CN116006332A - Turbine casing-to-casing sealing structure based on Tesla valve sealing principle - Google Patents
Turbine casing-to-casing sealing structure based on Tesla valve sealing principle Download PDFInfo
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- CN116006332A CN116006332A CN202211536867.XA CN202211536867A CN116006332A CN 116006332 A CN116006332 A CN 116006332A CN 202211536867 A CN202211536867 A CN 202211536867A CN 116006332 A CN116006332 A CN 116006332A
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Abstract
The invention aims to provide a turbine casing-casing sealing structure based on a Tesla valve sealing principle, which comprises a first turbine casing and a second turbine casing, wherein the first turbine casing comprises a first casing body, the second turbine casing comprises a second casing body, a first outer connecting flange is arranged on the outer side of the first casing body, a first inner connecting flange is arranged on the inner side of the first casing body, a second outer connecting flange is arranged on the outer side of the second casing body, a second inner connecting flange is arranged on the inner side of the second casing body, the first inner connecting flange and the second inner connecting flange are connected together through mounting bolts in bolt holes, a bypass channel is formed in the first inner connecting flange, a bypass plate is formed in the second inner connecting flange, and the bypass plate is embedded into the bypass channel to form the Tesla valve sealing structure. The invention can solve the problem of gas sealing at the flange connection position of the turbine casing in the high-temperature high-pressure gas environment, thereby improving the reliability of the gas turbine and avoiding the leakage of the high-temperature high-pressure gas.
Description
Technical Field
The invention relates to a sealing structure of a gas turbine, in particular to a sealing structure between turbine casings.
Background
Compared with diesel engines and steam turbines, gas turbines have the advantages of high power density, high starting speed and the like, and have become a main power device of ships. In order to improve the unit efficiency and output power of the modern high-performance marine gas turbine, the temperature and pressure of the gas at the inlet of the turbine are continuously improved, and a great challenge is brought to the sealing of a turbine casing. The traditional turbine casing end face sealing method is that copper wires are arranged between the end faces of the connecting flanges, and the end faces of the two connecting flanges are pressed by using a whole circle of bolts, so that the copper wires are deformed to realize the sealing function of fuel gas. The method has the main defects that the copper wire can be uniformly compressed to obtain a good sealing effect only by setting the machining precision of the matching end face of the casing to be higher, and the requirements on production and assembly are higher. And after the turbine is used for a long time, the turbine casing is deformed due to expansion caused by heat and contraction caused by cold, the gap is increased, the copper wire has no elastic deformation capability, the newly generated gap cannot be made up, high-temperature and high-pressure gas leakage is caused, and potential danger is caused to gas turbine operators.
Although scholars and researchers at home and abroad have conducted a great deal of research on sealing of turbine casings and have made great progress in improving the sealing performance of turbines and reducing gas leakage, the research is mainly focused on filling sealing elements between the casings. The filled sealing element can obtain a better sealing effect in a short period, but after long-term contact with high-temperature and high-pressure fuel gas, the characteristics of the sealing element are deteriorated, and high-efficiency and reliable sealing performance cannot be obtained for a long period.
Disclosure of Invention
The invention aims to provide a turbine casing sealing structure based on a Tesla valve sealing principle, which can solve the problem of gas sealing at a flange connection position of a turbine casing in a high-temperature high-pressure gas environment, thereby improving the reliability of a gas turbine and avoiding leakage of high-temperature high-pressure gas.
The purpose of the invention is realized in the following way:
the invention discloses a turbine casing-to-casing sealing structure based on a Tesla valve sealing principle, which is characterized in that: including first turbine casing, second turbine casing, first turbine casing includes first casing body, second turbine casing includes the second casing body, the outside of first casing body sets up first outer flange, the inboard of first casing body sets up first internal connection flange, the outside of second casing body sets up second outer flange, the inboard of second casing body sets up second internal connection flange, first internal connection flange and second internal connection flange all set up the bolt hole, and install bolted connection together in the bolt hole between the two, first internal connection flange processing has the bypass passageway, second internal connection flange processing has the bypass board, the bypass board is embedded into the bypass passageway, constitute tesla valve seal structure.
The invention may further include:
1. and a reflux channel is arranged at the middle position of the flow around plate.
2. The reflux passage comprises 9 sections which are uniformly arranged.
3. When gas leaks through a gap between the first turbine casing and the second turbine casing, the gas firstly enters the Tesla valve sealing structure through the gap, flows through a rotary channel formed by the arc surface of the flow-around channel and the flow-around plate, and then rotates, flows out through the flow-around channel in a reverse direction, meets with the gas at the inlet, mixes with the gas flow, counteracts the kinetic energy of the gas flow, prevents the gas from continuously entering the Tesla valve sealing structure, and reduces the gas leakage between adjacent gas baffles.
4. The first casing body and the second casing body are of integral annular conical structures, the inner surfaces of the first casing body and the second casing body are smooth surfaces, and the end surfaces of the first inner connecting flange and the second inner connecting flange are smooth surfaces.
5. The bypass channel is recessed in the end face of the first inner connecting flange, and the bypass plate protrudes out of the end face of the second inner connecting flange.
The invention has the advantages that:
compared with the traditional structure, the sealing structure of the Tesla valve is simple in structure and high in stability, the flow-around channel of the end face of the casing is utilized to form the sealing structure of the Tesla valve, and the blocking effect generated by the rotation of fuel gas is utilized to reduce the leakage of the fuel gas and improve the tightness of the fuel gas. The reliability of the gas seal of the end face of the turbine casing is improved. The leakage of high-temperature high-pressure gas is avoided, and the risk of scalding gas turbine crew is reduced.
The present invention eliminates the need for packing sealing elements between the cases. The problems of sealing effect deterioration and the like caused by the characteristic deterioration of the sealing element after the sealing element contacts high-temperature high-pressure fuel gas for a long time are avoided.
The turbine casing with the Tesla valve sealing structure uses airflow to move reversely to offset the kinetic energy of the inlet airflow to seal, so that the turbine casing can not reduce the gas sealing effect even if a certain amount of deformation occurs after long-term working, and has long-term effective sealing capability.
Drawings
FIG. 1 is a schematic three-dimensional structure of a sealing structure between turbine cases according to the Tesla valve sealing principle of the present invention;
FIG. 2 is a cross-sectional view of a sealing structure between turbine cases based on Tesla valve sealing principle of the present invention;
fig. 3 is a cross-sectional view of the first turbine casing 1;
FIG. 4 is a cross-sectional view (B-B) of the second turbine casing 2;
FIG. 5 is a cross-sectional view (C-C) of the second turbine casing 2;
fig. 6 is an end view of the second turbine casing 2;
fig. 7 is a schematic diagram of a tesla valve seal arrangement.
Detailed Description
The invention is described in more detail below, by way of example, with reference to the accompanying drawings:
in connection with fig. 1-7, in order to realize the inter-turbine-casing sealing structure based on the tesla valve sealing principle, it is necessary to process the constituent parts of the tesla valve sealing structure in the turbine casing 1 and the turbine casing 2, respectively.
The turbine casing 1 and the turbine casing 2 are of annular structures made of GH4099 superalloy, and the inner surfaces of the turbine casing 1 and the turbine casing 2 are smooth surfaces so as to reduce gas flow loss.
As shown in fig. 3, the turbine casing 1 mainly comprises a connecting flange 1-1, a connecting flange 1-2, bolt holes 1-3, bolt holes 1-4, a bypass passage 1-5 and a casing body 1-6. The connecting flange 1-1 and the connecting flange 1-2 are fixed on the casing body 1-6, 32 circles of evenly distributed bolt holes 1-3 are formed in the connecting flange 1-1, 32 circles of evenly distributed bolt holes 1-4 are formed in the connecting flange 1-2, and a bypass channel 1-5 is arranged at the end face position of the right side of the connecting flange 1-1.
As shown in fig. 4, the turbine casing 2 mainly comprises a connecting flange 2-1, a connecting flange 2-2, bolt holes 2-3, bolt holes 2-4, a flow around plate 2-5, a backflow channel 2-6 and a casing body 2-7. The connecting flange 2-1 and the connecting flange 2-2 are fixed on the casing body 2-7, 32 circles of evenly distributed bolt holes 2-3 are formed in the connecting flange 2-1, 32 circles of evenly distributed bolt holes 2-4 are formed in the connecting flange 2-2, and a flow-around plate 2-5 is arranged at the end face of the left side of the connecting flange 2-1.
As shown in fig. 5 and 6, a flow-around plate 2-5 is arranged at the left end face of the turbine casing 2, and 9 sections of backflow channels 2-6 with the length of L are formed in the flow-around plate 2-5. The flow-around plate 2-5 is fixed on the connecting flange 2-1 by a connecting structure with the length L1.
The end face of the connecting flange of the turbine casing is a smooth surface, so that the sealing performance of the turbine casing is improved. The flow-around plate 2-5 protrudes out of the end face of the connecting flange, and the flow-around channel 1-5 is concave in the end face of the connecting flange.
The two turbine cases are connected through bolts and nuts which are uniformly arranged in a circle, and after the bolts and the nuts are screwed, the end faces of the connecting flanges of the two turbine cases are contacted with each other. The bypass plates 2-5 are embedded into the bypass channels 1-5 of the adjacent turbine casings, so that the bypass plates 2-5 and the bypass channels 1-5 are mutually matched to form a Tesla valve sealing structure. When gas is leaked through gaps between adjacent turbine cases, the gas can firstly enter the Tesla valve sealing structure through the gaps between the turbine cases, and when the gas flows through the arc-shaped surfaces of the bypass channels 1-5 and the rotary channels formed by the bypass plates 2-5, the gas rotates, then flows out through the backflow channels 2-6 in a reverse direction, meets the gas at the inlet at the point D by utilizing the inertia of the gas flow, mixes the gas, counteracts the kinetic energy of the gas flow, prevents the gas from continuously entering the Tesla valve sealing structure, and reduces the gas leakage between adjacent gas baffles.
Claims (6)
1. A turbine casing sealing structure based on Tesla valve sealing principle is characterized in that: including first turbine casing, second turbine casing, first turbine casing includes first casing body, second turbine casing includes the second casing body, the outside of first casing body sets up first outer flange, the inboard of first casing body sets up first internal connection flange, the outside of second casing body sets up second outer flange, the inboard of second casing body sets up second internal connection flange, first internal connection flange and second internal connection flange all set up the bolt hole, and install bolted connection together in the bolt hole between the two, first internal connection flange processing has the bypass passageway, second internal connection flange processing has the bypass board, the bypass board is embedded into the bypass passageway, constitute tesla valve seal structure.
2. The turbine casing-casing sealing structure based on the tesla valve sealing principle according to claim 1, wherein the turbine casing-casing sealing structure is characterized in that: and a reflux channel is arranged at the middle position of the flow around plate.
3. The turbine casing-casing sealing structure based on the tesla valve sealing principle according to claim 1, wherein the turbine casing-casing sealing structure is characterized in that: the reflux passage comprises 9 sections which are uniformly arranged.
4. The turbine casing-casing sealing structure based on the tesla valve sealing principle according to claim 2, wherein: when gas leaks through a gap between the first turbine casing and the second turbine casing, the gas firstly enters the Tesla valve sealing structure through the gap, flows through a rotary channel formed by the arc surface of the flow-around channel and the flow-around plate, and then rotates, flows out through the flow-around channel in a reverse direction, meets with the gas at the inlet, mixes with the gas flow, counteracts the kinetic energy of the gas flow, prevents the gas from continuously entering the Tesla valve sealing structure, and reduces the gas leakage between adjacent gas baffles.
5. The turbine casing-casing sealing structure based on the tesla valve sealing principle according to claim 1, wherein the turbine casing-casing sealing structure is characterized in that: the first casing body and the second casing body are of integral annular conical structures, the inner surfaces of the first casing body and the second casing body are smooth surfaces, and the end surfaces of the first inner connecting flange and the second inner connecting flange are smooth surfaces.
6. The turbine casing-casing sealing structure based on the tesla valve sealing principle according to claim 1, wherein the turbine casing-casing sealing structure is characterized in that: the bypass channel is recessed in the end face of the first inner connecting flange, and the bypass plate protrudes out of the end face of the second inner connecting flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211536867.XA CN116006332A (en) | 2022-12-01 | 2022-12-01 | Turbine casing-to-casing sealing structure based on Tesla valve sealing principle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211536867.XA CN116006332A (en) | 2022-12-01 | 2022-12-01 | Turbine casing-to-casing sealing structure based on Tesla valve sealing principle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116006332A true CN116006332A (en) | 2023-04-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211536867.XA Pending CN116006332A (en) | 2022-12-01 | 2022-12-01 | Turbine casing-to-casing sealing structure based on Tesla valve sealing principle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116006332A (en) |
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2022
- 2022-12-01 CN CN202211536867.XA patent/CN116006332A/en active Pending
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