CN210167879U - Copper shielding structure of stator core end of steam turbine generator - Google Patents
Copper shielding structure of stator core end of steam turbine generator Download PDFInfo
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- CN210167879U CN210167879U CN201921269420.4U CN201921269420U CN210167879U CN 210167879 U CN210167879 U CN 210167879U CN 201921269420 U CN201921269420 U CN 201921269420U CN 210167879 U CN210167879 U CN 210167879U
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Abstract
The utility model provides a copper shielding structure of a stator core end part of a steam turbine generator, belonging to the field of assembling steam turbine generators and stator core end parts, which comprises an inner shielding ring and an outer shielding ring which are used for carrying out magnetic shielding at one side of a stator pressing ring away from an iron core; the inner shielding ring comprises a first ring plate connected in an arc shape and a first cylindrical plate arranged on the outer ring of the first ring plate, and the outer shielding ring comprises a second ring plate connected in an arc shape and a second cylindrical plate arranged on the outer ring of the second ring plate; the inner shielding ring is used for being installed at a small-diameter corner of the stator pressing ring; the outer shielding ring is used for being installed at a large-diameter corner of the stator pressing ring. The segmented structure of the all-copper shielding ring structure is changed, the copper shielding rings are flexibly arranged, and the manufacturing and processing difficulty of the copper shielding is reduced while the magnetic leakage of the end coil is shielded; according to actual needs, a segmented copper shielding ring or a combined use structure of the segmented copper shielding ring and a magnetic shield can be flexibly adopted, and loss is reduced.
Description
Technical Field
The utility model relates to a turbo generator and stator core tip assembly field particularly, relates to a copper shield structure of turbo generator stator core tip.
Background
The leakage magnetic field at the end part of the stator coil of the large-scale turbonator is stronger, so that the loss of the accessories in the edge end iron core 1 and the structural member is increased, and the heating is serious. In order to improve the requirement that the tip generates heat and satisfies unit rated condition and advance looks operation mode, current operation unit mainly has two kinds of modes of shielding stator coil tip magnetic leakage field at present:
referring to fig. 1, the first stator clamping ring 2 is externally provided with an all-copper integral shielding ring 7: the copper integral shielding ring 7 adopts an integral ring structure and is arranged between the stator pressing ring 2 and the end coil. The copper integral shielding ring 7 is fixed on the stator clamping ring 2 through bolts along one or more corners in the radial direction.
Referring to fig. 2, the second type of technology, with the increase of capacity, is that a part of the large-capacity units adopts an all-copper integral shielding ring 7 plus magnetic shielding (or magnetic shunt) technology: according to the scheme, on the basis of the first scheme, the magnetic shielding sheet 6 formed by a section of silicon steel sheet is additionally arranged between the stator pressing ring 2 and the side end iron core 1 and is used as a supplement of the whole copper shielding ring 7, and the magnetic shielding sheet has a shunting effect on residual magnetic leakage.
The advantages of the above 2 schemes are: the copper shielding all adopts whole ring structure, can effectively shield most axial leakage magnetic flux that stator tip coil produced, reduces the loss of stator limit end iron core 1 and tip structure. The disadvantages are that: the copper shield is usually formed by welding a plurality of copper plates into a whole copper plate, and is formed for many times by an oil press through a special pressing die. The thickness of the copper plate is usually larger than or equal to 12mm, and the corner radius cannot be large due to the structural position limitation of the generator, so that the forming difficulty is large (the R/wall thickness is generally required to be larger than 3 by cold drawing). In the process of press forming, the R1 part often has a tension crack phenomenon, the quality of the upper surface is poor (the surface flatness is often ultra-poor, the subsequent shaping is difficult, and the subsequent component assembly is seriously influenced), the copper integral shielding ring 7 has a huge structure, the price of a single copper plate is high, and great economic loss is caused if the press forming is unsuccessful. In addition, if the whole copper shielding ring 7 has a plurality of corners, the forming difficulty is relatively high.
SUMMERY OF THE UTILITY MODEL
The utility model provides a copper-shielded structure of turbonator stator core tip aims at solving the above-mentioned problem that the copper-shielded structure of turbonator stator core tip exists among the prior art.
The utility model discloses a realize like this:
a copper shielding structure at the end part of a stator iron core of a steam turbine generator comprises an inner shielding ring and an outer shielding ring which are arranged on one side of a stator pressing ring far away from the iron core for magnetic shielding;
the inner shielding ring comprises a first ring plate connected in an arc shape and a first cylindrical plate arranged on the outer ring of the first ring plate, and the outer shielding ring comprises a second ring plate connected in an arc shape and a second cylindrical plate arranged on the outer ring of the second ring plate;
the inner shielding ring is used for being installed at a small-diameter corner of the stator pressing ring;
the outer shielding ring is used for being installed at a large-diameter corner of the stator pressing ring.
In an embodiment of the present invention, the utility model further comprises a connecting arc groove ring;
the inner diameter side of the connecting arc groove ring is connected with the inner shielding ring, and the outer diameter side of the connecting arc groove ring is connected with the outer shielding ring.
In an embodiment of the present invention, the first circular plate is provided with a first connecting hole at one end thereof, and the connecting arc groove ring is provided with a second connecting hole corresponding to the first connecting hole.
In an embodiment of the present invention, the second ring plate is far away from one end of the second cylindrical plate is provided with a third connecting hole, and a fourth connecting hole corresponding to the third connecting hole is provided on the connecting arc groove ring.
The utility model discloses an in one embodiment, still be provided with first mounting hole on the internal shield ring, be provided with on the stator clamping ring with the first screw hole that first mounting hole corresponds.
The utility model discloses an in one embodiment, still be provided with the second mounting hole on the outer shield ring, be provided with on the stator clamping ring with the second screw hole that the second mounting hole corresponds.
The utility model discloses an in the embodiment, still include the magnetism shielding piece, the magnetism shielding piece sets up the stator clamping ring is close to one side of iron core.
The utility model has the advantages that: through the copper shielding structure at the end part of the stator core of the turbonator, the structure of the full copper shielding ring is changed into a segmented structure, the copper shielding ring is flexibly arranged, and the manufacturing and processing difficulty of the copper shielding is reduced while the magnetic leakage of the coil at the end part is shielded; according to actual needs, a segmented copper shielding ring or a combined use structure of the segmented copper shielding ring and a magnetic shield can be flexibly adopted, so that the purposes of reducing the magnetic leakage of the side end iron core and the end structural part and reducing the loss of the side end iron core and the end structural part are achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a partial cross-sectional view of a copper shield at an end of a stator core of a prior art steam turbine generator;
FIG. 2 is a partial cross-sectional view of a prior art copper shield for a stator core end of a steam turbine generator with magnetic shield segments;
fig. 3 is a partial cross-sectional view of a copper shielding structure at an end of a stator core of a steam turbine generator according to an embodiment of the present invention;
fig. 4 is a partial cross-sectional view of a copper shielding structure at an end of a stator core of a steam turbine generator with a magnetic shielding plate according to an embodiment of the present invention;
fig. 5 is a partial cross-sectional view of a copper shielding structure at an end of a stator core of a steam turbine generator according to a second embodiment of the present invention;
fig. 6 is a partial cross-sectional view of a copper shielding structure at an end of a stator core of a steam turbine generator with a magnetic shielding plate according to an embodiment of the present invention.
Icon: 1-an iron core; 2-stator pressing ring; 3-an inner shield ring; 4-an outer shield ring; 5-connecting the arc groove ring; 6-magnetic shielding sheet; 7-integral shielding ring.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless otherwise expressly stated or limited, the first feature may comprise both the first and second features directly contacting each other, and also may comprise the first and second features not being directly contacting each other but being in contact with each other by means of further features between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.
Example one
Referring to fig. 3 and 4, the copper shielding structure of the stator core end of the steam turbine generator includes an inner shielding ring 3 and an outer shielding ring 4, which are arranged on one side of the stator pressing ring 2 away from the iron core 1 for magnetic shielding;
the inner shielding ring 3 comprises a first ring plate in arc connection and a first cylindrical plate arranged on the outer ring of the first ring plate, and the outer shielding ring 4 comprises a second ring plate in arc connection and a second cylindrical plate arranged on the outer ring of the second ring plate; the inner shielding ring 3 is used for being installed at the small-diameter corner of the stator pressing ring 2; the outer shield ring 4 is adapted to be mounted at a large diameter corner of the stator clamping ring 2.
The whole copper shielding structure and the manufacturing process thereof are simplified, the forming quality of the copper shielding is improved, and the production cost is reduced under the condition that the existing whole copper shielding is divided into the inner shielding ring 3 and the outer shielding ring 4 to ensure the magnetic leakage shielding effect of the copper shielding on the end part of the coil.
Still be provided with first mounting hole on the inner shield ring 3, be provided with the first screw hole that corresponds with first mounting hole on the stator clamping ring 2. The inner shielding ring 3 is fixed on the stator pressing ring 2 through the bolt passing through the first mounting hole and matching with the first threaded hole.
And a second mounting hole is also formed in the outer shielding ring 4, and a second threaded hole corresponding to the second mounting hole is formed in the stator pressing ring 2. The outer shielding ring 4 is fixed on the stator pressing ring 2 through the bolt passing through the second mounting hole and matching with the second threaded hole.
The outer shielding ring 4 and the inner shielding ring 3 can be selectively installed according to the shielding strength, and one shielding ring can be installed independently under the condition that the shielding requirement can be met by independently using the outer shielding ring 4 or the inner shielding ring 3.
In this embodiment, still include magnetism shielding sheet 6, magnetism shielding sheet 6 is the silicon steel sheet, and magnetism shielding sheet 6 sets up in the stator clamping ring 2 and is close to one side of iron core 1, and magnetism shielding sheet 6 plays the reposition of redundant personnel effect as the replenishment of shielding ring to remaining leakage. In other embodiments, the magnetic shield sheet 6 may not be added.
Through the copper shielding structure at the end part of the stator core of the turbonator, the structure of the full copper shielding ring is changed into a segmented structure, the copper shielding ring is flexibly arranged, and the manufacturing and processing difficulty of the copper shielding is reduced while the magnetic leakage of the coil at the end part is shielded; according to actual needs, a segmented copper shielding ring or a combined use structure of the segmented copper shielding ring and a magnetic shield can be flexibly adopted, so that the purposes of reducing the magnetic leakage of the side end iron core 1 and the end structural member and reducing the loss of the side end iron core and the end structural member are achieved.
Example two
The embodiment provides a copper shielding structure of a stator core end of a turbo generator, please refer to fig. 5 and 6, the copper shielding structure of the stator core end of the turbo generator comprises an inner shielding ring 3 and an outer shielding ring 4, which are arranged on one side of a stator pressing ring 2 far away from an iron core 1 for magnetic shielding;
the inner shielding ring 3 comprises a first ring plate in arc connection and a first cylindrical plate arranged on the outer ring of the first ring plate, and the outer shielding ring 4 comprises a second ring plate in arc connection and a second cylindrical plate arranged on the outer ring of the second ring plate; the inner shielding ring 3 is used for being installed at the small-diameter corner of the stator pressing ring 2; the outer shield ring 4 is adapted to be mounted at a large diameter corner of the stator clamping ring 2.
The whole copper shielding structure and the manufacturing process thereof are simplified, the forming quality of the copper shielding is improved, and the production cost is reduced under the condition that the existing whole copper shielding is divided into the inner shielding ring 3 and the outer shielding ring 4 to ensure the magnetic leakage shielding effect of the copper shielding on the end part of the coil.
Because the inner shielding ring 3 and the outer shielding ring 4 are both used at the external corner of the stator pressing ring 2, and the internal corner of the stator pressing ring 2 is not wrapped by the shielding rings. In this embodiment, therefore, a connecting arc groove ring 5 is also provided; the inner diameter side of the connecting arc groove ring 5 is connected with the inner shielding ring 3, and the outer diameter side is connected with the outer shielding ring 4.
Specifically, the end, far away from the first ring plate, of the first cylinder plate is provided with a first connecting hole, a second connecting hole corresponding to the first connecting hole is formed in the connecting arc groove ring 5, and the bolt penetrates through the first connecting hole and the second connecting hole to achieve connection. One end of the second ring plate, which is far away from the second cylindrical plate, is provided with a third connecting hole, a fourth connecting hole corresponding to the third connecting hole is formed in the connecting arc groove ring 5, and the bolt penetrates through the third connecting hole and the fourth connecting hole to be connected.
Still be provided with first mounting hole on the inner shield ring 3, be provided with the first screw hole that corresponds with first mounting hole on the stator clamping ring 2. The inner shielding ring 3 is fixed on the stator pressing ring 2 through the bolt passing through the first mounting hole and matching with the first threaded hole.
And a second mounting hole is also formed in the outer shielding ring 4, and a second threaded hole corresponding to the second mounting hole is formed in the stator pressing ring 2. The outer shielding ring 4 is fixed on the stator pressing ring 2 through the bolt passing through the second mounting hole and matching with the second threaded hole.
The outer shielding ring 4 and the inner shielding ring 3 can be selectively installed according to the shielding strength, and one shielding ring can be installed independently under the condition that the shielding requirement can be met by independently using the outer shielding ring 4 or the inner shielding ring 3.
In this embodiment, still include magnetism shielding sheet 6, magnetism shielding sheet 6 is the silicon steel sheet, and magnetism shielding sheet 6 sets up in the stator clamping ring 2 and is close to one side of iron core 1, and magnetism shielding sheet 6 plays the reposition of redundant personnel effect as the replenishment of shielding ring to remaining leakage. In other embodiments, the magnetic shield sheet 6 may not be added.
Through the copper shielding structure at the end part of the stator core of the turbonator, the structure of the full copper shielding ring is changed into a segmented structure, the copper shielding ring is flexibly arranged, and the manufacturing and processing difficulty of the copper shielding is reduced while the magnetic leakage of the coil at the end part is shielded; according to actual needs, a segmented copper shielding ring or a combined use structure of the segmented copper shielding ring and a magnetic shield can be flexibly adopted, so that the purposes of reducing the magnetic leakage of the side end iron core 1 and the end structural member and reducing the loss of the side end iron core and the end structural member are achieved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A copper shielding structure at the end part of a stator iron core of a steam turbine generator is characterized by comprising an inner shielding ring and an outer shielding ring which are arranged on one side of a stator pressing ring far away from the iron core for magnetic shielding;
the inner shielding ring comprises a first ring plate connected in an arc shape and a first cylindrical plate arranged on the outer ring of the first ring plate, and the outer shielding ring comprises a second ring plate connected in an arc shape and a second cylindrical plate arranged on the outer ring of the second ring plate;
the inner shielding ring is used for being installed at a small-diameter corner of the stator pressing ring;
the outer shielding ring is used for being installed at a large-diameter corner of the stator pressing ring.
2. The copper shielding structure of the end of the stator core of the steam turbine generator as claimed in claim 1, further comprising a connecting arc slot ring;
the inner diameter side of the connecting arc groove ring is connected with the inner shielding ring, and the outer diameter side of the connecting arc groove ring is connected with the outer shielding ring.
3. The copper shielding structure of the end of the stator core of the steam turbine generator as claimed in claim 2, wherein a first connection hole is formed at an end of the first cylindrical plate away from the first ring plate, and a second connection hole corresponding to the first connection hole is formed in the connection arc groove ring.
4. The copper shielding structure at the end part of the stator core of the steam turbine generator as claimed in claim 2, wherein a third connection hole is formed at one end of the second ring plate away from the second cylindrical plate, and a fourth connection hole corresponding to the third connection hole is formed in the connection arc groove ring.
5. The copper shielding structure at the end part of the stator core of the steam turbine generator as claimed in claim 1, wherein the inner shielding ring is further provided with a first mounting hole, and the stator pressing ring is provided with a first threaded hole corresponding to the first mounting hole.
6. The copper shielding structure at the end part of the stator core of the steam turbine generator as claimed in claim 1, wherein the outer shielding ring is further provided with a second mounting hole, and the stator pressing ring is provided with a second threaded hole corresponding to the second mounting hole.
7. The copper shielding structure for the end part of the stator core of the steam turbine generator as claimed in claim 1, further comprising a magnetic shielding sheet, wherein the magnetic shielding sheet is arranged on one side of the stator pressing ring close to the core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921269420.4U CN210167879U (en) | 2019-08-07 | 2019-08-07 | Copper shielding structure of stator core end of steam turbine generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921269420.4U CN210167879U (en) | 2019-08-07 | 2019-08-07 | Copper shielding structure of stator core end of steam turbine generator |
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| Publication Number | Publication Date |
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| CN210167879U true CN210167879U (en) | 2020-03-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921269420.4U Active CN210167879U (en) | 2019-08-07 | 2019-08-07 | Copper shielding structure of stator core end of steam turbine generator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116131536A (en) * | 2023-04-19 | 2023-05-16 | 哈尔滨电机厂有限责任公司 | Stator end variable cross-section combined shielding structure |
-
2019
- 2019-08-07 CN CN201921269420.4U patent/CN210167879U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116131536A (en) * | 2023-04-19 | 2023-05-16 | 哈尔滨电机厂有限责任公司 | Stator end variable cross-section combined shielding structure |
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