Mechanical seal safety protection system and protection method

Abstract

The present invention discloses a mechanical seal safety protection system, including a transmission shaft, a first sealing unit and a second sealing unit connected to the shaft body of the transmission shaft, a protection unit connected to the side of the second sealing unit away from the first sealing unit, the protection unit connected to the transmission shaft, a sealing assembly connected to the side of the protection unit away from the second sealing unit, and the protection unit is also connected to an emptying and purging unit. The present invention also discloses a protection method for the mechanical seal safety protection system. The present invention utilizes the principle of static sealing to collect and discharge the medium leaked from the mechanical seal to a safe location, effectively solving the problem of uncontrollable medium leakage caused by mechanical seal leakage, solving the environmental pollution problem caused by medium leakage, improving the safe operation coefficient of the transmission equipment, reducing material loss, and improving the economic benefits of the equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical seal leakage protection equipment for chemical production rotating equipment, and in particular relates to a mechanical seal safety protection system and a protection method for the system. Background Art

[0002] Rotating equipment is indispensable in chemical production equipment, and preventing the leakage of liquid or gas in rotating equipment is a serious challenge. Leakage will not only cause material loss, but more importantly, once toxic and harmful materials leak, they will cause great harm to the environment and humans. Therefore, sealing is particularly important in the chemical industry. The main function of sealing is to prevent liquid or gas from leaking out of the moving parts of mechanical equipment, and at the same time prevent dust, moisture and other substances from entering the equipment, thereby ensuring the normal operation of mechanical equipment. The traditional approach is to use packing seals, but packing seals have the disadvantages of poor sealing performance, large radial runout of the shaft, high power consumption, shaft wear, and short service life. The emergence of mechanical seals has solved these problems well. Mechanical seal failure is the last line of defense for leakage. Just like this, mechanical seal leakage in production leaves operators helpless. They can only take emergency pump cutting or pressure relief after cutting materials and wait for the medium to leak completely before repairing. The on-site leakage problem cannot be solved, and the safety and environmental protection problems caused by the leakage cannot be controlled. Summary of the invention

[0003] The purpose of the present invention is to provide a mechanical seal safety protection system to solve the problem of environmental pollution caused by medium leakage due to failure of existing mechanical seals.

[0004] Another object of the present invention is to provide a protection method for a mechanical seal safety protection system.

[0005] The technical solution adopted by the present invention is a mechanical seal safety protection system, including a transmission shaft, the shaft body of the transmission shaft is connected to a first sealing unit and a second sealing unit, the side of the second sealing unit away from the first sealing unit is connected to a protection unit, the protection unit is connected to the transmission shaft, the side of the protection unit away from the second sealing unit is connected to a sealing assembly, and the protection unit is also connected to a venting and purge unit.

[0006] The present invention is also characterized in that: The first sealing unit includes a sleeve, which is sleeved on the shaft body of the transmission shaft. The shaft body of the transmission shaft is also sleeved with a sleeve O-ring. The end of the sleeve away from the sleeve O-ring is connected to the second sealing unit through a connecting assembly.

[0007] The connecting assembly includes a spring arranged in a spring sleeve, two ends of the spring are respectively connected to the shaft sleeve and the second sealing unit, the spring sleeve is sleeved on the shaft sleeve, a sleeve O-ring is connected between the spring sleeve and the shaft sleeve, the sleeve O-ring is arranged away from the second sealing unit, and the spring, spring sleeve and sleeve O-ring are all sleeved on the shaft body of the transmission shaft.

[0008] The second sealing unit includes a pressure cover, which is connected to the transmission shaft. One side of the pressure cover is connected to the protection unit. The side of the pressure cover away from the protection unit is connected to a static ring. A static ring O-ring is arranged between the static ring and the pressure cover. The side of the static ring away from the pressure cover is connected to a dynamic ring. The side of the dynamic ring away from the static ring is connected to a spring and a spring sleeve. The static ring, the dynamic ring, and the static ring O-ring are all sleeved with the transmission shaft.

[0009] The protection unit includes a protective cover, which is connected to a pressure cover. The protective cover is sleeved on a transmission shaft. The end of the sleeve is connected to a driving bolt, which is connected to a positioning locking plate. The driving bolt and the positioning locking plate are both arranged in the protective cover. The side of the protective cover away from the pressure cover is connected to the sealing assembly, and the top of the protective cover is connected to the venting and purge unit.

[0010] The sealing component comprises a static sealing ring, which is connected with the protective cover and sleeved on the transmission shaft.

[0011] The venting and purge unit includes an alarm sensor, which is connected to the inner top surface of the protective cover. The top of the protective cover is connected to an alarm instrument and a pressure gauge. The alarm instrument is connected to the alarm sensor through a pipeline. The top of the protective cover is also connected to a discharge pipe. The body of the discharge pipe is sequentially connected to a third manual valve, a control valve and a fourth manual valve. The fourth manual valve is arranged close to the protective cover. The top of the protective cover is also connected to a purge assembly.

[0012] The purge assembly comprises a nitrogen purge pipe, the nitrogen purge pipe is connected with the protective cover, and the pipe body of the nitrogen purge pipe is connected with a first hand valve and a second hand valve.

[0013] Another technical solution adopted by the present invention is: The protection method of the mechanical seal safety protection system is implemented according to the following steps: Step 1: When the mechanical seal or static ring O-ring fails, the medium leaks into the protective cover; Step 2: The medium in the protective cover triggers the alarm sensor, which sounds an alarm through the alarm instrument. At the same time, the control valve opens and the static sealing ring contracts; Step 3: The medium in the protective cover is discharged to a safe location through a discharge pipe; Step 4. When the pressure indication is zero, open the first hand valve and the second hand valve, and purge the inside of the protective cover through the nitrogen purge pipe. After the purge is completed, close the first hand valve and the second hand valve, and manually reset the static sealing ring.

[0014] The beneficial effects of the present invention are: The mechanical seal safety protection system of the present invention utilizes the principle of static sealing to collect and discharge the medium leaked from the mechanical seal to a safe location, effectively solving the problem of uncontrollable medium leakage caused by mechanical seal leakage, solving the environmental pollution problem caused by medium leakage, improving the safe operation coefficient of the transmission equipment, reducing material loss, and improving the economic benefits of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the mechanical seal safety protection system of the present invention.

[0016] In the figure: 1. sleeve O-ring, 2. sleeve, 3. spring, 4. dynamic ring, 5. static ring, 6. static ring O-ring, 7. transmission shaft, 8. positioning lock plate, 9. static sealing ring, 10. sleeve O-ring, 11. spring sleeve, 12. protective cover, 13. gland, 14. drive bolt, 15. alarm sensor, 16. discharge pipe, 17. nitrogen purge pipe, 18. first hand valve, 19. second hand valve, 20. third hand valve, 21. fourth hand valve, 22. control valve, 23. alarm instrument, 24. pressure gauge. DETAILED DESCRIPTION

[0017] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] The present invention provides a mechanical seal safety protection system, such as Figure 1 As shown, it includes a transmission shaft 7, the shaft body of the transmission shaft 7 is connected with a first sealing unit and a second sealing unit, the second sealing unit is connected with a protection unit on a side away from the first sealing unit, the protection unit is connected to the transmission shaft 7, the protection unit is connected with a sealing assembly on a side away from the second sealing unit, and the protection unit is also connected with a venting and purging unit. The first sealing unit and the second sealing unit serve as mechanical seals for the transmission shaft 7 to prevent leakage of the medium in the transmission shaft 7. When the mechanical seal fails, the medium leaks into the protection unit. The protection unit serves as a closed space to prevent leakage of the medium. The medium in the protection unit is discharged to a safe location through the venting and purging unit, and is disassembled for inspection after the purging is completed. Example 1 The mechanical seal safety protection system includes a transmission shaft 7, the shaft body of the transmission shaft 7 is connected with a first sealing unit and a second sealing unit, the side of the second sealing unit away from the first sealing unit is connected with a protection unit, the protection unit is connected to the transmission shaft 7, the side of the protection unit away from the second sealing unit is connected with a sealing assembly, and the protection unit is also connected with a venting and purge unit.

[0019] The first sealing unit includes a sleeve 2, which is sleeved on the shaft body of the transmission shaft 7. The shaft body of the transmission shaft 7 is also sleeved with a sleeve O-ring 1. The end of the sleeve 2 away from the sleeve O-ring 1 is connected to the second sealing unit through a connecting assembly. The sleeve O-ring 1 prevents leakage of the medium in the transmission shaft 7. The sleeve 2 and the sleeve O-ring 1 rotate as the transmission shaft 7 rotates.

[0020] Example 2 The water mechanical seal safety protection system includes a transmission shaft 7, the shaft body of the transmission shaft 7 is connected with a first sealing unit and a second sealing unit, the second sealing unit is connected with a protection unit on a side away from the first sealing unit, the protection unit is connected to the transmission shaft 7, the protection unit is connected with a sealing assembly on a side away from the second sealing unit, and the protection unit is also connected with a venting and purge unit.

[0021] The first sealing unit includes a sleeve 2, which is sleeved on the shaft body of the transmission shaft 7. The shaft body of the transmission shaft 7 is also sleeved with a sleeve O-ring 1. The end of the sleeve 2 away from the sleeve O-ring 1 is connected to the second sealing unit through a connecting assembly.

[0022] The connection assembly includes a spring 3 disposed in a spring sleeve 11, both ends of the spring 3 are connected to the shaft sleeve 2 and the second sealing unit respectively, the spring sleeve 11 is sleeved on the shaft sleeve 2, a sleeve O-ring 10 is connected between the spring sleeve 11 and the shaft sleeve 2, and the sleeve O-ring 10 is arranged away from the second sealing unit, and the spring 3, the spring sleeve 11 and the sleeve O-ring 10 are all sleeved on the shaft body of the transmission shaft 7. The spring 3, the spring sleeve 11 and the sleeve O-ring 10 rotate as the transmission shaft 7 rotates.

[0023] Example 3 The water mechanical seal safety protection system includes a transmission shaft 7, the shaft body of the transmission shaft 7 is connected with a first sealing unit and a second sealing unit, the second sealing unit is connected with a protection unit on a side away from the first sealing unit, the protection unit is connected to the transmission shaft 7, the protection unit is connected with a sealing assembly on a side away from the second sealing unit, and the protection unit is also connected with a venting and purge unit.

[0024] The first sealing unit includes a sleeve 2, which is sleeved on the shaft body of the transmission shaft 7. The shaft body of the transmission shaft 7 is also sleeved with a sleeve O-ring 1. The end of the sleeve 2 away from the sleeve O-ring 1 is connected to the second sealing unit through a connecting assembly.

[0025] The connecting assembly includes a spring 3 arranged in a spring sleeve 11, both ends of the spring 3 are respectively connected to the shaft sleeve 2 and the second sealing unit, the spring sleeve 3 is sleeved on the shaft sleeve 2, a sleeve O-ring 10 is connected between the spring sleeve 3 and the shaft sleeve 2, the sleeve O-ring 10 is arranged away from the second sealing unit, and the spring 3, the spring sleeve 11 and the sleeve O-ring 10 are all sleeved on the shaft body of the transmission shaft 7.

[0026] The second sealing unit includes a gland 13, which is connected to the transmission shaft 7, one side of the gland 13 is connected to the protection unit, the side of the gland 13 away from the protection unit is connected to the static ring 5, a static ring O-ring 6 is arranged between the static ring 5 and the gland 13, the side of the static ring 5 away from the gland 13 is connected to the dynamic ring 4, the side of the dynamic ring 4 away from the static ring 5 is connected to the spring 3 and the spring sleeve 11, and the static ring 5, the dynamic ring 4, and the static ring O-ring 6 are all sleeved with the transmission shaft 7. The dynamic ring 4 rotates with the rotation of the transmission shaft 7, and the static ring 5, the static ring O-ring 6 and the gland 13 do not rotate with the transmission shaft 7.

[0027] Example 4 The water mechanical seal safety protection system includes a transmission shaft 7, the shaft body of the transmission shaft 7 is connected with a first sealing unit and a second sealing unit, the second sealing unit is connected with a protection unit on a side away from the first sealing unit, the protection unit is connected to the transmission shaft 7, the protection unit is connected with a sealing assembly on a side away from the second sealing unit, and the protection unit is also connected with a venting and purge unit.

[0028] The first sealing unit includes a sleeve 2, which is sleeved on the shaft body of the transmission shaft 7. The shaft body of the transmission shaft 7 is also sleeved with a sleeve O-ring 1. The end of the sleeve 2 away from the sleeve O-ring 1 is connected to the second sealing unit through a connecting assembly.

[0029] The connecting assembly includes a spring 3 arranged in a spring sleeve 11, both ends of the spring 3 are respectively connected to the shaft sleeve 2 and the second sealing unit, the spring sleeve 3 is sleeved on the shaft sleeve 2, a sleeve O-ring 10 is connected between the spring sleeve 3 and the shaft sleeve 2, the sleeve O-ring 10 is arranged away from the second sealing unit, and the spring 3, the spring sleeve 11 and the sleeve O-ring 10 are all sleeved on the shaft body of the transmission shaft 7.

[0030] The second sealing unit includes a pressure cover 13, which is connected to the transmission shaft 7. One side of the pressure cover 13 is connected to the protection unit. The side of the pressure cover 13 away from the protection unit is connected to the stationary ring 5. A stationary ring O-ring 6 is arranged between the stationary ring 5 and the pressure cover 13. The side of the stationary ring 5 away from the pressure cover 13 is connected to the dynamic ring 4. The side of the dynamic ring 4 away from the stationary ring 5 is connected to the spring 3 and the spring sleeve 11. The stationary ring 5, the dynamic ring 4, and the stationary ring O-ring 6 are all sleeved with the transmission shaft 7.

[0031] The protection unit includes a protective cover 12, which is connected to a gland 13. The protective cover 12 is sleeved on the transmission shaft 7. The end of the sleeve 2 is connected to a driving bolt 14, which is connected to a positioning lock plate 8. The driving bolt 14 and the positioning lock plate 8 are both arranged in the protective cover 12. The side of the protective cover 12 away from the gland 13 is connected to the sealing assembly, and the top of the protective cover 12 is connected to the venting and purging unit. During the movement of the transmission shaft 7, the driving bolt 14 is separated from the sleeve 2. When the medium leaks and needs to be repaired, the driving bolt 14 is locked with the sleeve 2, and the positioning lock plate 8 is locked to prevent axial and radial displacement. When the mechanical seal fails, the medium leaks into the protective cover 12. The protective cover 12 serves as a closed space to prevent the leaked medium from polluting the environment.

[0032] The sealing assembly includes a static sealing ring 9, which is connected to a protective cover 12 and sleeved on the transmission shaft 7. When the medium leaks into the protective cover 12, the static sealing ring 9 contracts and seals the transmission shaft 7 to prevent the medium from leaking from the gap between the static sealing ring 9 and the transmission shaft 7. When the inspection is completed, the static sealing ring 9 can be manually reset.

[0033] Example 5 The water mechanical seal safety protection system includes a transmission shaft 7, the shaft body of the transmission shaft 7 is connected with a first sealing unit and a second sealing unit, the second sealing unit is connected with a protection unit on a side away from the first sealing unit, the protection unit is connected to the transmission shaft 7, the protection unit is connected with a sealing assembly on a side away from the second sealing unit, and the protection unit is also connected with a venting and purge unit.

[0034] The first sealing unit includes a sleeve 2, which is sleeved on the shaft body of the transmission shaft 7. The shaft body of the transmission shaft 7 is also sleeved with a sleeve O-ring 1. The end of the sleeve 2 away from the sleeve O-ring 1 is connected to the second sealing unit through a connecting assembly.

[0035] The connecting assembly includes a spring 3 arranged in a spring sleeve 11, both ends of the spring 3 are respectively connected to the shaft sleeve 2 and the second sealing unit, the spring sleeve 3 is sleeved on the shaft sleeve 2, a sleeve O-ring 10 is connected between the spring sleeve 3 and the shaft sleeve 2, the sleeve O-ring 10 is arranged away from the second sealing unit, and the spring 3, the spring sleeve 11 and the sleeve O-ring 10 are all sleeved on the shaft body of the transmission shaft 7.

[0036] The second sealing unit includes a pressure cover 13, which is connected to the transmission shaft 7. One side of the pressure cover 13 is connected to the protection unit. The side of the pressure cover 13 away from the protection unit is connected to the stationary ring 5. A stationary ring O-ring 6 is arranged between the stationary ring 5 and the pressure cover 13. The side of the stationary ring 5 away from the pressure cover 13 is connected to the dynamic ring 4. The side of the dynamic ring 4 away from the stationary ring 5 is connected to the spring 3 and the spring sleeve 11. The stationary ring 5, the dynamic ring 4, and the stationary ring O-ring 6 are all sleeved with the transmission shaft 7.

[0037] The protection unit includes a protection cover 12, which is connected to a gland 13, and the protection cover 12 is sleeved on the transmission shaft 7. The transmission shaft 7 is connected to a driving bolt 14, and the driving bolt 14 is connected to a positioning lock plate 8. The driving bolt 14 and the positioning lock plate 8 are both arranged in the protection cover 12. The side of the protection cover 12 away from the gland 13 is connected to the sealing assembly, and the top of the protection cover 12 is connected to the venting and purge unit. When the mechanical seal fails, the medium leaks into the protection cover 12, and the protection cover 12 serves as a closed space to prevent the leaked medium from polluting the environment.

[0038] The sealing assembly includes a static sealing ring 9 , which is connected to the protective cover 12 and sleeved on the transmission shaft 7 .

[0039] The venting and purging unit includes an alarm sensor 15, which is connected to the inner top surface of the protective cover 12. The top of the protective cover is connected with an alarm instrument 23 and a pressure gauge 24. The alarm instrument 23 is connected to the alarm sensor 15 through a pipeline. The top of the protective cover 12 is also connected with a discharge pipe 16. The pipe body of the discharge pipe 16 is sequentially connected with a third hand valve 20, a control valve 22 and a fourth hand valve 21. The fourth hand valve 21 is arranged close to the protective cover 12. The top of the protective cover 12 is also connected with a purge assembly. The third hand valve 20 and the fourth hand valve 21 are in a normally open state. When the medium leaks into the protective cover 12, the alarm sensor 15 senses and triggers the alarm instrument 23 to alarm. The alarm sensor 15 is connected with a control system through a pipeline, and the sensing signal is transmitted to the control system. The control system controls the control valve 22 to open, and at the same time drives the static seal ring 9 to shrink by controlling the thruster, and the medium is discharged from the discharge pipe 16 to a safe position. After the medium is released, nitrogen purge and replacement are performed through the purge assembly until the safety disassembly standard is met.

[0040] The purge assembly includes a nitrogen purge pipe 17, which is connected to the protective cover 12. The pipe body of the nitrogen purge pipe 17 is connected to a first hand valve 18 and a second hand valve 19. When performing the purge operation, the first hand valve 18 and the second hand valve 19 are opened, and nitrogen enters the protective cover 12 from the nitrogen purge pipe 17 and is then discharged from the discharge pipe 16. After the purge is completed, the first hand valve 18 and the second hand valve 19 are closed. When the pressure gauge 24 shows zero, the control valve 22 is closed, and the static seal ring 9 is manually reset, and then the maintenance operation is performed.

[0041] Example 6 The protection method of the mechanical seal safety protection system of the present invention is specifically implemented according to the following steps: Step 1: When the mechanical seal or the static ring O-ring 6 fails, the medium leaks into the protective cover 12; Step 2: The medium in the protective cover 12 triggers the alarm sensor 15, and the alarm is sounded through the alarm device 23. At the same time, the control valve 22 is opened, and the static sealing ring 9 is contracted; Step 3, the medium in the protective cover 12 is discharged to a safe location through the discharge pipe 16; Step 4, when the pressure gauge 24 shows zero, open the first hand valve 18 and the second hand valve 19, and purge the inside of the protective cover 12 through the nitrogen purge pipe 17. After the purge is completed, close the first hand valve 18 and the second hand valve 19, and manually reset the static sealing ring 9.

[0042] The working process of the mechanical seal safety protection system of the present invention is as follows: When the mechanical seal fails or the static ring O-ring 6 fails and causes the medium to leak, the leaked medium causes the alarm sensor 15 to alarm and then triggers the alarm instrument 23 to trigger the alarm action, the control valve 22 is opened and the static seal ring 9 shrinks to seal the transmission shaft 7, forming a closed space, the third hand valve 20 and the fourth hand valve 21 are in the FO state (normally open), and the leaked medium is discharged to the safe collection position through the discharge pipe 16 after the interlock is triggered. After the medium is released, observe the reading of the pressure gauge 25. When the pressure is zero, manually open the first hand valve 18 and the second hand valve 19, introduce the nitrogen from the nitrogen purge pipe 17 into the protective cover 12, purge and replace the inside thereof, and after meeting the standard for safe disassembly, manually close the first hand valve 18 and the second hand valve 19, close the control valve 22, and manually reset the static seal ring 9, effectively solving the problem of uncontrollable medium leakage caused by mechanical seal leakage and the problem of environmental pollution caused by medium leakage.

[0043] The mechanical seal safety protection system of the present invention establishes an external enclosed space and utilizes the principle of static sealing to collect and discharge the medium leaked from the mechanical seal to a safe location, effectively solving the problem of uncontrollable medium leakage caused by mechanical seal leakage, solving the environmental pollution problem caused by medium leakage, and improving the safe operation coefficient of the transmission equipment. The discharged medium is collected in a safe location and can be reused, reducing material loss and improving the economic benefits of the equipment.

Claims

1. Mechanical seal safety protection system, characterized in that: The invention comprises a transmission shaft (7), wherein the shaft body of the transmission shaft (7) is connected to a first sealing unit and a second sealing unit, a side of the second sealing unit away from the first sealing unit is connected to a protection unit, the protection unit is connected to the transmission shaft (7), a side of the protection unit away from the second sealing unit is connected to a sealing assembly, and the protection unit is also connected to an air venting and purge unit.

2. The mechanical seal safety protection system according to claim 1, characterized in that: The first sealing unit comprises a shaft sleeve (2), the shaft sleeve (2) being sleeved on the shaft body of the transmission shaft (7), the shaft body of the transmission shaft (7) being further sleeved with a shaft sleeve O-ring (1), and an end of the shaft sleeve (2) away from the shaft sleeve O-ring (1) being connected to the second sealing unit via a connecting assembly.

3. The mechanical seal safety protection system according to claim 2, characterized in that: The connection assembly comprises a spring (3) arranged in a spring sleeve (11), the two ends of the spring (3) being respectively connected to the shaft sleeve (2) and the second sealing unit, the spring sleeve (11) being sleeved on the shaft sleeve (2), a sleeve O-ring (10) being connected between the spring sleeve (11) and the shaft sleeve (2), the sleeve O-ring (10) being arranged away from the second sealing unit, and the spring (3), the spring sleeve (11) and the sleeve O-ring (10) being sleeved on the shaft body of the transmission shaft (7).

4. The mechanical seal safety protection system according to claim 3, characterized in that: The second sealing unit comprises a gland (13), the gland (13) being connected to the transmission shaft (7), one side of the gland (13) being connected to the protection unit, the side of the gland (13) away from the protection unit being connected to a stationary ring (5), a stationary ring O-ring (6) being arranged between the stationary ring (5) and the gland (13), the side of the stationary ring (5) away from the gland (13) being connected to a moving ring (4), the side of the moving ring (4) away from the stationary ring (5) being connected to a spring (3) and a spring sleeve (11), and the stationary ring (5), the moving ring (4), and the stationary ring O-ring (6) being all sleeved with the transmission shaft (7).

5. The mechanical seal safety protection system according to claim 4, characterized in that: The protection unit comprises a protection cover (12), wherein the protection cover (12) is connected to a gland (13), the protection cover (12) is sleeved on a transmission shaft (7), an end of the shaft sleeve (2) is connected to a driving bolt (14), the driving bolt (14) is connected to a positioning locking plate (8), the driving bolt (14) and the positioning locking plate (8) are both arranged in the protection cover (12), a side of the protection cover (12) away from the gland (13) is connected to a sealing assembly, and a top of the protection cover (12) is connected to a venting and purge unit.

6. The mechanical seal safety protection system according to claim 5, characterized in that: The sealing assembly comprises a static sealing ring (9), the static sealing ring (9) is connected to the protective cover (12), and the static sealing ring (9) is sleeved on the transmission shaft (7).

7. The mechanical seal safety protection system according to claim 5, characterized in that: The venting and purging unit comprises an alarm sensor (15), wherein the alarm sensor (15) is connected to the inner top surface of the protective cover (12), and the top of the protective cover is connected to an alarm instrument (23) and a pressure gauge (24), wherein the alarm instrument (23) is connected to the alarm sensor (15) via a pipeline, and the top of the protective cover (12) is also connected to a discharge pipe (16), and the pipe body of the discharge pipe (16) is sequentially connected to a third manual valve (20), a control valve (22) and a fourth manual valve (21), wherein the fourth manual valve (21) is arranged close to the protective cover (12), and the top of the protective cover (12) is also connected to a purge assembly.

8. The mechanical seal safety protection system according to claim 7, characterized in that: The purge assembly comprises a nitrogen purge pipe (17), the nitrogen purge pipe (17) is connected to the protective cover (12), and the pipe body of the nitrogen purge pipe (17) is connected to a first hand valve (18) and a second hand valve (19).

9. The protection method of the mechanical seal safety protection system according to any one of claims 1 to 8, characterized in that: Follow the steps below to implement it: Step 1: When the mechanical seal or the stationary ring O-ring (6) fails, the medium leaks into the protective cover (12); Step 2, the medium in the protective cover (12) triggers the alarm sensor (15), which sounds an alarm through the alarm device (23), and at the same time the control valve (22) opens and the static sealing ring (9) contracts; Step 3, the medium in the protective cover (12) is discharged to a safe location through the discharge pipe (16); Step 4: When the pressure gauge (24) shows zero, open the first hand valve (18) and the second hand valve (19), and purge the inside of the protective cover (12) through the nitrogen purge pipe (17). After the purge is completed, close the first hand valve (18) and the second hand valve (19), and manually reset the static sealing ring (9).

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