CN111043317A - Novel dynamic pressure damping seal structure - Google Patents
Novel dynamic pressure damping seal structure Download PDFInfo
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- CN111043317A CN111043317A CN201911399244.0A CN201911399244A CN111043317A CN 111043317 A CN111043317 A CN 111043317A CN 201911399244 A CN201911399244 A CN 201911399244A CN 111043317 A CN111043317 A CN 111043317A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
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Abstract
The invention discloses a novel dynamic pressure damping sealing structure which is characterized by comprising a sealing rotor component and a sealing stator component which is sleeved outside the sealing rotor component and is matched with the sealing rotor component; the sealed rotor component has a plurality of micro-impellers disposed on a surface thereof and the sealed stator component has a textured structure disposed on an inner surface thereof. When the rotor part rotates, the miniature impellers on the surface of the rotor part can generate dynamic pressure pumping effect to drive fluid among the miniature impellers to flow towards the sealing inlet, and axial positive direction leakage flow generated by pressure difference of the sealing inlet and the sealing outlet is partially offset, so that the aims of obviously reducing the sealing leakage flow and improving the operation efficiency of the rotary machine are fulfilled. Meanwhile, the stator component is provided with a texture structure, so that the surface roughness and the sealing damping of the stator component can be obviously increased, the circumferential rotational flow development of fluid in a gap between the sealed rotor component and the stator component is effectively inhibited, and the circumferential component of the fluid exciting force is reduced, thereby achieving the purpose of enhancing the system stability.
Description
Technical Field
The invention belongs to the technical field of rotary machinery, and particularly relates to a novel dynamic pressure damping sealing structure which is suitable for gaps between rotor parts and stator parts of rotary machinery such as pumps, compressors, turbines and the like.
Background
The rotary sealing device is one of important components of modern rotary machines such as pumps, compressors, turbines and the like. The rotary sealing device is usually installed at the clearance between a rotor part and a stator part, such as a shaft end, a blade tip clearance and the like of the rotary machine, and the operation efficiency of the rotary machine is improved by reducing the working medium leakage flow from a high-pressure end to a low-pressure end at the clearance. In addition, rotary sealing devices are also commonly applied to rotary machines in the fields of petrochemical industry and the like to prevent working media from leaking and polluting the environment. Therefore, the development of advanced rotary sealing technology has great engineering significance for improving the efficiency of rotary machinery, saving energy consumption and reducing environmental pollution.
The rotary seal device can also induce fluid exciting force to act on the surface of the rotor part when limiting the leakage flow in the clearance between the rotor part and the stator part, and the stability of a rotor bearing system is influenced. Particularly, in the liquid phase working medium rotating machine, the liquid phase working medium has high density, high viscosity and incompressibility, so that the fluid excitation force is more remarkable. Therefore, the development of a liquid phase sealing technology with excellent sealing performance and rotor stability is very important for improving the efficiency of the rotating machinery and ensuring the safety and stability of the unit operation.
In liquid phase rotary machines, rotary seal devices commonly used include labyrinth seals and spiral seals. The labyrinth sealing device is generally characterized in that circumferential annular grooves are arranged on the surface of a stator part or the surface of a rotor part, and the labyrinth sealing device has the advantages of simple structure, easiness in installation and the like, but the sealing effect is poor, and the sealing requirement of rotary machinery under most conditions can not be met. The spiral seal is a sealing device with a spiral groove structure arranged on the surface of a stator component or a rotor component, and the sealing principle is that when a rotor rotates, resultant force of fluid in the spiral groove drives fluid in the spiral groove to flow to a sealing inlet along the spiral groove, leakage flow in the axial positive direction caused by pressure difference of the sealing inlet and the sealing outlet is partially counteracted, and accordingly sealing leakage flow is reduced. The sealing capability of the spiral seal is in direct proportion to the square of the rotating speed, so that the sealing performance is excellent under the condition of high rotating speed, even the complete sealing can be realized, but the sealing capability of the spiral seal is poor under the conditions of low rotating speed such as start and stop of a unit and the like. In addition, the leakage flow in the spiral sealing spiral groove has a large circumferential speed, so that a large circumferential fluid excitation force is caused, and the stability of a rotor bearing system is not facilitated. At present, higher requirements are provided for the efficiency and stability of the rotating machine under the operating environment with higher rotating speed, pressure and temperature, and the common labyrinth seal and spiral seal can not meet the requirements of the modern liquid phase rotating machine gradually.
The development of modern industrial technology puts higher requirements on economy, safety and environmental friendliness on rotary machines. Therefore, the development of a higher-performance liquid phase rotary machine sealing device has great engineering significance for improving the efficiency of the rotary machine, saving energy consumption, improving the safety and stability of the rotary machine and reducing environmental pollution.
Disclosure of Invention
The invention provides a novel dynamic pressure damping sealing device aiming at the requirements of reducing leakage amount, increasing stability and the like of the sealing device in a liquid phase rotating machine. This dynamic pressure damping sealing device has arranged miniature impeller at sealed rotor part surface, miniature impeller is to rotor part direction of rotation slope, can produce dynamic pressure pumping effect when sealed rotor part rotates, rely on the thrust of miniature impeller side wall face, promote the flow of miniature inter-impeller fluid to axial negative direction (burden Z direction), greatly reduced leaks the leakage, promote sealed ability of obturating, and simultaneously, texture structure has been arranged on this sealed stator part surface, can effectively restrain the interior circumferential whirl in the seal clearance, increase sealed stator part surface roughness and damping coefficient, and stability is improved.
The invention is realized by adopting the following technical scheme:
a novel dynamic pressure damping sealing structure comprises a sealing rotor component and a sealing stator component which is sleeved outside the sealing rotor component and is matched with the sealing rotor component; wherein the surface of the sealed rotor component is provided with a plurality of miniature impellers, and the inner surface of the sealed stator component is provided with a texture structure.
A further improvement of the present invention is that the plurality of micro-impellers arranged on the surface of the sealed rotor member are all inclined towards the rotation direction of the rotor member, and the included angle between the chord line of the micro-impellers and the axial direction of the sealed rotor member is the micro-impeller inclination angle α.
A further improvement of the invention is that the included angle α of the impeller is between 0 and 90 degrees.
A further improvement of the invention is that the micro-impellers arranged at different locations on the surface of the seal rotor member have different micro-impeller inclination angles, micro-impeller thicknesses, micro-impeller heights, micro-impeller lengths and cross-sectional shapes.
A further improvement of the invention is that the surface of the sealed rotor member is arranged with micro-impellers having axially varying micro-impeller heights.
The invention further improves that the miniature impeller arranged on the surface of the sealing rotor part is crescent, herringbone or spiral groove, and the impeller profile can be optimally designed.
A further improvement of the invention is that the micro-impeller sealing the surface arrangement of the rotor components can be replaced by a thread structure with a dynamic pressure pumping effect.
The invention is further improved in that the inner surface of the sealing stator component is provided with a texture structure formed by interlacing a plurality of spiral grooves with opposite rotation directions.
A further improvement of the invention is that the textured structure disposed on the inner surface of the sealing stator component has a different number of helical grooves, as well as a helical groove depth.
The invention is further improved in that the texture structure arranged on the inner surface of the sealing stator component is one of a cylindrical hole, a triangular hole, a rectangular groove and a rhombic groove which can increase the surface roughness of the stator component.
The invention has at least the following beneficial technical effects:
according to the invention, the miniature impellers which are inclined towards the rotation direction of the rotor component are arranged on the surface of the sealing rotor component, when the sealing rotor component rotates, the side wall surfaces of the miniature impellers apply thrust perpendicular to the side wall surfaces of the impellers to fluid between the miniature impellers, and the thrust pushes the fluid between the miniature impellers to flow in the axial negative direction, so that the leakage flow in the axial positive direction caused by the pressure difference of the sealing inlet and the sealing outlet is partially counteracted, and the sealing capability is greatly improved. According to the invention, the texture structure is arranged on the surface of the sealing stator component, so that the circumferential rotational flow development in the gap between the rotor component and the stator component is effectively limited, the sealing damping coefficient is improved, and the sealing stability is obviously enhanced. Therefore, the invention can effectively reduce the sealing leakage flow, improve the operation efficiency of the rotary machine and enhance the stability of the system.
Drawings
Fig. 1 is a three-dimensional model structure diagram of a novel dynamic pressure damping sealing device of the invention.
Figure 2 is a three-dimensional model block diagram of a sealed rotor component of the present invention.
Figure 3 is an enlarged partial view of the surface at a of the sealed rotor component of the present invention.
Figure 4 is an enlarged partial view of the surface at B of the sealed rotor component of the present invention.
Fig. 5 is a three-dimensional model of the sealing stator assembly of the present invention.
Fig. 6 is a partial enlarged view of the surface at C of the sealing stator member of the present invention.
Description of reference numerals:
1 is a sealed rotor part; 2 is a sealing stator component; 3 is a miniature impeller; 4 is a texture structure; 5 is the middle chord line of the miniature impeller; 6 is the thickness of the miniature impeller; 7 is the height of the miniature impeller; 8 is the length of the miniature impeller; 9 is the side wall surface of the miniature impeller; 10 is fluid thrust N; 11 is the fluid thrust circumferential component Nc(ii) a 12 is the axial component N of the fluid thrustz。
Detailed Description
The present invention is described in further detail below with reference to the attached drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, and the protection scope of the present invention is not limited thereby.
Referring to fig. 1 to 6, the novel dynamic pressure damping sealing structure provided by the present invention includes a sealing rotor component 1, and a sealing stator component 2 sleeved outside the sealing rotor component 1 for use; wherein, a plurality of miniature impellers 3 capable of generating dynamic pressure pumping effect are arranged on the surface of the sealing rotor component 1, and a texture structure 4 capable of inhibiting the development of circumferential rotational flow and increasing the damping coefficient is arranged on the inner surface of the sealing stator component 2.
Further, the micro vanes 3 arranged on the surface of the sealed rotor part 1 are all inclined towards the rotation direction of the rotor part, the included angle between the chord line 5 of the micro vanes and the axial direction (i.e. the Z direction) of the sealed rotor part 1 is the micro vane inclination angle α, and the micro vane inclination angle α arranged on the surface of the sealed rotor part 1 is between 0 and 90 °.
Further, the micro-impellers 3 arranged at different positions on the surface of the seal rotor member 1 have different micro-impeller inclination angles, micro-impeller thicknesses 6, micro-impeller heights 7, micro-impeller lengths 8, and cross-sectional shapes. The micro-impellers 3 arranged on the surface of the sealed rotor part 1 have a micro-impeller height 7 that varies in the axial direction.
Further, the miniature impeller 3 arranged on the surface of the sealed rotor component 1 is in a crescent shape, a herringbone shape or a spiral groove, and the impeller profile can be optimally designed. The micro-impeller 3 arranged on the surface of the sealing rotor part 1 can be replaced by a thread structure with dynamic pressure pumping effect.
Referring to figure 4, as the seal rotor member 1 rotates, fluid between the micro-impellers 3 is subjected to a fluid thrust N10 by the side wall surfaces 9 of the micro-impellers, the fluid thrust N10 having a circumferential component N with respect to the fluid thrust c11 and axial component N of the thrust of the fluid in the axially negative direction z12. Wherein the fluid thrust circumferential component N c11 same as the rotation direction of the rotor, axial component N of fluid thrust z12 is the axial negative direction. The thrust forces the inter-micro impeller fluid to flow in a negative axial direction along the flow channels between the micro impellers.
Referring to fig. 1, 5 and 6, a texture structure 4 formed by interlacing a plurality of spiral grooves with opposite rotation directions is arranged on the inner surface of the sealing stator component 2. The texture 4 arranged on the inner surface of the sealing stator part 2 has a different number of helical grooves, as well as the depth of the helical grooves. The texture structure 4 arranged on the inner surface of the sealing stator component 2 is one of a cylindrical hole, a triangular hole, a rectangular groove and a rhombic groove which can increase the surface roughness of the stator component. In addition, the surface texture 4 of the sealing stator component 2 can be a porous medium material.
The technical principle of the invention is as follows:
the invention provides a novel dynamic pressure damping sealing device. The device arranges a miniature impeller 3 with dynamic pressure pumping effect on the surface of a sealing rotor part 1 and arranges a texture structure 4 for increasing surface roughness on the surface of a sealing stator part 2.
The invention relates to a novel dynamic pressure damping seal, wherein a miniature impeller 3 with dynamic pressure pumping effect is arranged on the surface of a sealing rotor component 1, when the sealing rotor component 1 rotates, the fluid between the miniature impellers is subjected to a fluid thrust N10 of a side wall surface 9 of the miniature impeller through force analysis, and because a chord line in the miniature impeller 3 forms a certain angle α with the axial direction, the thrust has a fluid thrust circumferential component N which is the same with the rotation direction of the rotor component c11 and axial component N of fluid thrustzNeglecting the friction force, the fluid between the miniature impellers flows along the channel between the miniature impellers in the axial negative direction under the action of the thrust force to generate a dynamic pressure pumping effect, and the leakage flow in the axial positive direction generated by the action of the pressure difference of the sealed inlet and the sealed outlet is counteracted, so that the sealing leakage flow is obviously reduced. In addition, numerical simulation results have demonstrated that when a miniature impeller with a dynamic pressure pumping effect is arranged on the surface of the seal rotor part 1, the amount of seal leakage is significantly reduced compared with a smooth rotor.
Previous literature research shows that the fluid exciting force in the seal is generated due to the fact that the working medium pressure in the seal is not uniformly distributed in the circumferential direction due to dynamic eccentricity of a rotor component. The component of the fluid excitation force in the seal in the direction perpendicular to the rotor eccentricity is the main cause of induced rotor instability. Therefore, the development of the circumferential rotational flow in the sealing device is limited, and the circumferential component of the airflow exciting force is further reduced, so that the method is an effective way for improving the stability of the sealing device. According to the novel dynamic pressure damping sealing structure provided by the invention, the texture structure 4 for increasing the surface roughness is arranged on the surface of the stator component, so that the surface roughness of the sealing stator component is increased, when fluid in the sealing gap enters the texture structure on the surface of the sealing stator component 2, the kinetic energy of the fluid in the texture structure 4 is dissipated and converted into the internal energy of the fluid, and the circumferential rotational flow development of the fluid in the sealing gap is effectively inhibited. Therefore, the circumferential component of the exciting force of the fluid in the seal is reduced, and the stability is improved.
The foregoing is only a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that various modifications may be made without departing from the technical spirit of the present invention, and such modifications should be construed as being included in the scope of the present invention.
Claims (10)
1. A novel dynamic pressure damping sealing structure is characterized by comprising a sealing rotor component (1) and a sealing stator component (2) which is sleeved outside the sealing rotor component (1) and is matched with the sealing rotor component for use; wherein the content of the first and second substances,
a plurality of miniature impellers (3) are arranged on the surface of the sealing rotor component (1), and a texture structure (4) is arranged on the inner surface of the sealing stator component (2).
2. A novel dynamic pressure damping sealing structure according to claim 1, characterized in that a plurality of micro-impellers (3) arranged on the surface of the sealing rotor component (1) are all inclined towards the rotation direction of the rotor component, and the included angle between the chord line (5) of the micro-impellers and the axial direction of the sealing rotor component (1) is the micro-impeller inclination angle α.
3. A novel dynamic pressure damping seal structure according to claim 2, characterized in that the inclination angle α of the micro-impeller arranged on the surface of the seal rotor member (1) is between 0-90 °.
4. A novel dynamic pressure damping seal structure according to claim 2, characterized in that the micro-impellers (3) arranged at different positions on the surface of the seal rotor component (1) have different micro-impeller inclination angles, micro-impeller thicknesses (6), micro-impeller heights (7), micro-impeller lengths (8) and cross-sectional shapes.
5. A new dynamic pressure damping seal configuration according to claim 2, characterized in that the micro-impellers (3) arranged on the surface of the seal rotor member (1) have axially varying micro-impeller heights (7).
6. A new dynamic pressure damping seal structure according to claim 2, characterized in that the miniature impeller (3) arranged on the surface of the seal rotor component (1) is crescent, herringbone or spiral groove, and the impeller profile can be optimally designed.
7. A new dynamic pressure damping seal structure according to claim 2, characterized in that the micro-impeller (3) arranged on the surface of the sealing rotor part (1) can be replaced by a thread structure with dynamic pressure pumping effect.
8. The novel dynamic pressure damping seal structure according to claim 1, characterized in that the texture structure (4) formed by the interlacing of a plurality of spiral grooves with opposite rotation directions is arranged on the inner surface of the seal stator component (2).
9. A new dynamic pressure damping seal configuration according to claim 1, characterized by the fact that the textured structure (4) arranged on the inner surface of the sealing stator member (2) has different number of helical grooves, and depth of helical grooves.
10. A new dynamic pressure damping seal configuration according to claim 1, characterized in that the textured structure (4) arranged on the inner surface of the sealing stator member (2) is one of cylindrical holes, triangular holes, rectangular and diamond-shaped grooves capable of increasing the surface roughness of the stator member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911399244.0A CN111043317A (en) | 2019-12-30 | 2019-12-30 | Novel dynamic pressure damping seal structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911399244.0A CN111043317A (en) | 2019-12-30 | 2019-12-30 | Novel dynamic pressure damping seal structure |
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| Publication Number | Publication Date |
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| CN111043317A true CN111043317A (en) | 2020-04-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911399244.0A Pending CN111043317A (en) | 2019-12-30 | 2019-12-30 | Novel dynamic pressure damping seal structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111720175A (en) * | 2020-06-23 | 2020-09-29 | 中国科学院工程热物理研究所 | Impeller machinery movable vane top seal structure |
| CN112112976A (en) * | 2020-07-27 | 2020-12-22 | 西安交通大学 | Novel tooth sealing structure capable of enhancing sealing performance |
| CN113027539A (en) * | 2021-03-16 | 2021-06-25 | 中国联合重型燃气轮机技术有限公司 | Gas turbine and rotary damping seal for a gas turbine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2859108Y (en) * | 2005-07-28 | 2007-01-17 | 上海大学 | Separate spiral labyrinth sealing device |
| CN106949245A (en) * | 2017-03-07 | 2017-07-14 | 西安交通大学 | It is a kind of from spin-ended convergence type rotary seal structure |
-
2019
- 2019-12-30 CN CN201911399244.0A patent/CN111043317A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2859108Y (en) * | 2005-07-28 | 2007-01-17 | 上海大学 | Separate spiral labyrinth sealing device |
| CN106949245A (en) * | 2017-03-07 | 2017-07-14 | 西安交通大学 | It is a kind of from spin-ended convergence type rotary seal structure |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111720175A (en) * | 2020-06-23 | 2020-09-29 | 中国科学院工程热物理研究所 | Impeller machinery movable vane top seal structure |
| CN111720175B (en) * | 2020-06-23 | 2022-04-19 | 中国科学院工程热物理研究所 | Impeller machinery movable vane top seal structure |
| CN112112976A (en) * | 2020-07-27 | 2020-12-22 | 西安交通大学 | Novel tooth sealing structure capable of enhancing sealing performance |
| CN113027539A (en) * | 2021-03-16 | 2021-06-25 | 中国联合重型燃气轮机技术有限公司 | Gas turbine and rotary damping seal for a gas turbine |
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Application publication date: 20200421 |