CN218387212U - Centering device for main pump and main pump motor of nuclear power station - Google Patents

Abstract

The utility model belongs to the technical field of the nuclear power station rotation equipment, concretely relates to centering device for nuclear power station main pump and main pump motor, moreover, the steam generator is simple in structure, easy dismounting, not dismantling main pump motor upper portion oil tank and oil return chamber, carry out the shaft coupling centering under the condition of not installing electric barring mechanism, the ring that reduces the reactor factory building hangs occupation time, high efficiency, the centering work of high-quality completion main pump motor, guarantee that the ring of other equipment such as reactor in the maintenance plan hangs the use, guarantee the smooth execution of unit overhaul plan, for shortening the overhaul period, improve the unit overhaul efficiency and make the contribution.

Description

Centering device for main pump and main pump motor of nuclear power station

Technical Field

The application belongs to the technical field of rotating equipment of nuclear power plants, and particularly relates to a centering device for a main pump and a main pump motor of the nuclear power plant.

Background

The nuclear power station main pump is used for establishing forced circulation of a coolant medium of a loop of a reactor to conduct heat of a reactor core, and a main pump motor matched with the nuclear power station main pump is a squirrel-cage alternating current double-speed asynchronous motor and weighs about 50 tons. According to the maintenance outline requirement of the main pump motors, 1 disassembly and overhaul needs to be carried out on 1 main pump motor in a single reactor refueling period, the upper cross frame of the main pump motor is supported and disassembled, the stator part and the rotor part are separated by using hoisting equipment, the disassembled parts are inspected, maintained and tested in electrical performance, and the parts are returned according to specific maintenance procedures after the technical parameter requirements are met. When the motor is installed again, the relative position between the rotor and the stator is determined by radial guide shoes in the upper and lower cross support structures of the main pump motor, and the height and the levelness of the rotor are required to be adjusted by a thrust shoe in the lower cross support structure of the main pump motor, so that the technical parameters of the main pump motor before and after maintenance are not kept consistent with the original parameters. Therefore, before the main pump is connected with the main pump motor, centering data of the main pump needs to be verified and adjusted, the concentricity and the parallelism of the main pump are guaranteed to be within the standard requirement range, otherwise, the vibration of the main pump or the main pump motor exceeds the standard, and the safe and stable operation of equipment is influenced.

Because of the particularity of the main pump motor structure, factors such as large rotor part quality and the like, an oil tank cover and an oil return chamber above a main pump motor need to be detached at present, a motor rotor can be driven only by installing an electric turning mechanism, the centering of a main pump and the main pump motor is realized, a ring crane in a nuclear island reactor hall is needed for the work, the ring crane serves as the only hoisting machine in the hall, the maintenance progress of other key equipment is seriously influenced by long-term occupation, the unit overhaul mainline plan is delayed, the unit power generation time is further shortened, and the economic benefit of a company is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a centering device for nuclear power station main pump and main pump motor, the centering of solving main pump and main pump motor occupies the maintenance progress that the ring in the nuclear island reactor hall seriously influences other key equipment for a long time, makes the unit overhaul thread plan lag, and then shortens the unit and generates electricity long time, influences the problem of company's economic benefits.

The technical scheme for realizing the purpose of the application is as follows:

the embodiment of the application provides a device that is used for nuclear power station main pump and main pump motor to centering, includes: the device comprises a connecting assembly, a rotating assembly and a measuring assembly;

the connecting assembly is fixedly connected with a motor rotor of a main pump motor and the rotating assembly respectively and used for coaxially fixing the motor rotor and the rotating assembly; the motor rotor, the connecting assembly and the rotating assembly are all positioned above a main pump bearing;

the rotating assembly is also connected with the measuring assembly and is used for changing the relative position of the motor rotor and a main pump bearing;

and the measuring component is used for measuring the concentricity and parallelism of the motor rotor and the main pump bearing.

Optionally, the rotating assembly includes: a rolling bearing and a connecting disc;

the central shaft is fixed inside the rolling bearing; the connecting disc is fixed outside the rolling bearing;

the central shaft and the connecting assembly are fixed through a central shaft bolt so that the connecting disc, the rolling bearing and the motor rotor are concentric;

the connecting disc is also fixedly connected with the measuring component.

Optionally, the rotating assembly further includes: at least 3 steel ball rollers;

the connecting disc is symmetrically provided with jackscrew holes which are in one-to-one correspondence with the steel ball rollers, and the steel ball rollers are arranged in the jackscrew holes;

at least 3 steel ball gyro wheels with coupling assembling's contact surface uniform contact, through the steel ball gyro wheel with coupling assembling's effort, antifriction bearing's rolling element and outer lane laminating, drunkenness play are laminated.

Optionally, the rolling bearing is an angular contact ball bearing.

Optionally, the steel ball roller is a bolt type steel ball roller.

Optionally, the measurement assembly includes: at least two sets of measuring arms; the at least two groups of measuring arms are symmetrically arranged on the connecting disc; the measuring arm includes: a connecting arm and a dial indicator;

the dial indicator is fixed on the outer edge of the connecting disc through the connecting arm;

and the dial indicator is used for measuring the concentricity and the parallelism of the connecting disc relative to the main pump bearing.

Optionally, the connecting arm includes a movable three-section connecting rod: the first connecting rod, the second connecting rod and the third connecting rod are connected with the first connecting rod;

one end of the first connecting rod is fixed with the connecting disc through a bolt, the other end of the first connecting rod is connected with one end of the second connecting rod, the other end of the second connecting rod is connected with one end of the third connecting rod, and the dial indicator is fixed at the other end of the third connecting rod;

an angle between the first connecting bar and the second connecting bar and an angle between the second connecting bar and the third connecting bar are variable.

Alternatively to this, the first and second parts may,

a plurality of measuring mark groups are arranged on a shell of the main pump bearing;

each measuring mark group comprises measuring marks which correspond to the dial indicators one by one, so that the dial indicators measure the concentricity of the motor rotor and the main pump bearing based on the measuring marks in the measuring mark groups.

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

the upper end of the torsion bar coupler is fixedly connected with the motor rotor through the clamp, and the torsion bar coupler is coaxial with the motor rotor;

the lower end of the torsion bar coupler is coaxially fixed with the rotating assembly.

The beneficial technical effect of this application lies in:

1) The centering device for the main pump and the main pump motor of the nuclear power station, which is provided by the embodiment of the application, has a simple structure and is convenient to use, and can be manufactured by means of standard part purchasing, machining and the like on the basis of completing design; partial disassembly of a main pump motor before centering can be avoided, extra workload caused by centering is avoided, and the occupation time of the ring crane is saved;

2) The centering device for the main pump and the main pump motor of the nuclear power station, provided by the embodiment of the application, can avoid using an external electric turning gear, and reduce the use of other electric tools; centering can be realized on the premise of not rotating the motor rotor, and damage to the thrust pad under the condition of abnormal lubrication working condition in the centering process is avoided;

3) The centering device for the main pump and the main pump motor of the nuclear power station, provided by the embodiment of the application, can reduce the requirement on external electric equipment, reduce industrial risks, shorten the working time, reduce the irradiation dose of maintainers, and improve the safety and reliability of field maintenance operation.

Drawings

Fig. 1 is a schematic structural diagram of a centering device for a main pump and a main pump motor of a nuclear power plant according to an embodiment of the present application.

In the figure:

1-a connecting assembly; 11-a central shaft bolt, 12-a torsion bar coupler and 13-a clamp;

2-a rotating assembly; 21-rolling bearing, 22-connecting disc, 23-steel ball roller, 24-bolt and 25-central shaft;

3-a measuring assembly; 31-connecting arm, 32-dial indicator;

4-a motor rotor;

5-main pump bearing.

Detailed Description

In order to make the technical solutions in the embodiments of the present application more clearly understood and fully described below by those skilled in the art, the technical solutions in the embodiments of the present application will be described with reference to the drawings in the embodiments of the present application. It should be apparent that the embodiments described below are only a part of the embodiments of the present application, and not all of them. All other embodiments that can be derived by a person skilled in the art from the embodiments described herein without inventive step are within the scope of the present application.

In order to solve the prior art problem, the embodiment of the application provides a centering device for nuclear power station main pump and main pump motor, moreover, the steam generator is simple in structure, the steam generator is convenient to disassemble and assemble, the upper oil tank and the oil return chamber of the main pump motor are not disassembled, the centering of a coupler is carried out under the condition that an electric barring mechanism is not installed, the occupation time of a reactor workshop in a ring hoisting process is reduced, the centering work of the main pump motor is completed at high efficiency and high quality, the ring hoisting of other equipment such as a reactor in an overhaul plan is guaranteed, the smooth execution of the unit overhaul plan is guaranteed, the contribution is made for shortening the overhaul period and improving the unit overhaul efficiency.

Based on the above, in order to clearly and specifically explain the above advantages of the present application, the following description of the embodiments of the present application will be made with reference to the accompanying drawings.

Referring to fig. 1, the drawing is a schematic structural diagram of a centering device for a main pump and a main pump motor of a nuclear power plant according to an embodiment of the present application.

The embodiment of this application provides a centering device for nuclear power station main pump and main pump motor includes: the device comprises a connecting assembly 1, a rotating assembly 2 and a measuring assembly 3;

the connecting assembly 1 is respectively and fixedly connected with a motor rotor 4 and a rotating assembly 2 of a main pump motor and is used for coaxially fixing the motor rotor 4 and the rotating assembly 2; the motor rotor 4, the connecting assembly 1 and the rotating assembly 2 are all positioned right above the main pump bearing 5;

the rotating assembly 2 is also connected with the measuring assembly 3 and is used for changing the relative position of the motor rotor 4 and the main pump bearing 5;

and the measuring component 3 is used for measuring the concentricity and the parallelism of the motor rotor 4 and the main pump bearing 5.

In a specific example, when the main pump motor performs disassembly and overhaul inspection, the motor rotor 4 is firstly adjusted 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 through the radial guide shoes symmetrically distributed in the upper cross support structure and the lower cross support structure, so that the deviation of the motor rotor in the transportation and hoisting processes is avoided. The connecting assembly 1 is fixed with a motor rotor 4 of a main pump motor, the motor rotor 4 is fixed at the center of a stator through a lower radial guide shoe, and the rotating assembly 2 is connected before the motor rotor is hoisted to a support above a main pump bearing 5.

It should be noted that, in practical applications, the radial guide shoe jackscrew on a certain main pump motor is located in a closed oil return chamber, which is inconvenient to operate, so the lower radial guide shoe is selected to fix the motor rotor 4 in the center, and other devices should be combined with their own structures to make reasonable selection in specific implementation, which is not listed here.

In the embodiment of the application, the rotating assembly 2 changes the relative position of the motor rotor 4 and the main pump bearing 5; the measuring component 3 measures the concentricity and the parallelism of the motor rotor 4 and the main pump bearing 5, and the rotating component 2 is utilized to change the relative positions of the motor rotor 4 and the main pump bearing 5 according to the measuring component 3, so that the motor rotor 4 and the main pump bearing 5 can be centered without disassembling an oil tank cover and an oil return chamber above the main pump motor, and the long-term occupation of a ring crane in a nuclear island reactor hall is avoided.

In the embodiment of the present application, the rotating assembly 2 may specifically include: rolling bearing 21, connecting disc 22, and center shaft 25;

the central shaft 25 is fixed inside the rolling bearing 21; the connecting disc 22 is fixed outside the rolling bearing 21;

the central shaft 25 and the connecting assembly 1 are fixed through a central shaft bolt 11, so that the connecting disc 22, the rolling bearing 21 and the motor rotor 4 are concentric;

the connecting disc 22 is also fixedly connected with the measuring assembly 3.

It will be appreciated that when the central shaft bolt 11 is used to connect the central shaft 25 to the connecting assembly 1, the connecting plate 22 is provided on the exterior of the rolling bearing 21, and the connecting plate 22 can rotate relative to the connecting assembly 1 and the motor rotor 4.

In some possible implementations of the embodiment of the present application, to avoid the influence of the play of the rolling bearing 21 on the rotation precision of the connecting disc 22, the rotating assembly 2 may further include: at least 3 steel ball rollers 23;

the connecting disc 22 is symmetrically provided with jackscrew holes corresponding to the steel ball rollers 23 one by one, and the steel ball rollers 23 are arranged in the jackscrew holes;

at least 3 steel ball rollers 23 evenly contact with the contact surface of the connecting component 1, and the rolling body and the outer ring of the rolling bearing 22 are attached and play and play are attached to each other under the action force of the steel ball rollers 23 and the connecting component 1.

As an example, the rolling bearing 22 may be embodied as an angular contact ball bearing.

In another example, the ball roller 23 may be embodied as a bolt-type ball roller.

In some possible implementations of the present application, the connection component 1 may specifically include: a torsion bar coupling 12 and a clasping 13;

the upper end of the torsion bar coupler 12 is fixedly connected with the motor rotor 4 through a clamp 13, and the torsion bar coupler 12 is coaxial with the motor rotor 4;

the lower end of the torsion bar coupling 12 is coaxially fixed with the rotating assembly 2.

In some possible implementation manners of the embodiment of the present application, the measuring component 3 may specifically include: at least two sets of measuring arms; at least two groups of measuring arms are symmetrically arranged on the connecting disc 22; a measurement arm comprising: a connecting arm 31 and a dial gauge 32;

the connecting arm 31 fixes the dial indicator 32 on the outer edge of the connecting disc 22;

and a dial gauge 32 for measuring concentricity and parallelism of the connecting disc 22 with respect to the main pump bearing 5.

In one particular example, the connecting arm 31 comprises a movable three-piece connecting rod: a first connecting bar 311, a second connecting bar 312, and a third connecting bar 313;

one end of the first connecting rod 311 is fixed with the connecting disc 312 through a bolt 24, the other end of the first connecting rod 311 is connected with one end of the second connecting rod 312, the other end of the second connecting rod 312 is connected with one end of the third connecting rod 313, and the other end of the third connecting rod 313 is fixed with the dial indicator 32;

the angle between the first connection bar 311 and the second connection bar 312 and the angle between the second connection bar 312 and the third connection bar 313 are variable.

In practical application, when measuring concentricity, the probes of the two dial indicators 32 are both in a horizontal direction, the offset is half of the difference between the measured data of the two dial indicators 32, and the moving direction is the radial outer direction of the corresponding position of the dial indicator 32 with a larger value; when the parallelism is measured, the probes of the two dial indicators 32 are both vertically upward, the offset is n times of the difference between the measured data of the two dial indicators 32, the moving direction is the axial upward direction corresponding to the dial indicators 32, and the value of n is the ratio of the radius of the parallelism adjusting position of the motor to the radius of gyration of the measuring position of the dial indicators 32.

In some possible implementations of the present application, a plurality of measurement mark groups are provided on the housing of the main pump bearing 5;

each measurement mark group includes measurement marks corresponding one-to-one to the dial indicators 32, so that the dial indicators 32 measure the concentricity of the motor rotor 4 and the main pump bearing 5 based on the measurement marks in the measurement mark group.

The following describes a specific installation method and a use method of the centering device for a main pump and a main pump motor of a nuclear power plant provided by the embodiment of the present application in detail with reference to a specific example.

1) After the main pump motor 4 is disassembled and maintained, the motor rotor 4 is fixed in the center of the stator through the lower radial guide shoe and lifted to the front of a bracket above the main pump, the torsion bar coupler 12 and the motor rotor 4 are effectively fixed, and the condition that the matching position cannot be changed is confirmed;

2) Heating the inner ring of the rolling bearing 21 by using a bearing heater, and installing the inner ring above the central shaft 25;

3) After the rolling bearing 21 returns to the normal temperature state, mounting the connecting disc 22 on the outer ring of the rolling bearing 21;

4) 3 steel ball rollers 23 are arranged in jackscrew holes uniformly distributed on the circumference of the connecting disc 22;

5) Fixing the combined body obtained in the steps 2) to 4) below the torsion bar coupling 12 by using a central shaft bolt 11;

6) Adjusting the installation depth of the steel ball roller 12 by using an inner hexagonal wrench to enable the steel ball roller to be in uniform contact with the lower end of the torsion bar coupler 12, slightly shaking the connecting disc 22 at the same time, determining that the rolling body and the outer ring of the rolling bearing 21 are attached under the reaction force of the steel ball roller 23 and the torsion bar coupler 12, and otherwise, continuously screwing the steel ball roller 23 until the play clearance of the rolling bearing 21 is completely attached; and a connecting arm 31 and a dial indicator 32 are erected 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.

7) Fixing the connecting arm 31 above the connecting disc 22 by using a bolt 24, and adjusting the horizontal length and the vertical height of the connecting arm 31 to enable the probe of the dial indicator 31 to touch a measuring position of the shell of the main pump bearing 5;

8) Uniformly drawing a plurality of marks at the measuring position of the shell of the main pump bearing 5, rotating the connecting disc 22 and recording the indication number of the dial indicator 32 corresponding to the marked position;

9) When measuring the concentricity, the probes of the two dial indicators 32 are in the horizontal direction, the offset is half of the difference between the measured data of the two dial indicators 32, and the moving direction is the radial outer direction of the corresponding position of the dial indicator 32 with a larger value;

10 When measuring the parallelism, the probes of the two dial indicators 32 are both vertically upward, the offset is n times of the difference between the measured data of the two dial indicators 32, the moving direction is the axial upward direction corresponding to the dial indicator 32, and the value of n is the ratio of the radius of the parallelism adjusting position of the motor to the radius of the gyration of the measuring position of the dial indicator 32;

11 Combining the data to adjust the installation position of the main pump motor, and after the adjustment is finished, performing retest and adjustment sequentially according to the steps 8) to 10) until the measured offset value is within the standard range required by the technical program;

12 Loosening the bolt 24, removing the connecting arm 31, detaching the center shaft bolt 11, taking out the center shaft 25 and the connecting disc 22 as a whole, and storing them at a designated position;

13 Release the lower radial shoe of the main pump motor and optionally connect the torsion bar coupling 12 to the upper butt position of the housing of the main pump bearing 5.

The operation of centering the main pump and the main pump motor can be completed under the condition that the rotor of the main pump motor is not rotated through the operation.

In the centering device for the main pump and the main pump motor of the nuclear power station, the central shaft 25 and the connecting disc 22 are connected together through the rolling bearing 21 and realize a relative rotation function, at the moment, the central shaft 25 and the connecting disc 22 are fastened below the torsion bar coupling 12 through the central shaft bolt 11, the motor rotor 4, the torsion bar coupling 12 and the rotating assembly 2 are concentrically arranged, the connecting arm 31 with proper length is fixed on the outer edge of the connecting disc 22, the specific numerical value of the relative position of the center of the shell of the main pump bearing 5 and the center of the motor rotor 4 can be measured through the connecting disc 228, a data basis is provided for the next concentricity and parallelism adjustment work, the numerical value of the motor offset is calculated through data and adjusted, and the centering work of the main pump and the main pump motor can be completed.

The present application has been described in detail with reference to the drawings and examples, but the present application 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 application. The prior art can be used for all the matters not described in detail in this application.

Claims (9)

1. A centering device for a main pump and a main pump motor of a nuclear power plant, characterized in that the device comprises: the device comprises a connecting assembly, a rotating assembly and a measuring assembly;

the connecting assembly is fixedly connected with a motor rotor of a main pump motor and the rotating assembly respectively and used for coaxially fixing the motor rotor and the rotating assembly; the motor rotor, the connecting assembly and the rotating assembly are all positioned above a main pump bearing;

the rotating assembly is also connected with the measuring assembly and is used for changing the relative position of the motor rotor and the main pump bearing;

the measuring component is used for measuring the concentricity and the parallelism of the motor rotor and the main pump bearing.

2. The centering device for a main pump and a main pump motor of a nuclear power plant as claimed in claim 1, wherein said rotating assembly comprises: a rolling bearing, a connecting disc and a central shaft;

the central shaft is fixed inside the rolling bearing; the connecting disc is fixed outside the rolling bearing;

the central shaft and the connecting assembly are fixed through a central shaft bolt so that the connecting disc, the rolling bearing and the motor rotor are concentric;

the connecting disc is also fixedly connected with the measuring component.

3. The centering device for a main pump and a main pump motor of a nuclear power plant as claimed in claim 2, wherein said rotating assembly further comprises: at least 3 steel ball rollers;

the connecting disc is symmetrically provided with jackscrew holes which are in one-to-one correspondence with the steel ball rollers, and the steel ball rollers are arranged in the jackscrew holes;

at least 3 steel ball gyro wheels with coupling assembling's contact surface uniform contact, through the steel ball gyro wheel with coupling assembling's effort, antifriction bearing's rolling element and outer lane laminating, drunkenness play are laminated.

4. The centering device for a main pump and a main pump motor of a nuclear power plant as claimed in claim 2, wherein said rolling bearing is an angular contact ball bearing.

5. The centering device for a main pump and a main pump motor of a nuclear power plant as claimed in claim 3, wherein said steel ball roller is a bolt-type steel ball roller.

6. The centering device for a main pump and a main pump motor of a nuclear power plant according to claim 2,

the measurement assembly, comprising: at least two sets of measuring arms; the at least two groups of measuring arms are symmetrically arranged on the connecting disc; the measuring arm includes: a connecting arm and a dial indicator;

the dial indicator is fixed on the outer edge of the connecting disc through the connecting arm;

and the dial indicator is used for measuring the concentricity and the parallelism of the connecting disc relative to the main pump bearing.

7. The centering device for a main pump and a main pump motor of a nuclear power plant as claimed in claim 6, wherein said connecting arm comprises a movable three-segment connecting rod: the first connecting rod, the second connecting rod and the third connecting rod;

one end of the first connecting rod is fixed with the connecting disc through a bolt, the other end of the first connecting rod is connected with one end of the second connecting rod, the other end of the second connecting rod is connected with one end of the third connecting rod, and the dial indicator is fixed at the other end of the third connecting rod;

an angle between the first connecting rod and the second connecting rod and an angle between the second connecting rod and the third connecting rod are variable.

8. The centering device for a main pump and a main pump motor of a nuclear power plant according to claim 6,

a plurality of measuring mark groups are arranged on a shell of the main pump bearing;

each measuring mark group comprises measuring marks which correspond to the dial indicators one by one, so that the dial indicators measure the concentricity of the motor rotor and the main pump bearing based on the measuring marks in the measuring mark groups.

9. The centering device for a main pump and a main pump motor of a nuclear power plant as claimed in claim 1, wherein said connection assembly comprises: a torsion bar coupling and a clamp;

the upper end of the torsion bar coupler is fixedly connected with the motor rotor through the clamp, and the torsion bar coupler is coaxial with the motor rotor;

the lower end of the torsion bar coupler is coaxially fixed with the rotating assembly.

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