CN111306301A - Rotary vane type high-temperature high-pressure gas (liquid) elastic contact dynamic sealing device and preparation method - Google Patents
Rotary vane type high-temperature high-pressure gas (liquid) elastic contact dynamic sealing device and preparation method Download PDFInfo
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- CN111306301A CN111306301A CN202010221829.XA CN202010221829A CN111306301A CN 111306301 A CN111306301 A CN 111306301A CN 202010221829 A CN202010221829 A CN 202010221829A CN 111306301 A CN111306301 A CN 111306301A
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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
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
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- Structures Of Non-Positive Displacement Pumps (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
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Abstract
The invention provides a rotary vane type high-temperature high-pressure gas (liquid) elastic contact dynamic sealing device, which has a sealing effect higher than that of honeycomb sealing and brush sealing and has a service life longer than that of packing sealing and brush sealing. The dynamic sealing device comprises a first sealing base body, a second sealing base body and a sealing sheet set, wherein the first sealing base body and the second sealing base body are of annular structures and are coaxially and axially spliced, so that a circle of groove is formed on the integral inner side of the first sealing base body and the second sealing base body; the sealing plate group consists of a plurality of fins which are distributed in the circle of groove and are inclined along the circumferential direction and the axial direction of the rotating shaft; the fixed end of the fin is connected with the first sealing base body and/or the second sealing base body, and the free end of the fin is flush with the top surface of the circle of groove or slightly extends out of the circle of groove, so that the fin is just contacted with the rotating shaft or forms elastic contact with pretightening force.
Description
Technical Field
The invention relates to a radial dynamic sealing device in a high-temperature and high-pressure state and a preparation method thereof.
Background
The dynamic seal of high-temperature and high-pressure gas mainly comprises soft and hard packing seal, labyrinth seal, piston ring seal and brush seal at present. The core of the seal is that the leakage amount of the sealing medium in unit time is reduced as much as possible under the same condition.
The soft packing is sealed under proper packing and structure, the highest applicable pressure is 35MPa, the temperature is 600 ℃, the linear velocity is 20m/s, the sealing requirement under the general condition can be met, the packing is easy to be hardened under the open fire condition, and the abrasion compensation is insufficient; the hard-pack seal uses a pressure of 350MPa, line speed of 12m/s, which requires cooling or heating of the pack.
The labyrinth seal is formed by forming a small tortuous gap between the rotating part and the fixed part, and the fluid is throttled for many times to achieve the sealing purpose. It belongs to non-contact seal, and the sealed effect is far less than contact seal.
The piston ring seal is a high-temperature high-pressure gas seal structure of the most common engine and similar structures in the prior art, and the piston ring seal has the advantages of low working condition adaptability and easy abrasion because the piston ring seal needs to work under the conditions of continuous lubrication and cooling.
The brush seal is taken as the key technology of modern turbo machinery, and the contact surface of the brush seal is 120 pieces/mm2The metal wire group grows on the forming substrate to be manufactured, the production and manufacturing are difficult, the cost is high, and the lubricating and cooling conditions are high. In addition, the brush seal has the phenomena of poor sealing, wire falling, serious brushing of the brush wire to the shaft and the like.
Disclosure of Invention
The invention aims to provide a rotary-vane high-temperature high-pressure gas (liquid) elastic contact dynamic sealing device and a preparation method thereof, which further improve the sealing effect and prolong the service life.
The technical scheme of the invention is as follows:
a rotary-vane high-temperature high-pressure gas (liquid) elastic contact dynamic sealing device is characterized in that: the sealing structure comprises a first sealing base body, a second sealing base body and a sealing sheet set, wherein the first sealing base body and the second sealing base body are both of annular structures and are coaxially and axially spliced, so that a circle of groove is formed on the integral inner sides of the first sealing base body and the second sealing base body; the sealing plate group consists of a plurality of fins which are distributed in the circle of groove and are inclined along the circumferential direction and the axial direction of the rotating shaft; the fixed end of the fin is connected with the first sealing base body and/or the second sealing base body, and the free end of the fin is flush with the top surface of the circle of groove or slightly extends out of the circle of groove, so that the fin is just contacted with the rotating shaft or forms elastic contact with pretightening force.
Further, the plurality of fins are uniformly distributed in the circle of grooves.
Further, the plurality of fins are inclined in the circumferential direction of the rotating shaft, specifically, in the rotating direction of the rotating shaft. More preferably, the plurality of fins are uniformly distributed along the circumferential direction of the rotating shaft at the same inclination angle of 30 ° to 70 °.
Further, the plurality of fins are inclined in the axial direction, in particular, in the incoming flow direction of the medium. More preferably, the plurality of fins have an inclination angle of 0 ° to 5 ° in the axial direction.
Further, the sealing sheet group 3 is composed of 1000 and 30000 fins.
Furthermore, the first sealing base body and the second sealing base body are both provided with clamping grooves for mounting the sealing sheet group and controlling the mounting angle of the sealing sheet group.
Further, the material of the fin is cobalt-based alloy or nickel-based alloy.
The invention also provides equipment applying the dynamic sealing device, which comprises a machine shell, a rotating shaft and an end cover, wherein a first sealing base body and a second sealing base body of the dynamic sealing device respectively correspond to a low-pressure side and a high-pressure side in the machine shell; the rotary-vane high-temperature high-pressure gas (liquid) elastic contact dynamic sealing device is arranged at a step in the casing and is compressed by an end cover, and the rotary shaft penetrates through the axis of the annular structure and is tangent to the whole inner sides of the first sealing base body and the second sealing base body and is in contact with the plurality of fins.
The invention also provides a preparation method for preparing the rotary vane type high-temperature high-pressure gas (liquid) elastic contact dynamic sealing device, which is characterized by comprising the following steps of:
the sealing ring is arranged at the step in the shell and is pressed tightly by an end cover, and the rotating shaft penetrates through the center of the sealing ring and is tangent to the sealing surface of the sealing ring;
the method specifically comprises the following steps: the sealing sheets are arranged in the middle of the first sealing base body and the second sealing base body and are uniformly distributed along the circumferential direction at the same inclination angle of 30-70 degrees; the first sealing base body and the second sealing base body are both provided with clamping grooves for mounting the sealing sheet and controlling the mounting angle of the sealing sheet, and the sealing ring is formed by rotating and inclining in the axial direction or the direction perpendicular to the circular plane according to a set angle while inclining in the circumferential direction.
The invention has the following beneficial effects:
due to the unique rotary-vane type sealing design, the fin-shaped design of the sealing sheet group and the inclination of the circumferential direction of the sealing sheet group (preferably arranged to be inclined in the axial rotation direction) ensure that the sealing sheet group has good elastic yielding effect, reduces abrasion and prolongs the service life; the inclined structure in the circumferential direction enables the sealing ring to have a blocking effect on the axial incoming flow, and the sealing effect is enhanced; the sealing sheet group is connected with the clamping groove of the base body, so that the sealing sheet group is reliably connected without falling off. For summary, the sealing effect is superior to labyrinth sealing and brush sealing, the elastic contact is realized, the abrasion is small, the service life is superior to that of packing sealing and brush sealing, the use effect is stable, the shedding phenomenon is avoided, and the lubrication and cooling are not needed under special working conditions.
The invention can be widely applied to the application field of high-temperature and high-pressure gas (liquid) dynamic sealing of equipment such as steam turbines, gas turbines, rotor engines, natural gas deep sea petroleum and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of one embodiment of the present invention; wherein, a is a cross-sectional view, and b is a side view (partial cross section) of a; in the figure: 1-first sealing substrate, 2-second sealing substrate, 3-sealing sheet group.
FIG. 2 is a schematic view of a tilted arrangement of a sealing sheet set;
FIG. 3 is a schematic diagram of an application of the embodiment shown in FIG. 1; in the figure, 5-machine shell, 6-rotating shaft, 7-end cover and 8-sealing ring.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and fig. 2, a rotary-vane high-temperature and high-pressure gas (liquid) elastic contact dynamic sealing device mainly comprises a first sealing substrate 1, a second sealing substrate 2 and a sealing sheet set 3 (about 1000-30000 sheets).
The first sealing base body (1) and the second sealing base body (2) are both of annular structures, and are coaxially and axially spliced, so that a circle of groove is formed on the inner sides of the first sealing base body (1) and the second sealing base body (2) integrally; the sealing sheet group 3 consists of a plurality of fins (narrow slits with certain sizes are symmetrically arranged on two sides of the fin-shaped structure to enhance the elasticity of the sealing sheet group), and the plurality of fins are distributed in the circle of groove and are inclined along the circumferential direction and the axial direction of the rotating shaft; the fixed end of the fin is connected with the first sealing base body 1 and/or the second sealing base body 2, and the free end of the fin is flush with the top surface of the circle of groove or slightly extends out of the circle of groove, so that the fin is just contacted with the rotating shaft or forms elastic contact with pretightening force.
The sealing sheet groups 3 can be uniformly distributed along the circumferential direction at the same inclination angle of 30-70 degrees; the first sealing base body 1 and the second sealing base body 2 are both provided with a clamping groove for mounting the sealing sheet group 3 and controlling the mounting angle of the sealing sheet group 3. The sealing sheet group 3 can adopt special lofting, and is inclined in the circumferential direction and also has a certain angle of rotary inclination in the axial direction (the direction perpendicular to the circular plane).
The material of the sealing sheet group 3 can be cobalt-based alloy or nickel-based alloy.
The sealing principle is as follows: when the sealing assembly is arranged on equipment, a circle surrounded by the sealing sheet groups 3 which are closely arranged is exactly tangent to a rotated shaft, and the axially inclined sealing sheet groups can form axial blocking to incoming flow media because the incoming flow direction is axial, so that the sealing effect is achieved; when the sealed shaft works, no matter the shaft is expanded at high temperature or the shaft is vibrated at high speed to bring transient disturbance, the shaft and the sealing sheet group 3 are rubbed and collided, the wing-shaped structure of the sealing sheet group 3 and the inclination of the circumferential direction (preferably the inclination of the rotating direction of the shaft) enable the sealing sheet group 3 to have good elastic yielding effect, and when the shaft collides with the sealing sheet group 3, the sealing sheet group 3 yields instantly, so that the abrasion of the sealing sheet group and the shaft is reduced, and the damage is avoided.
Therefore, the dynamic sealing device forms sealing for incoming flow media and has the functions of automatic yielding and automatic compensation, so that abrasion is reduced, and the service life is prolonged.
Referring to fig. 3, in a specific application scenario of this embodiment, a whole sealing ring 8 (i.e., the above-mentioned rotary vane type high-temperature and high-pressure gas (liquid) elastic contact dynamic sealing device) is installed at a step in a casing 5 and is pressed by an end cover 7, a rotating shaft penetrates through the center of the sealing ring 8 and is tangent to a sealing surface of the sealing ring 8, when the rotary shaft operates, the rotating shaft 6 rotates at a high speed, a medium under pressure is introduced from the right side as shown in the figure (the medium input port is not limited thereto), and the sealing function of the sealing ring 8 prevents the.
The invention also provides a preparation method for preparing the rotary vane type high-temperature high-pressure gas (liquid) elastic contact dynamic sealing device, which comprises the following steps:
the sealing ring 8 is arranged at the step in the shell 5 and is pressed tightly by the end cover 7, and the rotating shaft penetrates through the center of the sealing ring 8 and is tangent to the sealing surface of the sealing ring 8;
the method specifically comprises the following steps: the sealing sheets 3 are arranged in the middle of the first sealing substrate 1 and the second sealing substrate 2 and are uniformly distributed along the circumferential direction at the same inclination angle of 30-70 degrees; the first sealing base body 1 and the second sealing base body 2 are respectively provided with a clamping groove for mounting the sealing sheet 3 and controlling the mounting angle of the sealing sheet 3, and the sealing ring 8 is formed by rotating and inclining axially or perpendicularly to the circular plane direction according to a set angle while inclining in the circumferential direction.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a rotary vane formula high temperature high pressure gas (liquid) body elastic contact dynamic seal device which characterized in that: the sealing structure comprises a first sealing base body (1), a second sealing base body (2) and a sealing sheet set (3), wherein the first sealing base body (1) and the second sealing base body (2) are both in annular structures and are coaxially and axially spliced, so that a circle of groove is formed on the inner side of the whole of the first sealing base body (1) and the second sealing base body (2); the sealing plate group (3) consists of a plurality of fins which are distributed in the circle of groove and are inclined along the circumferential direction and the axial direction of the rotating shaft; the fixed end of the fin is connected with the first sealing base body (1) and/or the second sealing base body (2), and the free end of the fin is flush with the top surface of the circle of groove or slightly extends out of the circle of groove, so that the fin is just contacted with the rotating shaft or forms elastic contact with pretightening force.
2. The rotary vane high-temperature high-pressure gas (liquid) elastic contact dynamic sealing device according to claim 1, characterized in that: the fins are uniformly distributed in the ring of grooves.
3. The rotary vane high-temperature high-pressure gas (liquid) elastic contact dynamic sealing device according to claim 1 or 2, characterized in that: the plurality of fins are inclined in the circumferential direction of the rotating shaft, specifically, in the rotating direction of the rotating shaft.
4. The rotary vane high-temperature high-pressure gas (liquid) elastic contact dynamic sealing device according to claim 3, characterized in that: the plurality of fins are uniformly distributed along the circumferential direction of the rotating shaft at the same inclination angle of 30-70 degrees.
5. The rotary vane high-temperature high-pressure gas (liquid) elastic contact dynamic sealing device according to claim 1 or 2, characterized in that: the plurality of fins are inclined in the axial direction, in particular, in the incoming flow direction of the medium.
6. The rotary vane high-temperature high-pressure gas (liquid) elastic contact dynamic sealing device according to claim 1, characterized in that: the sealing sheet group (3) consists of 1000-30000 fins.
7. The rotary vane high-temperature high-pressure gas (liquid) elastic contact dynamic sealing device according to claim 1, characterized in that: the first sealing base body (1) and the second sealing base body (2) are respectively provided with a clamping groove for installing the sealing sheet group (3) and controlling the installation angle of the sealing sheet group (3).
8. The rotary vane high-temperature high-pressure gas (liquid) elastic contact dynamic sealing device according to claim 1, characterized in that: the fin is made of cobalt-based alloy or nickel-based alloy.
9. An apparatus for applying the rotary vane high-temperature and high-pressure gas (liquid) elastic contact dynamic sealing device of claim 1, which comprises a casing, a rotating shaft and an end cover, and is characterized in that: the rotary-vane high-temperature high-pressure gas (liquid) elastic contact dynamic sealing device comprises a first sealing base body (1) and a second sealing base body (2) which respectively correspond to a low-pressure side and a high-pressure side in a machine shell; the rotary-vane high-temperature high-pressure gas (liquid) elastic contact dynamic sealing device is arranged at a step in the machine shell (5) and is compressed by an end cover (7), and the rotary shaft penetrates through the axis of the annular structure and is tangent to the whole inner side of the first sealing base body (1) and the second sealing base body (2) and in contact with the fins.
10. A method for preparing a rotary vane high-temperature high-pressure gas (liquid) elastic contact dynamic sealing device according to claims 1 to 8, comprising the following steps:
the sealing ring (8) is arranged at a step in the shell (5) and is tightly pressed by an end cover (7), and the rotating shaft penetrates through the center of the sealing ring (8) and is tangent to the sealing surface of the sealing ring (8);
the method specifically comprises the following steps: the sealing sheets (3) are arranged in the middle of the first sealing substrate (1) and the second sealing substrate (2) and are uniformly distributed along the circumferential direction at the same inclination angle of 30-70 degrees; the first sealing base body (1) and the second sealing base body (2) are respectively provided with a clamping groove for mounting the sealing sheet (3) and controlling the mounting angle of the sealing sheet (3), and the sealing ring (8) is formed by rotating and inclining in the axial direction or the direction perpendicular to the circular plane according to a set angle while inclining in the circumferential direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010221829.XA CN111306301A (en) | 2020-03-25 | 2020-03-25 | Rotary vane type high-temperature high-pressure gas (liquid) elastic contact dynamic sealing device and preparation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010221829.XA CN111306301A (en) | 2020-03-25 | 2020-03-25 | Rotary vane type high-temperature high-pressure gas (liquid) elastic contact dynamic sealing device and preparation method |
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| CN111306301A true CN111306301A (en) | 2020-06-19 |
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| CN202010221829.XA Pending CN111306301A (en) | 2020-03-25 | 2020-03-25 | Rotary vane type high-temperature high-pressure gas (liquid) elastic contact dynamic sealing device and preparation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112360983A (en) * | 2020-10-29 | 2021-02-12 | 西安丁杰精密机械制造有限责任公司 | Elastic contact type dynamic sealing structure for high-temperature and high-pressure gas or liquid |
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- 2020-03-25 CN CN202010221829.XA patent/CN111306301A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112360983A (en) * | 2020-10-29 | 2021-02-12 | 西安丁杰精密机械制造有限责任公司 | Elastic contact type dynamic sealing structure for high-temperature and high-pressure gas or liquid |
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