Novel pulley rotor assembling and pulling method for distributed phase modifier

Abstract

The invention relates to the field of steam turbine generators, and discloses a novel pulley rotor installing and pulling method for a distributed phase modifier, which comprises a position I rotor lifting stage, a position II shaft diameter pulley in-position stage, a position III rotor body axial advancing stage in a stator chamber, and a position IV rotor body axial advancing stage outside the stator chamber. According to the method, rotor installation and extraction can be completed without cooperation of a joist barrow, the problems that the cost is high and the occupied space is large when the joist barrow is used for hoisting and extracting the rotor are solved, operation is easy, efficiency is high, cost is low, and the site construction period is effectively shortened.

Description

Technical Field

[0001] The invention relates to the field of steam turbine generators, and in particular to a novel pulley rotor installation and extraction method for distributed phase regulators. Background Art

[0002] In recent years, in order to achieve "carbon peak" and "carbon neutrality", promote the green transformation of economic structure, and adapt to the needs of new power systems, more high-proportion renewable energy sources such as wind power and photovoltaics have been connected to the power grid, and asynchronous power sources have gradually become the main body of new power systems. Compared with the stable voltage characteristics of traditional energy grids, new energy has the characteristics of low inertia support capacity, weak frequency and voltage regulation capabilities, and uncontrollable intermittent and fluctuating loads. With the increase in the proportion of new energy, the stability of the power system faces severe challenges.

[0003] As a type of synchronous motor, distributed phase condensers can not only provide short-circuit capacity and inertia for the system, but also have good reactive output characteristics. They play an irreplaceable supporting role in the stable operation of the power grid. In recent years, various new energy sites have had a strong demand for the configuration of distributed phase condensers. With the commissioning of batches of phase condenser units, distributed phase condensers have gradually become a generally recognized technical solution that can effectively solve the problem of new energy consumption in new power systems, and their application prospects are very promising.

[0004] During the installation and overhaul of traditional steam turbine generators and phase-converting units, rotor installation and extraction operations are required. Gantry cranes are generally used for rotor installation and extraction. The tonnage requirements of the gantry cranes range from tens of tons to hundreds of tons according to the unit capacity and rotor weight. Distributed phase-converting units are affected by factors such as tight construction period, limited site space, and cost control. Usually, the phase-converting units are installed in prefabricated cabins. The use of prefabricated cabins can greatly save the cost and period of factory construction, but they cannot be equipped with gantry crane lifting equipment, which has an adverse effect on the operation, maintenance and inspection of distributed phase-converting units, and especially poses new challenges to the on-site installation and extraction of rotors. Summary of the invention

[0005] In view of this, the purpose of the present invention is to disclose a new pulley method for installing and withdrawing rotors for distributed phase-shifting machines. This method can complete the installation and withdrawal of rotors without the cooperation of a gantry truck, solving the problem that the cost of using a gantry truck to lift and withdraw rotors in distributed phase-shifting machines is high and occupies a large area. This method occupies a small space, is simple to operate, is highly efficient, and has a low cost, effectively shortening the on-site construction period.

[0006] The technical solution of the present invention is: a novel pulley installation and extraction rotor method for a distributed phase regulator, the steps comprising:

[0007] S1. Position I rotor lifting stage;

[0008] S2. Position II shaft diameter pulley in place stage;

[0009] S3. Position III: The rotor body is in the axial movement stage in the stator bore;

[0010] S4. Position IV: The rotor body is in the axial movement stage outside the stator bore;

[0011] S5. Position V, the main body pulley is in place;

[0012] S6. Position VI is the final stage of rotor extraction.

[0013] The present invention can realize the complete process of installing and withdrawing the rotor without the aid of a gantry lifting device. The rotor is guided and positioned by a pulley, and the weight of the rotor is reasonably distributed to ensure that the rotor is reliably supported throughout the entire process, fully utilize the stator space, avoid collision between the stator and the rotor, save costs, save time, save labor, and efficiently complete the installation and withdrawal of the rotor.

[0014] During the rotor lifting stage at position I, the sound insulation cover brush holder, air seal ring and large end cover are removed before pulling out the rotor to expose the stator base end plate, and rotor lifting tools are installed on the end plates on both sides of the stator base at position I. After ensuring that the lifting tools on both sides evenly carry the rotor, the bearings on both sides are removed, and the rotor lifting tools on both sides are adjusted to make the rotor horizontal and lifted vertically upward. During the lifting process, the air gap at the top of the stator and rotor gradually decreases, and the air gap at the bottom gradually increases. Always pay attention to avoid collision between the stator and rotor. Stop lifting when the air gap at the bottom is ready for installing the main body slider, install the core protection tool, slide plate and main body slider on the stator core, install the axial traction tool at the rotor end, and install the ground anchor at the construction site to complete the rotor lifting work.

[0015] In the position II shaft diameter pulley placement stage, after completing the rotor lifting work, install the pulley device at the shaft diameter position of the outgoing line end, install the slider tool at the non-outgoing line end, adjust the rotor lifting tool, slowly lower the rotor, so that the weight of the rotor is completely supported by the main body slider and the shaft diameter pulley, disassemble the rotor lifting tool until it does not affect the axial movement of the rotor, and complete the position II shaft diameter pulley placement stage.

[0016] In the described position III, the rotor body is in the axial moving stage in the stator bore, ensuring that the axial load of the rotor is uniform and stable, gradually pulling the rotor to move out of the stator bore, and the body slider synchronously adjusts its position to move forward in coordination. The weight of the rotor is supported by the body slider and the shaft diameter pulley, and gradually moves along the axial direction of the rotor. Further, the non-outgoing end slider enters the stator bore, the body slider slides out of the stator and naturally falls onto the core protection tool. The weight of the rotor is supported by the non-outgoing end slider and the shaft diameter pulley to continue to move axially, completing the position IV rotor body axial moving stage outside the stator bore.

[0017] During the axial movement stage of the rotor body at position V outside the stator bore, when the non-line-outlet end slider approaches the stator end, the traction is stopped, a body pulley is installed under the rotor body, and the rotor is continued to be pulled until the rotor end face is exposed from the stator. After the body pulley is fixed, the site is cleaned, and the slide plate and other rotor extraction tools are removed to complete the final stage of rotor extraction at position VI. The rotor can be installed by following the reverse steps above. This method does not require a gantry truck to realize rotor installation and extraction, and the installation and extraction process is simple, which greatly saves the cost of plant construction, and saves the cost of gantry truck configuration and operation and maintenance.

[0018] The beneficial effects of the present invention are:

[0019] 1. The present invention realizes the axial movement of the rotor during the installation and withdrawal of the rotor of the distributed phase-shifting machine through the rotor lifting tool, the slider and the pulley. The rotor is reliably supported during the entire installation and withdrawal process, and the installation and withdrawal process does not require the aid of a gantry truck, which is simple, convenient, safe and reliable to operate.

[0020] 2. The present invention enables each distributed phase adjustment field station to optimize the prefabricated cabin construction mode, without the need to configure a gantry vehicle, greatly saving the cost and cycle of plant construction, and achieving significant economic benefits.

[0021] 3. The present invention can effectively solve the maintenance problems of installing and removing rotors at sites where the gantry crane fails and the rotor cannot be installed or removed, and can meet the maintenance cycle. The related installation tools and facilities are relatively small in size, so the present invention can be further promoted and can adapt to more diverse work scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a framework flow chart of a new pulley installation and extraction rotor method for distributed phase regulator;

[0023] Figure 2 This is a schematic diagram of the rotor lifting stage in position I;

[0024] Figure 3 This is a schematic diagram of the position II shaft diameter pulley in position stage;

[0025] Figure 4 It is a schematic diagram of the axial movement stage of the rotor body in the stator bore at position III;

[0026] Figure 5 It is a schematic diagram of the axial movement stage of the rotor body outside the stator bore at position IV;

[0027] Figure 6 This is a schematic diagram of the stage where the main body pulley is in position V;

[0028] Figure 7 This is a schematic diagram of the final stage of rotor extraction in position VI. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solution of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] like Figure 1 , 2 As shown, a new pulley installation and extraction method for distributed phase regulators includes the following steps: rotor lifting stage at position I, shaft pulley positioning stage at position II, axial movement stage of the rotor body in the stator bore at position III, axial movement stage of the rotor body outside the stator bore at position IV, body pulley positioning stage at position V, and rotor extraction finalization stage at position VI. In rotor lifting stage 1 at position I, the brush holder of the soundproof cover, the air sealing ring, and the large end cover are removed before the rotor is extracted to expose the stator base end plate, and the rotor lifting tool is installed on the end plates on both sides of the stator base at position I. , after ensuring that the lifting tools on both sides evenly load the rotor, remove the bearings on both sides, adjust the rotor lifting tools on both sides, make the rotor horizontal and lift vertically upward. During the lifting process, the air gap at the top of the stator and rotor gradually decreases, and the air gap at the bottom gradually increases. Always pay attention to avoid collision between the stator and rotor. When the air gap at the bottom has the conditions for installing the main body slider, stop lifting, install the core protection tool, slide plate and main body slider on the stator core, install the axial traction tool at the rotor end, and install the ground anchor at the construction site to complete the rotor lifting work.

[0031] like Figure 3 As shown, in the stage of shaft diameter pulley in position II, after completing the rotor lifting work, install the pulley device at the shaft diameter position of the outgoing line end, install the slider tool at the non-outgoing line end, adjust the rotor lifting tool, slowly lower the rotor, so that the weight of the rotor is completely supported by the main slider and the shaft diameter pulley, disassemble the rotor lifting tool until it does not affect the axial movement of the rotor, and complete the stage of shaft diameter pulley in position II.

[0032] like Figure 4 , 5 As shown, during the axial movement stage in the stator bore, ensure that the axial load of the rotor is uniform and stable, gradually pull the rotor to move out of the stator bore, and the body slider synchronously adjusts its position to move forward in coordination. The weight of the rotor is supported by the body slider and the shaft diameter pulley, and gradually moves along the axial direction of the rotor. Further, the non-outlet end slider enters the stator bore, the body slider slides out of the stator and naturally falls onto the core protection tool. The weight of the rotor is supported by the non-outlet end slider and the shaft diameter pulley to continue to move axially, completing the axial movement stage 4 of the rotor body outside the stator bore at position IV.

[0033] like Figure 6 , 7As shown, at the stage where the body pulley is in place at position V, as the non-outgoing end slider approaches the stator end, stop pulling, install the body pulley under the rotor body, continue pulling the rotor until the rotor end face is exposed from the stator, fix the body pulley and clean up the site, remove the slide plate and other rotor extraction tools, and complete the final stage of rotor extraction at position VI. The rotor can be installed in the reverse steps above. This method does not require a gantry truck to install and extract the rotor. The installation and extraction process is simple, greatly saving the cost of plant construction, gantry truck configuration and operation and maintenance costs. This method does not require the use of a gantry truck lifting equipment to achieve a complete installation and extraction process of the rotor. The pulley guides and positions the rotor, reasonably distributes the rotor weight, ensures that the rotor is reliably supported throughout the process, makes full use of the stator space, avoids collisions between the stator and the rotor, saves costs, saves time, effort, and efficiently completes the installation and extraction of the rotor.

[0034] Although the main method of the present invention is described above in conjunction with the accompanying drawings, technicians in this industry should understand that the above embodiments do not limit the present invention in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A novel pulley rotor installation and extraction method for distributed phase condenser, characterized in that: The method is achieved by the following steps: S1, position I rotor lifting stage; S2, position II shaft diameter pulley in place stage; S3, position III: the rotor body is in the axial movement stage in the stator bore; S4, position IV: the rotor body is in the axial movement stage outside the stator bore; S5, position V, the main body pulley is in place; S6, position VI is the final stage of rotor extraction. The rotor extraction process is completed and the rotor extraction tool is removed. The rotor installation process is exactly the opposite of the above steps.

2. A novel pulley rotor installation and extraction method for a distributed phase regulator according to claim 1, characterized in that: In the above S1, before pulling out the rotor, the brush holder, the air seal ring and the large end cover of the soundproof cover are removed to expose the end plate of the stator base, and the rotor lifting tools are installed on the end plates on both sides of the stator base at position I. After ensuring that the lifting tools on both sides evenly carry the rotor, the bearings on both sides are removed, and the rotor lifting tools on both sides are adjusted to make the rotor vertically lifted upward in a horizontal state. During the lifting process, the air gap at the top of the stator and rotor gradually decreases, and the air gap at the bottom gradually increases. Always pay attention to avoid collision between the stator and rotor. When the air gap space at the bottom meets the conditions for installing the main body slider, stop lifting, install the core protection tool, the slide plate and the main body slider on the stator core, install the axial traction tool on the rotor end, and install the ground anchor at the construction site to complete the rotor lifting work.

3. The novel pulley rotor installation and extraction method for distributed phase condenser according to claim 1 is characterized in that: In S2, after the rotor lifting work is completed, a pulley device is installed at the axial diameter position of the outlet end, a slider tool is installed at the non-outlet end, the rotor lifting tool is adjusted, and the rotor is slowly lowered so that the weight of the rotor is completely supported by the main slider and the axial diameter pulley. The rotor lifting tool is disassembled until it does not affect the axial movement of the rotor, completing the position II axial diameter pulley placement stage.

4. The novel pulley rotor installation and extraction method for distributed phase condenser according to claim 1 is characterized in that: In the above S3, it is necessary to ensure that the axial load of the rotor is uniform and stable, and gradually pull the rotor to move outside the stator bore. The main body slider is synchronously adjusted to move forward in coordination. The weight of the rotor is supported by the main body slider and the shaft diameter pulley, and gradually moves along the axial direction of the rotor. The non-outlet end slider further enters the stator bore, and the main body slider slides out of the stator and naturally falls onto the core protection tool. The weight of the rotor is supported by the non-outlet end slider and the shaft diameter pulley to continue to move axially, completing the S4 position IV rotor body axial movement stage (4) outside the stator bore.

5. The novel pulley rotor installation and extraction method for distributed phase regulator according to claim 1 is characterized in that: In the above S5, when the non-outlet end slider approaches the stator end, stop pulling, install a body pulley under the rotor body, continue pulling the rotor until the rotor end face is exposed from the stator, fix the body pulley, clean up the site, remove the slide plate and other rotor extraction tools, complete S6, and install the rotor in the reverse order of the above steps.

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