CN112701861B - Method for disassembling and assembling blade type high-pressure fan of steam turbine generator - Google Patents
Method for disassembling and assembling blade type high-pressure fan of steam turbine generator Download PDFInfo
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- CN112701861B CN112701861B CN202011413767.9A CN202011413767A CN112701861B CN 112701861 B CN112701861 B CN 112701861B CN 202011413767 A CN202011413767 A CN 202011413767A CN 112701861 B CN112701861 B CN 112701861B
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Abstract
The invention belongs to the technical field of maintenance of a steam turbine generator, and particularly relates to a method for disassembling and assembling a blade type high-pressure fan of the steam turbine generator. The method for disassembling the vane type high-pressure fan of the steam turbine generator comprises the following steps: removing the upper fan cover; installing a fan cover dismounting ring and a sliding gasket; rotating the residual fan cover clockwise to enable the left-petal fan cover, the lower-petal fan cover and the right-petal fan cover to be arranged right above and detached in sequence; dismantling the special tool; and (4) dismantling all the movable fan blades. The method for installing the vane type high-pressure fan of the steam turbine generator comprises the following steps: mounting all movable fan blades; installing a fan cover dismounting ring and a sliding gasket; a left valve fan cover, a lower valve fan cover and a right valve fan cover are sequentially arranged right above the fan cover, and each fan cover is arranged and rotates 90 degrees clockwise; dismantling the special tool; an upper petal fan cover is arranged right above the upper petal fan cover. The method can simplify the dismounting operation process of the blade type high-pressure fan and effectively improve the dismounting efficiency of the high-pressure fan.
Description
Technical Field
The invention belongs to the technical field of maintenance of a steam turbine generator, and particularly relates to a method for disassembling and assembling a blade type high-pressure fan of the steam turbine generator.
Background
At present, high-pressure fans are used in internal cooling systems of turbonators at home and abroad as power sources for internal cooling of the turbonators, so that a cooling medium in the turbonators generates high pressure, the internal circulating cooling function of the internal cooling system of the turbonators is realized, the cooling medium is driven to cool parts such as a stator winding, a stator core, a rotor winding and a rotor core of the turbonator, and the normal operation of the turbonators is guaranteed. The high-pressure fan is composed of a certain number of movable fan blades and four-segment high-pressure fan covers on a fan seat ring, and comprises an upper segment fan cover, a right segment fan cover, a lower segment fan cover and a left segment fan cover, wherein each segment of high-pressure fan cover is provided with a certain number of static fan blades. When the turbonator normally operates, the movable blades rotate together with the generator rotor and drive the cooling medium together with the static blades on the high-pressure fan cover, so that the cooling medium generates high pressure to realize the internal circulating cooling function of the generator.
However, in the actual maintenance process of the steam turbine generator, there are many problems in the current assembling and disassembling process of the high-pressure fan, including:
(1) because the clearance between the fan cover of the high-pressure fan and the fan seat ring is small, when a special tool for turning the fan cover is put in, the special tool can be put in only after being adjusted for many times by other auxiliary tools, and 2 fan cover dismounting rings need to be installed, so that the installation time is long, and the maintenance efficiency of the turbonator is low;
(2) the generator rotor needs to be turned for many times in the process of dismounting the high-pressure fan, so that great mechanical injury risks of maintainers and damage risks of important parts, such as movable fan blades and static fan blades, exist;
(3) the rotor of the disc-driven generator can be operated only by using a crane of a steam turbine plant, the overhaul period belongs to an overhaul main line of the steam turbine plant, the overhaul efficiency of a steam turbine generator unit is low, and the overhaul period is seriously prolonged;
(4) the generator rotor moves fan blade quantity many, all adopts in the dismouting in-process at present to divide into the dismouting of basic unit with 1/4, has the risk that higher foreign matter falls into in the high pressure fan among the dismouting process.
Therefore, it is highly desirable to develop a method for assembling and disassembling a vane type high-pressure fan of a turbo generator, which can effectively improve the assembling and disassembling efficiency of the high-pressure fan and reduce the safety risks of personnel mechanical injury, important equipment damage, and foreign matters falling into the high-pressure fan.
Disclosure of Invention
The invention aims to provide a method for dismounting a vane type high-pressure fan of a steam turbine generator, which can simplify the dismounting operation process of the vane type high-pressure fan, realize the quick dismounting of the high-pressure fan, effectively improve the dismounting efficiency of the high-pressure fan, shorten the overhaul period of the steam turbine generator unit, effectively reduce various safety risks such as personnel mechanical injury, important equipment damage and foreign matter falling in, and ensure the overhaul quality of the steam turbine generator unit.
The technical scheme for realizing the purpose of the invention is as follows:
a method for disassembling a vane type high-pressure fan of a steam turbine generator, comprising the following steps:
step (A1), removing the upper fan cover;
step (A2), mounting a fan cover dismounting ring and a sliding gasket;
step (A3), clockwise rotating the residual fan cover, and sequentially placing the left-petal fan cover, the lower-petal fan cover and the right-petal fan cover right above and removing;
step (A4), dismantling the special tool;
and (A5) removing all the movable fan blades.
In the step (a2), the number of the fan cover dismounting rings is 1, and the mounting position is the tail of the high-pressure fan cover.
In the step (a2), a sliding gasket is installed in a gap between the high-pressure fan cover radial limiting block and the fan seat ring for reducing friction force of the sliding part.
The step (a3) includes:
step (A3.1), the residual fan cover is rotated clockwise, so that the left fan cover is arranged right above and is removed;
step (A3.2), the residual fan cover is rotated clockwise, so that the lower fan cover is arranged right above and is removed;
and (A3.3) rotating the right fan cover clockwise to enable the right fan cover to be placed right above and detached.
A method for installing a vane type high-pressure fan of a steam turbine generator, comprising the following steps:
step (B1), mounting all the movable fan blades;
step (B2), mounting a fan cover dismounting ring and a sliding gasket;
step (B3), sequentially installing a left-lobe fan cover, a lower-lobe fan cover and a right-lobe fan cover right above, and rotating 90 degrees clockwise when installing one fan cover;
step (B4), dismantling the special tool;
and (B5) installing an upper fan cover right above.
In the step (B2), the number of the fan cover dismounting rings is 1, and the mounting position is the tail of the high-pressure fan cover.
In the step (B2), the sliding gasket is installed in the gap between the radial limit block of the high-pressure fan cover and the fan seat ring to reduce the friction force of the sliding part.
The step (B3) includes:
step (B3.1), installing a left fan cover right above and rotating clockwise for 90 degrees;
step (B3.2), installing a lower fan cover right above and rotating 90 degrees clockwise;
and (B3.3) installing a right valve fan cover right above and rotating by 90 degrees clockwise.
The invention has the beneficial technical effects that:
1. according to the method for dismounting the vane type high-pressure fan of the turbonator, the structural characteristics of the fan seat ring of the turbonator are fully utilized, under the condition that the rotor of the turbonator does not need to be turned, independent dismounting work of 4 high-pressure fan covers and all movable fan blades 9 is realized, the work flow is greatly simplified, and the safety risk that personnel are subjected to mechanical injury in the turning process of the rotor is effectively reduced;
2. according to the method for dismounting the blade type high-pressure fan of the turbonator, the movable blade of the high-pressure fan is completely independent of the dismounting of the fan cover, so that the larger dismounting operation space of a maintainer is greatly enlarged, the dismounting quality of the movable blade and accessories of the movable blade is effectively ensured, the risks of damage to important parts and falling of foreign matters are greatly reduced, and the overhauling quality of the turbonator can be effectively ensured;
3. the method for dismounting the blade type high-pressure fan of the steam turbine generator effectively shortens the dismounting time of a special tool, greatly shortens the occupied time of a travelling crane of a steam turbine plant, practically improves the overhauling efficiency of the steam turbine generator unit, and shortens the overhaul period;
4. the method for dismounting the vane type high-pressure fan of the steam turbine generator is suitable for dismounting high-pressure fans of various types of steam turbine generators and can realize quick dismounting of the vane type high-pressure fan.
Drawings
FIG. 1 is a schematic view of a method for assembling and disassembling a vane type high pressure fan of a steam turbine generator according to the present invention;
FIG. 2 is an enlarged view of a portion of area A of FIG. 1;
FIG. 3 is a schematic structural view of a high pressure fan casing;
FIG. 4 is a schematic view of a prior art method for assembling and disassembling a vane type high pressure fan of a steam turbine generator;
in the figure: 4. a high pressure fan housing; 5. a static fan blade; 6. disassembling and assembling the ring; 7. a rotor large shaft; 8. a fan seat ring; 9. a movable fan blade; 10. a sliding gasket; 11. a radial limiting block; 41. an upper lobe fan housing; 42. a right lobe fan housing; 43. a lower fan casing; 44. left lobe fan housing.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1-3, the present invention provides a method for disassembling a vane type high-pressure fan of a steam turbine generator, the method comprising the following steps:
step (a1), removing the upper flap fan cover 41;
step (A2), installing 1 fan cover dismounting ring 6 at the tail part of the high-pressure fan cover 4, and installing a sliding gasket 10 in a gap between a radial limited block 11 of the high-pressure fan cover and a fan seat ring 8 for reducing the friction force of a sliding part;
step (a3), clockwise rotating the remaining fan cover, and sequentially placing and removing the left fan cover 44, the lower fan cover 43 and the right fan cover 42 right above;
step (A3.1), clockwise rotating the remaining 3 fan housings to enable the left fan housing 44 to be arranged right above and detached;
step (A3.2), clockwise rotating the residual 2 fan covers to enable the lower fan cover 43 to be arranged right above and detached;
step (A3.3), clockwise rotating the right valve fan cover 42 to enable the right valve fan cover to be arranged right above and detached;
step (A4), dismantling the special tool;
and (A5) removing all the movable fan blades 9.
The embodiment utilizes the gap between the radial limited block 11 of the high-pressure fan cover and the fan seat ring 8, and the gap between the static fan blade 5 and the fan seat ring 8 is smaller, and the radial limited block 11 of the head part of the fan cover is used as a sliding supporting point of the fan cover, and a sliding gasket 10 is additionally arranged between the sliding supporting point and the sliding supporting point, so that the friction force of the sliding part is reduced. In addition, only the 1-piece dismounting ring 6 is installed at the tail part of the high-pressure fan cover 4, and the mounting of the dismounting ring is very simple and convenient because the tail part area of the high-pressure fan cover 4 has no moving and static wind blades. Through the implementation of the measures, under the condition that the movable fan blades on the rotor are not removed, auxiliary tools such as the chain block are used in the turbo generator in a matched mode, the high-pressure fan cover 4 can slide on the rotor fan seat ring 8 in the circumferential direction by means of the sliding gasket 10 and the dismounting ring 6, the left fan cover 44, the lower fan cover 43 and the right fan cover 42 slide to the position of the upper fan cover 41 in the clockwise direction by means of the traction of the chain block, and therefore the four fan covers are removed gradually. And finally, all the movable fan blades 9 are extremely conveniently dismounted without the rotor of the turbine generator being driven, so that the mode can avoid great mechanical injury of personnel caused by the driving of the rotor and prevent foreign matters from falling into the space between the movable fan blades and the static fan blades.
Example 2
As shown in fig. 1-3, the present invention provides a method for installing a vane type high-pressure fan of a steam turbine generator, the method comprising the following steps:
step (B1), mounting all the movable fan blades 9;
step (B2), installing 1 fan cover dismounting ring 6 at the tail part of the high-pressure fan cover 4, and installing a sliding gasket 10 in a gap between a radial limiting block 11 of the high-pressure fan cover and a fan seat ring 8 for reducing the friction force of a sliding part;
step (B3), sequentially mounting the left-lobe fan cover 44, the lower-lobe fan cover 43 and the right-lobe fan cover 42 right above, and rotating 90 degrees clockwise every time one fan cover is mounted;
step (B3.1), installing a left valve fan cover 44 right above and rotating 90 degrees clockwise;
step (B3.2), installing a lower fan cover 43 right above and rotating 90 degrees clockwise;
step (B3.3), installing the right valve fan cover 42 right above and rotating 90 degrees clockwise;
step (B4), dismantling the special tool;
and (B5) mounting the upper flap fan cover 41 directly above.
When the high-pressure fan is reassembled, all the movable fan blades 9 are quickly and efficiently installed under the condition that the rotor of the steam turbine generator is not required to be coiled, the cleaning work of all the movable fan blades 9 is well done, the operation space of the reassembly process personnel is large, and the installation quality can be effectively guaranteed. The installation has more spare part that easily forms the foreign matter, under the prerequisite of not installing high-pressure fan cover 4, can effectively reduce the foreign matter of repacking in-process and fall into the risk.
In addition, although the structural style of each high-pressure fan of the turbonator has slight difference, the structure of the high-pressure fan part is designed with a radial limiting block, and the design clearance of the part is smaller than the clearance between the static fan blade and the fan seat ring. Therefore, the method for assembling and disassembling the vane type high-pressure fan of the steam turbine generator is suitable for assembling and disassembling high-pressure fans of various types of steam turbine generators, and can realize quick assembling and disassembling of the vane type high-pressure fan.
Comparative example 1
As shown in fig. 4, the method for disassembling the vane type high-pressure fan of the steam turbine generator in the prior art comprises the following steps:
step (C1), removing the upper flap fan cover 41;
step (C2), the movable fan blades 9 are removed one by 4 times of disk-moving rotors;
step (C3), installing 2 fan cover dismounting rings 6;
step (C4), rotating the remaining fan cover, and sequentially placing the right-lobe fan cover 42, the lower-lobe fan cover 43, and the left-lobe fan cover 44 right above and removing them;
step (C4.1), integrally rotating the residual 3 fan housings to enable the right fan housing 42 to be arranged right above and detached;
step (C4.2), continuing to rotate the residual 2 fan covers to enable the lower fan cover 43 to be arranged right above and detached;
step (C4.3), continuing to rotate the residual 1-segment fan cover to enable the left-segment fan cover 44 to be arranged right above and detached;
and step (C5), removing the special tool.
Comparative example 2
As shown in fig. 4, the method for installing the vane type high-pressure fan of the steam turbine generator in the prior art comprises the following steps:
step (D1), installing 2 fan cover dismounting rings 6;
step (D2), sequentially mounting the left-lobe fan cover 44, the lower-lobe fan cover 43, and the right-lobe fan cover 42 right above, and rotating 90 ° clockwise every time one fan cover is mounted;
step (D2.1), installing a left-lobe fan cover 44 right above and rotating 90 degrees clockwise;
step (D2.2), installing a lower fan cover 43 right above and rotating 90 degrees clockwise;
step (D2.3), installing the right lobe fan cover 42 right above and rotating 90 degrees clockwise;
step (D3), mounting the movable fan blades 9 on the 8-time disk-moving rotor one by one;
and (D4) mounting the upper flap fan cover 41.
According to the comparative example, in the prior art, the generator rotor needs to be turned for many times in the dismounting process of the high-pressure fan, so that the dismounting efficiency of the high-pressure fan is low, the risk of mechanical injury of great maintainers and important parts, such as movable fan blades and static fan blades, exists, and the risk that high foreign matters fall into the high-pressure fan exists in the dismounting process.
The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The prior art can be adopted in the content which is not described in detail in the invention.
Claims (4)
1. A method for disassembling a vane type high-pressure fan of a steam turbine generator is characterized by comprising the following steps:
step (A1), removing the upper fan cover (41);
step (A2), installing a fan cover dismounting ring (6) and a sliding gasket (10);
step (A3), clockwise rotating the residual fan cover, and sequentially placing the left-petal fan cover (44), the lower-petal fan cover (43) and the right-petal fan cover (42) right above and removing;
step (A4), dismantling the special tool;
step (A5), dismantling all the movable fan blades (9);
in the step (A2), the mounting number of the fan cover dismounting ring (6) is 1, and the mounting position is the tail part of the high-pressure fan cover (4);
in the step (A2), the sliding gasket (10) is installed in a gap between the radial limited block (11) of the high-pressure fan cover and the fan seat ring (8) and used for reducing the friction force of the sliding part.
2. The method for disassembling a vane type high-pressure fan of a steam turbine generator as claimed in claim 1, wherein the step (A3) comprises:
step (A3.1), the residual fan cover is rotated clockwise, so that the left fan cover (44) is arranged right above and is removed;
step (A3.2), the residual fan cover is rotated clockwise, so that the lower fan cover (43) is arranged right above and is detached;
and (A3.3) rotating the right fan cover (42) clockwise to enable the right fan cover to be placed right above and detached.
3. A method for installing a vane type high-pressure fan of a steam turbine generator is characterized by comprising the following steps:
step (B1), mounting all the movable fan blades (9);
step (B2), installing a fan cover dismounting ring (6) and a sliding gasket (10);
step (B3), sequentially installing a left-lobe fan cover (44), a lower-lobe fan cover (43) and a right-lobe fan cover (42) right above, and rotating 90 degrees clockwise when installing one fan cover;
step (B4), dismantling the special tool;
a step (B5) of mounting an upper flap fan cover (41) directly above;
in the step (B2), the mounting number of the fan cover dismounting ring (6) is 1, and the mounting position is the tail part of the high-pressure fan cover (4);
in the step (B2), the sliding gasket (10) is installed in the gap between the radial limited block (11) of the high-pressure fan cover and the fan seat ring (8) and used for reducing the friction force of the sliding part.
4. The method for installing a vane type high-pressure fan of a steam turbine generator as claimed in claim 3, wherein the step (B3) comprises:
step (B3.1), installing a left valve fan cover (44) right above and rotating 90 degrees clockwise;
step (B3.2), installing a lower fan cover (43) right above and rotating 90 degrees clockwise;
and (B3.3) installing a right valve fan cover (42) right above and rotating 90 degrees clockwise.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011413767.9A CN112701861B (en) | 2020-12-04 | 2020-12-04 | Method for disassembling and assembling blade type high-pressure fan of steam turbine generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011413767.9A CN112701861B (en) | 2020-12-04 | 2020-12-04 | Method for disassembling and assembling blade type high-pressure fan of steam turbine generator |
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| CN112701861A CN112701861A (en) | 2021-04-23 |
| CN112701861B true CN112701861B (en) | 2021-11-09 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202231518U (en) * | 2011-10-27 | 2012-05-23 | 山东齐鲁电机制造有限公司 | Novel inducer fixing device for turbonator |
| WO2012065613A1 (en) * | 2010-11-18 | 2012-05-24 | Vestas Wind Systems A/S | Method for craneless wind turbine blade handling via a turbine hub |
| CN102966382A (en) * | 2012-11-30 | 2013-03-13 | 上海电气电站设备有限公司 | Stator blade assembly method for steam turbine generator |
| CN104377899A (en) * | 2014-11-17 | 2015-02-25 | 大唐保定热电厂 | Turbonator disassembling and assembling system |
| CN205921508U (en) * | 2016-06-12 | 2017-02-01 | 哈尔滨电机厂有限责任公司 | Turbo generator rotor ring class piece extracting tool |
| CN211908592U (en) * | 2020-02-28 | 2020-11-10 | 阳江核电有限公司 | Nuclear power generator static blade seat assembly and disassembly tools |
-
2020
- 2020-12-04 CN CN202011413767.9A patent/CN112701861B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012065613A1 (en) * | 2010-11-18 | 2012-05-24 | Vestas Wind Systems A/S | Method for craneless wind turbine blade handling via a turbine hub |
| CN103403344A (en) * | 2010-11-18 | 2013-11-20 | 维斯塔斯风力系统有限公司 | Method for craneless wind turbine blade handling via a turbine hub |
| CN202231518U (en) * | 2011-10-27 | 2012-05-23 | 山东齐鲁电机制造有限公司 | Novel inducer fixing device for turbonator |
| CN102966382A (en) * | 2012-11-30 | 2013-03-13 | 上海电气电站设备有限公司 | Stator blade assembly method for steam turbine generator |
| CN104377899A (en) * | 2014-11-17 | 2015-02-25 | 大唐保定热电厂 | Turbonator disassembling and assembling system |
| CN205921508U (en) * | 2016-06-12 | 2017-02-01 | 哈尔滨电机厂有限责任公司 | Turbo generator rotor ring class piece extracting tool |
| CN211908592U (en) * | 2020-02-28 | 2020-11-10 | 阳江核电有限公司 | Nuclear power generator static blade seat assembly and disassembly tools |
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