Large-scale steam turbine generator stator core vibration on-line measuring device

Abstract

The invention relates to the field of steam-turbine generators, and discloses a large-scale steam-turbine generator stator core vibration on-line measurement device. The device is composed of a left half iron core dove tail fixing seat, a right half iron core dove tail fixing seat, an iron core vibration element cover, a fastening taper pin, an iron core vibration sensing element, an iron core vibration element cover fixing bolt, an iron core vibration sensing element sealing wire passing device, an iron core dove tail, a high-friction conformal material, a signal collector and an L-shaped positioning block. The large-scale steam turbine generator stator iron core vibration on-line measurement device has the function of effectively avoiding the occurrence of an iron core vibration fault through on-line measurement of the vibration of the large-scale steam turbine generator stator iron core.

Description

Technical Field

[0001] The invention relates to the field of steam turbine generators, and in particular to an online vibration measurement device for a stator core of a large steam turbine generator. Background Art

[0002] In recent years, with the rapid development of new energy in my country, the grid structure and operation characteristics of the power system have undergone tremendous changes. A new power system with a high proportion of new energy and a high proportion of power electronics as its main features is gradually taking shape. The proportion of new energy continues to increase, and the rapid consumption of power systems flexibly adjusts resources. Its intermittent, random, and volatile characteristics make system adjustment more difficult, and system balance and safety issues are more prominent. The improvement of system adjustment and support capabilities faces many constraints. The situation of new energy consumption is still severe. The regional grid is weak, and there is a lack of large-scale new energy bases supported by synchronous power sources. The system support capacity is insufficient, and the safe and reliable transmission of new energy is also affected. In the new power system, the flexible operation, peak regulation, voltage regulation, and phase regulation of large steam turbine generators will bring negative impacts and influences to the generators themselves. For example, under frequent and rapid deep peak regulation, the temperature of the stator core, coil, slot and end support components of large steam turbine generators changes dramatically, and the temperature and pressure of hydrogen in the machine are constantly changing and adjusting. The difference in material properties leads to thermal expansion differences, resulting in increased stress between structures, uneven thermal expansion changes, and large differences in deformation, which causes the stator core to loosen, fatigue, and dislocation, and then leads to loose structure in the stator slot, loose wear at the end, poor end winding slip, nose connection failure, and abnormal rotor turns and vibration. Under the comprehensive action of multiple physical fields, insulation accelerates aging and structure accelerates degradation. Online monitoring of the vibration state of the stator core can detect the state changes of the stator core in advance, avoid further aggravation of generator failures due to the failure to detect the looseness of the stator core in time, and has profound significance for the flexible operation of the generator.

[0003] At present, in order to solve the above problems, most of them use static detection methods, such as hammering method, such as patent "Stator core loosening diagnosis and stator core loosening diagnosis method" (200680042860.5), which has the advantage of being able to measure and diagnose the looseness of the stator core by effective means, and the disadvantage is that it can only guarantee the quality of the stator core in the manufacturing stage, and cannot meet the requirements of online measurement of the core vibration. In order to solve the safety problem of flexible operation of large steam turbine generators, reduce the negative impact and influence of peak regulation, voltage regulation, and phase regulation on the generator, and avoid further aggravation of generator failure due to failure to timely discover the looseness of the stator core, there is an urgent need for a component that can realize online measurement of the vibration of the stator core of large steam turbine generators. Summary of the invention

[0004] In view of this, the purpose of the present invention is to disclose an online measurement device for the stator core vibration of a large steam turbine generator, which is used to effectively avoid the occurrence of core vibration failures through online measurement of the stator core vibration of the large steam turbine generator.

[0005] The technical scheme of the present invention is: an online vibration measuring device for a large steam turbine generator stator core, which is composed of a left half-core dove tail fixing seat, a right half-core dove tail fixing seat, a core vibration sensing element cover, a fastening cone pin, a core vibration sensing element, a core vibration sensing element cover fixing bolt, a core vibration sensing element sealing wire passer, a core dove tail, a high-friction conformal material, a signal collector, an L-shaped positioning block, a core radial ventilation path and an expansion type fastening bolt; the left half-core dove tail fixing seat and the right half-core dove tail fixing seat are respectively placed in the core dove tail of the stator core without a core positioning rod installed on the back of the stator core, and the two inclined sides in contact with the core dove tail are padded with high-friction conformal materials; the left half-core dove tail fixing seat and the right half-core dove tail fixing seat are provided with inclined cone holes at both ends, and the fastening cone pins are coated with adhesive, and the fastening cone pins are driven into the inclined cone holes at both ends of the left half-core dove tail fixing seat and the right half-core dove tail fixing seat; the left half-core A groove for fixing the core vibration sensing element and an interface for tightening the core vibration sensing element cover are reserved on the top of the dove tail fixing seat and the right half iron core dove tail fixing seat. The core vibration sensing element is placed in the fixing groove, and the core vibration sensing element cover is tightened to the interface for tightening the core vibration sensing element cover on the top of the left half iron core dove tail fixing seat and the right half iron core dove tail fixing seat using the core vibration sensing element cover fixing bolts; a threading hole is reserved on the core vibration sensing element cover, and a wire passing groove is reserved on the top of the left half iron core dove tail fixing seat and the right half iron core dove tail fixing seat. The lead wire of the core vibration sensing element passes through the threading hole on the core vibration sensing element cover, passes through the wire passing groove on the top of the left half iron core dove tail fixing seat and the right half iron core dove tail fixing seat, and is led to the stator base partition; the core vibration sensing element sealed wire passer connected to the lead end of the core vibration sensing element passes through the partition of the stator base to the outside of the machine and is connected to the signal collector.

[0006] As a preferred embodiment, the left half-core dove tail fixing seat has a male stopper, the right half-core dove tail fixing seat has a female stopper, and the bottom width of the left half-core dove tail fixing seat and the right half-core dove tail fixing seat is narrower than the top width of the core dove tail.

[0007] As a preferred embodiment, after the left half-core dove tail fixing seat and the right half-core dove tail fixing seat are assembled, there is a gap between the two side slopes of the trapezoidal area formed in the core dove tail and the two side slopes of the core dove tail, and the gap position is filled with high friction conformable material.

[0008] As a preferred implementation, the width of the fastening cone pin is wider than the width of the inclined cone holes left at both ends of the left half-core dove tail fixing seat and the right half-core dove tail fixing seat.

[0009] As a preferred implementation manner, the fixing grooves for the core vibration sensing elements left on the tops of the left half-core dove tail fixing seat and the right half-core dove tail fixing seat match the size of the core vibration sensing elements.

[0010] As a preferred embodiment, there are no inclined tapered holes at both ends of the left half-core dove tail fixing seat and the right half-core dove tail fixing seat, the length dimensions of the left half-core dove tail fixing seat and the right half-core dove tail fixing seat match the axial length dimensions of the two iron core radial ventilation paths, and L-shaped positioning blocks are driven into the two iron core radial ventilation paths at both ends of the left half-core dove tail fixing seat and the right half-core dove tail fixing seat.

[0011] As a preferred embodiment, the left half-core dove tail fixing seat and the right half-core dove tail fixing seat do not have inclined tapered holes at both ends, and threaded holes are opened at both ends. Adhesive glue is coated on the expansion type fastening bolts, and the expansion type fastening bolts are screwed into the threaded holes at both ends of the left half-core dove tail fixing seat and the right half-core dove tail fixing seat.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] (1) The present invention uses effective means to ensure that the result measured by the core vibration sensing element is the actual vibration state of the stator core and is not affected by other external factors.

[0014] (2) The present invention ensures that the core vibration sensing element will not become loose as the generator runs by means of effective fixing means, and the structural reliability is high.

[0015] (3) The present invention can measure the vibration state of the core in various directions, such as axial and radial directions, online through effective means.

[0016] (4) The present invention can realize online measurement of the vibration state of the stator core through effective means. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a front view of an implementation method of an online vibration measurement device for a large steam turbine generator stator core.

[0018] Figure 2 The present invention is a side sectional view of an implementation method of an online vibration measurement device for a large steam turbine generator stator core.

[0019] Figure 3 The present invention is a side sectional view of an implementation method of an online vibration measurement device for a large steam turbine generator stator core.

[0020] Figure 4 The present invention is a side sectional view of one embodiment of an online vibration measurement device for a large steam turbine generator stator core.

[0021] Description of component numbers in the accompanying drawings:

[0022] 1-left half iron core dove tail fixing seat; 2-right half iron core dove tail fixing seat; 3-iron core vibration element cover; 4-fastening cone pin; 5-iron core vibration sensing element; 6-iron core vibration element cover fixing bolt; 7-iron core vibration sensing element sealing wire passer; 8-iron core dove tail; 9-high friction conformal material; 10-signal collector; 11-L-type positioning block; 12-iron core radial ventilation path; 13-expansion type fastening bolt. DETAILED DESCRIPTION

[0023] The technical solution of the present application is further described in detail below in conjunction with specific implementation methods. In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution 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 described embodiments are part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different structures.

[0024] like Figure 1 , Figure 2As shown, a large steam turbine generator stator core vibration online measuring device is composed of a left half core dove tail fixing seat 1, a right half core dove tail fixing seat 2, a core vibration sensing element cover 3, a fastening cone pin 4, a core vibration sensing element 5, a core vibration sensing element cover fixing bolt 6, a core vibration sensing element sealing wire passer 7, a core dove tail 8, a high friction conformal material 9, a signal collector 10, an L-shaped positioning block 11, a core radial ventilation path 12, and an expansion type fastening bolt 13. ; The left half-core dove tail fixing seat 1 and the right half-core dove tail fixing seat 2 are respectively placed in the core dove tail 8 on the back of the stator core without the core positioning rod installed, and the two inclined sides in contact with the core dove tail 8 are padded with high-friction conformal material 9; the left half-core dove tail fixing seat 1 and the right half-core dove tail fixing seat 2 are provided with inclined conical holes at both ends, and the fastening conical pin 4 is coated with adhesive, and the fastening conical pin 4 is driven into the inclined conical holes at both ends of the left half-core dove tail fixing seat 1 and the right half-core dove tail fixing seat 2; the left half-core The dove tail fixing seat 1 and the right half iron core dove tail fixing seat 2 have a groove for fixing the core vibration sensing element 5 and an interface for tightening the core vibration sensing element cover 3. The core vibration sensing element 5 is placed in the fixing groove, and the core vibration sensing element cover fixing bolt 6 is used to tighten the core vibration sensing element cover 3 to the interface for tightening the core vibration sensing element cover 3 on the top of the left half iron core dove tail fixing seat 1 and the right half iron core dove tail fixing seat 2; the core vibration sensing element cover 3 has a threading hole. Hole, the wire groove left on the top of the left half iron core dove tail fixing seat 1 and the right half iron core dove tail fixing seat 2, the lead wire of the core vibration sensing element 5 passes through the wire hole on the core vibration sensing element cover 3, passes through the wire groove on the top of the left half iron core dove tail fixing seat 1 and the right half iron core dove tail fixing seat 2, and is led to the stator base partition; the core vibration sensing element sealed wire passer 7 connected to the lead end of the core vibration sensing element 5 passes through the partition of the stator base and is led to the outside of the machine, and is connected to the signal collector 10.

[0025] Preferably, the left half-core dove tail fixing seat 1 has a male stopper, and the right half-core dove tail fixing seat 3 has a female stopper, and the bottom widths of the left half-core dove tail fixing seat 2 and the right half-core dove tail fixing seat 2 are narrower than the top width of the core dove tail 8, so that the left half-core dove tail fixing seat 1 and the right half-core dove tail fixing seat 2 can be conveniently placed into the core dove tail at any position of the core dove tail 8.

[0026] Preferably, after the left half-core dove tail fixing seat 1 and the right half-core dove tail fixing seat 2 are assembled, there is a gap between the two side slopes of the trapezoidal area formed in the core dove tail 8 and the two side slopes of the core dove tail 8, so that the left half-core dove tail fixing seat 1 and the right half-core dove tail fixing seat 2 are conveniently placed in the core dove tail and pushed to an aligned state, and the gap position is filled with a high-friction conformal material 9, which can ensure that the left half-core dove tail fixing seat 1, the right half-core dove tail fixing seat 2 are in full contact with the core dove tail 8 and improve the friction and tightness between the left half-core dove tail fixing seat 1, the right half-core dove tail fixing seat 2 and the core dove tail 8, so as to ensure that the result measured by the core vibration sensing element 5 is the real vibration state of the core.

[0027] Preferably, the width of the tightening cone pin 4 is wider than the width of the inclined tapered holes left at both ends of the left half-core dove tail fixing seat 1 and the right half-core dove tail fixing seat 2. After tightening, the left half-core dove tail fixing seat 1 and the right half-core dove tail fixing seat 2 can be tightly supported by the inclined surfaces on both sides of the core dove tail 8, and the friction force provided by the high-friction conformable material 9 can be used to firmly fix the left half-core dove tail fixing seat 1 and the right half-core dove tail fixing seat 2 in the core dove tail 8, and will not loosen with the operation of the generator.

[0028] Preferably, the fixing grooves of the core vibration sensing element left on the top of the left half-core dove tail fixing seat 1 and the right half-core dove tail fixing seat 2 match the size of the core vibration sensing element 5. By adjusting the size of the fixing grooves, the placement direction of the core vibration sensing element can be adjusted, and online measurement of the vibration state of the core in various directions such as axial and radial directions can be achieved.

[0029] Preferably, a core vibration sensing element sealing wire passer is installed at the end of the core vibration sensing element lead wire, which can achieve the sealing effect of the core vibration sensing element lead wire from inside to outside the machine and realize the function of online measurement of core vibration.

[0030] like Figure 3 As shown, an online measuring device for the stator core vibration of a large steam turbine generator, wherein the left half-core dove tail fixing seat 1 and the right half-core dove tail fixing seat 2 have no inclined tapered holes at both ends, and the length dimensions of the left half-core dove tail fixing seat 1 and the right half-core dove tail fixing seat 2 match the axial length dimensions of the two core radial ventilation paths 12, and L-shaped positioning blocks 11 are driven into the two core radial ventilation paths 12 at both ends of the left half-core dove tail fixing seat 1 and the right half-core dove tail fixing seat 2, and the friction force provided by the high-friction conformable material 9 is used to firmly fix the left half-core dove tail fixing seat 1 and the right half-core dove tail fixing seat 2 in the core dove tail 8, and will not loosen with the operation of the generator.

[0031] like Figure 4As shown, an online measurement device for the stator core vibration of a large steam turbine generator, wherein the left half-core dove tail fixing seat 1 and the right half-core dove tail fixing seat 2 do not have inclined tapered holes at both ends, but threaded holes are opened at both ends, and adhesive is coated on the expansion type fastening bolts 13, which are screwed into the threaded holes at both ends of the left half-core dove tail fixing seat 1 and the right half-core dove tail fixing seat 2, and the friction force provided by the high-friction conformable material 9 is used to firmly fix the left half-core dove tail fixing seat 1 and the right half-core dove tail fixing seat 2 in the core dove tail 8, and will not loosen with the operation of the generator.

[0032] Although the basic principles and main features of the present invention are described above in conjunction with the accompanying drawings, technicians in this industry should understand that the above embodiments do not limit the present invention in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. An online vibration measurement device for a large steam turbine generator stator core, characterized in that: The invention comprises a left half iron core dove tail fixing seat (1), a right half iron core dove tail fixing seat (2), an iron core vibration sensing element cover (3), a fastening cone pin (4), an iron core vibration sensing element (5), an iron core vibration sensing element cover fixing bolt (6), an iron core vibration sensing element sealing wire guide (7), an iron core dove tail (8), a high friction conformal material (9), a signal collector (10), an L-shaped positioning block (11), an iron core radial ventilation path (12) and an expansion type fastening bolt (13); the left half iron core dove tail fixing seat (1) and the right half iron core dove tail fixing seat (2), an iron core vibration sensing element cover fixing bolt (3), a fastening cone pin (4), an iron core vibration sensing element (5), an iron core vibration sensing element cover fixing bolt (6), an iron core vibration sensing element sealing wire guide (7), an iron core dove tail (8), a high friction conformal material (9), a signal collector (10), an L-shaped positioning block (11), an iron core radial ventilation path (12) and an expansion type fastening bolt (13). The half-core dovetail fixing seats (2) are respectively placed in the core dovetails (8) on the back of the stator core without the core positioning rod installed, and the two inclined sides contacting the core dovetails (8) are padded with high friction conformal materials (9); the left half-core dovetail fixing seat (1) and the right half-core dovetail fixing seat (2) are provided with inclined conical holes at both ends, and the fastening conical pins (4) are coated with adhesive, and the fastening conical pins (4) are driven into the inclined conical holes at both ends of the left half-core dovetail fixing seat (1) and the right half-core dovetail fixing seat (2); the left half-core dovetail fixing seat (1) A groove for fixing the core vibration sensing element (5) and an interface for tightening the core vibration sensing element cover (3) are reserved on the top of the right half-core dove tail fixing seat (2). The core vibration sensing element (5) is placed in the groove for fixing. The core vibration sensing element cover (3) is tightened to the interface for tightening the core vibration sensing element cover (3) on the top of the left half-core dove tail fixing seat (1) and the right half-core dove tail fixing seat (2) using the core vibration sensing element cover fixing bolt (6). A threading hole is reserved on the core vibration sensing element cover (3). The lead wires of the core vibration sensing element (5) are passed through the wire holes on the core vibration sensing element cover (3) through the wire passing grooves on the tops of the left half-core dove tail fixing seat (1) and the right half-core dove tail fixing seat (2) and are led to the partition of the stator base; the core vibration sensing element sealed wire passer (7) connected to the lead wire end of the core vibration sensing element (5) passes through the partition of the stator base and is led to the outside of the machine and connected to the signal collector (10).

2. The large steam turbine generator stator core vibration online measurement device according to claim 1 is characterized in that: The left half iron core dove tail fixing seat (1) is provided with a male stopper, and the right half iron core dove tail fixing seat (2) is provided with a female stopper. The bottom widths of the left half iron core dove tail fixing seat (1) and the right half iron core dove tail fixing seat (2) are narrower than the top width of the iron core dove tail (8).

3. The large steam turbine generator stator core vibration online measurement device according to claim 1, characterized in that: After the left half iron core dove tail fixing seat (1) and the right half iron core dove tail fixing seat (2) are assembled, gaps are left between the two side slopes of the trapezoidal area formed in the iron core dove tail (8) and the two side slopes of the iron core dove tail (8), and the gap position is filled with a high-friction conformable material (9).

4. The large steam turbine generator stator core vibration online measurement device according to claim 1, characterized in that: The width of the fastening cone pin (4) is wider than the width of the inclined cone holes left at both ends of the left half iron core dove tail fixing seat (1) and the right half iron core dove tail fixing seat (2).

5. The large steam turbine generator stator core vibration online measurement device according to claim 1, characterized in that: The fixing grooves for the core vibration sensing element left on the tops of the left half-core dove tail fixing seat (1) and the right half-core dove tail fixing seat (2) match the size of the core vibration sensing element (5).

6. The large steam turbine generator stator core vibration online measurement device according to claim 1, characterized in that: The left half iron core dove tail fixing seat (1) and the right half iron core dove tail fixing seat (2) have no tapered holes with inclination at both ends, the length dimensions of the left half iron core dove tail fixing seat (1) and the right half iron core dove tail fixing seat (2) match the axial length dimensions of the two iron core radial ventilation paths (12), and L-shaped positioning blocks (11) are driven into the two iron core radial ventilation paths (12) at both ends of the left half iron core dove tail fixing seat (1) and the right half iron core dove tail fixing seat (2).

7. The large steam turbine generator stator core vibration online measurement device according to claim 1, characterized in that: The left half-core dove tail fixing seat (1) and the right half-core dove tail fixing seat (2) do not have tapered holes at both ends, but have threaded holes at both ends. Adhesive glue is coated on the expansion type fastening bolt (13), and the expansion type fastening bolt (13) is screwed into the threaded holes at both ends of the left half-core dove tail fixing seat (1) and the right half-core dove tail fixing seat (2).

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