CN217712691U - Dry steam sealing structure capable of being replaced quickly - Google Patents
Dry steam sealing structure capable of being replaced quickly Download PDFInfo
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- CN217712691U CN217712691U CN202221962629.0U CN202221962629U CN217712691U CN 217712691 U CN217712691 U CN 217712691U CN 202221962629 U CN202221962629 U CN 202221962629U CN 217712691 U CN217712691 U CN 217712691U
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Abstract
The utility model relates to a dry gas sealing structure capable of being replaced rapidly, which can be replaced rapidly with the traditional tooth-type steam sealing structure, and after the dry gas sealing is damaged, the unit can be replaced with the upper tooth-type sealing structure again by replacing part of sleeves, so that the unit can continue to operate; the dry steam sealing structure comprises a static component and a moving component, wherein the static component is installed in a cylinder body, the moving component is installed on a rotor, the moving component and the static component are sealed in a moving mode through a moving ring and a static ring, and a force for separating the moving ring from the static ring is formed between sealing end faces between the moving ring and the static ring through sealing gas introduced from the outside under pressure, so that gas film sealing between the sealing end faces is realized, a gas film belt is formed between the moving ring and the static ring by the gas film, and the atmosphere inside and outside a unit is separated.
Description
Technical Field
The utility model relates to a marine steam turbine vapor seal system, but especially a quick replacement's dry vapor seal structure.
Background
The steam turbine for ships is arranged in a closed cabin bottom cabin, and the leakage of steam in the steam turbine can cause the working conditions of cabin personnel in the cabin to be very severe. And the working medium can not be supplemented in time in the process of ship navigation by the marine steam turbine, and the steam loss caused by the operation of the steam turbine can not be supplemented in time. The gland sealing system employed therefore needs to ensure that the turbine interior is completely sealed from the cabin environment.
The traditional marine turbine usually adopts a tooth type sealing structure. The device has the characteristics of simple structure, wide application and mature production process. But the structure also has the characteristics of reduced sealing performance after long-term use and serious rotor abrasion.
A conventional gland seal configuration is shown in fig. 1. The traditional steam seal structure consists of an outer steam seal and a steam seal ring. The outer gland seal and the gland seal ring are both provided with gland seal tooth structures. The steam seal teeth have a high-low tooth and flat tooth structure, and the clearance between the steam seal teeth and the shaft is usually 0.2-0.4 mm. When the shaft moves, friction occurs between the steam seal teeth and the shaft, and the steam seal teeth are abraded. Because the spring plate that sets up behind the gland casing, the gland casing body can not produce mechanical damage, but after long-time the use, gland tooth top is worn and torn, and the gland effect descends.
In the traditional steam seal structure, the steam seal balance chamber is connected with the steam seal pipeline, and the steam seal pipeline needs to continuously supply steam to the steam seal balance chamber when the steam seal is used. The access of steam at this location will also reduce the overall efficiency of the unit.
Disclosure of Invention
The utility model aims to provide a can carry out quick replacement's dry gas seal structure, this dry gas seal structure can be dismantled through opening the jar, can quick replacement for the tooth-like seal structure.
In order to achieve the above purpose, the technical scheme of the utility model is that: a dry gas sealing structure capable of being replaced quickly can be replaced quickly with a traditional tooth type steam sealing structure, and after the dry gas sealing structure is damaged, a unit can be replaced with the tooth type sealing structure again in a manner of replacing part of part sleeves, so that the unit can continuously operate; the dry steam sealing structure comprises a static component and a moving component, wherein the static component is installed in a cylinder body, the moving component is installed on a rotor, the moving component and the static component are sealed in a moving mode through a moving ring and a static ring, and a force for separating the moving ring from the static ring is formed between sealing end faces between the moving ring and the static ring through sealing gas introduced from the outside under pressure, so that gas film sealing between the sealing end faces is realized, a gas film belt is formed between the moving ring and the static ring by the gas film, and the atmosphere inside and outside a unit is separated.
Further, the static part comprises a static ring supporting block, a static ring limiting block, a limiting block and a static ring, wherein the static ring supporting block and the static ring limiting block are arranged in the cylinder body and axially limit the static ring supporting block and the static ring limiting block by the limiting block; the static ring is arranged in the static ring supporting block.
Further, the motion part includes rotating ring, rotating ring stopper, the sealed piece of rotating ring, rotating ring supporting block, transmission round pin, rotor, pass through rotating ring supporting block installation rotating ring on the spindle nose of the quiet ring supporting block, quiet ring and the quiet ring stopper that correspond on the cylinder body on the rotor to with the spacing rotating ring of rotating ring stopper axial on fixing the rotating ring supporting block, be equipped with the sealed piece of rotating ring on the rotor of rotating ring stopper front end, be equipped with the transmission round pin between rotating ring supporting block and the rotor, the rotor passes through the transmission round pin and drives rotating ring supporting block and rotating ring rotation.
Further, a sealing ring is arranged between the dynamic ring sealing block and the static ring limiting block, and the sealing ring is fixedly connected to the static ring limiting block.
Further, the tooth type sealing structure comprises a cylinder body, a sealing tooth supporting block, a limiting block, a fixing bolt, a sealing tooth ring, a movable sealing ring and a rotor, wherein the sealing tooth supporting block is used for replacing a static ring supporting block, a static ring limiting block and a static ring in the dry gas sealing structure; a sealing toothed ring fixed on the sealing toothed support block is arranged between the sealing toothed support block and the dynamic sealing ring and used for replacing the sealing ring in the dry gas sealing structure.
The beneficial effects of the utility model are that:
the utility model discloses a main basic theory that dry vapor seal structure adopted is static pressure gas lubrication bearing theory, presses the pressurized seal gas through the external world introduction, forms reliable and stable just the detached power of sound ring between seal end face to realize the air film seal between the terminal surface. The air film forms an air film belt between the dynamic ring and the static ring, and the inside of the unit and the outside atmosphere are isolated.
The main basic theory adopted by the tooth type sealing structure is a throttling theory, and the sealing teeth enable steam in the unit to pass through a plurality of small sealing cavities in the process of spreading outwards, so that the leakage amount is reduced, and the effect of steam sealing is further achieved.
After the dry gas seal forms a gas film, compared with the tooth type seal, the new steam quantity required is less, and the new steam quantity leaking into the unit and the steam extraction system is reduced. The reduction of the new steam improves the overall efficiency of the unit on the one hand and reduces the steam suction amount of the air extractor on the other hand. The suction capacity and heat exchange area required by the air extractor are also reduced.
However, in the dry gas seal on the other hand, because the movable ring and the fixed ring are tightly attached together, if the problems of unstable steam inlet, rotor movement and the like occur at the steam inlet position, the movable ring and the fixed ring are easily blocked, the fixed ring is cracked and the like. The method brings great challenges to the safe and stable operation of the unit.
The tooth type seal is a traditional structure, a spring piece is usually adopted to support the seal ring, the problem of rotor movement occurs in time, and the safe and stable use of the seal structure can be kept. And even if the inlet steam has the problems of instability and the like, the problem of air leakage increase can be caused, and the stable operation of the unit can not be influenced.
Consequently combine the above-mentioned two kinds of sealed advantages and disadvantages, the utility model provides an above-mentioned dry vapour seal structure that can carry out quick replacement with traditional tooth-like vapor seal structure. After the dry gas seal is damaged by accident, the upper tooth type seal can be replaced again by the unit in a mode of replacing part of the sleeve, so that the unit can continuously operate.
Drawings
FIG. 1 is a schematic view of a conventional tooth structure;
fig. 2 is a schematic view of the dry gas sealing structure of the present invention;
FIG. 3 is a block diagram of a dry gas seal system;
FIG. 4 is a schematic view of the dry gas seal internal flow direction;
FIG. 5 is a schematic view of a tooth seal arrangement;
FIG. 6 is a diagram of a tooth seal system;
fig. 7 is a schematic view of the internal flow direction of the tooth seal.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
As shown in fig. 2, the utility model discloses a can carry out quick replacement's dry vapour seal structure, including cylinder body 1, quiet ring rest pad 2, quiet ring stopper 3, stopper 4, quiet ring 5, rotating ring 6, rotating ring stopper 7, sealing ring 8, rotating ring seal block 9, locking bolt 10, rotating ring rest pad 11, driving pin 12, rotor 13. A stationary ring supporting block 2 and a stationary ring limiting block 3 are arranged in the cylinder body 1, and the stationary ring supporting block 2 and the stationary ring limiting block 3 are axially limited by a limiting block 4; the static ring bearing block 2 is internally provided with a static ring 5. Correspond quiet ring supporting piece 2 on the cylinder body 1 on the rotor 13, go up through rotating ring supporting piece 11 installation rotating ring 6 on the spindle nose of quiet ring 5 and quiet ring stopper 3, and with the 7 spacing rotating rings 6 of rotating ring stopper axial that fix on rotating ring supporting piece 11, be equipped with the sealed piece 9 of rotating ring on the rotor 13 of 7 front ends of rotating ring stopper, be equipped with sealing ring 8 between the sealed piece 9 of rotating ring and the quiet ring stopper 3, and 8 fixed connection of sealing ring are at quiet ring stopper 3, be equipped with drive pin 12 between rotating ring supporting piece 11 and the rotor 13, rotor 13 drives rotating ring supporting piece 11 and rotating ring 6 through drive pin 12 and rotates.
Among the above components, the rotor 13, the movable ring 6, the movable ring support block 11, the movable ring limit block 7, the lock nut 10, the drive pin 12 and the fixing bolt are moving components and keep rotating along with the rotation of the rotor 13.
The cylinder body 1, the stationary ring 5, the limiting block 4, the stationary ring supporting block 11, the stationary ring limiting block 11 and the sealing ring 8 are stationary components.
The dry gas sealing system diagram and the internal flow situation are shown in fig. 3 and 4. It can be seen from the figure that the live steam pipe is continuously supplying live steam into the dry gas seal structure. The new steam is divided into two parts after passing through the gap between the dynamic ring and the static ring and respectively enters the interior of the steam turbine and a steam extraction chamber. Enters the steam extraction chamber, is mixed with air leaked from the outside and is extracted by the air extractor.
This dry gas seal structure can be dismantled through opening the jar, can replace for the tooth-like seal structure fast. An alternative tooth construction is shown in fig. 5. The structure comprises a cylinder body 1, a sealing tooth supporting block 22, a limiting block 3, a fixing bolt 24, a sealing tooth ring 25, a dynamic sealing ring 26 and a rotor 13. The static ring supporting block 2, the static ring limiting block 3 and the static ring 5 in the dry gas sealing structure are replaced by the sealing tooth supporting block 22, the limiting block 3 and the fixing bolt 24 are used for axially limiting the sealing tooth supporting block 22, the dynamic ring 6, the dynamic ring limiting block 7 and the dynamic ring sealing block 9 in the dry gas sealing structure are replaced by the dynamic sealing ring 26, and the rotor 13 drives the dynamic sealing ring 26 to rotate through the transmission pin 12. A sealing gear ring 25 fixed on the sealing gear support block 22 is arranged between the sealing gear support block 22 and the dynamic sealing ring 26 and is used for replacing the sealing ring 8 in the dry gas sealing structure. The reloaded tooth seal arrangement is shown in figure 5.
Among the above components, the rotor 13 and the dynamic seal ring 26 are moving components and keep rotating with the rotation of the rotor 13. The cylinder body, the seal tooth supporting block 22, the limiting block 3, the fixing bolt 24 and the seal tooth ring 25 are static parts.
The tooth seal system diagram and internal flow conditions are shown in fig. 6 and 7. It can be observed from the figure that fresh steam enters the tooth seal through the balancing chamber. And after entering the tooth type steam seal, new steam respectively enters the interior of the unit and the steam extraction chamber through the sealing teeth on the two sides of the sealing ring. Enters the steam extraction chamber, is mixed with air leaked from the outside and is extracted by the air extractor.
The dry gas seal structure and the tooth seal structure have the capability of interchanging.
Comparing and observing the figures 2 and 5, the dry gas seal structure and the tooth seal structure such as the cylinder, the rotor, the limiting block and the like are basically the same, and the seal structure exchange can be completed only by replacing the replaceable structures such as the movable ring, the static ring, the movable ring supporting block and the like with the structures such as the seal tooth ring, the movable ring seal ring and the like. The two sealing structures thus have an interchangeable condition in their construction.
Comparing fig. 3 and fig. 6, it can be observed that the tooth seal and the dry gas seal are basically consistent in system structure, and the pipeline communicating with the outside is a pipeline for steam entering and a pipeline leading to the air extractor. Therefore, the two sealing structures have the condition of interchanging on the system. The exchange of the steam seal structure can be completed without adjusting the system pipeline.
After the dry gas seal is damaged, the upper half cylinder body of the steam turbine is opened, the static ring supporting block, the static ring limiting block, the static ring, the movable ring limiting block, the sealing ring, the movable ring sealing block, the locking nut, the movable ring supporting block and the transmission pin structure are removed, and the dry gas seal can be replaced to the tooth-type sealing structure by replacing the sealing tooth supporting block, the fixing bolt, the sealing tooth ring and the movable sealing ring structure.
Claims (5)
1. The utility model provides a can carry out quick replacement's dry gas seal structure can carry out quick replacement with traditional tooth-like vapor seal structure to the dry gas is sealed to take place to destroy the back, can make the unit change the outfit again through the form of changing partial sleeve and go up tooth formula seal structure, makes the unit can continue the operation, its characterized in that: the dry steam sealing structure comprises a static component and a moving component, wherein the static component is installed in a cylinder body, the moving component is installed on a rotor, the moving component and the static component are sealed in a moving mode through a moving ring and a static ring, and a force for separating the moving ring from the static ring is formed between sealing end faces between the moving ring and the static ring through sealing gas introduced from the outside under pressure, so that gas film sealing between the sealing end faces is realized, a gas film belt is formed between the moving ring and the static ring by the gas film, and the atmosphere inside and outside a unit is separated.
2. The dry vapor seal structure capable of rapid replacement according to claim 1, characterized in that: the static part comprises a static ring supporting block, a static ring limiting block, a limiting block and a static ring, wherein the static ring supporting block and the static ring limiting block are arranged in the cylinder body and axially limit the static ring supporting block and the static ring limiting block by the limiting block; the static ring is arranged in the static ring supporting block.
3. The dry vapor seal structure capable of rapid replacement according to claim 1, characterized in that: the movable part includes rotating ring, rotating ring stopper, the sealed piece of rotating ring, rotating ring supporting block, driving pin, rotor, correspond on the rotor and pass through rotating ring supporting block installation rotating ring on the spindle nose of quiet ring supporting block, quiet ring and quiet ring stopper on the cylinder body to with fixing the spacing rotating ring of rotating ring stopper axial on the rotating ring supporting block, be equipped with the sealed piece of rotating ring on the rotor of rotating ring stopper front end, be equipped with the driving pin between rotating ring supporting block and the rotor, the rotor passes through the driving pin and drives rotating ring supporting block and rotating ring rotation.
4. The dry vapor seal structure capable of rapid replacement according to claim 3, characterized in that: a sealing ring is arranged between the movable ring sealing block and the static ring limiting block, and the sealing ring is fixedly connected to the static ring limiting block.
5. The dry vapor seal structure capable of rapid replacement according to claim 4, wherein: the tooth type sealing structure comprises a cylinder body, a sealing tooth supporting block, a limiting block, a fixing bolt, a sealing tooth ring, a movable sealing ring and a rotor, wherein the sealing tooth supporting block is used for replacing a static ring supporting block, a static ring limiting block and a static ring in the dry gas sealing structure; a sealing toothed ring fixed on the sealing toothed support block is arranged between the sealing toothed support block and the dynamic sealing ring and used for replacing the sealing ring in the dry gas sealing structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221962629.0U CN217712691U (en) | 2022-07-27 | 2022-07-27 | Dry steam sealing structure capable of being replaced quickly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221962629.0U CN217712691U (en) | 2022-07-27 | 2022-07-27 | Dry steam sealing structure capable of being replaced quickly |
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| CN217712691U true CN217712691U (en) | 2022-11-01 |
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| CN202221962629.0U Active CN217712691U (en) | 2022-07-27 | 2022-07-27 | Dry steam sealing structure capable of being replaced quickly |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115142908A (en) * | 2022-07-27 | 2022-10-04 | 中国船舶重工集团公司第七0四研究所 | Dry steam sealing structure capable of being replaced quickly |
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2022
- 2022-07-27 CN CN202221962629.0U patent/CN217712691U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115142908A (en) * | 2022-07-27 | 2022-10-04 | 中国船舶重工集团公司第七0四研究所 | Dry steam sealing structure capable of being replaced quickly |
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