Mechanical seal safety protection system

Abstract

The utility model discloses a mechanical seal safety protection system which comprises a transmission shaft, a shaft body of the transmission shaft is connected with a first sealing unit and a second sealing unit, the side, away from the first sealing unit, of the second sealing unit is connected with a protection unit, and the protection unit is connected with the transmission shaft. The side, away from the second sealing unit, of the protection unit is connected with a sealing assembly, and the protection unit is further connected with an emptying and purging unit. According to the static seal principle, media leaked by the mechanical seal are collected and discharged to a safe position, the problem of uncontrollable medium leakage caused by mechanical seal leakage is effectively solved, the problem of environmental pollution caused by medium leakage is solved, the safe operation coefficient of transmission equipment is improved, material loss is reduced, and the service life of the transmission equipment is prolonged. The economic benefit of equipment is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to chemical production rotating equipment mechanical seal leakage protection equipment technical field, specifically relates to mechanical seal safety protection system. BACKGROUND

[0002] Rotating equipment is indispensable in chemical production equipment, and preventing liquid or gas leakage in rotating equipment is a serious challenge. Leakage not only causes material loss, but more importantly, once toxic and harmful materials leak, they will cause great harm to the environment and human beings. 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 also to prevent dust, moisture and other substances from the outside from entering the equipment, thereby ensuring the normal operation of mechanical equipment. The traditional method is to use packing seal, but packing seal has the disadvantages of poor sealing performance, shaft cannot have large radial jump, high power consumption, shaft wear, short service life and the like. The emergence of mechanical seal solves these problems well. Mechanical seal failure is the last line of defense against leakage, and exactly so, mechanical seal leakage in production leaves operators helpless, and the scene can only take emergency pump cutting or cutting after pressure relief to wait for the medium to leak completely before maintenance. The leakage problem cannot be solved on site, and the safety and environmental protection problems caused by leakage cannot be controlled. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at providing mechanical seal safety protection system, and solves the problem of medium leakage caused by existing mechanical seal failure to pollute the environment.

[0004] The utility model adopts the technical scheme, mechanical seal safety protection system, including transmission shaft, the shaft body of transmission shaft is connected with first seal unit and second seal unit, the side that second seal unit is away from first seal unit is connected with protection unit, protection unit is connected with transmission shaft, the side that protection unit is away from second seal unit is connected with seal assembly, protection unit is connected with emptying and purging unit still.

[0005] The utility model has the characteristics that:

[0006] First seal unit includes shaft sleeve, and the shaft sleeve is sleeved on the shaft body of the transmission shaft, and the shaft body of the transmission shaft is also sleeved with a shaft sleeve O-ring, and one end of the shaft sleeve away from the shaft sleeve O-ring is connected with the second seal unit through a connecting assembly.

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

[0008] The second sealing unit includes a gland, which is connected to the drive shaft. One side of the gland is connected to the protective unit. A stationary ring is connected to the side of the gland away from the protective unit. A stationary ring O-ring is provided between the stationary ring and the gland. A rotating ring is connected to the side of the stationary ring away from the gland. The side of the rotating ring away from the stationary ring is connected to a spring and a spring sleeve. The stationary ring, the rotating ring, and the stationary ring O-ring are all sleeved on the drive shaft.

[0009] The protective unit includes a protective cover, which is connected to the gland. The protective cover is fitted onto the drive shaft. The end of the shaft sleeve is connected to a drive bolt, which is connected to a positioning locking plate. Both the drive bolt and the positioning locking plate are located inside the protective cover. The side of the protective cover away from the gland is connected to the sealing assembly, and the top of the protective cover is connected to the venting and purging unit.

[0010] The sealing assembly includes a static seal ring, which is connected to the protective cover and is fitted onto the drive shaft.

[0011] The venting and purging unit includes an alarm sensor connected to the inner top surface of the protective cover. An alarm and a pressure gauge are connected to the top of the protective cover. The alarm is connected to the alarm sensor via a pipeline. A discharge pipe is also connected to the top of the protective cover. A third hand valve, a control valve, and a fourth hand valve are connected sequentially to the body of the discharge pipe. The fourth hand valve is located close to the protective cover. A purging assembly is also connected to the top of the protective cover.

[0012] The purging assembly includes a nitrogen purging pipe, which is connected to a protective cover. The pipe body of the nitrogen purging pipe is connected to a first hand valve and a second hand valve.

[0013] The beneficial effects of this utility model are:

[0014] This utility model mechanical seal safety protection system utilizes the principle of static sealing to collect and discharge leaked media from the mechanical seal to a safe location. It effectively solves the problem of uncontrollable media leakage caused by mechanical seal leakage, eliminates the environmental pollution caused by media leakage, improves the safety operation coefficient of transmission equipment, reduces material loss, and improves the economic efficiency of equipment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the mechanical seal safety protection system of this utility model.

[0016] In the figure: 1. Shaft sleeve O-ring, 2. Shaft sleeve, 3. Spring, 4. Moving 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. Cover, 14. Drive bolt, 15. Alarm inductor, 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 utility model is described in detail below in combination with the drawings and specific embodiments.

[0018] Embodiment 1

[0019] The utility model provides a mechanical seal safety protection system, as shown in the figure, including transmission shaft 7, the axle body of transmission shaft 7 is connected with first sealing unit and second sealing unit, the side that second sealing unit is away from first sealing unit is connected with protection unit, and protection unit is connected with transmission shaft 7, and the side that protection unit is away from second sealing unit is connected with sealing assembly, and protection unit is also connected with emptying and purging unit. Figure 1 First sealing unit and second sealing unit are mechanical seals of transmission shaft 7, prevent the medium leakage in transmission shaft 7, when mechanical seal fails, medium leaks to protection unit, and protection unit is as a closed space, prevents the medium excretion, and through emptying and purging unit, the medium in protection unit is discharged to safe position, and after purging is completed, again dismounts and overhauls,

[0020] Embodiment 2

[0021] The utility model provides a mechanical seal safety protection system, as shown in the figure, including transmission shaft 7, the axle body of transmission shaft 7 is connected with first sealing unit and second sealing unit, the side that second sealing unit is away from first sealing unit is connected with protection unit, and protection unit is connected with transmission shaft 7, and the side that protection unit is away from second sealing unit is connected with sealing assembly, and protection unit is also connected with emptying and purging unit.

[0022] First sealing unit includes shaft sleeve 2, and shaft sleeve 2 is sleeved on the axle body of transmission shaft 7, and the axle body of transmission shaft 7 is also sleeved with shaft sleeve O-ring 1, and one end of shaft sleeve 2 is connected with second sealing unit through connecting assembly away from shaft sleeve O-ring 1.

[0023] Embodiment 3

[0024] The water mechanical seal safety protection system comprises 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, away from the first sealing unit, of the second sealing unit is connected with a protection unit, the protection unit is connected with the transmission shaft 7, the side, away from the second sealing unit, of the protection unit is connected with a sealing assembly, and the protection unit is further connected with a venting and purging unit.

[0025] The first sealing unit comprises a shaft sleeve 2, the shaft sleeve 2 is sleeved on the shaft body of the transmission shaft 7, the shaft body of the transmission shaft 7 is further sleeved with a shaft sleeve O-ring 1, and the end, away from the shaft sleeve O-ring 1, of the shaft sleeve 2 is connected with the second sealing unit through a connecting assembly.

[0026] The connecting assembly comprises a spring 3 arranged in a spring sleeve 11, the two ends of the spring 3 are respectively connected with the shaft sleeve 2 and the second sealing unit, 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, 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.

[0027] Embodiment 4

[0028] The water mechanical seal safety protection system comprises 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, away from the first sealing unit, of the second sealing unit is connected with a protection unit, the protection unit is connected with the transmission shaft 7, the side, away from the second sealing unit, of the protection unit is connected with a sealing assembly, and the protection unit is further connected with a venting and purging unit.

[0029] The first sealing unit comprises a shaft sleeve 2, the shaft sleeve 2 is sleeved on the shaft body of the transmission shaft 7, the shaft body of the transmission shaft 7 is further sleeved with a shaft sleeve O-ring 1, and the end, away from the shaft sleeve O-ring 1, of the shaft sleeve 2 is connected with the second sealing unit through a connecting assembly.

[0030] The connecting assembly comprises a spring 3 arranged in a spring sleeve 11, the two ends of the spring 3 are respectively connected with 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.

[0031] The second sealing unit comprises a gland 13 connected with the transmission shaft 7, one side of the gland 13 is connected with the protection unit, the side of the gland 13 away from the protection unit is connected with a 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 with a dynamic ring 4, the side of the dynamic ring 4 away from the static ring 5 is connected with 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 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.

[0032] Embodiment 5

[0033] The water mechanical seal safety protection system comprises 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 with 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 purging unit.

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

[0035] The connecting assembly comprises a spring 3 arranged in the spring sleeve 11, both ends of the spring 3 are connected with the shaft sleeve 2 and the second sealing unit respectively, the spring sleeve 3 is sleeved with 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 with the shaft body of the transmission shaft 7.

[0036] The second sealing unit comprises a gland 13 connected with the transmission shaft 7, one side of the gland 13 is connected with the protection unit, the side of the gland 13 away from the protection unit is connected with a 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 with a dynamic ring 4, the side of the dynamic ring 4 away from the static ring 5 is connected with 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 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.

[0037] The protection unit comprises a protection cover 12 connected with a gland 13, the protection cover 12 is sleeved on the transmission shaft 7, the end of the shaft sleeve 2 is connected with a driving bolt 14, the driving bolt 14 is connected with a positioning lock plate 8, the driving bolt 14 and the positioning lock plate 8 are arranged in the protection cover 12, the side of the protection cover 12 away from the gland 13 is connected with a sealing assembly, and the top of the protection cover 12 is connected with a venting and purging unit. During the movement of the transmission shaft 7, the driving bolt 14 is separated from the shaft sleeve 2, when the medium leakage needs to be overhauled, the driving bolt 14 is locked with the shaft sleeve 2, the positioning lock plate 8 is locked, and the axial and radial displacement is prevented, when the mechanical seal fails, the medium leaks into the protection cover 12, the protection cover 12 is a closed space, and the leaked medium is prevented from polluting the environment.

[0038] The sealing assembly comprises a static seal ring 9 connected with the protection cover 12, and the static seal ring 9 is sleeved on the transmission shaft 7. When the medium leaks into the protection cover 12, the static seal ring 9 is contracted to seal the transmission shaft 7, so that the medium is prevented from leaking from the gap between the static seal ring 9 and the transmission shaft 7, and after the overhaul is completed, the static seal ring 9 can be manually reset.

[0039] Embodiment 6

[0040] The water mechanical seal safety protection system comprises 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 with 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 further connected with a venting and purging unit.

[0041] The first sealing unit comprises a shaft sleeve 2, the shaft sleeve 2 is sleeved on the shaft body of the transmission shaft 7, the shaft body of the transmission shaft 7 is further sleeved with a shaft O-ring 1, and the end of the shaft sleeve 2 away from the shaft O-ring 1 is connected with the second sealing unit through a connecting assembly.

[0042] The connecting assembly comprises a spring 3 arranged in a spring sleeve 11, the two ends of the spring 3 are connected with the shaft sleeve 2 and the second sealing unit respectively, the spring sleeve 3 is sleeved on the shaft sleeve 2, the spring sleeve 3 is connected with the shaft sleeve 2 through a sleeve O-ring 10, 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.

[0043] The second sealing unit comprises a gland 13, the gland 13 is connected with the transmission shaft 7, one side of the gland 13 is connected with the protection unit, the side of the gland 13 away from the protection unit is connected with a 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 with a dynamic ring 4, the side of the dynamic ring 4 away from the static ring 5 is connected with 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 on the transmission shaft 7.

[0044] The protection unit comprises a protection cover 12 connected with a gland 13, the protection cover 12 is sleeved on the transmission shaft 7, a driving bolt 14 is connected with the transmission shaft 7, a positioning lock plate 8 is connected with the driving bolt 14, the driving bolt 14 and the positioning lock plate 8 are arranged in the protection cover 12, one side of the protection cover 12 away from the gland 13 is connected with a sealing assembly, and the top of the protection cover 12 is connected with a venting and purging unit.

[0045] The sealing assembly comprises a static sealing ring 9, the static sealing ring 9 is connected with the protection cover 12, and the static sealing ring 9 is sleeved on the transmission shaft 7.

[0046] The venting and purging unit comprises an alarm sensor 15, the alarm sensor 15 is connected to the inner top surface of the protection cover 12, the top of the protection cover is connected with an alarm instrument 23 and a pressure gauge 24, the alarm instrument 23 is connected with the alarm sensor 15 through a pipeline, the top of the protection 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 protection cover 12, and the top of the protection cover 12 is also connected with a purging assembly. The third hand valve 20 and the fourth hand valve 21 are in a normally open state, when medium leaks into the protection cover 12, the alarm sensor 15 senses, triggers the alarm instrument 23 to alarm, the alarm sensor 15 is connected with a control system through a pipeline, transmits the sensing signal to the control system, the control system controls the control valve 22 to open, and simultaneously drives the static sealing ring 9 to shrink through a control propeller, the medium is discharged to a safe position from the discharge pipe 16, after the medium is completely released, nitrogen is purged and replaced through the purging assembly until a safe dismounting standard is reached.

[0047] The purging assembly comprises a nitrogen purging pipe 17, the nitrogen purging pipe 17 is connected with the protection cover 12, and the pipe body of the nitrogen purging pipe 17 is connected with a first hand valve 18 and a second hand valve 19. When purging operation is carried out, the first hand valve 18 and the second hand valve 19 are opened, nitrogen enters the protection cover 12 from the nitrogen purging pipe 17 and is discharged from the discharge pipe 16, after purging 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, the static sealing ring 9 is manually reset, and then maintenance operation is carried out.

[0048] The working process of the mechanical seal safety protection system is as follows:

[0049] When the medium leaks out due to mechanical seal failure or static ring O-ring 6 failure, the leaked medium causes the alarm sensor 15 to alarm and further triggers the alarm instrument 23 to cause an alarm action, which opens the control valve 22 and shrinks the static seal ring 9 to seal the transmission shaft 7, forms a closed space, the third hand valve 20 and the fourth hand valve 21 are in FO state (normally open), after the interlocking trigger, the leaked medium is discharged to the safe collection position through the discharge pipe 16, after the medium is released, the pressure gauge 25 is observed, when the pressure is zero, the first hand valve 18 and the second hand valve 19 are manually opened, the nitrogen in the nitrogen purging pipe 17 is introduced into the protective cover 12 to purge and replace the inside, after reaching the standard of safe disassembly, the first hand valve 18 and the second hand valve 19 are manually closed, the control valve 22 is closed, and the static seal ring 9 is manually reset, effectively solving the uncontrollable medium leakage problem caused by mechanical seal leakage, and solving the environmental pollution problem caused by medium leakage.

[0050] The utility model discloses a mechanical seal safety protection system, adopt to establish external closed space, utilize the principle of static seal, collect and discharge the medium of mechanical seal leakage to the safe position, effectively solved the uncontrollable medium leakage problem caused by mechanical seal leakage, solved the environmental pollution problem caused by medium leakage, improved the transmission equipment safety operation coefficient, and the medium of external discharge collection can be repeatedly used in the safe position, reduced material loss, improved equipment economic benefits.

Claims

1. A mechanical seal safety guard system characterized by, The application relates to a sealing device for a transmission shaft (7), which comprises a first sealing unit and a second sealing unit connected to the shaft body of the transmission shaft (7), a protection unit connected to the side of the second sealing unit away from the first sealing unit, the protection unit being connected to the transmission shaft (7), a sealing assembly connected to the side of the protection unit away from the second sealing unit, and a venting and purging unit connected to the protection unit.

2. The mechanical seal safety guard system of claim 1, wherein, The first sealing unit comprises a shaft sleeve (2) sleeved on the shaft body of the transmission shaft (7), and the shaft body of the transmission shaft (7) is also sleeved with a shaft sleeve O-ring (1), and the end of the shaft sleeve (2) away from the shaft sleeve O-ring (1) is connected to the second sealing unit through a connecting assembly.

3. The mechanical seal safety shield system of claim 2, wherein, The connecting assembly comprises a spring (3) arranged in a spring sleeve (11), the two ends of the spring (3) being connected to the shaft sleeve (2) and the second sealing unit respectively, the spring sleeve (11) being sleeved on the shaft sleeve (2), and a sleeve O-ring (10) being arranged 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) all being sleeved on the shaft body of the transmission shaft (7).

4. The mechanical seal safety shield system of claim 3, wherein, The second sealing unit comprises a gland (13) connected to the transmission shaft (7), the side of the gland (13) connected to the protection unit, a static ring (5) connected to the side of the gland (13) away from the protection unit, a static ring O-ring (6) arranged between the static ring (5) and the gland (13), a dynamic ring (4) connected to the side of the static ring (5) away from the gland (13), and the side of the dynamic ring (4) away from the static ring (5) being 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) all being sleeved on the transmission shaft (7).

5. The mechanical seal safety shield system of claim 4, wherein, The protection unit comprises a protection cover (12) connected to the gland (13), the protection cover (12) being sleeved on the transmission shaft (7), the end of the shaft sleeve (2) being connected to a driving bolt (14), the driving bolt (14) being connected to a positioning lock plate (8), the driving bolt (14) and the positioning lock plate (8) being arranged in the protection cover (12), the side of the protection cover (12) away from the gland (13) being connected to the sealing assembly, and the top of the protection cover (12) being connected to the venting and purging unit.

6. The mechanical seal safety shield system of claim 5, wherein, The sealing assembly comprises a static sealing ring (9) connected to the protection cover (12) and sleeved on the transmission shaft (7).

7. The mechanical seal safety shield system of claim 5, wherein, The venting and purging unit comprises an alarm sensor (15) 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 with 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), and the top of the protective cover (12) is also connected with a purging assembly.

8. The mechanical seal safety shield system of claim 7, wherein, The purging assembly comprises a nitrogen purging pipe (17) connected with the protective cover (12), and the pipe body of the nitrogen purging pipe (17) is connected with a first hand valve (18) and a second hand valve (19).

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