Simple diagnosis method and tool for vibration of centrifugal pump and fan

Abstract

The invention belongs to the technical field of vibration measurement, and particularly relates to a simple diagnosis method and tool for vibration of a centrifugal pump and a fan, and the tool comprises a clamping plate, one side of the clamping plate is provided with a first side plate, and the upper end of the first side plate is provided with a first sensor; the two sides of the first side plate are respectively provided with a second side plate in an extending manner, the tail end of each second side plate is vertically provided with a third side plate, and each third side plate is provided with a second sensor; the bearing box comprises an upper box body and a lower box body, a first arc-shaped block is arranged on the upper side of the middle of the upper box body, and second arc-shaped blocks are symmetrically arranged on the two sides of the upper box body; the clamping plate is cooperatively arranged on the surface of the second arc-shaped block, the first mounting block clings to the surface of the first arc-shaped block, and the third side plate clings to the side walls of the upper box body and the lower box body. The tool is designed according to the special structure of the bearing box, the problem that an installation face is not flat is solved, the problem that the number of installation point positions is large, and installation is difficult due to inconsistent installation point positions is solved, and the tool is convenient to disassemble and assemble and suitable for long-term online monitoring.

Description

Technical Field

[0001] The present invention belongs to the technical field of vibration measurement, and particularly relates to a simple diagnosis method and tooling for the vibration of centrifugal pumps and fans. Background Art

[0002] With the development of modern industry, pumps and fans are widely used in industrial fields such as fire protection, electric power, petrochemical, metallurgy, mining, pharmaceuticals, building materials, transportation energy, etc. and civil projects. Vibration is one of the common main faults during the operation of pumps and fans. In severe cases, vibration accidents will occur, which will not only cause production interruptions, equipment accidents, and significant property losses, but also cause casualties.

[0003] As Figure 1 shown, the structure of a fan generally includes a motor 1, a coupling 11, a speed reducer 2, a fixed bearing box 3, a fan shaft 44, a volute 4, an air inlet 42, an impeller 41, an air outlet 43, etc. After being powered on, the motor 1 rotates, adjusts the speed through the speed reducer 2, drives the impeller 41 of the fan shaft 44 to rotate through the coupling 11, the fixed bearing box 3 supports the fan shaft 44 and the impeller 41, gas enters the volute 4 from the air inlet 42, the pressure of the gas increases after passing through the rotating impeller 41, and is discharged from the air outlet 43. Generally, vibration probes are designed to be installed on the surface of the bearing box in the horizontal and vertical directions (see Figure 2 ) with a total of 4 measuring points, and are remotely transmitted to the DCS computer in the control room for real-time online monitoring.

[0004] In the prior art, during online detection, since the surface of the bearing box is basically a curved surface, the probe (sensor) is generally fixed by opening threaded holes in the bearing box and fixing the probe (sensor) with stainless steel bolts; or using a magnetic base to adsorb on the surface of the housing, and the sensor is screwed onto the base. Opening holes in key parts such as the bearing seat and housing may cause weakening of strength or stress concentration; using magnetic fixation, the magnetic force decays with the increase in temperature, and the high-frequency signal decays severely, and it is easy to fall off due to high temperature, dust, and vibration during long-term operation. Summary of the Invention

[0005] Aiming at the technical problems existing in the background art, the present invention provides a simple diagnosis method and tooling for the vibration of centrifugal pumps and fans.

[0006] To achieve the above object, the technical solution provided by the present invention is as follows:

[0007] A vibration diagnosis tooling for centrifugal pumps and fans, comprising a clamping assembly arranged on the surface of a bearing housing. The clamping assembly includes a clamping plate, on one side of which there is a first side plate. At the upper end of the first side plate, there is a first mounting block, and a first sensor is arranged on the first mounting block. On both sides of the first side plate, there are respectively extended second side plates. At the end of the second side plate, there is a third side plate vertically arranged, and a second sensor is arranged on the third side plate. The bearing housing includes a detachable upper housing and a lower housing. On the upper side of the middle of the upper housing, there is a first arc-shaped block, and on both sides of the upper housing, there are symmetrically arranged second arc-shaped blocks. On both sides of the lower housing, there are symmetrically arranged third arc-shaped blocks. The clamping plate is arranged in cooperation with the surface of the second arc-shaped block. The first side plate is closely attached to the side wall of the first arc-shaped block, the first mounting block is closely attached to the surface of the first arc-shaped block, the second side plates are closely attached to the side walls of the upper housing and the lower housing, and the third side plate is closely attached to the side walls of the upper housing and the lower housing.

[0008] Optionally, on both sides of the second arc-shaped block, there are respectively arranged L-shaped first connecting blocks, and on both sides of the third arc-shaped block, there are respectively arranged L-shaped second connecting blocks. The first connecting block and the second connecting block are attached to each other and connected by a first bolt. At the bottom ends of both sides of the clamping plate, there are symmetrically arranged U-shaped sliders. The sliders are provided with a first mounting groove penetrating up and down, and on both sides of the first side plate, there are respectively arranged second mounting grooves, which are communicated with the first mounting groove. The first connecting block and the second connecting block are arranged on the inner wall of the slider, and the first bolt passes through both ends of the first mounting groove.

[0009] Optionally, a first nut is arranged in cooperation with the first bolt, and the first nut is closely attached to the upper end of the first connecting block. On the first bolt, there is a first pressing assembly, which includes a first cylinder body and a second nut. On one side of the first cylinder body, there is a first pressing block. The inner wall of the first cylinder body is provided with a first polygonal inner hole, and the first nut is closely attached to the first polygonal inner hole. The second nut is threadedly connected to the first bolt and is used to press the first cylinder body so that the first pressing block is closely attached to the slider.

[0010] Optionally, on both sides of the upper housing and the lower housing, they are vertically connected by a plurality of second bolts, and a third nut is arranged in cooperation with the second bolts. The upper ends of the second side plate and the third side plate are connected by an L-shaped top plate, and the top plate is closely attached to the upper end surface of the upper housing.

[0011] Optionally, a second pressing assembly is provided on the second bolt. The second pressing assembly includes a second cylinder body and a fourth nut. A ring-shaped second pressing block is provided on the bottom side of the second cylinder body. A second polygonal inner hole is provided on the inner wall of the second cylinder body. The third nut is closely arranged against the second polygonal inner hole. The fourth nut is threadedly connected to the second bolt and is used to press the second cylinder body so that the second pressing block is closely arranged against the top plate.

[0012] Optionally, cooling pipes are respectively connected to both sides of the upper box body and the lower box body. One end of the cooling pipe is provided with a mounting flange. A number of third bolts are provided on the mounting flange, and a fifth nut is cooperatively arranged on the third bolts. Two limiting grooves are provided on one side of the third side plate, and the outer wall of the mounting flange is closely arranged against the inner wall of the limiting grooves.

[0013] Optionally, a third pressing assembly is provided on the third bolt. The third pressing assembly includes a third cylinder body and a sixth nut. A third pressing block is provided on the bottom side of the third cylinder body. A third polygonal inner hole is provided on the inner wall of the third cylinder body. The fifth nut is closely arranged against the third polygonal inner hole. The inner wall of the third pressing block is closely arranged against the outer wall of the mounting flange. The sixth nut is threadedly connected to the third bolt and is used to press the third cylinder body so that the third pressing block is closely arranged against the third side plate.

[0014] Optionally, the clamping plate, the first side plate and the first mounting block are connected by a number of first rib plates. The clamping plate, the first side plate and the second side plate are connected by a number of second rib plates. The second rib plates are arranged on both sides of the first rib plates. The first rib plates and the second rib plates are evenly distributed along the circumference of the clamping plate. The slider, the second side plate and the third side plate are connected by a third rib plate.

[0015] Optionally, the second side plate and the third side plate are connected by a fourth rib plate. One end of the fourth rib plate is opposite to the limiting groove. A clamping groove is provided on the fourth rib plate. The clamping groove is arranged close to the limiting groove. An avoidance groove is provided in the middle of the third pressing block. The inner wall of the upper end of the avoidance groove has stepped table surfaces with different heights. The fourth rib plate is arranged in the avoidance groove, and the stepped table surfaces are cooperatively clamped with the clamping groove.

[0016] A vibration diagnosis method for a centrifugal pump and a fan includes the following steps:

[0017] S1. Obtain the vibration sample fault table of the pump and the fan: Statistically form a sample fault table by the vibration phenomena, characteristics and causes of the actual pump and fan.

[0018] S2. Vibration fault diagnosis: Take the sample fault table as a sample for comparison. By detecting the vibration frequency and comparing it with the sample fault frequency, the vibration cause is analyzed.

[0019] The present invention has the following advantages and beneficial effects:

[0020] In the present invention, for the special structure of the bearing box with a curved surface or special-shaped housing, a tooling and a threaded connection are designed to stably install the tooling on the surface of the bearing box, solving the problem of uneven installation surfaces and the installation difficulties caused by a large number of installation positions and inconsistent installation points.

[0021] In the present invention, the curved surface of the bearing box is fitted and positioned for installation by using the clamping plate. The sensor is installed vertically through the first mounting block on the upper side of the clamping plate, and the sensor is installed horizontally through the third side plates on both sides of the clamping plate, realizing multi-point measurement installation in multiple directions and at multiple points. This kind of tooling structure is suitable for clamping the curved surface bearing box, is convenient for disassembly and assembly, and is suitable for long-term on-line monitoring. Description of the Drawings

[0022] Figure 1 is the structural diagram of the centrifugal pump and fan in the prior art;

[0023] Figure 2 is the distribution diagram of the vibration measurement points on the centrifugal pump and fan in the prior art

[0024] Figure 3 is the structural diagram of the bearing box in the present invention;

[0025] Figure 4 is one of the structural diagrams of the vibration diagnosis tooling and the bearing box in the present invention;

[0026] Figure 5 is the other structural diagram of the vibration diagnosis tooling and the bearing box in the present invention;

[0027] Figure 6 is the front view of the vibration diagnosis tooling and the bearing box in the present invention;

[0028] Figure 7 is Figure 6 the top view of;

[0029] Figure 8 is Figure 5 the partial enlarged view of the first positioning block, the second positioning block and the slider in;

[0030] Figure 9 is Figure 5 the partial enlarged view of the cooling pipe, the second side plate, the third side plate and the bearing box in;

[0031] Figure 10 is one of the structural diagrams of the vibration diagnosis tooling in the present invention;

[0032] Figure 11 is the other structural diagram of the vibration diagnosis tooling in the present invention;

[0033] Figure 12 The Figure 10 partial enlarged view at position a in

[0034] Figure 13 is Figure 10 front view of

[0035] Figure 14 is Figure 11 top view of

[0036] Figure 15 is Figure 13 left view

[0037] Figure 16 is the half-sectional view of the second cylinder in the present invention;

[0038] Figure 17 is the sectional view of the first cylinder in the present invention;

[0039] Figure 18 is one of the structural diagrams of the third cylinder in the present invention;

[0040] Figure 19 is another structural diagram of the third cylinder in the present invention;

[0041] Figure 20 is the sectional view of the third cylinder in the present invention.

[0042] Reference numerals: 1 - motor, 11 - coupling, 2 - reduction gearbox, 3 - bearing housing, 31 - upper housing, 311 - second arc-shaped block, 312 - first connecting block, 313 - first arc-shaped block, 314 - lifting lug, 32 - lower housing, 321 - third arc-shaped block, 322 - second connecting block, 33 - base, 34 - second bolt, 341 - third nut, 35 - first bolt, 351 - first nut, 36 - cooling pipe, 361 - mounting flange, 37 - third bolt, 371 - fifth nut, 38 - end flange, 39 - end bolt, 4 - volute, 41 - impeller, 42 - air inlet, 43 - air outlet, 44 - fan shaft, 5 - clamping assembly, 51 - clamping plate, 511 - first rib plate, 512 - second rib plate, 52 - first side plate, 53 - first mounting block, 531 - first mounting cylinder, 54 - second side plate, 541 - top plate, 542 - third rib plate, 55 - third side plate, 551 - second mounting block, 552 - limiting groove, 553 - second mounting cylinder, 56 - slider, 561 - first mounting groove, 562 - second mounting groove, 563 - fifth rib plate, 57 - fourth rib plate, 571 - clamping groove, 6 - second cylinder, 61 - second through hole, 62 - second polygon inner hole, 63 - second pressing block, 64 - fourth nut, 7 - first cylinder, 71 - first through hole, 72 - first polygon inner hole, 73 - first pressing block, 74 - second nut, 8 - third pressing assembly, 81 - third cylinder, 811 - third through hole, 812 - third polygon inner hole, 82 - top ring, 83 - third pressing block, 831 - avoiding groove, 84 - sixth nut, 9 - first sensor, 91 - second sensor. Detailed implementation mode

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0045] Embodiment 1

[0046] As Figures 3 to 15 shown, a vibration diagnosis tooling for a centrifugal pump and a fan includes a clamping assembly 5, a first sensor 9, a second sensor 91, etc. provided on the surface of the bearing housing 3.

[0047] As Figures 3 to 15As shown, the clamping assembly 5 includes a clamping plate 51. On one side of the clamping plate 51, there is a first side plate 52. At the upper end of the first side plate 52, there is a first mounting block 53. On the first mounting block 53, there is a first mounting cylinder 531. A first sensor 9 is threadedly connected inside the first mounting cylinder 531. On both sides of the first side plate 52, there are second side plates 54 extending respectively. At the end of the second side plate 54, a third side plate 55 is vertically arranged. On one side of the third side plate 55, there is a second mounting block 551. On the second mounting block 551, there is a second mounting cylinder 553. A second sensor 91 is threadedly connected inside the second mounting cylinder 553.

[0048] As Figures 3 to 15 shown, the bearing housing 3 includes a detachable upper housing 31 and a lower housing 32. The upper housing 31 and the lower housing 32 are arranged in a square shape. At the bottom side of the lower housing 32, there is a base 33 integrally arranged. At the upper side of the middle of the upper housing 31, there is a first arc-shaped block 313. In the middle of the first arc-shaped block 313, there is a lifting lug 314. The first mounting block 53 is arranged in an arc shape and has the same curvature as the first arc-shaped block 313. The bottom side of the first mounting block 53 is attached to the surface of the first arc-shaped block 313.

[0049] As Figures 3 to 15 shown, on both sides of the upper housing 31, there are second arc-shaped blocks 311 symmetrically arranged. On both sides of the lower housing 32, there are third arc-shaped blocks 321 symmetrically arranged. The second arc-shaped blocks 311 and the third arc-shaped blocks 321 are attached to form an annular cylindrical shape. The clamping plate 51 is arranged to cooperate with the surface of the second arc-shaped block 311. The clamping plate 51 is arranged in an arc shape and has the same curvature as the second arc-shaped block 311. The first side plate 52 is closely attached to the side wall of the first arc-shaped block 313. The first mounting block 53 is closely attached to the surface of the first arc-shaped block 313. The second side plates 54 are closely attached to the side walls of the upper housing 31 and the lower housing 32. The third side plate 55 is closely attached to the other side walls of the upper housing 31 and the lower housing 32. In this way, the tooling can be positioned and clamped on the surface of the bearing housing 3. Through the clamping plate 51, the first side plate 52, the second side plates 54, the third side plate 55, and the first mounting block 53, the bearing housing 3 can be wrapped, positioned, and installed from all around, ensuring that the tooling can be stably installed and fixed.

[0050] As Figures 3 to 15 shown, inside the upper housing 31 and the lower housing 32, there is a fan shaft 44 rotatably arranged. The ends of the second arc-shaped blocks 311 and the third arc-shaped blocks 321 are fixed through an end flange 38 and end bolts 39.

[0051] In the present invention, aiming at the special structure of the bearing housing 3, which has a curved surface or a special-shaped shell, a tooling and a threaded connection are designed to stably install the tooling on the surface of the bearing housing 3, solving the problem of uneven installation surface and the problem of difficult installation caused by multiple installation positions and inconsistent installation points.

[0052] In the present invention, the clamping plate 51 is used to fit the bearing box 3 with the curved surface for positioning and installation, the first sensor 9 is installed in the vertical direction through the first installation block 53 on the upper side of the clamping plate 51, and the second sensor 91 is installed in the horizontal direction through the second installation blocks 551 on both sides of the clamping plate 51, so as to realize multi-point installation in multiple directions and multiple positions. This kind of tooling structure is adapted to clamp the curved surface bearing box 3, is convenient for disassembly and assembly, and is suitable for long-term online monitoring.

[0053] Example 2

[0054] like Figures 3 to 15 , Figure 17 As shown, L-shaped first connecting blocks 312 are respectively provided on both sides of the second arc block 311, and L-shaped second connecting blocks 322 are respectively provided on both sides of the third arc block 321. The first connecting block 312 is attached to the second connecting block 322 and connected by a first bolt 35. The connection of the first bolt 35 is a connection structure of the bearing box 3, which is used to realize the connection between the second arc block 311 and the third arc block 321.

[0055] like Figures 3 to 15 , Figure 17 As shown, U-shaped sliders 56 are symmetrically arranged at the bottom ends of both sides of the clamping plate 51, and the sliders 56 are provided with first mounting grooves 561 running through the top and bottom. Second mounting grooves 562 are respectively arranged on both sides of the first side plate 52, and the second mounting grooves 562 are connected to the first mounting grooves 561; the first connecting block 312 and the second connecting block 322 are arranged on the inner wall of the slider 56, and the first bolt 35 passes through the two ends of the first mounting groove 561. The slider 56 is used to realize the positioning installation of the clamping plate 51, and the existence of the first mounting groove 561 and the second mounting groove 562 can avoid the first bolt 35, so as to avoid collision and interference between the first bolt 35 and the slider 56. This structure further realizes the positioning installation of the clamping plate 51, and will not be interfered by the first bolt 35 when the tooling is installed later.

[0056] Furthermore, the first bolt 35 is provided with a first nut 351, and the first nut 351 is arranged close to the upper end surface of the first connecting block 312. The first bolt 35 is provided with a first clamping assembly, and the first clamping assembly includes a first cylinder 7 and a second nut 74. A first clamping block 73 is arranged on one side of the first cylinder 7. The inner wall of the first cylinder 7 is provided with a first through hole 71 and a first polygonal inner hole 72. The first nut 351 is arranged close to the first polygonal inner hole 72. The second nut 74 is threadedly connected to the first bolt 35, and is used to clamp the first cylinder 7 so that the first clamping block 73 is arranged close to the slider 56. With such a structure, the slider 56 is clamped and fixed by the first bolt 35 in cooperation with the first clamping assembly. At the same time, the first cylinder 7 and the first nut 351 cooperate. After the first nut 351 is locked, the first cylinder 7 can be prevented from rotating, and the locking effect of the second nut 74 can be strengthened.

[0057] Example 3

[0058] As Figures 3 to 16 shown, both sides of the upper box body 31 and the lower box body 32 are vertically connected by a plurality of second bolts 34, and a third nut 341 is arranged in cooperation with the second bolts 34. The upper ends of the second side plate 54 and the third side plate 55 are connected by an L-shaped top plate 541, and the top plate 541 is arranged closely against the upper end surface of the upper box body 31, realizing the precise positioning and installation of the second side plate 54, the third side plate 55 and the bearing box 3.

[0059] As Figures 3 to 16 shown, a second pressing assembly is arranged on the second bolt 34. The second pressing assembly includes a second cylinder body 6 and a fourth nut 64. An annular second pressing block 63 is arranged on the bottom side of the second cylinder body 6. A second through hole 61 and a second polygonal inner hole 62 are arranged on the inner wall of the second cylinder body 6. The third nut 341 is arranged closely against the second polygonal inner hole 62. The fourth nut 64 is threadedly connected to the second bolt 34 and is used for pressing the second cylinder body 6 so that the second pressing block 63 is closely against the top plate 541. With such a design, by using the second bolt 34 and cooperating with the second pressing assembly, the top plate 541 is pressed and fixed. At the same time, when the second cylinder body 6 and the third nut 341 cooperate and the third nut 341 is locked, the rotation of the second cylinder body 6 can be prevented, strengthening the locking effect of the fourth nut 64.

[0060] Example 4

[0061] As Figures 3 to 15 、 Figures 18 to 20 shown, cooling pipes 36 are respectively connected to both sides of the upper box body 31 and the lower box body 32. One end of the cooling pipe 36 is provided with a mounting flange 361. A plurality of third bolts 37 are arranged on the mounting flange 361, and a fifth nut 371 is arranged in cooperation with the third bolts 37 to realize the installation of the cooling pipe 36 on the upper box body 31 and the lower box body 32, and provide a cooling medium for the inside of the bearing box 3. Two limiting grooves 552 are formed on one side of the third side plate 55, and the outer wall of the mounting flange 361 is attached to the inner wall of the limiting grooves 552, so that the limiting installation of the third side plate 55 can be realized.

[0062] As Figures 3 to 15 、 Figures 18 to 20As shown in the figure, a third pressing assembly 8 is provided on the third bolt 37. The third pressing assembly 8 includes a third cylinder body 81 and a sixth nut 84. A third pressing block 83 is provided on the bottom side of the third cylinder body 81. A third through hole 811 and a third polygonal inner hole 812 are provided on the inner wall of the third cylinder body 81. The fifth nut 371 is closely arranged against the third polygonal inner hole 812. The inner wall of the third pressing block 83 is closely attached to the outer wall of the mounting flange 361. The sixth nut 84 is threadedly connected to the third bolt 37 and is used to press the third cylinder body 81 so that the third pressing block 83 is closely arranged against the third side plate 55. With such a design, by using the third bolt 37 and cooperating with the third pressing assembly 8, the third side plate 55 is pressed and fixed. At the same time, when the third cylinder body 81 and the fifth nut 371 cooperate and the fifth nut 371 is locked, the rotation of the third cylinder body 81 can be prevented, strengthening the locking effect of the sixth nut 84.

[0063] Embodiment 5

[0064] As Figures 3 to 15 shown in the figure, the clamping plate 51, the first side plate 52 and the first mounting block 53 are connected by a plurality of first rib plates 511. The first rib plates 511 are formed by vertically splicing two triangular rib plates. The inner walls of the first rib plates 511 are respectively closely attached to the clamping plate 51, the first side plate 52 and the first mounting block 53. The clamping plate 51, the first side plate 52 and the second side plate 54 are connected by a plurality of second rib plates 512. The second rib plates 512 are arranged in a triangular shape and are arranged on both sides of the first rib plates 511. The first rib plates 511 and the second rib plates 512 are evenly distributed along the circumference of the clamping plate 51. The slider 56, the second side plate 54 and the third side plate 55 are connected by a third rib plate 542. The third rib plate 542 is formed by vertically splicing two triangular rib plates. The inner walls of the third rib plate 542 are respectively closely attached to the slider 56, the second side plate 54 and the third side plate 55. Through the connection of the rib plates, the overall tooling has sufficient strength.

[0065] Furthermore, the second side plate 54 and the third side plate 55 are connected by a fourth rib plate 57. The fourth rib plate 57 is formed by vertically splicing two triangular rib plates. The inner walls of the fourth rib plate 57 are respectively closely attached to the second side plate 54 and the third side plate 55. One end of the fourth rib plate 57 is directly opposite to the limiting groove 552. A clamping groove 571 is provided on the fourth rib plate 57 and is arranged close to the limiting groove 552. An avoidance groove 831 is provided in the middle of the third pressing block 83. The upper inner wall of the avoidance groove 831 has stepped surfaces A and B with different heights. The fourth rib plate 57 is arranged in the avoidance groove 831. The stepped surfaces A and B are engaged with the clamping groove 571, and the stepped surface A is engaged into the clamping groove 571. With such a structure, while strengthening the strength of the overall structure by using the fourth rib plate 57, the positioning and installation of the overall tooling are realized by the engagement of the third pressing block 83 and the clamping groove 571, which can prevent the tooling from loosening and withdrawing and ensure the overall stability.

[0066] Furthermore, the bottom side of the slider 56 and the second side plate 54 are connected by a fifth rib plate 563 to enhance the connection strength between the slider 56 and the second side plate 54.

[0067] The core principle of fixture design is stiffness first: the natural frequency of the fixture needs to be greater than 10 times the highest measured frequency (for example, if the fan speed is 1 kHz, then the natural frequency of the fixture > 10 kHz), and then lightweight: avoid additional mass from changing the vibration characteristics of the structure. This type of fixture structure can ensure the stiffness of the fixture and increase the natural frequency of the fixture through multiple rib plate structures; the total mass of the fixture is less than 1 / 10 of the mass of the measured structure. When necessary, fixture simulation verification is required, and ANSYS or SolidWorks Simulation is used to check whether the fixture resonates within the fan operating frequency band (such as 0 - 5 kHz).

[0068] Embodiment 6

[0069] A vibration diagnosis method for centrifugal pumps and fans includes the following steps:

[0070] S1. Obtain the vibration sample fault table of the pump and the fan: Statistically form the sample fault table by the vibration phenomena, characteristics, and causes of the actual pump and fan.

[0071] S2. Vibration fault diagnosis: Use the sample fault table as a sample for comparison, detect the vibration frequency, compare it with the sample fault frequency, and thus analyze the vibration cause.

[0072] The vibration sample fault table refers to the process in which researchers compare the vibration phenomena and characteristics of the actual pump and fan with those of the sample faults. They adopt the reverse reasoning thinking mode in deductive reasoning. This thinking method of comparing with the fault source as a sample is the vibration fault diagnosis. By detecting (or calculating) the vibration frequency, comparing it with the sample fault frequency, analyzing the vibration cause, and taking corresponding countermeasures.

[0073] Vibration sample fault table of the pump and the fan:

[0074]

[0075]

[0076] Handheld vibration frequency measurement or calculation. Using a VBT35 vibration meter or a similar one, it can accurately measure the 5 highest spectral peaks, and measure the vibration frequency and its amplitude. If a VI CTOR 63A or RI ovI bro vm-63a vibration meter is used, when the vibration at one point is close to 4.6 mm / s, calculate its operating frequency f = np / 60, where n is the actual motor speed (rpm) and p is the number of motor pole pairs. For 2 poles, there is 1 pair. The number of motor poles reflects the synchronous speed of the motor. The synchronous speed for 2 poles is 3000 r / min, for 4 poles is 1500 r / min, for 6 poles is 1000 r / min, and for 8 poles is 750 r / min.

[0077] Online axial vibration detection. Using the tooling of the present invention, conduct online axial vibration detection at the bearing box position, and compare it with the handheld detection value. The difference between the two should be less than 10%. Then, find the vibration source according to the pump and fan vibration sample fault table and formulate an equipment maintenance plan.

[0078] This diagnostic method can eliminate the deficiencies caused by empirical judgment, improve the efficiency of handling pump and fan vibration faults, prevent or reduce the damage to pumps and fans caused by axial vibration, and reduce labor costs and maintenance expenses.

[0079] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A vibration diagnosis tooling for centrifugal pumps and fans, characterized in that: It includes a clamping assembly arranged on the surface of the bearing housing. The clamping assembly includes a clamping plate. On one side of the clamping plate, there is a first side plate. At the upper end of the first side plate, there is a first mounting block, and a first sensor is arranged on the first mounting block. On both sides of the first side plate, second side plates extend respectively. At the ends of the second side plates, third side plates are vertically arranged, and a second sensor is arranged on the third side plates. The bearing housing includes a detachable upper housing and a lower housing. On the upper side of the middle of the upper housing, there is a first arc-shaped block. On both sides of the upper housing, second arc-shaped blocks are symmetrically arranged. On both sides of the lower housing, third arc-shaped blocks are symmetrically arranged. The clamping plate is arranged to cooperate with the surface of the second arc-shaped block. The first side plate is closely attached to the side wall of the first arc-shaped block. The first mounting block is closely attached to the surface of the first arc-shaped block. The second side plates are closely attached to the side walls of the upper housing and the lower housing. The third side plates are closely attached to the side walls of the upper housing and the lower housing.

2. The vibration diagnosis tooling for centrifugal pumps and fans according to claim 1, wherein: On both sides of the second arc-shaped block, L-shaped first connecting blocks are respectively arranged. On both sides of the third arc-shaped block, L-shaped second connecting blocks are respectively arranged. The first connecting blocks and the second connecting blocks are attached to each other and connected by first bolts. At the bottom ends of both sides of the clamping plate, U-shaped sliders are symmetrically arranged. The sliders are vertically penetrated with first mounting grooves. On both sides of the first side plate, second mounting grooves are respectively arranged. The second mounting grooves are communicated with the first mounting grooves. The first connecting blocks and the second connecting blocks are arranged on the inner walls of the sliders, and the first bolts pass through both ends of the first mounting grooves.

3. The centrifugal pump and fan vibration diagnosis tooling according to claim 2, wherein: A first nut is arranged to cooperate with the first bolt. The first nut is closely attached to the upper end of the first connecting block. A first pressing assembly is arranged on the first bolt. The first pressing assembly includes a first cylinder body and a second nut. On one side of the first cylinder body, there is a first pressing block. The inner wall of the first cylinder body is provided with a first polygonal inner hole. The first nut is closely attached to the first polygonal inner hole. The second nut is threadedly connected to the first bolt and is used to press the first cylinder body so that the first pressing block is closely attached to the slider.

4. The vibration diagnosis tooling for centrifugal pumps and fans according to claim 1, characterized in that: On both sides of the upper housing and the lower housing, they are vertically connected by a number of second bolts. A third nut is arranged to cooperate with the second bolts. The upper ends of the second side plates and the third side plates are connected by an L-shaped top plate. The top plate is closely attached to the upper end surface of the upper housing.

5. The centrifugal pump and fan vibration diagnosis tooling according to claim 4, characterized in that: A second pressing assembly is arranged on the second bolt. The second pressing assembly includes a second cylinder body and a fourth nut. On the bottom side of the second cylinder body, there is an annular second pressing block. The inner wall of the second cylinder body is provided with a second polygonal inner hole. The third nut is closely attached to the second polygonal inner hole. The fourth nut is threadedly connected to the second bolt and is used to press the second cylinder body so that the second pressing block is closely attached to the top plate.

6. The centrifugal pump and fan vibration diagnosis tooling according to claim 1, wherein: Cooling pipes are respectively connected to both sides of the upper housing and the lower housing. At one end of the cooling pipe, there is a mounting flange. A number of third bolts are arranged on the mounting flange. A fifth nut is arranged to cooperate with the third bolts. On one side of the third side plate, two limiting grooves are opened. The outer wall of the mounting flange is attached to the inner wall of the limiting grooves.

7. The centrifugal pump and fan vibration diagnosis tooling according to claim 6, wherein: A third pressing assembly is provided on the third bolt. The third pressing assembly includes a third cylinder body and a sixth nut. A third pressing block is provided on the bottom side of the third cylinder body. A third polygonal inner hole is provided on the inner wall of the third cylinder body. The fifth nut is arranged closely against the third polygonal inner hole. The inner wall of the third pressing block is closely against the outer wall of the mounting flange. The sixth nut is threadedly connected to the third bolt and is used to press the third cylinder body so that the third pressing block is closely against the third side plate.

8. The vibration diagnosis tooling for centrifugal pumps and fans according to claim 2, wherein: The clamping plate, the first side plate and the first mounting block are connected by a plurality of first rib plates. The clamping plate, the first side plate and the second side plate are connected by a plurality of second rib plates. The second rib plates are arranged on both sides of the first rib plates. The first rib plates and the second rib plates are evenly distributed along the circumference of the clamping plate. The slider, the second side plate and the third side plate are connected by a third rib plate.

9. The centrifugal pump and fan vibration diagnosis tooling according to claim 7, wherein: The second side plate and the third side plate are connected by a fourth rib plate. One end of the fourth rib plate is aligned with the limiting groove. A clamping groove is provided on the fourth rib plate. The clamping groove is arranged close to the limiting groove. An avoidance groove is provided in the middle of the third pressing block. The inner wall of the upper end of the avoidance groove has stepped surfaces with different heights. The fourth rib plate is arranged in the avoidance groove. The stepped surfaces are engaged with the clamping groove.

10. A vibration diagnosis method for a vibration diagnosis tooling of a centrifugal pump and a fan according to claim 1, comprising the following steps: S1. Obtain a vibration sample fault table of the pump and the fan: statistically form a sample fault table by the vibration phenomena, characteristics and causes of the actual pump and the fan. S2. Vibration fault diagnosis: Take the sample fault table as a sample for comparison. By detecting the vibration frequency and comparing it with the sample fault frequency, the vibration cause is analyzed.

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