CN115753096A

CN115753096A - Nuclear power station main pump thrust bearing test bed and assembling method thereof

Info

Publication number: CN115753096A
Application number: CN202211385168.XA
Authority: CN
Inventors: 安宁; 胡军; 滕建刚; 徐熙; 王乃明; 赵长城; 赵新一; 任光辉; 冯光宇; 代鸿凌; 廖晖; 冯帅; 陶邵佳; 韩志忠
Original assignee: SHENYANG BLOWER WORKS GROUP NUCLEAR POWER PUMP CO Ltd; Jiangsu Nuclear Power Corp
Current assignee: SHENYANG BLOWER WORKS GROUP NUCLEAR POWER PUMP CO Ltd; Jiangsu Nuclear Power Corp
Priority date: 2022-11-07
Filing date: 2022-11-07
Publication date: 2023-03-07

Abstract

The application belongs to the technical field of station rotating equipment maintenance engineering, and particularly relates to a nuclear power station main pump thrust bearing test bed and an assembling method thereof. This nuclear power station main pump thrust bearing test bench includes: the device comprises a base, a loader, a lower torque meter, a motor supporting seat, a radial thrust bearing, an upper torque meter, a motor bracket and a motor; the loader is fixed on the base, the upper end of the loader is fixed with the lower end of the lower torque meter, and the loader is provided with a first positioning pin; the upper end of the lower torque meter passes through the first through hole to be fixed with the lower end of the radial thrust bearing, and is provided with a second positioning pin; go up the torquemeter lower extreme and radial thrust bearing's upper end fixed to be provided with the third locating pin, go up the upper end of torquemeter and pass the second through-hole and pass through the shaft coupling and be connected with the motor, and be provided with the fourth locating pin, solved the problem of multistage axle combination rotor assembly and centering difficulty among the prior art, guarantee assembly quality.

Description

Nuclear power station main pump thrust bearing test bed and assembling method thereof

Technical Field

The application belongs to the technical field of maintenance engineering of rotating equipment of a nuclear power station, and particularly relates to a test bed for a thrust bearing of a main pump of the nuclear power station and an assembling method of the test bed.

Background

The thrust bearing of a main pump of a nuclear power station unit is a water-lubricated non-dynamic pressure bearing, the bearing bush is made of siliconized graphite, bears an axial force of about 440KN during normal operation, and belongs to a million kilowatt-level nuclear main pump high-thrust water-lubricated bearing. In the thrust bearing development process, an important link is to carry out bench test, simulate the real running state of the thrust bearing in the main pump through a test bench, carry out a series of performance tests such as normal working condition, over-design working condition and service life running-in on the bearing material, the reliability of the bearing material provides a basis for the main pump bearing to complete the nationwide production.

However, the test bed is generally in a structural form of a multi-section shaft coupling rotor, the assembly process is complex and high in requirement, and the fit dimension between each part is difficult to adjust. In addition, in the test process, the test bed needs to be disassembled and assembled for many times for the running states of the bearing bush at different time stages. Therefore, the assembly of the present bearing test stand is extremely challenging.

Disclosure of Invention

The application aims to provide a test bed for a main pump thrust bearing of a nuclear power station and an assembling method thereof, which solve the problem that a multi-section shaft combined rotor is difficult to assemble and center in the prior art and ensure the assembling quality.

The technical scheme for realizing the purpose of the application is as follows:

the embodiment of the application provides a nuclear power station main pump thrust bearing test bench, includes: the device comprises a base (1), a loader (9), a lower torque meter (12), a motor supporting seat (3), a radial thrust bearing (16), an upper torque meter (23), a motor bracket (6) and a motor (7);

shells are arranged among the base (1), the motor supporting seat (3) and the motor bracket (6); the loader (9), the lower torque meter (12), the radial thrust bearing (16) and an upper torque meter (23) are arranged in the shell;

the loader (9) is fixed on the base (1), the upper end of the loader is fixed with the lower end of the lower torquemeter (12), and a first positioning pin (15) is arranged on the loader;

the motor supporting seat (3) is fixed with the radial thrust bearing (16), and the middle of the motor supporting seat is provided with a first through hole; the upper end of the lower torque meter (12) penetrates through the first through hole to be fixed with the lower end of the radial thrust bearing (16), and a second positioning pin (134) is arranged; a test pad block is fixed at the contact position of the stator of the radial thrust bearing (16) and the bearing rotor (135);

a second through hole is formed in the motor support (6), and the motor (7) is fixed on the motor support; the lower end of the upper torquemeter (23) is fixed with the upper end of the radial thrust bearing (16), a third positioning pin (128) is arranged, the upper end of the upper torquemeter (23) penetrates through the second through hole and is connected with the motor (7) through a coupler, and a fourth positioning pin (129) is arranged.

Optionally, a rotor centering device (125) is fixed at the upper end of the radial thrust bearing (16) and used for preventing the relative position of the bearing rotor (135) and the stator from changing in the integral hoisting process of the radial thrust bearing (16).

Optionally, the bearing rotor (135) is fixed to a pump shaft (62), and the pump shaft (62) is fixed to the lower end of the upper torque meter (23); the rotor centering device (125) comprising: a fixed disc (131) and four adjusting rods (132);

the fixed disc (131) is of an annular structure, the bottom surface of the fixed disc is fixed with the upper end of the radial thrust bearing (16), and the middle opening of the fixed disc is larger than the diameter of the pump shaft (62); the four adjusting rods (132) are perpendicular to each other, one end of each adjusting rod is fixed on the fixed disc (131), and the other end of each adjusting rod is used for locking the position of the pump shaft (62).

Optionally, the radial thrust bearing (16) further comprises: a bearing thrust disc (56), an upper panel (68) and a lower panel (55);

the upper breadth plate (68) and the lower breadth panel (55) are respectively fixed on the upper side and the lower side of the bearing thrust disc (56);

the upper side of the upper breadth plate (68) is provided with an upper test tile block (103) and an upper separation strip (107) which are oppositely arranged; the lower side of the lower panel (55) is provided with a lower test tile block (111) and a lower separation strip (115) which are oppositely arranged;

the upper side of the upper plate (68) and the lower side of the lower plate (55) are in contact with the stator of the radial thrust bearing (16).

Optionally, the radial thrust bearing (16) further comprises: a lower thrust plate (54), an upper thrust plate (67) and a bearing housing shell 18;

the lower thrust disc (54) is fixed in the bearing chamber shell (18), and the tile surface of the lower panel (55) is in contact with the tile surface of the lower thrust disc (54);

the upper push-up disc (67) is fixed in the bearing chamber shell (18), and the tile surface of the upper push-up disc (67) is in contact with the tile surface of the upper breadth plate (68).

Optionally, the lower thrust disk (54) or the upper thrust disk (67) includes: the balance weight comprises an upper balance weight (116), a tile disc base (117), a balance weight base (118), a lower balance weight (119), a thrust tile block (121), a thrust tile base (122) and a thrust tile pressing plate (124);

the lower balance weight (119) is mounted on the balance weight base (118), and the upper balance weight (116) is mounted on the lower balance weight (119);

the thrust shoe base (122) and the thrust shoe block (121) form a thrust shoe unit and are arranged at corresponding positions of the upper balance block (116); the thrust shoe pressing plates (124) are installed on two sides of the thrust shoe base (122).

Optionally, the loader (9) includes: a loader rotor (136) and a loader housing (51);

the lower coupling a (11) of the lower torque meter (12) is connected with the coupling A (42) of the loader rotor (136);

the loader rotor (136) is mounted within the loader housing (51);

an upper tile (38) and a lower tile (36) are installed in the loader shell (51), and the lower end face of a loader thrust disc (37) on the loader rotor (136) is attached to the surface of the lower tile (36).

The embodiment of the application also provides an assembling method of the test bed for the thrust bearing of the main pump of the nuclear power station, which is applied to any one of the test beds for the thrust bearing of the main pump of the nuclear power station provided by the embodiment; the method comprises the following steps:

step 1: -assembling the web of the radial thrust bearing (16);

step 2: a bearing rotor (135) to which the radial thrust bearing (16) is fitted;

and step 3: -assembling a loader rotor (136) of the loader (9);

and 4, step 4: a rotor sub-assembly connecting the loader rotor (136), the bearing rotor (135), the lower torque meter (12) and the upper torque meter (23);

and 5: -assembling the loader (9);

step 6: a thrust shoe plate to which the radial thrust bearing (16) is fitted;

and 7: a bearing chamber in which the radial thrust bearing (16) is fitted;

and 8: assembling an upper shaft seal top cover unit;

and step 9: and (6) integrally assembling the test bed.

Optionally, the step 1 specifically includes:

step 1.1: assembling an upper breadth plate (68); step 1.1, specifically comprising:

step 1.1.1: the upper separation bars (107) are sequentially installed back in corresponding pin holes in the upper panel disc body (106);

step 1.1.2: installing the tile blocks (103) of the upper panel back on the tray body (106) of the upper panel, and recording the serial numbers of the tile blocks;

step 1.1.3: the large rubber ring (102) of the upper breadth plate and the small rubber ring (104) of the upper breadth plate are installed back;

step 1.1.4; an upper breadth plate outer pressure ring (101) and an upper breadth plate inner pressure ring (105) are installed back;

step 1.1.5: lifting the whole breadth plate to 200mm height, respectively installing two bolts V (97) and a bolt W (98) on opposite angles and locking;

step 1.1.6: and turning the breadth plate to make the back face upward, sequentially installing the rest bolts V (97) and W (98) back, and fastening by adopting a cross method.

Step 1.2: assembling a lower panel (55); step 1.2, specifically comprising:

step 1.2.1: installing the lower separation strip (115) back into the corresponding pin hole in the lower breadth plate disc body (108) according to the mark;

step 1.2.2: the lower breadth plate tile block (111) is installed back on the lower breadth plate disc body (108), and the tile block number is recorded;

step 1.2.3: a lower breadth panel large rubber ring (110) and an upper breadth panel small rubber ring (112) are installed back;

step 1.2.4: the outer pressing ring (109) and the inner pressing ring (113) of the lower breadth panel are installed back;

step 1.2.5: the bolt Y (114) is reinstalled and fastened by the crisscross method.

Optionally, the step 2 specifically includes:

step 2.1: a bearing thrust disc (56) is supported on the maintenance square box in the positive direction, and a level gauge is used for leveling;

step 2.2: the radial bearing inner sleeve (91) is installed on the bearing thrust disc (56) again and is fastened by using a bolt T (90);

step 2.3: mounting the upper panel (68) to the bearing thrust disc (56) and fastening by using a bolt P (69);

step 2.4: sequentially reinstalling a sealing ring F (96), a mechanical seal ring B (95) and a mechanical seal ring B (93), and fastening by using a mechanical seal screw B (92);

step 2.5: turning over the bearing thrust disc (56) by using a crane, enabling the back surface of the bearing thrust disc (56) to be upwards supported on the maintenance square box, and leveling by using a level gauge;

step 2.6: the lower panel (55) is installed back on the bearing thrust disc (56) and is fastened by using a bolt S (89);

step 2.7: the sealing ring E (88) is installed again, the threaded pump rotor (87) is installed on the bearing thrust disc (56) again and is fastened by using a bolt R (86);

step 2.8: sequentially reinstalling a sealing ring D (85), a mechanical seal ring A (84) and a mechanical seal ring A (83), and fastening by using a mechanical seal screw A (82);

step 2.9: erecting the pump shaft (62) by using a crane;

step 2.10: turning over the thrust disc (56) of the bearing with a crane to enable the front face to face upwards, slowly loading the erected pump shaft (62) into the thrust disc (56) Kong Zhongla to lean against, and fastening by using a nut G (94);

step 2.11: and sequentially mounting the stud B (78), the shaft coupling B (75) and the shaft head flange (76) to the pump shaft (62) and fastening by using a nut (77).

Optionally, step 3 specifically includes:

step 3.1: respectively reinstalling an inner ring of a rolling bearing A (30) and an inner ring of a rolling bearing B (47) to corresponding positions on a loader shaft (44);

step 3.2: placing the loader thrust disc (37) on a special maintenance rack, installing a loader shaft (44) into a central hole of the loader thrust disc (37), and fastening by using a nut E (52);

step 3.3: the coupling a (42) is mounted to the loader shaft (44) and tightened using the nut D (43).

Optionally, step 4 specifically includes:

step 4.1: connecting a lower coupler a (11) of a lower torquemeter (12) with a coupler A (42) of a loader rotor (136) and fastening by using a bolt D (10);

and 4.2: connecting a coupling B (75) of a radial thrust bearing rotor (135) with an upper coupling B (13) of a lower torque meter (12) and fastening by using a bolt E (14);

step 4.3: the shaft coupling C (21) is installed on the pump shaft (62) in a reinstalling mode, the lower end face of the upper torque meter (23) is connected with the shaft coupling C (21), and the shaft coupling C (21) is fastened through bolts a (22);

step 4.4: connecting a coupler E (28) with the upper end face of an upper torque meter (23), and fastening by using a bolt H (25) and a nut B (24);

step 4.5: the assembled rotor is hung on a surface-beating platform to be horizontally placed, and the positions of two supporting points are positioned at the positions of the radial bearing and the inner ring of a rolling bearing on a loader shaft;

step 4.6: measuring deflection and runout of a rotor, wherein the standard is required to be within 0.05 mm;

step 4.7: if the measured parameters exceed the standard, correcting the exceeding parts in a manual adjustment or machining mode until all parameters of the small rotor assembly are qualified;

step 4.8: positioning pins, namely a positioning pin A (15), a positioning pin G (137), a positioning pin E (128) and a positioning pin F (129), are arranged and configured at the positions where the couplings are connected, so that the mounting positions of the matched components are guaranteed to be unchanged during each assembling;

step 4.9: horizontally placing the rotor on a dynamic balancing machine, fixing stator parts of an upper torque meter and a lower torque meter, adopting G1.0-grade quality dynamic balance for the bearing rotor, and removing weights on a bearing thrust disc (56) and a loader thrust disc (37);

step 4.10: disassembling the rotor, disassembling a bolt D (10), a bolt E (14) and a bolt a (22), and disassembling a coupling A (42) and a coupling a (11), a coupling B (75) and a coupling B (13) which are connected, and a coupling C (21) and an upper torque meter (23);

step 4.11: placing the decomposed radial bearing rotor part and the torque meter rotor part on corresponding racks;

step 4.12: disassembling a screw cap (77), and sequentially disassembling the shaft head flange (76) and the coupling B (75) from the pump shaft (62);

step 4.13: a nut D (43) is removed, and a coupling A (42) is removed from a loader shaft (44).

Optionally, step 5 specifically includes:

step 5.1: the outer ring of the rolling bearing A (30) is installed on the bearing seat (32) in a returning mode, and the bearing cover A (31) is installed on the bearing seat (32) in a returning mode and fixed;

step 5.2: turning the loader shell (51) to the back side upwards, and reinstalling the bearing seat (32) onto the shell (51) and fixing the bearing seat by using a bolt J (33);

step 5.3: turning the loader shell (51) to the front side upwards, reinstalling the lower bush seat (35) into the loader shell (51), fastening by using a bolt N (50), and reinstalling until the loader shell is aligned with the oil inlet;

step 5.4: the sealing ring A (34) and the sealing ring B (49) are installed back into the lower tile seat (35), and the lower tile (36) is installed back into the lower tile seat (35);

step 5.5: the loader rotor (136) without the coupling A (42) is installed back into the loader shell (51), so that the lower end surface of the loader thrust disc (37) is attached to the surface of the lower tile (36);

step 5.6: placing the loader upper cover (41) horizontally upwards, reinstalling the outer ring of the rolling bearing B (47) to the corresponding position of the loader upper cover (41), reinstalling the bearing cover B (45), and fastening by using a bolt L (46);

step 5.7: turning over the loader upper cover (41) to the back side upwards, reinstalling the upper tile seat (40) to the corresponding position of the loader upper cover (41), and fastening by using a bolt K (39);

step 5.8: the sealing ring A (34) and the sealing ring B (49) are installed back into the upper tile seat (40), and the upper tile (38) is installed back into the upper tile seat (40);

step 5.9: turning over the loader upper cover (41) provided with the upper tile to the front side upwards, and mounting the loader upper cover back into the loader shell (51) and fastening the loader upper cover by using a bolt M (48);

step 5.10: the coupling a (42) is reinstalled onto the loader shaft (44) and tightened using the nut D (43).

Optionally, step 6 specifically includes:

step 6.1: the thrust shoe pressing plate (124) on one side of the thrust shoe base (122) is installed back and fastened by using a screw C (120);

step 6.2: the thrust shoe block (121) and the rubber rope (123) are installed on the thrust shoe base (122) in a reinstalling mode, the thrust shoe pressure plate (124) on the other side is installed in a reinstalling mode, and the bolt C (120) is used for fastening;

step 6.3: the balance block base (118) is installed back to the corresponding position in the tile tray base (117), and the clamping is prevented during installation;

step 6.4: mounting the lower counterbalance (119) back to the counterbalance base (118) as marked;

step 6.5: the upper balance block (116) is installed on the lower balance block (119) again according to the mark, and the upper balance block is lightly taken when the upper balance block is installed again;

step 6.6: the thrust shoe unit consisting of the thrust shoe base (122) and the thrust shoe block (121) is installed back to the corresponding position of the upper balance block (116) according to the mark;

step 6.7: the thrust disk pressing ring (127) is mounted back on the tile disk base (117) and is fastened by using a bolt Z (127).

Optionally, step 7 specifically includes:

step 7.1: placing the bearing chamber shell (18) on an overhauling square box, and leveling by using a level gauge;

step 7.2: the shaft sleeve (73) is installed back into the bearing chamber shell (18) and is fastened by a screw B (74);

step 7.3: the sealing ring C (79) and the lower machine seal stator unit (72) are sequentially installed back into the bearing chamber shell (18) and fastened by using a bolt Q (71);

step 7.4: the screw pump stator (80) is installed back into the bearing chamber shell (18) and is fastened by a bolt R (81);

step 7.5: the spring compensation pad (53) is installed back into the bearing chamber shell (18) with the care that the compensation pad positioning hole is aligned with the positioning pin D (70);

step 7.6: reinstalling a lower thrust disc (54) into the bearing housing shell (18);

step 7.7: mounting the radial thrust bearing rotor without the coupling back into the bearing housing (18) so that the tile surface of the lower breadth plate (55) is contacted with the tile surface of the lower thrust disc (54);

step 7.8: turning over the upper push disc (67) until the tile surface is placed downwards, reinstalling the adjusting backing plate (66), and fastening by using a screw A (59);

step 7.9: the upper thrust disc (67) is installed back into the bearing chamber shell (18) so that the tile surface of the upper thrust disc (67) is in contact with the tile surface of the upper breadth plate (68);

step 7.10: the bearing upper cover (63) is installed back into the bearing chamber shell (18), a positioning pin C (58) on the bearing upper cover (63) is aligned with a positioning hole of the upper thrust disc (67) when in installation, and a stud A (65) and a nut F (64) are used for fastening;

step 7.11: the radial bearing (61) is installed on the upper bearing cover (63) in a reinstalling mode and is fastened through a bolt O (60);

step 7.12: a radial thrust bearing centering device (125) is used for adjusting the circumferential gap of the radial bearing to be uniform, and after the adjustment is finished, an adjusting rod (132) is tightly pushed to fix the relative position of the bearing chamber rotor and the stator;

step 7.13: and sequentially mounting the stud C (78), the shaft coupling B (75) and the shaft head flange (76) to the pump shaft (62) and fastening by using a nut (77).

Optionally, step 8 specifically includes:

step 8.1: placing the back of the shaft seal top cover (20) upwards;

step 8.2: the upper sealing stator unit (100) is mounted on the shaft sealing top cover (20) in a reinstalling mode and is fastened through a bolt X (99);

step (ii) of 8.3: and turning the upper shaft sealing top cover unit (137) to the front side and placing the upper shaft sealing top cover unit upwards to wait for reloading.

Optionally, step 9 specifically includes:

step 9.1: placing the base (1) on a test site, and leveling by using a level gauge;

step 9.2: the loader (9) is installed back into the base (1) and is fastened by a bolt C (8);

step 9.3: reassembling the lower torque meter (12), connecting a coupler a (11) with a coupler A (42), installing a positioning pin A (15), and fastening by using a bolt D (10);

step 9.4: the motor supporting seat (3) is installed on the base (1) in a resetting mode, the position of the motor supporting seat (3) is adjusted, and the lower torque meter coupler b (13) is located in the center of an inner hole of the motor supporting seat (3);

step 9.5, leveling the motor supporting seat (3) by using a level gauge, and fastening by using a bolt A (2);

step 9.6: a radial thrust bearing (16) is installed in a motor support seat (3) again, a coupler B (75) is connected with a coupler B (13), a positioning pin A (15) is installed, a bolt E (14) is used for fastening, and a bolt F (17) is installed again and fastened;

step 9.7: when the bolt E (14) and the bolt F (17) are installed back, interference or stress cannot exist, and if the interference or stress exists, the position of the motor supporting seat (3) is adjusted;

step 9.8: disassembling the radial thrust bearing centering device (125), and re-measuring the uniform clearance around the radial bearing;

step 9.9: the upper shaft sealing top cover unit (137) is mounted on the bearing upper cover (63) in a reinstalling mode and is fastened through a bolt G (19);

step 9.10: the shaft coupling C (21) is mounted on the pump shaft (62) in a reinstalling mode;

step 9.11: the upper torquemeter (23) is reinstalled, the lower end face of the upper torquemeter is connected with a coupler C (21), and the lower end face of the upper torquemeter is fastened by using a bolt a (22);

step 9.12: connecting a motor bracket (6) with a motor (7) and fastening by using a bolt b (130);

step 9.13: integrally mounting the connected motor bracket (6) and the motor (7) on the motor support seat (3) again, and mounting the bolt B (5) again;

step 9.14: centering work of a coupler E (28) and a coupler E (29) is carried out, and centering data are adjusted through the matching position of the motor support (6) and the motor support seat (3);

step 9.15: after centering, the bolt B (5) is fastened, and the bolt I (26) and the nut C (27) are reinstalled and fastened.

The beneficial technical effect of this application lies in:

1) According to the test bench and the assembling method for the thrust bearing of the main pump of the nuclear power station, the assembling work of the test bench can be effectively guided, the assembling of the test bench is completed, and the domestic bench test of the main pump bearing bush is ensured to be smoothly carried out;

2) According to the test bed for the thrust bearing of the main pump of the nuclear power station and the assembling method thereof, a standard assembling process is solidified, the assembling method is modularized, the workload of repeated assembly is reduced, and the working efficiency is improved;

3) According to the test bed for the thrust bearing of the main pump of the nuclear power station and the assembling method thereof, after the first assembling is completed, the small assembling work of a rotor is not needed in the subsequent assembling and disassembling process, the later assembling workload is reduced, and the working time is saved;

4) According to the test bench and the assembling method for the thrust bearing of the main pump of the nuclear power station, the positioning pins are additionally arranged at the connection and matching positions of the segmented rotors of the modules, so that the relative positions of the rotor parts are kept unchanged after each re-assembly, and the assembling working quality is improved;

5) According to the nuclear power station main pump thrust bearing test bed and the assembling method thereof, the bearing rotor centering device is designed and manufactured, the rotor is fixed in the center of the stator when the bearing chamber is integrally reassembled, the phenomenon that the center of the rotor is repeatedly adjusted after the bearing chamber is integrally reassembled is avoided, the assembling process is optimized, and the assembling efficiency and the working quality are improved.

Drawings

Fig. 1 is a schematic structural view of an upper panel in a thrust bearing test bed for a main pump of a nuclear power plant according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a lower panel in a test bed for a thrust bearing of a main pump of a nuclear power plant according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a radial thrust bearing rotor in a thrust bearing test bed of a main pump of a nuclear power plant according to an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a loader rotor in a test bed of a main pump thrust bearing of a nuclear power plant according to an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a rotor small mount in a test bed for a thrust bearing of a main pump of a nuclear power plant provided in an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a loader in a test bed of a main pump thrust bearing of a nuclear power plant according to an embodiment of the present application;

FIG. 7 is a schematic structural diagram of a thrust shoe disc in a test bed of a main pump thrust bearing of a nuclear power plant according to an embodiment of the present application;

FIG. 8 is a schematic partial structural view of a thrust shoe disc in a test bed of a thrust bearing of a main pump of a nuclear power plant according to an embodiment of the present application;

FIG. 9: the structure schematic diagram of the radial thrust bearing of the assembling method of the million kilowatt nuclear main pump water lubrication thrust bearing test bed provided by the invention is shown;

10a and 10b are schematic structural diagrams of a radial thrust bearing rotor centering device in a thrust bearing test bed of a main pump of a nuclear power plant provided by the embodiment of the application;

FIG. 11 is a schematic structural diagram of an upper shaft seal top cover unit in a main pump thrust bearing test bed of a nuclear power plant according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a nuclear power plant main pump thrust bearing test bed provided in an embodiment of the present application.

In the figure:

1-a base; 2-bolt A; 3-a motor supporting seat; 4-nut A; 5-bolt B; 6-motor support; 7-a motor; 8-bolt C; 9-a loader; 10-bolt D; 11-coupling a; 12-lower torquemeter; 13-coupling b; 14-bolt E; 15-positioning pin A; 16-a radial thrust bearing; 17-bolt F; 18-a bearing chamber housing; 19-bolt G; 20-a shaft seal top cover; 21-coupler C;22 bolts a; 23-upper torquemeter; 24-nut B; 25-bolt H; 26-bolt I; 27-nut C; 28-coupling E; 29-coupling e; 30-rolling bearing a; 31-bearing gland a; 32-a bearing seat; 33-bolt J; 34-sealing ring A; 35-lower tile seat; 36-lower tile; 37-loader thrust disc; 38-upper tile; 39-bolt K; 40-mounting a tile seat; 41-loader upper cover; 42-coupling A; 43-nut D; 44-loader shaft; 45-bearing gland B; 46-bolt L; 47-rolling bearing B; 48-bolt M; 49-seal ring B; 50-bolt N; 51-a loader housing; 52-nut E; 53-spring compensation pads; 54-a lower thrust plate; 55-lower panel; 56-bearing thrust disc; 57-positioning pin B; 58-locating pin C; 59-screw A; 60-bolt O; 61-a radial bearing; 62-a pump shaft; 63-upper bearing cover; 64-nut F; 65-stud A; 66-adjusting the backing plate; 67-upper thrust disc; 68-upper panel; 69-bolt P; 70-positioning pin D; 71-bolt Q; 72-a lower machine seal stator unit; 73-shaft sleeve; 74-screw B; 75-coupling B; 76-a spindle nose flange; 77-screw cap; 78-stud B; 79-sealing ring C; 80-screw pump stator; 81-bolt R; 82-machine seal screw A; 83-a mechanical seal ring A; 84-mechanical seal ring A; 85-seal ring D; 86-bolt S; 87-screw pump rotor; 88-sealing ring E; 89-bolt T; 90-bolt U; 91-radial bearing inner sleeve; 92-machine seal screw B;93 a mechanical seal ring B; 94-nut G; 95-mechanical seal ring B; 96-seal ring F; 97-bolt V; 98-bolt W; 99-bolt X; 100-upper sealing stator unit; 101-upper panel outer ring; 102-large rubber ring of upper breadth plate; 103-upper panel tiles; 104-upper breadth plate small rubber ring; 105-upper breadth plate internal compression ring; 106-upper panel tray body; 107-upper separator bar; 108-lower panel tray; 109-lower panel outer ring; 110-large rubber ring of lower breadth plate; 111-lower panel tiles; 112-a small rubber ring of the lower breadth plate; 113-lower breadth plate internal compression ring; 114-bolt Y; 115-lower separator bar; 116-an upper balance weight; 117-a tile tray base; 118-a counterweight base; 119-lower counterbalance; 120-screw C; 121-thrust pads; 122-thrust shoe base; 123-rubber rope; 124-thrust shoe pressing plate; 125-bearing rotor centering device; 126-thrust disc compression ring; 127-bolt Z; 128-positioning pin E; 129-positioning pin F; 130-bolt b; 131-fixing disc; 132-an adjustment lever; 133-bolt c; 134-positioning pin G; 135-radial thrust bearing rotor; 136-a loader rotor; 137-upper shaft sealing top cover unit.

Detailed Description

In order to make the technical solutions in the embodiments of the present application more clearly understood and fully described below by those skilled in the art, the technical solutions in the embodiments of the present application will be described with reference to the drawings in the embodiments of the present application. It should be apparent that the embodiments described below are only some of the embodiments of the present application, and not all of them. All other embodiments that can be derived by a person skilled in the art from the embodiments described herein without inventive step are within the scope of the present application.

The nuclear power station main pump thrust bearing test bed and the assembling method thereof provided by the embodiment of the application standardize the assembling process of the test bed, can effectively guide the assembling work of the test bed, and solve the problems of difficult assembling and centering of multi-section shaft combined rotors and the like through measures of additionally installing positioning pins at the connection and matching positions of the segmented rotors, designing and manufacturing a bearing rotor centering device and the like, ensure the assembling quality and ensure the smooth proceeding of the main pump bearing bush localization test bed. Meanwhile, the assembly method is modularized, the workload of repeated assembly is reduced, and the working efficiency is improved.

Based on the above, in order to clearly and specifically explain the above advantages of the present application, the following description of the embodiments of the present application will be made with reference to the accompanying drawings.

Referring to fig. 1-12, a nuclear power plant main pump thrust bearing test bench provided in an embodiment of the present application includes: the device comprises a base 1, a loader 9, a lower torquemeter 12, a motor supporting seat 3, a radial thrust bearing 16, an upper torquemeter 23, a motor bracket 6 and a motor 7;

a shell is arranged among the base 1, the motor supporting seat 3 and the motor bracket 6; the loader 9, the lower torque meter 12, the radial thrust bearing 16 and the upper torque meter 23 are arranged in the shell;

the loader 9 is fixed on the base 1, the upper end of the loader is fixed with the lower end of the lower torque meter 12, and a first positioning pin 15 is arranged on the loader;

a radial thrust bearing 16 is fixed on the motor supporting seat 3, and a first through hole is formed in the middle of the motor supporting seat; the upper end of the lower torque meter 12 passes through the first through hole to be fixed with the lower end of the radial thrust bearing 16, and is provided with a second positioning pin 134; a test pad block is fixed at the contact position of the stator of the radial thrust bearing 16 and the bearing rotor 135;

a second through hole is formed in the motor bracket 6, and the motor 7 is fixed on the motor bracket; the lower end of the upper torque meter 23 is fixed with the upper end of the radial thrust bearing 16 and is provided with a third positioning pin 128, the upper end of the upper torque meter 23 passes through the second through hole and is connected with the motor 7 through a coupler, and is provided with a fourth positioning pin 129.

It can be understood that, because each rotor connecting part is provided with the positioning pin, the position of reinstalling after each disassembly is ensured to be unchanged, and therefore, the rotor small-installing operation is not required to be carried out in the subsequent assembling process.

In some possible implementations of the embodiment of the present application, the upper end of the radial thrust bearing 16 is fixed with a rotor centering device 125 for preventing the relative position of the bearing rotor 135 and the stator from changing during the integral hoisting process of the radial thrust bearing 16.

It can be understood that the application of the radial thrust bearing centering device 125 prevents the relative position of the rotor and the stator from changing in the integral hoisting process of the radial thrust bearing chamber, avoids repeatedly adjusting the center of the rotor after the bearing chamber is integrally reinstalled, optimizes the assembly process, and improves the assembly efficiency and the working quality.

In some possible implementations of the embodiment of the present application, the bearing rotor 135 is fixed to the pump shaft 62, and the pump shaft 62 is fixed to the lower end of the upper torque meter 23; rotor centering device 125, comprising: a fixed plate 131 and four adjusting rods 132;

the fixed disc 131 is of an annular structure, the bottom surface of the fixed disc is fixed with the upper end of the radial thrust bearing 16, and the middle opening is larger than the diameter of the pump shaft 62; the four adjustment rods 132 are perpendicular to each other, and one end of each adjustment rod is fixed on the fixed disc 131, and the other end of each adjustment rod is used for locking the position of the pump shaft 62.

In some possible implementations of the embodiment of the present application, the radial thrust bearing 16 further includes: bearing thrust disc 56, upper web plate 68, lower web plate 55;

the upper web plate 68 and the lower web plate 55 are respectively fixed on the upper side and the lower side of the bearing thrust disc 56;

the upper side of the upper panel 68 is provided with an upper test tile 103 and an upper separation strip 107 which are oppositely arranged; the lower side of the lower panel 55 is provided with a lower test tile 111 and a lower separation strip 115 which are oppositely arranged;

the upper side of the upper web plate 68 and the lower side of the lower web plate 55 are in contact with the stator of the radial thrust bearing 16.

In some possible implementations of the embodiment of the present application, the radial thrust bearing 16 further includes: lower thrust disc 54, upper thrust disc 67 and bearing housing shell 18;

the lower thrust disc 54 is fixed in the bearing chamber shell 18, and the tile surface of the lower panel 55 is in contact with the tile surface of the lower thrust disc 54;

the upper thrust plate 67 is fixed in the bearing housing shell 18 with the shoe face of the upper thrust plate 67 in contact with the shoe face of the upper web 68.

In some possible implementations of the embodiment of the present application, the lower thrust plate 54 or the upper thrust plate 67 includes: an upper counterweight 116, a shoe plate base 117, a counterweight base 118, a lower counterweight 119, a thrust shoe 121, a thrust shoe base 122, and a thrust shoe pressure plate 124;

the lower counterbalance 119 is mounted on the counterbalance base 118, and the upper counterbalance 116 is mounted on the lower counterbalance 119;

the thrust shoe base 122 and the thrust shoe 121 form a thrust shoe unit and are mounted at corresponding positions of the upper balance weight 116; thrust shoe press plates 124 are mounted on both sides of the thrust shoe base 122.

In some possible implementation manners of the embodiment of the present application, the loader 9 includes: the loader rotor 136 and the loader housing 51;

the lower coupling a11 of the lower torquemeter 12 is connected with the coupling a42 of the loader rotor 136;

the loader rotor 136 is mounted within the loader housing 51;

the loader shell 51 is internally provided with an upper pad 38 and a lower pad 36, and the lower end surface of a loader thrust disc 37 on the loader rotor 136 is tightly attached to the surface of the lower pad 36.

Based on the nuclear power station main pump thrust bearing test bed provided by the embodiment, the embodiment of the application also provides an assembling method of the nuclear power station main pump thrust bearing test bed, and the assembling method is applied to any one of the nuclear power station main pump thrust bearing test beds provided by the embodiment.

The assembling method of the test bed for the thrust bearing of the main pump of the nuclear power station, provided by the embodiment of the application, comprises the following steps:

step 1: an amplitude plate for assembling the radial thrust bearing 16;

step 2: a bearing rotor 135 to which the radial thrust bearing 16 is fitted;

and step 3: a loader rotor 136 to which the loader 9 is fitted;

and 4, step 4: a rotor sub-assembly connecting the loader rotor 136, the bearing rotor 135, the lower torque meter 12 and the upper torque meter 23;

and 5: assembling the loader 9;

step 6: a thrust shoe plate to which the radial thrust bearing 16 is fitted;

and 7: a bearing chamber in which the radial thrust bearing 16 is fitted;

and 8: assembling an upper shaft seal top cover unit;

and step 9: and (6) integrally assembling the test bed.

The specific assembly method of each step is illustrated in detail below by way of example:

step 1: a web plate for assembling said radial thrust bearing 16, comprising;

step 1.1: the upper panel 68 is assembled; as shown in fig. 1, step 1.1 specifically includes:

step 1.1.1: the upper separation bars 107 are sequentially installed back into the corresponding pin holes in the upper panel disc 106;

step 1.1.2: the tile blocks 103 of the upper panel are installed back on the tray body 106 of the upper panel, and the serial numbers of the tile blocks are recorded;

step 1.1.3: mounting the upper panel large rubber ring 102 and the upper panel small rubber ring 104;

step 1.1.4; the upper breadth plate outer pressure ring 101 and the upper breadth plate inner pressure ring 105 are installed back;

step 1.1.5: lifting the whole breadth plate to 200mm height, respectively installing two bolts V97 and W98 on opposite angles and locking;

step 1.1.6: and turning the breadth plate to face upwards, sequentially installing the rest bolts V97 and W98, and fastening by adopting a cross method.

Step 1.2: the lower panel 55 is assembled; as shown in fig. 2, step 1.2 specifically includes:

step 1.2.1: the lower separator bar 115 is installed back into the corresponding pin hole in the lower panel tray 108 as marked;

step 1.2.2: the tile blocks 111 of the lower panel are installed back on the tray body 108 of the lower panel, and the serial numbers of the tile blocks are recorded;

step 1.2.3: the large rubber ring 110 of the lower breadth panel and the small rubber ring 112 of the upper breadth panel are installed back;

step 1.2.4: the lower breadth panel outer pressure ring 109 and the lower breadth panel inner pressure ring 113 are installed back;

step 1.2.5: the bolt Y114 is reinstalled and tightened using the criss-cross method.

As shown in fig. 3, step 2: the bearing rotor 135 equipped with the radial thrust bearing 16 specifically comprises:

step 2.1: the bearing thrust disc 56 is supported on the maintenance square box in the positive direction and is leveled by using a level gauge;

step 2.2: the radial bearing inner sleeve 91 is installed back on the bearing thrust disc 56 and is fastened by using a bolt T90;

step 2.3: mounting the upper panel 68 back to the bearing thrust disc 56 and fastening with bolts P69;

step 2.4: the sealing ring F96, the mechanical sealing ring B95 and the mechanical sealing ring B93 are sequentially installed again and fastened by using a mechanical sealing screw B92;

step 2.5: turning over the bearing thrust disc 56 by using a crane, enabling the back of the bearing thrust disc 56 to be upwards supported on the maintenance square box, and leveling by using a level gauge;

step 2.6: the lower panel 55 is mounted back on the bearing thrust disc 56 and fastened by using bolts S89;

step 2.7: the sealing ring E88 is installed again, the threaded pump rotor 87 is installed again on the bearing thrust disc 56 and is fastened by using a bolt R86;

step 2.8: the sealing ring D85, the mechanical sealing ring A84 and the mechanical sealing ring A83 are sequentially installed in a reinstalling mode and fastened through a mechanical sealing screw A82;

step 2.9: the pump shaft 62 is erected using a crane;

step 2.10: turning the bearing thrust disc 56 upwards by using a crane, slowly loading the erected pump shaft 62 into the hole of the thrust disc 56, and fastening by using a nut G94;

step 2.11: the stud bolt B78, the coupling B75 and the shaft head flange 76 are sequentially installed back on the pump shaft 62 and fastened by the nut 77.

As shown in fig. 4, step 3: the loader rotor 136, on which the loader 9 is assembled, specifically includes:

step 3.1: the inner ring of the rolling bearing A30 and the inner ring of the rolling bearing B47 are respectively installed back to corresponding positions on the loader shaft 44;

step 3.2: placing the loader thrust disk 37 on a special service rack, and mounting the loader shaft 44 into the center hole of the loader thrust disk 37 and fastening with a nut E52;

step 3.3: the coupling a42 is mounted to the loader shaft 44 and tightened using the nut D43.

As shown in fig. 5, step 4: the rotor is small-sized, and is connected with the loader rotor 136, the bearing rotor 135, the lower torque meter 12 and the upper torque meter 23, and specifically includes:

step 4.1: connecting a lower coupling a11 of the lower torque meter 12 with a coupling a42 of the loader rotor 136, and fastening with a bolt D10;

step 4.2: connecting a coupler B75 of the radial thrust bearing rotor 135 with an upper coupler B13 of the lower torque meter 12, and fastening by using a bolt E14;

step 4.3: the coupling C21 is remounted to the pump shaft 62, the lower end face of the upper torque meter 23 is connected with the coupling C21, and is fastened by using a bolt a 22;

step 4.4: connecting a coupler E28 with the upper end face of the upper torque meter 23, and fastening by using a bolt H25 and a nut B24;

step 4.8: positioning pins, namely a positioning pin A15, a positioning pin G137, a positioning pin E128 and a positioning pin F129 are arranged and configured at the connecting part of each coupler, so that the mounting position of each matched part is ensured to be unchanged during each assembling;

step 4.9: horizontally placing the rotor on a dynamic balancing machine, fixing stator parts of an upper torque meter and a lower torque meter, adopting G1.0-grade quality dynamic balance for the bearing rotor, and removing weights on a bearing thrust disc 56 and a loader thrust disc 37;

step 4.10: disassembling the rotor, disassembling the bolt D10, the bolt E14 and the bolt a22, and disassembling the coupling A42 and the coupling a11, the coupling B75 and the coupling B13, and the coupling C21 and the upper torque meter 23 which are connected;

step 4.11: placing the decomposed radial bearing rotor component and the rotor component of the torque meter on corresponding racks;

step 4.12: disassembling the screw cap 77, and sequentially disassembling the shaft head flange 76 and the coupling B75 from the pump shaft 62;

step 4.13: the nut D43 is removed and the coupling a42 is removed from the loader shaft 44.

Because each rotor connecting part is additionally provided with the positioning pin, the position of the rotor connecting part which is disassembled and assembled again is ensured to be unchanged, and therefore, the rotor small-assembling operation is not required to be carried out in the subsequent assembling process.

As shown in fig. 6, step 5: assembling the loader 9, specifically including:

step 5.1: the outer ring of the rolling bearing A30 is installed on the bearing seat 32 in a reinstalling mode, and the bearing cover A31 is installed on the bearing seat 32 in a reinstalling mode and fixed;

step 5.2: the loader housing 51 is turned upside down, the bearing seat 32 is mounted back on the housing 51 and fixed by using a bolt J33;

step 5.3: turning the loader shell 51 to the front side upwards, reinstalling the lower shoe seat 35 into the loader shell 51, fastening by using a bolt N50, and reinstalling until the loader shell is aligned with the oil inlet;

step 5.4: the sealing ring A34 and the sealing ring B49 are installed back into the lower tile seat 35, and the lower tile 36 is installed back into the lower tile seat 35;

and step 5.5: the loader rotor 136 without the coupler A42 is installed back into the loader shell 51, so that the lower end face of the loader thrust disc 37 is tightly attached to the lower shoe 36;

step 5.6: placing the loader upper cover 41 horizontally upwards, reinstalling the outer ring of the rolling bearing B47 to the corresponding position of the loader upper cover 41, reinstalling the bearing cover B45, and fastening by using a bolt L46;

step 5.7: turning over the loader upper cover 41 to the back side upwards, mounting the upper tile seat 40 to the corresponding position of the loader upper cover 41, and fastening by using a bolt K39;

step 5.8: the sealing ring A34 and the sealing ring B49 are installed back in the upper tile seat 40, and the upper tile 38 is installed back in the upper tile seat 40;

step 5.9: the loader upper cover 41 provided with the upper tile is turned over to the front side upwards, and is installed back into the loader shell 51 and fastened by using a bolt M48;

step 5.10: the coupling a42 is reinstalled onto the loader shaft 44 and tightened using the nut D43.

As shown in fig. 7 and 8, step 6: the thrust shoe disc on which the radial thrust bearing 16 is assembled comprises a lower thrust disc 54 and an upper thrust disc 67, which in particular comprise:

step 6.1: the thrust shoe pressure plate 124 on one side of the thrust shoe base 122 is installed back and is fastened by using a screw C120;

step 6.2: the thrust shoe 121 and the rubber rope 123 are installed back on the thrust shoe base 122, the thrust shoe pressing plate 124 on the other side is installed back, and the fastening is carried out through the screw C120;

step 6.3: the balance weight base 118 is installed back to the corresponding position in the tile tray base 117, and the balance weight base is prevented from being jammed during installation;

step 6.4: the lower counterweight 119 is retro-fitted to the counterweight base 118 as marked;

step 6.5: the upper balance weight 116 is re-installed on the lower balance weight 119 according to the mark, and the upper balance weight is taken lightly when the upper balance weight is re-installed;

step 6.6: the thrust shoe unit consisting of the thrust shoe base 122 and the thrust shoe block 121 is installed back to the corresponding position of the upper balance weight 116 according to the mark;

step 6.7: thrust disk clamp ring 127 is reinstalled onto tile disk base 117 and tightened using bolt Z127.

As shown in fig. 9, step 7: a bearing chamber in which the radial thrust bearing 16 is fitted;

step 7.1: placing the bearing housing shell 18 on an inspection square box and leveling with a level gauge;

and 7.2: the sleeve 73 is fitted back into the bearing housing shell 18 and fastened using screws B74;

step 7.3: the seal ring C79 and the lower machine seal stator unit 72 are sequentially reinstalled into the bearing chamber housing 18 and fastened using the bolt Q71;

step 7.4: the screw pump stator 80 is reinstalled into the bearing chamber housing 18 and fastened using bolts R81;

step 7.5: the spring compensating pad 53 is reinstalled into the bearing housing shell 18, taking care that the compensating pad locating hole is aligned with the locating pin D70;

step 7.6: the lower thrust disc 54 is back-fitted into the bearing housing shell 18;

step 7.7: the radial thrust bearing rotor without the coupling is mounted back into the bearing chamber housing 18 so that the lower panel 55 of the rotor contacts the lower thrust plate 54;

step 7.8: turning the upper push disc 67 to a position with the tile facing downwards, reinstalling the adjusting backing plate 66, and fastening by using a screw A59;

step 7.9: the upper thrust plate 67 is mounted back into the bearing housing shell 18 so that the shoe faces of the upper thrust plate 67 contact the shoe faces of the upper panel 68;

step 7.10: the bearing upper cover 63 is installed back into the bearing chamber shell 18, during the installation, the positioning pin C58 on the bearing upper cover 63 is aligned with the positioning hole of the upper thrust plate 67, and the stud A65 and the nut F64 are used for fastening;

step 7.11: the radial bearing 61 is reinstalled on the bearing upper cover 63 and fastened using the bolt O60;

step 7.12: the radial thrust bearing centering device 125 is used for adjusting the circumferential gap of the radial bearing to be uniform, as shown in fig. 10a and fig. 10b, after the adjustment is completed, the adjusting rod 132 is tightly pushed, so that the relative position of the rotor and the stator in the bearing chamber is fixed;

step 7.13: the stud C78, the coupling B75 and the shaft head flange 76 are sequentially installed back on the pump shaft 62 and fastened by the nut 77.

The application of the radial thrust bearing centering device 125 prevents the relative position of the rotor and the stator from changing in the integral hoisting process of the radial thrust bearing chamber, avoids repeatedly adjusting the center of the rotor after the bearing chamber is integrally reinstalled, optimizes the assembly process and improves the assembly efficiency and the working quality;

as shown in fig. 11, step 8: the assembly upper shaft seal top cap unit specifically includes:

step 8.1: placing the back of the shaft seal top cover 20 upwards;

step 8.2: the upper seal stator unit 100 is reinstalled on the shaft seal top cover 20 and fastened by using a bolt X99;

step 8.3: the upper shaft seal top cover unit 137 is turned to the front side and placed upward, and waits for reloading.

As shown in fig. 12, step 9: the test bench unit mount specifically includes:

step 9.1: placing the base 1 on a test field, and leveling by using a level gauge;

step 9.2: the loader 9 is reinstalled into the base 1 and fastened using bolts C8;

step 9.3: the lower torque meter 12 is installed back, the coupler a11 is connected with the coupler A42, the positioning pin A15 is installed, and the bolt D10 is used for fastening;

step 9.4: the motor supporting seat 3 is installed on the base 1 again, and the position of the motor supporting seat 3 is adjusted to enable the lower torquemeter coupler b13 to be located in the center of the inner hole of the motor supporting seat 3;

step 9.5, leveling the motor supporting seat 3 by using a level gauge, and fastening by using a bolt A2;

step 9.6: the radial thrust bearing 16 is installed back into the motor support base 3, the coupler B75 is connected with the coupler B13, the positioning pin A15 is installed and fastened by using the bolt E14, and meanwhile, the bolt F17 is installed back and fastened;

step 9.7: when the bolt E14 and the bolt F17 are installed back, interference or stress cannot exist, and if the position of the motor supporting seat 3 is abnormal, the position is adjusted;

step 9.8: disassembling the radial thrust bearing centering device 125, and measuring the gaps around the radial bearing uniformly;

step 9.9: the upper shaft seal top cover unit 137 is remounted to the bearing upper cover 63 and fastened using bolts G19;

step 9.10: the coupling C21 is mounted on the pump shaft 62;

step 9.11: the upper torquemeter 23 is reinstalled, the lower end face of the upper torquemeter is connected with the coupler C21, and the upper torquemeter is fastened by using a bolt a 22;

step 9.12: connecting the motor bracket 6 with the motor 7 and fastening by using a bolt b 130;

step 9.13: integrally mounting the connected motor bracket 6 and the motor 7 on the motor support seat 3 again, and mounting a bolt B5 again;

step 9.14: centering work of a coupler E28 and a coupler E29 is carried out, and centering data are adjusted through the matching position of the motor support 6 and the motor support seat 3;

step 9.15: after centering, the bolt B5 is fastened, the bolt I26 and the nut C27 are reinstalled, and fastening is carried out.

According to the assembling method of the nuclear power station main pump thrust bearing test bed provided by the embodiment of the application, the assembling method is modularized, corresponding steps can be directly extracted to guide the test bed assembling work, the assembling method is simple and clear, and a plurality of special tools are designed and manufactured according to the assembling process of the test bed to optimize the assembling process. In addition, in the test process, in order to inspect the disassembly and assembly operation of the running state of the domestic bearing bush, parts do not need to be replaced under normal conditions, so that the radial thrust bearing rotor and the loader rotor do not need to be disassembled again in the subsequent disassembly and assembly operation, positioning pins are additionally arranged at the matching and connecting positions of the rotors in each section in the first assembly process, the relative positions of the rotor parts are kept unchanged after each re-assembly, and meanwhile, the small assembly operation of the rotors is not needed to be performed subsequently.

The present application has been described in detail with reference to the drawings and examples, but the present application is not limited to the above examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application. The prior art can be used for all the matters not described in detail in this application.

Claims

1. The utility model provides a nuclear power station main pump thrust bearing test bench, its characterized in that, the rack includes: the device comprises a base (1), a loader (9), a lower torque meter (12), a motor supporting seat (3), a radial thrust bearing (16), an upper torque meter (23), a motor bracket (6) and a motor (7);

shells are arranged among the base (1), the motor supporting seat (3) and the motor bracket (6); the loader (9), the lower torque meter (12), the radial thrust bearing (16) and the upper torque meter (23) are arranged in the shell;

the loader (9) is fixed on the base (1), the upper end of the loader is fixed with the lower end of the lower torque meter (12), and a first positioning pin (15) is arranged on the loader;

the radial thrust bearing (16) is fixed on the motor supporting seat (3), and a first through hole is formed in the middle of the motor supporting seat; the upper end of the lower torque meter (12) penetrates through the first through hole to be fixed with the lower end of the radial thrust bearing (16), and a second positioning pin (134) is arranged; a test pad block is fixed at the contact position of the stator of the radial thrust bearing (16) and the bearing rotor (135);

a second through hole is formed in the motor support (6), and the motor (7) is fixed on the motor support; the lower end of the upper torque meter (23) is fixed with the upper end of the radial thrust bearing (16), a third positioning pin (128) is arranged, the upper end of the upper torque meter (23) penetrates through the second through hole, is connected with the motor (7) through a coupler, and is provided with a fourth positioning pin (129).

2. The test bench for the thrust bearing of the main pump of the nuclear power plant as claimed in claim 1, characterized in that a rotor centering device (125) is fixed at the upper end of the radial thrust bearing (16) for preventing the relative position of the bearing rotor (135) and the stator from changing during the integral hoisting process of the radial thrust bearing (16).

3. The nuclear power plant main pump thrust bearing test rig according to claim 2, wherein the bearing rotor (135) is fixed with a pump shaft (62), and the pump shaft (62) is fixed with a lower end of the upper torque meter (23); the rotor centering device (125) comprising: a fixed disc (131) and four adjusting rods (132);

4. The nuclear power plant main pump thrust bearing test rig according to claim 3, wherein the radial thrust bearing (16) further comprises: a bearing thrust disc (56), an upper panel (68) and a lower panel (55);

the upper breadth plate (68) and the lower breadth plate (55) are respectively fixed on the upper side and the lower side of the bearing thrust disc (56);

the upper side of the upper breadth plate (68) is provided with an upper test tile block (103) and an upper separation strip (107) which are oppositely arranged; a lower test tile block (111) and a lower separation strip (115) which are oppositely arranged are arranged on the lower side of the lower panel (55);

5. The nuclear power plant main pump thrust bearing test stand of claim 4, wherein the radial thrust bearing (16) further comprises: a lower thrust plate (54), an upper thrust plate (67) and a bearing housing shell 18;

6. The nuclear power plant main pump thrust bearing test stand of claim 4, wherein the lower thrust disk (54) or the upper thrust disk (67) includes: the balance weight device comprises an upper balance weight (116), a tile disc base (117), a balance weight base (118), a lower balance weight (119), a thrust tile block (121), a thrust tile base (122) and a thrust tile pressing plate (124);

the thrust shoe base (122) and the thrust shoe block (121) form a thrust shoe unit and are arranged at corresponding positions of the upper balance block (116); the thrust shoe pressing plates (124) are mounted on two sides of the thrust shoe base (122).

7. The nuclear power plant main pump thrust bearing test stand according to any one of claims 1 to 6, characterized in that the loader (9) comprises: a loader rotor (136) and a loader housing (51);

the loader rotor (136) is mounted within the loader housing (51);

8. A method for assembling a nuclear power station main pump thrust bearing test bed is characterized by being applied to the nuclear power station main pump thrust bearing test bed of any one of claims 1 to 7; the method comprises the following steps:

step 1: -assembling the web of the radial thrust bearing (16);

and step 3: -assembling a loader rotor (136) of the loader (9);

and 5: -assembling the loader (9);

step 6: a thrust shoe plate to which the radial thrust bearing (16) is fitted;

and 7: a bearing chamber in which the radial thrust bearing (16) is fitted;

and step 8: assembling an upper shaft seal top cover unit;

and step 9: and (6) integrally assembling the test bed.

9. The assembling method of the test bed for the thrust bearing of the main pump of the nuclear power plant as claimed in claim 8, wherein the step 1 specifically comprises:

Step 1.2: assembling a lower panel (55); step 1.2, specifically comprising:

10. The assembling method of the test bed for the thrust bearing of the main pump of the nuclear power plant as claimed in claim 8, wherein the step 2 specifically comprises:

step 2.1: a bearing thrust disc (56) is supported on the maintenance square box in the positive direction and is leveled by a level gauge;

step 2.2: a radial bearing inner sleeve (91) is installed on the bearing thrust disc (56) in a reinstalling mode and is fastened through a bolt T (90);

step 2.9: erecting the pump shaft (62) by using a crane;

step 2.10: turning over the bearing thrust disc (56) by a crane to enable the front face to face upwards, slowly loading the erected pump shaft (62) into the thrust disc (56) Kong Zhongla to lean against, and fastening by using a nut G (94);

11. The assembling method of the test bed for the thrust bearing of the main pump of the nuclear power plant as claimed in claim 8, wherein the step 3 specifically comprises:

12. The assembling method of the test bed for the thrust bearing of the main pump of the nuclear power plant as claimed in claim 8, wherein the step 4 specifically includes:

step 4.2: connecting a coupling B (75) of a radial thrust bearing rotor (135) with an upper coupling B (13) of a lower torque meter (12) and fastening by using a bolt E (14);

step 4.6: measuring the deflection and the runout of a rotor, wherein the standard is required to be within 0.05 mm;

step 4.10: disassembling a rotor, disassembling a bolt D (10), a bolt E (14) and a bolt a (22), and disassembling a coupling A (42) and a coupling a (11), a coupling B (75) and a coupling B (13) which are connected, and a coupling C (21) and an upper torque meter (23);

13. The assembling method of the test bed for the thrust bearing of the main pump of the nuclear power plant as claimed in claim 8, wherein the step 5 specifically comprises:

and step 5.2: turning the loader shell (51) to the back side upwards, and reinstalling the bearing seat (32) onto the shell (51) and fixing the bearing seat by using a bolt J (33);

step 5.5: the loader rotor (136) without the coupling A (42) is installed back into the loader shell (51), so that the lower end face of the loader thrust disc (37) is attached to the lower tile (36);

14. The assembling method of the test bed for the thrust bearing of the main pump of the nuclear power plant as claimed in claim 8, wherein the step 6 specifically includes:

step 6.2: the thrust shoe block (121) and the rubber rope (123) are installed on the thrust shoe base (122) in a reinstalling mode, the thrust shoe pressing plate (124) on the other side is installed in a reinstalling mode, and the bolt C (120) is used for fastening;

step 6.4: mounting the lower counterweight (119) back to the counterweight base (118) as marked;

15. The assembling method of the test bed for the thrust bearing of the main pump of the nuclear power plant as claimed in claim 8, wherein the step 7 specifically comprises:

step 7.1: placing the bearing chamber shell (18) on an overhauling square box and leveling by using a level gauge;

16. The assembling method of the test bed for the thrust bearing of the main pump of the nuclear power plant as claimed in claim 8, wherein the step 8 specifically comprises:

step 8.1: placing the back of the shaft seal top cover (20) upwards;

step 8.2: the upper sealing stator unit (100) is installed on the shaft sealing top cover (20) in a reinstalling mode and is fastened through a bolt X (99);

step 8.3: and turning the upper shaft sealing top cover unit (137) to the front side and placing the upper shaft sealing top cover unit upwards to wait for reloading.

17. The assembling method of the test bed for the thrust bearing of the main pump of the nuclear power plant as claimed in any one of claims 8 to 16, wherein the step 9 specifically comprises:

step 9.2: the loader (9) is installed back into the base (1) and is fastened by using a bolt C (8);

step 9.3: the lower torquemeter (12) is installed again, the coupler a (11) is connected with the coupler A (42), the positioning pin A (15) is installed, and the lower torquemeter is fastened by using the bolt D (10);

step 9.6: the radial thrust bearing (16) is installed back in the motor support base (3), a coupler B (75) is connected with a coupler B (13), a positioning pin A (15) is installed and fastened by using a bolt E (14), and a bolt F (17) is installed back and fastened;