RU2789393C1 - Npp turbogenerator spring block repair device - Google Patents

Abstract

FIELD: nuclear power plants.

SUBSTANCE: invention relates to a device for repairing the spring block of a turbogenerator of a nuclear power plant. A device that includes a power mechanism and a jacking mechanism. Said power mechanism is connected to the jacking mechanism and is used to drive the jacking mechanism. The jacking mechanism is removable and located in the gap between the spring block, the fixed guide block and the fixed mounting bracket, and is used to apply force to the spring block under the driving action of the power mechanism, so that the spring block expands under the force applied by the jacking mechanism. The device uses a hood design with a side space of a spring block and a leaf spring guide block without spatial restrictions of the generator stator design.

EFFECT: invention provides the possibility of carrying out a complete repair of the spring block of the turbogenerator of a nuclear power plant in cases where the spring block in the area of the lifting screw is inaccessible and cannot be dismantled by traditional technology.

11 cl, 4 dwg

Description

Technical field

This claimed invention relates to the field of repair of a generator, specifically to a device for repairing a spring block of a nuclear power plant turbogenerator.

State of the art

During operation of the generator, due to the interaction of the stator winding current and the end stray magnetic field, a larger vibration force with a double frequency (100 Hz) can be formed. Therefore, at the end of the generator stator, a spring block structure is provided to absorb and relieve vibration stress between the stator clamp ring, cone ring and other components.

Due to the inherent design and manufacturing deficiencies of the turbogenerator, the natural frequency of the elliptical oscillation shape at the end of the stator does not meet the requirements when it leaves the factory, and is constantly in the range of 10 ⁷ Hz—10 ⁹ Hz. It is because this stator has a natural frequency that is approximately twice the frequency and the corresponding waveform is elliptical, hence the end winding will resonate or vibrate strongly when subjected to electromagnetic interference. Large vibrational amplification repeatedly led to generator failures, such as falling out of the fastener of the spring block, wear of the leaf spring, wear of the compensator, etc.

To eliminate the above malfunction of the spring block, it is necessary to dismantle the spring block and repair it. The traditional disassembly and reassembly process is to remove the windshield on the back of the spring block, pull out the leaf springs using the lifting screw to release their resilience. But part of the stator components at the generator manufacturing stage was installed after the spring blocks had already been installed. When designing, the manufacturer did not take into account the repair of the spring in some areas at the repair stage. In some areas, the wind shield cannot be removed due to design limitations, and the lift screw hole area is not accessible. Thus, when using conventional technology, the spring block in many areas cannot be repaired. It is necessary to provide a device for repairing the spring blocks of the turbogenerator of a nuclear power plant, which allows repairing the spring block by drawing without dismantling the spring block, in order to prevent the development of defects in the spring block, causing the shutdown of the nuclear power plant due to a malfunction.

Disclosure of invention

The technical problem to be solved by the present invention is to provide a device for repairing the spring block of a nuclear power plant turbine generator, which solves the problems of the impossibility of repairing the spring block associated with the impossibility of removing the windshield in some areas due to design limitations and the inaccessibility of the lifting screw hole.

The technical solution of this invention is described below:

The present claimed invention proposes a device for repairing spring blocks of a nuclear power plant turbogenerator. The NPP turbine generator includes: a stator clamping ring, a spring block, a fixed guide block and a fixed mounting bracket. The fixed mounting bracket is fixed on the stator clamping ring, a mounting cavity is formed between the fixed mounting bracket and the stator clamping ring, and the spring block and the fixed guide block are located in the mounting cavity with the possibility of removal. Said device includes a power mechanism and a jacking mechanism.

The stated power mechanism is connected to the jacking mechanism and is used to set the jacking mechanism in motion.

Said removable jacking mechanism is located in the gap between the spring block, the fixed guide block and the fixed mounting bracket, and is used to apply force to the spring block under the driving action of the power mechanism so that the spring block expands under the force applied by the jacking mechanism.

As a possible choice (option), said jacking mechanism includes a lifting bar, a plunger and a first sealing element.

The specified first end of the plunger is telescopically located 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 bracket.

Said first sealing element is located at the first end of the plunger and is used to seal the expandable cavity.

Said lifting bar is provided with a connecting channel, the first end of which is connected to the power mechanism, and the second end of the connecting channel is connected to the expandable cavity.

Said power mechanism is used to bring the expandable cavity into expansion and push the plunger out of the lifting bar. The lift bar is in contact with the spring block when the plunger is pushed out, and applies force to the spring block.

As a possible choice (optional), the shape of said jack mechanism matches the shape of the gap between the spring block, the fixed guide block and the fixed mounting bracket.

As a possible choice (option), said jacking mechanism also includes a connecting piece and a second sealing element.

The specified connecting part is located at the first end of the connecting channel, and the power mechanism is connected to the connecting channel through the connecting part hermetically by means of the second sealing element.

The specified connecting part has a through hole passing through the connecting channel.

As a possible choice (option), the specified connecting part is a connecting nut, the power mechanism and the connecting nut are connected by a thread.

As a possible choice (option), the number of these plungers is several pieces, and these plungers are located symmetrically at the two ends of the lifting bar to apply equilibrium forces to the lifting bar.

As a possible choice (option), the number of said jacking mechanisms is two, and these two jacking mechanisms are located on two sides of the spring block, respectively.

As a possible choice (option), the length of the specified jacking mechanism is equal to the length of the spring block.

As a possible choice (option), the specified power mechanism includes a drive pump and a supply tube.

Said driving pump is connected to the jacking mechanism through the feed tube and is used to supply the medium to the jacking mechanism through the feed tube to drive the jacking mechanism.

As a possible choice (option), when the number of said jacking mechanisms is two, the power mechanism still includes a distributor; the above supply tubes include a primary tube and two secondary tubes.

Said drive pump is connected to the inlet end of the distributor through the primary tube, and the two outlet ends of the distributor are respectively connected to the first ends of the two secondary tubes, and the two outlet ends of the above secondary tubes are connected to two jacking mechanisms, respectively.

As a possible choice (option), the specified drive pump is a hydraulic pump.

Useful technical results of this claimed invention are as follows:

(1) The technical solution of the hood using the space between the spring block and the leaf spring guide block adopted in this application solves the technical issue related to the inaccessibility of the spring block in the area of the lifting screw and the impossibility of dismantling the spring block by traditional technology, without being subject to spatial design restrictions generator stator, and achieve a technical result - a complete repair of this type of spring blocks.

(2) This claimed invention can effectively prevent the development of a failure of the spring unit, which will lead to failure and shutdown of the nuclear power plant, and has obvious technical advantages over the traditional lifting screw drawing method.

(3) In this application, an innovative multi-hydraulic ram lifting method is used, and the group movement of six hydraulic rams in each triangular element greatly increases the lifting force.

(4) This inventive design solution is made in the form of a triangular lifting bar, which increases the lifting height of the hydraulic ram in a limited space.

(5) The invention in this application makes it possible to manufacture a subminiature high pressure hydraulic plunger with a nominal pressure of 55 MPa, which can rise 6 mm in a limited space of 10 mm and with a limit setting.

Brief description of the attached schemes

Fig. 1 is a structural diagram of a device for repairing the spring block of a NPP turbogenerator, presented as an example for the implementation of this application;

Fig. 2 is a structural diagram of another device for repairing the spring block of a nuclear power plant turbine generator, presented as another example for the implementation of this application;

Fig. 3 is a structural diagram of a device for repairing the spring block of a NPP turbogenerator, presented as another example for the implementation of this application;

Fig. 4 is a structural diagram of another device for repairing the spring block of a nuclear power plant turbine generator, presented as another example for the implementation of this application.

List of positions:

1 - Clamping ring of the stator;

2 - Spring block;

3 - Fixed guide block;

4 - Fixed mounting bracket;

5 - Power mechanism;

6 - Jacking mechanism;

51 - Drive pump;

52 - Feeding tube;

53 - Distributor;

61 - Lifting bar;

62 - Plunger;

63 - First sealing element;

64 - Connecting channel;

65 - Connecting piece;

66 - Second sealing element;

67 - Expandable cavity.

Implementation of the invention

In order for those skilled in the art to better understand the present application, examples of technical solutions for the implementation of this application will be described clearly and completely using the attached diagrams for examples of the implementation of this application. Obviously, the examples of implementations described below are only a part of the implementations of the present application, and not all of the options. All other implementations obtained by those skilled in the art based on the exemplary embodiments described in this application, without creative work, are within the protection scope of this application.

The inventor of the present application noted during the study that in order to eliminate the failure of the spring block of the turbogenerator, it is necessary to remove the spring block for repair. The traditional disassembly and reassembly process is to remove the windshield on the back of the spring block, and pull out the leaf spring with a lifting screw to release its elastic properties. However, some of the stator components were installed at the generator manufacturing stage after the spring block had already been installed. The manufacturer did not take into account the repair of the spring block in some areas at the repair stage. In some areas, the windshield cannot be removed due to design limitations and the lift screw hole area is not accessible. Therefore, with the traditional technology, the spring block cannot be repaired in many areas, and a nuclear power plant turbine generator spring block repair device must be provided that allows the spring block to be repaired with a jack to prevent the spring block from developing into a failure that will lead to a stop. power unit of a nuclear power plant due to a malfunction.

In view of the technical imperfection with multiple limitations of the traditional spring block disassembly and assembly technology and the impossibility of repairing all spring blocks, this application proposes a device and method for repairing spring blocks of a nuclear power plant turbine generator generator, which uses the limited space between the spring block and the guide spring block to release elastic characteristics springs, thus achieving the goal of repairing spring blocks in all areas at the end of the generator and ensuring the safe and stable operation of the nuclear power plant.

Based on the foregoing, in order to clearly and in detail describe the aforementioned advantages of the present application, specific methods for implementing the present application are described below with reference to the attached diagrams.

See fig. 1, which is a structural diagram of a device for repairing the spring block of a NPP turbogenerator, presented as an example of the implementation of this application.

An example-variant for the implementation of this application proposes a device for repairing the spring block of a nuclear power plant turbogenerator, which is applied to a nuclear power plant turbogenerator. As shown in FIG. 1, the NPP turbogenerator includes: a stator clamping ring (pos.1), a spring block (pos.2), a fixed guide block (pos.3) and a fixed mounting bracket (pos.4). The fixed mounting bracket (pos.4) is fixed on the stator clamping ring (pos.1), the fixed mounting bracket (pos.4) and the stator clamping ring (pos.1) form the mounting cavity, and the spring block (pos.2) and the fixed the guide block (pos.3) are located in the mounting cavity with the possibility of removal.

In practice, the spring block 2 and the fixed guide block 3 can be removable and installed in the mounting cavity formed by the fixed mounting bracket 4 and the stator clamping ring 1 by matching their shape, and between the spring block 2 and the fixed guide block 3 and the fixed mounting bracket 4 there is a certain gap.

A device for repairing the spring block of a NPP turbogenerator includes: a power mechanism 5 and a jack mechanism 6;

The power mechanism 5 is connected to the jack mechanism 6 to drive the jack mechanism 6.

The jacking mechanism 6 is installed with the possibility of removal in the gap between the spring block 2, the fixed guide block 3 and the fixed mounting bracket 4, and is used to apply force to the spring block 2 under the action of the power mechanism 5 so that the spring block 2 expands under the force applied by the jacking mechanism 6.

The technical solution of the hood using the space between the spring block, the fixed guide block and the fixed mounting bracket, adopted in this application, is not limited to the structural space of the generator stator and solves the technical issue with the inaccessibility and the inability to remove part of the spring block in the area of the lifting screw using traditional technology , which allows to achieve a technical result - a complete repair of this type of spring block.

In some possible implementations of the embodiments of the present application, as shown in FIG. 2, the jacking mechanism 6 may include: a lifting bar 61, a plunger 62, and a first sealing member 63;

The first end of the plunger 62 is telescopically positioned in the riser bar 61 to form an expandable cavity 67 between the plunger 62 and the riser bar 61, and the second end of the plunger 62 is in contact with the fixed mounting bracket 4.

The first sealing element 63 is located at the first end of the plunger 62 to seal the expandable cavity 67.

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

The power mechanism 5 is used to bring into the expansion of the expandable cavity 67 and push the plunger 62 out of the lifting bar 61; When plunger 62 is pushed out, lift bar 61 contacts spring block 2 and applies force to spring block 2.

For example, the first sealing element 63 may be a rubber sealing ring.

It is understood that the force mechanism 5 may introduce a medium into the expandable cavity through the connection channel 64 so that the expandable cavity expands and pushes the plunger 62 out of the lift bar 61. In practice, the medium may be gaseous or liquid, such as air, water, oil, etc. ., which is not limited to the embodiments of the present application.

In some possible implementations in the embodiments of the present application, the shape of the lifting mechanism 6 may correspond to the shape of the gap between the spring block 2, the fixed guide block 3 and the fixed mounting bracket 4.

For example, the shape of the jack mechanism 6 may correspond to the gap between the spring block 2, the fixed guide block 3 and the fixed mounting bracket 4 so that the jack mechanism 6 can be firmly inserted into the gap between the spring block 2, the fixed guide block 3 and the fixed mounting bracket. The shape of the jacking mechanism 6 may also not correspond to the gap between the spring block 2, the fixed guide block 3 and the fixed mounting bracket 4, only it needs to be able to apply force to the spring block 2. Here, the shape of the jacking mechanism 6 is not specified.

For example, the jack mechanism 6 may be triangular.

In some possible ways of implementing the embodiments of the present application, see figure 3, the jacking mechanism 6 may also include: a connecting piece 65 and a second sealing element 66.

The connecting piece 65 is located at the first end of the connecting channel 64, and the power mechanism 5 is hermetically connected to the connecting channel 64 through the connecting piece 65 by means of the second sealing element 66.

The connecting part 65 is provided with a through hole passing through the connecting channel 64.

By way of example, the second sealing element 66 may be a gasket and the fitting 65 may be a union nut. The power mechanism 5 and the connecting nut are threaded, and a sealing gasket is installed between them. The connecting nut has an oil hole and connects with the connecting channel 64.

For example, the connecting nut is made in the form of a sealing structure in combination with the power mechanism 5, on one side there is a hole corresponding to the position of the hole in the connecting channel 64, and the edge is welded to the lifting bar 61.

In some possible ways of implementing embodiments of the present application, see figure 3, the number of plungers 62 may be multiple, and these plungers 62 are located symmetrically at the two ends of the lift bar 61 to apply an equilibrium force to the lift bar 61.

For example, as shown in Figure 3, the number of plungers 62 is six, and they are located symmetrically at the two ends of the lift bar 61. The six plungers apply a balanced force to the lift bar 61 to lift it so that it exerts force on the spring block 2. In practice the number of plungers 62 may be determined according to actual needs, and no further examples will be given here.

In some possible ways of implementing embodiments of the present application, see figure 1, the number of jacking mechanism 6 is two, and two jacking mechanisms 6 are located on two sides of the spring block 2, respectively, they simultaneously apply force to both sides of the spring block 2 and force the spring block 2 straighten out to release its elastic characteristics.

In some examples, the length of the jack mechanism 6 is equal to the length of the spring block 2.

In some possible ways of implementing an embodiment of the present application, see Fig.4, the power mechanism 5 includes a drive pump 51 and a supply tube 52.

The driving pump 51 is connected to the jacking mechanism 6 through the supply pipe 52 and is used to supply the medium to the jacking mechanism 6 through the supply pipe 52 to drive the jacking mechanism 6.

In some examples, the supply tube 52 is a hose that can withstand high pressure oil pressure, the connection at one end is made in the form of a sealing structure in combination with the drive pump connector 51, and the connection at the other end is made in the form of a sealing structure in combination with a union nut .

It can be understood that when the number of the jacking mechanism 2 is two, the power mechanism 5 may also include a distributor 53. The feed tube 52 includes one primary tube and two secondary tubes.

The drive pump 51 is connected to the inlet end of the distributor 53 through the primary tube. The two outlet ends of the distributor 53 are respectively connected to the first ends of the two secondary tubes, and the outlet ends of the two secondary tubes are connected to the two jack mechanisms 6, respectively.

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

This application can effectively prevent the development of a spring block failure leading to a shutdown due to a failure of a nuclear power plant, and has obvious technical advantages over the traditional lifting screw drawing method.

This application innovatively utilizes the multi-plunger hydraulic ram lifting method, and the combined action of the six hydraulic rams in each triangular bar greatly increases the lifting force.

This application is designed as a lifting bar having a triangular design which increases the lifting height of hydraulic rams in a limited space.

This application makes it possible to manufacture a subminiature high pressure hydraulic plunger with a nominal pressure of 55 MPa, which can lift 6 mm in a limited space of 10 mm with a limit setting.

This application has been described in detail above with reference to figures and exemplary embodiments, but this application is not limited to the above-mentioned exemplary embodiments. The amount of knowledge possessed by those skilled in the art can be varied without deviating from the gist of this application. For any content not described in detail in this application, existing technology can be used.

Claims (19)

1. A device for repairing a spring block of a turbogenerator of a nuclear power plant, characterized in that the turbogenerator of a nuclear power plant includes: a stator clamping ring, a spring block, a fixed guide block and a fixed mounting bracket, while said fixed mounting bracket is fixed on the stator clamping ring, and this fixed mounting bracket and the stator's clamping ring forms a cavity for installation, and the indicated spring block and the motionless guide block are installed in this mounting cavity with the possibility of removal, the above device includes the power mechanism and the jack mechanism, and the power mechanism is connected to the specified jam mechanism and is used to bring a jack the mechanism in motion, and the specified jack mechanism is removable and is located in the gap between the spring block, a fixed guide block and a fixed mounting bracket, and is used to apply force on the spring unit under the leading effect of forces new mechanism so that the spring block is straightened out under the influence of the force applied by the jacking mechanism. 2. The device according to claim 1, characterized in that said jacking mechanism includes a lifting bar, a plunger and a first sealing element; the specified first end of the plunger is telescopically located 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 a fixed mounting bracket; The specified first sealing element is located at the first end of the plunger and is used to compact an expanded cavity; said lifting bar is provided with a connecting channel, the first end of the connecting channel is connected to the power mechanism, and the second end of the connecting channel is connected to the expandable cavity; said power mechanism is used to bring the expandable cavity into expansion and push the plunger out of the lifting bar; the lift bar is in contact with the spring block when the plunger is pushed out and applies force to the spring block. 3. The device according to claim 2, characterized in that the shape of said jacking mechanism corresponds to the shape of the gap between the spring block, the fixed guide block and the fixed mounting bracket. 4. The device according to claim 2, characterized in that said jacking mechanism also includes a connecting piece and a second sealing element; the specified connecting element is located at the first end of the connecting channel, and the power mechanism is connected to the connecting channel through the connecting element hermetically using the second sealing element; the specified connecting element has a through hole passing through the connecting channel. 5. The device according to claim 4, characterized in that said connecting part is a connecting nut, and the power mechanism and the connecting nut are connected by a thread. 6. The device according to claim 2, characterized in that the number of said plungers is several pieces, and these plungers are located symmetrically at the two ends of the lifting bar for applying equilibrium forces to the lifting bar. 7. The device according to any one of claims 1 to 6, characterized in that the number of said jacking mechanisms is two, and these two jacking mechanisms are located on two sides of the spring block, respectively. 8. The device according to claim 6, characterized in that the length of the specified jacking mechanism is equal to the length of the spring block. 9. The device according to any one of claims 1 to 6, characterized in that said power mechanism includes a drive pump and a supply tube, said driving pump is connected to the jacking mechanism through the feed tube and is used to supply the medium to the jacking mechanism through the feed tube to drive the jacking mechanism. 10. The device according to claim 9, characterized in that when the number of said jack mechanisms is equal to two, the power mechanism still includes a distributor; the above supply tube includes one primary tube and two secondary tubes, said driving pump is connected to the inlet end of the distributor through the primary tube, and the two outlet ends of the distributor are connected to the first ends of the two secondary tubes, respectively, and the two outlet ends of the above secondary tubes are connected to two jacking mechanisms, respectively. 11. Device according to claim 10, characterized in that said drive pump is a hydraulic pump.

Images