A test bench for the thrust bearing of the main pump of a nuclear power plant and its assembly method

Abstract

This application belongs to the technical field of maintenance engineering for rotating equipment of a station, and specifically relates to a test bench for the thrust bearing of a nuclear power plant main pump and its assembly method. The test bench for the thrust bearing of the nuclear power plant main pump includes: a base, a loader, a lower torque meter, a motor support seat, a radial thrust bearing, an upper torque meter, a motor bracket, and a motor; the loader is fixed on the base, and the upper end is fixed to the lower end of the lower torque meter and is provided with a first positioning pin; the upper end of the lower torque meter passes through the first through hole and is fixed to the lower end of the radial thrust bearing and is provided with a second positioning pin; the lower end of the upper torque meter is fixed to the upper end of the radial thrust bearing and is provided with a third positioning pin, and the upper end of the upper torque meter passes through the second through hole and is connected to the motor through a coupling and is provided with a fourth positioning pin, solving the problems of difficult assembly and alignment of the multi-segment shaft combined rotor in the prior art and ensuring the assembly quality.

Description

Technical Field

[0001] This application belongs to the technical field of maintenance engineering for rotating equipment in nuclear power plants, and particularly relates to a test bench for the thrust bearing of a nuclear power plant main pump and an assembly method thereof. Background Art

[0002] The thrust bearing of the main pump of a certain nuclear power plant unit is a water-lubricated non-hydrodynamic bearing, and the bearing bush material is siliconized graphite. It bears an axial force of about 440 KN during normal operation and belongs to a large-thrust water-lubricated bearing for a nuclear main pump of one million kilowatts. During the development of the thrust bearing, an important link is to conduct bench tests. By simulating the real operating state of the thrust bearing in the main pump through the test bench, a series of performance tests such as normal working conditions, over-design working conditions, and life running-in are carried out on the bearing material to provide a basis for the reliability of the bearing material and the complete localization of the main pump bearing.

[0003] However, the test bench generally has a structural form of a multi-section shaft combined rotor, with a complex and high-requirement assembly process, and it is difficult to adjust the matching dimensions between components. In addition, during the test, in order to monitor the operating state of the bearing bush at different time stages, the test bench needs to be disassembled and assembled multiple times. Therefore, the assembly of this bearing test bench is extremely challenging. Summary of the Invention

[0004] The purpose of this application is to provide a test bench for the thrust bearing of a nuclear power plant main pump and an assembly method thereof, to solve the problems of difficult assembly and alignment of the multi-section shaft combined rotor in the prior art, and to ensure the assembly quality.

[0005] Technical solutions for achieving the purpose of this application:

[0006] A test bench for the thrust bearing of a nuclear power plant main pump provided by an embodiment of this application includes: a base (1), a loader (9), a lower torque meter (12), a motor support seat (3), a radial thrust bearing (16), an upper torque meter (23), a motor bracket (6), and a motor (7);

[0007] Housings are provided between the base (1), the motor support 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 inside the housings;

[0008] The loader (9) is fixed on the base (1), and the upper end is fixed to the lower end of the lower torque meter (12), and a first positioning pin (15) is provided;

[0009] The radial thrust bearing (16) is fixed on the motor support base (3), and a first through hole is formed in the middle; the upper end of the lower torque meter (12) passes through the first through hole and is fixed to the lower end of the radial thrust bearing (16), and a second positioning pin (134) is provided; a test pad is fixed at the contact position between the stator of the radial thrust bearing (16) and the bearing rotor (135).

[0010] 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 to the upper end of the radial thrust bearing (16), and a third positioning pin (128) is provided. The upper end of the upper torque meter (23) passes through the second through hole and is connected to the motor (7) through a coupling, and a fourth positioning pin (129) is provided.

[0011] Optionally, a rotor centering device (125) is fixed to the upper end of the radial thrust bearing (16) to prevent the relative position between the bearing rotor (135) and the stator from changing during the overall hoisting process of the radial thrust bearing (16).

[0012] Optionally, 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); the rotor centering device (125) includes: a fixing disk (131) and four adjusting rods (132).

[0013] The fixing disk (131) is of an annular structure, the bottom surface of which is fixed to 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 adjusting rods (132) are perpendicular to each other, one end of which is fixed to the fixing disk (131), and the other end is used to lock the position of the pump shaft (62).

[0014] Optionally, the radial thrust bearing (16) further includes: a bearing thrust disk (56), an upper web panel (68), and a lower web panel (55).

[0015] The upper web panel (68) and the lower web panel (55) are respectively fixed to the upper and lower sides of the bearing thrust disk (56).

[0016] On the upper side of the upper web panel (68), an upper test pad (103) and an upper separator (107) are arranged oppositely; on the lower side of the lower web panel (55), a lower test pad (111) and a lower separator (115) are arranged oppositely.

[0017] The upper side of the upper web panel (68) and the lower side of the lower web panel (55) are in contact with the stator of the radial thrust bearing (16).

[0018] Optionally, the radial thrust bearing (16) further includes: a lower thrust disc (54), an upper thrust disc (67), and a bearing housing (18);

[0019] The lower thrust disc (54) is fixed inside the bearing housing (18), and the tile surface of the lower web panel (55) is in contact with the tile surface of the lower thrust disc (54);

[0020] The upper thrust disc (67) is fixed inside the bearing housing (18), and the tile surface of the upper thrust disc (67) is in contact with the tile surface of the upper web panel (68).

[0021] Optionally, the lower thrust disc (54) or the upper thrust disc (67) includes: an upper balance weight (116), a tile disc base (117), a balance weight base (118), a lower balance weight (119), a thrust tile (121), a thrust tile base (122), and a thrust tile pressing plate (124);

[0022] 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);

[0023] The thrust tile base (122) and the thrust tile (121) form a thrust tile unit and are mounted at corresponding positions on the upper balance weight (116); the thrust tile pressing plates (124) are mounted on both sides of the thrust tile base (122).

[0024] Optionally, the loader (9) includes: a loader rotor (136) and a loader housing (51);

[0025] The coupling a (11) of the lower torque meter (12) is connected to the coupling A (42) of the loader rotor (136);

[0026] The loader rotor (136) is mounted inside the loader housing (51);

[0027] An upper tile (38) and a lower tile (36) are mounted inside the loader housing (51), and the lower end face of the loader thrust disc (37) on the loader rotor (136) is in close contact with the surface of the lower tile (36).

[0028] The embodiment of the present application also provides an assembly method for the thrust bearing test bench of a nuclear power plant main pump, which is applied to any one of the thrust bearing test benches of the nuclear power plant main pump provided in the above embodiments; the method includes:

[0029] Step 1: Assemble the web panels of the radial thrust bearing (16);

[0030] Step 2: Assemble the bearing rotor (135) of the radial thrust bearing (16);

[0031] Step 3: Assemble the loader rotor (136) of the loader (9);

[0032] Step 4: Conduct a small rotor assembly and connect the loader rotor (136), the bearing rotor (135), the lower torque meter (12), and the upper torque meter (23);

[0033] Step 5: Assemble the loader (9);

[0034] Step 6: Assemble the thrust washer disc of the radial thrust bearing (16);

[0035] Step 7: Assemble the bearing housing of the radial thrust bearing (16);

[0036] Step 8: Assemble the upper shaft capping unit;

[0037] Step 9: Conduct an overall assembly of the test bench.

[0038] Optionally, Step 1 specifically includes:

[0039] Step 1.1: Assemble the upper panel (68); Step 1.1 specifically includes:

[0040] Step 1.1.1: Reinstall the upper partition strip (107) into the corresponding pin holes in the upper panel disc body (106) in sequence;

[0041] Step 1.1.2: Reinstall the upper panel pads (103) onto the upper panel disc body (106) and record the pad numbers;

[0042] Step 1.1.3: Reinstall the upper panel large rubber ring (102) and the upper panel small rubber ring (104);

[0043] Step 1.1.4; Reinstall the upper panel outer pressure ring (101) and the upper panel inner pressure ring (105);

[0044] Step 1.1.5: Lift the entire panel 200 mm high, install two bolts V (97) and two bolts W (98) diagonally and lock them;

[0045] Step 1.1.6: Flip the panel over with the back side up, reinstall the remaining bolts V (97) and bolts W (98) in sequence, and tighten them using the cross method.

[0046] Step 1.2: Assemble the lower panel (55); Step 1.2 specifically includes:

[0047] Step 1.2.1: Reinstall the lower separating strip (115) into the corresponding pin holes in the lower panel body (108) according to the markings;

[0048] Step 1.2.2: Reinstall the lower panel tiles (111) onto the lower panel body (108), and record the tile numbers;

[0049] Step 1.2.3: Reinstall the large rubber ring (110) of the lower panel and the small rubber ring (112) of the upper panel;

[0050] Step 1.2.4: Reinstall the outer pressure ring (109) and the inner pressure ring (113) of the lower panel;

[0051] Step 1.2.5: Reinstall bolt Y (114), and tighten it using the cross-cross method.

[0052] Optionally, Step 2 specifically includes:

[0053] Step 2.1: Support the bearing thrust disc (56) upright on the maintenance square box, and level it using a spirit level;

[0054] Step 2.2: Reinstall the inner sleeve (91) of the radial bearing onto the bearing thrust disc (56), and tighten it using bolt T (90);

[0055] Step 2.3: Reinstall the upper panel (68) onto the bearing thrust disc (56), and tighten it using bolt P (69);

[0056] Step 2.4: Reinstall the sealing ring F (96), the mechanical seal dynamic ring B (95), and the mechanical seal pressure ring B (93) in sequence, and tighten them using the mechanical seal screw B (92);

[0057] Step 2.5: Use a crane to flip the bearing thrust disc (56) so that the back of the bearing thrust disc (56) is supported upright on the maintenance square box, and level it using a spirit level;

[0058] Step 2.6: Reinstall the lower panel (55) onto the bearing thrust disc (56), and tighten it using bolt S (89);

[0059] Step 2.7: Reinstall the sealing ring E (88), and reinstall the screw pump rotor (87) onto the bearing thrust disc (56), and tighten it using bolt R (86);

[0060] Step 2.8: Reinstall the sealing ring D (85), the mechanical seal dynamic ring A (84), and the mechanical seal pressure ring A (83) in sequence, and tighten them using the mechanical seal screw A (82);

[0061] Step 2.9: Use a crane to stand up the pump shaft (62);

[0062] Step 2.10: Use a crane to turn the bearing thrust disk (56) with the front side facing up, then slowly insert the erected pump shaft (62) into the hole of the thrust disk (56) until it seats firmly, and use nut G (94) to fasten it.

[0063] Step 2.11: Install the stud bolt B (78), coupling B (75), and shaft head flange (76) onto the pump shaft (62) in sequence, and use nuts (77) to fasten them.

[0064] Optionally, step 3 specifically includes:

[0065] Step 3.1: Install the inner rings of the rolling bearing A (30) and the rolling bearing B (47) onto the corresponding positions on the loader shaft (44) respectively.

[0066] Step 3.2: Place the loader thrust disk (37) on a dedicated maintenance bench, install the loader shaft (44) into the central hole of the loader thrust disk (37), and use nut E (52) to fasten it.

[0067] Step 3.3: Install the coupling A (42) onto the loader shaft (44), and use nut D (43) to fasten it.

[0068] Optionally, step 4 specifically includes:

[0069] Step 4.1: Connect the lower coupling a (11) of the lower torque meter (12) with the coupling A (42) of the loader rotor (136), and use bolt D (10) to fasten it.

[0070] Step 4.2: Connect the coupling B (75) of the radial thrust bearing rotor (135) with the upper coupling b (13) of the lower torque meter (12), and use bolt E (14) to fasten it.

[0071] Step 4.3: Install the coupling C (21) back onto the pump shaft (62), connect the lower end face of the upper torque meter (23) with the coupling C (21), and use bolt a (22) to fasten it.

[0072] Step 4.4: Connect the coupling E (28) with the upper end face of the upper torque meter (23), and use bolt H (25) and nut B (24) to fasten it.

[0073] Step 4.5: Lift the assembled rotor onto the dial indicator platform and place it horizontally. The positions of the two support points are at the positions of the radial bearing and the inner rings of the rolling bearings on the loader shaft.

[0074] Step 4.6: Measure the rotor runout and eccentricity, with the requirement that the standard is within 0.05 mm.

[0075] Step 4.7: If the measured parameters exceed the standard, correct the non-compliant parts by manual adjustment or machining until all parameters of the rotor sub-assembly are qualified.

[0076] Step 4.8: Install positioning pins at the parts connected by each coupling, namely positioning pin A (15), positioning pin G (137), positioning pin E (128), and positioning pin F (129), to ensure that the installation positions of each mating part remain unchanged during each assembly.

[0077] Step 4.9: Place the rotor horizontally on the dynamic balancing machine, fix the stator components of the upper and lower torque meters, perform G1.0 class dynamic balancing on the bearing rotor, and remove weights from the bearing thrust plate (56) and the loader thrust plate (37).

[0078] Step 4.10: Disassemble the rotor, remove bolts D (10), bolt E (14), and bolt a (22), and disassemble the connected coupling A (42) and coupling a (11), coupling B (75) and coupling b (13), and coupling C (21) and the upper torque meter (23).

[0079] Step 4.11: Place the disassembled radial bearing rotor components and torque meter rotor components on the corresponding benches.

[0080] Step 4.12: Remove the nut (77), and sequentially remove the shaft head flange (76) and coupling B (75) from the pump shaft (62).

[0081] Step 4.13: Remove nut D (43), and remove coupling A (42) from the loader shaft (44).

[0082] Optionally, step 5 specifically includes:

[0083] Step 5.1: Reinstall the outer ring of the rolling bearing A (30) onto the bearing housing (32), and reinstall the bearing gland A (31) onto the bearing housing (32) and fix it.

[0084] Step 5.2: Flip the loader housing (51) to the back side up, reinstall the bearing housing (32) onto the housing (51), and fix it with bolt J (33).

[0085] Step 5.3: Flip the loader housing (51) to the front side up, reinstall the lower bearing seat (35) into the loader housing (51), and tighten it with bolt N (50), and reinstall it paying attention to aligning the oil inlet hole.

[0086] Step 5.4: Reinstall the seal ring A (34) and seal ring B (49) into the lower bearing seat (35), and reinstall the lower bearing (36) into the lower bearing seat (35).

[0087] Step 5.5: Reinstall the loader rotor (136) without the coupling A (42) into the loader housing (51), and make the lower end face of the loader thrust disk (37) closely contact with the lower bearing bush (36);

[0088] Step 5.6: Horizontally place the loader upper cover (41) upward, reinstall the outer ring of the rolling bearing B (47) to the corresponding position of the loader upper cover (41), reinstall the bearing gland B (45), and fasten it with the bolt L (46);

[0089] Step 5.7: Flip the loader upper cover (41) to the back upward, reinstall the upper bearing bush seat (40) to the corresponding position of the loader upper cover (41), and fasten it with the bolt K (39);

[0090] Step 5.8: Reinstall the seal ring A (34) and the seal ring B (49) into the upper bearing bush seat (40), and reinstall the upper bearing bush (38) into the upper bearing bush seat (40);

[0091] Step 5.9: Flip the loader upper cover (41) with the upper bearing bush installed to the front upward, and reinstall it into the loader housing (51), and fasten it with the bolt M (48);

[0092] Step 5.10: Reinstall the coupling A (42) onto the loader shaft (44), and fasten it with the nut D (43).

[0093] Optionally, step 6 specifically includes:

[0094] Step 6.1: Reinstall the thrust bearing bush pressing plate (124) on one side of the thrust bearing bush base (122), and fasten it with the screw C (120);

[0095] Step 6.2: Reinstall the thrust bearing bush block (121) and the rubber rope (123) onto the thrust bearing bush base (122), and reinstall the thrust bearing bush pressing plate (124) on the other side, and fasten it with the screw C (120);

[0096] Step 6.3: Reinstall the balance weight base (118) to the corresponding position inside the tile disk base (117), and pay attention to preventing jamming during reinstallation;

[0097] Step 6.4: Reinstall the lower balance weight (119) onto the balance weight base (118) according to the mark;

[0098] Step 6.5: Reinstall the upper balance weight (116) onto the lower balance weight (119) according to the mark, and pay attention to handling it gently during reinstallation;

[0099] Step 6.6: Install the thrust bearing unit composed of the thrust bearing pedestal (122) and the thrust bearing pads (121) back to the corresponding positions on the upper balance weight (116) according to the marks;

[0100] Step 6.7: Install the thrust disc retaining ring (127) back onto the bearing pedestal (117) and fasten it with bolts Z (127).

[0101] Optionally, Step 7 specifically includes:

[0102] Step 7.1: Place the bearing housing (18) on the maintenance box and level it with a spirit level;

[0103] Step 7.2: Install the bushing (73) back into the bearing housing (18) and fasten it with screws B (74);

[0104] Step 7.3: Install the sealing ring C (79) and the lower machine seal stator unit (72) into the bearing housing (18) in sequence and fasten them with bolts Q (71);

[0105] Step 7.4: Install the screw pump stator (80) back into the bearing housing (18) and fasten it with bolts R (81);

[0106] Step 7.5: Install the spring compensating pad (53) back into the bearing housing (18), noting that the positioning holes of the compensating pad are aligned with the positioning pins D (70);

[0107] Step 7.6: Install the lower thrust disc (54) back into the bearing housing (18);

[0108] Step 7.7: Install the radial thrust bearing rotor without the coupling back into the bearing housing (18) so that the lower panel (55) of its tile surface contacts the tile surface of the lower thrust disc (54);

[0109] Step 7.8: Flip the upper thrust disc (67) with the tile surface facing down, install the adjusting shim (66), and fasten it with screws A (59);

[0110] Step 7.9: Install the upper thrust disc (67) back into the bearing housing (18) so that the tile surface of the upper thrust disc (67) contacts the tile surface of the upper panel (68);

[0111] Step 7.10: Install the bearing upper cover (63) back into the bearing housing (18). When installing, note that the positioning pin C (58) on the bearing upper cover (63) is aligned with the positioning hole of the upper thrust disc (67), and fasten it with stud bolts A (65) and nuts F (64);

[0112] Step 7.11: Reinstall the radial bearing (61) onto the bearing upper cover (63), and fasten it with bolt O (60);

[0113] Step 7.12: Use the radial thrust bearing centering device (125) to adjust the clearances around the radial bearing evenly. After the adjustment is completed, tighten the adjusting rod (132) to fix the relative positions of the rotor and stator in the bearing chamber;

[0114] Step 7.13: Reinstall the stud bolt C (78), coupling B (75), and shaft head flange (76) onto the pump shaft (62) in sequence, and fasten them with nuts (77).

[0115] Optionally, step 8 specifically includes:

[0116] Step 8.1: Place the shaft seal top cover (20) with its back facing up;

[0117] Step 8.2: Reinstall the upper machine seal stator unit (100) onto the shaft seal top cover (20), and fasten it with bolt X (99);

[0118] Step 8.3: Flip the upper shaft seal top cover unit (137) to place it with its front facing up, waiting for reinstallation.

[0119] Optionally, step 9 specifically includes:

[0120] Step 9.1: Place the base (1) on the test site and level it with a level;

[0121] Step 9.2: Reinstall the loader (9) into the base (1), and fasten it with bolt C (8);

[0122] Step 9.3: Reinstall the lower torque meter (12), connect coupling a (11) with coupling A (42), install positioning pin A (15), and fasten it with bolt D (10);

[0123] Step 9.4: Reinstall the motor support base (3) onto the base (1), adjust the position of the motor support base (3) so that the lower torque meter coupling b (13) is at the center of the inner hole of the motor support base (3);

[0124] Step 9.5: Level the motor support base (3) with a level and fasten it with bolt A (2);

[0125] Step 9.6: Reinstall the radial thrust bearing (16) into the motor support base (3), connect coupling B (75) with coupling b (13), install positioning pin A (15), and fasten it with bolt E (14). At the same time, reinstall bolt F (17) and fasten it;

[0126] Step 9.7: When reinstalling bolts E (14) and bolts F (17), there must be no interference or stress. If there is any abnormality, adjust the position of the motor support (3);

[0127] Step 9.8: Remove the radial thrust bearing centering device (125) and re-measure the clearance around the radial bearing to ensure that it is uniform.

[0128] Step 9.9: Install the upper shaft cap unit (137) back onto the bearing upper cover (63) and tighten it with bolts G (19);

[0129] Step 9.10: Reinstall coupling C (21) onto the pump shaft (62);

[0130] Step 9.11: Reinstall the upper torque meter (23), connect its lower end surface to the coupling C (21), and tighten it with bolt a (22);

[0131] Step 9.12: Connect the motor bracket (6) to the motor (7) and tighten them with bolts b (130);

[0132] Step 9.13: Reinstall the connected motor bracket (6) and motor (7) onto the motor support base (3) and reinstall bolt B (5);

[0133] Step 9.14: Align the coupling E (28) and the coupling e (29), and adjust the alignment data by matching the motor bracket (6) and the motor support base (3);

[0134] Step 9.15: After the alignment is completed, tighten bolt B (5), reinstall bolt I (26) and nut C (27) and tighten.

[0135] The beneficial technical effects of this application are:

[0136] 1) A nuclear power plant main pump thrust bearing test bench and an assembly method thereof provided in the embodiment of the present application can effectively guide the assembly work of the test bench, complete the assembly of the test bench, and ensure the smooth progress of the localization bench test of the main pump bearing;

[0137] 2) A nuclear power plant main pump thrust bearing test bench and an assembly method thereof provided in an embodiment of the present application solidify the standard assembly process and modularize the assembly method, thereby reducing the workload of repeated assembly and improving work efficiency;

[0138] 3) A nuclear power plant main pump thrust bearing test bench and assembly method thereof provided in the embodiment of the present application, after the first assembly is completed, no rotor minor assembly work is required in the subsequent disassembly and assembly process, which reduces the workload of the later assembly and saves working time;

[0139] 4) The test bench and its assembly method for the thrust bearing of the main pump in a nuclear power plant provided by the embodiments of the present application install positioning pins at the connection and mating parts of the segmented rotors of each module to ensure that the relative positions of the rotor components remain unchanged after each reinstallation, improving the working quality of the assembly;

[0140] 5) The test bench and its assembly method for the thrust bearing of the main pump in a nuclear power plant provided by the embodiments of the present application design and manufacture a centering device for the bearing rotor to ensure that the rotor is fixed at the center of the stator when the bearing housing is reinstalled as a whole, avoiding repeatedly adjusting the rotor center after the bearing housing is reinstalled as a whole, optimizing the assembly process, and improving the assembly efficiency and working quality. Description of the Drawings

[0141] Figure 1 It is a schematic structural diagram of the upper panel in the test bench for the thrust bearing of the main pump in a nuclear power plant provided by the embodiments of the present application;

[0142] Figure 2 It is a schematic structural diagram of the lower panel in the test bench for the thrust bearing of the main pump in a nuclear power plant provided by the embodiments of the present application;

[0143] Figure 3 It is a schematic structural diagram of the radial thrust bearing rotor in the test bench for the thrust bearing of the main pump in a nuclear power plant provided by the embodiments of the present application;

[0144] Figure 4 It is a schematic structural diagram of the loader rotor in the test bench for the thrust bearing of the main pump in a nuclear power plant provided by the embodiments of the present application;

[0145] Figure 5 It is a schematic structural diagram of the minor assembly of the rotor in the test bench for the thrust bearing of the main pump in a nuclear power plant provided by the embodiments of the present application;

[0146] Figure 6 It is a schematic structural diagram of the loader in the test bench for the thrust bearing of the main pump in a nuclear power plant provided by the embodiments of the present application;

[0147] Figure 7 It is a schematic structural diagram of the thrust bearing disc in the test bench for the thrust bearing of the main pump in a nuclear power plant provided by the embodiments of the present application;

[0148] Figure 8 It is a partial schematic structural diagram of the thrust bearing disc in the test bench for the thrust bearing of the main pump in a nuclear power plant provided by the embodiments of the present application;

[0149] Figure 9 : It is a schematic structural diagram of the radial thrust bearing in the assembly method of the water-lubricated thrust bearing test bench for the million-kilowatt nuclear main pump provided by the present invention;

[0150] Figure 10a and Figure 10bSchematic structural diagram of a radial thrust bearing rotor alignment device in a main pump thrust bearing test bench for a nuclear power plant provided by an embodiment of the present application;

[0151] Figure 11 Schematic structural diagram of an upper shaft sealing cover unit in a main pump thrust bearing test bench for a nuclear power plant provided by an embodiment of the present application;

[0152] Figure 12 Schematic structural diagram of a main pump thrust bearing test bench for a nuclear power plant provided by an embodiment of the present application.

[0153] In the figure:

[0154] 1 - Base; 2 - Bolt A; 3 - Motor support seat; 4 - Nut A; 5 - Bolt B; 6 - Motor bracket; 7 - Motor; 8 - Bolt C; 9 - Loader; 10 - Bolt D; 11 - Coupling a; 12 - Lower torque meter; 13 - Coupling b; 14 - Bolt E; 15 - Locating pin A; 16 - Radial thrust bearing; 17 - Bolt F; 18 - Bearing housing shell; 19 - Bolt G; 20 - Shaft capping cover; 21 - Coupling C; 22 Bolt a; 23 - Upper torque meter; 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 - Bearing seat; 33 - Bolt J; 34 - Seal ring A; 35 - Lower bearing pad; 36 - Lower bearing bush; 37 - Loader thrust disk; 38 - Upper bearing bush; 39 - Bolt K; 40 - Upper bearing pad; 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 - Loader housing; 52 - Nut E; 53 - Spring compensation pad; 54 - Lower thrust disk; 55 - Lower panel; 56 - Bearing thrust disk; 57 - Locating pin B; 58 - Locating pin C; 59 - Screw A; 60 - Bolt O; 61 - Radial bearing; 62 - Pump shaft; 63 - Bearing upper cover; 64 - Nut F; 65 - Stud A; 66 - Adjusting pad; 67 - Upper thrust disk; 68 - Upper panel; 69 - Bolt P; 70 - Locating pin D; 71 - Bolt Q; 72 - Lower mechanical seal stator unit; 73 - Bush; 74 - Screw B; 75 - Coupling B; 76 - Axle head flange; 77 - Nut; 78 - Stud B; 79 - Seal ring C; 80 - Threaded pump stator; 81 - Bolt R; 82 - Mechanical seal screw A; 83 - Mechanical seal pressing ring A; 84 - Mechanical seal rotating ring A; 85 - Seal ring D; 86 - Bolt S; 87 - Threaded pump rotor; 88 - Seal ring E; 89 - Bolt T; 90 - Bolt U; 91 - Inner sleeve of radial bearing; 92 - Mechanical seal screw B; 93 Mechanical seal pressing ring B; 94 - Nut G; 95 - Mechanical seal rotating ring B; 96 - Seal ring F; 97 - Bolt V; 98 - Bolt W; 99 - Bolt X; 100 - Upper mechanical seal stator unit; 101 - Outer pressing ring of upper panel; 102 - Large rubber ring of upper panel; 103 - Pad of upper panel; 104 - Small rubber ring of upper panel; 105 - Inner pressing ring of upper panel; 106 - Disk body of upper panel; 107 - Upper partition bar; 108 - Disk body of lower panel; 109 - Outer pressing ring of lower panel; 110 - Large rubber ring of lower panel; 111 - Pad of lower panel; 112 - Small rubber ring of lower panel; 113 - Inner pressing ring of lower panel; 114 - Bolt Y; 115 - Lower partition bar; 116 - Upper balance weight; 117 - Base of pad; 118 - Base of balance weight; 119 - Lower balance weight; 120 - Screw C; 121 - Thrust pad122 - Thrust bearing pedestal; 123 - Rubber rope; 124 - Thrust bearing pressure plate; 125 - Bearing rotor alignment device; 126 - Thrust disc retaining ring; 127 - Bolt Z; 128 - Locating pin E; 129 - Locating pin F; 130 - Bolt b; 131 - Fixed disc; 132 - Adjusting rod; 133 - Bolt c; 134 - Locating pin G; 135 - Radial thrust bearing rotor; 136 - Loader rotor; 137 - Upper shaft capping unit. Specific embodiments

[0155] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the embodiments described below are only a part of the embodiments of the present application, rather than all of them. Based on the embodiments described in the present application, all other embodiments obtained by those skilled in the art without creative efforts are within the scope of protection of the present application.

[0156] A nuclear power plant main pump thrust bearing test bench and its assembly method provided by the embodiments of the present application standardize the assembly process of the test bench, can effectively guide the assembly work of the test bench, and solve problems such as difficult assembly and alignment of multi-section shaft combined rotors through measures such as installing locating pins at the connection and mating parts of segmented rotors and designing and manufacturing bearing rotor alignment devices, ensure the assembly quality, and ensure the smooth progress of the domestic test bench test of the main pump shaft tile. At the same time, modularize the assembly method, reduce the workload of repeated assembly, and improve work efficiency.

[0157] Based on the above content, in order to clearly and detailedly illustrate the above advantages of the present application, the specific embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0158] See Figures 1 - 12 , a nuclear power plant main pump thrust bearing test bench provided by the embodiments of the present application includes: a base 1, a loader 9, a lower torque meter 12, a motor support seat 3, a radial thrust bearing 16, an upper torque meter 23, a motor bracket 6, and a motor 7;

[0159] Shells are provided between the base 1, the motor support seat 3, and the motor bracket 6; inside the shells, a loader 9, a lower torque meter 12, a radial thrust bearing 16, and an upper torque meter 23 are provided;

[0160] The loader 9 is fixed on the base 1, and the upper end is fixed to the lower end of the lower torque meter 12, and a first locating pin 15 is provided;

[0161] A radial thrust bearing 16 is fixed on the motor support base 3, and a first through hole is provided in the middle; the upper end of the lower torque meter 12 passes through the first through hole and is fixed to the lower end of the radial thrust bearing 16, and a second positioning pin 134 is provided; a test pad is fixed at the contact position between the stator of the radial thrust bearing 16 and the bearing rotor 135;

[0162] A second through hole is provided in the motor support 6, and the motor 7 is fixed to the motor support; the lower end of the upper torque meter 23 is fixed to the upper end of the radial thrust bearing 16, and a third positioning pin 128 is provided. The upper end of the upper torque meter 23 passes through the second through hole and is connected to the motor 7 through a coupling, and a fourth positioning pin 129 is provided.

[0163] It can be understood that since positioning pins have been installed on each rotor connection component to ensure that the position remains unchanged after each disassembly and reinstallation, there is no need to perform the small rotor assembly operation during the subsequent assembly process.

[0164] In some possible implementation manners of the embodiment of the present application, a rotor alignment device 125 is fixed to the upper end of the radial thrust bearing 16, which is used to prevent the relative position between the bearing rotor 135 and the stator from changing during the overall hoisting process of the radial thrust bearing 16.

[0165] It can be understood that the application of the radial thrust bearing alignment device 125 prevents the relative position between the rotor and the stator from changing during the overall hoisting process of the radial thrust bearing chamber, avoids repeatedly adjusting the rotor center after the overall reinstallation of the bearing chamber, optimizes the assembly process, and improves the assembly efficiency and work quality.

[0166] In some possible implementation manners 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; the rotor alignment device 125 includes: a fixing plate 131 and four adjusting rods 132;

[0167] The fixing plate 131 is of an annular structure, the bottom surface is fixed to 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 adjusting rods 132 are perpendicular to each other, one end is fixed to the fixing plate 131, and the other end is used to lock the position of the pump shaft 62.

[0168] In some possible implementation manners of the embodiment of the present application, the radial thrust bearing 16 further includes: a bearing thrust plate 56, an upper web panel 68, and a lower web panel 55;

[0169] The upper web panel 68 and the lower web panel 55 are respectively fixed to the upper and lower sides of the bearing thrust plate 56;

[0170] On the upper side of the upper web panel 68, an upper test pad 103 and an upper spacer 107 are arranged oppositely; on the lower side of the lower web panel 55, a lower test pad 111 and a lower spacer 115 are arranged oppositely;

[0171] The upper side of the upper platen 68 and the lower side of the lower platen 55 are in contact with the stator of the radial thrust bearing 16.

[0172] In some possible implementation manners of the embodiment of the present application, the radial thrust bearing 16 further includes: a lower thrust disk 54, an upper thrust disk 67, and a bearing housing 18;

[0173] The lower thrust disk 54 is fixed inside the bearing housing 18, and the tile surface of the lower platen 55 is in contact with the tile surface of the lower thrust disk 54;

[0174] The upper thrust disk 67 is fixed inside the bearing housing 18, and the tile surface of the upper thrust disk 67 is in contact with the tile surface of the upper platen 68.

[0175] In some possible implementation manners of the embodiment of the present application, the lower thrust disk 54 or the upper thrust disk 67 includes: an upper balance weight 116, a tile disk base 117, a balance weight base 118, a lower balance weight 119, a thrust tile 121, a thrust tile base 122, and a thrust tile pressing plate 124;

[0176] The lower balance weight 119 is installed on the balance weight base 118, and the upper balance weight 116 is installed on the lower balance weight 119;

[0177] The thrust tile base 122 and the thrust tile 121 form a thrust tile unit and are installed at corresponding positions on the upper balance weight 116; the thrust tile pressing plates 124 are installed on both sides of the thrust tile base 122.

[0178] In some possible implementation manners of the embodiment of the present application, the loader 9 includes: a loader rotor 136 and a loader housing 51;

[0179] The lower coupling a11 of the lower torque meter 12 is connected to the coupling A42 of the loader rotor 136;

[0180] The loader rotor 136 is installed inside the loader housing 51;

[0181] An upper tile 38 and a lower tile 36 are installed inside the loader housing 51, and the lower end surface of the loader thrust disk 37 on the loader rotor 136 is in close contact with the surface of the lower tile 36.

[0182] Based on a nuclear power plant main pump thrust bearing test bench provided by the above embodiment, the embodiment of the present application further provides a nuclear power plant main pump thrust bearing test bench assembly method, which is applied to any one of the nuclear power plant main pump thrust bearing test benches provided by the above embodiment.

[0183] The nuclear power plant main pump thrust bearing test bench assembly method provided by the embodiment of the present application includes:

[0184] Step 1: Assemble the web plate of the radial thrust bearing 16;

[0185] Step 2: Assemble the bearing rotor 135 of the radial thrust bearing 16;

[0186] Step 3: Assemble the loader rotor 136 of the loader 9;

[0187] Step 4: Conduct a minor assembly of the rotors, and connect the loader rotor 136, the bearing rotor 135, the lower torque meter 12, and the upper torque meter 23;

[0188] Step 5: Assemble the loader 9;

[0189] Step 6: Assemble the thrust collar of the radial thrust bearing 16;

[0190] Step 7: Assemble the bearing housing of the radial thrust bearing 16;

[0191] Step 8: Assemble the upper shaft capping unit;

[0192] Step 9: Conduct an overall assembly of the test bench.

[0193] The following is a detailed example to illustrate the specific assembly methods for each step:

[0194] Step 1: Assemble the web plate of the radial thrust bearing 16, specifically including:

[0195] Step 1.1: Assemble the upper web plate 68; as Figure 1 shown, Step 1.1 specifically includes:

[0196] Step 1.1.1: Reinstall the upper spacer bar 107 into the corresponding pin holes in the upper web plate body 106 in sequence;

[0197] Step 1.1.2: Reinstall the upper web plate pads 103 onto the upper web plate body 106, and record the pad numbers;

[0198] Step 1.1.3: Reinstall the upper web plate large rubber ring 102 and the upper web plate small rubber ring 104;

[0199] Step 1.1.4; Reinstall the upper web plate outer pressure ring 101 and the upper web plate inner pressure ring 105;

[0200] Step 1.1.5: Lift the entire web plate to a height of 200 mm, and install and lock two bolts V97 and bolts W98 diagonally at each corner;

[0201] Step 1.1.6: Flip the web plate over with the back facing up, and reinstall the remaining bolts V97 and bolts W98 in sequence, and tighten them using the cross-cross method.

[0202] Step 1.2: Assembly of the lower panel 55; As Figure 2 shown, Step 1.2 specifically includes:

[0203] Step 1.2.1: Reinstall the lower separating strip 115 into the corresponding pin holes in the lower panel body 108 according to the marks;

[0204] Step 1.2.2: Reinstall the lower panel tiles 111 onto the lower panel body 108 and record the tile numbers;

[0205] Step 1.2.3: Reinstall the large rubber ring 110 of the lower panel and the small rubber ring 112 of the upper panel;

[0206] Step 1.2.4: Reinstall the outer pressure ring 109 and the inner pressure ring 113 of the lower panel;

[0207] Step 1.2.5: Reinstall the bolt Y114 and tighten it using the cross-cross method.

[0208] As Figure 3 shown, Step 2: Assemble the bearing rotor 135 of the radial thrust bearing 16, specifically including:

[0209] Step 2.1: Support the bearing thrust plate 56 upright on the maintenance box and level it using a spirit level;

[0210] Step 2.2: Reinstall the inner sleeve 91 of the radial bearing onto the bearing thrust plate 56 and tighten it using the bolt T90;

[0211] Step 2.3: Reinstall the upper panel 68 onto the bearing thrust plate 56 and tighten it using the bolt P69;

[0212] Step 2.4: Reinstall the sealing ring F96, the mechanical seal dynamic ring B95, and the mechanical seal pressure ring B93 in sequence and tighten them using the mechanical seal screw B92;

[0213] Step 2.5: Use a crane to flip the bearing thrust plate 56 so that the back of the bearing thrust plate 56 is supported upright on the maintenance box and level it using a spirit level;

[0214] Step 2.6: Reinstall the lower panel 55 onto the bearing thrust plate 56 and tighten it using the bolt S89;

[0215] Step 2.7: Reinstall the sealing ring E88, and reinstall the screw pump rotor 87 onto the bearing thrust plate 56 and tighten it using the bolt R86;

[0216] Step 2.8: Reinstall the sealing ring D85, the mechanical seal dynamic ring A84, and the mechanical seal pressure ring A83 in sequence and tighten them using the mechanical seal screw A82;

[0217] Step 2.9: Use a crane to stand up the pump shaft 62;

[0218] Step 2.10: Use a crane to turn the bearing thrust disk 56 with its front side facing up, then slowly install the standing pump shaft 62 into the hole of the thrust disk 56 and make it rest against, and use nut G94 for fastening;

[0219] Step 2.11: Install the stud bolt B78, coupling B75, and shaft head flange 76 onto the pump shaft 62 in sequence, and use nut 77 for fastening.

[0220] As Figure 4 shown, Step 3: Assemble the loader rotor 136 of the loader 9, specifically including:

[0221] Step 3.1: Install the inner rings of the rolling bearing A30 and the rolling bearing B47 onto the corresponding positions on the loader shaft 44 respectively;

[0222] Step 3.2: Place the loader thrust disk 37 on a special maintenance bench, and install the loader shaft 44 into the central hole of the loader thrust disk 37, and use nut E52 for fastening;

[0223] Step 3.3: Install the coupling A42 onto the loader shaft 44, and use nut D43 for fastening.

[0224] As Figure 5 shown, Step 4: Conduct a minor assembly of the rotor, connect the loader rotor 136, the bearing rotor 135, the lower torque meter 12, and the upper torque meter 23, specifically including:

[0225] Step 4.1: Connect the lower coupling a11 of the lower torque meter 12 with the coupling A42 of the loader rotor 136, and use bolt D10 for fastening;

[0226] Step 4.2: Connect the coupling B75 of the radial thrust bearing rotor 135 with the upper coupling b13 of the lower torque meter 12, and use bolt E14 for fastening;

[0227] Step 4.3: Install the coupling C21 back onto the pump shaft 62, and connect the lower end face of the upper torque meter 23 with the coupling C21, and use bolt a22 for fastening;

[0228] Step 4.4: Connect the coupling E28 with the upper end face of the upper torque meter 23, and use bolt H25 and nut B24 for fastening;

[0229] Step 4.5: Lift the assembled rotor onto the dial indicator platform and place it horizontally. The positions of the two support points are at the positions of the radial bearing and the inner ring of the rolling bearing on the loader shaft.

[0230] Step 4.6: Measure the deflection and runout of the rotor, with the requirement that the standard is within 0.05 mm;

[0231] Step 4.7: If the measured parameters exceed the standard, correct the parts that exceed the standard by manual adjustment or machining until all parameters of the rotor sub-assembly are qualified;

[0232] Step 4.8: Install positioning pins at the parts connected by each coupling, namely positioning pin A15, positioning pin G137, positioning pin E128, and positioning pin F129, to ensure that the installation positions of the mating parts remain unchanged during each assembly;

[0233] Step 4.9: Place the rotor horizontally on the dynamic balancing machine, fix the stator components of the upper and lower torque meters, perform dynamic balancing on the bearing rotor with a G1.0 class quality, and remove weights from the bearing thrust disc 56 and the loader thrust disc 37;

[0234] Step 4.10: Disassemble the rotor, remove bolts D10, bolt E14, and bolt a22, and disassemble the connected couplings A42 and a11, couplings B75 and b13, and couplings C21 and the upper torque meter 23;

[0235] Step 4.11: Place the disassembled radial bearing rotor components and torque meter rotor components on the corresponding benches;

[0236] Step 4.12: Remove nut 77, and sequentially remove the shaft head flange 76 and coupling B75 from the pump shaft 62;

[0237] Step 4.13: Remove nut D43 and remove coupling A42 from the loader shaft 44.

[0238] Since positioning pins have been installed on the connecting parts of each rotor to ensure that the installation positions remain unchanged after each disassembly, there is no need to perform rotor sub-assembly operations during subsequent assembly processes.

[0239] As Figure 6 shown, Step 5: Assemble the loader 9, which specifically includes:

[0240] Step 5.1: Reinstall the outer ring of the rolling bearing A30 onto the bearing housing 32, and reinstall the bearing gland A31 onto the bearing housing 32 and fix it;

[0241] Step 5.2: Flip the loader housing 51 to the back side up, reinstall the bearing housing 32 onto the housing 51, and fix it with bolts J33;

[0242] Step 5.3: Flip the loader housing 51 to the front side up, reinstall the lower bearing seat 35 into the loader housing 51, and tighten it with bolts N50, taking care to align the oil inlet hole during reinstallation;

[0243] Step 5.4: Reinstall the sealing ring A34 and the sealing ring B49 into the lower bearing housing 35, and reinstall the lower bearing 36 into the lower bearing housing 35;

[0244] Step 5.5: Reinstall the loader rotor 136 without the coupling A42 into the loader housing 51, and make the lower end face of the loader thrust disk 37 closely contact with the surface of the lower bearing 36;

[0245] Step 5.6: Place the loader upper cover 41 horizontally upward, reinstall the outer ring of the rolling bearing B47 to the corresponding position on the loader upper cover 41, reinstall the bearing gland B45, and fasten it with the bolt L46;

[0246] Step 5.7: Flip the loader upper cover 41 to the back side upward, reinstall the upper bearing housing 40 to the corresponding position on the loader upper cover 41, and fasten it with the bolt K39;

[0247] Step 5.8: Reinstall the sealing ring A34 and the sealing ring B49 into the upper bearing housing 40, and reinstall the upper bearing 38 into the upper bearing housing 40;

[0248] Step 5.9: Flip the loader upper cover 41 with the upper bearing installed to the front side upward, and reinstall it into the loader housing 51, and fasten it with the bolt M48;

[0249] Step 5.10: Reinstall the coupling A42 onto the loader shaft 44, and fasten it with the nut D43.

[0250] As Figure 7 、 8 shown, Step 6: Assembling the thrust disk of the radial thrust bearing 16 includes a lower thrust disk 54 and an upper thrust disk 67, specifically including:

[0251] Step 6.1: Reinstall the thrust bearing pressure plate 124 on one side of the thrust bearing base 122, and fasten it with the screw C120;

[0252] Step 6.2: Reinstall the thrust bearing block 121 and the rubber rope 123 onto the thrust bearing base 122, and reinstall the thrust bearing pressure plate 124 on the other side, and fasten it with the screw C120;

[0253] Step 6.3: Reinstall the balance block base 118 to the corresponding position in the disk base 117, and pay attention to preventing jamming during reinstallation;

[0254] Step 6.4: Reinstall the lower balance block 119 onto the balance block base 118 according to the mark;

[0255] Step 6.5: Reinstall the upper balance block 116 onto the lower balance block 119 according to the mark, and pay attention to handling it gently during reinstallation;

[0256] Step 6.6: Reassemble the thrust bearing unit composed of the thrust bearing pedestal 122 and the thrust bearing pads 121 to the corresponding position of the upper balance weight 116 according to the marks.

[0257] Step 6.7: Reassemble the thrust disc retaining ring 127 to the bearing pedestal 117 and fasten it with bolts Z127.

[0258] As Figure 9 shown, Step 7: Assemble the bearing housing of the radial thrust bearing 16;

[0259] Step 7.1: Place the bearing housing shell 18 on the maintenance square box and level it with a spirit level.

[0260] Step 7.2: Reassemble the bushing 73 into the bearing housing shell 18 and fasten it with screws B74.

[0261] Step 7.3: Reassemble the sealing ring C79 and the lower machine seal stator unit 72 into the bearing housing shell 18 in sequence and fasten them with bolts Q71.

[0262] Step 7.4: Reassemble the screw pump stator 80 into the bearing housing shell 18 and fasten it with bolts R81.

[0263] Step 7.5: Reassemble the spring compensating pad 53 into the bearing housing shell 18, noting that the positioning holes of the compensating pad are aligned with the positioning pins D70.

[0264] Step 7.6: Reassemble the lower thrust disc 54 into the bearing housing shell 18.

[0265] Step 7.7: Reassemble the radial thrust bearing rotor without coupling into the bearing housing shell 18 so that the lower panel 55 of its bearing surface contacts the bearing surface of the lower thrust disc 54.

[0266] Step 7.8: Flip the upper thrust disc 67 with its bearing surface facing down, reassemble the adjusting shim 66 and fasten it with screws A59.

[0267] Step 7.9: Reassemble the upper thrust disc 67 into the bearing housing shell 18 so that the bearing surface of the upper thrust disc 67 contacts the bearing surface of the upper panel 68.

[0268] Step 7.10: Reassemble the bearing upper cover 63 into the bearing housing shell 18. When reassembling, note that the positioning pin C58 on the bearing upper cover 63 is aligned with the positioning hole of the upper thrust disc 67, and fasten it with stud bolts A65 and nuts F64.

[0269] Step 7.11: Reassemble the radial bearing 61 onto the bearing upper cover 63 and fasten it with bolts O60.

[0270] Step 7.12: Use the radial thrust bearing alignment device 125 to adjust the clearances around the radial bearing evenly Figure 10a and Figure 10b as shown. After the adjustment is completed, tighten the adjusting rod 132 to fix the relative positions of the rotor and stator in the bearing housing;

[0271] Step 7.13: Install the stud bolts C78, coupling B75, and shaft head flange 76 onto the pump shaft 62 in sequence, and tighten them with nuts 77.

[0272] The application of the radial thrust bearing alignment device 125 prevents the relative positions of the rotor and stator from changing during the overall hoisting of the radial thrust bearing housing, avoids repeatedly adjusting the rotor center after the overall reinstallation of the bearing housing, optimizes the assembly process, and improves the assembly efficiency and working quality;

[0273] As Figure 11 shown, Step 8: Assemble the upper shaft sealing cover unit, specifically including:

[0274] Step 8.1: Place the shaft sealing cover 20 with its back facing up;

[0275] Step 8.2: Reinstall the upper machine seal stator unit 100 onto the shaft sealing cover 20, and tighten it with bolts X99;

[0276] Step 8.3: Flip the upper shaft sealing cover unit 137 to place it with its front facing up, waiting for reinstallation.

[0277] As Figure 12 shown, Step 9: Overall assembly of the test bench, specifically including:

[0278] Step 9.1: Place the base 1 on the test site and level it with a spirit level;

[0279] Step 9.2: Reinstall the loader 9 into the base 1 and tighten it with bolts C8;

[0280] Step 9.3: Reinstall the lower torque meter 12, connect the coupling a11 with the coupling A42, install the positioning pin A15, and tighten it with bolts D10;

[0281] Step 9.4: Reinstall the motor support base 3 onto the base 1, adjust the position of the motor support base 3 so that the lower torque meter coupling b13 is at the center of the inner hole of the motor support base 3;

[0282] Step 9.5 Level the motor support base 3 with a spirit level and tighten it with bolts A2;

[0283] Step 9.6: Reinstall the radial thrust bearing 16 into the motor support seat 3, connect the coupling B75 with the coupling b13, install the positioning pin A15, and tighten it with the bolt E14, and reinstall the bolt F17 and tighten it;

[0284] Step 9.7: When reinstalling bolts E14 and F17, there should be no interference or stress. If there is any abnormality, adjust the position of the motor support 3;

[0285] Step 9.8: Disassemble the radial thrust bearing centering device 125 and re-measure the clearance around the radial bearing to ensure that it is uniform;

[0286] Step 9.9: Reinstall the upper shaft capping cover unit 137 onto the bearing upper cover 63 and tighten it with bolts G19;

[0287] Step 9.10: Reinstall coupling C21 onto pump shaft 62;

[0288] Step 9.11: Reinstall the upper torque meter 23, connect its lower end surface to the coupling C21, and tighten it with bolts a22;

[0289] Step 9.12: Connect the motor bracket 6 to the motor 7 and tighten them with bolts b130;

[0290] Step 9.13: Reinstall the connected motor bracket 6 and motor 7 onto the motor support base 3, and reinstall the bolt B5;

[0291] Step 9.14: Align the coupling E28 and the coupling e29, and adjust the alignment data by matching the motor bracket 6 with the motor support seat 3;

[0292] Step 9.15: After the alignment is completed, tighten the bolt B5, reinstall the bolt I26 and nut C27 and tighten them.

[0293] The embodiment of the present application provides a method for assembling a test bench for the thrust bearing of the main pump of a nuclear power plant. The assembly method is modularized, and the corresponding steps can be directly extracted to guide the assembly work of the test bench. It is simple and clear, and a number of special tools are designed and manufactured for the assembly process of the test bench to optimize the assembly process. In addition, during the test process, in order to check the disassembly and assembly operation of the domestic bearing shell in the running state, it is not necessary to replace the parts under normal circumstances. Therefore, in the subsequent disassembly and assembly operation, it is not necessary to disassemble the radial thrust bearing rotor and the loader rotor, and in the first assembly process, the positioning pins have been added to the matching connection positions of each section of the rotor to ensure that the relative positions of the rotor components remain unchanged after each reassembly, and there is no need to perform small assembly operations of the rotor in the future.

[0294] The present application has been described in detail above with reference to the accompanying drawings and embodiments. However, the present application is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present application within the knowledge of those of ordinary skill in the art. The content not described in detail in the present application can all adopt the prior art.

Claims

1. A test bench for the thrust bearing of the main pump of a nuclear power plant, characterized in that, The test bench includes: a base (1), a loader (9), a lower torque meter (12), a motor support (3), a radial thrust bearing (16), an upper torque meter (23), a motor bracket (6), and a motor (7); Housings are provided between the base (1), the motor support (3), and the motor bracket (6); inside the housings are provided the loader (9), the lower torque meter (12), the radial thrust bearing (16), and the upper torque meter (23); The loader (9) is fixed on the base (1), and the upper end of the loader (9) is fixed to the lower end of the lower torque meter (12), and a first positioning pin (15) is provided; The radial thrust bearing (16) is fixed on the motor support (3), and a first through hole is formed in the middle; the upper end of the lower torque meter (12) passes through the first through hole and is fixed to the lower end of the radial thrust bearing (16), and a second positioning pin (134) is provided; a test tile is fixed at the contact position between the stator of the radial thrust bearing (16) and the radial thrust bearing rotor (135); A second through hole is formed in the motor bracket (6), and the motor (7) is fixed to the motor bracket; the lower end of the upper torque meter (23) is fixed to the upper end of the radial thrust bearing (16), and a third positioning pin (128) is provided. The upper end of the upper torque meter (23) passes through the second through hole and is connected to the motor (7) through a coupling, and a fourth positioning pin (129) is provided; An bearing rotor centering device (125) is fixed to the upper end of the radial thrust bearing (16) to prevent the relative position between the radial thrust bearing rotor (135) and the stator from changing during the overall hoisting process of the radial thrust bearing (16); The radial thrust 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); the bearing rotor centering device (125) includes: a fixed disk (131) and four adjusting rods (132); The fixed disk (131) is of an annular structure, the bottom surface of which is fixed to 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 adjusting rods (132) are perpendicular to each other, one end of which is fixed to the fixed disk (131), and the other end is used to lock the position of the pump shaft (62).

2. The test bench for the thrust bearing of the main pump of a nuclear power plant according to claim 1, characterized in that, The radial thrust bearing (16) further includes: a bearing thrust disk (56), an upper web panel (68), and a lower web panel (55); The upper web panel (68) and the lower web panel (55) are respectively fixed to the upper and lower sides of the bearing thrust disk (56); On the upper side of the upper web panel (68), oppositely arranged upper web panel tiles (103) and upper dividing strips (107) are installed; on the lower side of the lower web panel (55), oppositely arranged lower web panel tiles (111) and lower dividing strips (115) are installed; The upper side of the upper web panel (68) and the lower side of the lower web panel (55) are in contact with the stator of the radial thrust bearing (16).

3. The main pump thrust bearing test bench of a nuclear power plant according to claim 2, characterized in that The radial thrust bearing (16) further includes: a lower thrust disk (54), an upper thrust disk (67), and a bearing housing (18); The lower thrust disk (54) is fixed inside the bearing housing (18), and the tile surface of the lower panel (55) is in contact with the tile surface of the lower thrust disk (54); The upper thrust disk (67) is fixed inside the bearing housing (18), and the tile surface of the upper thrust disk (67) is in contact with the tile surface of the upper panel (68).

4. The main pump thrust bearing test stand of a nuclear power plant according to claim 3, characterized in that, The lower thrust disk (54) or the upper thrust disk (67) includes: an upper balance weight (116), a tile disk base (117), a balance weight base (118), a lower balance weight (119), a thrust tile (121), a thrust tile base (122), and a thrust tile pressing plate (124); The lower balance weight (119) is installed on the balance weight base (118), and the upper balance weight (116) is installed on the lower balance weight (119); The thrust tile base (122) and the thrust tile (121) form a thrust tile unit and are installed at corresponding positions on the upper balance weight (116); the thrust tile pressing plates (124) are installed on both sides of the thrust tile base (122).

5. The main pump thrust bearing test bench for nuclear power plants according to any one of claims 1-4, characterized in that, 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 to the coupling A (42) of the loader rotor (136); The loader rotor (136) is installed inside the loader housing (51); An upper tile (38) and a lower tile (36) are installed inside the loader housing (51), and the lower end face of the loader thrust disk (37) on the loader rotor (136) is in close contact with the surface of the lower tile (36).

6. An assembly method for a thrust bearing test bench of a main pump in a nuclear power plant, characterized in that, Applied to the main pump thrust bearing test bench of a nuclear power plant according to any one of claims 1-5; the method includes: Step 1: Assemble the panel of the radial thrust bearing (16); Step 2: Assemble the radial thrust bearing rotor (135) of the radial thrust bearing (16); Step 3: Assemble the loader rotor (136) of the loader (9); Step 4: Conduct a small rotor assembly, connecting the loader rotor (136), the radial thrust bearing rotor (135), the lower torque meter (12), and the upper torque meter (23); Step 5: Assemble the loader (9); Step 6: Assemble the thrust tile disk of the radial thrust bearing (16); Step 7: Assemble the bearing housing of the radial thrust bearing (16); Step 8: Assemble the upper shaft sealing cover unit; Step 9: Conduct an overall assembly of the test bench.

7. The assembly method of the thrust bearing test bench for the main pump of a nuclear power plant according to claim 6, characterized in that, The specific content of Step 1 includes: Step 1.1: Assemble the upper panel (68); Step 1.1 specifically includes: Step 1.1.1: Reinstall the upper partition strip (107) in sequence into the corresponding pin holes in the upper panel disk body (106); Step 1.1.2: Reinstall the upper panel tiles (103) onto the upper panel disk body (106) and record the tile numbers; Step 1.1.3: Reinstall the large rubber ring (102) and small rubber ring (104) of the upper panel. Step 1.1.4: Reinstall the outer pressure ring (101) and inner pressure ring (105) of the upper panel. Step 1.1.5: Lift the entire panel 200 mm, and install two bolts V (97) and bolts W (98) diagonally and lock them. Step 1.1.6: Turn the panel over with the back facing up, reinstall the remaining bolts V (97) and bolts W (98) in sequence, and tighten them using the cross-cross method. Step 1.2: Assembly of the lower panel (55); Step 1.2 specifically includes: Step 1.2.1: Reinstall the lower partition strip (115) into the corresponding pin holes in the lower panel body (108) according to the marks. Step 1.2.2: Reinstall the lower panel tiles (111) onto the lower panel body (108), and record the tile numbers. Step 1.2.3: Reinstall the large rubber ring (110) and small rubber ring (112) of the lower panel. Step 1.2.4: Reinstall the outer pressure ring (109) and inner pressure ring (113) of the lower panel. Step 1.2.5: Reinstall bolt Y (114), and tighten it using the cross-cross method.

8. The assembly method of the thrust bearing test bench for the main pump of a nuclear power plant according to claim 6, characterized in that, The said Step 2 specifically includes: Step 2.1: Support the bearing thrust disk (56) upright on the maintenance square box, and level it using a level. Step 2.2: Reinstall the radial bearing inner sleeve (91) onto the bearing thrust disk (56), and tighten it using bolt T (90). Step 2.3: Reinstall the upper panel (68) onto the bearing thrust disk (56), and tighten it using bolt P (69). Step 2.4: Reinstall the sealing ring F (96), mechanical seal dynamic ring B (95), and mechanical seal pressure ring B (93) in sequence, and tighten them using mechanical seal screw B (92). Step 2.5: Use a crane to turn the bearing thrust disk (56) over so that the back of the bearing thrust disk (56) is supported on the maintenance square box, and level it using a level. Step 2.6: Reinstall the lower panel (55) onto the bearing thrust disk (56), and tighten it using bolt S (89). Step 2.7: Reinstall the sealing ring E (88), and reinstall the screw pump rotor (87) onto the bearing thrust disk (56), and tighten it using bolt S (86). Step 2.8: Reinstall the sealing ring D (85), mechanical seal dynamic ring A (84), and mechanical seal pressure ring A (83) in sequence, and tighten them using mechanical seal screw A (82). Step 2.9: Use a crane to stand up the pump shaft (62). Step 2.10: Use a crane to turn the bearing thrust disk (56) upright, then slowly insert the standing pump shaft (62) into the hole of the bearing thrust disk (56) and seat it, and tighten it using nut G (94). Step 2.11: Reinstall the stud bolt B (78), coupling B (75), and shaft head flange (76) onto the pump shaft (62) in sequence, and tighten them using the nut (77).

9. The assembly method of the thrust bearing test bench for the main pump of a nuclear power plant according to claim 6, characterized in that, The said Step 3 specifically includes: Step 3.1: Reinstall the inner rings of the rolling bearing A (30) and the rolling bearing B (47) to their corresponding positions on the loader shaft (44). Step 3.2: Place the loader thrust disk (37) on a dedicated maintenance bench, install the loader shaft (44) into the central hole of the loader thrust disk (37), and fasten it with nut E (52). Step 3.3: Install the coupling A (42) on the loader shaft (44) and fasten it with nut D (43).

10. The assembly method of the thrust bearing test bench for the main pump of a nuclear power plant according to claim 6, wherein, The specific steps of step 4 include: Step 4.1: Connect the lower coupling a (11) of the lower torque meter (12) to the coupling A (42) of the loader rotor (136) and fasten it with bolt D (10). Step 4.2: Connect the coupling B (75) of the radial thrust bearing rotor (135) to the upper coupling b (13) of the lower torque meter (12) and fasten it with bolt E (14). Step 4.3: Reinstall the coupling C (21) on the pump shaft (62), connect the lower end face of the upper torque meter (23) to the coupling C (21), and fasten it with bolt a (22). Step 4.4: Connect the coupling E (28) to the upper end face of the upper torque meter (23) and fasten it with bolt H (25) and nut B (24). Step 4.5: Lift the assembled rotor onto the dial indicator platform and place it horizontally. The positions of the two support points are at the positions of the inner rings of the rolling bearings on the radial bearings and the loader shaft. Step 4.6: Measure the rotor's runout and eccentricity, with the requirement that the standard is within 0.05 mm. Step 4.7: If the measured parameters exceed the standard, correct the exceeding parts by manual adjustment or machining until all the parameters of the rotor sub-assembly are qualified. Step 4.8: Install and configure positioning pins at the connected parts of each coupling, namely the first positioning pin (15), the second positioning pin (134), the third positioning pin (128), and the fourth positioning pin (129), to ensure that the installation positions of each mating part remain unchanged during each assembly. Step 4.9: Place the rotor horizontally on the dynamic balancing machine, fix the stator components of the upper and lower torque meters, perform G1.0 class quality dynamic balancing on the bearing rotor, and remove weights from the bearing thrust disk (56) and the loader thrust disk (37). Step 4.10: Disassemble the rotor, remove bolt D (10), bolt E (14), and bolt a (22), and disassemble the connected coupling A (42) from the lower coupling a (11), coupling B (75) from the coupling b (13), and coupling C (21) from the upper torque meter (23). Step 4.11: Place the disassembled radial bearing rotor components and torque meter rotor components on the corresponding benches. Step 4.12: Remove the nut (77), and sequentially remove the shaft head flange (76) and the coupling B (75) from the pump shaft (62). Step 4.13: Remove nut D (43) and remove the coupling A (42) from the loader shaft (44).

11. The assembly method of the main pump thrust bearing test bench for a nuclear power plant according to claim 6, characterized in that The specific steps of step 5 include: Step 5.1: Reinstall the outer ring of the rolling bearing A (30) onto the bearing housing (32), reinstall the bearing gland A (31) onto the bearing housing (32) and fix it; Step 5.2: Flip the loader housing (51) to the back side up, reinstall the bearing housing (32) onto the housing (51), and fix it with bolt J (33); Step 5.3: Flip the loader housing (51) to the front side up, reinstall the lower bearing seat (35) into the loader housing (51), and fasten it with bolt N (50). When reinstalling, pay attention to aligning the oil inlet hole; Step 5.4: Reinstall seal ring A (34) and seal ring B (49) into the lower bearing seat (35), and reinstall the lower bearing (36) into the lower bearing seat (35); Step 5.5: Reinstall the loader rotor (136) without coupling A (42) into the loader housing (51), and make the lower end face of the loader thrust disk (37) closely contact with the surface of the lower bearing (36); Step 5.6: Place the loader upper cover (41) horizontally upward, reinstall the outer ring of the rolling bearing B (47) to the corresponding position on the loader upper cover (41), reinstall the bearing gland B (45), and fasten it with bolt L (46); Step 5.7: Flip the loader upper cover (41) to the back side up, reinstall the upper bearing seat (40) to the corresponding position on the loader upper cover (41), and fasten it with bolt K (39); Step 5.8: Reinstall seal ring A (34) and seal ring B (49) into the upper bearing seat (40), and reinstall the upper bearing (38) into the upper bearing seat (40); Step 5.9: Flip the loader upper cover (41) with the upper bearing installed to the front side up, and reinstall it into the loader housing (51), and fasten it with bolt M (48); Step 5.10: Reinstall coupling A (42) onto the loader shaft (44), and fasten it with nut D (43).

12. The assembling method of the thrust bearing test bench for the main pump of a nuclear power plant according to claim 6, wherein The said Step 6 specifically includes: Step 6.1: Reinstall the thrust bearing pressure plate (124) on one side of the thrust bearing base (122), and fasten it with screw C (120); Step 6.2: Reinstall the thrust bearing block (121) and the rubber rope (123) onto the thrust bearing base (122), reinstall the thrust bearing pressure plate (124) on the other side, and fasten it with screw C (120); Step 6.3: Reinstall the balance weight base (118) to the corresponding position inside the disk base (117). When reinstalling, pay attention to preventing jamming; Step 6.4: Reinstall the lower balance weight (119) onto the balance weight base (118) according to the mark; Step 6.5: Reinstall the upper balance weight (116) onto the lower balance weight (119) according to the mark. When reinstalling, pay attention to handling it gently; Step 6.6: Reinstall the thrust bearing unit composed of the thrust bearing base (122) and the thrust bearing block (121) to the corresponding position of the upper balance weight (116) according to the mark; Step 6.7: Reinstall the thrust disk retaining ring (126) onto the disk base (117), and fasten it with bolt Z (127).

13. The assembly method of the main pump thrust bearing test bench for nuclear power plants according to claim 6, characterized in that, The said Step 7 specifically includes: Step 7.1: Place the bearing housing shell (18) on the maintenance square box and level it with a spirit level; Step 7.2: Reinstall the shaft sleeve (73) into the bearing housing shell (18) and fasten it with screw B (74); Step 7.3: Reinstall the sealing ring C (79) and the lower mechanical seal stator unit (72) into the bearing housing shell (18) in sequence and fasten them with bolt Q (71); Step 7.4: Reinstall the screw pump stator (80) into the bearing housing shell (18) and fasten it with bolt R (81); Step 7.5: Reinstall the spring compensation pad (53) into the bearing housing shell (18), noting that the positioning hole of the compensation pad is aligned with the positioning pin D (70); Step 7.6: Reinstall the lower thrust plate (54) into the bearing housing shell (18); Step 7.7: Reinstall the radial-thrust bearing rotor without coupling into the bearing housing shell (18) so that the tile surface of its lower panel (55) contacts the tile surface of the lower thrust plate (54); Step 7.8: Flip the upper thrust plate (67) so that the tile surface faces downward, reinstall the adjusting shim (66), and fasten it with screw A (59); Step 7.9: Reinstall the upper thrust plate (67) into the bearing housing shell (18) so that the tile surface of the upper thrust plate (67) contacts the tile surface of the upper panel (68); Step 7.10: Reinstall the bearing upper cover (63) into the bearing housing shell (18). When reinstalling, note that the positioning pin C (58) on the bearing upper cover (63) is aligned with the positioning hole of the upper thrust plate (67), and fasten it with stud bolt A (65) and nut F (64); Step 7.11: Reinstall the radial bearing (61) onto the bearing upper cover (63) and fasten it with bolt O (60); Step 7.12: Use the bearing rotor alignment device (125) to adjust the clearances around the radial bearing evenly. After adjustment, tighten the adjusting rod (132) to fix the relative positions of the bearing housing rotor and the stator; Step 7.13: Reinstall stud bolt B (78), coupling B (75), and shaft head flange (76) onto the pump shaft (62) in sequence and fasten them with nuts (77).

14. The assembling method of the thrust bearing test bench for the main pump of a nuclear power plant according to claim 6, characterized in that, The said Step 8 specifically includes: Step 8.1: Place the shaft seal cover (20) with its back facing up; Step 8.2: Reinstall the upper mechanical seal stator unit (100) onto the shaft seal cover (20) and fasten it with bolt X (99); Step 8.3: Flip the upper shaft seal cover unit (137) so that its front faces up and wait for reinstallation.

15. The assembling method of the thrust bearing test bench for the main pump of a nuclear power plant according to claim 6, characterized in that, The said Step 9 specifically includes: Step 9.1: Place the base (1) on the test site and level it with a spirit level; Step 9.2: Reinstall the loader (9) into the base (1) and fasten it with bolt C (8); Step 9.3: Reinstall the lower torque meter (12). Connect the lower coupling a (11) to the coupling A (42), install the first positioning pin (15), and fasten it with bolt D (10); Step 9.4: Reinstall the motor support base (3) onto the base (1), and adjust the position of the motor support base (3) so that the lower torque meter coupling b (13) is at the center of the inner hole of the motor support base (3); Step 9.5 Use a level to level the motor support (3) and tighten it with bolts A (2); Step 9.6: Reinstall the radial thrust bearing (16) into the motor support (3), connect the coupling B (75) to the coupling b (13), install the first locating pin (15), and tighten it with the bolt E (14), and reinstall the bolt F (17) and tighten it; Step 9.7: When reinstalling bolts E (14) and bolts F (17), there must be no interference or stress. If there is any abnormality, adjust the position of the motor support (3); Step 9.8: Remove the bearing rotor centering device (125) and re-measure the clearance around the radial bearing to ensure that it is uniform; Step 9.9: Reinstall the upper shaft cap unit (137) onto the bearing upper cover (63) and tighten it with bolts G (19); Step 9.10: Reinstall coupling C (21) onto the pump shaft (62); Step 9.11: Reinstall the torque meter (23), connect its lower end surface to the coupling C (21), and tighten it with bolt a (22); Step 9.12: Connect the motor bracket (6) to the motor (7) and tighten them with bolts b (130); Step 9.13: Reinstall the connected motor bracket (6) and motor (7) onto the motor support base (3) and reinstall bolt B (5); Step 9.14: Align the coupling E (28) and the coupling e (29), and adjust the alignment data by matching the motor bracket (6) and the motor support base (3); Step 9.15: After alignment is complete, tighten bolt B (5), reinstall bolt I (26) and nut C (27) and tighten.

Images