Testing device for vibration monitoring system of rotary mechanical equipment

Abstract

The invention provides a rotary mechanical equipment vibration monitoring system test device which comprises a rotary body, the rotary body comprises a main shaft, the main shaft is provided with an inertia wheel, the upper side and the lower side of the inertia wheel are provided with an upper bearing seat and a lower bearing seat respectively, and the upper bearing seat and the lower bearing seat both penetrate through the main shaft. An X speed sensor and a Y speed sensor which form a 90-degree angle are respectively installed on the main shaft, a thrust bearing is further arranged below the main shaft, a Z-direction speed sensor parallel to the axial direction of the main shaft is installed on a thrust bearing installation seat, a speed regulation motor is further arranged on the lower portion of the main shaft, an X acceleration sensor and a Y acceleration sensor which form a 90-degree angle are installed on an installation shaft of the speed regulation motor, and a Z-direction speed sensor parallel to the axial direction of the main shaft is installed on the installation shaft of the speed regulation motor. According to the test device, quantitative analysis data of vibration of a coolant main pump, a control rod driving mechanism fan and other rotary mechanical equipment in a normal state and an accident state can be simulated, and the dynamic balance repair effect can be visually observed in an actual maintenance method for vibration over-limit faults of the coolant main pump, the fan and other equipment.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear equipment monitoring, in particular to a vibration monitoring system test device for a nuclear power plant coolant pump and a control rod drive mechanism fan. Background Art

[0002] The coolant pump of a nuclear power plant involves key technologies of nuclear power plants. The reactor coolant pump vibration monitoring system is a continuous monitoring system. Its main function is to monitor the vibration level of the reactor coolant pump and provide information that helps to evaluate the vibration status of the canned motor pump. The main function of the control rod drive mechanism fan vibration monitoring system is to process the signal of the vibration sensor on the control rod drive mechanism fan and monitor the vibration level of the control rod drive mechanism fan.

[0003] However, the current vibration monitoring of rotating machinery coolant pumps and control rod drive mechanism fans lacks data on the vibration status of the equipment, making it impossible to conduct quantitative analysis of the vibration of the monitored object. Summary of the invention

[0004] The purpose of the present invention is to provide a test device for a vibration monitoring system of a rotating mechanical equipment, which can simulate the quantitative analysis data of the vibration of a coolant main pump and a control rod drive mechanism fan in normal and accident states. In the actual maintenance method of the vibration over-limit fault of the coolant main pump, the effect of the dynamic balancing repair can be observed intuitively.

[0005] The technical solution of the present invention is as follows: A test device for a vibration monitoring system of a rotating mechanical equipment comprises a rotating body, the rotating body comprises a main shaft, an inertia wheel is arranged on the main shaft, the main shaft passes through the upper and lower end faces of the inertia wheel, and the upper and lower sides of the inertia wheel are respectively provided with an upper bearing seat and a lower bearing seat both passing through the main shaft, two X-speed sensors and Y-speed sensors which are 90° to each other are respectively installed on the upper bearing seat and the lower bearing seat, a thrust bearing which passes through the main shaft is also arranged below the lower bearing seat, the thrust bearing is fixed on the thrust bearing mounting seat, a Z-direction speed sensor which is parallel to the main shaft axis is installed on the thrust bearing mounting seat, the upper bearing seat, the lower bearing seat and the thrust bearing mounting seat are fixed on the bracket, a speed regulating motor is also arranged at the lower part of the main shaft, and two X and Y acceleration sensors which are 90° to each other are installed on the mounting shaft of the speed regulating motor for monitoring the vibration state of the speed regulating motor.

[0006] Preferably, a phase monitoring flange is further provided between the upper bearing seat and the lower bearing seat.

[0007] Preferably, a phase sensor is also installed on the phase monitoring flange.

[0008] Preferably, a expansion sleeve is also provided on the main shaft.

[0009] Preferably, the speed regulating motor is connected to the main shaft via a coupling.

[0010] Preferably, a counterweight hole is also provided on the inertia wheel.

[0011] Preferably, the counterweight holes are distributed along the circumference of the inertia wheel.

[0012] The technical solution of the present invention has at least the following beneficial effects: (1) It can simulate the quantitative analysis data of the vibration of the coolant main pump and the control rod drive mechanism fan in the normal state and the accident state, and realize the monitoring state simulated by the monitoring system test device of the present invention by adding counterweights of different masses at specific angular positions on the inertia wheel.

[0013] (2) In the actual repair method for the vibration limit failure of the coolant main pump, the effect of dynamic balancing repair can be observed intuitively.

[0014] (3) Application of expansion sleeves and thrust bearings in the structure of the test device of the monitoring system of the present invention. The use of expansion sleeves can simplify the tight fit of the main shaft, and no longer need to consider the interference, processing accuracy, installation position accuracy, installation operation difficulties, etc., which reduces the processing difficulty. The use of thrust bearings can withstand axial loads and change the horizontal structure of the test device into a vertical structure.

[0015] (4) The shaft performs rotational motion driven by the speed regulating motor, and the sensors installed on it collect shaft vibration signals and phase reference signals, thereby simulating steady-state vibration data collection of the coolant main pump and fan, abnormal vibration data collection (mainly dynamic imbalance state and impact state), and speed and phase angle data collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural diagram of the test device of the vibration monitoring system of the rotating mechanical equipment of the present invention;

[0017] Figure 2 This is a structural diagram of the inertia wheel of the test device for the vibration monitoring system of the rotating mechanical equipment of the present invention;

[0018] Figure markings: main shaft-1, inertia wheel-2, upper bearing seat-3, lower bearing seat-4, thrust bearing-5, thrust bearing mounting seat-6, bracket-7, speed regulating motor-8, phase monitoring flange-9, phase sensor-10, expansion sleeve-11, coupling-12, counterweight hole-13, X-speed sensor-14, Y-speed sensor-15, Z-direction speed sensor-16. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1-2 As shown, a test device for a vibration monitoring system of a rotating mechanical device comprises a rotating body, wherein the rotating body comprises a main shaft 1, wherein the main shaft 1 is provided with an inertia wheel 2, wherein the main shaft 1 passes through the upper and lower end surfaces of the inertia wheel 2, and the upper and lower sides of the inertia wheel 2 are respectively provided with an upper bearing seat 3 and a lower bearing seat 4 both passing through the main shaft 1, wherein the upper bearing seat 3 and the lower bearing seat 4 are respectively provided with two X-speed sensors 14 and Y-speed sensors 15 which are 90° to each other, and the lower bearing seat 4 has a lower surface. A thrust bearing 5 passing through the main shaft 1 is also provided, and the thrust bearing 5 is fixed on the thrust bearing mounting seat 6. A Z-direction speed sensor 16 parallel to the axis of the main shaft 1 is installed on the thrust bearing mounting seat 6. The upper bearing seat 3, the lower bearing seat 4, and the thrust bearing mounting seat 6 are fixed on the bracket 7. A speed regulating motor 8 is also provided at the lower part of the main shaft 1. Two X and Y acceleration sensors with an angle of 90° to each other are installed on the mounting shaft of the speed regulating motor 8 to monitor the vibration state of the speed regulating motor 8. A phase monitoring flange 9 is also provided between the upper bearing seat 3 and the lower bearing seat 4. A phase sensor 10 is also installed on the phase monitoring flange 9. A clamping sleeve 11 is also provided on the main shaft 1. The speed regulating motor 8 is connected to the main shaft 1 through a coupling 12. A counterweight hole 13 is also provided on the inertia wheel 2. The counterweight holes 13 are distributed along the circumference of the inertia wheel 2.

[0021] In a specific implementation, a test device for a vibration monitoring system of a rotating mechanical equipment is divided into two parts, an upper part and a lower part. The lower speed regulating motor simulates a control rod drive mechanism fan and is equipped with two X and Y acceleration sensors at 90°±5° to each other for monitoring the vibration state of the speed regulating motor. The upper rotating body simulates a coolant main pump, and two X and Y velocity sensors at 90°±5° to each other are installed on each of the two bearing seats for monitoring radial vibration. A Z-direction velocity sensor parallel to the axial direction is installed on the mounting seat of the thrust bearing for monitoring axial vibration.

[0022] A phase monitoring flange is installed between two bearings on the main shaft, and a short-range eddy current phase sensor is installed on the model bracket to monitor the main shaft speed and main phase.

[0023] The specific experiment includes the following steps:

[0024] (1) Steady-state data recording and analysis

[0025] After repeated dynamic balancing tests, the test device is debugged to the optimal operating state, and the monitored operating data is saved. The monitoring data within two minutes of the optimal operating state is intercepted for analysis to obtain the steady-state operating parameters of the benchmark test device.

[0026] (2) Alarm threshold setting

[0027] According to the benchmark data, set the alarm threshold. The first-level alarm threshold for the axial and radial vibration of the coolant pump is 1.5 times the benchmark value, and the second-level alarm threshold is 2 times the benchmark value; the main pump speed should be determined according to the maximum speed of the main pump provided by the main pump manufacturer. The first-level alarm threshold for the acceleration vibration alarm of the control rod drive mechanism fan is 1.5 times the benchmark value, and the second-level alarm threshold is 2 times the benchmark value.

[0028] (3) Alarm function verification

[0029] Install configuration blocks of different weights in the counterweight hole of the inertia wheel, start the model, observe the vibration status and alarm status, record the monitoring data, and if the first-level alarm is triggered and the second-level alarm is not triggered, it means that the first-level alarm function of the system is normal.

[0030] In a specific implementation, the most basic and most commonly used maintenance method for the vibration over-limit fault of the coolant main pump is dynamic balancing repair. Using the test device of the present invention, a counterweight is added to the counterweight hole of the inertia wheel to perform a dynamic balancing repair test, and the effect of the dynamic balancing repair can be observed intuitively.

Claims

1. A test device for a vibration monitoring system of a rotating mechanical device, comprising a rotating body, characterized in that: The rotating body comprises a main shaft (1), on which an inertia wheel (2) is arranged, the main shaft (1) passes through the upper and lower end surfaces of the inertia wheel (2), and an upper bearing seat (3) and a lower bearing seat (4) are respectively arranged on the upper and lower sides of the inertia wheel (2), both of which pass through the main shaft (1), and two X-speed sensors and Y-speed sensors are respectively installed on the upper bearing seat (3) and the lower bearing seat (4) at 90 degrees to each other, and a thrust bearing passing through the main shaft (1) is also arranged below the lower bearing seat (4). (5), the thrust bearing (5) is fixed on the thrust bearing mounting seat (6), a Z-direction speed sensor parallel to the axis of the main shaft (1) is mounted on the thrust bearing mounting seat (6), the upper bearing seat (3), the lower bearing seat (4) and the thrust bearing mounting seat (6) are fixed on the bracket (7), a speed regulating motor (8) is also arranged at the lower part of the main shaft (1), and two X and Y acceleration sensors with an angle of 90° to each other are mounted on the mounting shaft of the speed regulating motor (8) for monitoring the vibration state of the speed regulating motor (8).

2. A rotating machinery equipment vibration monitoring system test device according to claim 1, characterized in that: A phase monitoring flange (9) is also provided between the upper bearing seat (3) and the lower bearing seat (4).

3. A rotating machinery equipment vibration monitoring system test device according to claim 2, characterized in that: A phase sensor (10) is also mounted on the phase monitoring flange (9).

4. A rotating machinery equipment vibration monitoring system test device according to claim 1, characterized in that: A tightening sleeve (11) is also provided on the main shaft (1).

5. A rotating machinery equipment vibration monitoring system test device according to claim 1, characterized in that: The speed regulating motor (8) is connected to the main shaft (1) via a coupling (12).

6. A rotating machinery equipment vibration monitoring system test device according to claim 1, characterized in that: The inertia wheel (2) is also provided with a counterweight hole (13).

7. A rotating machinery equipment vibration monitoring system test device according to claim 7, characterized in that: The counterweight holes (13) are distributed along the circumference of the inertia wheel (2).

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