CN110767419A - Evaporative cooling core type transformer - Google Patents
Evaporative cooling core type transformer Download PDFInfo
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- CN110767419A CN110767419A CN201911000530.5A CN201911000530A CN110767419A CN 110767419 A CN110767419 A CN 110767419A CN 201911000530 A CN201911000530 A CN 201911000530A CN 110767419 A CN110767419 A CN 110767419A
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- core
- voltage winding
- iron core
- transformer
- cooling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
Abstract
The invention belongs to the technical field of transformers, and particularly relates to an evaporative cooling core type transformer. In order to solve the problem that the existing layered winding structure can only form a cooling channel in the axial direction and has insufficient cooling capacity for the winding, the evaporative cooling core type transformer provided by the invention comprises an iron core, wherein a low-voltage winding and a high-voltage winding are sequentially wound along the radial direction of the iron core from inside to outside; a plurality of cushion strips are arranged between two adjacent coil cakes, and the two adjacent cushion strips are used for enabling a flow channel for radial flowing of a cooling working medium to be formed between the two adjacent coil cakes. According to the invention, the transformer coils are arranged in sections, so that the cooling working medium can flow radially between two adjacent coil cakes, and the cooling capacity of the transformer coils is greatly improved.
Description
Technical Field
The invention belongs to the technical field of transformers, and particularly relates to an evaporative cooling core type transformer.
Background
A transformer is a device that changes an alternating voltage using the principle of electromagnetic induction. When the transformer runs, heat is generated, and the problem of heat dissipation is a key factor for restricting the performance of the transformer. The prior art uses transformer oil cooling systems. The transformer oil cooling system has the following problems: firstly, the viscosity of the transformer oil is too high (10-15cs), the fluidity is poor, and the heat exchange efficiency is low; secondly, the oil cooling mode generally needs to force oil circulation cooling to dissipate heat of heating components in the transformer by using a specific heat exchange principle, and the transformer oil has low specific heat (1.8kJ/kg), which is about 40% of water, and has weak heat carrying capacity, so that the weight and the structural volume of the transformer are large.
The iron core of the core type transformer is surrounded by the winding, the winding iron core which is respectively wound by the high-voltage coil and the low-voltage coil is adopted to pull the transformer coil at present, and when the low-voltage coil and the high-voltage coil are wound outside the iron core column of the winding iron core, the supporting parts which are composed of paper tubes and supporting strips are arranged between the low-voltage coil and the iron core column and between the low-voltage coil and the high-voltage coil. The layered winding structure can only form a cooling channel in the axial direction, and the cooling capacity of the winding is insufficient.
Accordingly, the present invention proposes an evaporative cooling core transformer to solve the above problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem that the existing layered winding structure can only form a cooling channel in the axial direction and has insufficient cooling capacity for the winding, the invention provides a core transformer suitable for adopting an evaporative cooling technology, which comprises an iron core, wherein a low-voltage winding and a high-voltage winding are sequentially wound along the radial direction of the iron core from inside to outside, the low-voltage winding and the high-voltage winding are arranged along the axial direction of the iron core to form a segmented coil cake structure, and each coil cake is composed of a plurality of turns of low-voltage winding and a plurality of turns of high-voltage winding which are sequentially wound along the radial direction of the iron core from inside to outside; and a plurality of cushion strips are arranged between two adjacent coil cakes, and the two adjacent cushion strips are used for forming a flow channel for radial flow of the cooling working medium between the two adjacent coil cakes.
In a preferred embodiment of the evaporative cooling core transformer, a support bar is arranged between the high-voltage winding and the low-voltage winding, and the support bar is used for forming a flow channel for flowing a cooling working medium between the high-voltage winding and the low-voltage winding.
In a preferred embodiment of the above-described evaporation cooled core transformer, the insulation distance between the high-voltage winding and the low-voltage winding is matched to the thickness of the support bar and thus the support bar is secured in an extruded manner between the high-voltage winding and the low-voltage winding.
In a preferred embodiment of the above evaporative cooling core type transformer, the core type transformer further includes an iron core sleeve, the iron core sleeve is located between the low voltage winding and the iron core and is sleeved on the iron core; the iron core sleeve is provided with an iron core angle bead between the iron core sleeve and the iron core, and the iron core angle bead is used for supporting the iron core sleeve so that a flow channel for cooling working medium flowing is formed between the iron core sleeve and the iron core.
In an embodiment of the evaporative cooling core type transformer, the core sleeve is provided with a plurality of dovetail grooves along an axial direction, the filler strip between two adjacent coil cakes can be abutted against the dovetail grooves along a radial direction of the core sleeve to form an axial flow gap for cooling a working medium, and the axial flow gap is used for communicating a flow channel between each two adjacent coil cakes.
In a preferred embodiment of the evaporative cooling core type transformer, a plurality of long through holes are formed in the iron core sleeve at a part between two adjacent dovetail grooves, and the long through holes are used for circulation of a cooling working medium.
In a preferred embodiment of the above evaporative cooling core transformer, the core sleeve is made of glass fiber reinforced plastic.
In a preferred embodiment of the above-described evaporative cooling core transformer, the core back angle has an L-shaped cross section.
In a preferred embodiment of the above evaporative cooling core transformer, the cooling medium is an insulating organic liquid with a high latent heat of evaporation.
In a preferred embodiment of the above-described evaporation cooled core transformer, the core transformer is a traction transformer for use as a rail vehicle.
According to the invention, the transformer coils are arranged in sections, so that the cooling working medium can flow radially between two adjacent coil cakes, the contact area between the cooling working medium and the transformer coils is increased, and the cooling capacity of the transformer coils is greatly improved. The invention also arranges an iron core sleeve on the iron core to provide more flow channel gaps for cooling working medium, thereby realizing the full cooling of the transformer coil. In addition, the cooling working medium adopts insulating organic liquid with high latent heat of evaporation, and compared with the traditional forced oil cooling, the cooling working medium is non-combustible and non-explosive, so that the risk of combustibility of the transformer oil is completely eliminated, and the safety and reliability of a system level are greatly improved.
Drawings
FIG. 1 is a schematic cross-sectional view of an evaporatively cooled core transformer of the present invention;
FIG. 2 is a side schematic view of an evaporatively cooled core transformer of the present invention;
FIG. 3 is an enlarged view of area A of FIG. 2;
fig. 4 is a schematic view of the structure of an iron core sleeve of the evaporative cooling core transformer of the present invention;
FIG. 5 is a schematic view of the construction of the core angle bead of the evaporative cooling core transformer of the present invention;
fig. 6 is a schematic view of a spacer structure of an evaporative cooling core transformer in accordance with an embodiment of the present invention.
Description of the drawings: 1-a high voltage winding; 2-a low voltage winding; 3-an iron core; 4-an iron core sleeve; 41-dovetail groove; 42-long through hole; 5-iron core angle bead; 6-supporting strips; 7-cushion strip.
Detailed Description
In order to make the embodiments, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the embodiments are some, but not all embodiments of the present invention. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
Referring first to fig. 1, fig. 1 is a schematic cross-sectional view of an evaporative cooling core transformer of the present invention. As shown in fig. 1, the core transformer of the present invention includes an iron core 3, a low voltage winding 2 and a high voltage winding 1 are sequentially wound from inside to outside along a radial direction of the iron core 3, the low voltage winding 2 and the high voltage winding 1 are arranged in a segmented coil cake structure along an axial direction of the iron core 3, and each coil cake is composed of a plurality of turns of the low voltage winding 2 and a plurality of turns of the high voltage winding 1 sequentially wound from inside to outside along the radial direction of the iron core 3. And a plurality of backing strips 7 are arranged between two adjacent coil cakes, and the two adjacent backing strips 7 are used for forming a flow channel for radial flow of the cooling working medium between the two adjacent coil cakes. The cooling working medium can adopt insulating organic liquid with high latent heat of evaporation, such as insulating organic liquid with high latent heat of evaporation and boiling point of 60-80 ℃.
According to the core type transformer structure designed by the invention, the transformer coils are arranged in a sectional mode. Specifically, a plurality of turns of the low-voltage winding 2 and a plurality of turns of the high-voltage winding 1 are sequentially wound from inside to outside along the radial direction of the iron core 3 to form a coil cake, so that the whole low-voltage winding 2 and the whole high-voltage winding 1 can form a plurality of independent coil cakes. For example, 50 turns of the low-voltage winding 2 and 100 turns of the high-voltage winding 1 are sequentially wound from inside to outside along the radial direction of the iron core 3, and each 1 turn of the low-voltage winding 2 and each 2 turns of the high-voltage winding 1 form a coil cake, so that the whole low-voltage winding 2 and the whole high-voltage winding 1 can form 50 independent coil cakes. This example is merely to facilitate understanding of the arrangement of the coil cakes and is not intended to limit the scope of the invention. As mentioned above, the segmented arrangement of the transformer coils can also be understood as a plurality of coil cakes arranged in sequence along the axial direction of the iron core 3.
Since a plurality of cushion strips 7 are arranged between two adjacent coil cakes, the two adjacent coil cakes can be effectively separated. By way of example, with reference to fig. 2 and 6 in conjunction with fig. 1, fig. 2 is a side view schematic of an evaporatively cooled core transformer of the present invention; fig. 6 is a schematic view of a spacer structure of an evaporative cooling core transformer in accordance with an embodiment of the present invention. As shown in fig. 1, 2 and 6, the spacer 7 has an elongated shape with one end near the outer edge of the high voltage coil 1 and the other end passing through the low voltage coil 2, thereby separating the adjacent two coil cakes. As an example, the backing strips 7 are arranged perpendicular to the axis of the iron core 3, so that a flow channel for radial flow of the cooling working medium can be formed between every two adjacent backing strips 7 between two adjacent coil cakes, thereby effectively increasing the contact area between the cooling working medium and the transformer coil and improving the heat exchange efficiency.
Referring back to fig. 1, a support bar 6 is disposed between the high voltage winding 1 and the low voltage winding 2, and the support bar 6 is used to form a flow passage for flowing a cooling working medium between the high voltage winding 1 and the low voltage winding 2. The insulation distance between the high-voltage winding 1 and the low-voltage winding 2 is matched to the thickness of the support strip 6 and thus the support strip 6 is secured in a compressed manner between the high-voltage winding 1 and the low-voltage winding 1. Therefore, the cooling working medium can flow along the flow channel, so that the contact area of the cooling working medium and the transformer coil is further effectively increased, and the heat exchange efficiency is improved. The length-width ratio of the cross-section end surface of the supporting strip 6 is not too large, the specific arrangement position and number of the supporting strip are determined by the mechanical strength requirements of the high-voltage winding 2 and the low-voltage winding 1, and the flow of the cooling working medium is not influenced.
In a specific embodiment, as shown in fig. 1 and 2, the core transformer of the present invention further includes an iron core sleeve 4 (as an example, the material of the iron core sleeve 4 may be glass fiber reinforced plastic), and the iron core sleeve 4 is located between the low voltage winding 2 and the iron core 3 and is sleeved on the iron core 3. Further, an iron core angle bead 5 is disposed between the iron core sleeve 4 and the iron core 3, and the iron core angle bead 5 is used for supporting the iron core sleeve 4 so as to form a flow channel for flowing of the cooling working medium between the iron core sleeve 4 and the iron core 3. To more clearly illustrate this structure, reference is now made to FIGS. 3-5, with FIG. 3 being an enlarged view of area A of FIG. 2; fig. 4 is a schematic view of the structure of an iron core sleeve of the evaporative cooling core transformer of the present invention; fig. 5 is a schematic view of the structure of the core angle bead of the evaporative cooling core transformer of the present invention.
As shown in fig. 3-5, the iron core angle bead 5 has an L-shaped cross section, which is clamped at the corner of the iron core 3, the iron core sleeve 4 is cylindrical, and when the iron core sleeve 4 is sleeved on the iron core 3, the outer corner of the iron core angle bead 5 contacts with the iron core 4 sleeve and supports the iron core sleeve 4. In this way, a flow channel for the flow of the cooling medium can be formed between the core sleeve 4 and the core 3. Thereby further increasing the contact area of the cooling working medium and the transformer coil and improving the heat exchange efficiency.
In a more specific embodiment, as shown in fig. 4, the core sleeve 4 is provided with a plurality of dovetail grooves 41 along the axial direction. Under the condition that the iron core sleeve 4 is sleeved on the iron core 3, the low-voltage winding 2 and the high-voltage winding 1 are sequentially wound from inside to outside along the radial direction of the iron core 3, which is equivalent to the low-voltage winding 2 and the high-voltage winding 1 are sequentially wound from inside to outside along the radial direction of the iron core sleeve 4. In this way, the filler strip 7 between two adjacent coil cakes can abut against the dovetail groove 41 in the radial direction of the core sleeve 4 to form an axial flow gap for the cooling medium, which axial flow gap is used to communicate with the flow channel between each two adjacent coil cakes. In other words, the cooling medium can flow through each coil cake in turn along the dovetail groove 41 in the axial direction, i.e., the flow channel between each two adjacent coil cakes is connected. Thereby further increasing the contact area of the cooling working medium and the transformer coil and improving the heat exchange efficiency.
With continued reference to fig. 4, a plurality of through holes 42 are formed in the core sleeve 4 at a portion between two adjacent dovetail grooves 41, and the through holes 42 are used for the circulation of the cooling medium. It will be understood by those skilled in the art that the elongated through hole 42 allows the cooling medium to pass freely therethrough, and the core angle 5 is installed at a position that does not overlap the elongated through hole as much as possible so as not to affect the flow of the cooling medium.
As an example, the core transformer may be used as a traction transformer for a rail vehicle, such as mounted on the bottom of a vehicle.
According to the invention, the transformer coils are arranged in sections, so that the cooling working medium can flow radially between two adjacent coil cakes, the contact area between the cooling working medium and the transformer coils is increased, and the cooling capacity of the transformer coils is greatly improved. The invention also arranges an iron core sleeve on the iron core to provide more flow channel gaps for cooling working medium, thereby realizing the full cooling of the transformer coil. In addition, the cooling working medium adopts insulating organic liquid with high latent heat of evaporation, and compared with the traditional forced oil cooling, the cooling working medium is non-combustible and non-explosive, so that the risk of combustibility of the transformer oil is completely eliminated, and the safety and reliability of a system level are greatly improved.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. An evaporation cooling core type transformer, which comprises an iron core, and a low-voltage winding and a high-voltage winding are sequentially wound from inside to outside along the radial direction of the iron core, and is characterized in that,
the low-voltage winding and the high-voltage winding are arranged into a segmented coil cake structure along the axial direction of the iron core, and each coil cake consists of a plurality of turns of low-voltage winding and a plurality of turns of high-voltage winding which are sequentially wound from inside to outside along the radial direction of the iron core;
and a plurality of cushion strips are arranged between two adjacent coil cakes, and the two adjacent cushion strips are used for forming a flow channel for radial flow of the cooling working medium between the two adjacent coil cakes.
2. The evaporative cooling core transformer of claim 1, wherein a support bar is disposed between the high voltage winding and the low voltage winding, the support bar being configured to form a flow channel between the high voltage winding and the low voltage winding for the flow of cooling medium.
3. The evaporative cooling core transformer of claim 2, wherein the insulation distance between the high voltage winding and the low voltage winding matches the thickness of the support bar and thereby compressively secures the support bar between the high voltage winding and the low voltage winding.
4. The evaporative cooling core transformer of claim 2, further comprising a core sleeve positioned between the low voltage winding and the core and sleeved over the core;
the iron core sleeve is provided with an iron core angle bead between the iron core sleeve and the iron core, and the iron core angle bead is used for supporting the iron core sleeve so that a flow channel for cooling working medium flowing is formed between the iron core sleeve and the iron core.
5. The evaporative cooling core transformer of claim 4, wherein the core sleeve has a plurality of dovetail slots formed therein in an axial direction,
the filler strip between two adjacent coil cakes can be abutted against the dovetail groove along the radial direction of the iron core sleeve to form an axial flow gap for cooling working media,
the axial flow gap is used for communicating the flow channel between each two adjacent coil cakes.
6. The evaporative cooling core type transformer according to claim 5, wherein a plurality of through holes are formed in the core sleeve at a portion between two adjacent dovetail grooves, and the through holes are used for circulation of a cooling medium.
7. The evaporative cooling core transformer of claim 6, wherein the core sleeve is formed of glass reinforced plastic.
8. The evaporative cooling core transformer according to any of claims 4 to 7, wherein the core back angle is L-shaped in cross section.
9. The evaporative cooling core transformer of any of claims 1 to 7, wherein the cooling working medium is an insulating organic liquid of high latent heat of evaporation.
10. The evaporative cooling core transformer according to any of claims 1 to 7, wherein the core transformer is a traction transformer for use as a rail vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911000530.5A CN110767419A (en) | 2019-10-21 | 2019-10-21 | Evaporative cooling core type transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911000530.5A CN110767419A (en) | 2019-10-21 | 2019-10-21 | Evaporative cooling core type transformer |
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| CN110767419A true CN110767419A (en) | 2020-02-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112447376A (en) * | 2020-11-24 | 2021-03-05 | 中国科学院电工研究所 | Distributed winding evaporative cooling transformer |
| CN114694923A (en) * | 2022-05-30 | 2022-07-01 | 苏州好博医疗器械股份有限公司 | Sectional type heat radiation structure of electromagnetic coil |
-
2019
- 2019-10-21 CN CN201911000530.5A patent/CN110767419A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112447376A (en) * | 2020-11-24 | 2021-03-05 | 中国科学院电工研究所 | Distributed winding evaporative cooling transformer |
| CN114694923A (en) * | 2022-05-30 | 2022-07-01 | 苏州好博医疗器械股份有限公司 | Sectional type heat radiation structure of electromagnetic coil |
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