CN113915353A - Hot-blast shaft seal structure of adjusting of power plant boiler coal pulverizer - Google Patents
Hot-blast shaft seal structure of adjusting of power plant boiler coal pulverizer Download PDFInfo
- Publication number
- CN113915353A CN113915353A CN202111217232.9A CN202111217232A CN113915353A CN 113915353 A CN113915353 A CN 113915353A CN 202111217232 A CN202111217232 A CN 202111217232A CN 113915353 A CN113915353 A CN 113915353A
- Authority
- CN
- China
- Prior art keywords
- hot air
- shaft
- door plate
- adjusting door
- hot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/226—Shaping or arrangements of the sealing
- F16K1/2268—Sealing means for the axis of rotation
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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
- F16J15/44—Free-space packings
- F16J15/447—Labyrinth packings
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K41/00—Spindle sealings
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
- F16K41/04—Spindle sealings with stuffing-box ; Sealing rings with at least one ring of rubber or like material between spindle and housing
- F16K41/043—Spindle sealings with stuffing-box ; Sealing rings with at least one ring of rubber or like material between spindle and housing for spindles which only rotate, i.e. non-rising spindles
- F16K41/046—Spindle sealings with stuffing-box ; Sealing rings with at least one ring of rubber or like material between spindle and housing for spindles which only rotate, i.e. non-rising spindles for rotating valves
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K49/00—Means in or on valves for heating or cooling
Abstract
The invention discloses a hot air adjusting door shaft seal structure of a coal mill of a power plant boiler, which comprises a hot air adjusting door plate shaft, wherein the hot air adjusting door plate shaft is provided with an adjusting door shaft seal structure, a second labyrinth seal disc is fixedly arranged outside the joint of the hot air adjusting door plate shaft and a shell, the second labyrinth seal disc is fixed on the hot air adjusting door plate shaft, the hot air adjusting door plate shaft is fixedly sleeved with a first labyrinth seal disc, the first labyrinth seal disc is provided with a second sectional press cover and a first sectional press cover, a seal cavity is formed between the first sectional press cover and the hot air adjusting door plate shaft, and the seal cavity is accessed to an instrument for air cooling; the sealing structure of the invention finally eliminates the defects of shaft seal leakage and high temperature of the hot air regulating gate, greatly prolongs the service life of the rubber sealing ring, ensures that the hot air regulating gate can be effectively adjusted in time when other conditions such as coal feeding quantity, air pressure and the like of the coal mill change, and ensures the safe and stable operation of the unit.
Description
Technical Field
The invention belongs to the field of coal-fired power plant boilers, and particularly relates to a hot air adjusting door shaft seal structure of a coal mill of a power plant boiler.
Background
The hot air adjusting door shaft seal structure of the boiler coal mill in the existing power plant has multiple shaft seal leakage during operation, and an internal rubber sealing ring is easy to damage, the original shaft seal structure is conical, as shown in fig. 1, the original shaft seal is installed on a door plate shaft, high-temperature hot air in a hot air channel enters the shaft seal through a gap between the door plate shaft and a shell, the rubber sealing ring is burnt out and deformed, the shaft seal leaks air and powder, the adjustment of the operation condition of the coal mill is influenced, and the production environment is also polluted; and the external temperature of the shaft seal during the operation is very high, which is close to the hot air temperature of about 200 and 270 ℃, and the scalding hidden danger also exists for the passing personnel.
Therefore, we propose a hot air adjusting door shaft seal structure of a boiler coal mill in a power plant.
Disclosure of Invention
The invention aims to provide a hot air adjusting door shaft seal structure of a boiler coal mill in a power plant, which finally eliminates the defects of leakage and high temperature of the hot air adjusting door shaft seal, so that the coal mill can adjust the opening of the hot air adjusting door at any time, further adjust the operating condition and ensure the safe and stable operation of a unit.
The technical scheme includes that the hot air adjusting door shaft seal structure of the coal mill of the power plant boiler comprises a hot air adjusting door plate shaft, the hot air adjusting door plate shaft is provided with an adjusting door shaft seal structure, a second labyrinth seal disc is fixedly installed on the outer portion of the joint of the hot air adjusting door plate shaft and a shell, the second labyrinth seal disc is fixed on the hot air adjusting door plate shaft, a first labyrinth seal disc is fixedly sleeved on the hot air adjusting door plate shaft, a second sectional gland and a first sectional gland are assembled on the first labyrinth seal disc, a seal cavity is formed between the first sectional gland and the hot air adjusting door plate shaft, the seal cavity is connected into an instrument for air cooling, and the second sectional gland and the hot air adjusting door plate shaft are sealed through rubber seal rings.
Preferably, the first labyrinth seal disc is welded or fixed on the hot blast air adjusting door plate shaft by using a screw, and can rotate along with the hot blast air adjusting door plate shaft.
Preferably, the second sectional gland and the hot air adjusting door plate shaft are sealed by a rubber sealing ring.
Preferably, the sealed cavity access instrument is cooled by an air interface.
Preferably, a sealed cavity is formed between the first sectional gland and the hot blast shutter shaft.
The invention has the advantages that:
the hot air adjusting door shaft seal effectively reduces the times of burning out rubber seal when hot air enters the shaft seal, further reduces the times of air and powder leakage at the shaft seal, and reduces the pollution to the production environment; the accessed instrument gas effectively reduces the external temperature of the shaft seal, the labyrinth sealing disc greatly reduces the air quantity of hot air entering the shaft seal, the external temperature is close to the environmental temperature after modification, and the scald of the passing personnel is prevented; meanwhile, the replacement and repair of the shaft seal due to damage are reduced, the cost is saved, the workload is reduced, and the overhauling, the assembling and the disassembling are convenient. Through the reformation and processing of the hot air adjusting valve shaft seal of the 5 coal mills, the defects of frequent leakage and high temperature of the hot air adjusting valve shaft seal of the coal mill are successfully overcome, the leakage condition is not generated at present, and the safe and stable operation of a unit is ensured.
Drawings
FIG. 1 is a schematic view of a prior hot air adjusting door and a shaft seal structure;
FIG. 2 is a schematic view of the hot air adjusting door and shaft seal structure of the present invention.
The reference numbers illustrate: the device comprises a first section gland-1, a first labyrinth seal disc-2, a rubber seal ring-3, a hot air damper door plate shaft-4, a shell-5, an instrument air inlet-6, a second section gland-7 and a second labyrinth seal disc-8.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a hot air adjusting door shaft seal structure of a power plant boiler coal mill, which comprises a hot air adjusting door plate shaft 4 and is characterized in that an adjusting door shaft seal structure is arranged on the hot air adjusting door plate shaft 4, a second labyrinth seal disc 8 is fixedly arranged outside the joint of the hot air adjusting door plate shaft 4 and a shell 5, the second labyrinth seal disc 8 is fixed on the hot air adjusting door plate shaft 4, a first labyrinth seal disc 2 is fixedly sleeved on the hot air adjusting door plate shaft 4, a second subsection gland 7 and a first subsection gland 1 are arranged on the first labyrinth seal disc 2, a seal cavity is formed between the first subsection gland 1 and the hot air adjusting door plate shaft 4, the seal cavity is connected into an instrument air interface 6 for cooling, and the second subsection gland 7 and the hot air adjusting door plate shaft 4 are sealed by a rubber seal ring 3;
in this embodiment, it should be added that the first labyrinth seal 2 is welded or fixed to the hot blast damper shaft 4 by screws, and can rotate together with the hot blast damper shaft 4;
the hot air adjusting shaft seal effectively reduces the times of burning out rubber seal by hot air entering the shaft seal, further reduces the times of air and powder leakage at the shaft seal and reduces the pollution to the production environment; the accessed instrument gas effectively reduces the external temperature of the shaft seal, the labyrinth sealing disc greatly reduces the air quantity of hot air entering the shaft seal, the external temperature is close to the environmental temperature after modification, and the scald of the passing personnel is prevented; meanwhile, the replacement and repair of the shaft seal due to damage are reduced, the cost is saved, the workload is reduced, and the maintenance, the assembly and the disassembly are convenient; through the reformation and processing of the hot air adjusting valve shaft seal of the 5 coal mills, the defects of frequent leakage and high temperature of the hot air adjusting valve shaft seal of the coal mill are successfully overcome, the leakage condition is not generated at present, and the safe and stable operation of a unit is ensured.
The specific implementation mode is as follows: the hot air adjusting door plate shaft 4 extends out of the outer part of the adjusting door shell 5 and is sealed by an adjusting door shaft seal structure, a first labyrinth seal disc 2 is firstly installed outside the joint of the hot air adjusting door plate shaft 4 and the shell 5 and is fixed on the hot air adjusting door plate shaft 4 and can rotate along with the hot air adjusting door plate shaft 4, and the air volume of hot air entering the shaft seal is greatly reduced by the first labyrinth seal disc 2; then install a first segmentation gland 1 with first labyrinth sealed dish 2 matched with, install second labyrinth sealed dish 8, second segmentation gland 7 in proper order after that, form sealed cavity between first segmentation gland 1 and the hot-blast accent door board axle 4, sealed cavity inserts appearance gas cooling 6, seals with rubber seal 3 between second segmentation gland 7 and the door board axle 4 to reach and carry out the effect of high-efficient sealing to this hot-blast accent air door.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are intended to be covered by the scope of the present invention.
Claims (5)
1. The utility model provides a hot-blast accent door bearing seal structure of power plant boiler coal pulverizer, includes hot-blast accent door plate axle (4), its characterized in that, be provided with accent door bearing seal structure on hot-blast accent door plate axle (4), hot-blast accent door plate axle (4) and casing (5) junction external fixed mounting have a second labyrinth to seal dish (8), and second labyrinth seals dish (8) and fixes at the epaxial (4) of hot-blast accent door plate, fixed cover is equipped with first labyrinth seals dish (2) on hot-blast accent door plate axle (4), and is equipped with second subsection gland (7) and first subsection gland (1) on first labyrinth seals dish (2).
2. The shaft seal structure of the hot air adjusting door of the coal mill of the boiler of the power plant as claimed in claim 1, wherein the first labyrinth seal disc (2) is welded or fixed on the hot air adjusting door plate shaft (4) by screws and can rotate along with the hot air adjusting door plate shaft (4).
3. The shaft seal structure of the hot air damper of the coal mill of the boiler of the power plant as claimed in claim 1, wherein the second segment gland (7) and the hot air damper plate shaft (4) are sealed by a rubber sealing ring (3).
4. The power plant boiler coal mill hot air adjusting door shaft seal structure according to claim 1, wherein the sealed cavity access instrument is cooled by an air interface (6).
5. The shaft seal structure of the hot air damper of the coal mill of the boiler of the power plant as claimed in claim 1, wherein a sealed cavity is formed between the first segment gland (1) and the hot air damper plate shaft (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111217232.9A CN113915353A (en) | 2021-10-19 | 2021-10-19 | Hot-blast shaft seal structure of adjusting of power plant boiler coal pulverizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111217232.9A CN113915353A (en) | 2021-10-19 | 2021-10-19 | Hot-blast shaft seal structure of adjusting of power plant boiler coal pulverizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113915353A true CN113915353A (en) | 2022-01-11 |
Family
ID=79241541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111217232.9A Pending CN113915353A (en) | 2021-10-19 | 2021-10-19 | Hot-blast shaft seal structure of adjusting of power plant boiler coal pulverizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113915353A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203687083U (en) * | 2014-01-03 | 2014-07-02 | 马鞍山天宸密封制品科技有限公司 | Combination of air flue crank arm cut-off gate pivot base and sealing device |
| CN203809695U (en) * | 2014-04-18 | 2014-09-03 | 赵新东 | Medium speed coal mill lower frame body outer gas sealing device |
| CN205500156U (en) * | 2016-03-16 | 2016-08-24 | 酒泉钢铁(集团)有限责任公司 | Main and secondary bearing roller bearing sealing device of feeder |
| CN206495815U (en) * | 2017-02-15 | 2017-09-15 | 鞍山钢峰风机有限责任公司 | A kind of centrifugal fan axle sealing structure |
| CN208090066U (en) * | 2018-03-09 | 2018-11-13 | 张家口煜达电力科技有限公司 | Sealing device for door shaft of air door |
| CN214146617U (en) * | 2020-12-24 | 2021-09-07 | 重庆大唐国际石柱发电有限责任公司 | Novel maintenance-free air door shaft seal device |
-
2021
- 2021-10-19 CN CN202111217232.9A patent/CN113915353A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203687083U (en) * | 2014-01-03 | 2014-07-02 | 马鞍山天宸密封制品科技有限公司 | Combination of air flue crank arm cut-off gate pivot base and sealing device |
| CN203809695U (en) * | 2014-04-18 | 2014-09-03 | 赵新东 | Medium speed coal mill lower frame body outer gas sealing device |
| CN205500156U (en) * | 2016-03-16 | 2016-08-24 | 酒泉钢铁(集团)有限责任公司 | Main and secondary bearing roller bearing sealing device of feeder |
| CN206495815U (en) * | 2017-02-15 | 2017-09-15 | 鞍山钢峰风机有限责任公司 | A kind of centrifugal fan axle sealing structure |
| CN208090066U (en) * | 2018-03-09 | 2018-11-13 | 张家口煜达电力科技有限公司 | Sealing device for door shaft of air door |
| CN214146617U (en) * | 2020-12-24 | 2021-09-07 | 重庆大唐国际石柱发电有限责任公司 | Novel maintenance-free air door shaft seal device |
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