CN204424061U - Enhancement mode intrinsic safety transformer - Google Patents
Enhancement mode intrinsic safety transformer Download PDFInfo
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- CN204424061U CN204424061U CN201520095785.5U CN201520095785U CN204424061U CN 204424061 U CN204424061 U CN 204424061U CN 201520095785 U CN201520095785 U CN 201520095785U CN 204424061 U CN204424061 U CN 204424061U
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Abstract
The utility model discloses a kind of enhancement mode intrinsic safety transformer, comprise coil, skeleton and magnetic core, the outer surface of skeleton has winding slot, and its inside has through channel, and core portion is placed in passage; Between adjacent winding slot, there is separation trough, and outside skeleton, be arranged with the first guard shield, first guard shield has the rectangular chamber holding skeleton, the bottom of this chamber has the opening for loading skeleton, the sidewall of this chamber has the through hole be connected with skeleton passage, the both sides of the first guard shield have flange, and flange and chamber outer wall form the groove of holding portion magnetic core, and magnetic core outside is also arranged with the second guard shield.The utility model has the advantages such as reliability is high, production cost is low, compact conformation.
Description
Technical field
The present invention relates to a kind of transformer of special purpose, be specifically related to a kind of enhancement mode intrinsic safety transformer of middle low power.
Background technology
Essential safe type isolating transformer is called for short intrinsic safety type transformer.GB3836.4 " Electric Equipment in Explosive Gas Atmosphere the 4th part: essential safe type " and IEC60079-0: in " explosive gas atmosphere electric equipment the 0th part: General Requirement ", clear and definite regulation has been carried out to its indices.Essential safe type " i " intrinsic safety is a kind of type of explosion proof construc tion of electric equipment, and device interior and the issuable electric spark of connection wire and thermal effect energy limited being exposed to potential explosive Hua Jing can not produced the level of lighting by it.The circuit of intrinsic safety type transformer is under the normal fault condition worked and specify, any electric spark of generation or any thermal effect all can not light the explosive gas atmosphere of regulation.
Traditional intrinsic safety transformer has following several mode:
1. flat surface transformer type intrinsic safety transformer
Its magnetic core and winding are planar structure, have the feature of high frequency, low moulding.
Flat surface transformer, by the difference designing and producing technique, can be divided into printed circuit (PCB) type, thick-film type, film-type, submicron 4 kinds.The electromagnetic oven of every day use is also a kind of special applications of flat surface transformer, and the electromagnetic disc of stove is the elementary of transformer, and the bottom of a pan is that transformer secondary output is held concurrently load.
Printed circuit PCB type transformer as shown in Figure 1, is formed with single or multiple lift pcb board and magnetic core, therefore also referred to as flat-plate transformer.As shown in Figure 1, in this transformer, the Copper Foil be printed on pcb board instead of enamelled wire in common transformer.And being furnished with FERRITE CORE in the both sides of pcb board, the primary and secondary of transformer is separated by the substrate of PCB, and the material of substrate adopts the insulating material such as epoxy resin base plate or paper base plate usually.
GB3836.4-2010 table 5 the 4th row require intrinsic safety type transformer solid insulation spacing >=1.0mm; Flat-plate transformer just, secondary between can be separated by the substrate that 1mm is thick, to meet the requirement of the safe spacing between intrinsic safety and non-intrinsic safety, also meeting dielectric voltage withstand must ask simultaneously.
Its major defect is as follows:
A, window utilance are low, are only 0.25 ~ 0.3, and the window utilance of traditional transformer is 0.4, and its volume is also larger.
B, pcb Copper Foil and spacing width are all smaller, and Copper Foil is easily opened a way, easily short circuit between Copper Foil, and therefore transformer fraction defective is higher.
The number of turn of C, coil is more, and the number of plies of PCB is more.Along with the number of plies of PCB increases, PCB cost sharply increases.For reducing cost, need improve the frequency of transformer, high-frequency magnetic core and drive circuit are not all conventional devices, just cause transformer and complete machine cost greatly to increase yet.
D, winding limited amount, for the occasion that multivoltage exports, be applicable to hardly.
E, can not device be put when intrinsic safety applications around magnetic core, account for board area large.
Dielectric voltage withstand between F, primary and secondary, between primary and secondary and magnetic core places one's entire reliance upon the production technology of PCB producer and material horizontal, and between each batch, quality is also not quite similar, and makes this type of intrinsic safety transformer safety performance usually be in dangerous edge, dangerous.
2. pour type intrinsic safety transformer
As shown in Figure 2, same magnetic core covers the first insulation processing layer, coiling first winding on it, pours the second insulation processing layer outside the first winding, and on the second insulation processing layer, coiling second winding, finally encapsulates with shell.Utilize encapsulation compound to achieve the isolation of electric original paper and external environment condition, arrange the spacing >=2.0mm of regulation by encapsulation compound at GB3836.4-2010 table 5 the 3rd, and around coil, rubber seal height is not less than 1.0mm.
Its major defect is as follows:
Often there is bubble in A, encapsulating process, after having bubble, just can not meet intrinsic safety requirement, cause manufacturing Times rate higher;
B, for meeting the encapsulating requirement of GB3836.4, the size of transformer can become larger.
C, because its length, width and height size is all comparatively large, be unfavorable for the Miniaturization Design of intrinsic safety electric equipment.
3. solid insulation type intrinsic safety transformer
Belong to the intrinsic safety transformer that primary and secondary solid insulation spacing is greater than 1mm.
Through retrieval, Chinese patent literature CN1770334A discloses a kind of transformer with safety creepage distance, lining is set between the iron core and coil brace of transformer, meets requirement that is miniaturized and safety creepage distance by the turnup structure of lining simultaneously.But this structure is not designed by intrinsic safety transformer, does not possess the function of encapsulated coil, cannot be applied directly on intrinsic safety transformer.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides that a kind of reliability is high, production cost is low, the enhancement mode intrinsic safety transformer of compact conformation.
Technical scheme: for solving the problems of the technologies described above, enhancement mode intrinsic safety transformer provided by the invention, comprise coil, skeleton and magnetic core, the outer surface of described skeleton has winding slot, and the inside of described skeleton has through channel, and described core portion is placed in passage; Between adjacent winding slot, there is separation trough, the first guard shield is arranged with outside described skeleton, described first guard shield has the rectangular chamber holding skeleton, the bottom of described chamber has the opening for loading skeleton, the sidewall of described chamber has the through hole be connected with skeleton passage, the both sides of described first guard shield have flange, and described flange and chamber outer wall form the groove of holding portion magnetic core, and described magnetic core outer cover is provided with the second guard shield.
As preferably, described magnetic core E shape magnetic core, comprise two side columns and a newel, described newel is placed in passage, is arranged with the second guard shield outside described lateral column.
The c-shaped cell body of described second guard shield, described C shape cell body comprises pair of parallel extension and the connecting portion being connected extension, and described extending area is in groove, and described connecting portion is outside groove.
As preferably, described magnetic core is EPC magnetic core or EPD magnetic core.
As preferably, described magnetic core is the first symmetrical magnetic core and the second magnetic core.Also asymmetric magnetic core can be adopted.
As preferably, described first guard shield is provided with the base plate covering described opening.
The end of described skeleton both sides winding slot is to having lead-in wire, and described lead-in wire is drawn between base plate and the first guard shield.
As preferably, described first guard shield, skeleton, the second guard shield and cover plate are made by flame-resistant insulation plastics.
The enhancement mode intrinsic safety transformer of said structure, can complete assembling by following steps:
1) coiling on skeleton;
2) skeleton is loaded in the rectangular chamber of the first guard shield;
3) the second guard shield is placed on outside E shape magnetic core;
4) intermediolateral column of E shape magnetic core is penetrated skeleton passage from the through hole of the first guard shield, make two side columns be placed in the groove of the first guard shield simultaneously.
5) cover plate is installed.
When needing to manufacture the non-enhancement mode intrinsic safety transformer poured, take following technological measure:
1) take separation trough as segmentation, intrinsic safety end and non-intrinsic safety end lay respectively at the both sides of separation trough.
2) secondary vacuum pumping varnished insulation paint process after transformer processing.Namely coating process mode is adopted.
3) transformer is soldered to secondary spray insulating varnish process after on pcb board.Namely coating process mode is adopted.
When needing to manufacture the enhancement mode intrinsic safety transformer poured, technological measure is as follows:
1) with the dielectric separation plate of 1mm for segmentation, intrinsic safety end and non-intrinsic safety end distinguish both sides, position.
2) coiling is apart from dielectric separation plate top 1mm
3) after transformer processing, secondary first soaks insulating varnish process.Adopt coating process mode.
4) fill with insulating cement, vacuumizing lower solidification, adopt vacuum glue pouring curing process.
5) transformer is soldered to secondary spray insulating varnish process after on pcb board.Adopt coating process mode.
Beneficial effect: enhancement mode intrinsic safety transformer of the present invention, by adopting the composite construction of the first guard shield and the second guard shield, has following significant progress:
1) the transformer insulated intensity of this enhancement mode intrinsic safety increases, and electric property significantly promotes, the radical change of essential safety Key Circuit, and reliability is guaranteed;
2) production technology is simple, and productive rate, quality, reliability all improve a lot, and the cost of raw material and complete machine cost significantly reduce.Also organically combine with conventional process techniques simultaneously.
3) product structure rationally, volume reduces more than 40%, and the design for the confined space reserves valuable size.
When encapsulating does not use, intrinsic safety, non-intrinsic safety coil are distributed in middle separation trough both sides, simultaneously by coating process process, meet the requirement of the creepage distance >=3.3mm under GB3836.4-2010 table 5 the 6th row coating completely.
When encapsulating, intrinsic safety, non-intrinsic safety coil are distributed in the wide insulation of middle 1.0mm every demarcation strip both sides, simultaneously by process for filling colloid into process, meet GB3836.4-2010 table 5 the 3rd completely and arrange the spacing >=2.0mm of regulation by rubber seal compound, and around coil, rubber seal height is not less than the requirement of 1.0mm.
Except technical problem, the technical characteristic forming technical scheme and the advantage brought by the technical characteristic of these technical schemes that the present invention recited above solves, the advantage that the other technologies feature comprised in the other technologies problem that enhancement mode intrinsic safety transformer of the present invention can solve, technical scheme and these technical characteristics bring, will be described in more detail by reference to the accompanying drawings.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing printed circuit type transformer;
Fig. 2 is the existing structural representation pouring type intrinsic safety transformer;
Fig. 3 is the structural representation of the embodiment of the present invention;
Fig. 4 is the installation diagram of Fig. 3;
Fig. 5 is the structural representation of winding in Fig. 3;
Fig. 6 is the winding circuit figure of Fig. 4.
Embodiment
Embodiment: the structure of the enhancement mode intrinsic safety transformer of the present embodiment as shown in Figure 3 and Figure 4, comprises the first guard shield 1, and material is flame-resistant insulation plastics, as PPD+ fiber+fire-retardant.Skeleton 2, material is flame-resistant insulation plastics, as PM920.Magnetic core 3, selects the thin type magnetic cores such as existing EPC or EPD.Second guard shield 4, material is flame-resistant insulation plastics, its wall thickness >=1.0mm.Cover plate 5, material is flame-resistant insulation plastics.Above-mentioned flame-resistant insulation plastic components can adopt existing Shooting Technique to make.
First guard shield 1 has the rectangular chamber for holding skeleton 2, and for holding the groove of magnetic core 3 post portion, because rectangular chamber is contrary with the opening direction of groove, only needs a set of simple mould just can injection mo(u)lding during manufacture.
The outer surface of skeleton 2 has the first winding slot 6, its lead-in wire is exported by pin 1 ~ N1; Separation trough 7, it is the dielectric separation plate of 1mm, and another side is the separation dielectric separation plate of more than 0.5mm, the spacing >=1.0mm of two dielectric separation plates; Second winding slot 9, going between is exported by pin N2 ~ Nn.
Magnetic core 3 is separated by the first guard shield 1 with the coil windings (not shown) on skeleton 2, makes accumulative solid insulation size between magnetic core 3 and coil be greater than 1mm.
GB3836.4-2010 requires between intrinsic safety and non-intrinsic safety winding or under being greater than coating, creepage distance is all greater than 3.3mm; Be greater than the spacing 2.0mm distance of rubber seal compound, and around coil, rubber seal height is not less than the requirement of 1.0mm.Creepage distance refers to the beeline along insulating material and air contacting surface between two conductive components.
First guard shield 1 and the second guard shield 4 will separate accumulative at least 3.3mm spacing around magnetic core 2 and other electric conductor or transformer in the present embodiment, under making to meet coating around magnetic core 2 and other electric conductor or transformer, creepage distance is all greater than 3.3mm, meets above-mentioned requirements.
The pin of intrinsic safety end and non-intrinsic safety end is arranged in corresponding winding side respectively.The spacing of the pin between the different windings of the same side can make different size according to different insulative is withstand voltage, to meet withstand voltage insulating requirements, simultaneously can according to winding number the pin of respective numbers is set.
As shown in Figure 5 and Figure 6, winding N1, N2, N3, N4, N5, N6 are around in the first winding slot 6, and winding N7, N8, around in the second winding slot 8, are separated by insulating material 9 between winding, are separated between two winding slots by separation trough 7.The separation trough of actual product and divider wall can be not limited to several, winding method also can adopt groove around or flat around.
The invention solves the deficiency existing for existing intrinsic safety transformer, technique is simple, and production efficiency is high, and rate of finished products is high, and without hidden danger of quality, cost is low, and size is little, does not have high request to frequency and core material, drive circuit, and exportable more organize voltage.
Below by reference to the accompanying drawings embodiments of the present invention are described in detail, but the present invention is not limited to described execution mode.For those of ordinary skill in the art, in the scope of principle of the present invention and technological thought, execution mode is carried out to these execution modes and carries out multiple change, amendment, replacement and distortion and still fall within the scope of protection of the present invention.
Claims (6)
1. an enhancement mode intrinsic safety transformer, comprise coil, skeleton and magnetic core, the outer surface of described skeleton has winding slot, the inside of described skeleton has through channel, described core portion is placed in passage, it is characterized in that: between adjacent winding slot, there is separation trough, the first guard shield is arranged with outside described skeleton, described first guard shield has the rectangular chamber holding skeleton, the bottom of described chamber has the opening for loading skeleton, the sidewall of described chamber has the through hole be connected with skeleton passage, the both sides of described first guard shield have flange, described flange and chamber outer wall form the groove of holding portion magnetic core, described magnetic core outer cover is provided with the second guard shield.
2. enhancement mode intrinsic safety transformer according to claim 1, it is characterized in that: described magnetic core E shape magnetic core is the one in EI, EFD or EE type magnetic core, comprise two side columns and a newel, described newel is placed in passage, is arranged with the second guard shield outside described lateral column.
3. enhancement mode intrinsic safety transformer according to claim 1, it is characterized in that: the c-shaped cell body of described second guard shield, described C shape cell body comprises pair of parallel extension and the connecting portion being connected extension, and described extending area is in groove, and described connecting portion is outside groove.
4. enhancement mode intrinsic safety transformer according to claim 1, is characterized in that: described first guard shield is provided with the base plate covering described opening, the end of described skeleton both sides winding slot is to having lead-in wire, and described lead-in wire is drawn between base plate and the first guard shield.
5. enhancement mode intrinsic safety transformer according to claim 2, is characterized in that: described magnetic core is the first symmetrical magnetic core and the second magnetic core.
6. enhancement mode intrinsic safety transformer according to claim 2, is characterized in that: described magnetic core is EPC magnetic core or EPD magnetic core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520095785.5U CN204424061U (en) | 2015-02-11 | 2015-02-11 | Enhancement mode intrinsic safety transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520095785.5U CN204424061U (en) | 2015-02-11 | 2015-02-11 | Enhancement mode intrinsic safety transformer |
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| Publication Number | Publication Date |
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| CN204424061U true CN204424061U (en) | 2015-06-24 |
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| CN201520095785.5U Active CN204424061U (en) | 2015-02-11 | 2015-02-11 | Enhancement mode intrinsic safety transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104616869A (en) * | 2015-02-11 | 2015-05-13 | 南京优倍电气有限公司 | Enhancement intrinsic safety transformer |
| CN107424791A (en) * | 2017-06-29 | 2017-12-01 | 苏州品翔电通有限公司 | A kind of transformer framework and preparation method thereof |
-
2015
- 2015-02-11 CN CN201520095785.5U patent/CN204424061U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104616869A (en) * | 2015-02-11 | 2015-05-13 | 南京优倍电气有限公司 | Enhancement intrinsic safety transformer |
| CN107424791A (en) * | 2017-06-29 | 2017-12-01 | 苏州品翔电通有限公司 | A kind of transformer framework and preparation method thereof |
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