Vertical pump shafting vibration characteristic monitoring device

Abstract

The utility model discloses a vertical pump shafting vibration characteristic monitoring device which comprises a first vibration pickup mechanism, a second vibration pickup mechanism and a tile vibration monitoring mechanism. The first vibration pickup mechanism comprises a first support unit arranged at the non-driving end of a motor of the vertical pump and a first sensor unit arranged on the first support unit, and the first sensor unit collects shaft vibration parameters and rotating speed parameters of a rotating shaft at the non-driving end of the motor. The second vibration pick-up mechanism comprises a second support unit arranged on a coupler shell or a pump body shell of the vertical pump and a second sensor unit arranged on the second support unit, and the second sensor unit collects shaft vibration parameters of a coupler or a pump shaft; the bearing vibration monitoring mechanism comprises a base unit arranged at the position of a bearing of the vertical pump and a third sensor unit arranged on the base unit, and the third sensor unit collects bearing vibration parameters at the position of the bearing. The three sensor units are integrated at different positions of the vertical pump, and comprehensive monitoring of the vibration characteristics of the vertical pump shafting is achieved.

Description

Technical Field

[0001] This utility model relates to the field of vertical pump technology, and in particular to a vertical pump shaft vibration characteristic monitoring device. Background Technology

[0002] Vibration monitoring of large vertical pump units in nuclear power plants primarily relies on manual inspections, using handheld vibration meters to periodically collect data. This method has drawbacks such as long monitoring cycles, limited data volume, difficulty in capturing transient anomalies, and isolated data. When abnormal vibration occurs in the pump unit, it is impossible to accurately determine the cause of the anomaly immediately. Furthermore, due to the long shaft system and complex structure of vertical pump units, with measuring points distributed across multiple floors, manual inspection is extremely inconvenient. Existing technologies for monitoring the vibration characteristics of vertical pumps often focus on monitoring single parameters, such as shaft runout or motor verticality, failing to comprehensively reflect the shaft vibration characteristics of the vertical pump unit—in other words, the monitoring is incomplete. Due to the lack of comprehensive historical vibration data and an integrated shaft system monitoring method, the causes of vibration anomalies are difficult to diagnose. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a vertical pump shaft vibration characteristic monitoring device, which addresses at least one of the defects mentioned in the background art.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: A vertical pump shaft vibration characteristic monitoring device is constructed, comprising a first vibration pickup mechanism, a second vibration pickup mechanism, and a bearing vibration monitoring mechanism. The first vibration pickup mechanism includes a first support unit and a first sensor unit. The first support unit is disposed at the non-driving end of the motor of the vertical pump, and the first sensor unit is disposed on the first support unit. The first sensor unit is used to collect shaft vibration parameters and rotational speed parameters of the shaft at the non-driving end of the motor. The second vibration pickup mechanism includes a second support unit and a second sensor unit. The second support unit is disposed on the coupling housing between the gearbox and the pump body of the vertical pump, and the second sensor unit is disposed on the second support unit. The second sensor unit is used to collect shaft vibration parameters of the coupling. Alternatively, the second support unit is disposed on the pump body housing of the vertical pump, and the second sensor unit is disposed on the second support unit. The second sensor unit is used to collect shaft vibration parameters of the pump shaft. The bearing vibration monitoring mechanism includes a base unit and a third sensor unit. The base unit is disposed at the bearing position of the vertical pump, and the third sensor unit is disposed on the base unit. The third sensor unit is used to collect bearing vibration parameters at the bearing position.

[0005] In some embodiments, the first sensor unit includes a first shaft vibration sensor and a rotation speed sensor disposed on the first support unit.

[0006] In some embodiments, the first sensor unit includes at least two first shaft vibration sensors; two adjacent first shaft vibration sensors are distributed at an angle of 85 to 95° along the circumference of the rotating shaft.

[0007] In some embodiments, the speed sensor is an eddy current displacement sensor, and the first sensor unit further includes a probe; the probe has a mounting hole that is adapted to a bolt on the thrust head of the non-drive end of the motor, and the probe is mounted on the thrust head through the cooperation of the mounting hole and the bolt; the probe is fitted to the outer peripheral surface of the rotating shaft; the probe can rotate relative to the speed sensor together with the rotating shaft and the thrust head.

[0008] In some embodiments, the first support unit is mounted on the motor body ring at the non-driving end of the motor. The first support unit is provided with a plurality of first through holes, which are spaced apart along the axial direction of the rotating shaft. The first shaft vibration sensor and the speed sensor are mounted and fixed through the first through holes.

[0009] In some embodiments, the first support unit includes at least two first supports, which are spaced apart circumferentially along the motor body ring. Each first support is provided with a plurality of first through holes. Each first support is also provided with a second through hole, which is adapted to a plurality of first bolt holes spaced apart circumferentially on the motor body ring. Each first support is detachably mounted on the motor body ring at a position corresponding to any of the first bolt holes by passing a first fastener through the second through hole and at least one of the first bolt holes.

[0010] In some embodiments, the second support unit is sleeved on the outer periphery of the coupling housing and is fastened to the pump body housing or the coupling housing by a second fastener; or, the second support unit is sleeved on the outer periphery of the pump body housing and is fastened to the pump body housing by a second fastener and a third bolt hole.

[0011] In some embodiments, the second support unit includes a support body and at least two second supports; the support body is sleeved on the outer periphery of the coupling housing and is fastened to the pump body housing or the coupling housing by a second fastener; or, the support body is sleeved on the outer periphery of the pump body housing and is fastened to the pump body housing by a second fastener and a third bolt hole; the support body is provided with a plurality of mounting positions, and each second support and each mounting position are detachably connected; the second sensor unit includes at least two second shaft vibration sensors, and the second shaft vibration sensors and the second supports are mounted together in a one-to-one correspondence; two adjacent second shaft vibration sensors are distributed at an angle of 85 to 95° along the circumference of the coupling housing or the pump body housing.

[0012] In some embodiments, each of the second brackets is provided with a mounting groove, the second shaft vibration sensor is fitted with the mounting groove, and the second shaft vibration sensor is slidable along the mounting groove to change its radial distance with the coupling or with the pump shaft; and / or, each of the second brackets is provided with an oil guide groove.

[0013] In some embodiments, the base unit includes a plurality of bases, which are disposed at at least one of the following positions: the bearing position at the non-drive end of the motor of the vertical pump, the bearing position at the drive end of the motor, the bearing position at the drive end of the gearbox, the bearing position at the non-drive end of the gearbox, and the bearing position on the pump body side; the third sensor unit includes a plurality of acceleration sensors, which are mounted together with the bases in a one-to-one correspondence.

[0014] This invention offers at least the following advantages: The first, second, and third sensor units integrated on the vertical pump can collect shaft vibration parameters, speed parameters, and bearing vibration parameters at different locations in real time, replacing manual inspection and acquiring more real-time data. This solves the problems of data isolation and inconvenience caused by manual inspection. By integrating the first, second, and third sensor units at different locations on the vertical pump, the vibration parameters of the shaft at the non-drive end of the motor, the shaft vibration parameters at the coupling or pump shaft, and the bearing vibration parameters at the bearing location can be simultaneously acquired. This enables comprehensive monitoring of the vibration characteristics of the vertical pump shaft system, providing multi-dimensional vibration characteristic parameter support and solving the problem of incomplete monitoring caused by focusing on only a single parameter in existing technologies. Therefore, by integrating multiple sensor units at different locations on the vertical pump, multi-dimensional vibration characteristic parameters of the vertical pump can be collected, thereby establishing a comprehensive historical vibration database and an integrated shaft system monitoring method, which is beneficial for accurately analyzing the causes of abnormal vibration in the vertical pump. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this utility model, the following will further describe this utility model in conjunction with the accompanying drawings and embodiments. In the drawings:

[0016] Figure 1 This is a structural diagram of a vertical pump used in nuclear power plants;

[0017] Figure 2 This is a schematic diagram of the assembly structure of the first vibration pickup mechanism on the non-drive end of the motor of the vertical pump in some embodiments of this utility model.

[0018] Figure 3 yes Figure 2 The diagram shows the structure of the probe.

[0019] Figure 4 yes Figure 2 A partial structural diagram;

[0020] Figure 5 This is a schematic diagram of the structure of the second vibration pickup mechanism in some embodiments of this utility model;

[0021] Figure 6 yes Figure 1 Enlarged structural diagram of section A. Detailed Implementation

[0022] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. When an element is referred to as being "on" or "below" another element, the element can be located "directly" or "indirectly" on the other element, or there may be one or more intermediary elements. The terms "first," "second," and "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] Please see Figure 1A vertical pump for a nuclear power plant includes a motor 1, a gearbox 3, a coupling 4, and a pump body 5, which are connected sequentially from top to bottom. The motor 1 has a driving end and a non-driving end. The driving end of the motor 1 is connected to the gearbox 3, and the end of the motor 1 furthest from the gearbox 3 is the non-driving end. The non-driving end of the gearbox 3 is connected to the driving end of the motor 1, and the driving end of the gearbox 3 is connected to the coupling 4. The pump body 5 has a pump shaft 2, which is connected to the coupling 4.

[0024] In some embodiments, this utility model provides a vertical pump shaft vibration characteristic monitoring device. This vertical pump shaft vibration characteristic monitoring device can be applied to large vertical pump units in nuclear power plants. The vertical pump shaft vibration characteristic monitoring device includes a first vibration pickup mechanism, a second vibration pickup mechanism, and a bearing vibration monitoring mechanism.

[0025] The first vibration pickup mechanism includes a first support unit 61 and a first sensor unit. The first support unit 61 is located at the non-driving end of the motor 1 of the vertical pump, and the first sensor unit is mounted on the first support unit 61. The first sensor unit is used to collect the shaft vibration parameters and rotational speed parameters of the shaft 11 at the non-driving end of the motor 1. The shaft vibration parameters of the shaft 11 refer to the radial vibration displacement or radial vibration velocity of the shaft 11. When studying the vibration characteristics of the vertical pump shaft system, the rotational speed parameters of the shaft 11 of the motor 1 are also a necessary factor to consider.

[0026] The second vibration detection mechanism includes a second support unit 71 and a second sensor unit. In a first embodiment, the second support unit 71 is mounted on the coupling 4 between the gearbox 3 and the pump body 5 of the vertical pump, and the second sensor unit is mounted on the second support unit 71. The second sensor unit is used to collect the shaft vibration parameters of the coupling 4. Alternatively, in a second embodiment, the second support unit 71 is mounted on the pump body housing of the vertical pump, and the second sensor unit is mounted on the second support unit 71. The second sensor unit is used to collect the shaft vibration parameters of the pump shaft 2. That is, since the pump shaft 2 and the coupling 4 are coaxially connected, either the pump shaft 2 or the coupling 4 can be selected as the shaft vibration monitoring object of the second sensor unit. The shaft vibration parameters of the coupling 4 refer to the radial vibration displacement or radial vibration velocity of the coupling 4. The shaft vibration parameters are measured in peak-to-peak values ​​(µm ppk), with the peak-to-peak value (double amplitude) of the bearing housing vibration as the evaluation scale. The shaft vibration parameters of the pump shaft 2 are similarly measured.

[0027] The bearing vibration monitoring mechanism consists of a base unit and a third sensor unit. The base unit is located at the bearing position of the vertical pump, and the third sensor unit is mounted on the base unit. The third sensor unit is used to collect bearing vibration parameters at the bearing position. Bearing vibration refers to the vibration of the bearing housing, or simply bearing vibration. Bearing vibration is measured in velocity values ​​(mm / s rms), with the effective value of the bearing housing vibration serving as the evaluation metric. The bearing vibration parameters at the bearing position refer to the vibration parameters at the location of the bearing in the vertical pump (i.e., the location of the corresponding bearing housing).

[0028] In summary, the first, second, and third sensor units integrated on the vertical pump can collect shaft vibration parameters, speed parameters, and bearing vibration parameters at different locations in real time, replacing manual inspection and acquiring more real-time data. This solves the problems of data isolation and inconvenience caused by manual inspection. By integrating the first, second, and third sensor units at different locations on the vertical pump, the shaft vibration and speed parameters of the shaft 11 at the non-drive end of motor 1, the shaft vibration parameters at coupling 4 or pump shaft 2, and the bearing vibration parameters at the bearing locations can be simultaneously acquired. This enables comprehensive monitoring of the vertical pump shaft system vibration characteristics, providing multi-dimensional vibration characteristic parameter support and solving the problem of incomplete monitoring caused by focusing on only a single parameter in existing technologies. Therefore, by integrating multiple sensor units at different locations on the vertical pump, multi-dimensional vibration characteristic parameters of the vertical pump can be collected, thereby establishing a comprehensive historical vibration database and an integrated shaft system monitoring method, which is beneficial for accurately analyzing the causes of abnormal vibration in the vertical pump.

[0029] like Figure 2 As shown, the non-drive end of the motor 1 of a large vertical pump in a nuclear power plant includes a dust cover (not shown), a rotating shaft 11, a thrust head 12, and a motor body ring 13. The rotating shaft 11, thrust head 12, and motor body ring 13 are located inside the dust cover. The first support unit 61 and the first sensor unit are also located inside the dust cover. The diameter of the rotating shaft 11 is smaller than the diameter of the thrust head 12, and the diameter of the thrust head 12 is smaller than the diameter of the motor body ring 13. The thrust head 12 is fitted around the outer circumference of the rotating shaft 11, and the motor body ring 13 is fitted around the outer circumference of the thrust head 12. The rotating shaft 11 and the thrust head 12, as a whole, can rotate relative to the motor body ring 13. That is, when the rotating shaft 11 rotates, it drives the thrust head 12 to rotate together, while the motor body ring 13 remains stationary. Multiple bolts 120 are pre-installed on the upper end face of the thrust head 12 for fastening to other components. Figure 2In the illustrated embodiment, the first support unit 61 is mounted and fixed on the motor body ring 13. The probe end of the first sensor unit faces the outer peripheral surface of the rotating shaft 11 and the thrust head 12. The rotating shaft 11 and the thrust head 12, as a whole, can rotate relative to the first sensor unit, thereby enabling the first sensor unit to collect the shaft vibration parameters and rotational speed parameters of the rotating shaft 11 at the non-drive end of the motor 1.

[0030] like Figure 2 As shown, in some embodiments, the first sensor unit includes a first shaft vibration sensor 621 and a speed sensor 622 disposed on the first support unit 61. The first shaft vibration sensor 621 is used to collect the shaft vibration parameters of the shaft 11 at the non-drive end of the motor 1, and the speed sensor 622 is used to collect the speed parameters of the shaft 11 at the non-drive end of the motor 1. Understandably, the vibration of the shaft 11 causes a change in the gap between the first shaft vibration sensor 621 and the shaft, and this change in gap can be mapped to a change in shaft vibration parameters. For each revolution of the shaft 11, the speed sensor 622 triggers a pulse signal, which can be mapped to a change in speed parameters.

[0031] The number of first shaft vibration sensors 621 and speed sensors 622 can each be one or more. Alternatively, in some other embodiments, the same sensor can be used to simultaneously acquire shaft vibration parameters and speed parameters. For example, some eddy current sensors, combined with corresponding signal processing circuits or algorithms, such as AC / DC separation technology, can simultaneously acquire shaft vibration parameters and speed parameters through signal separation. Specifically, the speed is calculated by detecting the keyway pulse signal; the shaft vibration displacement is analyzed by the AC vibration signal. To ensure measurement accuracy and reliability, independent first shaft vibration sensors 621 and speed sensors 622 can be used to acquire shaft vibration parameters and speed parameters respectively.

[0032] like Figure 2 As shown, in some embodiments, the first sensor unit includes at least two first shaft vibration sensors 621 and at least one speed sensor 622. The probe end of each first shaft vibration sensor 621 faces the outer peripheral surface of the thrust head 12 and has a certain gap with it. Each first shaft vibration sensor 621 can detect the change in the gap value between its probe end and the outer peripheral surface of the thrust head 12 in real time, thereby reflecting the change in the shaft vibration parameters of the thrust head 12. Since the thrust head 12 and the rotating shaft 11 rotate as a whole, the change in the shaft vibration parameters of the thrust head 12 can be mapped to the change in the shaft vibration parameters of the rotating shaft 11. The probe end of the speed sensor 622 faces the outer peripheral surface of the rotating shaft 11. When the rotating shaft 11 rotates, the speed sensor 622 can directly measure the speed parameters of the rotating shaft 11.

[0033] Two adjacent first shaft vibration sensors 621 are spaced at an angle of 85° to 95° along the circumference of the rotating shaft 11. Specifically, assuming the radial line connecting one first shaft vibration sensor 621 and the axis of the rotating shaft 11 is L1, and the radial line connecting the other adjacent first shaft vibration sensor 621 and the axis of the rotating shaft 11 is L2, then L1 and L2 form an angle of 85° to 95°. That is, the two adjacent first shaft vibration sensors 621 are roughly orthogonally distributed, and can measure the vibration displacement in two mutually perpendicular directions (X and Y directions) respectively. By combining the data from both, the composite vibration trajectory of the rotating shaft 11 can be calculated, thereby realizing multi-dimensional signal fusion, dynamic compensation, and redundancy design, ensuring comprehensive monitoring and accurate diagnosis of the vibration of the rotating shaft system.

[0034] The first shaft vibration sensor 621 can be any one of an eddy current displacement sensor, a magnetoelectric displacement sensor, or a laser displacement sensor. Similarly, the speed sensor 622 can be any one of an eddy current displacement sensor, a magnetoelectric displacement sensor, or a laser displacement sensor. Specifically, the magnetoelectric displacement sensor needs to be used in conjunction with a magnet mounted on the outer circumference of the rotating shaft 11. Some models of large vertical pumps have a pre-drilled groove on the rotating shaft 11 of the motor 1 at the factory. A magnet is installed in the groove, which allows the magnetoelectric displacement sensor to be used to measure the speed or shaft vibration parameters. For example, for each revolution of the rotating shaft 11, the magnetoelectric displacement sensor and the magnet trigger an electromagnetic induction signal, and the magnetoelectric displacement sensor triggers a pulse accordingly, thereby measuring the speed of the rotating shaft 11. If the rotating shaft 11 of the vertical pump does not have a pre-drilled groove, then an eddy current displacement sensor or a laser displacement sensor can be used to measure the speed or shaft vibration parameters. The laser displacement sensor utilizes the monochromaticity (wavelength at the nm level) and precision characteristics of laser light. It works by using the principle that the change in the angle of the reflected laser light as the measured object moves causes a change in the position of the laser light on the plate, thus detecting the amount and rate of change of axial displacement at the corresponding location. Eddy current displacement sensors have certain requirements for the smoothness of the surface of the rotating shaft 11 they monitor. For example, the surface cannot be too rough, there should only be one groove or protrusion on the shaft surface at the same elevation, and there should be no obvious scratches. Laser displacement sensors, however, do not have special requirements for the smoothness of the surface of the rotating shaft 11 they monitor. Typically, the monitoring distance of an eddy current displacement sensor is 1.27 mm; the laser displacement sensor has a longer monitoring distance, around 80 mm. Therefore, the selection of the first shaft vibration sensor 621 and the speed sensor 622 can be determined based on factors such as the smoothness of the surface of the monitored shaft 11, whether there are grooves on the surface of the monitored shaft 11, the required monitoring distance, the required frequency range, and the required sensitivity.

[0035] like Figure 2 As shown, in some embodiments, the speed sensor 622 is an eddy current displacement sensor. Correspondingly, the first sensor unit also includes a probe 623 used in conjunction with the eddy current displacement sensor. The probe 623 can be L-shaped. The probe 623 has a mounting hole 624, which is adapted to the bolt 120 on the thrust head 12. The probe 623 is mounted on the thrust head 12 through the engagement of the mounting hole 624 and the bolt 120. Thus, the probe 623 can be mounted using the inherent structure of the large vertical pump in the nuclear power plant (the bolt 120 on the thrust head 12) and used in conjunction with the eddy current displacement sensor to measure the rotational speed of the shaft 11. This is suitable for situations where the shaft 11 of the motor 1 of the vertical pump does not have a pre-reserved concave groove, and no modification to the inherent structure of the large vertical pump in the nuclear power plant is required.

[0036] The probe 623 and the outer peripheral surface of the rotating shaft 11 are fitted together. Specifically, as shown... Figure 3 As shown, in some embodiments, the surface of the probe 623 facing the rotating shaft 11 has an arc-shaped surface 625, which is adapted to the shape of the outer peripheral surface of the rotating shaft 11. That is, the curvature of the arc-shaped surface 625 is consistent with the curvature of the outer peripheral surface of the rotating shaft 11, thereby ensuring that the probe 623 and the outer peripheral surface of the rotating shaft 11 can fit tightly together.

[0037] Since the speed sensor 622 is mounted on the first support unit 61, and the first support unit 61 is mounted on the motor body ring 13, when the shaft 11 rotates, the probe 623 can rotate relative to the speed sensor 622 along with the shaft 11 and the thrust head 12. Each rotation of the shaft 11 triggers a sensing signal at the probe end of the probe 623 and the speed sensor 622, and the speed sensor 622 triggers a pulse signal, thereby measuring the speed of the shaft 11. The probe 623 and the outer circumferential surface of the shaft 11 are in close contact to ensure the stability of the pulse signal acquisition.

[0038] like Figure 2As shown, in some embodiments, the first support unit 61 is mounted on the motor body ring 13 at the non-driving end of the motor 1. The first support unit 61 has a plurality of first through holes 610. The first through holes 610 are spaced apart along the axial direction of the rotating shaft 11, and the first shaft vibration sensor 621 and the speed sensor 622 are installed and fixed through the first through holes 610. Specifically, regarding the installation and fixing method, one embodiment is that after the first shaft vibration sensor 621 (or speed sensor 622) is passed through the first through hole 610, anti-slip serrated washers and nuts are provided on opposite sides of each first through hole 610 along the hole penetration direction. The anti-slip serrated washers and nuts are respectively sleeved on the outer periphery of the first shaft vibration sensor 621 (or speed sensor 622), and the first shaft vibration sensor 621 and speed sensor 622 are pressed into the position of the first through hole 610 by the cooperation of the nuts and anti-slip serrated washers. Alternatively, the fastening assembly used to mount and fix the first shaft vibration sensor 621 (or speed sensor 622) at the first through hole 610 can be other fastening assemblies commonly found in the prior art, which will not be described in detail here.

[0039] The multiple first through holes 610 spaced apart along the axial direction can provide different height positions for the installation of the first sensor unit to accommodate different structural changes of the non-drive end of the motor 1 of the vertical pump, such as adapting to conditions where the monitoring surface has no obvious defects or the installation conditions of the shaft shoulder. For example, if the speed sensor 622 is an eddy current displacement sensor, and the surface of the rotating shaft 11 corresponding to its probe end does not meet the smoothness requirements when the speed sensor 622 is installed at one of the first through holes 610, then the speed sensor 622 can be installed at a first through hole 610 at another height position to ensure that the surface of the rotating shaft 11 corresponding to its probe end meets the smoothness requirements.

[0040] like Figure 2 As shown, in some embodiments, the first support unit 61 includes at least two first supports 611. Each first support 611 is provided with a plurality of first through holes 610. For example Figure 2 In the illustrated embodiment, one of the first brackets 611 has three first through holes 610 spaced apart along the axial direction. A first shaft vibration sensor 621 and a speed sensor 622 are respectively installed in different first through holes 610 on the same first bracket 611. The speed sensor 622 is installed in the top first through hole 610, and the first shaft vibration sensor 621 is installed in the bottom first through hole 610, such that the height of the speed sensor 622 is greater than the height of the first shaft vibration sensor 621. This allows the probe end of the speed sensor 622 to face the outer peripheral surface of the rotating shaft 11, while the probe end of the first shaft vibration sensor 621 can face the outer peripheral surface of the thrust head 12.

[0041] The first bracket 611 is distributed circumferentially along the motor body ring 13. Two first shaft vibration sensors 621 are respectively mounted on two different first brackets 611. By setting two adjacent first brackets 611 to be distributed at an angle of 85 to 95 degrees along the circumference of the rotating shaft 11, the two first shaft vibration sensors 621 are distributed at an angle of 85 to 95 degrees along the circumference of the rotating shaft 11.

[0042] like Figure 2 and Figure 4 As shown, in some embodiments, each first bracket 611 is further provided with a second through hole 612, which is adapted to a plurality of first bolt holes 130 spaced apart along the circumference of the motor body ring 13. Each first bracket 611 is detachably mounted on the motor body ring 13 at a position corresponding to any of the first bolt holes 130 by a first fastener passing through the second through hole 612 and at least one first bolt hole 130. Thus, the first bracket 611 can be mounted using the inherent structure of the vertical pump (the first bolt holes 130 on the motor body ring 13) without modifying the inherent structure of the large vertical pump in the nuclear power plant. Furthermore, the position of each first bracket 611 on the motor body ring 13 is adjustable to accommodate structural changes at the non-drive end of the motor 1 of different vertical pumps. For example, if a slight structural change at the non-drive end of motor 1 causes physical positional interference between the installation position of the first bracket 611 and other components on the vertical pump, the positional interference can be eliminated by changing the position of the first bracket 611 on the motor body ring 13. This helps ensure that two adjacent first brackets 611 can be set to be distributed at an angle of 85 to 95 degrees along the circumference of the shaft 11, thereby helping to ensure that the two first shaft vibration sensors 621 are distributed at an angle of 85 to 95 degrees along the circumference of the shaft 11, thus meeting the requirements for measurement accuracy.

[0043] Specifically, in some embodiments, in addition to being mounted on the motor body ring 13 via the first fastener, the second through hole 612, and the first bolt hole 130 on the motor body ring 13, each first bracket 611 can also be provided with an adhesive layer between the first bracket 611 and the motor body ring 13. The adhesive layer combined with the first bolt hole 130 for fastening increases the contact area between the first bracket 611 and the motor body ring 13 without requiring modification to the vertical pump body structure.

[0044] Furthermore, such as Figure 4As shown, in some embodiments, each first bracket 611 includes a connecting block 6111 and a T-shaped bracket 6112. The T-shaped bracket 6112 is disposed on the connecting block 6111. The connecting block 6111 is used to fix to the motor body ring 13. The T-shaped bracket 6112 is used to install and fasten the first sensor unit. Specifically, the connecting block 6111 is provided with a plurality of second through holes 612. In addition to being installed on the motor body ring 13 through the first fastener, the second through holes 612 and the first bolt holes 130 on the motor body ring 13, the connecting block 6111 can also be provided with an adhesive layer between the connecting block 6111 and the motor body ring 13 to make the connecting block 6111 fit tightly against the motor body ring 13. The T-shaped bracket 6112 includes a vertical plate structure and a flat plate structure. The vertical plate structure is provided with three sizes of first through holes 610 for vertical adjustment within a limited range during the installation of the first sensor unit. The cross-sectional dimensions of the flat plate structure are the same as those of the connecting block 6111. The flat plate structure and the connecting block 6111 are connected together by fasteners such as screws.

[0045] like Figure 1 and Figure 6 As shown, the gearbox 3 and pump body 5 are connected by a coupling 4. The coupling 4 is fitted onto the outer circumference of the pump shaft 2, thereby realizing the transmission connection between the two. Specifically, the coupling housing encloses the coupling 4, and the pump body housing encloses the pump body 5 and the pump shaft 2. A second bolt hole 45 for connecting with other components is reserved on the side of the pump body housing near the coupling housing. Similarly, a second bolt hole 45 for connecting with other components is also reserved on the side of the coupling housing near the pump body housing. A third bolt hole (not shown) for connecting with other components is reserved on the pump body housing near the pump shaft 2.

[0046] In the first embodiment, the second support unit 71 is fitted onto the outer periphery of the coupling housing and is fastened to the second bolt hole 45 on the pump body housing or coupling housing via a second fastener 73. Thus, the second support unit 71 can be installed using the inherent structure of the vertical pump (the second bolt hole 45 on the pump body housing or coupling housing) without requiring modification to the inherent structure of the large vertical pump in the nuclear power plant. In the second embodiment, the second support unit 71 is fitted onto the outer periphery of the pump body housing and is fastened to the third bolt hole on the pump body housing via a second fastener 73.

[0047] like Figure 5As shown, in some embodiments, the second support unit 71 includes a support body 711 and at least two second supports 712. In a first embodiment, the support body 711 is sleeved on the outer periphery of the coupling housing and is fastened to the pump housing or coupling housing by a second fastener 73 and a second bolt hole 45. In a second embodiment, the second support unit 71 is sleeved on the outer periphery of the pump housing and is fastened to the pump housing by a second fastener 73 and a third bolt hole.

[0048] like Figure 5 In the illustrated embodiment, the support body 711 is semi-circular. However, the support body 711 is not limited to being semi-circular; it can also be circular or other shapes. The support body 711 has multiple mounting positions 7110, and each second support 712 is detachably connected to each mounting position 7110. Each mounting position 7110 may include one or two through holes. Each second support 712 can be mounted on each mounting position 7110 by the cooperation of fasteners and through holes. Thus, each second support 712 can be selectively mounted on any mounting position 7110. The second sensor unit includes at least two second shaft vibration sensors 72, which are mounted together in a one-to-one correspondence with the second supports 712. Specifically, the second shaft vibration sensors 72 can be any of the following: eddy current displacement sensors, magnetoelectric displacement sensors, and laser displacement sensors. In the first embodiment, a first through hole is provided on the coupling housing, through which the probe of the second shaft vibration sensor 72 can extend into the interior of the coupling housing. The radial distance between the probe of the second shaft vibration sensor 72 and the coupling 4 is adjusted to approximately 80 mm. In the second embodiment, a second through hole is provided on the pump housing, through which the probe of the second shaft vibration sensor 72 can extend into the interior of the pump housing. The radial distance between the probe of the second shaft vibration sensor 72 and the pump shaft 2 is adjusted to approximately 80 mm. The shaft vibration measurement principle of the second shaft vibration sensor 72 is the same as that of the first shaft vibration sensor 621 described above, and will not be repeated here. In this embodiment, considering the structural characteristics of the coupling housing of the large vertical pump in the nuclear power plant, the second shaft vibration sensor 72 can be a laser displacement sensor.

[0049] Two adjacent second shaft vibration sensors 72 are distributed at an angle of 85° to 95° along the circumference of the coupling housing. Specifically, two adjacent second brackets 712 are mounted on the bracket body 711 at an angle of 85° to 95° along the circumference of the coupling housing or pump housing, thus allowing the two adjacent second shaft vibration sensors 72 to be distributed at an angle of 85° to 95° along the circumference of the coupling housing or pump housing. Since each second bracket 712 can be selected to be installed in any mounting position 7110, that is, the position of each second bracket 712 on the bracket body 711 is adjustable, thereby accommodating changes in the pump body side structure of vertical pumps with different structural forms. For example, if a slight structural change on the pump body side causes physical positional interference between the installation position of the second bracket 712 and other components on the vertical pump, the positional interference can be eliminated by changing the position of the second bracket 712 on the bracket body 711. This helps ensure that two adjacent second brackets 712 can be arranged at an angle of 85 to 95° along the circumference of the coupling housing or pump body housing. This, in turn, helps ensure that two adjacent second shaft vibration sensors 72 are arranged at an angle of 85 to 95° along the circumference of the coupling housing or pump body housing to meet the measurement accuracy requirements.

[0050] Specifically, multiple mounting positions 7110 on the bracket body 711 are distributed at an angle of 22.5° along the circumference of the coupling housing or pump housing. This allows for the selection of two suitable mounting positions 7110 for mounting the second bracket 712, thus avoiding physical positional interference from the existing bolt structure on the pump housing or coupling housing on the installation of the second bracket 712. This facilitates the installation of two adjacent second brackets 712 at an angle of 85 to 95° along the circumference of the coupling housing or pump housing on the bracket body 711.

[0051] like Figure 5 As shown, in some embodiments, each second bracket 712 is provided with a mounting groove 7120. Specifically, in a first embodiment, the length extension direction of the mounting groove 7120 is aligned with the radial direction of the coupling 4; in a second embodiment, the length extension direction of the mounting groove 7120 is aligned with the radial direction of the pump shaft 2. The second shaft vibration sensor 72 is fitted with the mounting groove 7120, and the second shaft vibration sensor 72 can slide along the mounting groove 7120 to change its radial distance with the coupling 4 or its radial distance with the pump shaft 2, so as to meet the measurement distance requirements of the second shaft vibration sensor 72.

[0052] In some embodiments, each second bracket 712 is further provided with an oil guide groove (not shown) at its bottom. This oil guide groove allows oil to drain away, preventing oil from the environment in which the coupling 4 operates from accumulating at the second shaft vibration sensor 72 and affecting its operation. For example, when the second shaft vibration sensor 72 is a laser-type displacement sensor, the oil guide groove is used to prevent oil accumulation in the environment in which the coupling 4 operates from affecting the laser transmission path of the second shaft vibration sensor 72.

[0053] like Figure 1 As shown, in some embodiments, the base unit includes several bases (not shown), which are disposed at at least one of the following locations: bearing position 131 at the non-drive end of the motor of the vertical pump, bearing position 132 at the drive end of the motor, bearing position 31 at the drive end of the gearbox, bearing position 32 at the non-drive end of the gearbox, and bearing position 51 on the pump body side. Specifically, the bearing at the non-drive end of the motor 1 is enclosed by the motor housing; the bearing at the drive end of the motor 1 is enclosed by the motor housing or the gearbox housing; the bearing at the non-drive end of the gearbox 3 is enclosed by the gearbox housing or the motor housing; the bearing at the drive end of the gearbox 3 is enclosed by the gearbox housing or the coupling housing; and the bearing on the pump body side is enclosed by the pump body housing or the coupling housing. Therefore, the bearing position 131 at the non-drive end of the motor refers to the position on the motor housing corresponding to the bearing at the non-drive end of motor 1; the bearing position 132 at the drive end of the motor refers to the position on the motor housing or gearbox housing corresponding to the bearing at the drive end of motor 1; the bearing position 32 at the non-drive end of gearbox 3 refers to the position on the gearbox housing or motor housing corresponding to the bearing at the non-drive end of gearbox 3; the bearing position 31 at the drive end of gearbox 3 refers to the position on the gearbox housing or coupling housing corresponding to the bearing at the drive end of gearbox 3; and the bearing position 51 on the pump body side refers to the position on the pump body housing or coupling housing corresponding to the bearing on the pump body side. The base is installed and fixed to the above-mentioned housing positions by means of adhesive or other methods, and is aligned with the bearings and bearing seats inside the housing.

[0054] The third sensor unit includes several accelerometers (not shown), with each accelerometer and base mounted together in a corresponding manner. Preferably, the base unit includes five bases, which are respectively located at bearing position 131 on the non-drive end of the motor, bearing position 132 on the drive end of the motor, bearing position 31 on the drive end of the gearbox, bearing position 32 on the non-drive end of the gearbox, and bearing position 51 on the pump body side; the third sensor unit includes five accelerometers, with each accelerometer and base mounted together in a corresponding manner. Thus, by using five accelerometers located at five different positions on the vertical pump, the bearing vibration of the vertical pump can be comprehensively monitored. Understandably, the core component inside the accelerometer is a piezoelectric material (such as a quartz crystal or artificially polarized ceramic). When the bearing housing at each of the above bearing positions vibrates, the inertial mass block inside the accelerometer applies periodic pressure to the piezoelectric element due to inertial force, causing the piezoelectric material to deform. This deformation alters the polarization state of the material, generating a charge signal proportional to the vibration acceleration. This signal maps the changes in bearing vibration parameters at each bearing location, enabling the measurement of bearing vibration at each location. The specific structure of the base is not limited; it can refer to the structure of the first bracket 611 or the second bracket 712, as long as it can be used to mount and fix the acceleration sensor.

[0055] In summary, this application has at least the following technical effects:

[0056] 1. By integrating a first sensor unit, a second sensor unit, and a third sensor unit on a vertical pump, shaft vibration parameters, rotational speed parameters, and bearing vibration parameters at different locations are collected respectively, realizing comprehensive monitoring of the vibration state of the long shaft system of a large vertical pump set, providing multi-dimensional vibration data support, and solving the problems of incomplete monitoring and isolated data in the existing technology;

[0057] 2. Utilizing the existing bolt holes and bolts of the large vertical pump unit in the nuclear power plant, the installation of the first bracket 611 and the second bracket 712 is satisfied; the L-shaped probe 623 has an arc-shaped surface 625 facing the rotating shaft 11, ensuring that the probe 623 fits tightly against the surface of the rotating shaft 11, improving the accuracy of pulse signal acquisition; each second bracket 712 is also equipped with an oil guide groove at the bottom to prevent oil accumulation at the coupling 4 during operation from affecting the laser transmission path; the above design ensures high precision and accuracy in the acquisition of shaft vibration signals and speed signals;

[0058] 3. The first through holes 610 spaced along the axial direction on the first bracket 611 support the flexible adjustment of the position of the first sensor unit in the axial direction; each second bracket 712 is provided with a mounting groove 7120 to support the flexible adjustment of the position of the second shaft vibration sensor 72 in the radial direction, so as to adapt to monitoring components with different shaft diameters, and the installation and maintenance are convenient and quick; the first bracket 611 is fixed to the motor body ring 13 by bolts 120 and adhesive layer, which ensures the stability of the installation and minimizes the irreversible impact on the pump group structure.

[0059] 4. By collecting shaft vibration parameters, rotational speed parameters, and bearing vibration parameters at different locations, these data are centrally reported to a monitoring system (such as a computer) via data acquisition devices for integrated calculation. This provides real-time data analysis for technical professionals, enabling timely intervention when data anomalies are detected, and promoting a shift from a reactive maintenance work mode to a predictive maintenance work mode.

[0060] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A vertical pump shaft vibration characteristic monitoring device, characterized in that, This includes the first vibration pickup mechanism, the second vibration pickup mechanism, and the vibration monitoring mechanism; The first vibration pickup mechanism includes a first support unit (61) and a first sensor unit. The first support unit (61) is disposed at the non-driving end of the motor (1) of the vertical pump. The first sensor unit is disposed on the first support unit (61). The first sensor unit is used to collect the shaft vibration parameters and rotational speed parameters of the shaft (11) at the non-driving end of the motor (1). The second vibration pickup mechanism includes a second support unit (71) and a second sensor unit. The second support unit (71) is disposed on the coupling housing between the gearbox (3) and the pump body (5) of the vertical pump. The second sensor unit is disposed on the second support unit (71) and is used to collect the shaft vibration parameters of the coupling (4). Alternatively, the second support unit (71) is disposed on the pump body housing of the vertical pump. The second sensor unit is disposed on the second support unit (71) and is used to collect the shaft vibration parameters of the pump shaft (2). The bearing vibration monitoring mechanism includes a base unit and a third sensor unit. The base unit is located at the bearing position of the vertical pump, and the third sensor unit is located on the base unit. The third sensor unit is used to collect bearing vibration parameters at the bearing position.

2. The vertical pump shaft vibration characteristic monitoring device according to claim 1, characterized in that, The first sensor unit includes a first shaft vibration sensor (621) and a speed sensor (622) disposed on the first support unit (61).

3. The vertical pump shaft vibration characteristic monitoring device according to claim 2, characterized in that, The first sensor unit includes at least two first shaft vibration sensors (621); two adjacent first shaft vibration sensors (621) are distributed at an angle of 85 to 95° along the circumference of the rotating shaft (11).

4. The vertical pump shaft vibration characteristic monitoring device according to claim 2, characterized in that, The speed sensor (622) is an eddy current displacement sensor, and the first sensor unit further includes a probe (623); The probe (623) has a mounting hole (624) that is compatible with a bolt (120) on the thrust head (12) at the non-driving end of the motor (1). The probe (623) is mounted on the thrust head (12) through the cooperation of the mounting hole (624) and the bolt (120). The outer peripheral surfaces of the probe (623) and the rotating shaft (11) are fitted together; The probe (623) can rotate relative to the speed sensor (622) together with the rotating shaft (11) and the thrust head (12).

5. The vertical pump shaft vibration characteristic monitoring device according to claim 2, characterized in that, The first bracket unit (61) is installed on the motor body ring (13) at the non-driving end of the motor (1). The first bracket unit (61) is provided with a plurality of first through holes (610). The first through holes (610) are distributed at intervals along the axial direction of the rotating shaft (11). The first shaft vibration sensor (621) and the speed sensor (622) are installed and fixed through the first through holes (610).

6. The vertical pump shaft vibration characteristic monitoring device according to claim 5, characterized in that, The first support unit (61) includes at least two first supports (611), which are distributed circumferentially along the motor body ring (13), and each first support (611) is provided with a plurality of first through holes (610). Each of the first brackets (611) is also provided with a second through hole (612), which is adapted to a plurality of first bolt holes (130) spaced apart along the circumference of the motor body ring (13). Each of the first brackets (611) is detachably mounted on the motor body ring (13) at the position corresponding to any of the first bolt holes (130) by passing a first fastener through the second through hole (612) and at least one of the first bolt holes (130).

7. The vertical pump shaft vibration characteristic monitoring device according to claim 1, characterized in that, The second bracket unit (71) is sleeved on the outer periphery of the coupling housing and is fastened to the second bolt hole (45) on the pump body housing or coupling housing of the vertical pump by the second fastener (73); Alternatively, the second bracket unit (71) is sleeved on the outer periphery of the pump body housing and is fastened to the pump body housing by the second fastener (73) and the third bolt hole on the pump body housing.

8. The vertical pump shaft vibration characteristic monitoring device according to claim 7, characterized in that, The second support unit (71) includes a support body (711) and at least two second supports (712); The bracket body (711) is sleeved on the outer periphery of the coupling housing and is fastened to the pump body housing or the coupling housing by the second fastener (73) and the second bolt hole (45) on the pump body housing or the coupling housing; or, the bracket body (711) is sleeved on the outer periphery of the pump body housing and is fastened to the pump body housing by the second fastener (73) and the third bolt hole on the pump body housing. The bracket body (711) is provided with a plurality of mounting positions (7110), and each of the second brackets (712) and each of the mounting positions (7110) are detachably connected; The second sensor unit includes at least two second shaft vibration sensors (72), and the second shaft vibration sensors (72) and the second bracket (712) are installed together in a one-to-one correspondence; two adjacent second shaft vibration sensors (72) are distributed at an angle of 85 to 95° along the circumference of the coupling housing or the pump housing.

9. The vertical pump shaft vibration characteristic monitoring device according to claim 8, characterized in that, Each of the second brackets (712) is provided with a mounting groove (7120), the second shaft vibration sensor (72) is installed in cooperation with the mounting groove (7120), and the second shaft vibration sensor (72) can slide along the mounting groove (7120) to change its radial distance with the coupling (4) or with the pump shaft (2); And / or, each of the second brackets (712) is provided with an oil guide groove.

10. The vertical pump shaft vibration characteristic monitoring device according to claim 1, characterized in that, The base unit includes several bases, which are disposed at at least one of the following positions: bearing position (131) at the non-drive end of the motor of the vertical pump, bearing position (132) at the drive end of the motor, bearing position (31) at the drive end of the gearbox, bearing position (32) at the non-drive end of the gearbox, and bearing position (51) on the pump body side. The third sensor unit includes several acceleration sensors, and the acceleration sensors and the base are installed together in a one-to-one correspondence.

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