CN110459392A - A kind of mold transformer - Google Patents

Abstract

The invention discloses a kind of molding transformer, including primary coil and secondary coil, the state that predetermined space is arranged inside primary coil is set, and mold transformer is by this way, primary and secondary coil is supported by multiple support constructions.Multiple support constructions are mounted between primary and secondary overhang, and each support construction is formed by collets and wide insulation board, and surface area is greater than lower surface area collets.The adjacent primary and secondary overhang of the top surface of collets, wide insulation board are located between the bottom surface and frame of collets.

Description

A kind of mold transformer

Technical field

The present invention relates to transformer technology field, specially a kind of mold transformer.

Background technique

It includes elastic rubber that resin molded cylindrical pressure winding (primary coil) and low pressure winding (secondary coil), which passes through, The insulation spacer of glue spacer portions and cured Compartmentalized resin part.Therefore, it discloses one kind and is configured as being fixed to and become The mold transformer of depressor frame.

In general, mold transformer is mounted in electric panel room and operates wherein, which is kept so that external empty Gas will not be directly entered.However, in recent years, it is expected that expanding the application range of mold transformer.Therefore, it is possible to be installed in With a large amount of dusts, moisture, in the particular surroundings of salt etc., there are no the installation positions for being regarded as mold transformer up to now It sets.Much less, it is necessary to ensure that with the comparable reliability of reliability in prepared environment so that even if in this environment Operation, outside air will not be directly entered.

There are a large amount of dusts, in the environment of moisture and salt, it is necessary to take into account the corrosion phenomenon as caused by tracking phenomenon.Especially Be, the rubber part of insulating spacer due to dust, the attachment of the impurity such as moisture and salt and cause corrosion resistance to deteriorate, and increase Electric field concentration is added.As a result, the corrosion progress and insulation resistance reduction of rubber part, so that tracking phenomenon may be with insulator Block carries out together, and insulation breakdown may occur.

In order to improve the insulating properties of transformer, it is ensured that the big creepage distance between coil and metal than the coil (along the distance on the surface for the insulating component being arranged between coil and metal than the coil).In oil-immersed transformer In, be arranged in coil and be arranged on coil periphery coil pressing metal fittings between insulating materials shape than coil axis Upward length is long, and discloses by making its prominent up and down rather than the two of coil endface position and ensure to climb The technology of row distance.

Summary of the invention

Mold transformer according to an embodiment of the present invention includes cylindrical primary coil, predetermined with the setting of primary coil inside The cylindrical secondary coil of the state setting in space, upper frame and lower frame.Primary coil and secondary coil are tied by multiple supports Structure support.Multiple support constructions are separately positioned between the top and bottom and frame of primary and secondary coil, and collets It is greater than the bottom section of collets with the area in wide region.It is made of insulation board.Insulator block and primary and secondary coil End contact, and wide insulation board is arranged between insulator block and frame.

For The effect of invention in accordance with the invention it is possible to extend the creepage distance of insulator block portion, that improves mold transformer can By property.

Detailed description of the invention

Fig. 1 is the front view according to the mold transformer of embodiment 1；

Fig. 2 is the side view according to the mold transformer of embodiment 1；

Fig. 3 is the cross-sectional view according to the support construction of the cross-sectional view and support transformer coil of the transformer coil of example 1；

Fig. 4 is the perspective view according to the support construction of embodiment 1；

Fig. 5 is the cross-sectional view of the support construction of the upper end according to first embodiment positioned at transformer coil；

Fig. 6 is the section view of the cross-sectional view of transformer coil according to the second embodiment and the support construction of support transformer coil Figure；

Fig. 7 is the perspective view according to the support construction of embodiment 2；

Fig. 8 is the view for showing the shape for working as the lower end time width insulation board that coil is arranged according to the support construction of the modification of example 2 Figure；

Fig. 9 be transformer coil according to the third embodiment cross-sectional view and support transformer coil support construction it is transversal Face figure；

Figure 10 is the perspective view according to the support construction of embodiment 3；

Figure 11 is the cross-sectional view when padded coaming is arranged in below wide insulation board；

Figure 12 is the sectional view according to the secondary coil of example 4；

Figure 13 is the cross according to the support construction of the cross-sectional view and support transformer coil of the transformer coil of the 5th embodiment Sectional view；

Figure 14 is the perspective view according to the support construction of embodiment 5；

Figure 15 is the structure chart according to the support construction of example 5；

Figure 16 is the structure chart according to the support construction of example 6.

In figure: 1 primary coil, 2 secondary coils, 3 resins, the padded coaming of 4 such as silicon rubber, 5 insulator blocks, 6 positions Retaining pin, 7 transformer accessories, 8(8a, 8b, 8c, 8d) width insulation board, 9 insulating papers, 10 insulating tapes, 11 spaces, 13 iron cores, 20 frames Frame.

Specific embodiment

First embodiment is described below with reference to the accompanying drawings.Fig. 1 is the forward sight of mold transformer 100 according to first embodiment Figure, Fig. 2 is the side view of mold transformer 100.

In mold transformer 100 according to first embodiment, cylindrical primary coil 1 and secondary coil 2(are for example, circle Cylindricality) it is supported by metal framework 20 via multiple collets 5 and metal fittings 7.Frame 20 includes being located at mold transformer 100 The frame 20a of lower part and frame 20b positioned at 100 top of mold transformer.Hereinafter, as reference frame 20a and frame 20b When without being distinguished from each other, they are referred to as " frame 20 ".In addition, in the present specification, collets 5, metal fittings 7 and frame 20 are referred to as supporting structure part.

Fig. 3 shows the branch of coil (primary coil 1, secondary coil 2) and the coil lower end in mold transformer 100 The cross section of support structure part.Fig. 4 is the perspective view of support construction.Primary coil 1 and secondary coil 2 are all moulded simultaneously with resin 3 And it is coaxially arranged in radial directions.In Fig. 3, left side corresponds to the center position of cylinder, and right side corresponds to the periphery of cylinder Direction.Primary coil 1 and secondary coil 2 all mould (referring to Fig. 3) with resin 3.Secondary coil 2 is coaxially disposed in primary coil In 1, and space 11(is provided referring to Fig. 3 between primary coil 1 and secondary coil 2).Iron core 13 is arranged in secondary coil 2 It is interior.In mold transformer according to first embodiment, primary coil 1 is high-tension coil, and secondary coil 2 is low-voltage coil.

Collets 5 have the first support section 5a for being used to support primary coil 1 and for supports time on the upper surface of which Second support section 5b of grade coil 2.Collets 5 are made of insulator such as glass laminate.In addition, in primary coil 1, it is secondary The padded coaming 4 of such as silicon rubber is inserted between coil 2 and collets 5.Multiple metal fittings 7 for fixing collets 5 are pacified On the frame 20a of mold transformer 100, collets 5 are arranged on the metal fittings 7 on transformer framework 20.In addition, being Prevent insulator block 5 from shifting, collets 5 and metal fittings 7 pass through the fixation of position retaining pin 6.

Fig. 3 be show it is according to first embodiment under the primary coil 1 and secondary coil 2 of mold transformer 100 The cross-sectional view of one of the support construction at end.The upper part of secondary coil 2 also has the structure with the almost symmetry in Fig. 2. Fig. 5 shows the support of the upper end of the primary coil 1 and secondary coil 2 positioned at mold transformer 100 according to first embodiment The cross-sectional view of structure division.In this case, collets 5 turn upside down use from direction shown in Fig. 2.That is, the One support section 5a is placed in contact the upper end of primary coil 1, and the second support section 5b is placed in contact the upper of secondary coil 2 End.Collets 5 positioned at the upper end of primary coil 1 and secondary coil 2 pass through the frame that bolt 15 is connected to metal fittings 7 and upside Frame 20b.

When present inventor carries out analysis of electric field based on analysis system shown in Fig. 3 and 4, discovery electric field is applied It is added to the corner of padded coaming 4.In the normal arrangement environment (environment of such as electric panel room, so that outside air of mold transformer The environment not directly entered) under, even if using the structure of traditional mold transformer, corrosion resistance will not be reduced.However, working as Mold transformer is mounted on a large amount of dusts, moisture, when in the particular surroundings of salt etc., due to being attached on silicon rubber part Dust, moisture, the influence of salt etc., electric field increase, and the resistance of the silastic surface due to caused by shelf depreciation increases.Corrosion It reduces.Then, the electric discharge corrosion generated in silicon rubber progresses into insulator block 5, causes dielectric breakdown.

Since the distance between the metal fittings 7 with primary coil 1 and transformer increase, until dielectric breakdown is increased Time increases, therefore can be improved by increasing the height of collets 5 and increasing creepage distance.Therefore, it is intended that in certain journey Ensure the height of collets 5 on degree.As an example, the height from the bottom of collets 5 to the upper surface of the first support 5a can be with It is about 10cm.

In transformer according to first embodiment, primary coil 1 is high-tension coil, and secondary coil 2 is low-voltage coil.Cause This, it is often more important that increase primary coil 1 and frame 20(or metal fittings 7) between creepage distance.Therefore, the first support portion The height of 5a is higher than the height of the second support portion 5b.

In addition, groove is arranged between the first support section 5a and the second support section 5b of collets 5.It therefore, can be with Increase the creepage distance between primary coil and secondary coil.Periodically cleaning and inspection are placed on a large amount of dusts, moisture and Molding transformer in the particular surroundings of salt is extremely important.Some mold transformers use such structure, and wherein insulating film is only On the spot it is arranged in the space segment 11 of primary coil and secondary coil, but when film is arranged in space segment 11, it is secondary The state confirmation of coil becomes difficult.Using this structure, primary coil 1 and padded coaming can be visually easily verified that The state of contact portion 4b between the state and secondary coil 2 and padded coaming 4 of contact portion 4a between 4, and carry out Such as clean maintenance.It also improves.

Example 2

Next, reference Fig. 4 and Fig. 5 to be described to example 2 of the invention.It is real according to second other than the structure of support construction The structure for applying the mold transformer of example is identical as the structure of mold transformer according to first embodiment.Therefore, in the following, focusing on Support construction part.Fig. 6 is to show the primary coil 1 and secondary coil 2 according to the second embodiment positioned at mold transformer The cross-sectional view of one of the support construction part of lower end.Other than the structure described in the first embodiment, implement according to second The support construction of example is plate, and area is greater than the metal fittings 7 of 5 lower section of bottom section and collets of collets 5.Arrange certain A wide insulation board 8.In addition, in first embodiment, support knot positioned at the upper end of primary coil 1 and secondary coil 2 Structure part is substantially symmetrically constructed with Fig. 1.However, being not provided with wide insulation board 8 between collets 5 and metal fittings 7. In the following, being illustrated centered on the support construction part for being located at coil end portion.

Insulator block 5 and wide insulation board 8 shift in order to prevent, and collets 5 and wide insulation board 8 are solid by position retaining pin 6' Determine onto metal fittings 7.It is for the creepage distance between extension coil and metal fittings 7 or frame 20 that wide insulation board 8, which is arranged,. Therefore, wide insulation board 8 (circumferential lengths) at least more wider than collets 5 and/or metal fittings 7 and longer (radical length).

Since wide insulation board 8 is not integrated with collets 5 and is individual structure, so the component of a variety of materials can be used In wide insulation board 8, as long as it is insulator.It is, for example, possible to use glass laminated used in the insulator block part 5 Body etc., or the component made of the material different from the material of insulator block part 5 can be used.

By using the structure for being inserted into wide insulation board 8, from coil to metal fittings 7(or frame 20) creepage distance prolong It is long.7 creepage distance is longer from coil to metal fittings, and the time that dielectric breakdown occurs is longer.By the way that width is arranged as shown in Figure 7 Insulation board 8, surface distance of the wide insulation board 8 on the height dimension of collets 5 is also that creepage distance is (shown in dotted lines in Figure 6 Section L is creepage distance).It is applied to IS).Therefore, the time until dielectric breakdown can be extended.

Further, since wide insulation board 8 and collets 5 are separable, so collets 5 and wide insulation board 8 can separate Replacement.Moreover, the transformer that collets 5 are applied to various sizes is become easy.When wide insulation board 8 is integrated in collets 5 When together, when collets 5 are arranged in miniature transformer, wide insulation board 8 may interfere with other structures.Prepare various types Wide insulation board 8, and various sizes of wide insulation board 8 is properly selected according to the size of the transformer to be arranged.This is usually It can be applied to other transformers, and the manufacturing cost of collets 5 can be reduced.

The modification of the support construction part of mold transformer according to the second embodiment will be described referring to Fig.1.It is real second It applies in example, it has been described that wide insulation board 8 has the configuration example of flat surfaces.However, the shape of wide insulation board 8 is not limited to put down Smooth surface.In the variation, wide insulation board 8 will be described and be provided with inclined example, that is, with wide insulation board 8 end from The wide insulation board 8 of the shape of central part decline.

Fig. 8 shows the example for being provided with the structure of inclined wide insulation board 8'.Fig. 8 is when collets 5 are arranged in coil Lower end when, from the outside of transformer towards collets 5 from center, metal fittings 7 and width insulation board 8' when structure chart. In this way, being lower than the structure of center portion by using the outside of wide insulation board 8', it can prevent water droplet etc. from resting on wide insulation board On the surface of 8'.Note that the shape of wide insulation board 8' is not limited to shape shown in Fig. 2.Various shape can be used, as long as end Portion is lower than central part and the water droplet etc. for being attached to upper surface hardly stops.It is, for example, possible to use trapezoidal wide insulation boards.

In addition, the wide hang plate 8 for being arranged in coil lower end makes width using wide 8 inclined structure of insulation board The end of insulation board 8' drops downwards from center, as shown in Figure 2.It arranges in place.

If Unitarily molded (hereinafter, wide insulation board 8 and collets 5 are Unitarily molded, referred to as wide insulation board 8 and collets 5 " wide collets "), then it is arranged in lower end.Wide collets and wide collets for upper part to be arranged in must be prepared separately. As shown in figure 8, the wide collets for lower end to be arranged in have a structure in which, wherein the end of wide insulation board part is being arranged Decline at lower end from center.If its original sample is arranged in upper end, the end of wide insulation board part faces upward in upper end, this It is not preferred, because water droplet etc. tends to assemble.Therefore, the wide collets that upper end is arranged in need to have and be arranged under The different structure of the wide collets of end (for example, the collets for not having wide insulating plate section).

If separating wide insulation board and collets as second embodiment or this variation, only in upper end, setting is exhausted Edge block, and it is not provided with wide insulation board.It can prevent water droplet etc. from resting on the surface of object block 5.It therefore, can be to upper end Identical collets are used with lower end, are respectively arranged to the collets of lower end be arranged in and for upper end to be arranged in Collets.It is not necessary to create it.

In addition, the structure in the not set wide insulation board in upper end is described above, but can also be arranged in upper end Wide insulation board.In such a case it is possible to be carried out on identical direction the case where being configured with wide insulation board 8' with lower end Installation.In other words, it may be mounted so that the outside of wide insulation board 8' lower than central part.Then, it is installed in lower end The case where wide insulation board 8', is the same, can prevent water droplet etc. from resting on and be arranged near the collets of upper end.

Example 3

Then, the third embodiment of the present invention will be described with reference to Fig. 4 and Fig. 5.Other than the structure of support construction, according to third The structure of the mold transformer of embodiment is identical as the structure of mold transformer according to first embodiment.Fig. 9 shows coil The cross section of (primary coil 1, secondary coil 2) and support construction (collets 5, metal fittings 7, frame 20), the support construction Support the coil (primary coil 1, secondary coil 2) in mold transformer according to the third embodiment.Yes.Figure 10 is support knot The perspective view of structure.

In mold transformer according to first embodiment, padded coaming 4 is arranged between coil and collets 5.It is another Aspect, in mold transformer according to the third embodiment, padded coaming 4 is arranged below collets 5, and primary coil 1 It is directly supported with secondary coil 2 by collets 5.Other aspects are identical as transformer according to first embodiment.

Silicon rubber for padded coaming 4 has the resin mass 3 than wherein molded coil, made of glass laminate absolutely Edge blocks 5 etc. have lower relative dielectric constant, and easily cause dielectric breakdown.Therefore, in mould according to the third embodiment In transformer processed, padded coaming 4 is arranged in the position far from coil, to reduce the concentration of electric field and make it difficult to cause Dielectric breakdown.

In addition, above description is based on structure described in Fig. 3, that is, without the structure of wide insulation board 8, but third is implemented The method of example also can be applied to the structure of transformer according to the second embodiment.Figure 11 shows the example of configuration.Figure 11 table Show and be combined with the structure of embodiment 2 and embodiment 3, is configured with wide insulation board 8 in the lower section of the collets such as glass laminate 5, It is fitted between part 7 in wide insulation board 8 and metal and accompanies silicon rubber.Padded coaming 4 such as is provided.It, can using this structure With the creepage distance between extension coil and metal fittings 7, and it can reduce the concentration of the electric field on padded coaming 4.

As another embodiment, padded coaming 4 be can be set between collets 5 and wide insulation board 8.

Example 4

Hereinafter, the fourth embodiment of the present invention will be described with reference to Fig. 4.

Figure 12 is the cross-sectional view according to the secondary coil 2 of the mold transformer of fourth embodiment.In addition to by insulating paper 9 and absolutely Except insulating film made of marginal zone 10 is arranged on the outer peripheral portion of secondary coil 2, according to the mold transformer of fourth embodiment Construction and first, the construction of second or third embodiments is identical.This is identical as according to above-mentioned mold transformer.

By the way that insulating paper 9 and insulating tape 10 to be fixed to the outer peripheral portion of secondary coil 2, the anti-pollution of transformer can be improved Property and resistance to pressure.Further, since which improve insulating properties, it is possible to make the space between primary coil 1 and secondary coil 2 (for example, space segment 11 in Fig. 3) is narrower.It in this case, can due to can reduce the diameter of primary coil 1 To reduce the size of transformer.

Maintenance is also critically important using mold transformer in the particular surroundings of moisture and salt for a large amount of dusts.Such as It is described in the first embodiment, by be arranged in the space segment 11 of primary coil 1 and secondary coil 2 method of insulating film come Improve insulation performance, and reduces the insulation distance between coil to reduce the size of transformer.This is possible.But In When using mold transformer with a large amount of dusts, in the particular surroundings of moisture and salt, clean also critically important.If using this knot Structure is difficult to clean secondary coil if placing insulator in space.By using this structure, transformer ruler may be implemented Very little reduction and maintainable raising.

Example 5

Then, the structure of the mold transformer of embodiment 5 is illustrated.Figure 13 is the mold transformer according to the 5th embodiment Transformer coil (primary coil 1 and secondary coil 2) and support coil support construction cross-sectional view.Figure 14 is according to The perspective view of the support construction of five embodiments, Figure 15 are the structure charts according to the support construction of the 5th embodiment.

In mold transformer according to the second embodiment, as shown in fig. 6, wide insulation board 8 is arranged in collets 5 and transformation Between device accessory 7, and there is the structure for ensuring creepage distance L.On the other hand, in the molding transformation according to the 5th embodiment In device, as shown in figure 13, by the way that wide insulation board 8a and 8b to be arranged in the upper and lower part of collets 5, further extend Wide creepage distance.Yes.Implemented according to other aspects of the mold transformer of the 5th embodiment with according to first to fourth Other aspects of the mold transformer of example are identical.

However, wide insulation board 8a and 8b does not have the structure being directly molded on collets 5 by machining etc..Such as figure Shown in 15, the groove for being assembled to wide insulation board 8a and 8b in collets 5 is moulded.Then, wide insulation board 8a and 8b is filled It is fitted in groove, to form support construction as shown in Figure 2.

It is produced when between the slot and wide insulation board 8a and 8b in the mating part between collets 5 and wide insulation board 8c and 8d When raw gap, gap silicon or insulating resin filling.Of course, it is possible to accurate fit dimension is formed by machining, so that Gap is not generated between the slot being arranged in collets 5 and wide insulation board 8a and 8b.However, by being filled out with silicon or insulating resin Gap is filled, when occurring to track phenomenon, it is easier to prevent the groove part by being formed in collets 5 from forming circuit.It utilizes This structure, when forming circuit on collets 5 and wide insulation board 8a and 8b by tracking etc., by replacing wide insulation board 8a Insulation performance can easily be restored with 8b.I can be with.Moreover, the insulation performance of collets 5 can be by polishing institute's shape with file At circuit surface or restored by coating coatings or varnish.

In the present embodiment, it has been described that the example of two wide insulation boards is arranged in collets 5, however, wide insulation Plate can be arranged only at a place.For example, wide insulation board 8b can be arranged only.

Example 6

Figure 16 is the structure chart according to the support construction of the mold transformer of sixth embodiment.In addition to main points described below (branch The structure of support structure) except, according to the structure of the mold transformer of sixth embodiment and according to the mould of the first to the 5th embodiment The structure of transformer processed is identical.

In the 5th embodiment, it has been described that by the way that wide insulation board 8a and 8b is assembled to collets 5 from a direction To extend the example of creepage distance.In the mold transformer according to sixth embodiment, as shown in figure 16, relative to collets 5 A groove is formed in a circumferential direction.Then, wide insulation board 8c and 8d is inserted into the groove part to be formed.At this point, wide absolutely Listrium 8c and 8d are arranged so that collets 5 are clipped between wide insulation board 8c and 8d.Mating part and width about collets 5 is exhausted Listrium 8c and 8d, gap can use silicon, the filling such as insulating resin, as in the 5th embodiment.

It is the description to the embodiment of the present invention above.In addition, the present invention is not limited to the above embodiments, including various modifications. For example, in above-mentioned each embodiment, it has been described that coil is cylindrical example, however, the shape of coil is not limited to justify Cylindricality.For example, it can be rectangle.Above-described embodiment is described in detail in order to understand the present invention, and need not limit In with those of described all configurations embodiment.

For example, in above-mentioned each embodiment, it has been described that coil is cylindrical example, however, the shape of coil It is not limited to cylinder.For example, it can be rectangle.Alternatively, it is also possible to make the first support portion and the second support portion of insulator As other structures.Furthermore it is also possible to which a part addition of the configuration for each embodiment, deletes and replaces other assemblies.

Claims (10)

1. a kind of mold transformer has primary coil, time that primary coil is internally provided with the state of predetermined space is set Grade coil, frame, and multiple support constructions of support primary and secondary coil, which includes dielectric material block, it It indicates by having the area bigger than the floor space of collets, wide insulation board evidence between the end of multiple primary and secondary bobbins Those of provide, wherein the upper surface of the insulator block, provides a kind of for supporting secondary coil and being used to support described Second supporting part of the end of the first support section of the end of primary coil, the insulation mold transformer, wherein wide insulation Plate is arranged between the lower surface of object block and frame.

2. molding transformer according to claim 1, wherein the collets, the width insulation board and it is attached to the frame The metal fittings of frame are fixed by position retaining pin.

3. molding transformer according to claim 1 or 2, wherein the collets have groove, and the wide insulation Plate is inserted into the groove.

4. molding transformer according to claim 1, wherein the height of first support section is higher than described second The height of support part point.

5. mold transformer according to claim 1, wherein in first support section and second support section Between be provided with recess portion.

6. mold transformer according to claim 1, wherein be arranged between the lower end and frame of primary and secondary coil Multiple support constructions, and wide insulation board is provided with inclination, and primary and secondary coil.

7. molding transformer as described in claim 1, which is characterized in that the end that the wide insulation board of lower end is arranged in is located at The lower section of the central part of wide insulation board, multiple support constructions are arranged in the upper end of primary and secondary coil and are located at primary and two Between the frame of the upper end of secondary coil, and wide insulation board includes being obliquely installed, and the upper of primary coil and secondary coil is arranged in The end of the wide insulation board in portion, it is characterised in that the center of underlying width insulation board.

8. molding transformer according to any one of claim 1 to 7, wherein padded coaming setting is described primary and secondary Between grade overhang and the collets.

9. molding transformer according to any one of claim 1 to 8, wherein padded coaming setting in the collets and Between the frame.

10. molding transformer according to any one of claim 1 to 9, wherein insulating film is arranged in the secondary coil Periphery on.