CN212296505U - Mechanical sealing structure of steam turbine - Google Patents
Mechanical sealing structure of steam turbine Download PDFInfo
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- CN212296505U CN212296505U CN202021859150.5U CN202021859150U CN212296505U CN 212296505 U CN212296505 U CN 212296505U CN 202021859150 U CN202021859150 U CN 202021859150U CN 212296505 U CN212296505 U CN 212296505U
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- steam turbine
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Abstract
The utility model is suitable for the field of energy-saving and environment-friendly machinery, in particular to a mechanical sealing structure of a steam turbine, which comprises a partition wall; the partition wall is rotatably connected with an impeller, and an axial high-low tooth labyrinth is formed by the partition wall and the impeller; the shaft sleeve forms a radial high-low tooth labyrinth through the air seal pieces; the surface of the air sealing piece close to the partition wall is provided with a sealing groove, and a plurality of air release holes B communicated with the air release holes A formed in the partition wall are formed in the sealing groove; the partition wall and the impeller form an axial high-low tooth labyrinth, and the shaft sleeve forms a radial high-low tooth labyrinth through the air seal piece; form the throttle passageway, normal operating steam will reduce through passageway steam temperature and pressure, and the seal groove is inside to be seted up a plurality ofly and the air vent B of seting up some air vent A intercommunications on the partition wall, makes steam pressure reduce, and air vent A and air vent B cooperate and introduce high temperature steam, ensure that sealed inside gas does not outwards reveal, and the leakproofness is good, the reliability is high, has reduced wearing and tearing, and is longe-lived.
Description
Technical Field
The utility model relates to an energy-concerving and environment-protective machinery specifically is a steam turbine mechanical seal structure.
Background
The low-temperature waste heat power generation of the steam turbine machinery below 350 ℃ generally exists in building materials, metallurgy, chemical engineering and light industry, and has important significance for realizing high-efficiency recycling. The heat energy of the low-temperature waste heat is converted into electric energy, so that the method is a limited way for improving the energy utilization rate and reducing the environmental pollution; centripetal and axial flow steam turbine machinery is widely applied to the field of energy conservation and environmental protection, wherein waste heat steam energy recovery is used as a key technology for rapid development.
At the present stage, carbon ring sealing or other non-contact radial flat tooth sealing is selected as the current mainstream choice for high-temperature and high-pressure steam, and the defects of high manufacturing cost, short service life, poor reliability and the like cause that the high-temperature and high-pressure steam cannot be rapidly popularized and applied; the typical sealing device adopted by the steam turbine machinery is carbon ring sealing or other non-contact radial flat tooth sealing, wherein the carbon ring sealing belongs to contact sealing, slight abrasion exists in long-time work, and the reliability is not high, namely, the non-contact radial flat tooth sealing is adopted, the sealing effect is not good, the axial size is long, and the reliability of a rotor of the unit is reduced.
SUMMERY OF THE UTILITY MODEL
The carbon ring seal or other non-contact radial flat tooth seals are selected as the current mainstream for high-temperature and high-pressure steam at the present stage, and the defects of high manufacturing cost, short service life, poor reliability and the like cause that the high-temperature and high-pressure steam cannot be rapidly popularized and applied; the utility model aims to provide a steam turbine mechanical seal structure to solve above-mentioned problem, the sealing device that typical steam turbine machinery adopted is that the carbocycle seals or other non-contact radial flat tooth are sealed, and wherein the carbocycle seals to belong to the contact seal, and long-time work exists slight wearing and tearing, and the reliability is not high, adopts the radial flat tooth of non-contact to seal the effect not good promptly to the axial dimension is long, has reduced the problem of the rotor reliability of unit, the utility model aims to provide a steam turbine mechanical seal structure. In order to achieve the above object, the utility model provides a following technical scheme:
a steam turbine mechanical seal structure includes a partition wall;
the partition wall is rotationally connected with an impeller, and an axial high-low tooth labyrinth is formed by matching a chute formed in the fixed static partition wall and a gear boss fixed on the rotationally connected impeller; a throttling channel is formed by the labyrinth with high and low teeth between the partition wall and the impeller, and the temperature and pressure of the steam of normal working steam passing through the channel are reduced;
the structure also comprises a shaft sleeve, wherein the shaft sleeve is connected on the partition wall through an air seal piece in a penetrating way, and the impeller is rotationally connected inside the shaft sleeve; wherein, the shaft sleeve forms a radial high-low tooth labyrinth through the air seal pieces;
the seal groove has been seted up on the face that the atmoseal spare is close to the partition wall, seal groove inside set up a plurality ofly with set up some air vent A intercommunication's air vent B on the partition wall, make steam pressure reduce, air vent A and air vent B cooperation also can introduce high-temperature steam, ensure that sealed inside gas does not outwards reveal.
An inclined groove formed on the partition wall in a fixed static state is matched with a gear boss fixed on the impeller in a rotary connection state to form an axial high-low tooth labyrinth, and a shaft sleeve forms a radial high-low tooth labyrinth between air seal pieces; form the throttle passageway, normal operating steam will reduce through passageway steam temperature and pressure, and the seal groove is inside to be seted up a plurality ofly simultaneously and set up some bleeder holes B of bleeder hole A intercommunication on the partition wall, makes steam pressure reduce, and high temperature steam also can be introduced in bleeder hole A and bleeder hole B cooperation, ensures that sealed inside gas does not outwards reveal, and the leakproofness is good, the reliability is high, has reduced wearing and tearing, has improved life.
The utility model discloses among the steam turbine mechanical seal structure: the partition wall is installed on the air inlet shell.
The utility model discloses among the steam turbine mechanical seal structure: the air sealing pieces are two unit air sealing pieces which are horizontally split and are fixedly assembled and fixed through screws.
The utility model discloses among the steam turbine mechanical seal structure: and a main shaft fixed on the impeller is inserted in the shaft sleeve.
As a further scheme: the main shaft is in interference fit with the shaft sleeve.
As a further scheme: the shaft sleeve is made of high-temperature steam corrosion resistant material.
As a further scheme: the impeller is inserted into the main shaft through an impeller pull rod and connected with the main shaft.
Preferably: the impeller is provided with a locking nut at one end far away from the main shaft in a matching way with the impeller pull rod, and the locking nut is sleeved on the impeller pull rod.
The utility model discloses among the steam turbine mechanical seal structure: and a perfluoroether sealing ring is arranged between the shaft sleeve and the impeller.
The utility model discloses among the steam turbine mechanical seal structure: and a plurality of sealing rings are additionally arranged between the air sealing piece and the partition wall, and the sealing rings are perfluoroether sealing rings.
Compared with the prior art, the steam turbine mechanical sealing structure comprises a partition wall; the partition wall is rotationally connected with an impeller, and an axial high-low tooth labyrinth is formed by matching a chute formed in the fixed static partition wall and a gear boss fixed on the rotationally connected impeller; the structure also comprises a shaft sleeve, wherein the shaft sleeve is connected on the partition wall through an air seal piece in a penetrating way, and the impeller is rotationally connected inside the shaft sleeve; wherein, the shaft sleeve forms a radial high-low tooth labyrinth through the air seal pieces; the surface of the air sealing piece close to the partition wall is provided with a sealing groove, and a plurality of air release holes B communicated with the air release holes A formed in the partition wall are formed in the sealing groove; an inclined groove formed on the partition wall in a fixed static state is matched with a gear boss fixed on the impeller in a rotary connection state to form an axial high-low tooth labyrinth, and a shaft sleeve forms a radial high-low tooth labyrinth between air seal pieces; form the throttle passageway, normal operating steam will reduce through passageway steam temperature and pressure, and the seal groove is inside to be seted up a plurality ofly simultaneously and set up some bleeder holes B of bleeder hole A intercommunication on the partition wall, makes steam pressure reduce, and high temperature steam also can be introduced in bleeder hole A and bleeder hole B cooperation, ensures that sealed inside gas does not outwards reveal, and the leakproofness is good, the reliability is high, has reduced wearing and tearing, has improved life.
Drawings
Fig. 1 is a schematic structural view of a mechanical seal structure of a steam turbine according to the present invention.
In the figure: 1-an air inlet shell; 2-partition wall; 3-an impeller; 4-air sealing; 5-shaft sleeve; 6-a main shaft; 7-sealing ring; 8-a box body; 9-impeller pull rod; and 10, locking the nut.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to the following embodiments.
In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The carbon ring seal or other non-contact radial flat tooth seals are selected as the current mainstream for high-temperature and high-pressure steam at the present stage, and the defects of high manufacturing cost, short service life, poor reliability and the like cause that the high-temperature and high-pressure steam cannot be rapidly popularized and applied; the utility model aims to provide a steam turbine mechanical seal structure to solve above-mentioned problem, the sealing device that typical steam turbine machinery adopted is that the carbocycle seals or other non-contact radial flat tooth are sealed, and wherein the carbocycle seals to belong to the contact seal, and long-time work exists slight wearing and tearing, and the reliability is not high, adopts the radial flat tooth of non-contact to seal the effect not good promptly to the axial dimension is long, has reduced the problem of the rotor reliability of unit, the utility model aims to provide a steam turbine mechanical seal structure. In order to achieve the above object, the utility model provides a following technical scheme:
in the embodiment of the present invention, as shown in fig. 1, a mechanical seal structure for a steam turbine includes a partition wall 2; the partition wall 2 is rotatably connected with an impeller 3, and an axial high-low tooth labyrinth is formed by matching a chute formed on the fixed and static partition wall 2 with a gear boss fixed on the rotatably connected impeller 3; and then the labyrinth of high and low teeth between the partition wall 2 and the impeller 3 forms a throttling channel, and the temperature and pressure of the steam of the normal working steam passing through the channel are reduced;
the structure also comprises a shaft sleeve 5, wherein the shaft sleeve 5 is connected on the partition wall 2 in a penetrating way through an air seal piece 4, and the impeller 3 is rotatably connected inside the shaft sleeve 5; wherein, the shaft sleeve 5 forms a radial high-low tooth labyrinth through the air seal piece 4; the seal groove has been seted up on the face that is close to partition wall 2 to atmoseal spare 4, seal groove inside set up a plurality ofly with the partition wall 2 on set up some gas outlet B of gas outlet A intercommunication, make steam pressure reduce, high temperature steam can also be introduced in gas outlet A and the cooperation of gas outlet B, ensure that sealed inside gas does not outwards reveal.
In the embodiment of the utility model, the chute arranged on the fixed static partition wall 2 is matched with the gear boss fixed on the rotary connection-shaped impeller 3 to form an axial high-low tooth labyrinth, and the shaft sleeve 5 forms a radial high-low tooth labyrinth between the air seal pieces 4; form the throttle passageway, normal operating steam will reduce through passageway steam temperature and pressure, and the seal groove is inside to be seted up a plurality ofly simultaneously and the air vent B of seting up some air vent A intercommunications on the partition wall 2, makes steam pressure reduce, and high temperature steam also can be introduced in air vent A and the cooperation of air vent B, ensures that sealed inside gas is outwards not revealed, and the leakproofness is good, the reliability is high, has reduced wearing and tearing, has improved life.
In the embodiment of the present invention, as shown in fig. 1, the partition wall 2 is installed on the air intake casing 1; the air sealing pieces 4 are two unit air sealing pieces which are horizontally split and are fixedly assembled and fixed through screws and positioned by pins; a main shaft 6 fixed on the impeller 3 is inserted into the shaft sleeve 5; the main shaft 6 and the shaft sleeve 5 are in interference fit: the shaft sleeve 5 is made of a high-temperature steam corrosion resistant material; the impeller 3 is inserted into the main shaft 6 through an impeller pull rod 9 and connected with the main shaft 6. Preferably, the impeller 3 is provided with a locking nut 10 at one end away from the main shaft 6 in cooperation with the impeller pull rod 9, and the locking nut 10 is sleeved on the impeller pull rod 9.
In the embodiment of the present invention, as shown in fig. 1, a perfluoro ether sealing ring is disposed between the shaft sleeve 5 and the impeller 3; and a plurality of sealing rings 7 are additionally arranged between the air sealing part 4 and the partition wall 2, and the sealing rings 7 are perfluoroether sealing rings.
The utility model discloses a mechanical seal structure of a steam turbine, which comprises a partition wall 2; the partition wall 2 is rotatably connected with an impeller 3, and an axial high-low tooth labyrinth is formed by matching a chute formed on the fixed and static partition wall 2 with a gear boss fixed on the rotatably connected impeller 3; the structure also comprises a shaft sleeve 5, wherein the shaft sleeve 5 is connected on the partition wall 2 in a penetrating way through an air seal piece 4, and the impeller 3 is rotatably connected inside the shaft sleeve 5; wherein, the shaft sleeve 5 forms a radial high-low tooth labyrinth through the air seal piece 4; the air seal piece 4 is provided with a sealing groove on the surface close to the partition wall 2, and a plurality of air vents B communicated with the air vents A arranged on the partition wall 2 are arranged in the sealing groove; an axial high-low tooth labyrinth is formed by matching a chute formed on the fixed static partition wall 2 with a gear boss fixed on the rotary connection-shaped impeller 3, and a radial high-low tooth labyrinth is formed by the shaft sleeve 5 passing through the air seal piece 4; form the throttle passageway, normal operating steam will reduce through passageway steam temperature and pressure, and the seal groove is inside to be seted up a plurality ofly simultaneously and the air vent B of seting up some air vent A intercommunications on the partition wall 2, makes steam pressure reduce, and high temperature steam also can be introduced in air vent A and the cooperation of air vent B, ensures that sealed inside gas is outwards not revealed, and the leakproofness is good, the reliability is high, has reduced wearing and tearing, has improved life.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those skilled in the art.
Claims (10)
1. A steam turbine mechanical seal structure, comprising a partition wall;
the partition wall is rotationally connected with an impeller, and an axial high-low tooth labyrinth is formed by matching a chute formed in the fixed static partition wall and a gear boss fixed on the rotationally connected impeller;
the structure also comprises a shaft sleeve, wherein the shaft sleeve is connected on the partition wall through an air seal piece in a penetrating way, and the impeller is rotationally connected inside the shaft sleeve; wherein, the shaft sleeve forms a radial high-low tooth labyrinth through the air seal pieces;
the air seal piece is provided with a sealing groove on the surface close to the partition wall, and a plurality of air release holes B communicated with the air release holes A formed in the partition wall are formed in the sealing groove.
2. The steam turbine mechanical seal according to claim 1, wherein the partition is mounted to the inlet casing.
3. The steam turbine mechanical seal structure of claim 1, wherein the air seals are two flat split unit air seals fixed by screw fixation.
4. The steam turbine mechanical seal according to claim 1, wherein a main shaft fixed to the impeller is inserted through an inside of the boss.
5. The steam turbine mechanical seal of claim 4, wherein the main shaft and the bushing are an interference fit.
6. The steam turbine mechanical seal structure of claim 4, wherein the material of the sleeve is a high temperature steam corrosion resistant material.
7. The steam turbine mechanical seal structure of claim 4, wherein the impeller is inserted on the main shaft by an impeller pull rod to connect with the main shaft.
8. The steam turbine mechanical seal structure of claim 7, wherein the impeller has a lock nut at an end away from the main shaft that engages the impeller pull rod, and the lock nut is disposed on the impeller pull rod.
9. A steam turbine mechanical seal according to any of claims 1 to 8, wherein a perfluoroether seal ring is provided between the hub and the impeller.
10. A mechanical seal for a steam turbine according to any of claims 1 to 8, wherein a plurality of seal rings are interposed between the air seal and the partition wall, and the seal rings are perfluoroether seal rings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021859150.5U CN212296505U (en) | 2020-08-31 | 2020-08-31 | Mechanical sealing structure of steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021859150.5U CN212296505U (en) | 2020-08-31 | 2020-08-31 | Mechanical sealing structure of steam turbine |
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| CN212296505U true CN212296505U (en) | 2021-01-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111927567A (en) * | 2020-08-31 | 2020-11-13 | 重庆冲能动力机械有限公司 | Mechanical sealing structure of steam turbine |
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- 2020-08-31 CN CN202021859150.5U patent/CN212296505U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111927567A (en) * | 2020-08-31 | 2020-11-13 | 重庆冲能动力机械有限公司 | Mechanical sealing structure of steam turbine |
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