An evaluation device and method for abrasion damage of a vertical water turbine generator set

Abstract

An abrasion damage assessment device and method for a vertical hydraulic generator set, including a thrust bearing, on which strain gauges for detecting the abrasion degree of the water turbine are installed. In the operating state, the thrust bearing is annularly installed on the base, and the strain gauges are electrically connected to the strain measurement system. The overall weight of the water turbine is measured through the strain gauges and the strain measurement system, and the abrasion damage degree is judged in advance online, so that the maintenance cycle can be reasonably arranged, the availability factor of power equipment can be improved, the maintenance cost can be reduced, and the maintenance risk can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of abrasion damage assessment of vertical hydro-generator units, and particularly to an abrasion damage assessment device and method for vertical hydro-generator units. Background Technique

[0002] Abrasion damage of hydro-generator units is an inevitable phenomenon. For units with abrasion damage, not only the output efficiency is reduced, but also the safe and stable operation of the units is seriously threatened. Repairing units with severe abrasion takes a long time and has a high economic cost. At present, the overhaul of hydro-turbine abrasion damage is still regular overhaul, and it is difficult to judge the degree of abrasion damage during the non-overhaul period. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: to solve the problems existing in the above background technique, and provide an abrasion damage assessment device for vertical hydro-generator units, which weighs the whole hydro-turbine through a strain gauge and a strain measurement system, and judges the degree of abrasion damage in advance online, so as to reasonably arrange the overhaul period, improve the availability factor of power equipment, reduce the maintenance cost, and reduce the maintenance risk.

[0004] Another technical problem to be solved by the present invention is: to provide a method for assessing the abrasion damage of a vertical hydro-generator unit by using the above-mentioned abrasion damage assessment device for vertical hydro-generator units.

[0005] In order to achieve the above technical features, the object of the present invention is realized as follows: An abrasion damage assessment device for a vertical hydro-generator unit includes a thrust bearing, and a strain gauge for detecting the mass of the hydro-turbine is installed on the thrust bearing. In the working state, the strain gauge is electrically connected to a strain measurement system.

[0006] The thrust bearing includes a thrust bearing seat, a connecting pillar, a tray and a thrust bearing bush. One end of the connecting pillar is connected to the thrust bearing seat, and the other end is connected to the tray. The thrust bearing bush is installed above the tray, and the strain gauge is installed between the tray and the thrust bearing bush.

[0007] A limiting groove is provided on the upper side of the tray, and a convex block matching the limiting groove is provided on the lower side of the thrust bearing bush. The thrust bearing bush is slidably installed on the tray through the limiting cooperation of the convex block and the limiting groove, and the strain gauge is installed in the limiting groove of the tray.

[0008] The limiting groove and the convex block are respectively in a cross structure, and the strain gauge is installed in the middle of the cross structure of the limiting groove.

[0009] The thrust bearing includes a thrust bearing seat, connecting struts, a tray, and thrust bearing liners. One end of each connecting strut is connected to the thrust bearing seat, and the other end is connected to the tray. The thrust bearing liners are installed above the tray, and the strain gauges are installed between the thrust bearing seat and the tray.

[0010] The connecting struts consist of upper and lower sections which are connected in a directionally sliding manner. The strain gauges are installed between the upper and lower sections of the connecting struts.

[0011] The thrust bearing includes a thrust bearing seat, connecting struts, a tray, and thrust bearing liners. One end of each connecting strut is connected to the thrust bearing seat, and the other end is connected to the tray. The thrust bearing liners are installed above the tray, and the strain gauges are installed on the thrust bearing liners.

[0012] The thrust bearing liners consist of upper and lower halves which are connected in a directionally sliding manner. The strain gauges are installed between the upper and lower halves of the thrust bearing liners.

[0013] The strain measurement system includes a strain amplifier, a strain measurement host, and a computer. The strain gauges are electrically connected to the strain amplifier, the strain amplifier is electrically connected to the strain measurement host, and the strain measurement host is electrically or wirelessly connected to the computer.

[0014] A method for evaluating the abrasion damage of a vertical water turbine generator set using the described vertical water turbine generator set abrasion damage evaluation device includes the following steps:

[0015] S1. Install the thrust bearing with strain gauges in place.

[0016] S2. Lead out the wire harnesses of the strain gauges through the sealing cover above the thrust bearing oil tank.

[0017] S3. Electrically connect the wiring of each strain gauge to the strain amplifier one by one, then connect the strain amplifier to the strain measurement host, and connect the strain measurement host to the computer electrically or wirelessly. The computer monitors the change in the weight data of each strain gauge in real time.

[0018] S4. During the test operation of the water turbine, when the strain gauges are subjected to the gravity of the water turbine, they deform. After deformation, the resistance value of the strain gauges changes. The strain amplifier converts the resistance change into an electrical signal, which is then analyzed by the strain measurement host and the corresponding weight value is displayed on the computer.

[0019] S5. Calculate the initial mass W1 of the water turbine by cumulative calculation based on the weight values of each strain gauge displayed on the computer.

[0020] S6. The water turbine operates normally. During the operation of the water turbine, the computer displays the real-time mass W2 of the current water turbine in real time and calculates the wear value K according to the formula.

[0021] K = △W / D 2

[0022] In the formula, △W is the difference between the initial mass W1 and the real-time mass W2 of the water turbine, and D is the diameter of the runner of the water turbine.

[0023] S7. The calculated K value is brought into the standards of the International Electrotechnical Commission, and the degree of erosion damage is obtained by comparison. Among them, the IEC lower limit is 0.47 and the IEC upper limit is 1.9. When the K value is greater than 0.47, it is evaluated that the erosion of the water turbine begins to occur. The greater the K value, the more serious the erosion damage. It can be appropriately processed according to the maintenance cycle. When the K value is greater than 1.9, it is evaluated that the erosion damage has affected the normal operation of the water turbine, and maintenance should be arranged immediately.

[0024] The present invention has the following beneficial effects:

[0025] 1. By installing strain gauges on the thrust bearing for detecting the erosion degree of the water turbine, in the use state, the thrust bearing is annularly installed on the base, and the strain gauges are electrically connected to the strain measurement system. The overall water turbine is weighed through the strain gauges and the strain measurement system, and the degree of erosion damage is judged in advance online, so that the maintenance cycle can be reasonably arranged, the availability factor of power equipment can be improved, the maintenance cost can be reduced, and the maintenance risk can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional structural schematic diagram of the present invention in the use state.

[0027] Figure 2 It is an expanded structural schematic diagram of the thrust bearing of the present invention.

[0028] Figure 3 It is a structural schematic diagram of the evaluation system of the present invention.

[0029] In the figure: machine base 10, thrust bearing 20, thrust bearing seat 21, connecting strut 22, tray 23, limiting groove 231, thrust bearing shoe 24, convex block 241, strain gauge 30, strain measurement system 40, strain amplifier 41, strain measurement host 42, computer 43. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following further describes the embodiments of the present invention with reference to the drawings.

[0031] Embodiment 1:

[0032] See Figures 1-3, a vertical water turbine generator abrasion damage assessment device, including a thrust bearing 20, on which a strain gauge 30 for detecting the quality of the water turbine is installed. In the operating state, the thrust bearing 20 is annularly installed on the base 10, and the strain gauge 30 is electrically connected to the strain measurement system 40. The overall weight of the water turbine is measured through the strain gauge 30 and the strain measurement system 40, and the degree of abrasion damage is judged in advance online, so as to reasonably arrange the maintenance cycle, improve the availability factor of power equipment, reduce the maintenance cost, and reduce the maintenance risk.

[0033] The strain measurement system 40 includes a strain amplifier 41, a strain measurement host 42 and a computer 43. The strain gauge 30 is electrically connected to the strain amplifier 41, the strain amplifier 41 is electrically connected to the strain measurement host 42, and the strain measurement host 42 is electrically or wirelessly connected to the computer 43. Among them, the strain amplifier 41 adopts an SGA host of model HSV1M4, the strain measurement host 42 adopts model EL-110, and the strain gauge 30 adopts a resistive strain gauge, which is waterproof and oil-proof and has reliable performance.

[0034] See Figure 2 , the thrust bearing 20 includes a thrust bearing seat 21, a connecting pillar 22, a tray 23 and a thrust bearing bush 24. One end of the connecting pillar 22 is connected to the thrust bearing seat 21, and the other end is connected to the tray 23. The thrust bearing bush 24 is installed above the tray 23, and the strain gauge 30 is installed between the tray 23 and the thrust bearing bush 24. The tray 23 and the thrust bearing bush 24 do not rotate with the unit, and the strain gauge 30 is placed on the tray 23 and will not wear with the rotating part.

[0035] Specifically, a limiting groove 231 is provided on the upper side of the tray 23, and a convex block 241 cooperating with the limiting groove 231 is provided on the lower side of the thrust bearing bush 24. The thrust bearing bush 24 is slidably installed on the tray 23 through the limiting cooperation of the convex block 241 and the limiting groove 231, and the strain gauge 30 is installed in the limiting groove 231 of the tray 23. A sliding directional cooperation structure is formed through the cooperation of the limiting groove 231 and the convex block 241. Preferably, the depth of the limiting groove 231 is less than the height of the convex block 241.

[0036] Furthermore, the limiting groove 231 and the convex block 241 are respectively in a cross structure, and the strain gauge 30 is installed in the middle of the cross structure of the limiting groove 231. The cross guiding structure has good stability.

[0037] Embodiment 2:

[0038] The difference from the first embodiment is that the thrust bearing 20 includes a thrust bearing seat 21, a connecting pillar 22, a tray 23, and a thrust bearing bush 24. One end of the connecting pillar 22 is connected to the thrust bearing seat 21, and the other end is connected to the tray 23. The thrust bearing bush 24 is installed above the tray 23, and the strain gauge 30 is installed between the thrust bearing seat 21 and the tray 23.

[0039] Specifically, the connecting pillar 22 is composed of upper and lower sections. The upper and lower sections of the connecting pillar 22 are connected in a directionally sliding manner, and the strain gauge 30 is installed between the upper and lower sections of the connecting pillar 22.

[0040] Regarding the directional connection of the upper and lower sections of the connecting pillar 22 for up and down sliding, the cross-guide structure in the first embodiment can be adopted, or a polygonal groove can be provided in the lower section and a polygonal boss can be provided in the upper section. The sliding limit directional fit is formed by the boss and the polygonal groove. Of course, the strain gauge 30 is placed at the bottom of the polygonal groove, and the depth of the polygonal groove is less than the length of the polygonal boss.

[0041] Embodiment Three:

[0042] The difference from the first and second embodiments is that the thrust bearing 20 includes a thrust bearing seat 21, a connecting pillar 22, a tray 23, and a thrust bearing bush 24. One end of the connecting pillar 22 is connected to the thrust bearing seat 21, and the other end is connected to the tray 23. The thrust bearing bush 24 is installed above the tray 23, and the strain gauge 30 is installed on the thrust bearing bush 24.

[0043] Specifically, the thrust bearing bush 24 is composed of upper and lower halves. The upper and lower halves of the thrust bearing bush 24 are connected in a directionally sliding manner, and the strain gauge 30 is installed between the upper and lower halves of the thrust bearing bush 24. The directional connection of the upper and lower halves of the thrust bearing bush 24 for up and down sliding can adopt the structures in the first and second embodiments.

[0044] Embodiment Four:

[0045] A method for evaluating the abrasion damage of a vertical water turbine generator set by using the vertical water turbine generator set abrasion damage evaluation device described above includes the following steps.

[0046] S1. Install the thrust bearing 20 equipped with the strain gauge 30 in place.

[0047] S2. Lead out the wire harnesses of the strain gauges 30 through the sealing cover above the thrust bearing oil tank.

[0048] S3. Connect the wiring of each strain gauge 30 to the strain amplifier 41 one by one. The strain amplifier 41 is then connected to the strain measurement host 42, and the strain measurement host 42 is electrically or wirelessly connected to the computer 43. The computer 43 monitors the change in the weight data of each strain gauge 30 in real time;

[0049] S4. Conduct a test run of the water turbine. When the strain gauge 30 is subjected to the gravity of the water turbine, it deforms. After the strain gauge 30 deforms, its resistance value changes. The strain amplifier 41 converts the resistance change into an electrical signal, and then it is analyzed by the strain measurement host 42, and the corresponding weight value is displayed on the computer 43;

[0050] S5. Calculate the initial mass W1 of the water turbine by cumulatively adding the weight values of each strain gauge 30 displayed on the computer 43;

[0051] S6. During the normal operation of the water turbine, during the operation of the water turbine, the computer 43 displays the current real-time mass W2 of the water turbine in real time, and calculates the wear value K according to the formula,

[0052] K = △W / D 2

[0053] In the formula, △W is the difference between the initial mass W1 and the real-time mass W2 of the water turbine, and D is the diameter of the runner of the water turbine.

[0054] S7. Substitute the calculated K value into the IEC standard of the International Electrotechnical Commission to obtain the degree of erosion damage by comparison. Among them, the IEC lower limit is 0.47 and the IEC upper limit is 1.9. When the K value is greater than 0.47, it is evaluated that the erosion of the water turbine has started. The greater the K value, the more serious the erosion damage, and it can be appropriately processed according to the maintenance cycle. When the K value is greater than 1.9, it is evaluated that the erosion damage has affected the normal operation of the water turbine, and maintenance should be arranged immediately.

Claims

1. An abrasion damage assessment device for a vertical water turbine generator set, including a thrust bearing (20), characterized in that: A strain gauge (30) for detecting the quality of the water turbine is installed on the thrust bearing (20). In the use state, the strain gauge (30) is electrically connected to a strain measurement system (40). The strain measurement system (40) includes a strain amplifier (41), a strain measurement host (42), and a computer (43). The strain gauge (30) is electrically connected to the strain amplifier (41), the strain amplifier (41) is electrically connected to the strain measurement host (42), and the strain measurement host (42) is electrically or wirelessly connected to the computer (43).

2. The abrasion damage assessment device for a vertical water turbine generator set according to claim 1, characterized in that: The thrust bearing (20) includes a thrust bearing seat (21), connecting struts (22), a tray (23), and a thrust bearing bush (24). One end of the connecting strut (22) is connected to the thrust bearing seat (21), and the other end is connected to the tray (23). The thrust bearing bush (24) is installed above the tray (23), and the strain gauge (30) is installed between the tray (23) and the thrust bearing bush (24).

3. The abrasion damage assessment device for a vertical water turbine generator set according to claim 2, characterized in that: A limiting groove (231) is provided on the upper side of the tray (23), and a convex block (241) cooperating with the limiting groove (231) is provided on the lower side of the thrust bearing bush (24). The thrust bearing bush (24) is slidably installed on the tray (23) through the limiting cooperation of the convex block (241) and the limiting groove (231), and the strain gauge (30) is installed in the limiting groove (231) of the tray (23).

4. An abrasion and erosion damage assessment device for a vertical water turbine generator set according to claim 3, characterized in that: The limiting groove (231) and the convex block (241) are respectively in a cross structure, and the strain gauge (30) is installed in the middle of the cross structure of the limiting groove (231).

5. The abrasion damage assessment device for a vertical water turbine generator set according to claim 1, characterized in that: The thrust bearing (20) includes a thrust bearing seat (21), connecting struts (22), a tray (23), and a thrust bearing bush (24). One end of the connecting strut (22) is connected to the thrust bearing seat (21), and the other end is connected to the tray (23). The thrust bearing bush (24) is installed above the tray (23), and the strain gauge (30) is installed between the thrust bearing seat (21) and the tray (23).

6. The abrasion failure evaluation device for a vertical water turbine generator set according to claim 5, characterized in that: The connecting strut (22) is composed of upper and lower sections, and the upper section and the lower section of the connecting strut (22) are directionally connected in a vertical sliding manner. The strain gauge (30) is installed between the upper and lower sections of the connecting strut (22).

7. An evaluation device for abrasion damage of a vertical water turbine generator set according to claim 1, characterized in that: The thrust bearing (20) includes a thrust bearing seat (21), connecting struts (22), a tray (23), and a thrust bearing bush (24). One end of the connecting strut (22) is connected to the thrust bearing seat (21), and the other end is connected to the tray (23). The thrust bearing bush (24) is installed above the tray (23), and the strain gauge (30) is installed on the thrust bearing bush (24).

8. An abrasion damage assessment device for a vertical water turbine generator set according to claim 7, characterized in that: The thrust bearing bush (24) is composed of upper and lower halves, and the upper half and the lower half of the thrust bearing bush (24) are directionally connected in a vertical sliding manner. The strain gauge (30) is installed between the upper and lower halves of the thrust bearing bush (24).

9. A method for evaluating the abrasion damage of a vertical water turbine generator set by using the abrasion damage evaluation device for a vertical water turbine generator set according to any one of claims 1-8, characterized in that, It includes the following steps S1. Install the thrust bearing (20) equipped with the strain gauge (30) in place; S2. Lead out the wire harnesses of the strain gauges (30) through the sealing cover above the thrust bearing oil tank; S3. Connect the wiring of each strain gauge (30) to the strain amplifier (41) one by one. The strain amplifier (41) is then electrically connected to the strain measurement host (42), and the strain measurement host (42) is electrically or wirelessly connected to the computer (43). The computer (43) monitors the change of the weight data of each strain gauge (30) in real time; S4. Conduct a test run of the water turbine. When the strain gauge (30) is subjected to the gravity of the water turbine, it deforms. After the strain gauge (30) deforms, its resistance value changes. The strain amplifier (41) converts the resistance change into an electrical signal, which is then analyzed by the strain measurement host (42), and the corresponding weight value is displayed on the computer (43); S5. Calculate the initial mass W1 of the water turbine by accumulating the weight values of each strain gauge (30) displayed by the computer (43); S6. The water turbine operates normally. During the operation of the water turbine, the computer (43) displays the real-time mass W2 of the current water turbine in real time and calculates the wear value K according to the formula; K= ；（1） In the formula, is the difference between the initial mass W1 and the real-time mass W2 of the water turbine, and D is the diameter of the runner of the water turbine; S7. Substitute the calculated K value into the International Electrotechnical Commission (IEC) standard to obtain the degree of erosion damage by comparison. Among them, the IEC lower limit is 0.47 and the IEC upper limit is 1.

9. When the K value is greater than 0.47, it is evaluated that the erosion of the water turbine has started. The greater the K value, the more serious the erosion damage, and appropriate treatment can be carried out according to the maintenance cycle. When the K value is greater than 1.9, it is evaluated that the erosion damage has affected the normal operation of the water turbine, and maintenance should be arranged immediately.

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