CN217010446U - Mixed material stator core for turbonator and turbonator - Google Patents
Mixed material stator core for turbonator and turbonator Download PDFInfo
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- CN217010446U CN217010446U CN202122725954.7U CN202122725954U CN217010446U CN 217010446 U CN217010446 U CN 217010446U CN 202122725954 U CN202122725954 U CN 202122725954U CN 217010446 U CN217010446 U CN 217010446U
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Abstract
The utility model discloses a mixed material stator core for a steam turbine generator and the steam turbine generator, belonging to the technical field of steam turbine generator devices; the structure comprises an iron core, wherein the iron core comprises an iron core middle section and iron core end sections, the iron core middle section is positioned in the middle of the iron core in the axial direction and is made of non-oriented silicon steel sheets, the iron core end sections are arranged at two end parts of the iron core middle section and are made of oriented silicon steel sheets, and special ventilation channel steel is arranged at the joint of the iron core middle section and the iron core end sections; the generator stator core adopts a segmented design, the problems caused by the design of adopting pure non-oriented silicon steel sheets or pure oriented silicon steel sheets in the traditional technology can be effectively solved through the design, the performance of a generator is difficult to ensure by adopting the non-oriented silicon steel sheets under the condition of limited design space, the performance of the generator is ensured by adopting the oriented silicon steel sheets, but the cost is overhigh, the structure is effectively combined with the magnetic distribution characteristic of the core structure to carry out the segmented design, the effective application of the core material on the engineering is reasonably realized, and the use cost of the material is effectively reduced while the performance of the generator is ensured.
Description
Technical Field
The utility model relates to a mixed material stator core for a steam turbine generator and the steam turbine generator, and belongs to the technical field of steam turbine generator devices.
Background
The iron core of the turbonator is formed by laminating silicon steel sheets, the silicon steel sheets are divided into oriented silicon steel sheets and non-oriented silicon steel sheets according to performances, the main difference between the oriented silicon steel sheets and the non-oriented silicon steel sheets is that the magnetic conductivity of the oriented silicon steel sheets in different orientations is greatly different, the magnetic conductivity and the loss of the oriented silicon steel sheets in the same rolling orientation are superior to those of the non-oriented silicon steel sheets, and especially when a magnetic circuit is saturated and the magnetic flux density is high, the magnetic flux leakage flux and the loss of the iron core are smaller. However, the oriented silicon steel sheet has a high price, which is about 2.5 to 3 times that of the non-oriented silicon steel sheet.
Prior art 1 (stator core using no-oriented silicon steel sheet throughout): the advantage of this technique is that the stator core is less costly. The defects are that the magnetic conductivity of the non-oriented silicon steel sheet is relatively poor, the allowable value of the magnetic flux density of the iron core is relatively low, and the magnetic leakage flux of the iron core is more; meanwhile, the stator core has large loss and high temperature rise. In order to reduce the magnetic flux density of the stator core, the outer diameter of the core can be designed to be relatively large, and the generator can be ensured to safely operate under various working conditions. And external factors (hoisting, transportation weight and size and the like) tend to limit the design size of the outer diameter of the stator core, so that the design of the generator core is more difficult.
Prior art 2 (stator core with oriented silicon steel sheet used throughout): the advantages of this technique are: the oriented silicon steel sheet has relatively good magnetic conductivity and less loss, so that the allowable value of the magnetic flux density of the iron core is higher, the temperature rise of the stator iron core is lower, the magnetic flux leakage of the iron core is less, and the small outer diameter design of the iron core can ensure that the generator can safely operate under various working conditions. The disadvantages are that the price of the oriented silicon steel sheet is about 2.5-3 times of that of the non-oriented silicon steel sheet iron core, and the weight of the stator iron core accounts for about one third of the total weight of the turbonator, so that the cost of the turbonator is higher.
Disclosure of Invention
The utility model aims to: to the problem that above-mentioned exists, provide a combined material stator core and turbo generator that turbo generator used, this mode not only can effectual assurance generator's performance, can also reduce the manufacturing cost of generator simultaneously.
The technical scheme adopted by the utility model is as follows:
the utility model provides a combined material stator core that turbo generator used, includes the iron core, the iron core is including the iron core middle section that the non-oriented silicon steel sheet that is located the middle part was made to and set up in the iron core end section that the adoption at iron core middle section both ends has the oriented silicon steel sheet to make, is provided with the ventilation channel-section steel in iron core middle section and iron core end section linking department, in order to form very big air gap magnetic resistance, prevents to form harmful axial magnetic circuit.
Furthermore, the main body of the ventilation channel steel is made of non-magnetic steel materials.
Furthermore, lining plates made of non-magnetic steel materials are arranged on two sides of the ventilation channel steel.
Furthermore, the outer sides of the lining plates are respectively provided with an insulating layer.
Furthermore, the width of the ventilation channel steel is 3mm-10mm.
Further, the length of the middle section of the iron core accounts for 70% -90% of the total length of the iron core along the axial direction of the iron core.
Further, the length of the end section of the iron core occupies 15% -5% of the total length of the iron core along the axial direction of the iron core.
Furthermore, the iron core middle section and the iron core end section adopt silicon steel sheets with the same thickness.
Furthermore, the iron core middle section and the iron core end section adopt silicon steel sheets with different thicknesses. The middle section of the iron core adopts a silicon steel sheet with the thickness of 0.5mm, and the end section of the iron core adopts a silicon steel sheet with the thickness of 0.35 mm.
Furthermore, the iron core comprises a plurality of steel sheets, and the iron core is assembled by overlapping the steel sheets and tightening the screw rods.
Furthermore, the middle section of the iron core is assembled in an overlapping mode through non-oriented silicon steel sheets, and the end part of the iron core is assembled in an overlapping mode through oriented silicon steel sheets.
A steam turbine generator comprises the mixed material stator core for the steam turbine generator.
In summary, due to the adoption of the technical scheme, the utility model has the beneficial effects that:
according to the mixed material stator core for the turbonator and the turbonator, the stator core of the generator is designed in a segmented mode, the problem caused by the fact that pure non-oriented silicon steel sheets or pure oriented silicon steel sheets are adopted in the traditional technology can be effectively solved through the design, the performance of the generator is difficult to guarantee by adopting the non-oriented silicon steel sheets under the condition that the design space is limited, the performance of the generator is guaranteed by the oriented silicon steel sheets, but the cost is too high, the structure effectively combines the magnetic distribution characteristics of the iron core structure to carry out segmented design, the iron core material is reasonably and effectively applied to engineering, and the use cost of the material is effectively reduced while the performance of the generator is guaranteed.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the axial flux density distribution of the generator core;
FIG. 3 is an enlarged view of a portion of FIG. 1;
FIG. 4 is an enlarged schematic view of FIG. 3 at A;
FIG. 5 is a schematic view of a structure without an insulating layer;
fig. 6 is an enlarged schematic view of B in fig. 5.
The labels in the figure are: 1-iron core middle section, 2-iron core end section, 3-ventilation channel steel, 4-lining plate and 5-insulating layer.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Example 1
The utility model provides a combined material stator core that turbo generator used, as shown in fig. 1 to 6, includes the iron core, the iron core is including the iron core middle section 1 that the non-oriented silicon steel sheet that is located the middle part was made to and set up in the adoption at 1 both ends in iron core middle section have iron core end section 2 that the oriented silicon steel sheet was made, is provided with ventilation channel-section steel 3 in iron core middle section 1 and iron core end section linking department to form very big air gap magnetic resistance, prevent to form harmful axial magnetic circuit.
In the present embodiment, the magnetic field environment at both ends of the generator core is relatively complex, and includes a generator rotor end leakage magnetic field, a stator coil current induction magnetic field, and a stator lead induction magnetic field; after the magnetic fields are superposed and synthesized, the magnetic density level of the magnetic fields at the two ends of the iron core is far higher than that of the middle iron core; under the abnormal operation working condition of the generator (such as overvoltage, low frequency, phase-advancing operation and the like), the magnetic density level of the magnetic field at two ends of the iron core can become higher, and when the magnetic density level exceeds the saturation value of the silicon steel sheet, a large amount of leakage magnetic flux can be generated, and the leakage magnetic flux comprises axial leakage magnetic flux with larger hazard. Based on the analysis to the magnetic field distribution characteristic of generator, adopted the design of multistage formula structure, main structural design adopts middle part section and both ends tip section to adopt different materials to realize the reduction of cost, and increase the effectual stability that promotes whole structure of design of ventilation groove steel construction.
On the basis of the design of the specific structure, as a further design, the side wall of the ventilation channel steel 3 is made of a non-magnetic steel material. The ventilation channel steel forms a large air gap magnetic resistance in the axial direction, and a harmful axial magnetic circuit is prevented from being formed.
On the basis of the design of the specific structure, in the specific design, the two sides of the ventilation channel steel 3 are provided with lining plates 4 made of non-magnetic steel materials. The non-magnetic ventilation channel steel and the thin steel plate are arranged on the axial magnetic circuit, so that the magnetic resistance is large, the formation of the axial magnetic circuit is prevented, the heat generation can be reduced, and the local temperature rise of the iron core is reduced.
In a more specific design, in order to achieve a better effect, an insulating layer 5 is further provided on the outer side of the lining plate 4. The stator section of the middle part of the stator section is separated from the stator section of the end part of the stator section, so that the heating condition is effectively reduced, and the local temperature rise of the joint is reduced.
As a more specific design, the design of the ventilation channel needs further optimization, and a wider ventilation channel steel is generally adopted (the width value of the ventilation channel steel is determined according to the distribution of the magnetic field inside the iron core). In the specific design, the width of the ventilation channel steel 3 is 3mm-10mm. As a specific design, a design of 5mm is generally adopted as a preferable design.
Based on the design basis of above-mentioned concrete structure, to the concrete design of stator core, on the performance basis of guaranteeing the generator, combine effectual reduction material to rise originally, the length of iron core middle section 1 accounts for 70% -90% of iron core total length along iron core axial direction. As a specific design, the cost of the whole stator core can be effectively reduced by adopting low-cost materials in the middle section of the core. In general, the length of the stator core of a steam turbine generator is 8m as an example, and the length of the core middle section 1 occupies 90% of the total length of the core along the axial direction of the core. The design with the length can effectively ensure the whole structure and maximally realize low-cost manufacture. Meanwhile, the occupation ratio of the stator core is considered to be a little smaller under the condition that the size of the stator core is not large.
As a more specific design, based on the above specific structural design, the length of the end section 2 of the iron core occupies 15% to 5% of the total length of the iron core along the axial direction of the iron core. Similarly, the length of the stator core of a steam turbine generator is 8m, and the length of the end section 2 of the core occupies 5% of the total length of the core along the axial direction of the core. Meanwhile, the occupation ratio of the stator core is considered to be a little larger under the condition that the size of the stator core is not large.
On the basis of the specific structural design, the iron core middle section 1 and the iron core end section 2 adopt silicon steel sheets with the same thickness. Or, the iron core middle section 1 and the iron core end section 2 adopt silicon steel sheets with different thicknesses. When the iron core middle section 1 and the iron core end section 2 adopt silicon steel sheets with different thicknesses, the iron core middle section 1 adopts a non-oriented silicon steel sheet with the thickness of 0.5mm, and the iron core end section 2 adopts an oriented silicon steel sheet with the thickness of 0.35 mm.
On the basis of the above specific design, as a specific design, and as a specific description in the background art, as a more specific description, the iron core includes a plurality of steel sheets, and the iron core is assembled by overlapping the plurality of steel sheets and tightening the screw 6.
On the basis of combining the specific structural design, the more specific design is that the iron core middle section 1 is assembled by overlapping non-oriented silicon steel sheets, and the iron core end 2 is assembled by overlapping oriented silicon steel sheets.
Example 2
A steam turbine generator comprising a mixed material stator core for a steam turbine generator as designed in example 1.
In conclusion, the mixed material stator core for the turbonator and the turbonator can effectively solve the problems caused by the design of pure non-oriented silicon steel sheets or pure oriented silicon steel sheets in the traditional technology by adopting the segmented design of the stator core of the generator, the performance of the generator is difficult to ensure by adopting the non-oriented silicon steel sheets under the condition of limited design space, the performance of the generator is ensured by adopting the oriented silicon steel sheets, but the cost is too high, the structure effectively combines the magnetic distribution characteristics of the iron core structure to carry out the segmented design, the iron core material is reasonably and effectively applied to the engineering, and the use cost of the material is effectively reduced while the performance of the generator is ensured.
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the utility model, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model.
Claims (10)
1. The utility model provides a combined material stator core that turbo generator used which characterized in that: the iron core comprises an iron core, the iron core middle section (1) that the iron core was made including the non-oriented silicon steel sheet that is located the middle part in the axial direction to and set up in iron core tip section (2) that the adoption at iron core middle section (1) both ends has the oriented silicon steel sheet to make, be provided with ventilation channel-section steel (3) in iron core middle section (1) and iron core tip section linking department, in order to form very big air gap magnetic resistance, prevent to form harmful axial magnetic circuit.
2. A mixed material stator core for a steam turbine generator as claimed in claim 1, wherein: the main body of the ventilation channel steel (3) is made of non-magnetic steel materials.
3. A mixed material stator core for a steam turbine generator as claimed in claim 2, wherein: and lining plates (4) made of non-magnetic steel materials are arranged on two sides of the ventilation channel steel (3).
4. A mixed material stator core for a steam turbine generator as claimed in claim 3, wherein: and insulating layers (5) are respectively arranged on the outer sides of the lining plates (4).
5. A mixed material stator core for a steam turbine generator as claimed in claim 2, wherein: the width of the ventilation channel steel (3) is 3mm-10mm.
6. A mixed material stator core for a steam turbine generator as claimed in claim 1, wherein: the length of the iron core middle section (1) accounts for 70% -90% of the total length of the iron core along the axial direction of the iron core.
7. A mixed material stator core for a steam turbine generator as claimed in claim 1, wherein: the length of the iron core end section (2) occupies 15% -5% of the total length of the iron core along the axial direction of the iron core.
8. A mixed-material stator core for a turbo-generator according to claim 1 or 7, wherein: the iron core middle section (1) and the iron core end section (2) are made of silicon steel sheets with the same thickness.
9. A mixed-material stator core for a turbo-generator according to claim 1 or 7, wherein: the iron core middle section (1) and the iron core end section (2) adopt silicon steel sheets with different thicknesses, the iron core middle section (1) adopts a non-oriented silicon steel sheet with the thickness of 0.5mm, and the iron core end section (2) adopts an oriented silicon steel sheet with the thickness of 0.35 mm.
10. A turbonator characterized by: a mixed material stator core for a steam turbine generator comprising a stator core for a steam turbine generator as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122725954.7U CN217010446U (en) | 2021-11-09 | 2021-11-09 | Mixed material stator core for turbonator and turbonator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122725954.7U CN217010446U (en) | 2021-11-09 | 2021-11-09 | Mixed material stator core for turbonator and turbonator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217010446U true CN217010446U (en) | 2022-07-19 |
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ID=82379501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122725954.7U Active CN217010446U (en) | 2021-11-09 | 2021-11-09 | Mixed material stator core for turbonator and turbonator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217010446U (en) |
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2021
- 2021-11-09 CN CN202122725954.7U patent/CN217010446U/en active Active
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