Shielded motor flywheel installation process

Abstract

The present invention relates to a shielded motor flywheel installation process, which uses a hydraulic nut to fix the flywheel and a rotor positioning tool to fix the rotor. After the motor is turned over, a high-pressure water pump is used to expand the inner hole of the flywheel and the hydraulic nut is used to offset the axial force of the expanded water, and the flywheel is invertedly installed on the rotor, including the following steps: a. Install the hydraulic nut to fix the flywheel; b. Install the rotor positioning tool to position the rotor; c. After the motor is turned over, the high-pressure water pump is connected to the expansion hole of the flywheel; d. The hydraulic nut oil pipe is connected to the pressure-maintaining valve; e. The hydraulic nut is used to apply an axial thrust to the flywheel; f. The high-pressure water pump is turned on to inject water into the expansion hole of the flywheel, and the flywheel is inverted and pushed into the specified position of the rotor. The present invention can ensure that the flywheel and the rotor are stably installed with a tight amount, and the inverted installation can prevent the high-pressure expanded water in the inner hole of the flywheel from leaking into the inner cavity of the motor. Through this flywheel installation process, a dry environment can be provided for the inner cavity of the motor, thereby reducing the corrosion risk of the inner cavity parts of the motor and providing a guarantee for the normal operation of the motor.

Description

Technical field:

[0001] The invention relates to a shielded motor flywheel installation process. Background technology:

[0002] With the development and application of nuclear power technology, the safety of nuclear power plants has been continuously improved and enhanced, and large shielded motor pumps will be widely used. This shielded motor pump is delivered as a whole after being assembled by the manufacturer for easy installation in power stations. When the motor flywheel and rotor are installed, high-pressure water is required to expand the inner hole of the flywheel, and then the hydraulic nut fixed to the rotor offsets the axial force of the high-pressure water to push the flywheel into the rotor. Since the cooling medium of the motor cavity during operation is water, in order to ensure the cleanliness of the parts during motor installation, the expansion medium of the flywheel inner hole when the flywheel is installed on the rotor is also required to be water. The inner cavity parts of the shielded motor are all made of stainless steel. If they are in a humid environment for a long time, the corrosion risk of stainless steel parts will be greatly increased. To ensure the cleanliness of the parts during motor installation, the inner cavity of the flywheel is also required to be water. The environment inside the machine cavity is dry, so a hydraulic nut is needed to initially fix the flywheel to the rotor, and a rotor fixing tool is used to fix the axial position of the rotor so that when the workpiece is turned over, the rotor will not damage the thrust bearing friction pair at the bottom of the motor due to axial movement. After the motor is turned over, a high-pressure water pump and a hydraulic nut pipeline are connected. The high-pressure water provided by the high-pressure water pump is used to expand the inner hole of the flywheel, and then the hydraulic nut is pressurized with oil to push the flywheel to the specified axial position of the rotor. If the usual installation method is used, the expanded water from the inner hole of the flywheel will leak into the inner cavity of the motor, increasing the risk of corrosion of stainless steel parts in the inner cavity of the motor. For this reason, a new flywheel installation process is needed. Summary of the invention:

[0003] The purpose of the present invention is to provide a shielded motor flywheel installation process, which provides a dry environment for the inner cavity of the motor, thereby reducing the corrosion risk of the inner cavity parts of the motor and providing guarantee for the normal operation of the motor. The technical scheme of the present invention is: a shielded motor flywheel installation process, using a hydraulic nut (1) to fix the flywheel (2) on the rotor (3), closing the hydraulic nut pressure-maintaining valve (4), maintaining the oil pressure of the hydraulic nut (1), using a rotor positioning tool (5) to fix the axial position of the rotor (3), after the motor (9) is turned over, the high-pressure water pump (6) is connected to the expansion hole of the flywheel (2) through a high-pressure water pipe (7), the hydraulic nut oil pipe (8) is connected to the hydraulic nut pressure-maintaining valve (4), the hydraulic nut pressure-maintaining valve (4) is opened, and an axial thrust is applied to the flywheel (2) by injecting oil into the hydraulic nut (1), and the high-pressure water pump (6) is opened to inject water into the expansion hole of the flywheel (2), and the oil pressure of the hydraulic nut (1) is increased until the flywheel (2) is inverted and installed at a specified position on the rotor (3), comprising the following steps:

[0004] a) Using a hydraulic nut (1) to fix the flywheel (2) on the rotor (3) and closing the hydraulic nut pressure-maintaining valve (4) to maintain the oil pressure of the hydraulic nut (1);

[0005] b) fixing the axial position of the rotor (3) using a rotor positioning tool (5);

[0006] c) after the motor (9) is turned over, a support frame (10) is used to support the motor (9);

[0007] d) connecting the high-pressure water pump (6) to the expansion hole of the flywheel (2) through the high-pressure water pipe (7);

[0008] e) Connect the hydraulic nut oil pipe (8) to the hydraulic nut pressure-maintaining valve (4);

[0009] f) Open the hydraulic nut pressure-maintaining valve (4) and inject oil into the hydraulic nut (1) to pressurize the flywheel (2).

[0010] Apply axial thrust;

[0011] g) Turn on the high-pressure water pump (6) to inject water into the expansion hole of the flywheel (2), thereby increasing the oil pressure of the hydraulic nut (1) until the flywheel (2) is invertedly installed at the designated position on the rotor (3).

[0012] In step a), the flywheel (2) is fixed on the rotor (3) using a hydraulic nut (1), the flywheel (2) is pushed on the rotor (3) by 0.1 mm to 0.3 mm, and before the motor turns over, the flywheel (2) and the rotor (3) are interference-fitted to achieve self-locking.

[0013] Beneficial technical effects of the present invention:

[0014] In order to facilitate installation in power stations, the shielded motor pump of the present invention is delivered as a whole after being assembled by the manufacturer. When the motor flywheel and the rotor are installed, high-pressure water is needed to expand the inner hole of the flywheel, and then the axial force of the high-pressure water is offset by the hydraulic nut fixed to the rotor to push the flywheel to the specified position on the rotor. The existing flywheel installation process is to drop the flywheel onto the rotor, and then install the flywheel to the specified position of the rotor by installing the hydraulic nut to provide axial thrust and the high-pressure pneumatic pump to provide high-pressure expansion water between the flywheel and the rotor. The expansion water offsets the tightness between the flywheel and the rotor. The important sign is that the tightness fitting surface is separated, resulting in the leakage of the expansion water. This makes it inevitable that the expansion water will leak into the inner cavity of the motor when the flywheel is in the upper installation process of the motor, so that the inner cavity of the motor is in a humid environment for a long time, increasing the risk of rusting of the internal parts of the motor. The inner cavity parts of the shielded motor are all made of stainless steel. If they are in a humid environment for a long time, the corrosion risk of the stainless steel parts will be greatly increased.

[0015] The shielded motor flywheel installation process described in the present invention utilizes a hydraulic nut to position the flywheel and a rotor positioning tool to position the rotor to avoid the risk of damage or grinding caused by displacement of the flywheel and the rotor when the motor is turned over. After the motor is turned over, the flywheel is installed upside down so that the expanded water flows to the shaft extension end by gravity and is discharged to the outside of the motor, thereby avoiding leakage of the expanded water in the flywheel inner hole into the motor cavity. After the flywheel is installed, the motor cavity environment can be kept dry, thereby reducing the risk of corrosion of the motor cavity components. Description of the drawings:

[0016] Figure 1 This is a schematic diagram of the installation of the hydraulic nut and the hydraulic nut pressure maintaining valve.

[0017] Figure 2 This is a schematic diagram of the rotor positioning tool installation.

[0018] Figure 3 This is a schematic diagram of the support after the motor is turned over.

[0019] Figure 4 This is a schematic diagram of an inverted flywheel installation.

[0020] Figure 5 This is a partial enlarged view of the inverted installation of the flywheel.

[0021] Among them: hydraulic nut 1, flywheel 2, rotor 3, hydraulic nut pressure maintaining valve 4, rotor positioning tool 5, high-pressure water pump 6, high-pressure water pipe 7, hydraulic nut oil pipe 8, motor 9, support frame 10. Specific implementation method:

[0022] like Figure 1 As shown, the flywheel 2 is fixed to the rotor 3 by the hydraulic nut 1 and the hydraulic nut pressure-maintaining valve 4 is closed to maintain the oil pressure of the hydraulic nut 1. Figure 2 As shown, a rotor positioning tool 5 is used to fix the axial position of the rotor 3, such as Figure 3 As shown, after the motor 9 is turned over, the high-pressure water pump 6 is connected to the expansion hole of the flywheel 2 through the high-pressure water pipe 7, as shown in FIG. Figure 5 As shown, the hydraulic nut oil pipe 8 is connected to the hydraulic nut pressure-maintaining valve 4, the hydraulic nut pressure-maintaining valve 4 is opened, an axial thrust is applied to the flywheel 2 by injecting oil into the hydraulic nut 1, the high-pressure water pump 6 is turned on to inject water into the expansion hole of the flywheel 2, and the oil pressure of the hydraulic nut 1 is increased until the flywheel 2 is invertedly installed at a designated position on the rotor 3, including the following steps:

[0023] a) Use hydraulic nut 1 to fix flywheel 2 on rotor 3 and close hydraulic nut pressure-maintaining valve 4 to maintain oil pressure of hydraulic nut 1;

[0024] b) using a rotor positioning tool 5 to fix the axial position of the rotor 3;

[0025] c) After the motor 9 is turned over, the support frame 10 is used to support the motor 9;

[0026] d) If Figure 4 As shown, the high-pressure water pump 6 is connected to the expansion hole of the flywheel 2 through the high-pressure water pipe 7; e) the hydraulic nut oil pipe 8 is connected to the hydraulic nut pressure-maintaining valve 4;

[0027] f) opening the hydraulic nut pressure-maintaining valve 4 and applying axial thrust to the flywheel 2 by injecting oil into the hydraulic nut 1;

[0028] g) If Figure 5 As shown, the high-pressure water pump 6 is turned on to inject water into the expansion hole of the flywheel 2, and the oil pressure of the hydraulic nut 1 is increased until the flywheel 2 is invertedly installed at the designated position on the rotor 3;

[0029] like Figure 1 As shown, in step a), the flywheel 2 is fixed on the rotor 3 using a hydraulic nut 1, and the flywheel 2 is pushed on the rotor 3 by 0.1mm-0.3mm, so that the flywheel 2 and the rotor 3 are interference-fitted to achieve self-locking before the motor turns over.

Claims

1. A shielded motor flywheel installation process, characterized by: A hydraulic nut (1) is used to fix the flywheel (2) on the rotor (3), the hydraulic nut pressure-maintaining valve (4) is closed, the oil pressure of the hydraulic nut (1) is maintained, the rotor positioning tool (5) is used to fix the axial position of the rotor (3), the motor (9) is turned over, the high-pressure water pump (6) is connected to the expansion hole of the flywheel (2) through the high-pressure water pipe (7), the hydraulic nut oil pipe (8) is connected to the hydraulic nut pressure-maintaining valve (4), the hydraulic nut pressure-maintaining valve (4) is opened, the axial thrust is applied to the flywheel (2) by injecting oil into the hydraulic nut (1), the high-pressure water pump (6) is opened to inject water into the expansion hole of the flywheel (2), and the oil pressure of the hydraulic nut (1) is increased until the flywheel (2) is invertedly installed at a designated position on the rotor (3), comprising the following steps: a) Using a hydraulic nut (1) to fix the flywheel (2) on the rotor (3) and closing the hydraulic nut pressure-maintaining valve (4) to maintain the oil pressure of the hydraulic nut (1); b) fixing the axial position of the rotor (3) using a rotor positioning tool (5); c) after the motor (9) is turned over, a support frame (10) is used to support the motor (9); d) connecting the high-pressure water pump (6) to the expansion hole of the flywheel (2) through the high-pressure water pipe (7); e) Connect the hydraulic nut oil pipe (8) to the hydraulic nut pressure-maintaining valve (4); f) opening the hydraulic nut pressure-maintaining valve (4) and applying axial thrust to the flywheel (2) by injecting oil into the hydraulic nut (1); g) Turn on the high-pressure water pump (6) to inject water into the expansion hole of the flywheel (2), thereby increasing the oil pressure of the hydraulic nut (1) until the flywheel (2) is installed upside down at the designated position on the rotor (3).

2. According to the canned motor flywheel installation process described in claim 1, it is characterized by: In step a), the flywheel (2) is fixed on the rotor (3) using a hydraulic nut (1), the flywheel (2) is pushed on the rotor (3) by 0.1 mm to 0.3 mm, and before the motor turns over, the flywheel (2) and the rotor (3) are interference-fitted to achieve self-locking.

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