A device for fixing the rotor of a motor in a circulating seawater pump of a nuclear power plant

Abstract

The application belongs to the technical field of nuclear power plant rotating equipment maintenance engineering, and particularly relates to a device for fixing a motor rotor in a circulating seawater pump of a nuclear power plant. The device is tightly attached to a bearing fastening bolt through a locking assembly, so as to reduce the shaking of the fastening bolt and effectively solve the problem of motor vibration caused by the loosening of the bearing fastening bolt, thereby ensuring the normal operation of the seawater circulating pump.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of nuclear power plant rotating equipment maintenance engineering, and particularly relates to a device for fixing a motor rotor in a circulating seawater pump of a nuclear power plant. BACKGROUND

[0002] The circulating seawater pump of the nuclear power plant is used for supplying circulating cooling water to a condenser of a steam turbine and discharging circulating water from the condenser to the sea. The motor of the circulating seawater pump is a variable-pole double-speed induction motor, and four radial guide bearings are arranged above and below the motor to ensure that the motor rotor is located at a central position during operation, so as to ensure that the motor rotor is concentric with a pump rotor.

[0003] At present, the upper radial guide bearings of the motor have repeatedly appeared abnormal sound and vibration, which reduces the reliability of the equipment. SUMMARY

[0004] The application aims to provide a device for fixing a motor rotor in a circulating seawater pump of a nuclear power plant, which solves the problem that the upper radial guide bearings of the motor repeatedly appear abnormal sound and vibration.

[0005] The technical scheme for achieving the application comprises the following steps:

[0006] The device for fixing a motor rotor in a circulating seawater pump of a nuclear power plant provided by the application comprises a support cylinder, a rotor positioning assembly and a locking assembly.

[0007] The motor rotor is located inside the support cylinder.

[0008] The rotor positioning assembly is used for fixing the motor rotor at the central position inside the support cylinder.

[0009] The rotor positioning assembly is fixed on the support cylinder through bearing fastening bolts, and the heads of the bearing fastening bolts are locked and fixed on the support cylinder through the locking assembly.

[0010] Optionally, the locking assembly comprises a locking ring and a locking plate.

[0011] The inner hole of the locking ring is matched with the shape of the head of the bearing fastening bolt, and is used for fixing the head of the bearing fastening bolt.

[0012] One end of the locking plate is used for fixing the locking ring, and the other end of the locking plate is provided with a bolt through hole, which is used for fixing the locking plate on the support cylinder.

[0013] Optionally,

[0014] The locking plate is in an arc structure, and is matched with the outer arc size of the support cylinder.

[0015] Optionally,

[0016] One end of the locking plate is a circular arc shape, which is aligned with the outer circle of the locking ring and fixed by at least one welding point.

[0017] Optionally,

[0018] The inner hole of the locking ring is a hexagonal hole, which cooperates with the outer hexagonal head of the bearing fastening bolt, and each cooperating surface cannot pass the 0.03mm feeler gauge inspection.

[0019] Optionally,

[0020] The bearing fastening bolt is a flange bolt.

[0021] Optionally,

[0022] One end of the locking plate is provided with a sunken platform, which is used to accommodate the flange plate of the bearing fastening bolt when the inner side of the locking plate is tightly attached to the outer circular arc of the support cylinder.

[0023] Optionally, the rotor positioning assembly comprises a pillow block and a guide bearing;

[0024] The guide bearing is an arc structure, the inner side of the arc of the guide bearing matches the outer side of the motor rotor, and the outer side of the guide bearing tightly matches the inner side of the pillow block;

[0025] The guide bearing and the pillow block are fixed by a pillow block fastening bolt;

[0026] The outer side of the pillow block tightly matches the inner wall of the support cylinder, and is fixed with the support cylinder by the bearing fastening bolt.

[0027] Optionally,

[0028] The outer side of the pillow block is provided with a protrusion, which tightly matches the inner wall of the support cylinder.

[0029] Optionally,

[0030] Four first through holes and two second through holes are arranged on the pillow block;

[0031] The first through hole is used to fix the pillow block fastening bolt;

[0032] The second through hole is used to fix the bearing fastening bolt.

[0033] The beneficial technical effects of the present application are:

[0034] 1) The device for fixing the rotor of the motor in the circulating seawater pump of the nuclear power station provided by the application has simple structure, convenient installation, and the locking ring can be closely combined with the fastening bolt to reduce the shaking of the bolt, prevent the loosening of the bolt, effectively reduce the risk of loosening of the bearing fastening bolt, and improve the operation reliability of the seawater circulating pump.

[0035] 2) The device for fixing the rotor of the motor in the circulating seawater pump of the nuclear power station provided by the application has a certain arc, and can be better combined with the surrounding cylinder of the support to increase the contact area.

[0036] 3) The device for fixing the rotor of the motor in the circulating seawater pump of the nuclear power station provided by the application replaces the original bolt with a locking washer with a flange bolt, which eliminates the risk of bolt loosening caused by the failure of the locking washer.

[0037] 4) The device for fixing the rotor of the motor in the circulating seawater pump of the nuclear power station provided by the application adopts spot welding connection between the locking plate and the locking ring, has the characteristics of adapting to the position of the hexagonal surface of the bolt and being reusable. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 The structure diagram of the device for fixing the rotor of the motor in the circulating seawater pump of the nuclear power station provided by the embodiment of the application is shown;

[0039] Figure 2 The top view of the locking assembly in the device for fixing the rotor of the motor in the circulating seawater pump of the nuclear power station provided by the embodiment of the application is shown;

[0040] Figure 3 The top view of the locking plate in the device for fixing the rotor of the motor in the circulating seawater pump of the nuclear power station provided by the embodiment of the application is shown;

[0041] Figure 4 The cross-sectional view of the locking ring in the device for fixing the rotor of the motor in the circulating seawater pump of the nuclear power station provided by the embodiment of the application is shown;

[0042] Figure 5 The top view of the locking ring in the device for fixing the rotor of the motor in the circulating seawater pump of the nuclear power station provided by the embodiment of the application is shown;

[0043] Figure 6 The cross-sectional view of the locking plate in the device for fixing the rotor of the motor in the circulating seawater pump of the nuclear power station provided by the embodiment of the application is shown;

[0044] Figure 7 The cross-sectional view of the pillow in the device for fixing the rotor of the motor in the circulating seawater pump of the nuclear power station provided by the embodiment of the application is shown;

[0045] Figure 8A top view of a device for fixing the bearing pillow of the motor rotor in a circulating seawater pump of a nuclear power plant is provided in the embodiments of the present application.

[0046] In the drawings:

[0047] 1 - support cylinder;

[0048] 2 - rotor positioning assembly; 21 - bearing pillow, 211 - protrusion, 212 - first through hole, 213 - second through hole; 22 - guide bearing; 23 - bearing pillow fastening bolt;

[0049] 3 - locking assembly; 31 - locking ring, 311 - inner hole; 32 - locking plate, 321 - circular arc, 322 - sunken platform; 33 - bolt through hole; 34 - welding point; 35 - locking assembly fastening bolt;

[0050] 4 - motor rotor;

[0051] 5 - bearing fastening bolt. DETAILED DESCRIPTION

[0052] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described in detail below in conjunction with the drawings in the embodiments of the present application. Obviously, the following described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments described in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0053] The present inventors found in research that the upper part of the motor radial guide bearing has abnormal sound and vibration, which is caused by the fracture of the left fastening bolt and the loosening of the right fastening bolt of the lower part of the radial guide bearing. In order to completely solve the problem of loosening of the fastening bolt, a motor bearing fastening bolt locking device is needed.

[0054] Therefore, the embodiments of the present application provide a device for fixing the motor rotor in a circulating seawater pump of a nuclear power plant, which is simple in structure and convenient to install. The locking assembly is tightly attached to the bearing fastening bolt, which reduces the shaking of the fastening bolt and effectively solves the problem of loosening of the bearing fastening bolt, which causes the vibration of the motor to become larger, thereby ensuring the normal operation of the seawater circulating pump.

[0055] Based on the above, in order to clearly and specifically describe the above advantages of the present application, the specific embodiments of the present application will be described below in conjunction with the drawings.

[0056] Referring to Figure 1 , the figure is a structural schematic diagram of a device for fixing the motor rotor in a circulating seawater pump of a nuclear power plant provided in the embodiments of the present application.

[0057] The embodiment of the present application provides a device for fixing a motor rotor in a circulating seawater pump of a nuclear power plant, which comprises a support cylinder 1, a rotor positioning assembly 2 and a locking assembly 3.

[0058] The motor rotor 4 is located inside the support cylinder 1.

[0059] The rotor positioning assembly 2 is used for fixing the motor rotor 4 at the inner center of the support cylinder 1.

[0060] The rotor positioning assembly 2 is fixed on the support cylinder 1 through a bearing fastening bolt 5, and the head of the bearing fastening bolt 5 is locked and fixed with the support cylinder 1 through the locking assembly 3.

[0061] In the embodiment of the present application, the rotor positioning assembly 2 is fixed on the support cylinder 1 through the bearing fastening bolt 5, and the head of the bearing fastening bolt 5 is locked and fixed with the support cylinder 1 through the locking assembly 3, so that the bearing fastening bolt 5 can be prevented from shaking, the problem that the motor vibration is increased due to the loosening of the bearing fastening bolt is effectively solved, and the normal operation of the seawater circulating pump is ensured.

[0062] In some possible implementation manners of the embodiment of the present application, as shown in Figure 1 and Figure 2 , the locking assembly 3 comprises a locking ring 31 and a locking plate 32.

[0063] The inner hole 311 of the locking ring 31 is matched with the shape of the head of the bearing fastening bolt 5, and is used for fixing the head of the bearing fastening bolt 5.

[0064] One end of the locking plate 32 is used for fixing the locking ring 31, and the other end of the locking plate 32 is provided with a bolt through hole 33, which is used for fixing the locking plate 32 on the support cylinder 1 by using a locking assembly fastening bolt 35.

[0065] In one example, the locking plate 32 is in an arc structure and is matched with the outer arc size of the support cylinder 1, so that the locking plate 32 can be better attached to the support cylinder 1, the contact area is increased, and the stability is improved.

[0066] In some possible implementation manners of the embodiment of the present application, as shown in Figure 2 , Figure 3 , one end of the locking plate 32 is in a circular arc shape 321, and the circular arc shape 321 is fixed after being aligned with the outer circle of the locking ring 31 through at least one welding point 34.

[0067] In some possible implementation manners of the embodiment of the present application, as shown in Figure 2 , Figure 4 and Figure 5 , the inner hole 311 of the locking ring 31 is a hexagonal inner hole, is matched with the hexagonal outer surface of the head of the bearing fastening bolt 5, and each matched surface cannot pass the 0.03mm feeler gauge.

[0068] It should be noted that the locking ring 31 and the locking plate 32 are connected by spot welding, which has the characteristics of adapting the position of the bearing fastening bolt 5 and being reusable.

[0069] As an example, the bearing fastening bolt 6 is a flange bolt. It can be understood that the original bolt is replaced by a flange bolt in the form of a locking washer, which eliminates the risk of bolt loosening caused by the failure of the locking washer. Then, as shown in Figure 2 、 Figure 4 and Figure 5 , the inner hole 311 is divided into a section matched with the hexagonal head of the bearing fastening bolt 5 and a section matched with the flange of the bearing fastening bolt 5.

[0070] In some possible implementations of the embodiments of the present application, as shown in Figure 1 and Figure 6 , one end of the locking plate 32 is provided with a sunken platform 322 for accommodating the flange of the bearing fastening bolt 5 when the inner side of the locking plate 32 is tightly attached to the outer arc of the support cylinder 1.

[0071] In some possible implementations of the embodiments of the present application, as shown in Figure 1 , the rotor positioning assembly 2 includes a pillow block 21 and a guide bearing 22.

[0072] The guide bearing 22 is an arc structure, the inner side of the guide bearing 22 is matched with the outer side of the motor rotor 4, and the outer side of the guide bearing 22 is tightly attached to the inner side of the pillow block 21.

[0073] The guide bearing 22 and the pillow block 21 are fixed by a pillow block fastening bolt 23.

[0074] The outer side of the pillow block 21 is tightly attached to the inner wall of the support cylinder 1 and is fixed to the support cylinder 1 by the bearing fastening bolt 5.

[0075] In a specific example, as shown in Figure 1 and Figure 7 , the outer side of the pillow block 21 is provided with a protrusion 211 which is tightly attached to the inner wall of the support cylinder 1.

[0076] In a specific example, as shown in Figure 1 、 Figure 7 and Figure 8 , the pillow block 21 is provided with four first through holes 212 and two second through holes 213.

[0077] The first through hole 212 is used to fix the pillow block fastening bolt 23.

[0078] The second through hole 213 is used to fix the bearing fastening bolt 5.

[0079] The application will be described in detail below with reference to a specific example.

[0080] The application will be described in detail below with reference to a specific example.

[0081] Step 1: Process the components of the locking assembly 3, i.e. the locking ring 31 and the locking plate 32, and repair the inner hexagonal hole of the locking ring 31 and the outer hexagonal matching surface of the bearing fastening bolt 5. The matching surfaces are checked with a 0.03mm feeler gauge and cannot pass. The locking plate 32 is bent according to the outer circular arc size of the support cylinder 1.

[0082] Step 2: Adjust the motor rotor 4 to the center of the support cylinder 1.

[0083] Step 3: Install the tile pillow 21 to the guide bearing 22 and fasten the four tile pillow fastening bolts 23.

[0084] Step 4: Install the assembled guide bearing 22 and tile pillow 21 to the corresponding position between the motor rotor 4 and the support cylinder 1, align the bolt holes, and install the two bearing fastening bolts 5.

[0085] Step 5: Adjust the radial gap between the guide bearing 22 and the motor rotor 4 to the standard value, and fasten the two bearing fastening bolts 5 using a torque wrench.

[0086] Step 6: Install the locking ring 31 to the hexagonal surface of the bearing fastening bolt 5.

[0087] Step 7: Align the circular arc 321 of the locking plate 32 with the outer circle of the locking ring 31, fix the locking plate 32 to the bolt hole of the support cylinder 1 using the locking assembly fastening bolt 35, and bond and fix the locking plate 32 and the locking ring 31 using glue.

[0088] Step 8: Take down the locking plate 32 and the locking ring 31 as a whole, fix them by spot welding the welding points 34, and make the locking assembly 3.

[0089] Step 9: Install the locking assembly 3 in place and fasten the bolt 5.

[0090] The application will be described in detail below with reference to a specific example. However, the application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the application. The contents not described in detail in the application can adopt the existing technology.

Claims

1. A device for fixing the motor rotor in a circulating seawater pump of a nuclear power plant, characterized in that: The device comprises: a bracket shroud, a rotor positioning assembly and a locking assembly; The motor rotor is located inside the bracket casing; There are multiple rotor positioning assemblies for fixing the motor rotor at the inner center of the bracket shroud; The rotor positioning assembly is fixed to the bracket shroud via a bearing fastening bolt, and the head of the bearing fastening bolt is locked and fixed to the bracket shroud via the locking assembly; The locking assembly includes: a locking ring and a locking plate; The inner hole of the locking ring matches the shape of the head of the bearing fastening bolt and is used to fix the head of the bearing fastening bolt; One end of the locking plate is used to fix the locking ring; the other end of the locking plate is provided with a bolt through hole for fixing the locking plate to the bracket circumference; The rotor positioning assembly includes: a pillow block and a guide bearing; The guide bearing is an arc-shaped structure, the inner curvature of the guide bearing matches the outer side of the motor rotor, and the outer side of the guide bearing fits tightly with the inner side of the shoe pillow; The guide bearing and the shoe pillow are fixed by shoe pillow fastening bolts; The outer side of the shoe pillow is tightly fitted with the inner wall of the bracket shroud and is fixed to the bracket shroud by the bearing fastening bolts; The locking assembly consists of a locking ring and a locking plate. Repair the inner hexagonal hole of the locking ring and the outer hexagonal mating surface of the bearing fastening bolt; adjust the motor rotor to the center of the bracket cylinder; install the bearing pad on the guide bearing and tighten the 4 bearing pad fastening bolts; install the assembled guide bearing and bearing pad to the corresponding positions between the motor rotor and the bracket cylinder, align the bolt holes, and install the two bearing fastening bolts; adjust the radial clearance between the guide bearing and the motor rotor to the standard value, and tighten the two bearing fastening bolts with a torque wrench; install the locking ring on the hexagon of the bearing fastening bolt; align the arc shape of the locking plate with the outer circle of the locking ring, fix the locking plate to the bolt hole of the bracket cylinder with the locking assembly fastening bolts, and glue the locking plate and locking ring together; remove the locking plate and locking ring as a whole, and fix them by spot welding to make a locking assembly; install the locking assembly in place and tighten the bolts.

2. The device for fixing the motor rotor in a circulating seawater pump of a nuclear power plant according to claim 1, characterized in that: The locking plate is an arc-shaped structure that matches the outer arc size of the bracket casing.

3. The device for fixing the motor rotor in a circulating seawater pump of a nuclear power plant according to claim 1, characterized in that: One end of the locking plate is in an arc shape, and after the arc shape is aligned with the outer circle of the locking ring, it is fixed by at least one welding point.

4. The device for fixing the motor rotor in a circulating seawater pump of a nuclear power plant according to claim 1, characterized in that: The inner hole of the locking ring is a hexagonal hole, which cooperates with the outer hexagon of the head of the bearing fastening bolt, and each matching surface cannot pass the inspection with a 0.03mm feeler gauge.

5. The device for fixing the motor rotor in a circulating seawater pump of a nuclear power plant according to claim 1, characterized in that: The bearing fastening bolts are flange bolts.

6. The device for fixing the motor rotor in a circulating seawater pump of a nuclear power plant according to claim 5, characterized in that: One end of the locking plate is provided with a sunken table surface for accommodating the flange of the bearing fastening bolt when the inner side of the locking plate is in close contact with the outer arc of the bracket circumference.

7. The device for fixing the motor rotor in a circulating seawater pump of a nuclear power plant according to claim 1, characterized in that: A protrusion is provided on the outer side of the tile pillow, and the protrusion is tightly fitted with the inner wall of the bracket surrounding tube.

8. The device for fixing the motor rotor in a circulating seawater pump of a nuclear power plant according to claim 1, characterized in that: The tile pillow is provided with 4 first through holes and 2 second through holes; The first through hole is used to fix the fastening bolt of the tile pillow; The second through hole is used to fix the bearing fastening bolt.

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