CN212455335U - Multi-chamber independent air bag flexible support hole type damping seal - Google Patents
Multi-chamber independent air bag flexible support hole type damping seal Download PDFInfo
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- CN212455335U CN212455335U CN202021968561.8U CN202021968561U CN212455335U CN 212455335 U CN212455335 U CN 212455335U CN 202021968561 U CN202021968561 U CN 202021968561U CN 212455335 U CN212455335 U CN 212455335U
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Abstract
A multi-chamber independent air bag flexible support hole type damping seal comprises a sealing liner, a flexible air bag and a sealing shell which are sequentially sleeved from inside to outside, wherein the sealing liner, the flexible air bag and the sealing shell are cylindrical barrels and have collinear axial leads; damping holes are uniformly distributed on the inner wall of the sealing lining, and the outer wall of the sealing lining is a smooth surface and is tightly attached to the flexible air bag; the flexible air bag comprises a plurality of metal film air bag units which are uniformly distributed along the axial direction and the circumferential direction and are connected with each other through connecting parts to form a whole; the outer surface of each film air bag unit is provided with an independently controlled air valve; the sealing shell is provided with through holes which correspond to the air valves one to one, and the air valves penetrate through the through holes to be connected with external air pipelines. The utility model discloses can effectively solve the problem that sealed tooth is worn and torn and make the vapor seal clearance grow by the rotor when the extreme operating mode of unit operation in the change self-adaptation accuse each part seal structure rigidity and damping of operating mode.
Description
Technical Field
The utility model relates to a rotatory turbo machine sealing technique especially relates to a multi-chamber independent gasbag flexible support pass damping is sealed.
Background
At present, with the increasing requirements of China on the utilization efficiency of energy, the impeller machinery of steam turbines, gas turbines and the like develops towards the directions of high efficiency, stability and high power, and the damage of the traditional sealing gap fluid excitation becomes more and more prominent. The leakage amount of the sealing clearance is reduced, the fluid excitation of the sealing clearance is inhibited, and the stability of the unit operation is ensured, so that the method becomes one of the key technologies of the modern impeller mechanical development. Analyzing the cause of the fluid exciting force shows that when the rotor operates and the circumferential clearance of the sealing cavity is not uniform, uneven pressure distribution is formed around the rotor, and the resultant force of the distributed pressure forms a tangential component perpendicular to the displacement to the rotor, so that the steam flow excitation of the labyrinth seal is caused. The sealing structure used by the existing rotary machine is generally labyrinth seal or honeycomb seal, the material is rigid body, and permanent abrasion can be caused once the rotary machine is touched and grinded. Also, the degree of wear increases as the rotor-stator gap increases. The uneven clearance after the production collision wear not only can increase and let out leakage quantity but also can aggravate the steam flow excitation phenomenon in sealed clearance, still can lead to seal structure's whole inefficacy when serious, buries down hidden danger for the safe operation of unit. In view of the above problems, the related scholars have proposed adjustable seals, such as patent CN 107559199 a, in which the seal gap between the rotor and the stator is adjusted by a spring. When the clearance between the rotor and the stator is large, the spring is extended to reduce the clearance. When the clearance between the rotor and the stator is small, the spring is compressed to maintain a small clearance. However, since the adjustable seal is a contact seal, the seal is easily worn by friction. In addition, under the conditions of high temperature, non-ideal sealing medium and the like, the spring is easy to scale and rust, so that the elasticity is failed, and the use of the spring is further influenced.
Secondly, the unit can experience a plurality of high load operating modes in the operating cycle, and the pivot can present the condition such as big beat, circumference off-centre, micro-vibrations at different moments. The rigidity requirements of the corresponding sealing structure are correspondingly different under the condition that the rotating shaft is unstable in different forms. For example, when the shaft vibrates greatly in a certain direction along the radial direction, the rigidity of the corresponding sealing structure in the direction is smaller, and the damping is larger, and the rigidity of the sealing structures in other directions is still higher, so that the stability of the whole sealing structure is maintained. Currently, flexible seals such as brush seals can ameliorate the disadvantages of rigid seals in this regard. However, the conventional flexible seal is limited in its use because it cannot be used under high temperature conditions. In conclusion, the existing rigid seal and flexible seal can not meet the requirements of low leakage, excellent dynamic property and strong self-adaption of the seal.
Disclosure of Invention
In order to overcome the problems, the utility model provides a multi-chamber independent air bag flexible support hole type damping seal with excellent dynamic characteristics and strong adaptability.
The utility model adopts the technical proposal that: a multi-chamber independent air bag flexible support hole type damping seal comprises a sealing liner, a flexible air bag and a sealing shell which are sequentially sleeved from inside to outside, wherein the sealing liner, the flexible air bag and the sealing shell are cylindrical barrels, the axial lines of the sealing liner, the flexible air bag and the sealing shell are on the same straight line, and one side close to the axial line is taken as the inner side, otherwise, the sealing liner, the flexible air bag and the sealing shell are taken as the outer side;
damping holes are uniformly distributed on the inner wall of the sealing lining, the damping holes do not penetrate through the sealing lining, and the outer wall of the sealing lining is a smooth surface and is tightly attached to the flexible air bag;
the flexible air bag comprises a plurality of metal film air bag units which are uniformly distributed along the axial direction and the circumferential direction and are connected with each other through connecting parts to form a whole; the outer surface of each film air bag unit is provided with an independently controlled air valve; the sealing shell is provided with through holes which correspond to the air valves one by one, and the air valves penetrate through the through holes to be connected with external air pipelines;
an opening at one end of the sealing shell extends inwards to form an annular edge, the inner edge of the annular edge is turned and folded towards the center of the sealing shell to form an annular clamping edge, and one ends of the sealing lining and the flexible air bag are clamped and embedded between the annular clamping edge and the sealing shell; and an annular sealing end cover is arranged at an opening at the other end of the sealing shell and is connected with the sealing shell through a bolt.
Furthermore, a first sealing groove is formed in one side, close to the sealing shell, of the inner wall ring of the sealing end cover, and a first sealing strip is placed in the first sealing groove; and a second annular sealing groove is arranged on the annular clamping edge of the sealing shell, and a second sealing strip is placed in the second annular sealing groove.
Further, the number of the metal film air bag units is 2-5 along the axial direction, and 4-8 along the circumferential direction.
Further, the hole pattern of the damping hole 4-1 is a hexagonal hole, a round hole, a triangular hole or a long strip.
The utility model has the advantages that:
(1) the structure can adaptively control the rigidity and the damping of the sealing structures of all parts according to the change of working conditions, and each air bag unit is independently arranged, so that each sealing structure can be independently controlled to form a sealing structure with the rigidity and the damping which are not uniform along the axial direction and the circumferential direction. Compared with the traditional self-adaptive sealing structure with the spring as the elastic element, the self-adaptive sealing structure has better dynamic response capability, shock and vibration resistance capability, longer service life and the like.
(2) The metal film air bags are introduced as spring elements, and when the sealing device has the conditions that the center lines of a rotating shaft and a sealing lining of the sealing device are not aligned after large load and large vibration and the sealing gap is deflected, the shape of the sealing gap can be corrected by adjusting the pressure in each air bag. In addition, the air valve of the air bag unit is connected with an external air path of the unit, so that remote autonomous control can be realized, and certain adaptability is provided for some mechanical parts which are not easy to install and maintain. The combined structure is simple, gives consideration to the advantages of rigidity and flexible sealing, has strong self-adaptability, and is a brand new sealing technology with good comprehensive performance, good sealing performance and excellent anti-collision and abrasion performance.
Drawings
Fig. 1 is a three-dimensional cross-sectional view of the present invention.
Fig. 2 is a three-dimensional structural view of the liner.
Fig. 3 is a three-dimensional structural view of a metal film airbag.
Fig. 4 is a three-dimensional structural view of the sealed case.
Fig. 5 is a three-dimensional structural view of the hermetic end cap.
Description of reference numerals: 1. sealing the housing; 1-1, through holes; 1-2, a second annular seal groove; 1-3, sealing the threaded hole of the shell; 2. a second seal strip; 3. a flexible bladder; 3-1, a connecting part; 3-2, a metal film airbag unit; 3-3, an air valve; 4. sealing the inner liner; 4-1, damping holes; 5. a housing end cap; 5-1, screw holes of the end cover of the shell; 5-2, a first sealing groove; 6. a first seal strip.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., appear based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
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" should be interpreted broadly, e.g., as being either 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 in specific cases to those skilled in the art.
Referring to the attached drawings, the multi-chamber independent air bag flexible supporting hole type damping seal comprises a sealing liner 4, a flexible air bag 3 and a sealing shell 1 which are sequentially sleeved from inside to outside, wherein the sealing liner 4, the flexible air bag 3 and the sealing shell 1 are cylindrical barrels, the axial lines of the sealing liner 4, the flexible air bag 3 and the sealing shell 1 are on the same straight line, and one side close to the axial line is the inner side, otherwise, the sealing liner is the outer side;
damping holes 4-1 are uniformly distributed on the inner wall of the sealing lining 4, the damping holes 4-1 do not penetrate through the sealing lining 4, and the hole pattern of the damping holes 4-1 is a hexagonal hole, a circular hole, a triangular hole or a strip. The outer wall of the sealing lining 4 is a smooth surface and is tightly attached to the flexible air bag 3;
the flexible air bag 3 comprises a plurality of metal film air bag units 3-2, wherein 2 to 5 metal film air bag units 3-2 are arranged along the axial direction and 4 to 8 metal film air bag units are arranged along the circumferential direction, and the plurality of metal film air bag units 3-2 are uniformly distributed along the axial direction and the circumferential direction and are connected with each other through connecting parts 3-1 to form a whole; the outer surface of each film air bag unit is provided with an air valve 3-3 which is independently controlled; the sealing shell 1 is provided with through holes 1-1 corresponding to the air valves 3-3 one by one, and the air valves 3-3 penetrate through the through holes 1-1 to be connected with external air pipelines.
An opening at one end of the sealing shell 1 extends inwards to form an annular edge, the inner edge of the annular edge is turned towards the center of the sealing shell 1 to form an annular clamping edge, and one ends of the sealing lining 4 and the flexible air bag 3 are clamped and embedded between the annular clamping edge and the sealing shell 1; an annular sealing end cover 5 is installed at an opening at the other end of the sealing shell 1, a plurality of shell end cover threaded holes 5-1 are circumferentially arranged on an assembly surface of the sealing end cover 5 for assembling with the sealing shell 1, and sealing shell threaded holes 1-3 which are in one-to-one correspondence with the shell end cover threaded holes 5-1 are arranged on the sealing shell 1;
a first sealing groove 5-2 is formed in one side, close to the sealing shell 1, of the inner wall ring of the sealing end cover 5, and a first sealing strip 6 is placed in the first sealing groove 5-2; the sealing end cover 5 is connected with the sealing shell 1 through bolts, and the first sealing strip 6 is compacted. A second annular sealing groove 1-2 is arranged on the annular clamping edge of the sealing shell 1, and a second sealing strip 2 is placed in the second annular sealing groove 1-2.
The structure is essentially a combined container type cylindrical surface seal, a multi-cavity metal film flexible air bag is introduced to wrap a rigid sealing lining, each metal film air bag unit is controlled independently, and an air valve penetrates out of a sealing shell to be connected with an outer air path. The two ends of the sealing liner, the sealing shell and the shell end cover respectively form a second sealing groove and a first sealing groove for installing a sealing gasket, and the soft first sealing strip and the soft second sealing strip are placed in the corresponding sealing grooves to be sealed so as to prevent inlet and outlet steam from entering the sealing structure. When the sealing structure is installed, the flexible air bag is firstly placed into the sealing shell, the sealing lining is tightly attached to the outside of the air bag and slides into the sealing shell, the second sealing strip is placed simultaneously, the sealing end cover is pressed after the first sealing strip is placed, the sealing end cover is assembled, the whole shaft end sealing position is pushed along the rotating shaft or the shaft sleeve of the turbine unit, and then the sealing structure can be fixed on the stator part of the turbine machine.
When the unit operates stably, the pressure of the air bag is increased to enable the air bag to bulge, and at the moment, the integral rigidity of the sealing structure is high, and the stability is high. On the contrary, when the rotating shaft of the unit vibrates and deflects seriously along a certain direction, the pressure of the corresponding air bag unit in the direction is reduced, and the buffering effect is increased. At the moment, the rigidity of the sealing structure in the direction is small, the damping is large, the sealing structures in other directions still keep high rigidity, and the relative stability of the whole sealing structure is kept while the sealing structure is prevented from being rubbed and abraded in the direction. In addition, the sealing device has misalignment between the rotating shaft of the sealing device and the central line of the sealing lining after large load and large vibration, and the sealing clearance can be corrected by adjusting the pressure value in each air bag when the sealing clearance is deflected. Meanwhile, when the rotating shaft vibrates or deflects regularly, the circumferential or axial air bag unit can be adjusted, and the sealing structure forms a sealing structure which has uneven axial or circumferential rigidity damping and is suitable for vibration.
The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, and the scope of the invention should not be considered limited to the specific forms set forth in the embodiments, but rather the scope of the invention is intended to include equivalent technical means as would be understood by those skilled in the art from the inventive concepts.
Claims (4)
1. A multi-chamber independent air bag flexible support hole type damping seal is characterized in that: the air bag sealing device comprises a sealing lining (4), a flexible air bag (3) and a sealing shell (1) which are sequentially sleeved from inside to outside, wherein the sealing lining (4), the flexible air bag (3) and the sealing shell (1) are cylindrical barrels, the axes of the sealing lining, the flexible air bag and the sealing shell are on the same straight line, and one side close to the axes is taken as the inner side, otherwise, the side is taken as the outer side;
damping holes (4-1) are uniformly distributed on the inner wall of the sealing lining (4), the damping holes (4-1) do not penetrate through the sealing lining (4), and the outer wall of the sealing lining (4) is a smooth surface and is tightly attached to the flexible air bag (3);
the flexible air bag (3) comprises a plurality of metal film air bag units (3-2), and the plurality of metal film air bag units (3-2) are uniformly distributed along the axial direction and the circumferential direction and are connected with each other through connecting parts (3-1) to form a whole; the outer surface of each film air bag unit is provided with an air valve (3-3) which is independently controlled; the sealing shell (1) is provided with through holes (1-1) which correspond to the air valves (3-3) one by one, and the air valves (3-3) penetrate through the through holes (1-1) to be connected with an external air pipeline;
an opening at one end of the sealing shell (1) extends inwards to form an annular edge, the inner edge of the annular edge is folded towards the center of the sealing shell (1) to form an annular clamping edge, and one ends of the sealing lining (4) and the flexible air bag (3) are clamped and embedded between the annular clamping edge and the sealing shell (1); an annular sealing end cover (5) is installed at an opening at the other end of the sealing shell (1), and the sealing end cover (5) is connected with the sealing shell (1) through bolts.
2. A multi-chamber independent bladder flexible support hole type damping seal as claimed in claim 1 wherein: a first sealing groove (5-2) is formed in one side, close to the sealing shell (1), of the inner wall ring of the sealing end cover (5), and a first sealing strip (6) is placed in the first sealing groove (5-2); a second annular sealing groove (1-2) is arranged on the annular clamping edge of the sealing shell (1), and a second sealing strip (2) is placed in the second annular sealing groove (1-2).
3. A multi-chamber independent bladder flexible support hole type damping seal as claimed in claim 1 wherein: the number of the metal film air bag units is 2-5 along the axial direction and 4-8 along the circumferential direction.
4. A multi-chamber independent bladder flexible support hole type damping seal as claimed in claim 1 wherein: the hole pattern of the damping hole (4-1) is a hexagonal hole, a round hole, a triangular hole or a strip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021968561.8U CN212455335U (en) | 2020-09-10 | 2020-09-10 | Multi-chamber independent air bag flexible support hole type damping seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021968561.8U CN212455335U (en) | 2020-09-10 | 2020-09-10 | Multi-chamber independent air bag flexible support hole type damping seal |
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| Publication Number | Publication Date |
|---|---|
| CN212455335U true CN212455335U (en) | 2021-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021968561.8U Active CN212455335U (en) | 2020-09-10 | 2020-09-10 | Multi-chamber independent air bag flexible support hole type damping seal |
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| Country | Link |
|---|---|
| CN (1) | CN212455335U (en) |
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- 2020-09-10 CN CN202021968561.8U patent/CN212455335U/en active Active
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