Calibration Device and Calibration Method

Abstract

The present invention relates to a calibration device and a calibration method for calibrating a rotational speed sensor of a main pump spindle. A probe is provided on the outer wall surface of the main pump spindle. At one end of the rotational speed sensor opposite to the main pump spindle, there is a sensing groove penetrating along the circumferential direction for the probe to rotate through. The calibration device includes a mounting bracket provided on the main pump housing and used for mounting the rotational speed sensor; a probe simulator including a positioning head for positioning the probe and a measuring component. The positioning head rotates through the sensing groove, and the measuring component is used to obtain the distances from the positioning head to the axial inner side wall and the radial bottom wall of the sensing groove. The position of the rotational speed sensor on the mounting bracket is adjustable, and the relative positions of the rotational speed sensor with respect to the probe and the positioning member can be adjusted to ensure the accurate relative position between the rotational speed sensor and the probe, so as to meet the normal rotational speed detection of the rotational speed sensor for the probe.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power, and more particularly to a calibration device and a calibration method. Background Art

[0002] The reactor coolant pump of a nuclear power plant is abbreviated as the main pump, and its function is to make the coolant form a forced circulation, so as to transfer the heat energy generated in the reactor to the steam generator to generate steam to drive the steam turbine to do work. In order to ensure the normal operation of the main pump, it is necessary to monitor the operating state of the main pump. Among them, the main pump speed sensing device can effectively monitor the operating speed of the main pump.

[0003] The main pump speed sensing device generally adopts the magnetoresistive measurement principle and is designed as a U-shaped groove. It mainly includes two parts, a probe and a speed sensor. Among them, the probe is fixed on the main shaft of the main pump, so that it can rotate with the main shaft of the main pump. The speed sensor is fixed on an external bracket and is in a stationary state. When the main shaft of the main pump rotates to drive the probe to cut the main pump speed sensor, a pulse signal will be generated. By measuring this signal, the measurement of the main pump speed can be realized.

[0004] Since the main pump speed sensing device needs to be disassembled and assembled during each refueling period, the probe after installation has a certain inclination, which will affect the accuracy and stability of speed measurement to a certain extent.

[0005] After the probe is positioned, it is also necessary to calibrate and position the speed sensor, and adjust the relative position of the probe in the U-shaped groove of the speed sensor. The relative position between the probe and the speed sensor directly affects the accuracy of speed measurement. Therefore, a calibration method that can ensure calibration accuracy is required. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a calibration device and a calibration method for the positioning problem in the installation process of the existing speed sensor.

[0007] The present invention constructs a calibration device for calibrating the speed sensor of the main pump spindle. A probe is provided on the outer wall surface of the main pump spindle. A sensing groove penetrating in the circumferential direction is provided at one end of the speed sensor opposite to the main pump spindle. The sensing groove is used for the probe to rotate through. The calibration device is characterized in that it includes:

[0008] An installation bracket, which is arranged on the main pump housing and is used for installing the speed sensor;

[0009] The probe simulator includes a positioning head for positioning the probe and a measurement component. The positioning head rotates through the sensing groove, and the measurement component is used to obtain the distances from the positioning head to the axial inner side wall and the radial bottom wall of the sensing groove.

[0010] In some embodiments, the measurement component includes a first adjusting member for driving the axial movement of the positioning head and measuring the movement displacement, and a second adjusting member for driving the radial movement of the positioning head and measuring the movement displacement.

[0011] In some embodiments, the rotational speed sensor is provided with a first mounting hole. A first locking member passes through the first mounting hole and is locked to the mounting bracket. There is a clearance fit between the first locking member and the first mounting hole.

[0012] In some embodiments, the axial direction of the first mounting hole is the same as the penetrating direction of the sensing groove.

[0013] In some embodiments, the mounting bracket is provided with a second mounting hole. A second locking member passes through the second mounting hole and is locked to the pump body; there is a clearance fit between the second locking member and the second mounting hole.

[0014] In some embodiments, the axis of the first mounting hole forms an angle with the axis of the second mounting hole, and the axial direction of the second mounting hole is the same as the axial direction of the main pump spindle.

[0015] A calibration method using the main pump spindle rotational speed sensor calibration device described above includes the following steps:

[0016] Rotate the probe simulator in a circular motion around the axis of the main pump spindle until it is inside the sensing groove of the rotational speed sensor;

[0017] Adjust the position of the mounting bracket. When the positioning head of the probe simulator contacts the side surface of the sensing groove opposite to the main pump spindle, lock the mounting bracket to obtain the top clearance d of the sensing groove x ;

[0018] When the positioning head contacts the lower side surface of the sensing groove, obtain the lower clearance h of the sensing groove dy ;

[0019] When the positioning head contacts the upper side surface of the sensing groove, obtain the upper clearance h of the sensing groove uy ;

[0020] Confirm that the upper clearance h of the sensing groove uy , the lower clearance h of the sensing groove dy meet the requirements. Otherwise, adjust the vertical position of the rotational speed sensor until the upper clearance h of the sensing groove uy , the lower clearance h of the sensing groovedy After meeting the requirements, lock the mounting bracket.

[0021] In some embodiments,

[0022] The upper gap h of the sensing groove uy = Δh uy + h sy - h hy ;

[0023] The required range of the upper gap of the sensing groove: h ub ± h uj ;

[0024] If h ub - h uj ≤ h uy ≤ h ub + h uj , then the installation requirements are met;

[0025] h sy is the height of the vertical side of the positioning head, h hy is the height of the horizontal side of the positioning head, Δh uy is the upward displacement of the sensing groove, h ub is the standard value of the upper gap installation of the sensing groove, h uj is the installation accuracy of the upper gap of the sensing groove.

[0026] In some embodiments,

[0027] The lower gap h of the sensing groove dy = Δh dy + h hy ;

[0028] The required range of the lower gap of the sensing groove: h db ± h dj ;

[0029] If h db - h dj ≤ h dy ≤ h db + h dj , then the installation requirements are met;

[0030] h dy is the lower gap of the sensing groove, h hy is the height of the horizontal side of the positioning head, Δh dy is the downward displacement of the sensing groove, h db is the standard value of the lower gap installation of the sensing groove, h dj is the installation accuracy of the lower gap of the sensing groove.

[0031] In some embodiments,

[0032] The thickness h of the vertical side of the positioning member sx= d b ,

[0033] If the top clearance d of the sensing groove x = d b , the required range of the top clearance d of the sensing groove is achieved b ±d j , then the installation requirements are met;

[0034] If the horizontal side height h of the positioning part hy = h db -0.8*h dj , then the installation requirements are met

[0035] If the vertical side height h of the positioning part sy ≥h t , and the thickness of the probe is h t = 4 ± 0.1 mm, then the installation requirements are met;

[0036] h sx is the vertical side thickness of the positioning part, d b is the installation standard value of the top clearance of the sensing groove, d j is the installation accuracy of the top clearance of the sensing groove;

[0037] h hy is the horizontal side height of the positioning part, h sy is the vertical side height of the positioning part, h db is the installation standard value of the lower clearance of the sensing groove, h dj is the installation accuracy of the lower clearance of the sensing groove.

[0038] Implementing the calibration device and calibration method of the present invention has the following beneficial effects: The position of the rotational speed sensor on the mounting bracket is adjustable, and the relative position of the rotational speed sensor with respect to the probe and the positioning part can be adjusted to ensure the accurate relative position between the rotational speed sensor and the probe, meeting the normal rotational speed detection of the rotational speed sensor for the probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0040] Figure 1 is the assembled structural schematic diagram of the main pump spindle, probe, mounting assembly, probe simulator, and rotational speed sensor in the embodiment of the present invention;

[0041] Figure 2 is Figure 1 the three-dimensional structural schematic diagram during the assembly of the main pump spindle, probe, mounting assembly, probe simulator, and rotational speed sensor in

[0042] Figure 3 is Figure 1Exploded schematic diagram of the main pump main shaft, probe, mounting assembly, probe simulator, and rotational speed sensor;

[0043] Figure 4 Is Figure 4 Assembly schematic diagram of the base, adjusting member, and pan-tilt of the probe simulator in [device name];

[0044] Figure 5 Is Figure 1 Position schematic diagram of the probe and the rotational speed sensor in [device name];

[0045] Figure 6 Is Figure 1 Position schematic diagram of the probe and the positioning member in [device name];

[0046] Figure 7 Is Figure 1 Position schematic diagram of the probe, rotational speed sensor, and positioning member in [device name];

[0047] Figure 8 Is the installation schematic diagram of the rotational speed sensor. Detailed implementation manners

[0048] For a clearer understanding of the technical features, objectives, and effects of the present invention, the detailed implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0049] As follows Figures 1 to 3 As shown, the main pump rotational speed probe 1 is fixed on the main pump main shaft 2 and can rotate with the main pump main shaft 2. Preferably, the probe 1 is arranged on the outer wall surface of the main pump main shaft 2.

[0050] In an embodiment of the present application, a main pump rotational speed sensor probe positioning device is constructed. The positioning device includes a mounting assembly 31 and a probe simulator 32.

[0051] The probe simulator 32 includes a positioning member 321, a base 322, and an adjusting member 323. The positioning member 321 is provided with a positioning head B. The positioning member 321 is arranged on the base 322. The adjusting member 323 is used to drive the positioning member 321 to move along the axial and radial directions of the main pump main shaft 2 on the base 322 so that the positioning member 321 can abut against the end and side wall of the probe 1.

[0052] In this embodiment, in order to facilitate positioning of the end, bottom surface, and top surface of the probe 1, the positioning head B is L-shaped and includes a first section and a second section that are bent in sequence. The first section B1 can abut against the end of the probe 1, and the second section B2 can abut against the side wall of the probe 1. Generally, the two side surfaces inside the included angle of the positioning head 3211 can respectively position the end and bottom surface of the probe 1, or respectively position the end and top surface of the probe 1.

[0053] The L-shaped positioning head 3211 has a regular shape and its dimensions are easy to control, which can improve the positioning accuracy of the probe 1. In other embodiments, the shape of the positioning head 3211 of the positioning member 321 can also be other shapes. On the positioning head 3211, a first positioning area B1 and a second positioning area B2 can be formed. The first positioning area B1 positions the end of the probe 1, and the second positioning area B2 positions the bottom surface or the top surface of the probe 1. The first positioning area B1 and the second positioning area B2 can be planes, curved surfaces or pointed structures. Of course, the shape of the positioning head 3211 can also be U-shaped, and the three surfaces within the U-shaped opening can respectively position the end, the bottom surface and the top surface of the probe 1.

[0054] The positioning member 321 is made of 316 stainless steel material with a machining accuracy of 5um. The 316 stainless steel material has anti-rust, anti-corrosion properties and high strength to resist knocks; the design of minimizing parts eliminates the assembly error inside the component; and the designs of miniaturization, high precision and high reliability are achieved.

[0055] When the probe simulator 32 moves along the axial and radial directions of the main pump spindle 2, the positioning head B positions the end of the probe 1 and the bottom surface of the probe 1 respectively.

[0056] Of course, the positioning head B can also position the end of the probe 1 and the top surface of the probe 1 respectively, or position the end of the probe 1, the top surface and the bottom surface of the probe 1 respectively.

[0057] By using the positioning head B, it can be determined that under the cold stop condition, after the relative positions of the probe 1 and the positioning member 321 are positioned, the relative position between the probe 1 and the main pump spindle 2 is determined. The structure is simple, the positioning method is simple and fast, and the positioning efficiency is improved.

[0058] In some embodiments, the installation component 31 is disposed around the outer circumference of the main pump spindle 2 and is used for positioning with the end face and the outer ring of the main pump spindle 2 to form a positioning reference that is fixed in relative position with respect to the main pump spindle 2, and provides a positioning reference for the installation of the probe simulator 32.

[0059] The probe simulator 32 is slidably installed on the installation component 31. The probe simulator 32 can rotate circularly around the axis of the main pump spindle 2 along the installation component 31, so that it can rotate relative to the probe 1 on the main pump spindle 2. When rotating to the position of the probe 1, it can be used as a reference to position the probe 1.

[0060] In some embodiments, the mounting assembly 31 includes an annular collar 311 and mounting feet 312. Further, the inner diameter of the annular collar 311 is comparable to the outer diameter of the main pump spindle 2 for positioning with the outer wall surface of the main pump spindle 2. The annular collar 311 can serve as a reference for the outer wall surface. In addition, there are multiple mounting feet 312, which are circumferentially distributed along the annular collar 311 and connected to the annular collar 311 for positioning with the end face of the main pump spindle 2, using the mounting feet 312 as the positioning for the end face of the main pump spindle 2.

[0061] The mounting assembly 31 is simultaneously positioned with the outer wall surface and the end face at the lower end of the main pump spindle 2, which can provide multi-directional references for the positioning of the probe simulator 32 and result in more accurate positioning. In other embodiments, the mounting assembly 31 can also be simultaneously positioned with the outer wall surface and the end face at the upper end of the main pump spindle 2.

[0062] In this embodiment, both the annular collar 311 and the mounting feet 312 are positioned on the main pump spindle 2 by magnetic adsorption. Of course, in other embodiments, only the annular collar 311 can be positioned by magnetic adsorption, or only the mounting feet 312 can be positioned by magnetic adsorption, as long as the positioning of the mounting assembly 31 is stable and reliable.

[0063] In this embodiment, mounting grooves A for installing magnets are provided on both the annular collar 311 and the mounting feet 312. A number of mounting grooves A are circumferentially spaced along the outer wall surface of the annular collar 311 for laterally clamping the magnets.

[0064] Preferably, the mounting feet 312 extend radially along the annular collar 311, making the distribution of the mounting feet 312 more uniform and the force more stable.

[0065] Further, in this embodiment, the annular collar 311 includes four arc-shaped platforms 3111 circumferentially distributed. Each platform 3111 is spliced into a circular ring circumferentially, and two mounting feet 312 are provided on each platform 3111.

[0066] It can be understood that in other embodiments, the annular collar 311 can also include two or more other numbers of arc-shaped platforms 3111 circumferentially distributed. Each arc-shaped platform 3111 is spliced into a ring circumferentially, and the number of mounting feet 312 on each platform 3111 can also be one or more other numbers.

[0067] Further, the mounting feet 312 can be an integral structure with the annular collar 311. When the annular collar 311 is segmented, the mounting feet 312 can also be an integral structure with the arc-shaped platforms 3111.

[0068] Preferably, each arc-shaped surrounding platform 3111 is a single part. The arc-shaped surrounding platform 3111 is magnetically attracted to the side of the main pump spindle 2, and the mounting feet 312 integrally designed with the arc-shaped surrounding platform 3111 are magnetically attracted to the bottom surface of the main pump spindle 2. The arc-shaped surrounding platform 3111 is made of 316 stainless steel with a machining accuracy of 5 μm, which can prevent rust and corrosion and has high strength against bumps. The design with extremely few parts eliminates the assembly errors inside the components, achieving miniaturization, high precision, and high reliability designs.

[0069] Preferably, in order to ensure the installation accuracy of the installation component 31, the installation component 31 is integrally machined and made of the same material of 316 stainless steel to avoid large deformations during placement or movement.

[0070] Preferably, in order to ensure the accurate movement trajectory of the probe simulator 32, a guiding structure for the sliding installation of the probe simulator 32 is provided on the installation component 31, allowing the probe simulator 32 to rotate circularly around the axis of the main pump spindle 2 along the installation component 31. Usually, the probe simulator 32 is slidably engaged with the guiding structure to make the rotation of the probe simulator 32 smoother, so that during the movement of the probe simulator 32, the axial height and radial displacement changes of the probe simulator 32 are within a controllable range and do not change significantly.

[0071] Furthermore, the guiding structure is detachably installed on the installation component 31 for easy assembly. In this embodiment, the guiding structure is magnetically adsorbed to the installation component 31 to improve the adsorption stability. Preferably, the guiding structure is an annular guide rail provided along the circumference of the main pump spindle 2 on the annular surrounding ring 311. In some embodiments, the guiding structure is detachably installed on the annular surrounding ring 311. Of course, the guiding structure can also be directly formed on the annular surrounding ring 311, such as a guiding groove.

[0072] Combined with Figures 1 to 4 as shown, the present application also constructs a main pump speed sensor probe simulation rotation device for simulating the rotation of the probe on the main pump spindle 2.

[0073] Furthermore, the simulation rotation device includes a positioning component 31 and a probe simulator 32, and the installation component 31 is arranged around the outer circumference of the main pump spindle 2.

[0074] The probe simulator 32 includes a positioning member 321, a base 322, and an adjusting member 323. The positioning member 321 is installed on the adjusting member 323, and the adjusting member 323 is movably installed on the base 322 for driving the positioning member 321 to move radially and axially along the main pump spindle 2 to position the probe.

[0075] The base 322 is slidably mounted on the mounting assembly 31 to drive the positioning member to slide along the mounting assembly. Since the probe simulator 32 can rotate circularly around the main pump shaft 2 along the mounting assembly 31, relative rotation occurs between the probe 1 and the simulated rotation device, simulating the rotation of the probe 1.

[0076] The probe simulator 32 of the simulated rotation device rotates relative to the probe 1 on the main pump shaft 2, generating relative rotation relative to the probe 1, which can simulate the rotation of the probe 1 and use the relative position between the two during rotation to determine whether the positioning of the probe 1 is accurate. This process can be carried out when the main pump shaft 2 is stopped, thereby improving efficiency.

[0077] Preferably, the adjusting member 323 is magnetically attracted to and positioned on the base 322. Furthermore, the adjusting member 323 can be embedded in the base 322, combining embedding and adsorption to achieve accurate positioning and good stability. It is understood that either magnetic attraction or embedding can also be used for positioning.

[0078] When using magnetic adsorption for positioning, the magnets can be distributed to make the magnetic attraction more uniform and balanced. Furthermore, magnetic adsorption has the following effects:

[0079] 1. The contact surface of the two parts that are magnetically attracted to each other is complete and smooth, which can eliminate interference with the magnetic attraction and movement effects;

[0080] 2. The magnetic attraction force is evenly distributed, the magnetic attraction force can be adjusted, the adsorption is reliable, and it is easy to install, disassemble, and move the probe simulator 32;

[0081] 3. Under the premise of miniaturization and ensuring strength, the weight of parts can be reduced, which is beneficial to lightweight design.

[0082] The base 322 of the probe simulator 32 is also made of 316 stainless steel with a processing accuracy of 5 μm; the lower end surface of the base 322 and the annular ring 311 are also mounted by magnetic attraction.

[0083] The surface of the base 322 that cooperates with the main pump shaft 2 adopts a fitting design with the circumferential surface of the main pump shaft 2. The bottom of the base 322 is designed with an embedded, distributed, programmable sheet magnet warehouse C corresponding to the circumferential surface of the main pump shaft 2, and a soft iron belt warehouse that is magnetically attracted to the annular ring 311. Considering that the installed probe simulator 32 should be easy to move smoothly along the circumference of the main pump shaft 2, in addition, the annular ring 311 is designed with an embedded sheet magnet, so the corresponding part of the base 322 that has magnetic attraction requirements with the annular ring 311 can no longer use magnets, but use soft iron belts.

[0084] In some embodiments, see Figure 3 and Figure 4, the adjusting member 323 includes a first movable seat 3231 and a second movable seat 3232. The first movable seat 3231 can move axially along the main pump spindle 2 between the first movable seat 3231 and the base 322. The second movable seat 3232 can move radially along the main pump spindle 2 between the second movable seat 3232 and the first movable seat 3231. A positioning member 321 is installed on the second movable seat 3232.

[0085] Furthermore, a first guiding structure for guiding the first movable seat 3231 is provided on the base 322, so that the first movable seat and the base can move relative to each other. A second guiding structure for guiding the second movable seat 3232 is provided on the first movable seat 3231, so that the second movable seat and the first movable seat can move relative to each other. When adjusting the first movable seat and the second movable seat, the position adjustment of the positioning member 321 can be realized, which is convenient for adjusting the position of the positioning member 321 to position the probe 1.

[0086] Preferably, the first guiding structure guides axially along the main pump spindle 2, and the second guiding structure guides radially along the main pump spindle 2. One is for guiding axially along the main pump spindle 2, and the other is for guiding radially along the main pump spindle 2. The position adjustment of the positioning member 321 in different directions can be realized, making the adjustment more accurate and flexible. For example, the first guiding structure includes a guide rail provided between the base and the first movable seat, and the guide rail extends axially along the main pump spindle 2, so that the first movable seat can reciprocate axially relative to the base along the main pump spindle 2, thereby driving the positioning member to reciprocate axially along the main pump spindle 2; the second guiding structure includes a guide rail provided between the second movable seat and the second movable seat, and the guide rail extends radially along the main pump spindle 2, so that the second movable seat can reciprocate radially relative to the first movable seat along the main pump spindle 2, thereby driving the positioning member to reciprocate radially along the main pump spindle 2. In other embodiments, the guiding directions of the first guiding structure and the second guiding structure may also form an angle, which is convenient for adjusting the position of the positioning member 321 in different directions.

[0087] Of course, in other embodiments, the first guiding structure is a guide groove, or a combination of a guide groove and a guide rail, as long as it can provide stable guiding. Further, the second guiding structure is a guide groove, or a combination of a guide groove and a guide rail, so as to provide stable guiding.

[0088] The probe simulator 32 further includes a measuring component 324. The measuring component 324 further includes a first adjusting member 3241 for driving the first movable seat 3231 to move, and a second adjusting member 3242 for driving the second movable seat 3232 to move. When driving the first movable seat 3231 and the second movable seat 3232 to move, the driving of the positioning head 3211 to move is realized.

[0089] The first adjusting member 3241 is rotatably arranged on the base and is in rotational cooperation with the first movable seat. The second adjusting member 3242 is rotatably arranged on the first movable seat and is in rotational cooperation with the second movable seat.

[0090] The measuring component 324 of the probe simulator 32 can be a miniaturized precision pan-tilt, usually model LE40-L, which can be used to detect the moving displacement of the base 322 and the adjusting member 323. The movement range of this pan-tilt is 10 mm.

[0091] In this embodiment, the first adjusting member 3241 and the second adjusting member 3242 can be the knobs on two pan-tilts respectively. By rotating the knobs, the position adjustment and movement of the positioning member 321 on the adjusting member 323 can be realized.

[0092] Replace the original micrometer screw of the pan-tilt of the measuring component 324 with a digital micrometer DMH-1, communicate with the display through a converter DMH-DL-U, and use a digital micrometer with a digital interface to realize the centralized digital display of the measurement values of multi-dimensional gaps, so that during the adjustment process of the first adjusting member 3241 and the second adjusting member 3242, the moving displacement of the positioning member 321 can also be measured.

[0093] As Figure 4 shown, further, in order to facilitate the positioning of the simulation rotating device and improve the positioning accuracy, a positioning surface D that cooperates with the outer wall surface of the main pump spindle 2 is provided on the base 322. Using the surface of the main pump spindle 2 for positioning, the reference is stable and deviation is not likely to occur.

[0094] Preferably, the positioning surface D on the base 322 is an arc surface and matches the outer wall surface shape of the main pump spindle 2. By relying on the positioning surface D to fit onto the outer wall surface of the main pump spindle 2, positioning is achieved. In other embodiments, several positioning protrusions can also be provided on the positioning surface D of the base 322, and each protrusion can respectively fit onto the surface of the main pump spindle 2 to achieve the positioning of the base 322.

[0095] Further, the mounting component 31 positions with the end face and the outer ring of the main pump spindle 2, and the base 322 is magnetically adsorbed onto the mounting component 31. The base 322 also relies on the mounting component 31 to achieve positioning, making the positioning more stable and reliable.

[0096] When the probe simulator 32 completes the positioning of the probe 1, the rotational speed of the probe 1 can be detected through the rotational speed sensor 4.

[0097] Generally, the rotational speed sensor 4 adopts the magnetoresistive measurement principle. The rotational speed sensor 4 is provided with a sensing groove 41. In this embodiment, the sensing groove 41 is U-shaped. When measuring the rotational speed of the probe 1, the sensing groove 41 of the rotational speed sensor 4 is located at one end opposite to the main pump spindle 2. The sensing groove 41 runs through circumferentially along the main pump spindle 2. Preferably, the width of the sensing groove 41 is greater than the thickness of the probe 1, allowing the probe 1 and the positioning head 3211 for positioning the probe 1 to be caught and pass through simultaneously during rotation.

[0098] Combined Figures 5 to 8 As shown, the present application also discloses a calibration device for the main pump rotational speed sensor, which is used to calibrate the rotational speed sensor of the main pump spindle. A probe 1 is provided on the outer wall surface of the main pump spindle 2. The sensing groove 41 that runs through circumferentially is provided at one end of the rotational speed sensor 4 opposite to the main pump spindle 2. The sensing groove is used for the probe to rotate through.

[0099] The calibration device includes a mounting bracket 5 and a probe simulator 32. The mounting bracket 5 is arranged on the main pump housing and is used to mount the rotational speed sensor 4, enabling the rotational speed sensor 4 to detect the rotational speed of the probe 1 as it rotates with the main pump spindle 2.

[0100] The probe simulator 32 includes a positioning head 3211 for positioning the probe 1 and a measuring component 324. The positioning head rotates through the sensing groove, and the measuring component 324 is used to obtain the distances from the positioning head 3211 to the axial inner side wall and the radial bottom wall of the sensing groove 41.

[0101] The main pump rotational speed sensor 4 is fixed on the mounting bracket 5 and is in a stationary state. When the main pump spindle 2 rotates to drive the probe 1 to cut the rotational speed sensor 4, a pulse signal will be generated. Therefore, when the main pump is running normally, the rotational speed sensor 4 will generate a specific frequency signal, and the rotational speed of the main pump is measured through this signal.

[0102] Preferably, the mounting bracket 5 is installed on the pump body and is supported by the pump body, which can make the installation of the mounting bracket 5 more stable. Further, the position of the mounting bracket 5 on the pump body is adjustable. Thus, when adjusting the position of the mounting bracket 5, the relative position of the rotational speed sensor 4 with respect to the probe 1 can be adjusted.

[0103] The probe 1 and the positioning head 3211 rotate through the sensing groove. By adjusting the first adjusting member 3241 and the second adjusting member 3242 of the measuring component 324, the positioning head 3211 is moved. While moving, the measuring component 324 can measure the moving displacement of the positioning head 3211, obtain the relative positions before and after the movement, and the measuring component 324 obtains the distances from the positioning head 3211 to the axial inner side wall and the radial bottom wall of the sensing groove 41.

[0104] Preferably, the position of the rotational speed sensor 4 on the mounting bracket 5 is adjustable, and the relative position of the rotational speed sensor 4 with respect to the probe 1 and the positioning member 321 can be adjusted to ensure the accurate relative position between the rotational speed sensor 4 and the probe 1, meeting the normal rotational speed detection requirements of the rotational speed sensor 4 for the probe 1.

[0105] In some embodiments, a first mounting hole 42 is provided on the rotational speed sensor 4. After the first locking member passes through the first mounting hole 42, it is locked to the mounting bracket 5. There is a clearance fit between the first locking member and the first mounting hole 42, allowing the rotational speed sensor 4 to laterally adjust its position relative to the first locking member to meet the relative position requirements between the rotational speed sensor 4 and the probe 1.

[0106] Furthermore, in this embodiment, the axial direction of the first mounting hole 42 is the same as the penetration direction of the sensing groove 41. Due to the clearance fit between the first mounting hole 42 and the first locking member, the rotational speed sensor can be offset to different sides of the first locking member, thereby adjusting the position of the rotational speed sensor 4 relative to the probe 1 in the horizontal and vertical directions. At the same time, the swinging direction of the rotational speed sensor 4 can also be adjusted.

[0107] Preferably, a second mounting hole 51 is provided on the mounting bracket 5. After the second locking member passes through the second mounting hole 51, it is locked to the pump body; there is a clearance fit between the second locking member and the second mounting hole 51, allowing the rotational speed sensor 4 to laterally adjust its position relative to the second locking member to meet the relative position requirements between the rotational speed sensor 4 and the probe 1.

[0108] Furthermore, to achieve multi-directional adjustment, the axial direction of the first mounting hole 42 forms an angle with the axial direction of the second mounting hole 51, and the axial direction of the second mounting hole 51 is the same as the axial direction of the main pump spindle 2, allowing the rotational speed sensor 4 to adjust its position relative to the probe 1 in the horizontal direction. At the same time, the swinging direction of the rotational speed sensor 4 can also be adjusted.

[0109] Generally, since the relative position between the main pump speed probe 1 and the main pump speed sensor 4 directly affects the measurement accuracy and stability, there are strict requirements for the installation of the main pump speed probe 1 and the main pump speed sensor 4.

[0110] Rotate the main pump spindle 2 to place the main pump speed probe 1 at the middle position of the sensing groove 41 of the main pump speed sensor 4, and the clearance needs to be measured. The measured clearances include the upper clearance of the sensing groove 41, the lower clearance of the sensing groove 41, and the clearance between the probe 1 and the bottom of the sensing groove 41 to determine whether the installation standard requirements are met.

[0111] Furthermore, another embodiment of the present application also discloses a method for installing the spindle speed sensor 4, including the following steps:

[0112] Rotate the probe simulator 32 in a circular motion around the axis of the main pump spindle 2 until it is inside the sensing groove 41 of the rotational speed sensor 4;

[0113] Adjust the position of the mounting bracket 5. When the positioning head 3211 of the probe simulator 32 contacts the side surface of the sensing groove 41 opposite to the main pump spindle 2, lock the mounting bracket 5 to obtain the top clearance d of the sensing groove; x ;

[0114] When the positioning head 3211 contacts the lower side surface of the sensing groove 41, obtain the lower clearance h of the sensing groove; dy ;

[0115] When the positioning head 3211 contacts the upper side surface of the sensing groove 41, obtain the upper clearance h of the sensing groove; uy ;

[0116] Confirm that the upper clearance h of the sensing groove; uy , the lower clearance h of the sensing groove; dy Meet the requirements. Otherwise, adjust the vertical position of the rotational speed sensor 4 until the upper clearance h of the sensing groove; uy , the lower clearance h of the sensing groove; dy Meet the requirements, and then lock the mounting bracket 5.

[0117] Furthermore, the upper clearance of the sensing groove satisfies the formula: h; uy =Δh; uy +h; sy -h; hy , where Δh; uy Is the upward displacement of the sensing groove, h; sy Is the height of the vertical side of the positioning head 3211, h; hy Is the height of the horizontal side of the positioning head 3211;

[0118] The requirement for the upper clearance of the sensing groove satisfies the range: h; ub ±h; uj , where h; ub Is the installation standard value of the upper clearance of the sensing groove, h; uj Is the installation accuracy of the upper clearance of the sensing groove;

[0119] During the adjustment process, if the upper clearance of the sensing groove satisfies: h; ub -h; uj ≤h; uy ≤h; ub +h; uj , then the installation of the rotational speed sensor meets the installation requirements.

[0120] Furthermore, the lower clearance of the sensing groove satisfies the formula: h; dy =Δh; dy +h; hy , where h; dy Is the lower clearance of the sensing groove, h;hy For the height of the horizontal side of the positioning head 3211, Δh dy For the downward displacement of the sensing groove, ;

[0121] Range of requirements for the lower clearance of the sensing groove: h db ±h dj , where h db is the installation standard value of the lower clearance of the sensing groove, h dj is the installation accuracy of the lower clearance of the sensing groove;

[0122] During the adjustment process, if h db -h dj ≤h dy ≤h db +h dj , the installation requirements are met.

[0123] Furthermore, the thickness h of the vertical side of the positioning head 3211 sx =d b , where h sx is the thickness of the vertical side of the positioning head 3211, d b is the installation standard value of the top clearance of the sensing groove;

[0124] Adjust the second locking part. When the top plane of the U-shaped sensing groove contacts the vertical side plane of the positioning head 3211, lock the second locking part. This method ensures that the top clearance d of the sensing groove x =d b , and the required range of the top clearance of the sensing groove d b ±d j , where d j is the installation accuracy of the top clearance of the sensing groove, then the installation requirements are met;

[0125] During the adjustment process, if the height h of the horizontal side of the positioning head 3211 hy =h db -0.8*h dj , where h db is the installation standard value of the lower clearance of the sensing groove, h dj is the installation accuracy of the lower clearance of the sensing groove,

[0126] This height design ensures that the positioning part 321 can enter the sensor sensing groove 41 normally, and at the same time ensures a qualified margin of 0.2*h dj , then the installation requirements are met;

[0127] If the height h of the vertical side of the positioning head 3211 sy ≥h t , and the thickness of the probe 1 is h t =4±0.1mm, then the installation requirements are met;

[0128] h hyFor the horizontal side height of the positioning head 3211, h sy For the vertical side height of the positioning head 3211, h db For the installation standard value of the lower clearance of the sensing groove, h dj For the installation accuracy of the lower clearance of the sensing groove.

[0129] The rotational speed sensor 4 is installed on the mounting bracket 5 through the first locking member, and the mounting bracket 5 is installed on the main pump body through the second locking member. The second locking member can adjust the forward and backward movement of the rotational speed sensor 4; the first locking member can adjust the forward and backward movement, upward and downward movement, and rotation at a certain angle of the sensor.

[0130] During installation, first position the second locking member. The second locking member adjusts the top clearance d of the type groove x . If the upper clearance h of the sensing groove uy , the lower clearance h of the sensing groove dy , and the top clearance d of the sensing groove x all meet the installation standard requirements, there is no need to adjust the first locking member anymore. If they do not meet the installation standard requirements, the first locking member needs to be adjusted.

[0131] The measurement of the clearance between the rotational speed sensor 4 and the probe 1 is carried out and confirmed in the starting state of the jacking oil pump at the 2.5 Mpa platform.

[0132] The outer shape of the measuring piece used for measurement is the same as the outer dimension of the positioning head 3211 of the positioning member 321. The measuring piece is a high-precision machined part. The specific dimensions of the measuring piece are:

[0133] The horizontal side height h of the measuring piece hy = h db - h dj , where h db is the installation standard value of the lower clearance of the sensing groove, and h dj is the installation accuracy of the lower clearance of the sensing groove;

[0134] The vertical side height h of the measuring piece sy ≥ h t , and the thickness of the probe 1 is h t = 4 + 0.1 mm,;

[0135] The vertical side thickness h of the measuring piece sx = d b - d j , where d b is the installation standard value of the top clearance of the sensing groove, and d j is the installation accuracy of the top clearance of the sensing groove.

[0136] Specifically, it includes the following measurement steps:

[0137] Rotate the main pump spindle 2 to rotate the probe 1 to the sensing groove 41 of the rotational speed sensor 4;

[0138] Move the measuring piece along the guiding mechanism of the annular ring 311 around the main pump spindle 2 and move the measuring piece to the rotational speed sensor 4;

[0139] Use a high-precision two-dimensional moving device to make the top of the probe 1 contact the inner plane of the vertical side of the measuring piece, and the lower plane of the probe 1 contact the upper plane of the horizontal side of the measuring piece to obtain the reference positioning of the measuring piece;

[0140] When the U-shaped top plane contacts the outer plane of the vertical side of the measuring piece, the top clearance of the sensing groove is obtained;

[0141] Use a high-precision two-dimensional moving device to make the lower plane of the horizontal side of the measuring piece contact the lower plane of the sensing groove 41 to obtain the lower clearance of the sensing groove;

[0142] Use a high-precision two-dimensional moving device to make the upper plane of the speed side of the measuring piece contact the upper plane of the sensing groove 41 to obtain the upper clearance of the sensing groove.

[0143] The measuring piece is installed on a high-precision two-dimensional moving device to achieve two-dimensional movement in the x-axis and y-axis directions, and at the same time, the movement amount is measured with high precision.

[0144] Referring to the calibration of the rotational speed sensor 4, similarly, the upper clearance h of the sensing groove uy = Δh uy + h sy - h hy , where Δh uy is the upward displacement of the sensing groove, h sy is the height of the vertical side of the positioning head 3211, h hy is the height of the horizontal side of the positioning head 3211;

[0145] The required range of the upper clearance of the sensing groove: h ub ± h uj , where h ub is the installation standard value of the upper clearance of the sensing groove, h uj is the installation accuracy of the upper clearance of the sensing groove;

[0146] If h ub - h uj ≤ h uy ≤ h ub + h uj , then the installation requirements are met, and green is displayed on the display screen, otherwise red is displayed.

[0147] The lower clearance h of the sensing groove dy = Δh dy + h hy , where h dy is the lower clearance of the sensing groove, hhy For the height of the horizontal side of the positioning head 3211, Δh dy is the downward displacement of the sensing groove;

[0148] The required range of the upper gap of the sensing groove: h db ±h dj , where h db is the installation standard value of the lower gap of the sensing groove, and h dj is the installation accuracy of the lower gap of the sensing groove;

[0149] If h db -h dj ≤h dy ≤h db +h dj , the installation requirements are met, and green is displayed on the display screen; otherwise, red is displayed.

[0150] The top gap d of the sensing groove x =h sx +Δd x ;

[0151] The required range of the top gap of the sensing groove: d b ±d j , where h sx is the thickness of the vertical side of the positioning head 3211, d b is the installation standard value of the top gap of the sensing groove, and dj is the installation accuracy of the top gap of the sensing groove;

[0152] If d b -d j ≤d x ≤d b +d j , the installation requirements are met, and green is displayed on the display screen; otherwise, red is displayed.

[0153] Among them, the upward displacement Δh of the sensing groove uy , the downward displacement Δh of the sensing groove dy , and the forward displacement Δd of the top gap of the sensing groove x .

[0154] It has the following innovation points:

[0155] ① The calibration device is characterized by miniaturization, light weight, anti-collision, anti-rust and anti-corrosion, simple on-site operation, extremely few parts, high precision, and high reliability.

[0156] ② There is no mechanical interference between the calibration device and the displacement sensor, and there is no mechanical interference between the calibration device and the probe 1 and the rotational speed sensor 4.

[0157] ③ Under cold shutdown conditions, no matter where the probe 1 is located on the main shaft, the calibration device only needs to be simply installed once to quickly simulate the rotation of the main pump main shaft 2, and can perform real-time high-precision synchronous measurement on the top clearance, upper clearance, and lower clearance between the probe 1 and the sensing groove, and can be presented in a digital display form. If the data is qualified, it is marked in green; if the data is unqualified, it is marked in red, thus realizing the calibration and installation of the speed sensor 4.

[0158] ④ The turntable 3111 adopts a 4-piece integrated design, and each piece is a single part; the probe simulator 32 adopts a single-part design scheme; the design with extremely few parts eliminates the internal assembly error of the components, realizes miniaturization, high precision, and high reliability design; it is made of 316 material, resistant to bumps, rust, and corrosion.

[0159] ⑤ When the calibration device is installed and disassembled on-site, no tools are required; the 4-piece integrated turntable 3111 and the side of the main shaft, as well as the bottom feet of the integrated turntable 3111 and the bottom surface of the main shaft, adopt a magnetic adsorption method; the cloud platform base of the measurement component 324 with two degrees of freedom in the axial and radial directions and the main shaft, as well as the turntable 3111, all adopt a magnetic adsorption method; the magnetic adsorption adopts a magnet-embedded, distributed, programmable design scheme.

[0160] ⑥ During the R & D process of the calibration device, a main shaft simulation debugging bench is made of the same material as the main shaft. By adjusting the magnetic force design, the number and distribution of the sheet magnets, the magnetic adsorption force between the turntable 3111 and the side of the main shaft, as well as the bottom feet of the integrated turntable 3111 and the bottom surface of the main shaft, is appropriate, the magnetic adsorption distribution is uniform, the installation and disassembly are convenient, and the adsorption is reliable; the magnetic adsorption force between the cloud platform base of the measurement component 324 and the side of the main shaft, as well as the turntable 3111, is appropriate, the magnetic adsorption distribution is uniform, the installation, disassembly, and movement are convenient, and the adsorption is reliable. The contact surfaces of the mutual magnetic adsorption have no openings or grooves, and are complete and smooth.

[0161] The installation and adjustment window of the main pump speed sensor 4 of the multi-site nuclear power unit is the 2.5 Mpa platform of the primary loop pressure. This work is on the main path of the refueling outage, directly affecting the refueling outage duration and the power generation of the unit; if it is optimized and adjusted to the cold state window, that is, the 0 Mpa platform of the primary loop pressure is executed, about 3 hours of the main refueling outage time can be saved, effectively improving the power generation of the nuclear power unit, and having significant economic and social benefits.

[0162] By studying the calibration device and method of the main pump speed sensor under cold shutdown conditions, the calibration of the main pump speed sensor 4 under cold shutdown conditions is realized, and the production process is optimized and improved, which can create huge production value. At the same time, the existing calibration methods of the main pump speed sensor are applicable to domestic multi-site nuclear power units and foreign French EDF nuclear power units. The research results have significant reference and borrowing significance and have wide promotion and application value. It can be understood that the above technical features can be combined and used arbitrarily without limitation.

[0163] The above are only embodiments of the present invention, and do not thereby limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall equally be included within the patent protection scope of the present invention.

Claims

1. A calibration device for calibrating a rotational speed sensor of a main pump spindle (2). A probe (1) is provided on the outer wall surface of the main pump spindle (2). One end of the rotational speed sensor (4) opposite to the main pump spindle (2) is provided with a circumferentially penetrating sensing groove (41), and the sensing groove (41) is used for allowing the probe (1) to rotate through. It is characterized in that, The calibration device includes: a mounting bracket (5) which is arranged on the main pump housing and is used for mounting a rotational speed sensor (4); a probe simulator (32) including a positioning head (3211) for positioning the probe (1) and a measuring assembly (324), the positioning head (3211) rotates through the sensing groove (41), and the measuring assembly (324) is used to obtain the distances from the positioning head (3211) to the axial inner side wall and the radial bottom wall of the sensing groove (41); the measuring assembly (324) includes a first adjusting member for driving the axial movement of the positioning head (3211) and measuring the moving displacement, and a second adjusting member for driving the radial movement of the positioning head (3211) and measuring the moving displacement.

2. The calibration device according to claim 1, characterized in that, A first mounting hole (42) is provided on the rotational speed sensor (4), and a first locking member passes through the first mounting hole (42) and then locks to the mounting bracket (5), and there is a clearance fit between the first locking member and the first mounting hole (42).

3. The calibration device according to claim 2, characterized in that, The axial direction of the first mounting hole (42) is the same as the penetrating direction of the sensing groove (41).

4. The calibration device according to claim 2 or 3, characterized in that, A second mounting hole (51) is provided on the mounting bracket (5), and a second locking member passes through the second mounting hole (51) and then locks to the pump body; there is a clearance fit between the second locking member and the second mounting hole (51).

5. The calibration device according to claim 4, wherein The axis of the first mounting hole (42) forms an angle with the axis of the second mounting hole (51), and the axis of the second mounting hole (51) is the same as the axial direction of the main pump spindle (2).

6. A calibration method using the calibration device according to any one of claims 1 to 5, characterized in that, including the following steps: rotating the probe simulator (32) circularly around the axis of the main pump spindle (2) until it is inside the sensing groove (41) of the rotational speed sensor (4); Adjust the position of the mounting bracket (5), and lock the mounting bracket (5) when the positioning head (3211) of the probe simulator (32) contacts the side of the sensing groove (41) opposite to the main pump spindle (2), so as to obtain the top clearance of the sensing groove ; When the lower side of the positioning head (3211) contacts the lower side of the sensing groove (41), the lower clearance of the sensing groove is obtained ; When the positioning head (3211) contacts the upper side of the sensing groove (41), the upper clearance of the sensing groove is obtained ; Confirm the upper gap and lower gap of the sensing groove and the lower gap of the sensing groove meet the requirements. Otherwise, adjust the vertical position of the rotational speed sensor (4) until the upper gap of the sensing groove and the lower gap of the sensing groove meet the requirements, and then lock the mounting bracket (5).

7. The calibration method of the calibration device according to claim 6, characterized in that Gap above the sensing groove ; Sensing slot upper clearance requirement range: ; If , the installation requirements are met; is the height of the vertical side of the positioning head (3211), is the height of the horizontal side of the positioning head (3211), is the upward displacement of the sensing groove, is the standard value for the installation of the upper gap of the sensing groove, is the installation accuracy of the upper gap of the sensing groove.

8. The calibration method of the calibration device according to claim 7, characterized in that Lower gap of the sensing groove ; Sensing slot lower clearance requirement range: ; If , the installation requirements are met; For sensing the lower clearance of the groove, is the height of the horizontal side of the positioning head (3211), is the downward displacement of the sensing groove, is the installation standard value of the lower clearance of the sensing groove, is the installation accuracy of the lower clearance of the sensing groove.

9. The calibration method of the calibration device according to claim 7, characterized in that The thickness of the vertical side of the positioning member (321) , If the top clearance of the sensing groove achieves the required range of the top clearance of the sensing groove , the installation requirements are met; If the height of the horizontal side of the positioning member (321) , the installation requirements are met If the vertical side height of the positioning member (321) , and the thickness of the probe (1) is , then the installation requirements are met; For the vertical side thickness of the positioning member (321), For the installation standard value of the top clearance of the sensing groove, For the installation accuracy of the top clearance of the sensing groove; is the horizontal side height of the positioning part (321), is the vertical side height of the positioning part (321), is the installation standard value of the lower gap of the sensing groove, is the installation accuracy of the lower gap of the sensing groove.

Images