CN113090575B - Double-floating-ring sealing blowing isolation device and turbopump - Google Patents
Double-floating-ring sealing blowing isolation device and turbopump Download PDFInfo
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- CN113090575B CN113090575B CN202110518237.9A CN202110518237A CN113090575B CN 113090575 B CN113090575 B CN 113090575B CN 202110518237 A CN202110518237 A CN 202110518237A CN 113090575 B CN113090575 B CN 113090575B
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- floating ring
- blowing
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- double
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/16—Sealings between pressure and suction sides
- F04D29/165—Sealings between pressure and suction sides especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/007—Details, component parts, or accessories especially adapted for liquid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The invention discloses a double-floating-ring sealing blowing isolation device and a turbopump, which comprise a blowing interlayer mechanism and two floating ring sealing structures; the blowing interlayer mechanism is used for providing airflow flowing along the radial direction of the shaft sleeve; the two floating ring sealing structures are symmetrically arranged on two sides of the blowing interlayer mechanism, and a medium radial circulation channel is formed between the two sides of the blowing interlayer mechanism and the two floating ring sealing structures. The double-floating-ring rotary sealing structure shortens the installation space of the two traditional floating rings arranged along the shaft to the same axial position, effectively reduces the axial span of the rotor, increases the critical rotating speed of the rotor, effectively improves the dynamic stability of a rotor system, and improves the safety of products. The medium sealing device can be popularized and applied to medium sealing in combined engines of aviation, aerospace and adjacent space.
Description
Technical Field
The invention relates to a double-floating-ring sealing blowing-off isolating device capable of obviously shortening axial span aiming at two non-contact media, which can be applied to medium sealing in aviation, aerospace and adjacent space combined engines.
Background
The prior liquid rocket engine turbopump widely adopts the floating ring for sealing, and often adopts a mode of connecting two rings or multiple rings in series to form multilayer floating seal in order to reduce the leakage to a proper level.
Sometimes two working media exist in the same device in the turbopump of the liquid rocket engine, and due to the factors of engine performance and safety, the two media can affect the safe and stable operation of the engine once contacting, so that the two media which are not contacted need to be sealed and isolated. Aiming at two non-contact media, double floating ring seals arranged along a shaft are often adopted at the respective sides, the leakage amount of the media is effectively controlled, and protective gas is arranged in the middle for blowing and isolating, so that the contact of the two media is avoided.
The traditional double-floating-ring sealing blowing-off isolation device has the specific structure shown in fig. 1, and the sealing blowing-off isolation structure is arranged on a rotor 01 and comprises a shaft sleeve 02, a blowing-off component 03 and floating ring sealing structures 04 symmetrically arranged on two sides of the blowing-off component 03; the floating ring sealing structure on each side comprises a first-stage floating ring 05 and a second-stage floating ring 06 which are arranged along the axial direction of the rotor 01, and due to the serial arrangement of the first-stage floating ring 05 and the second-stage floating ring 06, the axial span of the traditional double-floating ring sealing blowing-off isolation device is increased, the dynamic performance of a rotor system is reduced, the critical rotating speed is reduced, and the safety and stability of the rotor system are reduced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome the defects of large axial span and insufficient rotor dynamics stability of the conventional double-floating-ring sealing blowing isolation device, the double-floating-ring sealing blowing isolation device which can obviously shorten the axial span aiming at two non-contact media is provided.
Meanwhile, the invention also provides a turbine pump using the blowing isolation device.
The technical solution of the invention is as follows:
the double-floating-ring sealing blowing isolation device comprises a blowing interlayer mechanism and two floating ring sealing structures; the blowing interlayer mechanism is used for providing airflow flowing along the radial direction of the shaft sleeve; the two floating ring sealing structures are symmetrically arranged on two sides of the blowing interlayer mechanism, and a medium radial circulation channel is formed between the two sides of the blowing interlayer mechanism and the two floating ring sealing structures;
the improvement is that: the floating ring sealing structure comprises a shaft sleeve, a small floating ring, a large floating ring, a small floating ring limiting seat and a large floating ring limiting seat;
the shaft sleeve comprises an inner cylinder body, an outer cylinder body and an isolation ring plate;
the inner cylinder, the outer cylinder and the isolation ring plate enclose an annular chamber;
the small floating ring limiting seat comprises a first concave part and a first radial extending part; the first sunken part is positioned in the annular cavity chamber, and the small floating ring is positioned in the first sunken part; the first concave part and the small floating ring are coaxially sleeved on the inner cylinder body, and an axial gap is kept between the first concave part and the inner cylinder body; a first flow guide channel for guiding the medium leaked from the small floating ring to the large floating ring is arranged between the first concave part and the annular chamber;
the large floating ring limiting seat comprises a second concave part and a second radial extending part;
the large floating ring is positioned in the second concave part, the large floating ring and the second concave part are both sleeved on the outer cylinder body, and an axial gap is kept between the second concave part and the outer cylinder body and is used for guiding the medium leaked from the large floating ring to a second flow guide channel of the medium radial flow channel;
the first radial extension part extends along the radial direction of the shaft sleeve and is fixedly connected with the second radial extension part.
Preferably, in order to further improve the sealing effect, the air outlet of the blowing pipe is provided with labyrinth seal teeth, so that a labyrinth seal is formed between the air outlet of the blowing pipe and the shaft sleeve.
Preferably, the labyrinth seal has a seal clearance of 0.45 to 0.75 mm.
Preferably, a sealing ring is arranged at the position where the first radial extension part is connected with the second radial extension part.
Preferably, the inner cylinder, the outer cylinder and the isolating ring plate are of an integrated structure.
Preferably, the gas provided by the blowing interlayer mechanism is helium.
The invention also provides a turbine pump, which comprises a static shell and a rotor; the double-floating-ring sealing blowing-off isolation device is arranged between the static shell and the rotor;
a blowing interlayer mechanism, a small floating ring limiting seat and a large floating ring limiting seat in the double-floating ring sealing blowing isolation device are fixedly connected with the static shell;
the shaft sleeve is sleeved on the rotor and is driven by the rotor to rotate.
Compared with the prior art, the invention has the following advantages:
1. the invention shortens the installation space of two floating rings which are arranged in series along the axial direction in the traditional double-floating-ring sealing blowing isolation device to the same axial position (namely, the two floating rings are arranged in parallel), effectively reduces the axial span of the rotor, increases the critical rotating speed of the rotor, effectively improves the dynamic stability of a rotor system and improves the safety of products.
2. In the invention, the discharge ports (namely, the second flow guide channels) of the media at two sides, which are communicated with the radial media flow channel, are arranged on the second concave part, and the distance between the discharge ports of the media at two sides is greatly increased compared with the distance between the discharge ports (A and B in figure 1) of the existing double-floating-ring sealing blowing isolation device, so that the possibility of contact between the two media is further reduced.
3. According to the invention, the blowing interlayer mechanism carries out reverse blowing on the medium in the medium radial circulation channel, and the labyrinth seal formed between the blowing interlayer mechanism and the inner cylinder is utilized, so that the possibility of contact is further reduced, and the safety and stability of the device are improved.
Drawings
FIG. 1 is a schematic structural diagram of a conventional double floating ring seal blow-off isolation device;
the reference numerals of fig. 1 are as follows:
01-rotor, 02-shaft sleeve, 03-blowing component 04-floating ring sealing structure, 05-first stage floating ring and 06-second stage floating ring.
Fig. 2 is a schematic structural diagram of the embodiment.
The reference numerals of fig. 2 are as follows:
1-rotor, 2-blowing interlayer mechanism, 3-floating ring sealing structure, 4-medium radial flow channel, 5-shaft sleeve, 6-small floating ring, 7-large floating ring, 8-small floating ring limiting seat, 9-large floating ring limiting seat, 10-inner cylinder, 11-outer cylinder, 12-isolating ring plate, 13-annular chamber, 14-first recess, 15-first radial extension, 16-first flow guide channel, 17-second recess, 18-second radial extension, 19-second flow guide channel and 20-labyrinth sealing tooth.
The arrows indicate the direction of the media flow.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood 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.
In the description of the present invention, it should be noted that the terms "first" and "second" 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 should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
This embodiment describes the structure in detail according to the specific implementation process of the double floating ring seal blowing isolation device in the turbo pump, as shown in fig. 1:
the turbo pump comprises a stationary casing (not shown in the figures) and a rotor 1; a double-floating-ring sealing blowing-off isolation device is arranged between the static shell and the rotor 1; the double-floating-ring sealing blowing isolation device comprises a blowing interlayer mechanism 2 and two floating ring sealing structures 3; the two floating ring sealing structures 3 are symmetrically arranged on two sides of the blowing interlayer mechanism 2, and a medium radial circulation channel 4 is formed between the two sides of the blowing interlayer mechanism 2 and the two floating ring sealing structures 3;
the following is a detailed description of a one-side floating ring seal structure: the floating ring sealing structure 3 comprises a shaft sleeve 5, a small floating ring 6, a large floating ring 7, a small floating ring limiting seat 8 and a large floating ring limiting seat 9;
the shaft sleeve is sleeved on the rotor 1, the shaft sleeve rotates along with the rotor 1 when in work, and the shaft sleeve 5 comprises an inner cylinder 10, an outer cylinder 11 and an isolation ring plate 12 (the inner cylinder 10, the outer cylinder 11 and the isolation ring plate 12 are of an integrated structure and are integrally formed, so that the purpose is to ensure the matching precision of all parts, and the shaft sleeve 5 can be formed by splicing the inner cylinder 10, the outer cylinder 11 and the isolation ring plate 12 in a welding mode; the inner cylinder 10, the outer cylinder 11 and the isolating ring plate 12 enclose an annular chamber 13;
the small floating ring limiting seat 8 comprises a first concave part 14 and a first radial extension part 15; the first concave part 13 is positioned in the annular chamber 13, the small floating ring 6 is positioned in the first concave part 14, and under the action of medium pressure, the end surface of one side of the first concave part 14 is attached to the limit seat of the small floating ring 6, so that the axial movement of the small floating ring 6 is limited; the first concave part 14 and the small floating ring 6 are coaxially sleeved on the inner cylinder 10, an axial gap (namely, the position C in the figure 2) is kept between the first concave part 14 and the inner cylinder 10, and a first minimum gap (namely, the position D in the figure 2) is formed between the small floating ring and the inner cylinder during work; between the first recess 14 and the annular chamber 13 there is a first flow channel 16 for guiding medium leaking at the small floating ring 6 to the large floating ring, and thus to the large floating ring; the axial clearance at the position C is used for guiding the medium leaked from the small floating ring 6 through the first minimum clearance to the large floating ring 7 through the first flow guide channel 16, and the small floating ring limiting seat 8 is prevented from contacting with the inner cylinder 10, so that the small floating ring limiting seat 8 is kept in a static state all the time;
the large floating ring limit seat 9 comprises a second concave part 17 and a second radial extension part 18;
the large floating ring 7 is positioned in the second concave part 17, under the action of medium pressure, one side end face of the second concave part 17 is attached to the large floating ring limiting seat 9, so that the axial movement of the large floating ring 7 is limited, the large floating ring 7 and the large floating ring limiting seat are both sleeved on the outer cylinder 11, a second minimum gap (namely, the position E in the figure 2) is formed between the large floating ring 7 and the outer cylinder 11 during working, an axial gap (namely, the position F in the figure 2) is kept between the second concave part 17 and the outer cylinder 11, and the axial gap at the position F is not only used for guiding the medium leaked from the second minimum gap to the second flow guide channel 19 of the medium radial flow channel 4, but also avoids the large floating ring limiting seat 9 from contacting the outer cylinder 11, so that the large floating ring limiting seat 9 is always kept in a static state;
the first radial extension part 15 extends along the radial direction of the shaft sleeve and is fixedly connected with the second radial extension part 18, namely, the small floating ring limiting seat 8 is fixedly connected with the large floating ring limiting seat 9, and the fixedly connected small floating ring limiting seat 8 and the large floating ring limiting seat 9 are fixedly connected to the static shell as a whole.
Blow off sandwich structure 2 and link firmly with static casing for the stationary part, blow off the medium of revealing that gets into medium radial circulation passageway 4 through providing nitrogen gas, kept apart the contact of both sides medium.
In addition, in order to further ensure the isolation sealing effect, the air outlet of the blowing sandwich mechanism 2 is provided with labyrinth seal teeth 20, so that a labyrinth seal is formed between the air outlet of the blowing sandwich mechanism and the shaft sleeve, the sealing gap of the labyrinth seal is preferably 0.45-0.75mm, and meanwhile, a sealing ring for preventing medium leakage is arranged at the position where the first radial extension part 14 is connected with the second radial extension part 18.
Based on the above description of the structure of the device, the principle of the isolation seal of the device will now be explained in detail:
1. one-stage floating seal
The media moves axially along the rotor, mostly isolated at the primary floating seal formed between the small floating ring and the inner cylinder, but there may be a small amount of media leaking to the large floating ring through the first minimal gap (i.e., position D in fig. 2), the axial gap (i.e., position C in fig. 2), and the first flow guide channel.
2. Two-stage floating seal
The media leaking to the large floating ring is mostly isolated at the secondary floating seal structure formed between the large floating ring and the outer cylinder, but still very little media may leak to the media radial flow channel through the second very small gap (i.e. the position in fig. 2), the second flow guide channel.
3. Blow isolation
The medium leaked into the medium radial circulation channel flows from top to bottom along the radial direction of the rotor, and the medium is blown reversely by the nitrogen flow provided by the blowing interlayer mechanism.
4. Labyrinth seal
In order to further ensure the sealing and isolating effect, a labyrinth seal is formed between the air outlet of the blowing sandwich mechanism and the shaft sleeve to serve as a last barrier to seal and isolate media which are not blown by air.
Therefore, the device disclosed by the invention adopts two-stage floating seal, one gas blowing and one labyrinth seal, so that the sealing and the isolation of media on two sides are effectively realized, the axial span of the rotor is effectively reduced, the critical rotating speed of the rotor is increased, the dynamic stability of a rotor system is effectively improved, and the safety of a product is improved.
Claims (7)
1. A double-floating-ring sealing blowing isolation device comprises a blowing interlayer mechanism and two floating ring sealing structures; the blowing interlayer mechanism is used for providing airflow flowing along the radial direction of the shaft sleeve; the two floating ring sealing structures are symmetrically arranged on two sides of the blowing interlayer mechanism, and a medium radial circulation channel is formed between the two sides of the blowing interlayer mechanism and the two floating ring sealing structures;
the method is characterized in that: the floating ring sealing structure comprises a shaft sleeve, a small floating ring, a large floating ring, a small floating ring limiting seat and a large floating ring limiting seat;
the shaft sleeve comprises an inner cylinder, an outer cylinder and an isolating ring plate;
the inner cylinder, the outer cylinder and the isolation ring plate form an annular chamber;
the small floating ring limiting seat comprises a first concave part and a first radial extending part; the first sunken part is positioned in the annular cavity chamber, and the small floating ring is positioned in the first sunken part; the first concave part and the small floating ring are coaxially sleeved on the inner cylinder body, and an axial gap is kept between the first concave part and the inner cylinder body; a first flow guide channel for guiding the medium leaked from the small floating ring to the large floating ring is arranged between the first concave part and the annular chamber;
the large floating ring limiting seat comprises a second concave part and a second radial extending part;
the large floating ring is positioned in the second concave part, the large floating ring and the second concave part are both sleeved on the outer cylinder body, and an axial gap is kept between the second concave part and the outer cylinder body and is used for guiding the medium leaked from the large floating ring to the medium radial circulation channel;
the first radial extension part extends along the radial direction of the shaft sleeve and is fixedly connected with the second radial extension part.
2. The double floating ring seal blow-off isolation device of claim 1, wherein: and labyrinth seal teeth are arranged at the air outlet of the blowing interlayer mechanism, so that labyrinth seal is formed between the air outlet of the blowing interlayer mechanism and the shaft sleeve.
3. The double floating ring seal blow off isolator of claim 2, wherein: the sealing clearance of the labyrinth seal is 0.45-0.75 mm.
4. The dual floating ring seal blow off isolator of claim 1, 2 or 3, wherein: and a sealing ring is arranged at the position where the first radial extension part is connected with the second radial extension part.
5. The double floating ring seal blow off isolator of claim 4, wherein: the inner cylinder body, the outer cylinder body and the isolation ring plate are of an integrated structure.
6. The double floating ring seal blow off isolator of claim 1, wherein: and the gas provided by the blowing interlayer mechanism is helium.
7. A turbo pump comprising a stationary housing and a rotor; the method is characterized in that: the double floating ring seal blow-off isolation device as claimed in any one of claims 1 to 6 is arranged between the static shell and the rotor;
a blowing interlayer mechanism, a small floating ring limiting seat and a large floating ring limiting seat in the double-floating ring sealing blowing isolation device are fixedly connected with the static shell;
the shaft sleeve is sleeved on the rotor and is driven by the rotor to rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110518237.9A CN113090575B (en) | 2021-05-12 | 2021-05-12 | Double-floating-ring sealing blowing isolation device and turbopump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110518237.9A CN113090575B (en) | 2021-05-12 | 2021-05-12 | Double-floating-ring sealing blowing isolation device and turbopump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113090575A CN113090575A (en) | 2021-07-09 |
| CN113090575B true CN113090575B (en) | 2022-07-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110518237.9A Active CN113090575B (en) | 2021-05-12 | 2021-05-12 | Double-floating-ring sealing blowing isolation device and turbopump |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4744721A (en) * | 1985-11-08 | 1988-05-17 | Eg & G Sealol | Turbopump sealing device |
| JP2001271939A (en) * | 2000-03-24 | 2001-10-05 | Mitsubishi Heavy Ind Ltd | Self-excited oscillation preventing mechanism for multistage floating ring seal |
| CN1354328A (en) * | 2000-11-16 | 2002-06-19 | 王玉明 | Combined floating ring sealing device |
| EP1420196A2 (en) * | 2002-11-14 | 2004-05-19 | M.E.F. Financing Establishment | Barrier pressure seal with pump function |
| CN110513323A (en) * | 2019-09-17 | 2019-11-29 | 四川日机密封件股份有限公司 | A kind of contactless isolating seal structure for turbine pump |
| CN111140509A (en) * | 2019-11-27 | 2020-05-12 | 西安航天动力研究所 | Coaxial turbine pump structure of liquid oxygen kerosene engine |
| CN211288754U (en) * | 2019-12-26 | 2020-08-18 | 中国航发长江动力有限公司 | Floating ring sealing device |
-
2021
- 2021-05-12 CN CN202110518237.9A patent/CN113090575B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4744721A (en) * | 1985-11-08 | 1988-05-17 | Eg & G Sealol | Turbopump sealing device |
| JP2001271939A (en) * | 2000-03-24 | 2001-10-05 | Mitsubishi Heavy Ind Ltd | Self-excited oscillation preventing mechanism for multistage floating ring seal |
| CN1354328A (en) * | 2000-11-16 | 2002-06-19 | 王玉明 | Combined floating ring sealing device |
| EP1420196A2 (en) * | 2002-11-14 | 2004-05-19 | M.E.F. Financing Establishment | Barrier pressure seal with pump function |
| CN110513323A (en) * | 2019-09-17 | 2019-11-29 | 四川日机密封件股份有限公司 | A kind of contactless isolating seal structure for turbine pump |
| CN111140509A (en) * | 2019-11-27 | 2020-05-12 | 西安航天动力研究所 | Coaxial turbine pump structure of liquid oxygen kerosene engine |
| CN211288754U (en) * | 2019-12-26 | 2020-08-18 | 中国航发长江动力有限公司 | Floating ring sealing device |
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