CN212837969U - Micro-gap honeycomb steam seal for low-pressure cylinder of steam turbine - Google Patents
Micro-gap honeycomb steam seal for low-pressure cylinder of steam turbine Download PDFInfo
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- CN212837969U CN212837969U CN202021670334.7U CN202021670334U CN212837969U CN 212837969 U CN212837969 U CN 212837969U CN 202021670334 U CN202021670334 U CN 202021670334U CN 212837969 U CN212837969 U CN 212837969U
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Abstract
The utility model discloses a micro-gap honeycomb steam seal for a low-pressure cylinder of a steam turbine, belonging to the technical field of steam seal devices of steam turbines; it comprises a steam seal body; one end of the gland casing is arranged on the gland casing through a plate spring, and the other end of the gland casing is provided with a plurality of micro-gap high teeth with the same structure; the micro-gap high teeth are made of ferrite materials, and a honeycomb belt is further arranged between every two adjacent micro-gap high teeth; the height of the honeycomb belt is 0.1-0.15 mm greater than the designed height of the labyrinth gland seal low teeth under the same low-pressure cylinder specification; the thickness and the height of the micro-gap high tooth are both larger than the designed thickness and the height of the labyrinth type steam seal high tooth under the same low-pressure cylinder specification; the utility model discloses effectively solved and did not have an economy and reliable transformation scheme at present and be used for improving low cylinder portion vapor seal performance index, further improved the problem of steam turbine efficiency.
Description
Technical Field
The utility model relates to a steam turbine gland sealing technical field, concretely relates to microgap honeycomb gland seal for steam turbine low pressure jar.
Background
The steam seal is a device which is arranged between the dynamic part and the static part of the steam turbine and reduces or prevents the leakage of steam and the leakage of air at the vacuum side; the structure of the gas seal is often related to the turbine section where the gas seal works, for example, the selection of the gas seal at the positions of a high-intermediate pressure cylinder and a low-pressure cylinder of the turbine is very different, and the general high-pressure cylinder mostly selects a component with a structure such as a brush type gas seal or a contact type gas seal; and a conventional comb-tooth type steam seal or a side-tooth labyrinth steam seal and the like are generally adopted in the low-pressure cylinder area. The reason for this is that the performance requirement of the low-pressure cylinder is not as high as that of the high-intermediate pressure cylinder, but the performance of the steam seal arranged at the part of the low-pressure cylinder can also influence the working efficiency of the steam turbine, and because the pressure difference of the part of the low-pressure cylinder is larger during working, the steam seal at the part of the low-pressure cylinder is difficult to be reformed under the premise of ensuring the use requirements such as reforming cost and service life, so that the working efficiency of the whole steam turbine is improved, which is a main problem facing at present.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the micro-gap honeycomb steam seal for the low-pressure cylinder of the steam turbine is provided, and the problem that no economic and reliable transformation scheme is used for improving the performance index of partial steam seal of the low-pressure cylinder and further improving the efficiency of the steam turbine is solved.
In order to solve the above problem, the utility model provides a following technical scheme:
a micro-gap honeycomb steam seal for a low-pressure cylinder of a steam turbine comprises a steam seal body; one end of the gland casing is arranged on the gland casing through a plate spring, and the other end of the gland casing is provided with a plurality of micro-gap high teeth with the same structure; the micro-gap high teeth are made of ferrite materials, and a honeycomb belt is further arranged between every two adjacent micro-gap high teeth; the height of the honeycomb belt is 0.1-0.15 mm greater than the designed height of the labyrinth gland seal low teeth under the same low-pressure cylinder specification; the thickness and the height of the micro-gap high tooth are both larger than the designed thickness and the height of the labyrinth type steam seal high tooth under the same low-pressure cylinder specification.
Preferably, the microgap tall teeth are installed in the gland body by an embedding process.
Preferably, the honeycomb belt is composed of hexagonal hole connecting pieces, and each honeycomb unit is of a hexagonal structure with the unilateral size of 2-3 mm.
Preferably, the number of the micro-gap high teeth is not less than three, and the micro-gap high teeth are uniformly distributed on the end face of the inner ring of the gland sealing body.
The utility model discloses beneficial effect:
the beneficial effects of the utility model are embodied in following several aspects:
1. the honeycomb belt is replaced by the low teeth on the labyrinth traditional high-low tooth steam seal, which is equivalent to increase the number of the steam seal teeth, increase the steam flow resistance and greatly improve the sealing effect; the steam seal still adopts the structure of letting out of former traditional steam seal, probably produces bump and rubs in the start-up process, but because the honeycomb material is softer, can not produce big influence, for example when using on the aeronautical turbine (rotational speed 40000r/min, operating temperature 1000 ~ 1500 ℃), because the turbine structure size is shorter, can't design letting out the steam seal, and adopt the utility model discloses a fixed knot constructs, even if there is the honeycomb steam seal that damages when bumping and rubbing, and can not produce the influence to the axle;
2. the high teeth on the original steam seal are reformed, and the high teeth are processed by using ferrite materials, so that the heat generated when the high teeth are rubbed with a rotor is small, and the shaft is not easy to bend; meanwhile, because the height and the thickness of the high teeth are heightened and thickened, the high teeth can be firstly contacted with the micro-gap high teeth if collision and abrasion are generated when the machine is started to be over-critical, and because the high teeth are thick and large, the high teeth are not easy to abrade, so that the other teeth cannot be abraded, and the steam seal gap in normal operation can be ensured;
3. compared with the common labyrinth gland seal, the labyrinth gland seal has lower air leakage rate, lower price and processing and maintenance difficulty compared with the Braiden gland seal at the position of the low-pressure cylinder, and better cost performance;
4. the design of micro-gap high teeth on the steam seal further reduces the radial gap between the steam seal and the rotor, and improves the efficiency of the whole unit;
5. any existing poor centering or deformation can be accommodated under normal operating conditions, allowing rubbing of the gland seal teeth and the main shaft at the contact without causing long-term vibration.
Drawings
Fig. 1 is a schematic structural view of the present invention in an embodiment;
FIG. 2 is a schematic view of FIG. 1 taken along line A;
description of reference numerals: 1. gland casing, 2, plate spring, 3, gland casing, 4, micro-gap high tooth, 5, honeycomb belt.
Detailed Description
The invention will be further described with reference to the following drawings and specific embodiments:
example (b):
referring to fig. 1, the present embodiment provides a micro-gap honeycomb gland seal for a low pressure cylinder of a steam turbine, which comprises a gland seal body 1; one end of the gland casing 1 is arranged on a gland casing 3 through a plate spring 2, and the other end of the gland casing 1 is provided with a plurality of micro-gap high teeth 4 with the same structure; the micro-gap high teeth 4 are made of ferrite materials, and a honeycomb belt 5 is further arranged between every two adjacent micro-gap high teeth 4; the height of the honeycomb belt 5 is 0.1-0.15 mm greater than the designed height of the labyrinth gland seal low teeth under the same low-pressure cylinder specification; the thickness and the height of the micro-gap high teeth 4 are both larger than the designed thickness and the height of the labyrinth type steam seal high teeth under the same low-pressure cylinder specification. It should be understood that, in the present embodiment, the design is performed for the low pressure cylinder portion of the steam turbine, based on which, the design standard of the micro-gap high teeth 4 in the present embodiment can refer to the design value of the corresponding high teeth on the braden gland seal of the high and medium pressure cylinder portion under the same specification, and conventionally, the tooth height and tooth thickness of the high teeth on the braden gland seal for the high and medium pressure cylinder are both greater than the corresponding values of the conventional gland seal on the low pressure cylinder.
The micro-gap tall teeth 4 are installed in the gland body 1 by an embedding process.
Reference may be made to FIG. 2; the honeycomb belt 5 is composed of hexagonal hole connecting pieces, and each honeycomb unit is of a hexagonal structure with the unilateral size of 2-3 mm.
The number of the micro-gap high teeth 4 is not less than three, and the micro-gap high teeth are uniformly distributed on the end face of the inner ring of the gland sealing body 1.
Claims (4)
1. A micro-gap honeycomb gland seal for a low pressure cylinder of a steam turbine comprises a gland seal body (1); the method is characterized in that: one end of the steam seal body (1) is arranged on the steam seal sleeve (3) through a plate spring (2), and a plurality of micro-gap high teeth (4) with the same structure are arranged at the other end of the steam seal body (1); the micro-gap high teeth (4) are all made of ferrite materials, and a honeycomb belt (5) is further installed between every two adjacent micro-gap high teeth (4); the height of the honeycomb belt (5) is 0.1-0.15 mm greater than the designed height of labyrinth gland low teeth under the same low-pressure cylinder specification; the thickness and the height of the micro-gap high tooth (4) are both larger than the design thickness and the height of the labyrinth type steam seal high tooth under the same low-pressure cylinder specification.
2. A micro-gap honeycomb gland seal for low pressure cylinders of steam turbines according to claim 1, wherein: the micro-gap high teeth (4) are installed in the steam seal body (1) through an embedding process.
3. A micro-gap honeycomb gland seal for low pressure cylinders of steam turbines according to claim 1, wherein: the honeycomb belt (5) is composed of hexagonal hole connecting pieces, and each honeycomb unit is of a hexagonal structure with the unilateral size of 2-3 mm.
4. A micro-gap honeycomb gland seal for low pressure cylinders of steam turbines according to claim 1, wherein: the number of the micro-gap high teeth (4) is not less than three, and the micro-gap high teeth are uniformly distributed on the end face of the inner ring of the gland sealing body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021670334.7U CN212837969U (en) | 2020-08-12 | 2020-08-12 | Micro-gap honeycomb steam seal for low-pressure cylinder of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021670334.7U CN212837969U (en) | 2020-08-12 | 2020-08-12 | Micro-gap honeycomb steam seal for low-pressure cylinder of steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212837969U true CN212837969U (en) | 2021-03-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021670334.7U Active CN212837969U (en) | 2020-08-12 | 2020-08-12 | Micro-gap honeycomb steam seal for low-pressure cylinder of steam turbine |
Country Status (1)
| Country | Link |
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| CN (1) | CN212837969U (en) |
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2020
- 2020-08-12 CN CN202021670334.7U patent/CN212837969U/en active Active
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