An alignment device for the main pump and the main pump motor of a nuclear power plant

Abstract

The present invention belongs to the technical field of rotating equipment in nuclear power plants, and particularly relates to an alignment device for the main pump and the main pump motor in a nuclear power plant. The structure is simple and the disassembly and assembly are convenient. Without disassembling the upper oil tank and the oil return chamber of the main pump motor and without installing an electric barring gear, the coupling alignment can be carried out, reducing the occupancy time of the overhead crane in the reactor building, completing the alignment work of the main pump motor with high efficiency and high quality, ensuring the use of the overhead crane for other equipment such as the reactor within the maintenance plan, guaranteeing the smooth implementation of the unit overhaul plan, and contributing to shortening the overhaul period and improving the unit maintenance efficiency.

Description

Technical Field

[0001] This application belongs to the technical field of rotating equipment in nuclear power plants, and particularly relates to an alignment device for a main pump and a main pump motor in a nuclear power plant. Background Art

[0002] The main pump of a nuclear power plant is used to establish the forced circulation of the coolant medium in the primary loop of the reactor and export the core heat. The supporting main pump motor is a squirrel-cage AC two-speed asynchronous motor, weighing about 50 tons. According to the requirements of the main pump motor maintenance outline, during a single reactor refueling cycle, 1 main pump motor needs to be disassembled and overhauled once. The upper cross support of the main pump motor is disassembled, and a lifting device is used to separate the stator and rotor components. The disassembled parts are inspected, maintained, and subjected to electrical performance tests. After meeting the technical parameter requirements, they are reinstalled according to specific maintenance procedures. During reinstallation, since the relative position between the rotor and the stator is determined by the radial guide pads in the upper and lower cross support structures of the main pump motor, and the height and levelness of the rotor need to be adjusted through the thrust pads in the lower cross support structure of the main pump motor, it is impossible to ensure that all technical parameters before and after the overhaul of the main pump motor are the same as the original ones. Therefore, before connecting the main pump and the main pump motor, it is necessary to verify and adjust the alignment data to ensure that the concentricity and parallelism of the main pump are within the standard requirements. Otherwise, it will cause the vibration of the main pump or the main pump motor to exceed the standard, affecting the safe and stable operation of the equipment.

[0003] Due to the special structure of the main pump motor and the large mass of the rotor components, etc., currently, it is necessary to remove the oil tank cover and the oil return chamber above the main pump motor, and only by installing an electric barring mechanism can the motor rotor be driven to achieve the alignment of the main pump and the main pump motor. This work requires the use of the ring crane in the nuclear island reactor hall. As the only lifting machinery in the hall, the long-term occupation of the ring crane will seriously affect the maintenance progress of other key equipment, delaying the main overhaul line plan of the unit, and then shortening the power generation time of the unit, affecting the economic benefits of the company. Summary of the Invention

[0004] The purpose of this application is to provide an alignment device for a main pump and a main pump motor in a nuclear power plant, which solves the problem that the long-term occupation of the ring crane in the nuclear island reactor hall for the alignment of the main pump and the main pump motor seriously affects the maintenance progress of other key equipment, delays the main overhaul line plan of the unit, and then shortens the power generation time of the unit, affecting the economic benefits of the company.

[0005] Technical solutions to achieve the purpose of this application:

[0006] The embodiment of this application provides a device for aligning a main pump and a main pump motor in a nuclear power plant, including: a connection component, a rotating component, and a measuring component;

[0007] The connection components are respectively fixedly connected to the motor rotor of the main pump motor and the rotating component, and are used to coaxially fix the motor rotor and the rotating component; the motor rotor, the connection components and the rotating component are all located above the main pump bearing;

[0008] The rotating component is also connected to the measuring component and is used to change the relative position between the motor rotor and the main pump bearing;

[0009] The measuring component is used to measure the concentricity and parallelism between the motor rotor and the main pump bearing.

[0010] Optionally, the rotating component includes: a rolling bearing and a connecting disk;

[0011] The central shaft is fixed inside the rolling bearing; the connecting disk is fixed outside the rolling bearing;

[0012] The central shaft and the connection component are fixed by a central shaft bolt, so that the connecting disk, the rolling bearing and the motor rotor are concentric;

[0013] The connecting disk is also fixedly connected to the measuring component.

[0014] Optionally, the rotating component further includes: at least 3 steel ball rollers;

[0015] The connecting disk is symmetrically provided with set screws holes corresponding to the steel ball rollers one by one, and the steel ball rollers are installed in the set screws holes;

[0016] The at least 3 steel ball rollers are in uniform contact with the contact surface of the connection component. Through the acting force of the steel ball rollers and the connection component, the rolling elements and the outer ring of the rolling bearing are fitted and the end play is eliminated.

[0017] Optionally, the rolling bearing is an angular contact ball bearing.

[0018] Optionally, the steel ball rollers are bolt-type steel ball rollers.

[0019] Optionally, the measuring component includes: at least two groups of measuring arms; the at least two groups of measuring arms are symmetrically arranged on the connecting disk; the measuring arm includes: a connecting arm and a dial indicator;

[0020] The connecting arm fixes the dial indicator on the outer edge of the measuring disk;

[0021] The dial indicator is used to measure the concentricity and parallelism of the measuring disk relative to the main pump bearing.

[0022] Optionally, the connecting arm includes three movable connecting rods: a first connecting rod, a second connecting rod and a third connecting rod;

[0023] One end of the first connecting rod is fixedly connected to the connecting disc by bolts, the other end of the first connecting rod is connected to one end of the second connecting rod, the other end of the second connecting rod is connected to one end of the third connecting rod, and a dial indicator is fixed to the other end of the third connecting rod.

[0024] The angle between the first connecting rod and the second connecting rod and the angle between the second connecting rod and the third connecting rod are variable.

[0025] Optionally,

[0026] A plurality of measurement marking groups are provided on the housing of the main pump bearing;

[0027] Each of the measurement marking groups includes a measurement mark corresponding to the dial indicator one by one, so that the dial indicator measures the concentricity of the motor rotor and the main pump bearing based on the measurement marks in the measurement marking group.

[0028] Optionally, the connection assembly includes: a torsion bar coupling and a clamp;

[0029] The upper end of the torsion bar coupling is fixedly connected to the electronic rotor through the clamp, and the torsion bar coupling is coaxial with the electronic rotor;

[0030] The lower end of the torsion bar coupling is coaxially fixed to the rotating assembly.

[0031] The beneficial technical effects of the present application are as follows:

[0032] 1) A centering device for a nuclear power plant main pump and a main pump motor provided by an embodiment of the present application has a simple structure and is easy to use. On the basis of the design, it can be manufactured by purchasing standard parts, machining, etc.; it can avoid partial disassembly of the main pump motor before centering, avoid the extra workload caused by centering, and save the occupancy time of the overhead crane.

[0033] 2) A centering device for a nuclear power plant main pump and a main pump motor provided by an embodiment of the present application can avoid using an external electric barring device and reduce the use of other electric tools; it can achieve centering without rotating the motor rotor, and avoid damage to the thrust bearing pads under abnormal lubrication conditions during the centering process.

[0034] 3) A centering device for a nuclear power plant main pump and a main pump motor provided by an embodiment of the present application can reduce the need for external electric equipment, reduce industrial risks, shorten working hours, reduce the radiation dose of maintenance personnel, and improve the safety and reliability of on-site maintenance operations. Description of the Drawings

[0035] Figure 1 This is a schematic structural diagram of an alignment device for a main pump and a main pump motor provided by an embodiment of the present application.

[0036] In the figure:

[0037] 1 - Connection assembly; 11 - Central shaft bolt, 12 - Torsion bar coupling, 13 - Clamp;

[0038] 2 - Rotating assembly; 21 - Rolling bearing, 22 - Connection disk, 23 - Steel ball roller, 24 - Bolt, 25 - Central shaft;

[0039] 3 - Measuring assembly; 31 - Connection arm, 32 - Dial indicator;

[0040] 4 - Motor rotor;

[0041] 5 - Main pump bearing. Specific embodiments

[0042] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the embodiments described below are only a part of the embodiments of the present application, rather than all of them. Based on the embodiments described in the present application, all other embodiments obtained by those skilled in the art without creative efforts are within the scope of protection of the present application.

[0043] In order to solve the problems of the prior art, an alignment device for a main pump and a main pump motor provided by an embodiment of the present application has a simple structure and is convenient for disassembly and assembly. It can perform coupling alignment without disassembling the upper oil tank and the oil return chamber of the main pump motor and without installing an electric barring gear mechanism, reducing the occupancy time of the overhead crane in the reactor building, completing the alignment work of the main pump motor with high efficiency and high quality, ensuring the use of the overhead crane for other equipment such as the reactor within the maintenance plan, and guaranteeing the smooth implementation of the unit overhaul plan, contributing to shortening the overhaul period and improving the unit maintenance efficiency.

[0044] Based on the above content, in order to clearly and detailedly illustrate the above advantages of the present application, the specific embodiments of the present application will be described below with reference to the accompanying drawings.

[0045] See Figure 1 , which is a schematic structural diagram of an alignment device for a main pump and a main pump motor provided by an embodiment of the present application.

[0046] An alignment device for a main pump and a main pump motor provided by an embodiment of the present application includes: a connection assembly 1, a rotating assembly 2, and a measuring assembly 3;

[0047] The connecting component 1 is fixedly connected to the motor rotor 4 of the main pump motor and the rotating component 2 respectively, and is used to coaxially fix the motor rotor 4 and the rotating component 2; the motor rotor 4, the connecting component 1 and the rotating component 2 are all located directly above the main pump bearing 5;

[0048] The rotating component 2 is also connected to the measuring component 3 and is used to change the relative position between the motor rotor 4 and the main pump bearing 5;

[0049] The measuring component 3 is used to measure the concentricity and parallelism between the motor rotor 4 and the main pump bearing 5.

[0050] In a specific example, when the main pump motor is disassembled and overhauled, first adjust the motor rotor 4 to the center of the stator. The motor rotor 4 is in a horizontal and concentric state, and the motor rotor 4 is locked and fixed by the radial guide pads symmetrically distributed in the upper and lower cross support structures to prevent it from shifting during transportation and hoisting. Fix the connecting component 1 to the motor rotor 4 of the main pump motor, then fix the motor rotor 4 at the center of the stator through the lower radial guide pad, and connect the rotating component 2 before hoisting it to the bracket above the main pump bearing 5.

[0051] It should be noted here that in actual applications, the top screw of the upper radial guide pad on a certain main pump motor is located in a closed oil return chamber and is inconvenient to operate. Therefore, the lower radial guide pad is selected to fix the motor rotor 4 at the center. Other equipment should make reasonable selections in combination with its own structure during specific implementation, which will not be listed one by one here.

[0052] In the embodiment of the present application, the rotating component 2 changes the relative position between the motor rotor 4 and the main pump bearing 5; the measuring component 3 measures the concentricity and parallelism between the motor rotor 4 and the main pump bearing 5. According to the measurement by the measuring component 3 and using the rotating component 2 to change the relative position between the motor rotor 4 and the main pump bearing 5, the centering of the motor rotor 4 and the main pump bearing 5 can be achieved without disassembling the oil tank cover and the oil return chamber above the main pump motor, avoiding the long-term occupation of the overhead crane in the nuclear island reactor hall.

[0053] In the embodiment of the present application, the rotating component 2 may specifically include: a rolling bearing 21, a connecting disk 22 and a central shaft 25;

[0054] The central shaft 25 is fixed inside the rolling bearing 21; the connecting disk 22 is fixed outside the rolling bearing 21;

[0055] The central shaft 25 is fixed to the connecting component 1 through a central shaft bolt 11 so that the connecting disk 22, the rolling bearing 21 and the motor rotor 4 are concentric;

[0056] The connecting disk 22 is also fixedly connected to the measuring component 3.

[0057] It can be understood that the central axis 25 is connected to the connection assembly 1 by using the central axis bolt 11. A connection disk 22 is arranged outside the rolling bearing 21, and the rotation of the connection disk 22 relative to the connection assembly 1 and the motor rotor 4 can be realized.

[0058] In some possible implementation manners of the embodiment of the present application, to avoid the influence of the clearance of the rolling bearing 21 on the rotation accuracy of the connection disk 22, the rotation assembly 2 may further include: at least three steel ball rollers 23;

[0059] The connection disk 22 is symmetrically provided with set screw holes corresponding to the steel ball rollers 23 one by one, and the steel ball rollers 23 are installed in the set screw holes;

[0060] At least three steel ball rollers 23 are in uniform contact with the contact surface of the connection assembly 1. Through the acting force between the steel ball rollers 23 and the connection assembly 1, the rolling elements and the outer ring of the rolling bearing 22 are fitted and the running clearance is stuck.

[0061] As an example, the rolling bearing 22 may specifically be an angular contact ball bearing.

[0062] In another example, the steel ball roller 23 may specifically be a bolt-type steel ball roller.

[0063] In some possible implementation manners of the present application, the connection assembly 1 may specifically include: a torsion bar coupling 12 and a clamp 13;

[0064] The upper end of the torsion bar coupling 12 is fixedly connected to the electronic rotor 4 through the clamp 13, and the torsion bar coupling 12 is coaxial with the electronic rotor 4;

[0065] The lower end of the torsion bar coupling 12 is coaxially fixed to the rotation assembly 2.

[0066] In some possible implementation manners of the embodiment of the present application, the measuring assembly 3 may specifically include: at least two groups of measuring arms; at least two groups of measuring arms are symmetrically arranged on the connection disk 22; the measuring arm includes: a connecting arm 31 and a dial indicator 32;

[0067] The connecting arm 31 fixes the dial indicator 32 on the outer edge of the measuring disk 22;

[0068] The dial indicator 32 is used to measure the concentricity and parallelism of the measuring disk 22 relative to the main pump bearing 5.

[0069] In a specific example, the connecting arm 31 includes three movable connecting rods: a first connecting rod 311, a second connecting rod 312, and a third connecting rod 313;

[0070] One end of the first connecting rod 311 is fixed to the connecting plate 312 by bolts 24. The other end of the first connecting rod 311 is connected to one end of the second connecting rod 312. The other end of the second connecting rod 312 is connected to one end of the third connecting rod 313. A dial indicator 32 is fixed to the other end of the third connecting rod 313.

[0071] The angle between the first connecting rod 311 and the second connecting rod 312 and the angle between the second connecting rod 312 and the third connecting rod 313 are variable.

[0072] In practical applications, when measuring concentricity, the probes of the two dial indicators 32 are both in the horizontal direction. The offset is half of the difference between the measurement data of the two dial indicators 32, and the moving direction is the radial outer direction of the position corresponding to the dial indicator 32 with the larger value. When measuring parallelism, the probes of the two dial indicators 32 are both vertically upward. The offset is n times the difference between the measurement data of the two dial indicators 32, and the moving direction is the upward direction of the axis corresponding to the dial indicator 32. The value of n is the ratio of the radius of the motor parallelism adjustment position to the rotation radius of the dial indicator 32 measurement position.

[0073] In some possible implementation manners of the present application, a plurality of measurement marking groups are provided on the housing of the main pump bearing 5;

[0074] Each measurement marking group includes a measurement mark corresponding to the dial indicator 32 one by one, so that the dial indicator 32 measures the concentricity between the motor rotor 4 and the main pump bearing 5 based on the measurement marks in the measurement marking group.

[0075] Next, a specific example is used to detail the specific installation method and usage method of an alignment device for a nuclear power plant main pump and a main pump motor provided by the embodiments of the present application.

[0076] 1) After the main pump motor 4 is disassembled and repaired, the motor rotor 4 is fixed at the center of the stator through the lower radial guide bearing. Before hoisting it to the support above the main pump, the torsion bar coupling 12 is effectively fixed to the motor rotor 4 and it is confirmed that the mating position cannot be changed;

[0077] 2) Use a bearing heater to heat the inner ring of the rolling bearing 21 and install it above the central shaft 25;

[0078] 3) After the rolling bearing 21 returns to the normal temperature state, install the connecting plate 22 on the outer ring of the rolling bearing 21;

[0079] 4) Install 3 steel ball rollers 23 in the evenly distributed set screw holes on the circumference of the connecting plate 22;

[0080] 5) Use the central shaft bolt 11 to fix the assembly obtained in steps 2) - 4) below the torsion bar coupling 12;

[0081] 6) Use an Allen wrench to adjust the installation depth of the ball roller 12 so that it evenly contacts the lower end of the torsion bar coupling 12. At the same time, slightly shake the connecting disc 22 to ensure that under the reaction force between the ball roller 23 and the torsion bar coupling 12, the rolling elements and the outer ring of the rolling bearing 21 are in contact. Otherwise, continue to tighten the ball roller 23 until the end-play clearance of the rolling bearing 21 is completely eliminated. Install the connecting arm 31 and the dial indicator 32 on the outer circle and the end face of the connecting disc 22 to adjust the radial and axial runout values of the connecting disc 22.

[0082] 7) Use the bolt 24 to fix the connecting arm 31 above the connecting disc 22. At the same time, adjust the horizontal length and vertical height of the connecting arm 31 so that the probe of the dial indicator 31 touches the measurement position on the housing of the main pump bearing 5.

[0083] 8) Evenly mark several positions on the measurement position of the housing of the main pump bearing 5. Rotate the connecting disc 22 and record the readings of the dial indicator 32 at the corresponding marked positions.

[0084] 9) When measuring concentricity, the probes of both dial indicators 32 are in the horizontal direction. The offset is half of the difference between the measurement data of the two dial indicators 32, and the moving direction is the radial outer direction of the position corresponding to the dial indicator 32 with the larger value.

[0085] 10) When measuring parallelism, the probes of both dial indicators 32 are vertically upward. The offset is n times the difference between the measurement data of the two dial indicators 32, and the moving direction is the upward direction of the axis corresponding to the dial indicator 32. The value of n is the ratio of the radius of the adjustment position of the motor parallelism to the radius of rotation of the measurement position of the dial indicator 32.

[0086] 11) Adjust the installation position of the main pump motor based on the above data. After the adjustment is completed, repeat the measurements and adjustments according to steps 8) - 10) in sequence until the measured offset values are all within the standard range required by the technical procedure.

[0087] 12) Loosen the bolt 24, remove the connecting arm 31, disassemble the central shaft bolt 11, and take out the central shaft 25 and the connecting disc 22 as a whole, and store them in the designated position.

[0088] 13) Loosen the radial guide bearing at the lower part of the main pump motor, and connect the docking position above the torsion bar coupling 12 and the housing of the main pump bearing 5 as appropriate.

[0089] Through the above operations, it is possible to complete the alignment of the main pump and the main pump motor without rotating the rotor of the main pump motor.

[0090] In an alignment device for a main pump and a main pump motor provided in an embodiment of the present application, a central shaft 25 and a connecting disk 22 are connected together through a rolling bearing 21 to achieve a relative rotation function. At this time, the central shaft 25 together with the connecting disk 22 is fastened below a torsion bar coupling 12 through a central shaft bolt 11 to achieve concentric arrangement of a motor rotor 4, the torsion bar coupling 12 and a rotating assembly 2. A connecting arm 31 with a suitable length is fixed on the outer edge of the connecting disk 22. The specific value of the relative position between the center of the main pump bearing 5 housing and the center of the motor rotor 4 can be measured through the connecting disk 228, providing a data basis for the subsequent concentricity and parallelism adjustment work. By calculating the motor offset value through the data and making adjustments, the alignment work of the main pump and the main pump motor can be completed.

[0091] The present application has been described in detail above in conjunction with the accompanying drawings and embodiments. However, the present application is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present application. The content not described in detail in the present application can all adopt the prior art.

Claims

1. A device for aligning a main pump and a main pump motor in a nuclear power plant, characterized in that, the device includes: a connection assembly, a rotating assembly and a measuring assembly; the connection assembly is fixedly connected to the motor rotor of the main pump motor and the rotating assembly respectively, and is used to coaxially fix the motor rotor and the rotating assembly; the motor rotor, the connection assembly and the rotating assembly are all located above the main pump bearing; the rotating assembly is also connected to the measuring assembly and is used to change the relative position between the motor rotor and the main pump bearing; the measuring assembly is used to measure the concentricity and parallelism between the motor rotor and the main pump bearing; the rotating assembly includes: a rolling bearing, a connection disk and a central shaft; the central shaft is fixed inside the rolling bearing; the connection disk is fixed outside the rolling bearing; the central shaft is fixedly connected to the connection assembly through a central shaft bolt, so that the connection disk, the rolling bearing and the motor rotor are concentric; the connection disk is also fixedly connected to the measuring assembly; the rotating assembly further includes: at least 3 steel ball rollers; the connection disk is symmetrically provided with set screws holes corresponding to the steel ball rollers one by one, and the steel ball rollers are installed in the set screws holes; the at least 3 steel ball rollers are in uniform contact with the contact surface of the connection assembly, and through the acting force between the steel ball rollers and the connection assembly, the rolling elements and the outer ring of the rolling bearing are fitted and the end play is stuck.

2. The device for aligning a main pump and a main pump motor in a nuclear power plant according to claim 1, characterized in that, the rolling bearing is an angular contact ball bearing.

3. The device for aligning a main pump and a main pump motor in a nuclear power plant according to claim 1, characterized in that, the steel ball rollers are bolt-type steel ball rollers.

4. The device for aligning a main pump and a main pump motor in a nuclear power plant according to claim 1, characterized in that, the measuring assembly includes: at least two groups of measuring arms; the at least two groups of measuring arms are symmetrically arranged on the connection disk; the measuring arm includes: a connecting arm and a dial indicator; the connecting arm fixes the dial indicator on the outer edge of the connection disk; the dial indicator is used to measure the concentricity and parallelism of the measuring arm relative to the main pump bearing.

5. The device for aligning a main pump and a main pump motor in a nuclear power plant according to claim 4, characterized in that, the connecting arm includes three movable connecting rods: a first connecting rod, a second connecting rod and a third connecting rod; one end of the first connecting rod is fixedly connected to the connection disk through a bolt, the other end of the first connecting rod is connected to one end of the second connecting rod, the other end of the second connecting rod is connected to one end of the third connecting rod, and the other end of the third connecting rod is fixed with the dial indicator; the angle between the first connecting rod and the second connecting rod and the angle between the second connecting rod and the third connecting rod are variable.

6. The device for aligning a main pump and a main pump motor in a nuclear power plant according to claim 4, characterized in that, a plurality of measuring mark groups are arranged on the housing of the main pump bearing; Each of the measurement mark groups includes measurement marks corresponding one by one to the dial indicators, so that the dial indicators measure the concentricity between the motor rotor and the main pump bearing based on the measurement marks in the measurement mark groups.

7. The device for centering the main pump and the main pump motor in a nuclear power plant according to claim 1, characterized in that the connection assembly includes: a torsion bar coupling and a clamping holder; the upper end of the torsion bar coupling is fixedly connected to the motor rotor through the clamping holder, and the torsion bar coupling is coaxial with the motor rotor; the lower end of the torsion bar coupling is fixedly coaxial with the rotating assembly.

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