An explosion-proof blower nitrogen shaft sealing device

Abstract

The present invention discloses an explosion-proof blower nitrogen shaft seal device, including a shaft seal sleeve, wherein the inner wall of the shaft seal sleeve is inlaid with four-stage sealing rings at intervals, and the bottom inner ring of each sealing ring is inlaid with a graphite lining ring, and the graphite lining ring is provided with a transmission shaft sleeve for the blower drive shaft to pass through, and there is a cavity between the transmission shaft sleeve and the shaft seal sleeve; the left side of the first-stage sealing ring is glued with the 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 the second-stage PTFE buffer sheet, and the shaft seal sleeve between the third-stage sealing ring and the fourth-stage sealing ring is installed with a nitrogen pipe passing into the cavity; the left end surface of the shaft seal sleeve is provided with a bolt hole and an O-ring. The nitrogen shaft seal device disclosed by the present invention can not only withstand the impact of the explosion shock wave when an explosion occurs in the blower housing 20, but also ensure that the gas transported in the blower is leaked to the atmosphere without leakage, thereby ensuring the safety of the blower peripheral equipment and personnel.

Description

Technical Field

[0001] The invention relates to a shaft sealing device, in particular to a nitrogen shaft sealing device for an explosion-proof blower. Background Art

[0002] Explosion-hazardous areas are mainly divided according to the frequency and duration of the occurrence of explosive substances in this hazardous area. In addition to coal mines, my country's explosion-proof hazardous areas are divided into explosive gas areas and combustible dust areas. Explosion Zone 0 refers to an environment where explosive gas or dust appears continuously or for a long time, such as: the space above the liquid level of the storage tank, the gas pipeline in the tank area, and the dock ship-shore docking pipeline. Explosion Zone 1 refers to an environment where explosive gas or dust mixtures may appear during normal operation, and Explosion Zone 2 refers to an environment where explosive gas or dust mixtures are unlikely to appear during normal operation, or even if they appear, they only exist for a short time. Equipment that meets the explosion-proof requirements of Zone 0 can be used in Zone 1 or Zone 2 locations, and Zone 1 equipment can be used in Zone 2 locations, but not vice versa.

[0003] Fans are widely used in places containing explosive mixtures such as petroleum, chemical, pharmaceutical, metallurgy, and urban gas stations. Therefore, in addition to the basic performance required by the product itself, fans also need to be protected by explosion-proof measures. If they do not have explosion-proof quality, the generated electrical sparks, the temperature rise caused by the friction and impact of mechanical parts, and mechanical sparks are ignition sources that may detonate the surrounding environment, and once an explosion occurs, it will have catastrophic consequences. Some special gases such as benzene, hydrogen sulfide, and other gases with extremely high lethality rates due to low-level leakage, explosion-proof fans in the zero-zone explosion zone are required to transport such gases with zero leakage.

[0004] If an explosion occurs inside the explosion-proof fan currently used in China, in addition to the fan casing needing to withstand the explosion impact, the shaft end seal also needs to withstand the explosion impact. If the shaft end seal is ruptured or broken by the explosion impact, the flammable gas inside the fan will leak into the atmosphere, causing a more serious explosion or fire.

[0005] At present, there are major safety hazards and environmental risks in the fan shaft seals used in zero-zone situations in China. Therefore, there is an urgent need to develop an explosion-proof zero-zone fan shaft seal device that can not only withstand the impact of the explosion when an explosion occurs inside the fan, but also ensure that the gas transported by the zero-zone fan leaks out of the fan, thereby ensuring personal and property safety. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides an explosion-proof blower nitrogen shaft seal device, so as to achieve the purpose of withstanding the impact of the explosion shock wave when an explosion occurs in the blower casing 20, while ensuring zero leakage of the gas transported in the blower into the atmosphere, thereby ensuring the safety of the blower peripheral equipment and personnel.

[0007] To achieve the above object, the technical solution of the present invention is as follows:

[0008] A nitrogen shaft seal device for an explosion-proof blower comprises a shaft seal sleeve, wherein the inner wall of the shaft seal sleeve is inlaid with four-stage sealing rings at intervals, the bottom inner ring of each sealing ring is inlaid with a graphite lining ring, the inside of the graphite lining ring is provided with a transmission shaft sleeve for the blower drive shaft to pass through, and there is a cavity between the transmission shaft sleeve and the shaft seal sleeve; the left side of the first-stage sealing ring is glued to the 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 to the second-stage PTFE buffer sheet, and a nitrogen pipe leading to the cavity is installed on the shaft seal sleeve between the third-stage sealing ring and the fourth-stage sealing ring; the left end surface of the shaft seal sleeve is provided with a bolt hole and an O-ring.

[0009] In the above solution, the sealing ring is made of PPS material.

[0010] In the above scheme, the bottom inner ring of the first-stage sealing ring is inlaid with a first-stage graphite lining ring, and the gap between the first-stage graphite lining ring and the transmission shaft sleeve is 0.5 mm.

[0011] In the above scheme, the bottom inner ring of the second-stage sealing ring is inlaid with a second-stage graphite lining ring, and the gap between the second-stage graphite lining ring and the transmission shaft sleeve is 0.3 mm.

[0012] In the above scheme, the inner ring at the bottom of the third-stage sealing ring is inlaid with a third-stage graphite lining ring, and the gap between the third-stage graphite lining ring and the transmission shaft sleeve is 0.1 mm.

[0013] In the above scheme, the inner ring at the bottom of the fourth-stage sealing ring is inlaid with a fourth-stage graphite lining ring, and the gap between the fourth-stage graphite lining ring and the transmission shaft sleeve is 0.1 mm.

[0014] In the above scheme, the nitrogen pipe is threadedly connected with a nitrogen connector, and the nitrogen connector is connected to a 0.2Mpa nitrogen pipeline.

[0015] In the above scheme, the diameter of the nitrogen tube is 8 mm.

[0016] Through the above technical solution, the explosion-proof blower nitrogen shaft seal device provided by the present invention has the following beneficial effects:

[0017] 1. The first-stage PTFE buffer sheet and the second-stage PTFE buffer sheet of the present invention can effectively offset the impact force of the explosion when an explosion occurs in the fan housing 20, avoid the breakage of the sealing ring, and eliminate the possibility of the explosion flame spreading from the shaft seal position.

[0018] 2. In the present invention, a nitrogen pipe is arranged between the third-stage ring seal and the fourth-stage ring seal. The nitrogen pipe joint is connected to a nitrogen gas source, and the nitrogen ensures that the gas in the fan housing 20 cannot leak to the outside of the fan when the fan is operating normally.

[0019] 3. The nitrogen shaft seal device of the present invention can withstand the impact of the explosion shock wave when an explosion occurs in the fan housing 20, and at the same time ensure zero leakage of the gas transported in the fan to the atmosphere, thereby ensuring the safety of the peripheral equipment and personnel of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0021] Figure 1 A schematic diagram of the installation position of a nitrogen shaft seal device for an explosion-proof blower disclosed in an embodiment of the present invention;

[0022] Figure 2 A cross-sectional view of an explosion-proof blower nitrogen shaft seal device disclosed in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of a wind turbine explosion testing device disclosed in an embodiment of the present invention.

[0024] In the figure, 1, nitrogen shaft seal device; 2, first-stage sealing ring; 3, second-stage sealing ring; 4, second-stage graphite lining ring; 5, third-stage sealing ring; 6, third-stage graphite lining ring; 7, nitrogen joint; 8, nitrogen pipe; 9, fourth-stage sealing ring; 10, fourth-stage graphite lining ring; 11, bolt hole; 12, O-ring; 13, shaft seal sleeve; 14, first-stage PTFE buffer sheet; 15, second-stage PTFE buffer sheet; 16, first-stage graphite Ink lining ring; 17. Drive sleeve; 18. Fan drive shaft; 19. Explosion-proof motor; 20. Fan casing; 21. Impeller; 22. Flame arrester; 23. Gas inlet valve; 24. Gas outlet valve; 25. Gas circulation pipeline; 26. Throttle valve; 27. Temperature sensor; 28. Flame sensor; 29. ​​Bellows; 30. Infrared flame sensor; 31. Pressure sensor; 32. Explosion-proof fan; 33. Spark plug; 34. Cavity. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] The present invention provides an explosion-proof blower nitrogen shaft sealing device, such as Figure 1As shown, during installation, the explosion-proof motor 19 is connected to the impeller 21 located in the fan housing 20 through the fan drive shaft 18, the fan drive shaft 18 passes through the drive shaft sleeve 17 of the nitrogen shaft seal device 1, the nitrogen shaft seal device 1 slides to the back side of the fan housing 20, and the nitrogen shaft seal device 1 is fixedly installed on the back side of the fan housing 20 by screwing the bolts into the bolt holes 11. The O-ring 12 is squeezed and deformed under the action of the bolt tightening force, and the left end face of the nitrogen shaft seal device 1 and the back side of the fan casing surface are absolutely sealed by the squeezed O-ring 12. Flame arresters 22 are set at the air inlet and outlet of the fan housing 20. During operation, the drive shaft sleeve 17 rotates with the fan drive shaft 18.

[0027] like Figure 2 As shown, the nitrogen shaft seal device 1 is provided with a first-stage sealing ring 2, a second-stage sealing ring 3, a third-stage sealing ring 5 and a fourth-stage sealing ring 9. The first-stage sealing ring 2, the second-stage sealing ring 3, the third-stage sealing ring 5 and the fourth-stage sealing ring 9 are installed in the groove of the shaft seal sleeve 13. There is a cavity 34 between the transmission shaft sleeve 17 and the shaft seal sleeve 13.

[0028] A nitrogen pipe 8 leading to the cavity 34 is arranged between the third-stage sealing ring 5 and the fourth-stage sealing ring 9 in the nitrogen shaft sealing device 1. The top of the nitrogen pipe 8 is connected to the nitrogen connector 7 by threads. The nitrogen connector 7 is connected to a 0.2Mpa nitrogen pipeline. The 0.2Mpa nitrogen ensures that when the fan is operating normally, the gas in the fan housing 20 cannot leak to the outside of the fan. The third-stage sealing ring 5 in the nitrogen shaft sealing device 1 seals the 0.2Mpa nitrogen, greatly reducing the 0.2Mpa nitrogen from entering the fan housing 20 and reducing the nitrogen loss. The fourth-stage sealing ring 9 in the nitrogen shaft sealing device 1 seals the 0.2Mpa nitrogen, greatly reducing the 0.2Mpa nitrogen from entering the atmosphere and reducing the nitrogen loss.

[0029] The first-stage sealing ring 2 is located 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 material. The first-stage PTFE buffer sheet 14 is glued to the left side of the first-stage sealing ring 2, and the left side of the first-stage PTFE buffer sheet 14 is aligned with the left end face of the shaft seal sleeve 13. The first-stage PTFE buffer sheet 14 in the first-stage sealing ring 2 can offset 80% of the explosive impact force when an explosion occurs in the fan housing 20. The first-stage graphite lining ring 16 is embedded and installed in the bottom inner ring of the first-stage sealing ring 2. 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-lubrication. When the first-stage graphite lining ring 16 and the transmission shaft sleeve 17 rub against each other, friction sparks and hot surfaces are avoided.

[0030] The second-stage sealing ring 3 is installed in the second groove of the shaft seal sleeve 13, and the main body of the second-stage sealing ring 3 is made of PPS material. The second-stage PTFE buffer sheet 15 is glued to the left side of the second-stage sealing ring 3, and the second-stage PTFE buffer sheet 15 in the second-stage sealing ring 3 can offset the remaining 20% ​​of the explosion impact force when an explosion occurs in the fan housing 20. The second-stage graphite lining ring 4 is embedded and installed in the inner ring at the bottom of the second-stage sealing ring 3. The gap between the second-stage graphite lining ring 4 and the transmission shaft sleeve 17 is 0.3mm. The second-stage graphite lining ring 4 has excellent self-lubrication. When the second-stage graphite lining ring 4 and the transmission shaft sleeve 17 rub against each other, friction sparks and hot surfaces are avoided.

[0031] The third-stage sealing ring 5 is installed in the third groove of the shaft seal sleeve 13. The main body of the third-stage sealing ring 5 is made of PPS material. The third-stage graphite lining ring 6 is embedded in the inner ring at the bottom of the third-stage sealing ring 5. The gap between the third-stage graphite lining ring 6 and the transmission sleeve 17 is 0.1mm. The third-stage graphite lining ring 6 has excellent self-lubrication. When the third-stage graphite lining ring 6 and the transmission sleeve 17 rub against each other, friction sparks and hot surfaces are avoided.

[0032] The fourth-stage sealing ring 9 is installed in the fourth groove of the shaft seal sleeve 13. The main body of the fourth-stage sealing ring 9 is made of PPS material. The fourth-stage graphite lining ring 10 is embedded in the inner ring at the bottom of the fourth-stage sealing ring 9. The gap between the fourth-stage graphite lining ring 10 and the transmission sleeve 17 is 0.1mm. The fourth-stage graphite lining ring 10 has excellent self-lubrication. When the fourth-stage graphite lining ring 10 and the transmission sleeve 17 rub against each other, friction sparks and hot surfaces are avoided.

[0033] Use Figure 3 The blower explosion test device shown in the figure is used for explosion-proof test. A pressure sensor 31 is provided on the explosion-proof blower 32, a flame sensor 28 is provided on the gas circulation pipe 25 at the air inlet and outlet of the explosion-proof blower 32, a temperature sensor 27 is provided on the gas circulation pipe 25 at the air inlet of the explosion-proof blower 32, and a flame arrester 22 and a bellows 29 are provided at the air inlet and outlet of the explosion-proof blower 32. An infrared flame sensor 30 is provided on the outside of the explosion-proof blower 32, a spark plug 33 is provided inside the explosion-proof blower 32, and a throttle valve 26 is provided on the gas circulation pipe 25 between the gas inlet valve 23 and the gas outlet valve 24. The gas enters the gas circulation pipe 25 from the gas inlet valve 23, passes through the bellows 29, the flame arrester 22, enters the explosion-proof blower 32, and then passes through the flame arrester 22 and the bellows 29 before being discharged from the gas outlet valve 24. The specific test is as follows:

[0034] Test Example 1:

[0035] Taking the explosion-proof fan 32 in the explosion-free zone as an example, the amount of benzene gas transported by the explosion-proof fan 32 in the explosion-free zone is 1000m3 / h, explosion-proof fan 32 in explosion-free zone has an outlet pressure of 12Kpa.

[0036] The fan impeller diameter is set to 800mm, the explosion-proof motor working power is set to 30KW, and the speed of explosion-proof motor 19 is set to 3000rpm. At this speed, FID technology is used to detect the concentration of benzene gas at the position of nitrogen shaft seal device 1 in real time. Under continuous monitoring for 72 hours, the benzene gas concentration at the position of nitrogen shaft seal device 1 is 0ppm.

[0037] according to Figure 3 The blower explosion test device shown injects a mixture of benzene and air into a gas circulation pipe 25, and installs a blower conveying benzene gas on the blower explosion test device. The blower speed is 3000rpm, and ignites in the blower casing 20 through a spark plug 33. At the moment of ignition, the pressure of the pressure sensor 31 rises to 0.63Mpa, and the temperature sensor 27 in the gas circulation pipe 25 does not detect a temperature rise at the moment of the explosion. The flame sensor 28 in the gas circulation pipe 25 does not detect a flame at the moment of the explosion. The infrared flame sensor 30 at the position of the nitrogen shaft seal device 1 does not detect a flame, indicating that the internal explosion flame of the blower is not transmitted to places outside the blower body. The explosion test of the blower conveying benzene is qualified, proving that the nitrogen shaft seal device 1 in the blower conveying benzene can ensure the safety of the explosion-proof blower 32 conveying benzene gas in the explosion zero zone.

[0038] Test Example 2:

[0039] Taking the explosion-proof fan 32 in the explosion-free zone as an example, the explosion-proof fan 32 in the explosion-free zone can transport 1500m3 of hydrogen sulfide gas. 3 / h, explosion-proof fan 32 in explosion-free zone has an outlet pressure of 10Kpa.

[0040] The fan impeller diameter is set to 850mm, the explosion-proof motor working power is set to 32KW, and the speed of explosion-proof motor 19 is set to 3000rpm. At this speed, the hydrogen sulfide detector detects the concentration of hydrogen sulfide gas at the position of the nitrogen shaft seal device 1 in real time. Under the condition of continuous monitoring for 78 hours, the concentration of hydrogen sulfide gas at the position of the nitrogen shaft seal device 1 is 0ppm.

[0041] according to Figure 3The blower explosion test device shown injects a mixture of hydrogen sulfide gas and air into a gas circulation pipe 25, and installs a blower conveying hydrogen sulfide gas on the blower explosion test device. The blower rotates at a speed of 3000 rpm, and ignites in the blower casing 20 through a spark plug 33. At the moment of ignition, the pressure of the pressure sensor 31 rises to 0.55 MPa. The temperature sensor 27 in the gas circulation pipe 25 does not detect a temperature rise at the moment of the explosion. The flame sensor 28 in the gas circulation pipe 25 does not detect a flame at the moment of the explosion. The infrared flame sensor 30 at the position of the nitrogen shaft seal device 1 does not detect a flame, indicating that the internal explosion flame of the blower is not transmitted to places outside the blower body. The explosion test of the blower conveying hydrogen sulfide gas is qualified, proving that the nitrogen shaft seal device 1 in the blower conveying hydrogen sulfide gas can ensure the safety of the explosion-proof blower conveying hydrogen sulfide gas in the explosion-free zone.

[0042] Test Example 3:

[0043] Taking the explosion-proof fan 32 in the zero explosion zone as an example, the ethylene gas transported by the explosion-proof fan 32 in the zero explosion zone is 1300m 3 / h, explosion-proof fan 32 in explosion-free zone has an outlet pressure of 12Kpa.

[0044] The fan impeller diameter is set to 800mm, the explosion-proof motor working power is set to 31KW, and the speed of explosion-proof motor 19 is set to 3000rpm. At this speed, FID technology is used to detect the concentration of ethylene gas at the position of ethylene gas shaft seal device 1 in real time. Under continuous monitoring for 96 hours, the ethylene gas concentration at the position of nitrogen shaft seal device 1 is 0ppm.

[0045] according to Figure 3 The blower explosion test device shown injects a mixture of ethylene gas and air into a gas circulation pipe 25, and installs a blower conveying ethylene gas on the blower explosion test device. The blower speed is 3000rpm, and ignites in the blower casing 20 through a spark plug 33. At the moment of ignition, the pressure of the pressure sensor 31 rises to 0.75Mpa, and the temperature sensor 27 in the gas circulation pipe 25 does not detect a temperature rise at the moment of the explosion. The flame sensor 28 in the gas circulation pipe 25 does not detect a flame at the moment of the explosion. The infrared flame sensor 30 at the position of the nitrogen shaft seal device 1 does not detect a flame, indicating that the internal explosion flame of the blower is not transmitted to places outside the blower body. The explosion test of the blower conveying ethylene gas is qualified, proving that the nitrogen shaft seal device 1 in the blower conveying ethylene gas can ensure the safety of the explosion-proof blower 32 in the explosion zero zone for conveying ethylene gas.

[0046] Test example 4:

[0047] Taking the explosion-proof fan 32 in the explosion-free zone as an example, the ethylene gas transported by the explosion-proof fan 32 in the explosion-free zone is 1500m 3 / h, explosion-proof fan 32 outlet pressure in explosion-free zone is 8Kpa.

[0048] The fan impeller diameter is set to 850mm, the explosion-proof motor working power is set to 29KW, and the explosion-proof motor speed is set to 3000rpm. At this speed, FID technology is used to detect the concentration of styrene gas at the position of styrene gas shaft seal device 1 in real time. Under continuous monitoring for 76 hours, the styrene gas concentration at the position of nitrogen shaft seal device 1 is 0ppm.

[0049] according to Figure 3 The blower explosion test device shown injects a mixture of styrene gas and air into a gas circulation pipe 25, and installs a blower conveying styrene gas on the blower explosion test device. The blower speed is 3000rpm, and ignites in the blower casing 20 through a spark plug 33. At the moment of ignition, the pressure of the pressure sensor 31 rises to 0.83Mpa, and the temperature sensor 27 in the gas circulation pipe 25 does not detect a temperature rise at the moment of the explosion. The flame sensor 28 in the gas circulation pipe 25 does not detect a flame at the moment of the explosion. The infrared flame sensor 30 at the position of the nitrogen shaft seal device 1 does not detect a flame, indicating that the internal explosion flame of the blower is not transmitted to places outside the blower body. The explosion test of the blower conveying styrene gas is qualified, proving that the nitrogen shaft seal device 1 in the blower conveying styrene gas can ensure the safety of the explosion-proof blower 32 in the explosion zero zone for conveying styrene gas.

[0050] Embodiment 4:

[0051] Taking the explosion-proof fan 32 in the zero explosion zone as an example, the ethylene gas transported by the explosion-proof fan 32 in the zero explosion zone is 1200m 3 / h, explosion-proof fan 32 outlet pressure in explosion-free zone 5Kpa.

[0052] The fan impeller diameter is set to 750mm, the explosion-proof motor working power is set to 18KW, and the speed of the explosion-proof motor 19 is set to 3000rpm. At this speed, FID technology is used to detect the concentration of gasoline and oil gas at the gasoline and oil gas shaft seal device 1 in real time. After 82 hours of continuous monitoring, the gasoline and oil gas concentration at the nitrogen shaft seal device 1 is 0ppm.

[0053] according to Figure 3The blower explosion test device shown injects a mixture of gasoline, oil gas and air into a gas circulation pipe 25, and installs a blower conveying gasoline, oil gas on the blower explosion test device. The blower rotates at a speed of 3000 rpm and is ignited in the blower casing 20 by a spark plug 33. At the moment of ignition, the pressure of the pressure sensor 31 rises to 0.91 MPa. The temperature sensor 27 in the gas circulation pipe 25 does not detect a temperature rise at the moment of the explosion. The flame sensor 28 in the gas circulation pipe 25 does not detect a flame at the moment of the explosion. The infrared flame sensor 30 at the position of the nitrogen shaft seal device 1 does not detect a flame, indicating that the internal explosion flame of the blower is not transmitted to places outside the blower body. The explosion test of the blower conveying gasoline, oil gas is qualified, proving that the nitrogen shaft seal device 1 in the blower conveying gasoline, oil gas can ensure the safety of the explosion-proof blower 32 in the explosion-free zone.

[0054] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An explosion-proof blower nitrogen shaft seal device, comprising a shaft seal sleeve, characterized in that: The inner wall of the shaft sealing sleeve is inlaid with four-stage sealing rings at intervals. The sealing rings are made of PPS material. A graphite lining ring is inlaid and installed on the inner ring at the bottom of each sealing ring. A transmission sleeve for the fan drive shaft to pass through is provided inside the graphite lining ring. There is a cavity between the transmission sleeve and the shaft sealing sleeve; the first-stage PTFE buffer sheet is glued to the left side of the first-stage sealing ring, and the left side surface of the first-stage PTFE buffer sheet is aligned with the left end surface of the shaft sealing sleeve; the second-stage PTFE buffer sheet is glued to the left side of the second-stage sealing ring, and a nitrogen pipe leading to the cavity is installed on the shaft sealing sleeve between the third-stage sealing ring and the fourth-stage sealing ring; bolt holes and O-rings are provided on the left end surface of the shaft sealing sleeve.

2. The nitrogen shaft seal device for explosion-proof blower according to claim 1, characterized in that: The bottom inner ring of the first-stage sealing ring is inlaid with a first-stage graphite lining ring, and the gap between the first-stage graphite lining ring and the transmission shaft sleeve is 0.5 mm.

3. The nitrogen shaft seal device for explosion-proof blower according to claim 1, characterized in that: The bottom inner ring of the second-stage sealing ring is inlaid with a second-stage graphite lining ring, and the gap between the second-stage graphite lining ring and the transmission shaft sleeve is 0.3 mm.

4. The nitrogen shaft seal device for explosion-proof blower according to claim 1, characterized in that: The inner ring at the bottom of the third-stage sealing ring is inlaid with a third-stage graphite lining ring, and the gap between the third-stage graphite lining ring and the transmission shaft sleeve is 0.1 mm.

5. The nitrogen shaft seal device for explosion-proof blower according to claim 1, characterized in that: The inner ring at the bottom of the fourth-stage sealing ring is inlaid with a fourth-stage graphite lining ring, and the gap between the fourth-stage graphite lining ring and the transmission shaft sleeve is 0.1 mm.

6. The nitrogen shaft seal device for explosion-proof blower according to claim 1, characterized in that: The nitrogen pipe is threadedly connected with a nitrogen connector, and the nitrogen connector is connected to a 0.2Mpa nitrogen pipeline.

7. The nitrogen shaft seal device for explosion-proof blower according to claim 1, characterized in that: The diameter of the nitrogen tube is 8 mm.

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