner side wall 122 and a ring-shaped bottom disc 121 extending outwards from the inner side wall 122, a through hole 123 is formed inside the inner side wall 122 for a primary current wire 2 to pass through, the inner side wall 122 protrudes inwards the through hole 123 to support a soft interference part 124 interfering the primary current wire 2, the soft material part 12 is a high temperature resistant material, the hard material part 11 comprises a bottom end wall 111 with a middle hole 113 and an outer side wall 112 surrounding the outer side of the bottom end wall 111, the bottom disc 121 is embedded in the bottom end wall 111 in an injection molding mode, and the inner side wall 122, the outer side wall 112, the bottom disc 121 and the bottom end wall 111 form a ring-shaped containing cavity 101 with a;

So set up, double-colored plastic injection machine one shot forming has the mutual-inductor shell 10 of two kinds of different soft and hard materials, can make mutual-inductor shell 10 both includes hard material portion 11 and includes soft material portion 12, so has splendid anti vibration performance, and makes cyclic annular accommodation chamber 101 have the best bottom 103 seal nature, even have very big hourglass gluey pressure after mutual-inductor 1 is inside to be heated, still can guarantee that packaging material 104 can not follow and outwards reveal between hard material portion 11 and soft material portion 12, has avoided the possibility of measuring error that here hourglass gluey caused even electric power accident completely. It should be noted that the "two-color plastic injection machine" refers to a device capable of performing integrated injection molding of the transformer housing 10 by two or more materials at the same time or in front and at the back, and the device may be formed by one complete device or by combining or matching a plurality of devices. Specifically, the hard material portion 11 and the soft material portion 12 may be simultaneously injection molded together; or as shown in fig. 8, the soft material portion 12 is first injection molded, and then the hard material portion 11 is injection molded outside the soft material portion 12, for example, a rubber piece or a silicone piece is placed in an injection mold for injection molding; or the hard material part 11 is firstly and partially injected, then the soft material part 12 is injected, and then the rest part of the hard material part 11 is injected.

As a further optimization, in the second embodiment shown in fig. 8, holes 125 are formed in the annular bottom plate 121 and distributed around the outer side of the inner wall 122, and the holes 125 are embedded in the bottom end wall 111. With this arrangement, the hard material portion 11 can flow into the hole 125 during injection molding, and after injection molding is completed, the embedding density between the soft material and the peripheral hard material can be increased, so that delamination between the materials is less likely to occur. Of course, in other embodiments of the present invention similar to the second embodiment, the soft material portion 12 may not be provided with the hole 125, or the bottom plate 121 having other shapes may be used for injection molding.

Referring to fig. 15 and fig. 1, the present invention further provides an electric power meter 4, wherein the electric power meter 4 is used for sampling, measuring and measuring an electric parameter in an isolated manner. Electric power instrument 4 includes electric power instrument shell 41, is located metering device 42, measurement display device 43 and the terminal box 44 of working a telephone switchboard of electric power instrument shell 41, be equipped with mutual-inductor 1 and terminal box 3's connection structure 100 in the terminal box 44 of working a telephone switchboard, mutual-inductor 1 includes with terminal box 3's connection structure 100 mutual-inductor 1, wear to establish mutual-inductor 1 last current line 2 and electric connection in terminal box 3 on the current line 2 of working a telephone switchboard, terminal box 3 includes main part 31 and the columnar body 32 that extends forward from main part 31, columnar body 32 is sunken to have connecting hole 321 from the front to the back, main part 31 is equipped with from the wiring hole 311 sunken to the back, connecting hole 321 and wiring hole 311 back and forth back mutually and do not communicate, primary current line 2 wears to locate in the connecting hole 321. Thus, the electric power instrument 4 is provided with the mutual inductor 1 with the ultracrystalline magnetic core 133, and the mutual inductor 1 has vibration-proof and glue leakage-proof performances, so that the stable metering result and the electricity utilization use safety of the electric power instrument 4 are greatly provided.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The utility model provides a mutual inductor for the cover is located on the primary current line, the mutual inductor includes the mutual inductor shell, accept in the mutual inductor shell cyclic annular magnetic core, accept in the mutual inductor shell and twine in secondary current line on the cyclic annular magnetic core, its characterized in that: the annular magnetic core comprises a magnetic core shell and an ultracrystalline magnetic core accommodated in the magnetic core shell, the mutual inductor shell comprises a rigid material part and a soft material part which are integrally arranged, the rigid material part and the soft material part jointly form an annular accommodating cavity with a closed bottom, the annular accommodating cavity comprises an annular bottom wall, an outer side wall surrounding the outer side of the annular bottom wall and an inner side wall surrounding the middle part of the annular bottom wall, the annular magnetic core is attached to the annular bottom wall, is sleeved on the outer side wall and is accommodated on the inner side wall, the outer side wall is a part of the rigid material part, the inner side wall is a part of the soft material part, a perforation is formed on the inner side of the inner side wall for the primary current wire to pass through, a soft interference part for supporting and interfering the primary current wire is stretched in the perforation, and the soft material part is made of a high-temperature resistant material, the annular accommodating cavity is filled with an encapsulation material for fixing the annular magnetic core.

2. The instrument transformer of claim 1, wherein: the hard material part comprises an annular bottom end wall extending from the outer side wall to the perforation direction, the bottom end wall is annular, a middle hole which corresponds to the perforation and is used for a primary current line to pass through is formed in the bottom end wall, the soft material part comprises an annular base plate extending from the inner side wall to the outer side wall, and the bottom end wall and the base plate are mutually integrated to form an annular bottom wall.

3. The instrument transformer of claim 2, wherein: the bottom end wall is provided with a plurality of small columns surrounding and distributed on the outer side of the middle hole, the annular chassis is provided with a plurality of hole parts surrounding and distributed on the outer side of the inner side wall in a penetrating way, and the hole parts are fixed on the small columns in a penetrating way.

4. The instrument transformer of claim 3, wherein: the top of the small column body is integrally extended with a cap part which is used for covering the chassis and preventing the chassis from being separated from the small column body.

5. The instrument transformer of claim 2, wherein: the annular base plate is embedded and formed inside the bottom end wall.

6. The instrument transformer of claim 5, wherein: the annular chassis is provided with hole parts which are arranged outside the inner side wall in a surrounding mode in a penetrating mode, and the hole parts are embedded in the bottom end wall.

7. The utility model provides an electric power instrument, includes electric power instrument shell, is located metering device, measurement display device and mutual-inductor and the connection structure of wiring terminal button in electric power instrument shell, its characterized in that: the connection structure of the mutual inductor and the connection terminal comprises the mutual inductor, a primary current line penetrating through the mutual inductor and a connection terminal electrically connected to the primary current line, wherein the connection terminal comprises a main body part and a columnar body extending forwards from the main body part, the columnar body is recessed from front to back and provided with a connection hole recessed from back to front, the connection hole and the connection hole are back to back and are not communicated with each other, and the primary current line penetrates through the connection hole.

8. A packaging manufacturing method of a mutual inductor is characterized in that: the transformer according to any one of claims 1 to 4, wherein the transformer is manufactured by a packaging method comprising:

9. The method for manufacturing a package for a transformer according to claim 8, wherein: the method for manufacturing the mutual inductor package further comprises the steps of after the hole part is fixedly penetrated on the small column body, carrying out ultrasonic riveting on the small column body, enabling the top of the small column body to be provided with an integrally extending flat cap part, and enabling the small column body to penetrate through the hole part and then riveting the chassis.

10. A packaging manufacturing method of a mutual inductor is characterized in that: the transformer according to any one of claims 1, 5 and 6, wherein the packaging manufacturing method of the transformer comprises the following steps: