A maintenance device for spring components of nuclear power plant steam turbine generator

Abstract

The present invention belongs to the field of generator maintenance, and specifically relates to a maintenance device for a spring assembly of a steam turbine generator in a nuclear power plant, comprising: a power mechanism and a jacking mechanism; the power mechanism is connected to the jacking mechanism, and is used to drive the jacking mechanism to move; the jacking mechanism is detachably arranged in the gap between the spring assembly, the fixed guide block and the fixed mounting seat, and is used to apply a force to the spring assembly under the drive of the power mechanism, so that the spring assembly is stretched straight under the force applied by the jacking mechanism. The technical solution of jacking using the side space of the spring assembly and the leaf spring guide block adopted by the present invention is not limited by the space of the generator stator structure, and solves the technical problem that the jacking screw area of ​​some spring assemblies in the traditional process is inaccessible and cannot be disassembled, and achieves the technical effect of comprehensive maintenance of this type of spring assembly.

Description

Technical Field

[0001] The present application belongs to the field of generator maintenance, and specifically relates to a maintenance device for a spring assembly of a nuclear power plant steam turbine generator. Background Art

[0002] During the operation of the generator, the interaction between the stator winding current and the end leakage magnetic field will generate a large double frequency (100Hz) vibration force. Therefore, a spring assembly structure is designed at the end of the generator stator to buffer and release the vibration stress between the stator pressure ring, cone ring and other components.

[0003] Steam turbine generators have inherent design and manufacturing defects, so the natural frequency of the elliptical vibration mode at the end of the stator is unqualified when leaving the factory, and has always been between 107Hz and 109Hz. Because the stator has a natural frequency close to double the frequency, and the corresponding vibration mode is elliptical, the end winding will resonate or vibrate greatly under the excitation of electromagnetic interference force. The large vibration force has caused the generator to have many faults such as spring assembly fasteners falling off, leaf spring wear, and compensation part wear.

[0004] To handle the above spring assembly failures, the spring assembly needs to be removed for repair. The traditional disassembly and assembly process is to remove the windshield on the back of the spring assembly and use a top screw to extend the leaf spring to release its elastic properties. However, some stator components are installed after the spring assembly is installed during the generator manufacturing phase. The manufacturer's design does not consider the repair of spring assemblies in some areas during the maintenance phase. Due to structural limitations, the windshield cannot be removed in some areas, and the top screw hole area is inaccessible. Therefore, using traditional processes, spring assemblies in many areas cannot be repaired. It is necessary to provide a nuclear power plant steam turbine generator spring assembly maintenance device that can extend the spring assembly for repair to prevent the spring assembly failure from expanding and causing the nuclear power unit to shut down. Summary of the invention

[0005] The purpose of the present application is to provide a maintenance device for the spring assembly of a nuclear power plant steam turbine generator, so as to solve the problem that the windshield cannot be removed in some areas due to structural limitations, the top screw hole area is inaccessible, and the spring assembly cannot be repaired.

[0006] Technical solution to achieve the purpose of this application:

[0007] The present application provides a nuclear power plant steam turbine generator spring assembly maintenance device, the nuclear power plant steam turbine generator comprises: a stator pressure ring, a spring assembly, a fixed guide block and a fixed mounting seat; the fixed mounting seat is fixed on the stator pressure ring, the fixed mounting seat and the stator pressure ring form an installation cavity, the spring assembly and the fixed guide block are detachably arranged in the installation cavity; the device comprises: a power mechanism and a jacking mechanism;

[0008] The power mechanism is connected to the jacking and extending mechanism and is used to drive the jacking and extending mechanism to move;

[0009] The extension mechanism is detachably arranged in the gap between the spring assembly, the fixed guide block and the fixed mounting seat, and is used to apply a force to the spring assembly under the drive of the power mechanism, so that the spring assembly is stretched and straightened under the force applied by the extension mechanism.

[0010] Optionally, the lifting mechanism comprises: a lifting bar, a plunger and a first sealing member;

[0011] The first end of the plunger is telescopically disposed in the lifting bar to form an expandable cavity between the plunger and the lifting bar, and the second end of the plunger is in contact with the fixed mounting seat;

[0012] The first sealing member is disposed at a first end of the plunger for sealing the expandable cavity;

[0013] A connecting passage is provided in the lifting bar, a first end of the connecting passage is connected to the power mechanism, and a second end of the connecting passage is connected to the expandable cavity;

[0014] The power mechanism is used to drive the expandable cavity to expand and push the plunger out of the lifting bar; when the plunger is pushed out, the lifting bar contacts the spring assembly and applies a force to the spring assembly.

[0015] Optional,

[0016] The shape of the lifting mechanism matches the shape of the gap between the spring assembly, the fixed guide block and the fixed mounting seat.

[0017] Optionally, the lifting mechanism further includes: a connecting member and a second sealing member;

[0018] The connecting member is arranged at the first end of the connecting passage, and the power mechanism is sealed and connected with the connecting passage via the connecting member by means of the second sealing member;

[0019] The connecting piece is provided with a through hole which penetrates the connecting passage.

[0020] Optional,

[0021] The connecting piece is a connecting nut, and the power mechanism is connected to the connecting nut through threads.

[0022] Optional,

[0023] There are multiple plungers, and the multiple plungers are symmetrically arranged at both ends of the lifting bar to apply a balanced force to the lifting bar.

[0024] Optional,

[0025] The number of the jacking and extending mechanisms is two, and the two jacking and extending mechanisms are respectively arranged on both sides of the spring assembly.

[0026] Optional,

[0027] The length of the extension mechanism is the same as the length of the spring assembly.

[0028] Optional,

[0029] The power mechanism comprises: a driving pump and a delivery pipe;

[0030] The driving pump is connected to the pushing and extending mechanism via the delivery pipe, and is used for delivering a medium to the pushing and extending mechanism via the delivery pipe to drive the pushing and extending mechanism to move.

[0031] Optionally, when the number of the jacking and extending mechanisms is two, the power mechanism further includes: a distributor; the delivery pipe includes a first delivery pipe and two second delivery pipes;

[0032] The driving pump is connected to the input end of the distributor via the first delivery pipe, the two output ends of the distributor are respectively connected to the first ends of the two second delivery pipes, and the output ends of the two second delivery pipes are respectively connected to the two jacking mechanisms.

[0033] Optional,

[0034] The driving pump is a hydraulic pump.

[0035] The beneficial technical effects of this application are:

[0036] (1) The technical solution of utilizing the side space extension of the spring assembly and the leaf spring guide block adopted in the present application is not limited by the space of the generator stator structure, and solves the technical problem that the top screw area of ​​some spring assemblies in the traditional process is inaccessible and cannot be disassembled, thereby achieving the technical effect of comprehensive overhaul of this type of spring assembly.

[0037] (2) The present application can effectively prevent the expansion of spring component failure, thereby causing nuclear power generator unit failure and shutdown, and has obvious technical advantages over the traditional jacking screw extension method.

[0038] (3) This application innovatively uses a multi-link hydraulic plunger lifting method, where the six hydraulic plungers in each triangular bar are linked to greatly increase the lifting force.

[0039] (4) The present application is designed as a triangular lifting bar structure, which increases the lifting height of the hydraulic plunger within a limited space.

[0040] (5) The present application processes and manufactures an ultra-small high-pressure hydraulic plunger with a pressure resistance level of 55Mpa, which can increase the space by 6mm and set a limit within a limited space of 10mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic diagram of the structure of a nuclear power plant steam turbine generator spring assembly maintenance device provided in an embodiment of the present application;

[0042] Figure 2 A schematic diagram of the structure of another nuclear power plant steam turbine generator spring assembly maintenance device provided in an embodiment of the present application;

[0043] Figure 3 A structural schematic diagram of another nuclear power plant steam turbine generator spring assembly maintenance device provided in an embodiment of the present application;

[0044] Figure 4 A schematic structural diagram of another nuclear power plant steam turbine generator spring assembly maintenance device provided in an embodiment of the present application.

[0045] In the figure:

[0046] 1- stator pressure ring;

[0047] 2- Spring assembly;

[0048] 3-Fixed guide block;

[0049] 4-Fixed mounting base;

[0050] 5-power mechanism; 51-driving pump; 52-delivery pipe; 53-distributor;

[0051] 6-lifting mechanism; 61-lifting bar; 62-plunger; 63-first sealing member; 64-connecting passage; 65-connecting member; 66-second sealing member; 67-expandable cavity. DETAILED DESCRIPTION

[0052] In order to make those skilled in the art better understand the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the embodiments described below are only a part of the embodiments of the present application, not all. Based on the embodiments recorded in the present application, all other embodiments obtained by those skilled in the art without paying creative work are within the scope of protection of the present application.

[0053] The inventors of the present application discovered during their research that in order to deal with a fault in a steam turbine generator spring assembly, the spring assembly needs to be removed for repair. The traditional disassembly and assembly process involves removing the windshield on the back of the spring assembly and using a top screw to extend the leaf spring to release its elastic properties. However, during the generator manufacturing phase, some stator components are installed after the spring assembly is installed, and the manufacturer's design does not take into account the repair of spring assemblies in some areas during the overhaul phase. Due to structural limitations, the windshield in some areas cannot be removed, and the top screw hole area is inaccessible. Therefore, using traditional processes, the spring assembly cannot be repaired in many areas, and it is necessary to provide a nuclear power plant steam turbine generator spring assembly repair device that can extend and repair the spring assembly to prevent the spring assembly failure from expanding and causing the nuclear power unit to shut down.

[0054] In view of the technical deficiency that the traditional spring assembly disassembly and assembly process is restricted by many conditions and cannot repair all spring assemblies, the present application provides a nuclear power plant steam turbine generator spring assembly repair device and method, which utilizes the limited space between the spring assembly and the spring guide block to release the spring elastic performance, thereby achieving the purpose of repairing the spring assemblies in all areas of the generator end, ensuring the safe and stable operation of the nuclear power unit.

[0055] Based on the above content, in order to clearly and in detail illustrate the above advantages of the present application, the specific implementation methods of the present application will be described below in conjunction with the accompanying drawings.

[0056] See also Figure 1 , which is a structural schematic diagram of a nuclear power plant steam turbine generator spring assembly maintenance device provided in an embodiment of the present application.

[0057] The embodiment of the present application provides a nuclear power plant steam turbine generator spring assembly maintenance device, which is applied to nuclear power plant steam turbine generators. Figure 1 As shown, the nuclear power plant steam turbine generator includes: a stator pressure ring 1, a spring assembly 2, a fixed guide block 3 and a fixed mounting seat 4; the fixed mounting seat 4 is fixed on the stator pressure ring 1, and the fixed mounting seat 4 and the stator pressure ring 1 form an installation cavity, and the spring assembly 2 and the fixed guide block 3 are detachably arranged in the installation cavity.

[0058] In practical applications, the spring assembly 2 and the fixed guide block 3 are detachably installed in the installation cavity formed by the fixed mounting seat 4 and the stator pressure ring 1 in the form of shape matching, and there is a certain gap between the spring assembly 2, the fixed guide block 3 and the fixed mounting seat 4.

[0059] The nuclear power plant steam turbine generator spring assembly maintenance device comprises: a power mechanism 5 and a top extension mechanism 6;

[0060] The power mechanism 5 is connected to the jacking and extending mechanism 6, and is used to drive the jacking and extending mechanism 6 to move;

[0061] The extension mechanism 6 is detachably arranged in the gap between the spring assembly 2, the fixed guide block 3 and the fixed mounting seat 4, and is used to apply a force to the spring assembly 2 under the drive of the power mechanism 5, so that the spring assembly 2 is stretched straight under the force applied by the extension mechanism 6.

[0062] The technical solution of utilizing the space between the spring assembly, the fixed guide block and the fixed mounting seat adopted in the present application is not limited by the space of the generator stator structure, solves the technical problem that the top screw area of ​​some spring assemblies in traditional processes is inaccessible and cannot be disassembled, and achieves the technical effect of comprehensive overhaul of this type of spring assembly.

[0063] In some possible implementations of the present application, such as Figure 2 As shown, the lifting mechanism 6 may include: a lifting bar 61, a plunger 62 and a first sealing member 63;

[0064] The first end of the plunger 62 is telescopically disposed in the lifting bar 61 for forming an expandable cavity 67 between the plunger 62 and the lifting bar 61, and the second end of the plunger 62 is in contact with the fixed mounting seat 4;

[0065] A first sealing member 63 is disposed at a first end of the plunger 62 for sealing the expandable cavity 67;

[0066] A connecting passage 64 is provided in the lifting bar 61, a first end of the connecting passage 64 is connected to the power mechanism 5, and a second end of the connecting passage 64 is connected to the expandable cavity 67;

[0067] The power mechanism 5 is used to drive the expandable cavity 67 to expand, and push the plunger 62 out of the lifting bar 61; when the plunger 62 is pushed out, the lifting bar 61 contacts the spring assembly 2 and applies a force to the spring assembly 2.

[0068] As an example, the first sealing member 63 may be a sealing rubber ring.

[0069] It is understandable that the power mechanism 5 can expand the expandable cavity by injecting a medium into the expandable cavity through the connecting passage 64, so that the expandable cavity expands and pushes the plunger 62 out of the lifting bar 61. In practical applications, the medium can be gas or liquid, such as air, water, oil, etc., which is not limited in the embodiment of the present application.

[0070] In some possible implementations of the embodiments of the present application, the shape of the extension mechanism 6 may match the shape of the gap between the spring assembly 2 , the fixed guide block 3 and the fixed mounting seat 4 .

[0071] For example, the shape of the extending mechanism 6 can be consistent with the gap between the spring assembly 2, the fixed guide block 3 and the fixed mounting seat 4, so that the extending mechanism 6 can be tightly inserted into the gap between the spring assembly 2, the fixed guide block 3 and the fixed mounting seat 4; it can also be inconsistent with the gap between the spring assembly 2, the fixed guide block 3 and the fixed mounting seat 4, as long as it can apply a force to the spring assembly 2, and there is no limitation here.

[0072] For example, the shape of the lifting mechanism 6 can be a triangle.

[0073] In some possible implementations of the present application, see Figure 3 The jacking machine 6 may further include: a connecting member 65 and a second sealing member 66;

[0074] The connecting member 65 is disposed at the first end of the connecting passage 64, and the power mechanism 5 is sealed and connected to the connecting passage 64 via the connecting member 65 by means of a second sealing member 66;

[0075] The connecting member 65 is provided with a through hole which penetrates the connecting passage 64 .

[0076] As an example, the second sealing member 66 may be a sealing gasket, the connecting member 65 may be a connecting nut, the power mechanism 5 and the connecting nut are connected by threads, and a sealing gasket is installed between the two. The connecting nut has an oil hole connected to the connecting passage 64.

[0077] For example, the connecting nut is designed to be a sealing structure combined with the power mechanism 5 , with an opening on one side corresponding to the position of the hole of the connecting passage 64 , and an edge welded to the lifting bar 61 .

[0078] In some possible implementations of the present application, see Figure 3 The number of the plungers 62 can be multiple, and the multiple plungers 62 are symmetrically arranged at both ends of the lifting bar 61 to apply a balanced force to the lifting bar 61.

[0079] For example Figure 3 As shown, the number of plungers 62 is 6, which are evenly and symmetrically arranged at both ends of the lifting bar 61. The 6 plungers apply a balanced force to the lifting bar 61, pushing the lifting bar 61 upward so that the lifting bar 61 applies a force to the spring assembly 2. In actual applications, the number of plungers 62 can be set according to actual needs, and they are not listed here one by one.

[0080] In some possible implementations of the present application, see Figure 1 There are two pushing-out mechanisms 6, which are respectively arranged on both sides of the spring assembly 2, and apply force to both sides of the spring assembly 2 at the same time, so that the spring assembly 2 stretches straight and releases its elastic properties.

[0081] In some examples, the length of the extension mechanism 6 is the same as the length of the spring assembly 2 .

[0082] In some possible implementations of the present application, see Figure 4 , the power mechanism 5 comprises: a driving pump 51 and a delivery pipe 52;

[0083] The driving pump 51 is connected to the pushing and extending mechanism 6 via the delivery pipe 52 , and is used for delivering the medium to the pushing and extending mechanism 6 via the delivery pipe 52 to drive the pushing and extending mechanism 6 to move.

[0084] In some examples, the delivery pipe 52 is a hose that can withstand high-pressure oil, one end of the joint is designed to be a sealing structure combined with the joint of the drive pump 51, and the other end of the joint is designed to be a sealing structure combined with a connecting nut.

[0085] It can be understood that when the number of the jacking and extending mechanisms 2 is two, the power mechanism 5 may further include: a distributor 53; the delivery pipe 52 includes a first delivery pipe and two second delivery pipes;

[0086] The driving pump 51 is connected to the input end of the distributor 53 via the first delivery pipe. The two output ends of the distributor 53 are respectively connected to the first ends of the two second delivery pipes. The output ends of the two second delivery pipes are respectively connected to the two jacking mechanisms 6.

[0087] In some examples, the drive pump 51 is a hydraulic pump.

[0088] The present application can effectively prevent the expansion of spring component failures, thereby causing nuclear power generator unit failure and shutdown, and has obvious technical advantages over the traditional jacking screw extension method.

[0089] This application innovatively uses a multi-link hydraulic plunger lifting method, and the linkage of six hydraulic plungers in each triangular bar greatly improves the lifting force strength.

[0090] The present application is designed as a triangular lifting bar structure, which increases the lifting height of the hydraulic plunger in a limited space.

[0091] The present application processes and manufactures an ultra-small high-pressure hydraulic plunger with a pressure resistance level of 55Mpa, which can increase the space by 6mm and set a limit within a limited space of 10mm.

[0092] The present application is described in detail above in conjunction with the accompanying drawings and embodiments, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present application. Any content not described in detail in the present application can adopt the existing technology.

Claims

1. A nuclear power plant steam turbine generator spring assembly maintenance device, characterized in that: The nuclear power plant steam turbine generator comprises: a stator pressure ring, a spring assembly, a fixed guide block and a fixed mounting seat; the fixed mounting seat is fixed on the stator pressure ring, the fixed mounting seat and the stator pressure ring form a mounting cavity, the spring assembly and the fixed guide block are detachably arranged in the mounting cavity; the device comprises: a power mechanism and a jacking mechanism; The power mechanism is connected to the jacking and extending mechanism and is used to drive the jacking and extending mechanism to move; The extension mechanism is detachably arranged in the gap between the spring assembly, the fixed guide block and the fixed mounting seat, and is used to apply a force to the spring assembly under the drive of the power mechanism, so that the spring assembly is stretched and straightened under the force applied by the extension mechanism.

2. The nuclear power plant steam turbine generator spring assembly maintenance device according to claim 1, characterized in that: The lifting mechanism comprises: a lifting bar, a plunger and a first sealing member; The first end of the plunger is telescopically disposed in the lifting bar to form an expandable cavity between the plunger and the lifting bar, and the second end of the plunger is in contact with the fixed mounting seat; The first sealing member is disposed at a first end of the plunger for sealing the expandable cavity; A connecting passage is provided in the lifting bar, a first end of the connecting passage is connected to the power mechanism, and a second end of the connecting passage is connected to the expandable cavity; The power mechanism is used to drive the expandable cavity to expand and push the plunger out of the lifting bar; when the plunger is pushed out, the lifting bar contacts the spring assembly and applies a force to the spring assembly.

3. The nuclear power plant steam turbine generator spring assembly maintenance device according to claim 2, characterized in that: The shape of the lifting mechanism matches the shape of the gap between the spring assembly, the fixed guide block and the fixed mounting seat.

4. The nuclear power plant steam turbine generator spring assembly maintenance device according to claim 2, characterized in that: The jacking mechanism further includes: a connecting member and a second sealing member; The connecting member is arranged at the first end of the connecting passage, and the power mechanism is sealed and connected with the connecting passage via the connecting member by means of the second sealing member; The connecting piece is provided with a through hole which penetrates the connecting passage.

5. The nuclear power plant steam turbine generator spring assembly maintenance device according to claim 4, characterized in that: The connecting piece is a connecting nut, and the power mechanism is connected to the connecting nut through threads.

6. The nuclear power plant steam turbine generator spring assembly maintenance device according to claim 2, characterized in that: There are multiple plungers, and the multiple plungers are symmetrically arranged at both ends of the lifting bar to apply a balanced force to the lifting bar.

7. The nuclear power plant steam turbine generator spring assembly maintenance device according to any one of claims 1 to 6, characterized in that: The number of the jacking and extending mechanisms is two, and the two jacking and extending mechanisms are respectively arranged on both sides of the spring assembly.

8. The nuclear power plant steam turbine generator spring assembly maintenance device according to any one of claims 1 to 6, characterized in that: The length of the extension mechanism is the same as the length of the spring assembly.

9. The nuclear power plant steam turbine generator spring assembly maintenance device according to any one of claims 1 to 6, characterized in that: The power mechanism comprises: a driving pump and a delivery pipe; The driving pump is connected to the pushing and extending mechanism via the delivery pipe, and is used for delivering a medium to the pushing and extending mechanism via the delivery pipe to drive the pushing and extending mechanism to move.

10. The nuclear power plant steam turbine generator spring assembly maintenance device according to claim 9, characterized in that: When the number of the jacking and extending mechanisms is two, the power mechanism further comprises: a distributor; the delivery pipe comprises a first delivery pipe and two second delivery pipes; The driving pump is connected to the input end of the distributor via the first delivery pipe, the two output ends of the distributor are respectively connected to the first ends of the two second delivery pipes, and the output ends of the two second delivery pipes are respectively connected to the two jacking mechanisms.

11. The nuclear power plant steam turbine generator spring assembly maintenance device according to claim 10, characterized in that: The driving pump is a hydraulic pump.

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