CN218984713U

CN218984713U - Special tool for adjusting clearance of steam shaft seal of steam turbine

Info

Publication number: CN218984713U
Application number: CN202223130117.0U
Authority: CN
Inventors: 谢英强
Original assignee: Shanghai Gaoqiao Sgpec Petrochemical Engineering & Construction Co ltd
Current assignee: Shanghai Gaoqiao Sgpec Petrochemical Engineering & Construction Co ltd
Priority date: 2022-11-24
Filing date: 2022-11-24
Publication date: 2023-05-09
Anticipated expiration: 2032-11-24

Abstract

The utility model provides a special tool for adjusting the clearance of a steam turbine steam shaft seal, which is used for replacing a true shaft to adjust the clearance of the steam shaft seal, wherein a plurality of impellers are arranged on the true shaft, and steam shaft seals with various sizes are arranged between the impellers, and the special tool for adjusting the clearance of the steam turbine steam shaft seal comprises: two bearing brackets which are respectively arranged in bearing seats at two ends of the steam turbine rotor and are used for providing support; the two ends of the optical axis are respectively arranged on bearing brackets corresponding to the two bearing seats; the plurality of dummy discs are respectively sleeved on the optical axis in sequence; the diameter of each false disc is matched with the size of the corresponding steam shaft seal; according to the position sequence of the size of the steam shaft seal arranged on the true shaft, the false disc with the corresponding size is sleeved on the optical axis according to the position sequence. The utility model makes the adjustment of the clearance of the steam shaft seal more convenient, can be constructed by a plurality of persons at the same time, and has the advantages of measuring and adjusting division work, improving the working efficiency, improving the maintenance control precision, reducing the repair workload when the true shaft is accepted, and the like.

Description

Special tool for adjusting clearance of steam shaft seal of steam turbine

Technical Field

The utility model belongs to the field of turbine maintenance, and particularly relates to a special tool for adjusting a gap of a turbine shaft seal.

Background

The adjustment of the gap between the steam shaft seals of the steam turbine is an important link in the maintenance process of the steam turbine. Two purposes of turbine maintenance include ensuring both operational safety and unit operational economics. Specifically, if the radial clearance is too small for adjusting the clearance of the steam shaft seal of the steam turbine, dynamic and static friction is caused, so that the rotor is bent and the bearing vibrates, and the safety of the unit is further affected; conversely, if the radial clearance is too large, the amount of interstage leakage gas increases, and the economy of the unit is reduced. Therefore, a radial clearance adjustment tool is needed to accurately adjust the clearance so as to improve the use safety of the steam turbine and reduce the running cost of the steam turbine.

Disclosure of Invention

The utility model aims to provide a special tool for adjusting the clearance of a steam shaft seal of a steam turbine, which has the advantages of high adjustment precision, low cost and wide applicability.

In order to achieve the above purpose, the utility model provides a special tool for adjusting the clearance of a steam shaft seal of a steam turbine, which is used for replacing a true shaft to adjust the clearance of the steam shaft seal, be provided with a plurality of impellers on the true axle, be provided with the vapour bearing seal of multiple size between the impeller, this turbine vapour bearing seal clearance adjustment specialized tool includes: two bearing brackets which are respectively arranged in bearing seats at two ends of the steam turbine rotor and are used for providing support; the two ends of the optical axis are respectively arranged on the bearing brackets corresponding to the two bearing seats; the plurality of dummy discs are respectively sleeved on the optical axis in sequence; the diameter of each false disc is matched with the size of the corresponding steam shaft seal; according to the position sequence of the size of the steam shaft seal arranged on the true shaft, the false disc with the corresponding size is sleeved on the optical axis according to the position sequence.

Preferably, each bearing seat is provided with a first concave arc-shaped supporting part for bearing the bearing bracket.

Preferably, each of the bearing brackets comprises: a second arc-shaped supporting part provided in the first arc-shaped supporting part; and the two connecting plates are respectively connected with the two ends of the second arc-shaped supporting part and are used for being connected with the bearing seat.

Preferably, the outer arc diameter of the second arc-shaped supporting part is smaller than the inner arc diameter of the first arc-shaped supporting part, and the inner arc diameter of the second arc-shaped supporting part is larger than the end diameter of the optical axis.

Preferably, the inner side wall of the second arc-shaped supporting part is symmetrically provided with adjusting rollers along the circumferential direction thereof, and the central position of the optical axis placed in the second arc-shaped supporting part is adjusted, so that the optical axis can freely rotate on the adjusting rollers in the second arc-shaped supporting part and the central position is kept unchanged.

Preferably, a heightening gasket is arranged between the bearing seat and the connecting plate, the heightening gasket is increased or reduced, the height adjustment of the bearing bracket is realized, and the vertical direction central position of the optical axis placed in the bearing bracket is ensured to be consistent with the vertical direction central position of the true shaft. Preferably, each of the dummy discs includes: the center of the sleeving disc is provided with a sleeving hole, and the diameter of the sleeving hole is matched with the diameter of the optical axis; a connection ring arranged around the outer side of the sheathing disc; and a detection ring arranged around the outer side of the connection ring.

Preferably, the thickness d1 of the sleeving disc is greater than the thickness d3 of the detection ring, and the thickness d3 of the detection ring is greater than the thickness d2 of the connection ring.

In summary, compared with the prior art, the special tool for adjusting the clearance of the steam shaft seal of the steam turbine has the following beneficial effects:

1. the special tool for adjusting the clearance of the steam turbine shaft seal changes the measurement adjustment by using a true shaft in the past, and avoids the workload of repeatedly hoisting the true shaft and the steam turbine shaft seal sleeve;

2. the device changes the condition that only integral measurement adjustment can be carried out by utilizing a true shaft, can measure a single steam shaft seal by moving a false disc in a special tool on an optical axis, can simultaneously carry out construction by a plurality of people, and has the advantages of cooperation of measurement and adjustment division, reduction of repair workload during true shaft inspection and improvement of working efficiency;

3. the false disc has exquisite appearance, so that the adjustment of the clearance of the steam shaft seal is more convenient, and the overhaul control precision is improved.

Drawings

FIG. 1 is a schematic diagram of a special tool for adjusting the clearance of a steam shaft seal of a steam turbine;

FIG. 2 is a schematic view of the optical axis structure of the tool for adjusting the clearance of the steam shaft seal of the steam turbine;

FIG. 3 is a schematic view of the structure of the bearing bracket in the special tool for adjusting the clearance of the steam shaft seal of the steam turbine;

FIG. 4 is a schematic view of the structure of the bearing bracket in the bearing seat in the special tool for adjusting the clearance of the steam shaft seal of the steam turbine;

FIG. 5 is a schematic diagram of the dummy disc structure in the tool for adjusting the clearance of the steam shaft seal of the steam turbine.

Detailed Description

The technical scheme, constructional features, achieved objects and effects of the embodiments of the present utility model will be described in detail below with reference to fig. 1 to 5 in the embodiments of the present utility model.

It should be noted that, the drawings are in very simplified form and all use non-precise proportions, which are only used for the purpose of conveniently and clearly assisting in describing the embodiments of the present utility model, and are not intended to limit the implementation conditions of the present utility model, so that the present utility model has no technical significance, and any modification of structure, change of proportion or adjustment of size, without affecting the efficacy and achievement of the present utility model, should still fall within the scope covered by the technical content disclosed by the present utility model.

It is noted that in the present utility model, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

In the prior art, the clearance of the steam shaft seal of the steam turbine is adjusted by directly utilizing a true shaft for acceptance measurement, a plurality of impellers are arranged on the true shaft, and the steam shaft seals with various sizes are arranged between the impellers; because the impeller position on the true shaft is fixed, and the steam shaft seal is clamped between impellers, the problem that the clearance of the steam shaft seal cannot be measured manually exists, and the clearance between the true shaft and the steam shaft seal can be adjusted only through integral measurement, so that the engineering quantity is large, and the clearance of the single steam shaft seal cannot be adjusted directly.

In view of the above-mentioned drawbacks, the present utility model provides a special tool for adjusting a clearance of a steam turbine shaft seal, which is used for adjusting the clearance of the steam turbine shaft seal instead of a true shaft, as shown in fig. 1, and comprises: two bearing brackets 2 respectively arranged in the bearing seats 1 at two ends of the turbine rotor for providing support; the two ends of the optical axis 3 are respectively arranged on the bearing brackets 2 corresponding to the two bearing seats 1; the plurality of dummy discs 4 are respectively sleeved on the optical axis 3 in sequence; the diameter of each dummy disc 4 is matched with the size of the corresponding steam shaft seal; according to the position sequence of the size of the steam shaft seal arranged on the true shaft, the false disc 4 with the corresponding size is sleeved on the optical axis 3 according to the position sequence.

In this embodiment, as shown in fig. 2, the optical axis 3 is cylindrical, one end of the optical axis is provided with a shaft diameter adjusting ring 31, the shaft diameter adjusting ring 31 is sleeved at one end of the optical axis, and when the diameter deviation of the inner arc surface of the second arc-shaped supporting portion 21 of the bearing bracket 2 is large, the central line of the optical axis 3 can be kept consistent in the front-back direction by sleeving the shaft diameter adjusting ring 31. Specifically, the length of the optical axis 3 is 3600mm, and the diameter of the optical axis 3 is 250mm, and the two ends of the optical axis 3 are just placed on the bearing brackets 2 corresponding to the two bearing seats 1; wherein, the diameter of one end of the shaft diameter adjusting ring 31 is 260mm, that is, the wall thickness of the shaft diameter adjusting ring 31 is 5mm, and the diameters of two ends of the optical axis 3 are respectively matched with the diameters of the corresponding bearing brackets 2, that is, the diameter of one bearing bracket 2 is 250mm (used for placing one end without the shaft diameter adjusting ring 31), and the diameter of the other bearing bracket 2 is 260mm (used for placing one end with the shaft diameter adjusting ring 31).

Further, as shown in fig. 4 (a), each bearing seat 1 is provided with a first concave arc-shaped supporting portion 11 for carrying the bearing bracket 2. Wherein, as shown in fig. 3, each of the bearing brackets 2 comprises: a second arc-shaped supporting portion 21 provided in the first arc-shaped supporting portion 11; two connection plates 22 are respectively connected to two ends of the second arc-shaped supporting portion 21, and when the second arc-shaped supporting portion 21 is placed in the first arc-shaped supporting portion 11, the two connection plates 22 are placed on top of two sides of the bearing seat 1 and are used for being connected with the bearing seat 1 (as shown in fig. 4 (b)). The outer arc diameter of the second arc-shaped supporting part 21 is smaller than the inner arc diameter of the first arc-shaped supporting part 11, and the inner arc diameter of the second arc-shaped supporting part 21 is larger than or equal to the end diameter of the optical axis 3, so that the optical axis 3 can be placed in the bearing bracket 2 from the opening of the second arc-shaped supporting part 21.

Further, as shown in fig. 3, the inner sidewall of the second arc-shaped supporting portion 21 is symmetrically provided with adjusting rollers 23 along the circumferential direction thereof; specifically, the side wall of the second arc-shaped supporting portion 21 is symmetrically provided with a pair of mounting holes along the circumferential direction thereof, and the connecting piece sequentially passes through the mounting holes and the adjusting roller 23 to fix the adjusting roller 23 on the inner side wall of the second arc-shaped supporting portion 21. The adjusting roller 23 automatically adjusts the center position of the optical axis 3 placed in the second arc-shaped supporting portion 21 by means of gravity, so that the optical axis 3 can freely rotate on the adjusting roller in the second arc-shaped supporting portion 21 and the center position is kept unchanged.

Meanwhile, an heightening gasket can be arranged between the bearing seat 1 and the connecting plate 22, the heightening gasket is added or reduced, the height of the bearing bracket 2 is adjusted, and the height of the optical axis 3 placed in the bearing bracket 2 is further adjusted, so that the central position of the optical axis 3 in the vertical direction is ensured to be consistent with the central position of the true axis in the vertical direction; the horizontal position of the bearing bracket is adjusted by adjusting the horizontal direction left and right positions of the connecting plate 22 on the bearing seat 1, so that the horizontal direction left and right positions of the optical axis 3 placed in the bearing bracket 2 are adjusted, the horizontal direction center position of the optical axis 3 is ensured to be consistent with the horizontal direction center position of the true shaft, the adjustment precision of the steam shaft seal gap is ensured, and the steam shaft seal gap meets the working standard.

Wherein, as shown in fig. 5, each of the dummy discs 4 includes: a sleeve hole 411 is formed in the center of the sleeve disc 41, the diameter of the sleeve hole 411 is matched with the diameter of the optical axis 3, and the dummy disc 4 is arranged on the optical axis 3 through the sleeve hole 411; a connection ring 42 provided around the outside of the sheathing disk 41; a detection ring 43 disposed around the outside of the connection ring 42; in this embodiment, the sleeved disc 41, the connection ring 42 and the detection ring 43 are integrally formed, and the thickness d1 of the sleeved disc 41 is greater than the thickness d3 of the detection ring 43, and the thickness d3 of the detection ring 43 is greater than the thickness d2 of the connection ring 42, i.e. d1 > d3 > d2.

Further, in this embodiment, as shown in fig. 5, the thickness d1 of the sleeve disk 41 is 80mm, and the diameter of the sleeve hole 411 is 250.02-250.03 mm (the fit clearance is as small as possible in practical operation to ensure the measurement accuracy in use, and the dummy disk 4 can be more easily sleeved on the optical axis 3 and can move freely), that is, the diameter of the sleeve disk is matched with the diameter of the optical axis 3; the thickness of the connecting ring 42 is 15mm; the thickness of the detection ring 43 is 25mm; by setting the thickness of the fit-on plate 41 to be maximum, the bearing capacity of the dummy plate 4 can be improved, preventing the fit-on hole 411 in the center of the dummy plate 4 from being broken due to the thickness being too thin; the thickness of the connecting ring 42 is set to be minimum, so that the weight of the dummy disc 4 can be effectively reduced, and the dummy disc 4 can move along the optical axis 3 more conveniently; the thickness of the detection ring 43 is set to be larger than that of the connection ring 42, namely, the area of the annular side wall of the dummy disc 4 is increased, so that the area of the dummy disc 4 opposite to the steam shaft seal is larger, a larger detection area is provided, and manual measurement is facilitated.

Further, as shown in fig. 5, the outer diameter Φa of the dummy disc 4 consisting of the sheathing disc 41, the connection ring 42 and the detection ring 43 is matched with the corresponding steam shaft seal. The diameter of the sleeve hole 411 of each dummy disc 4 is equal and is matched with the diameter of the optical axis 3, and the outer diameter of the dummy disc 4 is different in size so as to be suitable for steam shaft seals with different sizes. Since the diameters of the sleeved holes 411 are the same, the dummy disc 4 can move back and forth on the optical axis 3 during adjustment, and a plurality of steam shaft seal gaps with the same size but different positions are measured, so that the production efficiency is greatly improved. Meanwhile, the dummy disc 4 can be used in different units, and the dummy disc 4 is only required to be adjusted and added according to the positions and the number of the steam shaft seals in the units before the optical axis is hoisted and placed on the bearing bracket 2.

In this example, the following table shows the size and number of dummy disks 4 to be provided for each portion of the steam seal of a 25MW steam turbine set.

The steam shaft seals of the #5 machine and the #7 machine with the number 1 and the number 6 can be obtained by the table above, and can share one dummy disc 4 (phiA=434) ^-0.20 mm) adjusting the clearance of the steam shaft seal; the number 3 and 4 bits of the #5 machine and the #7 machine can share one dummy disc 4, respectively, Φa=590 ^-0.20 mm and Φa=585 ^-0.20 mm。

When the special tool provided by the utility model is used for adjusting the clearance of the steam shaft seal, the maximum value and the minimum value of the adjustment range of the clearance of the steam shaft seal, which are adjusted by utilizing the optical axis 3, are calculated through the following steps: s1, measuring an outer diameter dimension value D1 of each steam shaft seal on a true shaft; s2, measuring an outer diameter dimension value D2 of the corresponding dummy disc 4; s3, determining a steam shaft seal clearance standard: minimum value C, maximum value D. Obtaining a size value according to the steps S1 to S3, and obtaining a steam shaft seal gap adjustment value adjusted by the optical axis 3: minimum min= (D1-D2)/2+C; max= (D1-D2)/2+D.

When the adjustment value of the steam shaft seal gap is obtained, the steam shaft seal gap is adjusted according to the following steps:

step 1, according to the position sequence of the sizes of all the steam shaft seals on a true shaft, sequentially sleeving a false disc 4 with the corresponding size on an optical axis 3;

step 2, mounting the bearing bracket 2 into two bearing seats 1, and preparing a fixing bolt and a heightening gasket;

step 3, hanging an optical axis 3 sleeved with a dummy disc 4 on a bearing bracket 2, and fixing two ends of the bearing bracket 2 on two bearing seats 1 respectively through holes on a connecting plate by adopting fixing bolts;

step 4, the center position of the optical axis 3 is kept consistent with the center position of the true axis by adjusting the thickness of the heightened gasket between the bearing seat 1 and the connecting plate 22 and the left and right positions of the connecting plate 22 on the bearing seat 1 in the horizontal direction;

step 5, after the position of the optical axis 3 is adjusted, adjusting the clearance of the steam shaft seal; specifically, the adjustment is respectively carried out by dividing the upper half of the steam jacket and the lower half of the steam jacket into a partition board sleeve, and the measurement and the adjustment of the lower half of the steam jacket and the partition board sleeve are firstly carried out; and (3) respectively moving the dummy disc 4 to each steam shaft seal block to be measured, measuring a first gap between the steam shaft seal block and the dummy disc 4 by using a clearance gauge, comparing the first gap with a corresponding maximum value MAX and a corresponding minimum value MIN, adjusting the gap beyond the adjustment range of the steam shaft seal gap, and performing preliminary acceptance by using the clearance gauge according to an adjustment standard after the adjustment.

And similarly, repeating the step S5 for the upper half steam jacket and the partition board jacket, respectively measuring second gaps between the steam shaft seal blocks in the upper half steam jacket and the partition board jacket and the dummy disc 4, comparing the second gaps with corresponding maximum value MAX and minimum value MIN, adjusting if the second gaps exceed the range, and carrying out preliminary acceptance by using a feeler gauge according to the adjusted standard after the adjustment.

And (3) performing preliminary adjustment on the clearance of the steam shaft seal by using the dummy disc 4 in the steps 1-5 to ensure that the clearance of the steam shaft seal meets the requirement, then performing integral acceptance by using a true shaft, and determining whether the clearance of the steam shaft seal meets the standard by using an adhesive tape method.

In summary, compared with the prior art, the special tool for adjusting the clearance of the steam turbine steam shaft seal provided by the utility model has the advantages that the clearance adjustment of the steam turbine steam shaft seal is more convenient, a plurality of persons can simultaneously perform construction, measurement and adjustment work division work are performed, the working efficiency is improved, the overhaul control precision is improved, the repair workload during true shaft acceptance is reduced, and the like.

While the present utility model has been described in detail through the foregoing description of the preferred embodiment, it should be understood that the foregoing description is not to be considered as limiting the utility model. Many modifications and substitutions of the present utility model will become apparent to those of ordinary skill in the art upon reading the foregoing. Accordingly, the scope of the utility model should be limited only by the attached claims.

Claims

1. The utility model provides a steam turbine steam seal clearance adjustment specialized tool for replace the true axle to carry out the adjustment of steam seal clearance, be provided with a plurality of impellers on the true axle, be provided with the steam seal of multiple size between the impeller, its characterized in that, this steam turbine steam seal clearance adjustment specialized tool includes:

two bearing brackets (2) which are respectively arranged in bearing seats (1) at two ends of the steam turbine rotor and are used for providing support;

the two ends of the optical axis (3) are respectively placed on the bearing brackets (2) corresponding to the two bearing seats (1);

a plurality of dummy discs (4) respectively sleeved on the optical axis (3) in sequence; the diameter of each dummy disc (4) is matched with the size of the corresponding steam shaft seal;

according to the position sequence of the size of the steam shaft seal arranged on the true shaft, the false disc (4) with the corresponding size is sleeved on the optical axis (3) according to the position sequence.

2. The special tool for adjusting the clearance of the steam shaft seal of the steam turbine according to claim 1, wherein each bearing seat (1) is provided with a first concave arc-shaped supporting part (11) for bearing the bearing bracket (2).

3. The turbine shaft seal clearance adjustment special tool according to claim 2, characterized in that each bearing bracket (2) comprises: a second arc-shaped supporting portion (21) provided in the first arc-shaped supporting portion (11); and the two connecting plates (22) are respectively connected with the two ends of the second arc-shaped supporting part (21) and are used for being connected with the bearing seat (1).

4. A tool for adjusting a clearance of a steam shaft seal of a steam turbine according to claim 3, wherein the outer arc diameter of the second arc-shaped supporting portion (21) is smaller than the inner arc diameter of the first arc-shaped supporting portion (11), and the inner arc diameter of the second arc-shaped supporting portion (21) is larger than the end diameter of the optical axis (3).

5. A special tool for adjusting the clearance of a steam shaft seal of a steam turbine according to claim 3, wherein adjusting rollers (23) are symmetrically arranged on the inner side wall of the second arc-shaped supporting part (21) along the circumferential direction of the inner side wall, and the central position of the optical axis (3) placed in the second arc-shaped supporting part (21) is adjusted, so that the optical axis (3) can freely rotate on the adjusting rollers (23) in the second arc-shaped supporting part (21) and the central position is kept unchanged.

6. The special tool for adjusting the clearance of the steam shaft seal of the steam turbine according to claim 1, wherein a heightening gasket is arranged between the bearing seat (1) and the connecting plate (22), and the heightening gasket is added or reduced to realize the height adjustment of the bearing bracket (2) so as to ensure that the vertical central position of the optical axis (3) placed in the bearing bracket (2) is consistent with the vertical central position of the true shaft.

7. The turbine shaft seal clearance adjustment special tool according to claim 1, characterized in that each of the dummy discs (4) comprises:

a sleeved disc (41) is provided with a sleeved hole (411) at the center, and the diameter of the sleeved hole (411) is matched with the diameter of the optical axis (3);

a connection ring (42) disposed around the outside of the sheathing disk (41);

and a detection ring (43) disposed around the outside of the connection ring (42).

8. The tool for adjusting the clearance of the steam shaft seal of the steam turbine according to claim 7, wherein the thickness d1 of the sleeved disk (41) is larger than the thickness d3 of the detection ring (43), and the thickness of the detection ring (43) is larger than the thickness d2 of the connection ring (42).