CN114576364A - Explosion-proof fan nitrogen gas bearing seal device - Google Patents

Explosion-proof fan nitrogen gas bearing seal device Download PDF

Info

Publication number
CN114576364A
CN114576364A CN202011391472.6A CN202011391472A CN114576364A CN 114576364 A CN114576364 A CN 114576364A CN 202011391472 A CN202011391472 A CN 202011391472A CN 114576364 A CN114576364 A CN 114576364A
Authority
CN
China
Prior art keywords
explosion
stage
nitrogen
shaft seal
ring
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
Application number
CN202011391472.6A
Other languages
Chinese (zh)
Inventor
程龙军
陶彬
蒲鹤
单晓雯
宫中昊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Petroleum and Chemical Corp
Sinopec Qingdao Safety Engineering Institute
Original Assignee
China Petroleum and Chemical Corp
Sinopec Qingdao Safety Engineering Institute
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by China Petroleum and Chemical Corp, Sinopec Qingdao Safety Engineering Institute filed Critical China Petroleum and Chemical Corp
Priority to CN202011391472.6A priority Critical patent/CN114576364A/en
Publication of CN114576364A publication Critical patent/CN114576364A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • F16J15/3268—Mounting of sealing rings
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention discloses a nitrogen shaft seal device of an explosion-proof fan, which comprises a shaft seal sleeve, wherein four stages of sealing rings are embedded in the inner wall of the shaft seal sleeve at intervals, the inner ring at the bottom of each sealing ring is respectively embedded with a graphite lining ring, a transmission shaft sleeve which can be penetrated by a fan transmission shaft is sleeved in the graphite lining ring, and a cavity is formed between the transmission shaft sleeve and the shaft seal sleeve; the left side of the first-stage sealing ring is glued with a first-stage PTFE buffer sheet, and the left side surface of the first-stage PTFE buffer sheet is aligned with the left end surface of the shaft seal sleeve; the left side of the second-stage sealing ring is glued with a second-stage PTFE buffer sheet, and a nitrogen pipe which is introduced into the cavity is arranged on the shaft seal sleeve between the third-stage sealing ring and the fourth-stage sealing ring; and the left end surface of the shaft sealing sleeve is provided with a bolt hole and an O-shaped sealing ring. The nitrogen shaft seal device disclosed by the invention can resist the impact of explosion shock waves when the blower housing 20 is exploded, and simultaneously ensures that the gas conveyed in the blower is zero to leak into the atmosphere, thereby ensuring the safety of peripheral equipment and personnel of the blower.

Description

Explosion-proof fan nitrogen gas bearing seal device
Technical Field
The invention relates to a shaft seal device, in particular to a nitrogen shaft seal device of an explosion-proof fan.
Background
Explosive hazard zones are primarily classified by the frequency and duration of the presence of explosive materials within such hazard zone. Except for coal mines, the explosion-proof dangerous area of China is divided into an explosive gas area and an explosive dust area, and an explosion 0 area refers to an environment where explosive gas or dust continuously appears or appears for a long time, such as: the space above the liquid level of the storage tank, a gas pipeline in the tank area, a dock ship shore butt joint pipeline and the like. The explosion 1 region refers to an environment in which an explosive gas or dust mixture may occur during normal operation, and the explosion 2 region refers to an environment in which an explosive gas or dust mixture may not occur during normal operation, or an environment in which an explosive gas or dust mixture exists only for a short time if at all. The equipment meeting the 0-zone explosion-proof requirement can be used in the 1-zone or 2-zone site, the 1-zone equipment can be used in the 2-zone site, and the reverse is not true.
Fans are widely used in places containing explosive mixtures, such as petroleum, chemical engineering, pharmacy, metallurgy, urban gas stations and the like, and therefore, the fans need to have basic performances required by products and explosion-proof measures for protection. Without explosion proof qualities, the resulting electrical sparks, the temperature rise from friction and impact of mechanical parts, and mechanical sparks are sources of ignition that may ignite the surrounding environment, with catastrophic consequences in the event of an explosion. Some special gases are such as: benzene, hydrogen sulfide and other gases with extremely high fatality rate are leaked in low quantity, and the explosion-proof fan in the explosion zero region requires to convey the gases with zero leakage.
In case of explosion inside the blower, the blower shell needs to bear explosion impact, and the shaft end seal also needs to bear explosion impact. If the shaft end seal is broken or cracked due to explosion impact, flammable gas inside the fan leaks into the atmosphere, and serious explosion or fire can be caused.
At present, the domestic application has great potential safety hazard and environmental protection risk in the fan shaft seal of zero region occasion, so need urgently to develop an explosion zero region explosion-proof fan shaft seal device, can tolerate the explosion impact when the fan is inside to explode, can guarantee that the gas that zero region fan carried is zero to reveal outside the fan simultaneously, ensures personal and property safety.
Disclosure of Invention
In order to solve the technical problems, the invention provides a nitrogen shaft seal device of an explosion-proof fan, which can resist the impact of explosion shock waves when an explosion occurs in a fan shell 20, and simultaneously ensure that gas conveyed in the fan is leaked to the atmosphere to ensure the safety of peripheral equipment and personnel of the fan.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a nitrogen shaft seal device of an explosion-proof fan comprises a shaft seal sleeve, wherein four stages of sealing rings are embedded in the inner wall of the shaft seal sleeve at intervals, graphite lining rings are respectively embedded in the inner rings at the bottoms of the sealing rings, a transmission shaft sleeve which can be penetrated by a fan transmission shaft is sleeved in the graphite lining rings, and a cavity is formed between the transmission shaft sleeve and the shaft seal sleeve; the left side of the first-stage sealing ring is glued with a first-stage PTFE buffer sheet, and the left side surface of the first-stage PTFE buffer sheet is aligned with the left end surface of the shaft seal sleeve; the left side of the second-stage sealing ring is glued with a second-stage PTFE buffer sheet, and a nitrogen pipe which is introduced into the cavity is arranged on the shaft seal sleeve between the third-stage sealing ring and the fourth-stage sealing ring; and the left end surface of the shaft sealing sleeve is provided with a bolt hole and an O-shaped sealing ring.
In the above scheme, the sealing ring is made of PPS material.
In the scheme, the first-stage graphite lining ring is embedded in the inner ring at the bottom of the first-stage sealing ring, and the gap between the first-stage graphite lining ring and the transmission shaft sleeve is 0.5 mm.
In the scheme, a second-stage graphite lining ring is embedded in the inner ring at the bottom of the second-stage sealing ring, and the gap between the second-stage graphite lining ring and the transmission shaft sleeve is 0.3 mm.
In the scheme, a third-stage graphite lining ring is embedded in the inner ring at the bottom of the third-stage sealing ring, and the gap between the third-stage graphite lining ring and the transmission shaft sleeve is 0.1 mm.
In the scheme, a fourth-stage graphite lining ring is embedded in the inner ring at the bottom of the fourth-stage sealing ring, and the gap between the fourth-stage graphite lining ring and the transmission shaft sleeve is 0.1 mm.
In the scheme, the nitrogen pipe is connected with a nitrogen joint through threads, and the nitrogen joint is connected with a nitrogen pipeline of 0.2 Mpa.
In the above scheme, the diameter of the nitrogen pipe is 8 mm.
Through the technical scheme, the explosion-proof fan nitrogen shaft seal device provided by the invention has the following beneficial effects:
1. the first-stage PTFE buffer sheet and the second-stage PTFE buffer sheet can effectively offset the explosion impact force generated when the blower housing 20 is exploded, avoid the fragmentation of the sealing ring and eliminate the possibility that explosion flame is diffused from the shaft seal position.
2. A nitrogen pipe is arranged between the third-stage ring seal and the fourth-stage ring seal. The nitrogen pipe joint is connected with a nitrogen gas source, and nitrogen ensures that gas in the fan shell 20 cannot be leaked to the outside of the fan when the fan normally operates.
3. The nitrogen shaft seal device can resist the impact of explosion shock waves when an explosion occurs in the fan shell 20, and simultaneously ensures that no gas conveyed in the fan leaks into the atmosphere, thereby ensuring the safety of peripheral equipment and personnel of the fan.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic view of an installation position of a nitrogen shaft seal device of an explosion-proof blower according to an embodiment of the present invention;
FIG. 2 is a sectional view of a nitrogen shaft seal device of an explosion-proof blower according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a fan explosion testing apparatus according to an embodiment of the present invention.
In the figure, 1, a nitrogen gas shaft seal device; 2. a first stage seal ring; 3. a second stage seal ring; 4. a second stage graphite liner ring; 5. a third stage seal ring; 6. a third stage graphite liner ring; 7. a nitrogen gas joint; 8. a nitrogen gas pipe; 9. a fourth stage seal ring; 10. a fourth grade graphite liner ring; 11. bolt holes; 12. an O-shaped sealing ring; 13. a shaft envelope; 14. a first-stage PTFE buffer sheet; 15. a second-stage PTFE buffer sheet; 16. a first stage graphite liner ring; 17. a driving shaft sleeve; 18. a fan transmission shaft; 19. an explosion-proof motor; 20. a fan housing; 21. an impeller; 22. a flame arrestor; 23. a gas inlet valve; 24. a gas outlet valve; 25. a gas circulation line; 26. a throttle valve; 27. a temperature sensor; 28. a flame sensor; 29. a bellows; 30. an infrared flame sensor; 31. a pressure sensor; 32. an explosion-proof fan; 33. a spark plug; 34. a cavity.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The invention provides an explosion-proof fan nitrogen gas shaft seal device, as shown in figure 1, when in installation, an explosion-proof motor 19 is connected with an impeller 21 positioned in a fan shell 20 through a fan transmission shaft 18, the fan transmission shaft 18 penetrates through a transmission shaft sleeve 17 of the nitrogen gas shaft seal device 1, the nitrogen gas shaft seal device 1 slides to the back side of the fan shell 20, and the nitrogen gas shaft seal device 1 is fixedly installed on the back side of the fan shell 20 by screwing bolts into bolt holes 11. The O-shaped sealing ring 12 is extruded and deformed under the action of the bolt fastening force, and the left end face of the nitrogen shaft seal device 1 and the shell face at the back side of the fan complete absolute sealing through the extruded O-shaped sealing ring 12. Flame arresters 22 are arranged at the air inlet and the air outlet of the fan shell 20. When the fan is in operation, the transmission shaft sleeve 17 rotates along with the fan transmission shaft 18.
As shown in fig. 2, the nitrogen shaft sealing device 1 is provided with a first-stage seal ring 2, a second-stage seal ring 3, a third-stage seal ring 5, and a fourth-stage seal ring 9. The first, second, third and fourth stage seal rings 2, 3, 5 and 9 are mounted in grooves in the shaft envelope 13. A cavity 34 exists between the outdrive 17 and the shaft seal gland 13.
Set up the nitrogen gas pipe 8 that lets in cavity 34 between third level sealing ring 5 and the fourth level sealing ring 9 in the nitrogen gas shaft seal device 1, the 8 tops of nitrogen gas pipe are connected through the screw thread with nitrogen gas joint 7, and nitrogen gas joint 7 connects 0.2 Mpa's nitrogen gas pipeline, and 0.2Mpa nitrogen gas is ensured when the fan normal operating, and the fan is outside to unable the revealing of the interior gas of fan housing 20. The third sealing ring 5 in the nitrogen shaft seal device 1 seals 0.2Mpa nitrogen, greatly reduces the nitrogen of 0.2Mpa to enter the fan shell 20, and reduces the nitrogen loss. The fourth stage sealing ring 9 in the nitrogen shaft sealing device 1 seals 0.2Mpa nitrogen, thereby greatly reducing the nitrogen of 0.2Mpa entering the atmosphere and reducing the nitrogen loss.
The first-stage sealing ring 2 is positioned at the leftmost side of the nitrogen shaft seal device 1, and the main body of the first-stage sealing ring 2 is made of PPS (polyphenylene sulfide) material. The left side of the first-stage sealing ring 2 is glued with a first-stage PTFE buffer sheet 14, the left side surface of the first-stage PTFE buffer sheet 14 is aligned with the left end surface of the shaft seal sleeve 13, and the explosion impact force generated when 80% of the fan shell 20 explodes can be offset by the first-stage PTFE buffer sheet 14 in the first-stage sealing ring 2. The inner ring at the bottom of the first-stage sealing ring 2 is embedded with a first-stage graphite lining ring 16, the gap between the first-stage graphite lining ring 16 and the transmission shaft sleeve 17 is 0.5mm, the first-stage graphite lining ring 16 has excellent self-lubricating property, and when the first-stage graphite lining ring 16 and the transmission shaft sleeve 17 rub, the generation of friction sparks and hot surfaces is avoided.
The second stage sealing ring 3 is arranged in a second groove of the shaft envelope 13, and the material of the main body of the second stage sealing ring 3 is PPS material. The second level PTFE buffer sheet 15 that splices in second level sealing ring 3 left side, the explosion impact force when the explosion can offset 20% remaining fan casing 20 in the second level sealing ring 3 in second level PTFE buffer sheet 15. Second level graphite lining ring 4 is inlayed and is installed to second level sealing ring 3 bottom inner circle, and the clearance between second level graphite lining ring 4 and the driving sleeve 17 is 0.3mm, and second level graphite lining ring 4 has good self-lubricating nature, and second level graphite lining ring 4 avoids the production of friction spark and hot surface when taking place the friction with driving sleeve 17.
The third stage sealing ring 5 is installed in a third groove of the shaft sleeve 13, and the material of the main body of the third stage sealing ring 5 is PPS material. Third level graphite lining ring 6 is inlayed and is installed to third level sealing ring 5 bottom inner circle, and the clearance between third level graphite lining ring 6 and the driving sleeve 17 is 0.1mm, and third level graphite lining ring 6 has good self-lubricity, and when third level graphite lining ring 6 and driving sleeve 17 take place the friction, the production of friction spark and hot surface is avoided.
The fourth stage seal ring 9 is installed in a fourth groove of the shaft envelope 13, and the material of the fourth stage seal ring 9 is PPS material. Fourth level graphite lining ring 10 is inlayed to installation of fourth level sealing ring 9 bottom inner circle, and the clearance between fourth level graphite lining ring 10 and the driving sleeve 17 is 0.1mm, and fourth level graphite lining ring 10 has good self-lubricity, and when fourth level graphite lining ring 10 and driving sleeve 17 take place the friction, the production of friction spark and hot surface is avoided.
The fan explosion testing device shown in fig. 3 is adopted to carry out an explosion-proof test, a pressure sensor 31 is arranged on an explosion-proof fan 32, a flame sensor 28 is arranged on a gas circulation pipeline 25 at an air inlet and an air outlet of the explosion-proof fan 32, a temperature sensor 27 is arranged on the gas circulation pipeline 25 at the air inlet of the explosion-proof fan 32, and flame arresters 22 and corrugated pipes 29 are arranged at the air inlet and the air outlet of the explosion-proof fan 32. An infrared flame sensor 30 is arranged outside the explosion-proof fan 32, a spark plug 33 is arranged inside the explosion-proof fan 32, and a throttle valve 26 is arranged on the gas circulation pipeline 25 between the gas inlet valve 23 and the gas outlet valve 24. The gas enters the gas circulation pipeline 25 from the gas inlet valve 23, passes through the corrugated pipe 29, the flame arrester 22, enters the explosion-proof fan 32, passes through the flame arrester 22 and the corrugated pipe 29, and is discharged from the gas outlet valve 24. The specific test is as follows:
test example 1:
taking the example that the explosion zero-region explosion-proof fan 32 delivers benzene gas, the quantity of benzene delivered by the explosion zero-region explosion-proof fan 32 is 1000m3And h, the outlet pressure of the explosion-proof fan 32 in the explosion zero region is 12 Kpa.
The diameter of a fan impeller is set to be 800mm, the working power of an explosion-proof motor is set to be 30KW, the rotating speed of an explosion-proof motor 19 is set to be 3000rpm, the concentration value of benzene gas at the position of the nitrogen shaft seal device 1 is detected in real time by adopting an FID (flame ionization detector) technology at the rotating speed, and the concentration of the benzene gas at the position of the nitrogen shaft seal device 1 is 0ppm under the condition of continuously monitoring for 72 hours.
According to the blower explosion testing device shown in fig. 3, benzene and air mixed gas is injected into a gas circulation pipeline 25, a blower for conveying benzene gas is installed on the blower explosion testing device, the rotation speed of the blower is 3000rpm, the blower is ignited in a blower shell 20 through a spark plug 33, the pressure of a pressure sensor 31 at the moment of ignition is increased to 0.63Mpa, a temperature sensor 27 in the gas circulation pipeline 25 does not detect temperature rise at the moment of explosion, a flame sensor 28 in the gas circulation pipeline 25 does not detect flame at the moment of explosion, an infrared flame sensor 30 at the position of a nitrogen shaft seal device 1 does not detect flame, the condition that the internal explosion flame of the blower is not transmitted to a place outside a blower body is proved, the blower for conveying benzene is tested to be qualified in an explosion test, and the nitrogen shaft seal device 1 in the blower for conveying benzene can ensure the safety of an explosion-free-zone explosion-proof blower 32 for conveying benzene gas.
Test example 2:
taking the example that the explosion zero zone explosion-proof fan 32 delivers hydrogen sulfide gas, the explosion zero zone explosion-proof fan 32 delivers hydrogen sulfide gas with a quantity of 1500m3And h, the outlet pressure of the explosion-proof fan 32 in the explosion zero zone is 10 Kpa.
The diameter of a fan impeller is set to be 850mm, the working power of an explosion-proof motor is set to be 32KW, the rotating speed of an explosion-proof motor 19 is set to be 3000rpm, a hydrogen sulfide detector detects the concentration value of hydrogen sulfide gas at the position of the nitrogen shaft seal device 1 in real time at the rotating speed, and the concentration of the hydrogen sulfide gas at the position of the nitrogen shaft seal device 1 is 0ppm under the condition of continuously monitoring for 78 hours.
According to the blower explosion testing device shown in fig. 3, a hydrogen sulfide gas and air mixed gas is injected into a gas circulating pipeline 25, a blower for conveying the hydrogen sulfide gas is arranged on the blower explosion testing device, the rotating speed of the blower is 3000rpm, the ignition is carried out in the fan shell 20 through the spark plug 33, the pressure of the pressure sensor 31 rises to 0.55Mpa at the moment of ignition, the temperature sensor 27 in the gas circulating pipeline 25 does not detect temperature rise at the moment of explosion, the flame sensor 28 in the gas circulating pipeline 25 does not detect flame at the moment of explosion, the infrared flame sensor 30 at the position of the nitrogen shaft seal device 1 does not detect flame, the situation that the flame is exploded inside the fan and is not transmitted to the place outside the fan body is shown, the fan explosion test for conveying hydrogen sulfide is qualified, and the safety of conveying the hydrogen sulfide by the explosion-zero-zone explosion-proof fan through the nitrogen shaft seal device 1 in the fan for conveying the hydrogen sulfide is proved.
Test example 3:
taking the example that the explosion-proof blower 32 in the explosion zero region delivers ethylene gas, the quantity of ethylene gas delivered by the explosion-proof blower 32 in the explosion zero region is 1300m3And h, the outlet pressure of the explosion-proof fan 32 in the explosion zero region is 12 Kpa.
The diameter of a fan impeller is set to be 800mm, the working power of an explosion-proof motor is set to be 31KW, the rotating speed of an explosion-proof motor 19 is set to be 3000rpm, the concentration value of ethylene gas at the position of an ethylene gas shaft seal device 1 is detected in real time by adopting an FID (flame ionization Detector) technology at the rotating speed, and the concentration value of the ethylene gas at the position of a nitrogen gas shaft seal device 1 is 0ppm under the condition of continuously monitoring for 96 hours.
According to the blower explosion test device shown in fig. 3, the mixed gas of ethylene gas and air is injected into the gas circulation pipeline 25, the blower for delivering ethylene gas is installed on the blower explosion test device, the rotating speed of the blower is 3000rpm, the ignition is carried out in the fan shell 20 through the spark plug 33, the pressure of the pressure sensor 31 at the moment of ignition is increased to 0.75Mpa, the temperature sensor 27 in the gas circulating pipeline 25 does not detect the temperature rise at the moment of explosion, the flame sensor 28 in the gas circulating pipeline 25 does not detect the flame at the moment of explosion, the infrared flame sensor 30 at the position of the nitrogen shaft seal device 1 does not detect the flame, the condition that the explosion flame inside the fan is not transmitted to the place outside the fan body is shown, the fan explosion test for conveying the ethylene gas is qualified, and the condition that the nitrogen shaft seal device 1 in the fan for conveying the ethylene gas can ensure the safety of the ethylene gas conveyed by the explosion-proof fan 32 in the explosion zero region is proved.
Test example 4:
taking the example that the explosion zero-region explosion-proof fan 32 delivers the styrene gas, the quantity of the ethylene delivered by the explosion zero-region explosion-proof fan 32 is 1500m3And h, the outlet pressure of the explosion-proof fan 32 in the explosion zero region is 8 Kpa.
The diameter of a fan impeller is set to be 850mm, the working power of an explosion-proof motor is set to be 29KW, the rotating speed of the explosion-proof motor is set to be 3000rpm, the concentration value of styrene gas at the position of a styrene gas shaft seal device 1 is detected in real time by adopting an FID (flame ionization detector) technology at the rotating speed, and the concentration of the styrene gas at the position of the nitrogen gas shaft seal device 1 is 0ppm under the condition of continuously monitoring for 76 hours.
According to the blower explosion test device shown in fig. 3, a mixed gas of styrene gas and air is injected into the gas circulation pipeline 25, a blower for conveying the styrene gas is installed on the blower explosion test device, the blower rotates at 3000rpm, the ignition is carried out in the fan shell 20 through the spark plug 33, the pressure of the pressure sensor 31 rises to 0.83Mpa at the moment of ignition, the temperature sensor 27 in the gas circulating pipeline 25 does not detect temperature rise at the moment of explosion, the flame sensor 28 in the gas circulating pipeline 25 does not detect flame at the moment of explosion, the infrared flame sensor 30 at the position of the nitrogen shaft seal device 1 does not detect flame, the condition that the internal explosion flame of the fan is not transmitted to the place outside the fan body is shown, the fan explosion test for conveying styrene gas is qualified, and the nitrogen shaft seal device 1 in the fan for conveying styrene gas can ensure the safety of conveying styrene gas by the explosion zero-zone explosion-proof fan 32.
Example 4:
taking the example that the explosion-proof blower 32 in the explosion zero region delivers gasoline oil gas, the quantity of ethylene delivered by the explosion-proof blower 32 in the explosion zero region is 1200m3And h, the outlet pressure of the explosion-proof fan 32 in the explosion zero region is 5 Kpa.
The diameter of a fan impeller is set to 750mm, the working power of an explosion-proof motor is set to 18KW, the rotating speed of an explosion-proof motor 19 is set to 3000rpm, the concentration value of gasoline oil gas at the position of a gasoline oil gas shaft seal device 1 is detected in real time by adopting an FID (flame ionization Detector) technology at the rotating speed, and the concentration of the gasoline oil gas at the position of a nitrogen gas shaft seal device 1 is 0ppm under the condition of continuously monitoring for 82 hours.
According to the blower explosion testing device shown in figure 3, the mixed gas of gasoline oil gas and air is injected into a gas circulation pipeline 25, a blower for conveying the gasoline oil gas is arranged on the blower explosion testing device, the rotating speed of the blower is 3000rpm, the ignition is carried out in the fan shell 20 through the spark plug 33, the pressure of the pressure sensor 31 rises to 0.91Mpa at the moment of ignition, the temperature sensor 27 in the gas circulating pipeline 25 does not detect temperature rise at the moment of explosion, the flame sensor 28 in the gas circulating pipeline 25 does not detect flame at the moment of explosion, the infrared flame sensor 30 at the position of the nitrogen shaft seal device 1 does not detect flame, the situation that the inner explosion flame of the fan is not transmitted to the place outside the fan body is shown, the fan explosion test for conveying gasoline oil gas is qualified, and the safety that the explosion zero-zone explosion-proof fan 32 conveys the gasoline oil gas can be ensured by the nitrogen shaft seal device 1 in the fan for conveying the gasoline oil gas.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. A nitrogen shaft seal device of an explosion-proof fan comprises a shaft seal sleeve and is characterized in that four stages of sealing rings are embedded in the inner wall of the shaft seal sleeve at intervals, graphite lining rings are respectively embedded in the inner rings at the bottoms of the sealing rings, a transmission shaft sleeve capable of allowing a fan transmission shaft to penetrate through is sleeved in the inner part of each graphite lining ring, and a cavity is formed between the transmission shaft sleeve and the shaft seal sleeve; the left side of the first-stage sealing ring is glued with a first-stage PTFE buffer sheet, and the left side surface of the first-stage PTFE buffer sheet is aligned with the left end surface of the shaft seal sleeve; the left side of the second-stage sealing ring is glued with a second-stage PTFE buffer sheet, and a nitrogen pipe which is introduced into the cavity is arranged on the shaft seal sleeve between the third-stage sealing ring and the fourth-stage sealing ring; and the left end surface of the shaft sealing sleeve is provided with a bolt hole and an O-shaped sealing ring.
2. The explosion-proof fan nitrogen shaft seal device of claim 1, wherein the material of said sealing ring is PPS material.
3. The explosion-proof fan nitrogen shaft seal device according to claim 1 or 2, characterized in that a first-stage graphite lining ring is embedded in an inner ring at the bottom of the first-stage sealing ring, and a gap between the first-stage graphite lining ring and the transmission shaft sleeve is 0.5 mm.
4. The explosion-proof fan nitrogen shaft seal device according to claim 1 or 2, characterized in that a second-stage graphite lining ring is embedded in an inner ring at the bottom of the second-stage sealing ring, and a gap between the second-stage graphite lining ring and the transmission shaft sleeve is 0.3 mm.
5. The explosion-proof fan nitrogen shaft seal device according to claim 1 or 2, characterized in that a third stage graphite lining ring is embedded in an inner ring at the bottom of the third stage sealing ring, and a gap between the third stage graphite lining ring and the transmission shaft sleeve is 0.1 mm.
6. The explosion-proof fan nitrogen shaft seal device according to claim 1 or 2, characterized in that a fourth-stage graphite lining ring is embedded in an inner ring at the bottom of the fourth-stage sealing ring, and a gap between the fourth-stage graphite lining ring and the transmission shaft sleeve is 0.1 mm.
7. The explosion-proof fan nitrogen shaft seal device according to claim 1 or 2, wherein the nitrogen pipe is connected with a nitrogen joint through a thread, and the nitrogen joint is connected with a nitrogen pipeline of 0.2 Mpa.
8. The explosion proof fan nitrogen shaft seal device of claim 1, wherein the nitrogen tube diameter is 8 mm.
CN202011391472.6A 2020-12-02 2020-12-02 Explosion-proof fan nitrogen gas bearing seal device Pending CN114576364A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011391472.6A CN114576364A (en) 2020-12-02 2020-12-02 Explosion-proof fan nitrogen gas bearing seal device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011391472.6A CN114576364A (en) 2020-12-02 2020-12-02 Explosion-proof fan nitrogen gas bearing seal device

Publications (1)

Publication Number Publication Date
CN114576364A true CN114576364A (en) 2022-06-03

Family

ID=81766901

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011391472.6A Pending CN114576364A (en) 2020-12-02 2020-12-02 Explosion-proof fan nitrogen gas bearing seal device

Country Status (1)

Country Link
CN (1) CN114576364A (en)

Similar Documents

Publication Publication Date Title
US5498007A (en) Double gas barrier seal
KR900700801A (en) Spiral-groove seal system for high vapor pressure liquids
KR940007405A (en) Seal array spiral seal system and how to seal against leaks in processing fluid
CN101639124A (en) Nitrogen sealing device
CN114576364A (en) Explosion-proof fan nitrogen gas bearing seal device
RU2003120045A (en) ROTARY CRYOTECHNICAL CONNECTION FOR FEEDING LINES OF CRYOGENIC FLUID AND CRYOGENIC ROCKET ENGINES
CN103939607A (en) Integrated shaft end sealing device
CN114576183B (en) Explosion-proof multistage centrifugal fan in explosion zero region
CN205639619U (en) Combined sealing device for liquid oxygen pump
CN107882768B (en) A kind of unsteady flow sealing control method and its device
CN114576184B (en) Explosion-proof centrifugal fan in explosion zero region
CN104454482A (en) Conveying pump provided with mechanical seal leakage detection device
CN210860195U (en) Embedded fireproof sealing structure for pipeline connector
CN211649052U (en) Sealing device for high-temperature aromatic hydrocarbon pump
CN113027668A (en) Hydraulic motor
CN212120402U (en) Explosion-proof type decanter centrifuge based on carbocycle is sealed
CN218564389U (en) Sealing structure for casing and main shaft of high-pressure centrifugal fan
CN110681498A (en) Explosion-proof type decanter centrifuge based on carbocycle is sealed
CN216278631U (en) Protection architecture of vertical high temperature carbide slurry pump
CN218893040U (en) Internal circulation explosion-proof electric roller
CN211175796U (en) Flame-retardant heat-resistant insulating stainless steel corrugated hose for conveying fuel gas
JPH09196185A (en) Seal device for fluid machinery
CN210860185U (en) Fireproof sealing structure with sealing cavity and heat insulation cavity for pipeline connector
CN214035879U (en) Oil and gas isolation device of electric control system
CN213513217U (en) Negative-pressure fire-retarding explosion-discharging device for gas pipeline for iron and steel enterprise

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination