Main pump speed sensor probe positioning device

Abstract

The present invention relates to a probe positioning device for the main pump speed sensor, which is used to position the probe installed on the main shaft of the main pump. The positioning device includes a probe simulator, and the probe simulator includes a positioning member, a base, and an adjusting member. The positioning member is arranged on the base, and the adjusting member is used to adjust the axial and radial movement of the positioning member on the base along the main shaft of the main pump, so that the positioning member can abut against the head and side wall of the probe. The positioning member of the probe simulator can move axially and radially relative to the main shaft of the main pump. When rotated to the probe position, it can be used as a reference to position the probe, determining the relative position between the probe and the main shaft of the main pump. The structure is simple, the positioning method is simple and fast, and the positioning efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power, and more particularly, to a positioning device for a probe of a main pump speed sensor. 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 use of a 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 the speed sensor is in a static 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, and the measurement of the main pump speed can be realized by measuring this signal.

[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] Therefore, it is necessary to position the probe. However, during the positioning process of the probe, the normal operation of the main pump main shaft cannot be affected. Otherwise, its positioning result will deviate from the actual one, and at the same time, it will also affect the normal power generation of the main pump. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a positioning device for a probe of a main pump speed sensor in view of the problem that the probe is inclined after installation due to multiple disassembly and assembly of the main pump speed sensing device in the prior art.

[0007] The technical solution adopted by the present invention to solve its technical problem is to construct a positioning device for a probe of a main pump speed sensor for positioning a probe installed on the main shaft of a main pump. The positioning device includes a probe simulator;

[0008] The probe simulator includes a base, a positioning member and an adjusting member. The positioning member is arranged on the base, and the adjusting member is used to adjust the positioning member to move axially and radially along the main shaft of the main pump on the base so that the positioning member can abut against the end and side wall of the probe.

[0009] In some embodiments, the positioning member includes a positioning head, and the positioning head includes a first section and a second section that are bent in sequence. The first section can abut against the end of the probe, and the second section can abut against the side wall of the probe.

[0010] In some embodiments, the adjusting member includes a first movable seat and a second movable seat. The first movable seat and the base can move axially along the main pump spindle, and the second movable seat and the first movable seat can move radially along the main pump spindle. The positioning member is mounted on the second movable seat.

[0011] The base is provided with a first guiding structure for guiding the first movable seat, and the first movable seat is provided with a second guiding structure for guiding the second movable seat;

[0012] The first guiding structure guides axially along the main pump spindle, and the second guiding structure guides radially along the main pump spindle.

[0013] In some embodiments, the first guiding structure is a guiding groove and / or a guiding rail, and the second guiding structure is a guiding groove and / or a guiding rail.

[0014] In some embodiments, the probe simulator further includes a first adjusting member for driving the first movable seat to move, and a second adjusting member for driving the second movable seat to move.

[0015] In some embodiments, the base is provided with a positioning surface that cooperates with the outer wall surface of the main pump spindle.

[0016] In some embodiments, the positioning surface is an arc surface and matches the outer contour of the main pump spindle.

[0017] In some embodiments, the positioning device further includes a mounting assembly disposed around the outer periphery of the main pump spindle, and the base is slidably mounted on the mounting assembly to be rotatable along the mounting assembly.

[0018] In some embodiments, the mounting assembly includes an annular ring and mounting feet. The annular ring is used for detachably connecting to the outer ring of the main pump spindle. The mounting feet are connected to the annular ring and extend towards the inner ring of the annular ring. The mounting feet are used for detachably connecting to the end face of the main pump spindle;

[0019] The annular ring and / or the mounting feet are used for magnetically connecting to the main pump spindle.

[0020] Implementing the probe positioning device for the main pump speed sensor of the present invention has the following beneficial effects: The probe simulator is slidably mounted on the mounting component so as to be able to rotate circularly around the axis of the main pump spindle along the mounting component, and thus can rotate relative to the probe on the main pump spindle. When rotating to the position of the probe, it can be used as a reference to position the probe, determining the relative position between the probe and the main pump spindle. The structure is simple, the positioning method is simple and fast, and the positioning efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0022] Figure 1 is a schematic assembly structure diagram of the main pump spindle, probe, mounting component, probe simulator, and speed sensor in an embodiment of the present invention;

[0023] Figure 2 is Figure 1 a three-dimensional structure diagram during the assembly of the main pump spindle, probe, mounting component, probe simulator, and speed sensor in;

[0024] Figure 3 is Figure 1 a disassembled diagram of the main pump spindle, probe, mounting component, probe simulator, and speed sensor in;

[0025] Figure 4 is Figure 4 a schematic assembly diagram of the base, adjusting member, and cloud platform of the probe simulator in;

[0026] Figure 5 is Figure 1 a schematic diagram of the positions of the probe and the speed sensor in;

[0027] Figure 6 is Figure 1 a schematic diagram of the positions of the probe and the positioning member in;

[0028] Figure 7 is Figure 1 a schematic diagram of the positions of the probe, speed sensor, and positioning member in;

[0029] Figure 8 is an installation diagram of the speed sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] For a clearer understanding of the technical features, objectives, and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the drawings.

[0031] As follows Figures 1 to 3 As shown, the main pump speed probe 1 is fixed on the main pump spindle 2 and can rotate with the main pump spindle 2. Preferably, the probe 1 is provided on the outer wall surface of the main pump spindle 2.

[0032] In one embodiment of the present application, a positioning device for the main pump speed sensor probe is constructed. The positioning device includes a mounting assembly 31 and a probe simulator 32.

[0033] The probe simulator 32 includes a positioning member 321, a base 322, and an adjusting member 323. A positioning head B is provided on the positioning member 321. The positioning member 321 is disposed 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 spindle 2 on the base 322, so that the positioning member 321 can abut against the end and side wall of the probe 1.

[0034] In this embodiment, in order to facilitate the 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.

[0035] The L-shaped positioning head 3211 has a regular shape and easy-to-control dimensions, 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. A first positioning area B1 and a second positioning area B2 can be formed on the positioning head 3211. The first positioning area B1 positions the end of the probe 1, and the second positioning area B2 positions the bottom surface or 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 inside the U-shaped opening can respectively position the end, bottom surface, and top surface of the probe 1.

[0036] 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, and high-strength anti-collision properties; the design of minimizing parts eliminates the assembly error inside the component; and the design of miniaturization, high precision, and high reliability is achieved.

[0037] When the probe simulator 32 moves along the axial and radial directions of the main pump spindle 2, the positioning head B respectively positions the end of the probe 1 and the bottom surface of the probe 1.

[0038] Of course, the positioning head B can also respectively position the end of the probe 1 and the top surface of the probe 1, or respectively position the end of the probe 1, the top surface, and the bottom surface of the probe 1.

[0039] By using the positioning head B, it can be determined that in the cold shutdown condition, after positioning the relative position between the probe 1 and the positioning member 321, 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.

[0040] In some embodiments, the mounting assembly 31 is disposed around the outer periphery of the main pump spindle 2 and is used to position 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 to the main pump spindle 2, providing a positioning reference for the installation of the probe simulator 32.

[0041] The probe simulator 32 is slidably mounted on the mounting assembly 31. The probe simulator 32 can rotate circularly around the axis of the main pump spindle 2 along the mounting assembly 31, so as to 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.

[0042] 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 equivalent 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 be used 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 are 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 of the end face of the main pump spindle 2.

[0043] The mounting assembly 31 is positioned with both 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 the positioning is more accurate. In other embodiments, the mounting assembly 31 can also be positioned with both the outer wall surface and the end face at the upper end of the main pump spindle 2.

[0044] 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.

[0045] In this embodiment, both the annular collar 311 and the mounting feet 312 are provided with mounting grooves A for installing magnets. A plurality of mounting grooves A are circumferentially spaced along the outer wall surface of the annular collar 311 for laterally clamping the magnets.

[0046] 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.

[0047] Further, in this embodiment, the annular collar 311 includes four arc-shaped platforms 3111 that are circumferentially distributed. Each platform 3111 is spliced into a circular ring along the circumference, and two mounting feet 312 are provided on each platform 3111.

[0048] Understandably, in other embodiments, the annular collar 311 may also include two or more other numbers of arc-shaped pedestals 3111 distributed circumferentially. The arc-shaped pedestals 3111 are spliced into a ring circumferentially, and the number of mounting feet 312 on each pedestal 3111 may also be one or more other numbers.

[0049] Furthermore, 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 pedestals 3111.

[0050] Preferably, each lobe of the arc-shaped pedestal 3111 is a single part. The arc-shaped pedestal 3111 is magnetically attracted to the side of the main pump spindle 2, and the mounting feet 312 integrated with the arc-shaped pedestal 3111 are magnetically attracted to the bottom surface of the main pump spindle 2. The arc-shaped pedestal 3111 is made of 316 stainless steel with a machining accuracy of 5 μm, which can prevent rust and corrosion, has high strength against bumps, and has a minimal number of parts design, eliminating the assembly error inside the components; achieving miniaturization, high precision, and high reliability design.

[0051] Preferably, in order to ensure the installation accuracy of the installation assembly 31, the installation assembly 31 is integrally machined and made of the same material of 316 stainless steel to avoid large deformations during placement or movement.

[0052] Preferably, in order to ensure the accurate movement trajectory of the probe simulator 32, a guiding structure for the probe simulator 32 to slide and install is provided on the installation assembly 31, allowing the probe simulator 32 to rotate circularly around the axis of the main pump spindle 2 along the installation assembly 31. Generally, the probe simulator 32 is in sliding fit 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 change of the probe simulator 32 are within a controllable range and do not change significantly.

[0053] Furthermore, the guiding structure is detachably installed on the installation assembly 31 for easy assembly. In this embodiment, the guiding structure is magnetically adsorbed to the installation assembly 31 to improve the adsorption stability. Preferably, the guiding structure is an annular guide rail provided on the annular collar 311 along the circumference of the main pump spindle 2. In some embodiments, the guiding structure is detachably installed on the annular collar 311. Of course, the guiding structure can also be directly formed on the annular collar 311, such as a guiding groove.

[0054] 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.

[0055] Furthermore, the simulation rotation device includes a positioning assembly 31 and a probe simulator 32, and the installation assembly 31 is disposed around the outer periphery of the main pump spindle 2.

[0056] 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, and is used to drive the positioning member 321 to move along the radial and axial directions of the main pump spindle 2 so as to position with the probe.

[0057] The base 322 is slidably installed on the installation assembly 31 and is used to drive the positioning member to slide along the installation assembly. Since the probe simulator 32 can rotate circularly around the main pump spindle 2 along the installation assembly 31, a relative rotation is generated between the probe 1 and the simulation rotating device to simulate the rotation of the probe 1.

[0058] The probe simulator 32 of the simulation rotating device rotates relative to the probe 1 on the main pump spindle 2, and a relative rotation is generated relative to the probe 1, which can simulate the rotation of the probe 1. By using the relative position during the rotation between the two, it can be judged whether the positioning of the probe 1 is accurate. This process can be carried out in the shutdown state of the main pump spindle 2, improving the efficiency.

[0059] Preferably, the adjusting member 323 is magnetically adsorbed and positioned on the base 322. By using magnetic adsorption positioning, further, the adjusting member 323 can also be embedded on the base 322. By combining the methods of embedding and adsorption, the positioning is accurate and the stability is good. It can be understood that the magnetic adsorption or embedding method can also be used alone for positioning.

[0060] When positioning by using the magnetic adsorption method, the magnets can be distributed to make the magnetic suction force more uniform and more balanced. Further, using magnetic adsorption has the following effects:

[0061] 1. The contact surfaces of the two mutually magnetically attracted parts are complete and smooth, which can eliminate the interference to the magnetic adsorption effect and the moving effect;

[0062] 2. The magnetic suction force is evenly distributed, the magnitude of the magnetic suction force can be adjusted, the adsorption is reliable, and it is convenient for installation, disassembly, and the movement of the probe simulator 32;

[0063] 3. On the premise of miniaturization and ensuring strength, the weight of the parts can be reduced, which is beneficial to the lightweight design.

[0064] The base 322 of the probe simulator 32 also uses 316 stainless steel material, and the machining accuracy is 5um; the lower end surface of the base 322 and the annular ring 311 are also installed by magnetic adsorption.

[0065] 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.

[0066] 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 and the base 322 can move axially along the main shaft 2 of the main pump, and the second movable seat 3232 and the first movable seat 3231 can move radially along the main shaft 2 of the main pump. A positioning member 321 is installed on the second movable seat 3232.

[0067] Furthermore, the base 322 is provided with a first guide structure for guiding the first movable seat 3231 so that the first movable seat and the base can move relative to each other, and the first movable seat 3231 is provided with a second guide structure for guiding the second movable seat 3232 so that the second movable seat and the first movable seat can move relative to each other. When the first movable seat and the second movable seat are adjusted, the position adjustment of the positioning member 321 can be realized, which facilitates the adjustment of the position of the positioning member 321 to position the probe 1.

[0068] Preferably, the first guide structure guides along the axial direction of the main pump shaft 2, and the second guide structure guides along the radial direction of the main pump shaft 2. One guides along the axial direction of the main pump shaft 2, and the other guides along the radial direction of the main pump shaft 2. This allows the positioning member 321 to be adjusted in different directions, making the adjustment more accurate and flexible. For example, the first guide structure includes a guide rail arranged between the base and the first movable seat, and the guide rail extends along the axial direction of the main pump shaft 2, so that the first movable seat can reciprocate along the axial direction of the main pump shaft 2 relative to the base, thereby driving the positioning member to reciprocate along the axial direction of the main pump shaft 2; the second guide structure includes a guide rail arranged between the second movable seat and the second movable seat, and the guide rail extends along the radial direction of the main pump shaft 2, so that the second movable seat can reciprocate along the radial direction of the main pump shaft 2 relative to the first movable seat, thereby driving the positioning member to reciprocate along the radial direction of the main pump shaft 2. In other embodiments, the guiding directions of the first guide structure and the second guide structure can also be at an angle to facilitate adjusting the position of the positioning member 321 in different directions.

[0069] Of course, in other embodiments, the first guiding structure may be a guiding groove, or a combination of a guiding groove and a guiding rail, as long as it can provide stable guiding. Further, the second guiding structure may be a guiding groove, or a combination of a guiding groove and a guiding rail, so as to provide stable guiding.

[0070] 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 positioning head 3211 is moved.

[0071] 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.

[0072] The measuring component 324 of the probe simulator 32 can be a miniaturized precision pan-tilt, usually with the model LE40-L, which can be used to detect the moving displacement of the base 322 and the adjusting member 323. The moving range of this pan-tilt is 10 mm.

[0073] In this embodiment, the first adjusting member 3241 and the second adjusting member 3242 can be respectively the knobs on two pan-tilts. By rotating the knobs, the position adjustment and movement of the positioning member 321 on the adjusting member 323 are realized.

[0074] 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.

[0075] 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 matching the outer wall surface of the main pump spindle 2 is provided on the base 322. By using the surface of the main pump spindle 2 for positioning, the reference is stable and deviation is not likely to occur.

[0076] Preferably, the positioning surface D on the base 322 is an arc surface and matches the outer shape of the outer wall surface of the main pump spindle 2. The positioning is realized by relying on the positioning surface D to fit onto the outer wall surface of the main pump spindle 2. In other embodiments, several positioning protrusions may 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 realize the positioning of the base 322.

[0077] Further, the installation component 31 is positioned with respect to the end face and the outer ring of the main pump spindle 2, and the base 322 is magnetically adsorbed onto the installation component 31. The base 322 is also positioned by relying on the installation component 31, making the positioning more stable and reliable.

[0078] After the probe simulator 32 completes the positioning of the probe 1, the rotational speed of the probe 1 can be detected by the rotational speed sensor 4.

[0079] Generally, the rotational speed sensor 4 adopts a 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, and the sensing groove 41 penetrates along the circumferential direction of 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 simultaneously inserted and pass through during the rotation process.

[0080] Combined Figures 5 to 8 As shown, the present application also discloses a main pump rotational speed sensor calibration device for calibrating the rotational speed sensor of the main pump spindle 2. A probe 1 is provided on the outer wall surface of the main pump spindle 2. The rotational speed sensor 4 is provided with a circumferentially penetrating sensing groove 41 at one end opposite to the main pump spindle 2, and the sensing groove is used for the probe to rotate through.

[0081] The calibration device includes a mounting bracket 5 and a probe simulator 32. The mounting bracket 5 is provided on the main pump housing and is used for mounting the rotational speed sensor 4 to allow the rotational speed sensor 4 to detect the rotational speed of the probe 1 rotating with the main pump spindle 2.

[0082] The probe simulator 32 includes a positioning head 3211 for positioning the probe 1 and a measurement component 324. The positioning head rotates through the sensing groove, and the measurement 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.

[0083] 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 operating 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 measurement.

[0084] Preferably, the mounting bracket 5 is mounted 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 position of the rotational speed sensor 4 relative to the probe 1 can be adjusted.

[0085] 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 assembly 324, the positioning head 3211 is moved. While moving, the measuring assembly 324 can measure the moving displacement of the positioning head 3211 to obtain the relative positions before and after the movement. The measuring assembly 324 obtains the distances from the positioning head 3211 to the axial inner wall and the radial bottom wall of the sensing groove 41.

[0086] Preferably, the position of the rotational speed sensor 4 on the mounting bracket 5 is adjustable, and the relative positions 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 requirement for the rotational speed sensor 4 to perform normal rotational speed detection on the probe 1.

[0087] In some embodiments, the rotational speed sensor 4 is provided with a first mounting hole 42. 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 be laterally adjusted in position relative to the first locking member to enable the rotational speed sensor 4 to meet the relative position requirements with respect to the probe 1.

[0088] Furthermore, in this embodiment, the axial direction of the first mounting hole 42 is the same as the penetrating 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 enabling the rotational speed sensor 4 to be adjusted in the horizontal and vertical directions relative to the probe 1. At the same time, the swinging direction of the rotational speed sensor 4 can also be adjusted.

[0089] Preferably, the mounting bracket 5 is provided with a second mounting hole 51. 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 be laterally adjusted in position relative to the second locking member to enable the rotational speed sensor 4 to meet the relative position requirements with respect to the probe 1.

[0090] Furthermore, in order to achieve multi-directional adjustment, the axial direction of the first mounting hole 42 and the axial direction of the second mounting hole 51 form an angle, and the axial direction of the second mounting hole 51 is the same as the axial direction of the main pump spindle 2, enabling the rotational speed sensor 4 to be adjusted in the horizontal direction relative to the probe 1. At the same time, the swinging direction of the rotational speed sensor 4 can also be adjusted.

[0091] Generally, since the relative positions between the main pump rotational speed probe 1 and the main pump rotational speed sensor 4 directly affect the measurement accuracy and stability, there are strict requirements for the installation of the main pump rotational speed probe 1 and the main pump rotational speed sensor 4.

[0092] Rotate the main pump spindle 2 to place the main pump speed probe 1 at the middle position of the sensing slot 41 of the main pump speed sensor 4, and it is necessary to measure the clearance. The measured clearance includes the upper clearance of the sensing slot 41, the lower clearance of the sensing slot 41, and the clearance between the probe 1 and the bottom of the sensing slot 41 to determine whether the installation standard requirements are met.

[0093] Furthermore, in another embodiment of the present application, a method for installing the spindle speed sensor 4 is also disclosed, including the following steps:

[0094] Rotate the probe simulator 32 in a circular motion around the axis of the main pump spindle 2 until it is inside the sensing slot 41 of the speed sensor 4;

[0095] 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 slot 41 opposite to the main pump spindle 2, lock the mounting bracket 5 to obtain the top clearance d of the sensing slot x ;

[0096] When the positioning head 3211 contacts the lower side surface of the sensing slot 41, obtain the lower clearance h of the sensing slot dy ;

[0097] When the positioning head 3211 contacts the upper side surface of the sensing slot 41, obtain the upper clearance h of the sensing slot uy ;

[0098] Confirm that the upper clearance h of the sensing slot uy and the lower clearance h of the sensing slot dy meet the requirements. Otherwise, adjust the vertical position of the speed sensor 4 until the upper clearance h of the sensing slot uy and the lower clearance h of the sensing slot dy meet the requirements, and then lock the mounting bracket 5.

[0099] Furthermore, the upper clearance of the sensing slot satisfies the formula: h uy = Δh uy + h sy - h hy , where Δh uy is the upward displacement of the sensing slot, h sy is the height of the vertical side of the positioning head 3211, and h hy is the height of the horizontal side of the positioning head 3211;

[0100] The requirement for the upper clearance of the sensing slot satisfies the range: h ub ± h uj , where h ub is the installation standard value of the upper clearance of the sensing slot, and h uj is the installation accuracy of the upper clearance of the sensing slot;

[0101] During the adjustment process, if the upper clearance of the sensing slot satisfies: h ub - huj ≤h uy ≤h ub +h uj , the installation of the rotational speed sensor meets the installation requirements.

[0102] Furthermore, the lower gap of the sensing groove satisfies the formula: h dy = Δh dy +h hy , where h dy is the lower gap of the sensing groove, h hy is the height of the horizontal side of the positioning head 3211, and Δh dy is the downward displacement of the sensing groove;

[0103] The required range of the lower 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;

[0104] During the adjustment process, if h db -h dj ≤h dy ≤h db +h dj , the installation requirements are met.

[0105] Furthermore, the thickness h sx of the vertical side of the positioning head 3211 = d b , where h sx is the thickness of the vertical side of the positioning head 3211, and d b is the installation standard value of the top gap of the sensing groove;

[0106] Adjust the second locking part. When the top plane of the U-shaped sensing groove contacts the vertical plane of the positioning head 3211, lock the second locking part. This method ensures that the top gap d x of the sensing groove = d b , and the required range of the top gap of the sensing groove d b ±d j is achieved, where d j is the installation accuracy of the top gap of the sensing groove, and the installation requirements are met;

[0107] During the adjustment process, if the height h hy of the horizontal side of the positioning head 3211 = h db -0.8*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,

[0108] This height design ensures that the positioning part 321 can enter the sensor sensing groove 41 normally, while ensuring a qualified margin of 0.2*h dj , thus meeting the installation requirements;

[0109] If the vertical side height h 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;

[0110] h hy is the horizontal side height of the positioning head 3211, h sy is the vertical side height of the positioning head 3211, h db is the installation standard value of the lower gap of the sensing groove, h dj is the installation accuracy of the lower gap of the sensing groove.

[0111] The speed sensor 4 is installed on the mounting bracket 5 through the first locking part, and the mounting bracket 5 is installed on the main pump pump body through the second locking part. The second locking part can adjust the forward and backward movement of the speed sensor 4; the first locking part can adjust the forward and backward movement, upward and downward movement, and rotation at a certain angle of the sensor.

[0112] During installation, first position the second locking part, and the second locking part adjusts the top gap d of the type groove x . If the upper gap h of the sensing groove, h uy , the lower gap h of the sensing groove dy , and the top gap d of the sensing groove x all meet the installation standard requirements, then there is no need to adjust the first locking part anymore. If they do not meet the installation standard requirements, then the first locking part needs to be adjusted.

[0113] The gap between the speed sensor 4 and the probe 1 is measured and confirmed during the start-up state of the 2.5Mpa jacking oil pump on the platform.

[0114] The outer shape of the measuring part used for measurement is the same as the outer dimension of the positioning head of the positioning part 321. The measuring part is a high-precision machined part, and the specific dimensions of the measuring part are:

[0115] The horizontal side height h of the measuring part hy =h db -h dj , where h db is the installation standard value of the lower gap of the sensing groove, h dj is the installation accuracy of the lower gap of the sensing groove;

[0116] The vertical side height h of the measuring part sy ≥h t , and the thickness of the probe 1 is h t =4±0.1mm;

[0117] Measure the vertical edge 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.

[0118] Specifically, it includes the following measurement steps:

[0119] Rotate the main pump spindle 2 to rotate the probe 1 to the sensing groove 41 of the rotational speed sensor 4;

[0120] 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;

[0121] Use a high-precision two-dimensional moving device to make the top plane of the probe 1 contact the inner plane of the vertical edge of the measuring piece, and the lower plane of the probe 1 contact the upper plane of the horizontal edge of the measuring piece to obtain the reference positioning of the measuring piece;

[0122] When the U-shaped top plane contacts the outer plane of the vertical edge of the measuring piece, the top clearance of the sensing groove is obtained;

[0123] Use a high-precision two-dimensional moving device to make the lower plane of the horizontal edge of the measuring piece contact the lower plane of the sensing groove 41 to obtain the lower clearance of the sensing groove;

[0124] Use a high-precision two-dimensional moving device to make the upper plane of the speed edge of the measuring piece contact the upper plane of the sensing groove 41 to obtain the upper clearance of the sensing groove.

[0125] The measuring piece is installed on a high-precision two-dimensional moving device to realize the movement in two-dimensional directions of the x-axis and y-axis, and at the same time, the movement amount is measured with high precision.

[0126] 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 edge of the positioning head 3211, and h hy is the height of the horizontal edge of the positioning head 3211;

[0127] 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, and h uj is the installation accuracy of the upper clearance of the sensing groove;

[0128] If hub -h uj ≤ h uy ≤ h ub +h uj , the installation requirements are met, and green is displayed on the display screen; otherwise, red is displayed.

[0129] The lower gap h of the sensing groove dy = Δh dy +h hy , where h dy is the lower gap of the sensing groove, and h hy is the height of the horizontal side of the positioning head 3211, and Δh dy is the downward displacement of the sensing groove;

[0130] The requirement 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;

[0131] 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.

[0132] The top gap d of the sensing groove x = h sx +Δd x ;

[0133] The requirement 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, and d b is the installation standard value of the top gap of the sensing groove, and d j is the installation accuracy of the top gap of the sensing groove;

[0134] 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.

[0135] Among them, the upward displacement Δh of the sensing groove uy , the downward displacement Δh of the sensing groove dy , the forward displacement Δd of the top gap of the sensing groove x .

[0136] It has the following innovative points:

[0137] ① The calibration device features miniaturization, lightweight, anti-collision, anti-rust and anti-corrosion, simple on-site operation, extremely few parts, high precision, and high reliability.

[0138] ② There is no mechanical interference between the calibration device and the displacement sensor, and there is no mechanical interference between the calibration device, the probe 1 and the rotational speed sensor 4.

[0139] ③ Under the cold shutdown condition, no matter where the probe 1 is located on the main shaft, with only one simple installation of the calibration device, it can quickly realize the rotation simulation of the main pump main shaft 2, 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, and if the data is unqualified, it is marked in red, thus realizing the calibration and installation of the rotational speed sensor 4.

[0140] 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; with the design of extremely few parts, it eliminates the internal assembly error of components, and realizes miniaturization, high precision and high reliability design; made of 316 material, anti-collision, anti-rust and anti-corrosion.

[0141] ⑤ No tools are required for on-site installation and disassembly of the calibration device; 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 attraction 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, and the turntable 3111 all adopt a magnetic attraction method; the magnetic attraction adopts a magnet-embedded, distributed and programmable design scheme.

[0142] 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 attraction 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 of appropriate size, the magnetic attraction distribution is uniform, the installation and disassembly are convenient, and the adsorption is reliable; the magnetic attraction force between the cloud platform base of the measurement component 324 and the side of the main shaft, and the turntable 3111 is of appropriate size, the magnetic attraction distribution is uniform, the installation, disassembly and movement are convenient, and the adsorption is reliable. The contact surfaces with mutual magnetic attraction have no openings or grooves, and are complete and smooth.

[0143] The installation and adjustment window of the main pump rotational 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 refueling overhaul, directly affecting the refueling overhaul period 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 line time of refueling overhaul can be saved, effectively improving the power generation of the nuclear power unit, and having significant economic and social benefits.

[0144] By studying the main pump speed sensor calibration device and method under cold shutdown conditions, the calibration of the main pump speed sensor 4 can be achieved under cold shutdown conditions, and the production process can be optimized and improved, creating huge production value. At the same time, the existing main pump speed sensor calibration methods are applicable to domestic multi-site nuclear power units and foreign French EDF nuclear power units, and the research results have significant reference and learning significance, with extensive promotion and application value.

[0145] It can be understood that the above technical features can be combined arbitrarily without limitation.

[0146] The above are only embodiments of the present invention, and do not 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 be equally included in the patent protection scope of the present invention.

Claims

1. A probe positioning device for a main pump speed sensor, which is used to position a probe (1) installed on the main pump spindle (2), characterized in that The positioning device includes a probe simulator (32) and a mounting assembly (31) arranged around the outer periphery of the main pump spindle (2). The probe simulator (32) includes a positioning member (321), a base (322) and an adjusting member (323). The positioning member (321) is arranged on the base (322). The adjusting member (323) is used to adjust the axial and radial movement of the positioning member (321) on the base (322) along the main pump spindle (2) so that the positioning member (321) can abut against the end and side wall of the probe (1). The base (322) is slidably mounted on the mounting assembly (31).

2. The main pump speed sensor probe positioning device according to claim 1, characterized in that The positioning member (321) includes a positioning head (B). The positioning head (B) includes a first section (B1) and a second section (B2) which 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).

3. The main pump speed sensor probe positioning device according to claim 1, wherein 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) relative to the base (322). The second movable seat (3232) can move radially along the main pump spindle (2) relative to the first movable seat (3231). The positioning member (321) is mounted on the second movable seat (3232).

4. The main pump speed sensor probe positioning device according to claim 3, wherein, The base (322) is provided with a first guiding structure for guiding the first movable seat (3231), and the first movable seat (3231) is provided with a second guiding structure for guiding the second movable seat (3232). 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).

5. The main pump speed sensor probe positioning device according to claim 4, characterized in that The first guiding structure is a guide groove and / or a guide rail, and the second guiding structure is a guide groove and / or a guide rail.

6. The main pump speed sensor probe positioning device according to any one of claims 3 to 5, characterized in that The probe simulator (32) 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.

7. The main pump speed sensor probe positioning device according to any one of claims 1 to 5, characterized in that, The base (322) is provided with a positioning surface (D) which cooperates with the outer wall surface of the main pump spindle (2).

8. The main pump speed sensor probe positioning device according to claim 7, characterized in that, The positioning surface (D) is an arc surface and matches the outer wall surface shape of the main pump spindle (2).

9. The main pump speed sensor probe positioning device according to claim 1, characterized in that The mounting assembly (31) includes an annular ring (311) and mounting feet (312). The annular ring (311) is used for detachably connecting with the outer ring of the main pump spindle (2). The mounting feet (312) are connected to the annular ring (311) and extend towards the inner ring of the annular ring (311). The mounting feet (312) are used for detachably connecting with the end face of the main pump spindle (2). The annular ring (311) and / or the mounting feet (312) are used for magnetically connecting with the main pump spindle (2).

Images