Calibration device for displacement sensor of main pump shaft of nuclear power plant

Abstract

The invention particularly relates to a nuclear power plant main pump shaft displacement sensor verification device. The nuclear power plant main pump shaft displacement sensor verification device comprises a device body, a miniature notebook computer, an induction block, a sensor clamp, a driving device, an ejector pin type digital display dial gauge and a voltage measurement card, a control system is arranged on the micro notebook computer; the sensor clamp is fixedly arranged on the driving device and is in threaded rotation connection with a probe of the shaft displacement sensor; the induction block is connected with the driving device through a sliding screw rod; the ejector pin type digital display dial indicator is connected with the sensor clamp through threads and a sliding groove; the voltage measuring card is used for measuring output voltage of the shaft displacement sensor and sending the output voltage to the control system; the digital display dial indicator is used for measuring an actual displacement value between the sensing block and the shaft displacement sensor and sending the actual displacement value to the control system; and the control system is used for executing the checking process of the shaft displacement sensor. According to the invention, simple and effective field calibration work of the displacement sensor of the main pump shaft of the nuclear power plant is realized.

Description

Technical Field

[0001] The invention relates to the technical field of operation and maintenance of nuclear power plants, and in particular to a calibration device for a main pump shaft displacement sensor of a nuclear power plant. Background Art

[0002] In the main pump monitoring system of a nuclear power plant, the shaft displacement parameters of the main pump are crucial and must be monitored in real time. However, most shaft displacement sensors use eddy current sensors, which inevitably have some errors after being used for a period of time. Therefore, the calibration results of the shaft displacement sensor directly affect the operating safety of the main pump of a nuclear power plant.

[0003] There are some problems with existing sensor calibration equipment, which cannot simply and effectively realize the calibration of the main pump shaft displacement sensor of the nuclear power plant. For example, some sensor calibration equipment has low accuracy and cannot meet the calibration standards; some sensor calibration equipment is too bulky and difficult to carry, and cannot be used on site; some sensor calibration equipment has imperfect data storage methods and cannot guarantee the integrity and security of the calibration data; some sensor calibration equipment calibration data reports cannot effectively display the problems of the sensor, and cannot timely feedback warning information. Summary of the invention

[0004] Based on this, it is necessary to provide a nuclear power plant main pump shaft displacement sensor calibration device to address the problem that the existing sensor calibration equipment cannot simply and effectively realize the calibration work of the nuclear power plant main pump shaft displacement sensor, so as to realize simple and effective on-site calibration of the nuclear power plant main pump shaft displacement sensor.

[0005] In order to solve the above problems, the present invention provides the following technical solutions:

[0006] A nuclear power plant main pump shaft displacement sensor calibration device, comprising a device body and a miniature laptop computer installed inside the device body, a sensing block, a sensor fixture, a driving device, a thimble-type digital display multimeter and a voltage measurement card;

[0007] The control system is installed on the mini laptop computer; the sensor fixture is fixedly installed on the driving device and is rotatably connected with the probe thread of the shaft displacement sensor; the induction block is connected with the driving device through a sliding screw; the thimble-type digital display multimeter is connected with the sensor fixture through a thread and a slide groove;

[0008] The voltage measurement card is used to measure the output voltage of the shaft displacement sensor and send it to the control system; the digital multimeter is used to measure the actual displacement value between the induction block and the shaft displacement sensor and send it to the control system;

[0009] The control system is used to set the shaft displacement sensor information and the test step length; control the driving device to drive the sensing block to move axially according to the set test step length to simulate the displacement change of the main pump shaft; calculate the displacement value between the sensing block and the shaft displacement sensor according to the output voltage of the shaft displacement sensor; compare the calculated displacement value between the sensing block and the shaft displacement sensor with the actual displacement value to verify the linear range of the shaft displacement sensor; generate a report according to the set shaft displacement sensor information and the verified linear range of the shaft displacement sensor.

[0010] In the present invention, the driving device is an electric cylinder structure, including a ball screw and a driving motor; a sensor fixture is installed on the fixed side of the driving device, and a sensing block is installed on the slider of the ball screw.

[0011] In the present invention, the nuclear power plant main pump shaft displacement sensor calibration device also includes a power module and a charger installed inside the device body; the power module includes a DC power supply and a backup lithium battery; the micro notebook computer, the drive motor and the voltage measurement card are powered by AC power or a DC power supply or a backup lithium battery; the DC power supply and the backup lithium battery are both modularly designed.

[0012] In the present invention, a three-layer frame composed of rib plates is detachably provided inside the device body; a miniature laptop is threadedly installed on the top frame, and a backup lithium battery is threadedly installed on the middle frame; a DC power supply and a voltage measurement card are threadedly installed on the left side of the bottom frame, and a driving device is threadedly installed on the right side; the induction block and the sensor fixture are installed on the driving device, and a pin-type digital display multimeter is installed on the sensor fixture.

[0013] In the present invention, the device body is a suitcase-type structure with a lightweight design; a power module replacement window and a transparent observation window are reserved on the device body; the power module replacement window is used to replace the power module; and the transparent observation window is used to observe the displacement value measured by the thimble-type digital display multimeter.

[0014] In the present invention, the device body is made of aviation aluminum profiles processed by a CNC center, and the surface is anodized.

[0015] In the present invention, the thimble-type digital display multimeter is a grating displacement sensor, which communicates with the control system through a USB interface or an RS232 interface.

[0016] In the present invention, the induction block is made of bearing steel.

[0017] In the present invention, the control system is provided with an axis displacement sensor verification process; the axis displacement sensor verification process is constructed based on C# language and WPF framework, and a visual operation interface is adopted to realize one-key start of the axis displacement sensor verification process.

[0018] In the present invention, the shaft displacement sensor calibration process includes:

[0019] The device is powered on, and the driving device drives the induction block to move to the zero position;

[0020] Install the shaft displacement sensor on the sensor fixture so that the probe sticks to the sensing block, which is the zero point of the sensing block; make the thimble-type digital multimeter stick to the sensing block;

[0021] The device is powered off, and the power supply and power supply signal are connected; the device is powered on again;

[0022] Set the axis displacement sensor information and test step length in the visual operation interface;

[0023] Start the axis displacement sensor calibration;

[0024] The control system controls the driving device to drive the sensing block to move axially three times according to the set test step length; the voltage measurement card measures the output voltage of the shaft displacement sensor and sends it to the control system; the digital multimeter measures the actual displacement value between the sensing block and the shaft displacement sensor and sends it to the control system;

[0025] The control system calculates the displacement value between the sensing block and the shaft displacement sensor according to the output voltage of the shaft displacement sensor; compares the calculated displacement value between the sensing block and the shaft displacement sensor with the actual displacement value to verify the linear range of the shaft displacement sensor; and generates a report according to the set shaft displacement sensor information and the verified linear range of the shaft displacement sensor.

[0026] Beneficial technical effects of the present invention:

[0027] The nuclear power plant main pump shaft displacement sensor calibration device of the present invention has a suitcase-type structure as the main body of the device to ensure portability; the main body of the device is made of high-strength aviation aluminum profiles processed by a CNC center, and the surface is anodized to ensure lightness and strength; a power module replacement window and a transparent observation window are reserved on the main body of the device to facilitate replacement of the power module and observation of the displacement value measured by a pin-type digital display micrometer; a replaceable power module is configured to meet the needs of continuous operation of the device; the driving device is a micro-electric cylinder structure, which can subtly simulate the changes in the main pump shaft displacement to ensure the stability of the working conditions; a report is generated according to the set shaft displacement sensor information and the calibrated shaft displacement sensor linear range, so that the operation and maintenance personnel can replace or repair the shaft displacement sensor in time according to the calibration results displayed in the report; the calibration of the main pump shaft displacement sensor is completed simply and effectively, reducing labor costs; the accuracy of the device is 0.5%, and the positioning accuracy is ±10μm, which meets the calibration requirements of the main pump shaft displacement sensor of the nuclear power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the appearance of an embodiment of a nuclear power plant main pump shaft displacement sensor calibration device of the present invention;

[0029] Figure 2 It is an axonometric diagram of an embodiment of a nuclear power plant main pump shaft displacement sensor calibration device of the present invention;

[0030] Figure 3 It is a front view of an embodiment of a nuclear power plant main pump shaft displacement sensor calibration device of the present invention;

[0031] Figure 4 A top view of an embodiment of a nuclear power plant main pump shaft displacement sensor calibration device of the present invention;

[0032] Figure 5 The present invention is a flow chart of an embodiment of a shaft displacement sensor calibration process.

[0033] In the figure, 1. micro laptop computer; 2. induction block; 3. sensor fixture; 4. 8mm probe of shaft displacement sensor; 5. 5mm probe of shaft displacement sensor; 6. driving device; 7. thimble-type digital multimeter; 8. voltage measurement card; 9. DC power supply; 10. spare lithium battery. DETAILED DESCRIPTION

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0035] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] The technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.

[0037] In a nuclear power plant, an extremely important monitoring object of the main pump monitoring system is the rotation status monitoring of the main pump shaft. As a part of the main pump monitoring system, the shaft displacement sensor is distributed near the shaft of the main pump, responsible for real-time acquisition of the offset of the main pump shaft during rotation, and transmitting the lateral and longitudinal offsets of the main pump shaft during rotation in the form of voltage to the back-end transmitter for calculation of the main pump shaft rotation status, and then displaying the results on the monitor. The operation and maintenance personnel observe the rotation status of the main pump shaft through the results displayed on the monitor. The function of the shaft displacement sensor directly affects the safe operation of the main pump.

[0038] According to the regulations of the nuclear power plant, the shaft displacement sensor needs to be replaced regularly and sent to the designated measurement unit for calibration. After the calibration, the shaft displacement sensor is installed back near the main pump shaft. This set of procedures is time-consuming and labor-intensive, and it also introduces uncertain human factors, which brings hidden dangers to the operation monitoring of the main pump.

[0039] This embodiment provides a nuclear power plant main pump shaft displacement sensor calibration device, which realizes simple and effective on-site calibration of the nuclear power plant main pump shaft displacement sensor, shortens the nuclear power plant main pump shaft displacement sensor calibration time, and reduces human errors.

[0040] See also Figure 1-4 The nuclear power plant main pump shaft displacement sensor calibration device described in this embodiment includes a device body and a miniature laptop computer 1 installed inside the device body, a sensor block 2, a sensor fixture 3, a drive device 6, a thimble-type digital display multimeter 7 and a voltage measurement card 8;

[0041] The control system is installed on the mini notebook computer 1; the sensor fixture 3 is fixedly installed on the driving device 6 and is rotatably connected with the probe thread of the shaft displacement sensor; the induction block 2 is connected with the driving device 6 through a sliding screw; the thimble-type digital display multimeter 7 is connected with the sensor fixture 3 through a thread and a slide groove;

[0042] The voltage measurement card 8 is used to measure the output voltage of the shaft displacement sensor and send it to the control system; the digital display micrometer 7 is used to measure the actual displacement value between the induction block 2 and the shaft displacement sensor and send it to the control system;

[0043] The control system is used to set the shaft displacement sensor information and the test step length; control the driving device 6 to drive the sensing block 2 to move axially according to the set test step length to simulate the displacement change of the main pump shaft; calculate the displacement value between the sensing block 2 and the shaft displacement sensor according to the output voltage of the shaft displacement sensor; compare the calculated displacement value between the sensing block 2 and the shaft displacement sensor with the actual displacement value to verify the linear range of the shaft displacement sensor; generate a report according to the set shaft displacement sensor information and the verified linear range of the shaft displacement sensor.

[0044] In this embodiment, the driving device 6 is a micro electric cylinder structure, including a micro precision ball screw and a driving motor; the sensor fixture 3 is installed on the fixed side of the driving device 6, and the sensing block 2 is installed on the slider of the micro precision ball screw.

[0045] In this embodiment, the nuclear power plant main pump shaft displacement sensor calibration device also includes a power module and two chargers installed inside the device body to meet the needs of continuous operation of the device; the power module includes two DC power supplies 9 and a backup lithium battery 10; the micro notebook computer 1, the drive motor and the voltage measurement card 8 are powered by AC power or the DC power supply 9 or the backup lithium battery 10; the DC power supply 9 and the backup lithium battery 10 are both modularly designed to facilitate replacement.

[0046] In this embodiment, a three-layer frame composed of rib plates is detachably provided inside the main body of the device; a mini laptop computer 1 is threadedly installed on the top frame, and two backup lithium batteries 10 are threadedly installed on the middle frame; a DC power supply 9 and a voltage measurement card 8 are threadedly installed on the left side of the bottom frame, and a driving device 6 is threadedly installed on the right side; the induction block 2 and the sensor fixture 3 are installed on the driving device 6, and a pin-type digital display micrometer 7 is installed on the sensor fixture 3.

[0047] In this embodiment, the device body is a suitcase-type structure, which is convenient for carrying; a power module replacement window and a transparent observation window are reserved on the device body; the power module replacement window is used to replace the power module; the transparent observation window is used to observe the displacement value measured by the pin-type digital micrometer 7; in order to reduce the weight of the device and ensure the strength of the device, the device body is made of high-strength aviation aluminum profiles processed by a CNC center, and the surface is anodized.

[0048] In this embodiment, the thimble-type digital display micrometer 7 is a high-precision grating displacement sensor with stable measurement data and is not easily interfered by external signals; the axial displacement sensor and the thimble-type digital display micrometer 7 both communicate with the control system through a USB interface or an RS232 interface.

[0049] In this embodiment, the induction block 2 is made of bearing steel.

[0050] In this embodiment, the control system is provided with an axis displacement sensor verification process; the axis displacement sensor verification process is constructed based on C# language and WPF framework, and adopts a visual operation interface to realize one-key start of the axis displacement sensor verification process.

[0051] In this embodiment, the shaft displacement sensor probe includes an 8mm probe and a 5mm probe.

[0052] See also Figure 5 In this embodiment, the shaft displacement sensor calibration process includes:

[0053] The device is powered on, and the driving device 6 drives the induction block 2 to move to the zero position;

[0054] Install the shaft displacement sensor on the sensor fixture 3, so that the probe is attached to the sensing block 2, which is the zero point of the sensing block 2; make the thimble-type digital display multimeter 7 stand against the sensing block 2;

[0055] The device is powered off, and the power supply and power supply signal are connected; the device is powered on again;

[0056] Set the axis displacement sensor information and test step length in the visual operation interface;

[0057] Start the axis displacement sensor calibration;

[0058] The control system controls the driving device 6 to drive the sensing block 2 to move axially three times according to the set test step length; the voltage measurement card 8 measures the output voltage of the shaft displacement sensor and sends it to the control system; the digital multimeter 7 measures the actual displacement value between the sensing block 2 and the shaft displacement sensor and sends it to the control system;

[0059] The control system calculates the displacement value between the sensing block 2 and the shaft displacement sensor according to the output voltage of the shaft displacement sensor; compares the calculated displacement value between the sensing block 2 and the shaft displacement sensor with the actual displacement value to verify the linear range of the shaft displacement sensor; generates a report according to the set shaft displacement sensor information and the verified linear range of the shaft displacement sensor.

[0060] In this embodiment, according to the on-site calibration requirements of the main pump shaft displacement sensor of the nuclear power plant, the accuracy of the calibration device of the main pump shaft displacement sensor of the nuclear power plant is 0.5%, and the linear range of the shaft displacement sensor is ±2mm; the positioning accuracy of the calibration device of the main pump shaft displacement sensor of the nuclear power plant is calculated according to the following formula:

[0061] σ=L max ×Δ pe = (±2mm) × (0.5%) = ±10μm

[0062] Wherein, σ is the positioning accuracy of the main pump shaft displacement sensor calibration device of the nuclear power plant, that is, the maximum allowable positioning error of the main pump shaft displacement sensor calibration device of the nuclear power plant; L max is the linear range of the shaft displacement sensor, that is, the linear range of the shaft displacement sensor; Δ pe It is the accuracy of the calibration device for the main pump shaft displacement sensor of a nuclear power plant, that is, the allowable relative error percentage of the linear range of the calibrated shaft displacement sensor.

[0063] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A nuclear power plant main pump shaft displacement sensor calibration device, characterized in that: It comprises a device body and a miniature notebook computer (1) installed inside the device body, a sensing block (2), a sensor fixture (3), a driving device (6), a thimble-type digital display multimeter (7) and a voltage measurement card (8); A control system is installed on a miniature notebook computer (1); a sensor fixture (3) is fixedly installed on a driving device (6) and is rotatably connected to a probe of an axial displacement sensor by a thread; a sensing block (2) is connected to the driving device (6) by a sliding screw; a thimble-type digital display multimeter (7) is connected to the sensor fixture (3) by a thread and a slide groove; The voltage measurement card (8) is used to measure the output voltage of the shaft displacement sensor and send it to the control system; the pin-type digital display multimeter (7) is used to measure the actual displacement value between the induction block (2) and the shaft displacement sensor and send it to the control system; The control system is used to set shaft displacement sensor information and a test step length; control a driving device (6) to drive a sensing block (2) to move axially according to the set test step length; calculate a displacement value between the sensing block (2) and the shaft displacement sensor according to an output voltage of the shaft displacement sensor; compare the calculated displacement value between the sensing block (2) and the shaft displacement sensor with an actual displacement value to verify a linear range of the shaft displacement sensor; and generate a report according to the set shaft displacement sensor information and the verified linear range of the shaft displacement sensor.

2. The nuclear power plant main pump shaft displacement sensor calibration device according to claim 1, characterized in that: The driving device (6) is an electric cylinder structure, comprising a ball screw and a driving motor; a sensor fixture (3) is installed on the fixed side of the driving device (6), and a sensing block (2) is installed on the slider of the ball screw.

3. The nuclear power plant main pump shaft displacement sensor calibration device according to claim 2, characterized in that: The device also includes a power module and a charger installed inside the device body; the power module includes a DC power supply (9) and a backup lithium battery (10); the miniature notebook computer (1), the drive motor and the voltage measurement card (8) are powered by the mains or the DC power supply (9) or the backup lithium battery (10); the DC power supply (9) and the backup lithium battery (10) are both modularly designed.

4. The nuclear power plant main pump shaft displacement sensor calibration device according to claim 3, characterized in that: A three-layer frame composed of rib plates is detachably provided inside the main body of the device; a miniature laptop computer (1) is threadedly mounted on the top frame, and a backup lithium battery (10) is threadedly mounted on the middle frame; a DC power supply (9) and a voltage measurement card (8) are threadedly mounted on the left side of the bottom frame, and a driving device (6) is threadedly mounted on the right side; a sensing block (2) and a sensor fixture (3) are mounted on the driving device (6), and a pin-type digital display multimeter (7) is mounted on the sensor fixture (3).

5. The nuclear power plant main pump shaft displacement sensor calibration device according to claim 3, characterized in that: The device body is a suitcase-type structure and adopts a lightweight design; a power module replacement window and a transparent observation window are reserved on the device body; the power module replacement window is used to replace the power module; and the transparent observation window is used to observe the displacement value measured by a pin-type digital display multimeter (7).

6. The nuclear power plant main pump shaft displacement sensor calibration device according to claim 5, characterized in that: The main body of the device is made of aviation aluminum profiles processed by a CNC center, and the surface is anodized.

7. The nuclear power plant main pump shaft displacement sensor calibration device according to claim 1, characterized in that: The pin-type digital display multimeter (7) is a grating displacement sensor and communicates with the control system via a USB interface or an RS232 interface.

8. The nuclear power plant main pump shaft displacement sensor calibration device according to claim 1, characterized in that: The induction block (2) is made of bearing steel.

9. The nuclear power plant main pump shaft displacement sensor calibration device according to claim 1, characterized in that: The control system is equipped with an axis displacement sensor calibration process; the axis displacement sensor calibration process is constructed based on C# language and WPF framework, and adopts a visual operation interface to realize one-button start of the axis displacement sensor calibration process.

10. The nuclear power plant main pump shaft displacement sensor calibration device according to claim 9, characterized in that: The shaft displacement sensor calibration process includes: The device is powered on, and the driving device (6) drives the sensing block (2) to move to the zero point; The shaft displacement sensor is mounted on the sensor fixture (3) so that the probe is attached to the sensing block (2), which is the zero point of the sensing block (2); and the pin-type digital multimeter (7) is attached to the sensing block (2); The device is powered off, and the power supply and power supply signal are connected; the device is powered on again; Set the axis displacement sensor information and test step length in the visual operation interface; Start the axis displacement sensor calibration; The control system controls the driving device (6) to drive the sensing block (2) to move axially three times according to the set test step length; the voltage measurement card (8) measures the output voltage of the shaft displacement sensor and sends it to the control system; the digital multimeter (7) measures the actual displacement value between the sensing block (2) and the shaft displacement sensor and sends it to the control system; The control system calculates the displacement value between the sensing block (2) and the shaft displacement sensor according to the output voltage of the shaft displacement sensor; compares the calculated displacement value between the sensing block (2) and the shaft displacement sensor with the actual displacement value to verify the linear range of the shaft displacement sensor; and generates a report according to the set shaft displacement sensor information and the verified linear range of the shaft displacement sensor.

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