Multi-stage horizontal centrifugal pump core pulling device

Abstract

The invention belongs to the technical field of nuclear power station rotating equipment maintenance engineering, and particularly relates to a multi-stage horizontal centrifugal pump core pulling device. The core bag supporting frame is fixed on the pump shell; the two ends of the roller are connected with the roller frame through the sliding bearings, and the clamping springs A are clamped in grooves in the two ends of the roller and used for fixing the sliding bearings. The roller frame is connected with the core package supporting frame through a bolt A, and a nut A is in threaded connection with the bolt A and used for locking the roller frame and adjusting the height of the roller frame; the dummy shaft A is in threaded connection with the pump shaft; the guide cylinder is fixed on the dummy shaft A; the bearing is in interference fit connection with the bearing shaft, the bearing is placed in a groove of the roller frame, the bearing shaft penetrates through a hole of the support below the guide cylinder, and the clamping spring B is clamped in the groove of the bearing shaft and used for limiting axial movement of the bearing shaft; the driving end supporting frame is fixed to the pump shell. And the center of the rotor core in the pump shell can be accurately adjusted, so that stable movement in the axial direction is realized, the labor intensity of maintenance personnel is reduced, the working efficiency is improved, and the risk caused by hoisting machinery is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power plant rotating equipment maintenance engineering, and in particular relates to a multi-stage horizontal centrifugal pump core pulling device. Background Art

[0002] Tianwan Nuclear Power Plant Units 1 and 2 are equipped with 10 main feedwater pumps manufactured and supplied by JSC Sumy Frunze NPO of Russia. They are horizontal, double-shell core-pulling multistage centrifugal pumps used to transport secondary circuit desalted water. The core-pulling sequence of the existing main feedwater pump is as follows: install a dummy shaft on the drive end pump shaft - place the core pack stand on the free end - use a crane to hang the sling on the drive end dummy shaft - use a hand chain hoist to hang the sling on the free end pump shaft - use a crane and a hand chain hoist to adjust the height of the pump shafts at both ends at the same time - move the core pack and place one side of the core pack on the core pack stand - remove the free end and drive end slings - use a crane to hang the sling on the entire core pack shell - continuously adjust the entire core pack to pull it out and place it on the core pack stand - transport it to the maintenance site. The process of extracting the core package seems simple, but it takes a long time to use a crane and a hand winch to simultaneously adjust the height of the pump shafts at both ends. The crane and the hand winch cannot accurately adjust the height due to the tools themselves, which can easily cause the core package to get stuck in the pump casing; secondly, constantly changing the lifting position will also increase the corresponding working hours; the staff needs to constantly operate the hand winch during the adjustment process, and the whole process takes a long time. The staff are easily tired, which leads to a decrease in work efficiency and increased work risks. Summary of the invention

[0003] The object of the present invention is to provide a multi-stage horizontal centrifugal pump core pulling device, which has a simple structure and is easy to use. It can accurately adjust the center of the rotor core package in the pump casing to achieve smooth axial movement, and change the original core package extraction from the assistance of lifting machinery to mechanical movement, thereby reducing the labor intensity of maintenance personnel, improving work efficiency, and reducing the risks brought by lifting machinery.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A multi-stage horizontal centrifugal pump core pulling device, the core bag support frame is fixed on the pump housing; the rollers are connected to the roller frame by sliding bearings at both ends, and the retaining spring A is clamped in the grooves at both ends of the roller to fix the sliding bearings; the roller frame is connected to the core bag support frame by bolts A, and nuts A are connected to bolts A by threads to lock the roller frame and adjust its height; the dummy shaft A is connected to the pump shaft by threads; the guide cylinder is fixed to the dummy shaft A; the bearing is connected to the bearing shaft by interference fit, the bearing is placed in the groove of the roller frame, the bearing shaft passes through the hole of the bracket below the guide cylinder, and the retaining spring B is clamped in the groove of the bearing shaft to limit the axial movement of the bearing shaft; the driving end support frame is fixed on On the pump housing; bolt B passes through the hole of the driving end support frame and is threadedly connected to the roller frame, and nut C and bolt B are threadedly connected, which are used to lock the roller frame and adjust its height, so that the roller supports the dummy shaft C; a through hole is provided in the middle of the roller, and the roller shaft is inserted therein; threads are provided at both ends of the roller shaft, and the roller shaft is passed through the through holes on both sides of the roller frame and locked with nuts D; the dummy shaft D is installed on the pump shaft; the dummy shaft C is threadedly connected to the pump shaft and presses against the dummy shaft D; the dummy shaft B is threadedly connected to the dummy shaft C; the support plate is fixed on the pump housing; the screw rod passes through the long hole of the support plate and is threadedly connected to the core bag; gasket B and nut E are installed on both sides of the inner and outer sides of the support plate.

[0006] The core pack support frame is fixed to the pump casing by main bolts and main nuts.

[0007] The guide cylinder is fixed on the false shaft A by means of set screws.

[0008] The drive end support frame is fixed to the pump casing by stud bolts, gasket A and nut B.

[0009] The support plate is fixed to the pump casing by stud bolts, gasket A and nut B.

[0010] Adjust the height of the roller frame by nut A and bolt A so that the core pack is in the center of the pump casing at the free end.

[0011] Adjust the height of the roller frame by bolts B and nuts C so that the core pack is in the center of the pump housing at the drive end.

[0012] The core pack is slowly separated from the pump casing by rotating the nut E on the inner side of the support plate. During the separation process of the core pack and the pump casing, the nut E on the outer side of the support plate is slowly rotated. The nut E on the outer side of the support plate is used to prevent the core pack from suddenly sliding toward the drive end.

[0013] When most of the core package is placed on the core package support frame, gradually remove the drive side screw and dummy shaft B.

[0014] Slowly pull the pump shaft on the free side to make the core package located on the roller frame; remove the guide cylinder on the free side; lift the core package to the maintenance site; remove all tools in reverse order and clean the site. The above operations can realize the core pulling operation of the multi-stage horizontal centrifugal pump.

[0015] The beneficial effects achieved by the present invention are:

[0016] The multi-stage horizontal centrifugal pump core-pulling device of the present invention has a simple structure and is easy to use;

[0017] The core-pulling device of a multi-stage horizontal centrifugal pump of the present invention can accurately adjust the center of the rotor core package in the pump housing through the top screws at both ends;

[0018] A core pulling device for a multi-stage horizontal centrifugal pump of the present invention can separate the rotor core package from the pump casing by a pull rod tool;

[0019] In a multi-stage horizontal centrifugal pump core pulling device of the present invention, the V-shaped roller at the free end increases the contact area with the core package, thereby reducing the risk of the core package falling off the roller;

[0020] The multi-stage horizontal centrifugal pump core pulling device of the present invention effectively reduces the labor intensity of maintenance personnel, improves maintenance efficiency, and reduces the radiation time of personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a multi-stage horizontal centrifugal pump core-pulling device provided by the present invention;

[0022] Figure 2 A schematic diagram of the driving end portion of a multi-stage horizontal centrifugal pump core pulling device provided by the present invention;

[0023] Figure 3 A schematic diagram of the free end portion of a multi-stage horizontal centrifugal pump core pulling device provided by the present invention;

[0024] In the figure: 1. pump casing; 2. core pack; 3. dummy shaft A; 4. set screw; 5. guide cylinder; 6. pump shaft; 7. roller; 8. roller frame; 9. sliding bearing; 10. core pack support frame; 11. retaining spring A; 12. retaining spring B; 13. bearing shaft; 14. bearing; 15. nut A; 16. bolt A; 17. bolt B; 18. drive end support frame; 19. nut B; 20. gasket A; 21. stud bolt; 22. nut C; 23. roller frame; 24. roller shaft; 25. nut D; 26. roller; 27. dummy shaft B; 28. dummy shaft C; 29. ​​dummy shaft D; 30. screw; 31. nut E; 32. gasket B; 33. support plate; 34. main bolt; 35. main nut. DETAILED DESCRIPTION

[0025] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] A multi-stage horizontal centrifugal pump core pulling device includes a dummy shaft, a roller, a roller wheel, a support frame, a guide cylinder, a guide frame, a support plate, a bearing, a screw and other components. First, the dummy shaft is installed on the shafts of the driving end and the free end, and then the driving end support frame is fixed to the end face of the driving end pump casing with bolts, and the height of the core package driving side pump shaft is adjusted by adjusting the height of the roller; the core package stand is fixed to the end face of the free end pump casing, and the height of the free end pump shaft is adjusted by adjusting the roller frame. The temperature of the pump chamber medium is high, the core package and the pump casing are tightly matched, and the nut on the screw on the inner side of the support plate can more easily separate the core package from the pump casing. The roller adopts a V-shaped design, which increases the contact area with the core package and reduces the risk of the core package falling from the roller. This device can accurately adjust the height of the pump shafts at both ends, adjust the core package to the center of the pump casing, so that the core package can be smoothly pulled out of the pump casing and safely and reliably placed on the core package support frame.

[0027] A multi-stage horizontal centrifugal pump core pulling device connection / installation relationship:

[0028] The core package support frame 10 is fixed to the pump housing 1 by the main bolt 34 and the main nut 35; the two ends of the roller 7 are connected to the roller frame 8 by sliding bearings 9, and the retaining spring A11 is stuck in the grooves at both ends of the roller 7 to fix the sliding bearings 9; the roller frame 8 is connected to the core package support frame 10 by bolts A16, and the nut A15 is connected to the bolt A16 by threads to lock the roller frame 8 and adjust its height; the dummy shaft A3 is connected to the pump shaft 6 by threads; the guide cylinder 5 is fixed to the dummy shaft A3 by the set screw 4; the bearing 14 is connected to the bearing shaft 13 by interference fit, and the bearing 14 The bearing shaft 13 is placed in the groove of the roller frame 8, and the bearing shaft 13 passes through the hole of the bracket below the guide cylinder 5. The retaining ring B12 is stuck in the groove of the bearing shaft 13 to limit the axial movement of the bearing shaft 13; the driving end support frame 18 is fixed to the pump housing 1 by stud bolts 21, gaskets A20 and nuts B19; bolts B17 pass through the holes of the driving end support frame 18 and are connected to the roller frame 23 by threads, and nuts C22 and bolts B17 are connected by threads to lock the roller frame 23 and adjust its height, so that the roller 26 supports the dummy shaft C28; the roller 26 is provided in the middle There is a through hole, and the roller shaft 24 is inserted therein; threads are provided at both ends of the roller shaft 24, and the roller shaft 24 is passed through the through holes on both sides of the roller frame 23 and locked with nuts D25; the dummy shaft D29 is installed on the pump shaft 6; the dummy shaft C28 is connected to the pump shaft 6 by threads and abuts against the dummy shaft D29; the dummy shaft B27 is connected to the dummy shaft C28 by threads; the support plate 33 is fixed to the pump housing 1 by stud bolts 21, gaskets A20 and nuts B19; the screw rod 30 passes through the long hole of the support plate 33 and is connected to the core bag 2 by threads; gaskets B3 are installed on both sides of the support plate 33 2 and nut E31; adjust the height of the roller frame 8 by nut A15 and bolt A16, so that the core pack is in the center of the pump casing at the free end; adjust the height of the roller frame 23 by bolt B17 and nut C22, so that the core pack is in the center of the pump casing at the drive end; slowly separate the core pack 2 from the pump casing 1 by rotating the nut E31 on the inner side of the support plate 33; during the separation process of the core pack 2 from the pump casing 1, slowly rotate the nut E31 on the outer side of the support plate 33, the nut E31 on the outer side of the support plate 33 is used to prevent the core pack 2 from suddenly sliding to the drive end, causing personal injury or equipment damage.

[0029] Install the core package support frame 10 on the pump casing 1; pre-install the roller frame 8 on the core package support frame 10; screw the dummy shaft A3 onto the pump shaft 6 through threads; put the guide cylinder 5 on the dummy shaft A3, so that the two bearings under the guide cylinder 5 are located in the grooves of the roller frame 8; adjust the guide cylinder 5 to a suitable position and lock it on the dummy shaft A3 with the set screw 5; install the dummy shafts D29, C28, and B27 on the pump shaft 6 respectively; install the drive end support frame 18 on the pump casing 1; install the roller 26 on the roller frame 23, and then install it as a whole on the support frame 18; adjust the two support plates 33 on the drive side to a suitable position and install them on the pump casing 1; pass the two screw rods 30 through the long holes on the support plate 33 respectively, and screw them into the threaded holes on the core package 2; install gaskets B32 and nuts on both the inner and outer sides of the support plate 33 E31; by adjusting the connecting bolts between the driving end support frame and the roller frame and the core package support frame and the roller frame, the core package 2 is lifted as a whole, so that the core package 2 is slightly separated from the shell 1; by tightening the inner nut E31 of the support plate 33, the core package 2 is pushed toward the free side; when the core package 2 is initially on the roller frame 8, the core package 2 is slowly pushed, and during the separation process of the core package 2 and the pump shell 1, the outer nut E31 of the support plate 33 is slowly rotated. The outer nut E31 of the support plate 33 is used to prevent the core package 2 from suddenly sliding toward the driving end; when most of the core package 2 is placed on the core package support frame, the driving side screw 30, the dummy shaft B27 and other tools are gradually removed; on the free side, the pump shaft 6 is slowly pulled so that the core package 2 is located on the roller frame as a whole; the free side guide cylinder 5 is removed; the core package 2 is lifted to the maintenance site; all tools are removed in reverse steps and the site is cleaned. The above operations can realize the core pulling operation of the multi-stage horizontal centrifugal pump.

Claims

1. A multi-stage horizontal centrifugal pump core pulling device, characterized in that: The core pack support frame is fixed on the pump casing; the rollers are connected to the roller frame with sliding bearings at both ends, and the retaining ring A is stuck in the grooves at both ends of the roller to fix the sliding bearings; the roller frame is connected to the core pack support frame by bolt A, and the nut A is connected to the bolt A by thread to lock the roller frame and adjust its height; the dummy shaft A is connected to the pump shaft by thread; the guide cylinder is fixed on the dummy shaft A; the bearing is connected to the bearing shaft by interference fit, the bearing is placed in the groove of the roller frame, the bearing shaft passes through the hole of the bracket below the guide cylinder, and the retaining ring B is stuck in the groove of the bearing shaft to limit the axial movement of the bearing shaft; the drive end support frame is fixed on the pump casing; bolt B The hole passing through the driving end support frame is connected to the roller frame by thread, and the nut C and the bolt B are connected by thread, which are used to lock the roller frame and adjust its height, so that the roller supports the dummy shaft C; a through hole is provided in the middle of the roller, and the roller shaft is inserted therein; threads are provided at both ends of the roller shaft, and the roller shaft is passed through the through holes on both sides of the roller frame and locked with nuts D; the dummy shaft D is installed on the pump shaft; the dummy shaft C is connected to the pump shaft by thread and presses against the dummy shaft D; the dummy shaft B is connected to the dummy shaft C by thread; the support plate is fixed on the pump casing; the screw rod passes through the long hole of the support plate and is connected to the core bag by thread; gaskets B and nuts E are installed on both sides inside and outside the support plate.

2. The multi-stage horizontal centrifugal pump core-pulling device according to claim 1, characterized in that: The core pack support frame is fixed to the pump casing by main bolts and main nuts.

3. The core-pulling device of a multi-stage horizontal centrifugal pump according to claim 1, characterized in that: The guide cylinder is fixed on the false shaft A by means of set screws.

4. The multi-stage horizontal centrifugal pump core-pulling device according to claim 1, characterized in that: The drive end support frame is fixed to the pump casing by stud bolts, gasket A and nut B.

5. The multi-stage horizontal centrifugal pump core-pulling device according to claim 1, characterized in that: The support plate is fixed to the pump casing by stud bolts, gasket A and nut B.

6. The multi-stage horizontal centrifugal pump core-pulling device according to claim 1, characterized in that: Adjust the height of the roller frame by nut A and bolt A so that the core pack is in the center of the pump casing at the free end.

7. The core-pulling device for a multi-stage horizontal centrifugal pump according to claim 1, characterized in that: Adjust the height of the roller frame by bolts B and nuts C so that the core pack is in the center of the pump housing at the drive end.

8. The core-pulling device for a multi-stage horizontal centrifugal pump according to claim 1, characterized in that: The core pack is slowly separated from the pump casing by rotating the nut E on the inner side of the support plate. During the separation process of the core pack and the pump casing, the nut E on the outer side of the support plate is slowly rotated. The nut E on the outer side of the support plate is used to prevent the core pack from suddenly sliding toward the drive end.

9. The core-pulling device of a multi-stage horizontal centrifugal pump according to claim 8, characterized in that: When most of the core package is placed on the core package support frame, gradually remove the drive side screw and dummy shaft B.

10. The core-pulling device of a multi-stage horizontal centrifugal pump according to claim 9, characterized in that: Slowly pull the pump shaft on the free side to make the core package located on the roller frame; remove the guide cylinder on the free side; lift the core package to the maintenance site; remove all tools in reverse order and clean the site. The above operations can realize the core pulling operation of the multi-stage horizontal centrifugal pump.

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