Installation method of a bearing-mounted permanent magnet shaft generator

Abstract

The present invention relates to an installation method for a bearing-mounted permanent magnet shaft generator, comprising the following steps: unpacking and inspection; hoisting the propeller shaft and the intermediate shaft into the engine room in sequence; hoisting the generator into the engine room: removing the support frames of the stator box body and the rotor shaft to ensure that the support ring and the rotor coil do not come into contact; turning the main engine by hand to ream the hole; conducting on-board inspection; checking the air gap between the rotor shaft coil and the stator coil after the epoxy load of the shafting is qualified, and the air gap is 6 ± 0.6 mm; removing the remaining 4 front + 4 rear brackets; providing jacking brackets at both axial ends and both radial ends of the stator box body. During hoisting in the present invention, a bolt hole and a lifting ring of the rotor shaft flange are threaded through by a steel wire rope, and the rotor shaft and the stator box body are relatively fixed during the hoisting process. The 8 T-shaped and L-shaped brackets without bolts reserved during the installation process can be easily moved back and forth to ensure uniform air gaps around the rotor coil and the stator coil, and the main engine can be smoothly turned by hand, effectively reducing the influence of magnetic suction force during the hoisting and installation processes.

Description

Technical Field

[0001] The present invention relates to the technical field of ship generators, and particularly relates to an installation method for a shaft-mounted permanent magnet shaft generator. Background Art

[0002] The power station of a ship is determined according to the electric load of the whole ship. Through the electric load calculation book, the total power of the generators on the whole ship can be determined. By using a shaft generator, under the condition of meeting the same ship design, the power dependence on diesel generators can be reduced, and at the same time, the fuel consumption can be reduced. Under the condition of the same voyage, the requirements of the third stage of EEDI are met.

[0003] How to apply the shaft-mounted shaft generator, especially the permanent magnet shaft generator, to a real ship and successfully hoist, align and install it requires step-by-step decomposition. It is known that during hoisting and installation, due to the magnetic field suction, the rotor shaft will deviate to one side. Conventionally, it is very difficult to ensure that the air gaps around the rotor coil and the stator coil are uniform. How to overcome this problem has troubled us for a long time. Through research and analysis, we have found a solution. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above deficiencies and provide an installation method for a shaft-mounted permanent magnet shaft generator, which effectively reduces the influence of magnetic suction during hoisting and installation.

[0005] The purpose of the present invention is achieved as follows:

[0006] An installation method for a shaft-mounted permanent magnet shaft generator includes the following steps:

[0007] Step 1: Open the box for inspection; check the coil condition, the support ring and support frame between the rotor shaft and the stator box, and the base condition of the stator box;

[0008] Step 2: Hoist the propeller shaft and the intermediate shaft into the engine room in sequence and place them in place;

[0009] Step 3: Hoist the integral shaft-mounted shaft generator into the engine room;

[0010] Step 4: Arrange the roller brackets for temporary support of the shafting in place, and arrange the adjusting combined tooling and bolts for the stator box in place; remove the support frames of the stator box and the rotor shaft to ensure that the support ring does not contact the rotor coil;

[0011] Step 5: Under the condition that the support ring does not contact the rotor coil, the main engine can be turned over, and the bolt holes of the rotor shaft flange and the intermediate shaft flange are paired and reamed;

[0012] Step 6: The height of the stator box can be adjusted by the height-adjusting bolts on its base to ensure uniform upper and lower air gaps between the stator coil (magnet permanent magnet coil) and the rotor coil in the stator box; the jacking frames installed at the four corners and eight points of the hull base are adjusted through these eight points to ensure uniform left and right air gaps between the stator coil and the rotor coil in the stator box.

[0013] Step 7: Ship trial; when checking the zigzag and offset of the shafting flange during ship trial, always ensure that the stator box and the rotor shaft do not contact, and the remaining T-shaped and L-shaped brackets without bolts can be easily moved back and forth.

[0014] Step 8: After the shafting epoxy load is qualified, check the air gap between the rotor shaft coil and the stator coil while ensuring that the first 4 + the last 4 brackets can be easily moved back and forth. The air gap is a, and a is 6 ± 0.6 mm.

[0015] Step 9: Remove the remaining first 4 + the last 4 brackets and restore the small covers at both ends.

[0016] Step 10: Jacking frames are provided at both axial ends and both radial ends of the stator box.

[0017] Preferably, in Step 1, open the small covers on the end covers at both left and right ends of the stator box, check whether the T-shaped brackets and L-shaped brackets are in place, and ensure that the rotor shaft does not move axially forward and backward.

[0018] Preferably, in Step 3, use the 4 main lifting lugs on the generator to lift the whole motor into the engine room; install a lifting ring on the auxiliary lifting lug, pass the steel wire rope through a bolt hole of the rotor shaft flange and the lifting ring, and the rotor shaft and the stator box are relatively fixed during hoisting.

[0019] Preferably, in Step 5, open the small covers on the end covers at both ends of the stator box, remove the fixing bolts of the T-shaped brackets and L-shaped brackets. Except for retaining 4 T-shaped brackets and L-shaped brackets in the ±45° directions and at the diagonals, remove the brackets one by one. After ensuring that the rotor shaft and the intermediate shaft are supported by the roller brackets, appropriately fine-tune the height-adjusting bolts of the base of the stator box so that the remaining 8 brackets can be easily moved back and forth, that is, it can be considered that the stator box and the rotor shaft are separated and the main engine can be smoothly turned over.

[0020] Preferably, there are 4 jacking frames axially and 4 jacking frames radially.

[0021] Preferably, after the position of the stator box is adjusted in place, the jacking frame is fixed to the bottom of the stator box by spot welding through a thrust block.

[0022] The beneficial effects of the present invention are:

[0023] Use the main lifting lug on the generator to lift the whole motor into the engine room. Install a lifting ring on the auxiliary lifting lug, pass a steel wire rope through a bolt hole of the rotor shaft flange and the lifting ring, and keep the rotor shaft and the stator box relatively fixed during the lifting process;

[0024] Remove the brackets one by one. Except for the 4 T-shaped brackets and L-shaped brackets in the ±45° direction and the diagonal positions, always ensure that the stator box and the rotor shaft do not touch. The remaining 8 T-shaped and L-shaped brackets without bolts can be easily moved back and forth to ensure uniform air gaps around the rotor coil and the stator coil, and the main engine can be smoothly turned over;

[0025] The jacking frame facilitates the lateral adjustment of the stator box to meet the air gap requirements of the coil. The jacking frame presses against the equipment base to reduce the adverse magnetic suction force during installation. After the position of the stator box is adjusted in place, the jacking frame is fixed to the bottom of the stator box by spot welding through the thrust block. Description of the Drawings

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 is Figure 1 the side view of

[0028] Figure 3 It is a distribution schematic diagram of the thrust blocks between the jacking frame and the stator box in the ship delivery state.

[0029] Wherein:

[0030] T-shaped bracket 1; L-shaped bracket 2; rotor shaft 3; end cover 4; stator box 5; rotor shaft flange 6; main lifting lug 7; auxiliary lifting lug 8; intermediate shaft flange 9; flywheel flange 10; jacking frame 11; connecting plate 11.1; jacking plate 11.2; horizontal adjustment bolt 11.3; jacking bolt 12; thrust block 13; base 14. Specific Embodiments

[0031] See Figures 1-3 , the present invention relates to an installation method of a shaft-mounted permanent magnet shaft generator, including the following steps:

[0032] 1. Inspection upon arrival and unpacking. Open the front and rear covers, and routinely check the T-shaped bracket 1 and the L-shaped bracket 2 to determine whether there is a possibility of the forward and backward movement of the rotor shaft 3, and lift the permanent magnet generator into the engine room;

[0033] End covers 4 are provided at both left and right ends of the stator housing 5. The rotor shaft 3 extends out of the stator housing 5 at both ends. A rotor shaft flange 6 is provided at the end of the rotor shaft 3. Main lifting lugs 7 are symmetrically provided at the front and back of the upper part of the outer circle of the end cover 4, and auxiliary lifting lugs 8 are symmetrically provided at the front and back of the lower part. During hoisting, the main lifting lugs 7 play a hoisting role. A lifting ring is installed on the auxiliary lifting lugs 8, and a steel wire rope passes through a bolt hole of the rotor shaft flange and the lifting ring, so that the rotor shaft and the stator housing are relatively fixed during the hoisting process to prevent the instability phenomenon caused by the axial movement of the shaft during the process of being hoisted into the engine room; at the same time, check whether the tightening tool in the later stage is convenient (anchor bolt M64).

[0034] 3. After the fine alignment wire illumination of the dock is completed, the propeller shaft and the intermediate shaft are successively hoisted into the engine room, and the temporary roller supports for the shafting are arranged in place.

[0035] 6. The four main lifting lugs 7 on the generator are used to hoist the motor as a whole into the engine room, and the 4 jacking bolts 12 on the stator housing 5 and the temporary roller supports are used to adjust the concentricity with the intermediate shaft flange 9, and at the same time, the concentricity with the flywheel flange 10.

[0036] 9. The roller supports for the temporary support of the shafting are arranged in place, the adjustment combination tooling and bolts for the stator housing are arranged in place; the support frames of the stator housing and the rotor shaft are removed to ensure that the support ring and the rotor coil do not contact;

[0037] Remove the small cover plates on the end covers 4 at both ends of the stator housing 5, and remove the fixing bolts of the T-shaped bracket 1 and the L-shaped bracket 2; except for the 4 T-shaped brackets 1 and L-shaped brackets 2 in the ±45° direction and at the diagonals, remove the brackets one by one; after ensuring that the rotor shaft 3 and the intermediate shaft are supported by the roller supports, slightly adjust the jacking bolts 12 of the base of the stator housing 5 so that the remaining 8 brackets can move forward and backward more easily (still retained), that is, it can be considered that the stator housing 5 and the rotor shaft 3 are separated;

[0038] 15. When the main engine can be turned over with the support ring and the rotor coil not contacting, the bolt holes of the rotor shaft flange and the intermediate shaft flange are paired and reamed.

[0039] 18. The height of the stator housing can be adjusted by the jacking bolts on its base to ensure that the upper and lower air gaps between the stator coil and the rotor coil of the stator housing are uniform;

[0040] The jacking screw frames installed at the four corners and eight points of the hull foundation are adjusted through these eight points to ensure that the left and right air gaps between the stator coil and the rotor coil of the stator housing are uniform;

[0041] 24. During the actual ship acceptance of the tortuosity and offset of the shafting flange of the actual ship, always ensure that the stator housing 5 and the rotor shaft 3 do not contact (the remaining 8 T-shaped and L-shaped brackets without bolts can move forward and backward easily).

[0042] 8. After the epoxy load of the shaft system is qualified, while ensuring that the front 4 + rear 4 brackets can move back and forth easily, check the air gap between the stator coil and the rotor coil. The air gap is a, and a is 6±0.6mm; process and install the shaft stator box gasket, tighten the bolts, and drive the locating pins.

[0043] 9. Remove the remaining front 4 (L-shaped) + rear 4 (T-shaped) bracket connecting pieces and restore the small covers at both ends.

[0044] 10. In order to ensure smooth adjustment of the stator case 5 and avoid the influence of a circle of permanent magnets on the stator case 5 on the adjustment process, top screw racks 11 are provided at both axial and radial ends of the stator case 5 to facilitate the lateral adjustment of the stator case 5 to meet the coil air gap requirements, and the stator case 5 is supported by horizontal adjustment bolts 11.3 to reduce the unfavorable magnetic attraction during installation.

[0045] The top screw racks 11 are provided with 4 axially and 4 radially, and the top screw racks 11 include a connecting plate 11.1 and a top screw plate 11.2. The upper parts of the two connecting plates 11.1 are connected by the top screw plate 11.2. The top screw plate 11.2 is provided with a horizontal adjustment bolt 11.3. The bottom of the connecting plate 11.1 is in contact with the base 14. The horizontal adjustment bolt supports the stator case 5. After the position of the stator case 5 is adjusted in place, the top screw rack 11 is spot-welded and fixed to the bottom of the stator case 5 through the thrust block 13.

[0046] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. An installation method of a bearing-mounted permanent magnet shaft generator, characterized in that: It includes the following steps: Step 1: Unpack and inspect; Step 2: Hoist the paddle shaft and the intermediate shaft into the engine room in sequence and place them in position; Step 3: Hoist the integral bearing-mounted permanent magnet shaft generator into the engine room; Step 4: Arrange the roller brackets for temporary support of the rotor shaft and the intermediate shaft in position and arrange the bolts in position; Remove the fixing bolts of the T-shaped brackets and L-shaped brackets, retain 4 T-shaped brackets at the rear and 4 L-shaped brackets at the front in the directions of ±45° and diagonally between the stator housing and the rotor shaft, and remove the other brackets between the stator housing and the rotor shaft to ensure that the support ring between the stator housing and the rotor shaft does not contact the rotor coil; Step 5: When the support ring and the rotor coil do not contact, the main engine can be turned over, and the bolt holes of the rotor shaft flange and the intermediate shaft flange are paired and reamed; Step 6: The height of the stator housing is adjusted by the jacking bolts on its base to ensure that the upper and lower air gaps between the stator coil and the rotor coil of the stator housing are uniform; The jacking brackets are installed at a total of eight points at the axial two ends and radial two ends of the four corners at the bottom of the stator housing on the hull base. Through the adjustment of these eight points, the left and right air gaps between the stator coil and the rotor coil of the stator housing are made uniform; Step 7: Conduct on-board inspection and acceptance; When inspecting the tortuosity and offset of the shafting flange during on-board inspection and acceptance, always ensure that the stator housing and the rotor shaft do not contact, and the remaining 8 T-shaped brackets and L-shaped brackets without bolts can be easily moved back and forth; Step 9: After the epoxy load of the shafting is qualified, check the air gap between the rotor coil and the stator coil under the condition that the first 4 L-shaped brackets + the last 4 T-shaped brackets can be easily moved back and forth. The air gap is a, and a is 6 ± 0.6 mm; Step 10: Remove the remaining first 4 L-shaped brackets + the last 4 T-shaped brackets and restore the small covers on the left and right end covers of the stator housing; In Step 3, main lifting lugs are symmetrically arranged at the front and rear of the upper part of the outer edge of the end cover, and auxiliary lifting lugs are symmetrically arranged at the front and rear of the lower part. The generator is hoisted into the engine room as a whole by using the 4 main lifting lugs on the generator; Install a lifting ring on the auxiliary lifting lug, and pass the steel wire rope through a bolt hole of the rotor shaft flange and the lifting ring. During the hoisting process, the rotor shaft and the stator housing are relatively fixed; There are 4 axially and 4 radially arranged jacking brackets; After the position of the stator housing is adjusted in place, the jacking bracket is spot-welded and fixed to the bottom of the stator housing through a thrust block.

2. The installation method of a bearing-mounted permanent magnet shaft generator according to claim 1, characterized in that: In Step 1, open the small covers on the left and right end covers of the stator housing, check the support ring, T-shaped brackets, L-shaped brackets, and the base of the stator housing between the rotor shaft and the stator housing, ensure that the T-shaped brackets and L-shaped brackets are installed in place, and the rotor shaft does not move back and forth; 3. The installation method of a bearing-mounted permanent magnet shaft generator according to claim 1, characterized in that: In Step 4, open the small covers on the end covers at both ends of the stator housing. After ensuring that the rotor shaft and the intermediate shaft are supported by the roller brackets, slightly adjust the jacking bolts of the stator housing so that the remaining T-shaped brackets and L-shaped brackets can be easily moved back and forth, which means that the stator housing and the rotor shaft are separated and the main engine can be smoothly turned over.

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