Packing for petrochemical use

Abstract

The utility model provides a kind of packing type mechanical seal for petrochemical, including stirring shaft, shaft sleeve, the shaft sleeve is sleeved and is fixed on the outer wall of stirring shaft, and the outer wall of shaft sleeve is fixedly connected with fixed sleeve, the outside of the fixed sleeve is provided with flush sleeve, the side wall of the flush sleeve is provided with outer gland, the first static ring is connected on the outer gland, the side wall of the fixed sleeve is slidably connected with the first dynamic ring for the side wall of first static ring, the first elastic piece is connected between the first dynamic ring and fixed sleeve, the side of the first dynamic ring towards flush sleeve is equipped with first inclined plane, the side of the first static ring towards flush sleeve is equipped with second inclined plane, flush hole is equipped on the flush sleeve, and the opening of flush hole is between first static ring and first dynamic ring, to reach the purpose of convenient cleaning heat dissipation cavity.

Description

Technical Field

[0001] This utility model relates to sealing structures, and in particular, to a containerized mechanical seal for petrochemical applications. Background Technology

[0002] Currently, Chinese patent CN222732111U discloses a mechanical seal suitable for high-speed applications. This mechanical seal includes a stationary support and a stationary ring fixed to the stationary support. A rotating ring abuts against the side wall of the stationary ring. A first support is provided on the outer wall of the rotating ring. A rubber bellows is connected to the side of the rotating ring facing away from the stationary ring. A first heat dissipation slope is formed on the rotating ring, and a second heat dissipation slope is formed on the rubber bellows. The first and second heat dissipation slopes are arranged opposite each other to form a heat dissipation cavity. Furthermore, the rotating ring has a protrusion on the side facing the rubber bellows, and the rubber bellows has a recess on the side facing the rotating ring for placing the protrusion. A channel exists between the protrusion and the recess, and this channel communicates with the heat dissipation cavity, aiming to improve heat dissipation performance.

[0003] However, in practical applications, especially when the aforementioned mechanical seal is used in a mixer, liquid inside the mixer may enter the heat dissipation chamber along the gap between the rubber bellows and the mixing shaft. After the mixing operation is completed, the residue in the heat dissipation chamber needs to be cleaned. In the prior art, cleaning the heat dissipation chamber usually requires removing the rubber bellows from the mixing shaft, which is a cumbersome process. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a containerized mechanical seal for petrochemical applications, so as to facilitate the cleaning of the heat dissipation cavity.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a petrochemical cartridge mechanical seal, including a stirring shaft and a bushing. The bushing is sleeved and fixed on the outer wall of the stirring shaft. A fixed sleeve is fixedly connected to the outer wall of the bushing. A flushing sleeve is provided outside the fixed sleeve. An outer pressure cover is provided on the side wall of the flushing sleeve. A first stationary ring is connected to the outer pressure cover. A first moving ring is slidably connected to the side wall of the fixed sleeve for abutting against the side wall of the first stationary ring. A first elastic element is connected between the first moving ring and the fixed sleeve. A first inclined surface is opened on the side of the first moving ring facing the flushing sleeve. A second inclined surface is opened on the side of the first stationary ring facing the flushing sleeve. A flushing hole is opened on the flushing sleeve. The opening of the flushing hole faces between the first stationary ring and the first moving ring. A heat dissipation cavity is formed between the flushing sleeve, the first moving ring, and the first stationary ring.

[0006] To achieve the above technical solution, the stirring shaft drives the bushing on its outer wall to rotate. Since the fixed sleeve is fixedly connected to the outer wall of the bushing, the fixed sleeve also rotates accordingly. The first stationary ring is connected to the outer pressure cover, which is located on the side wall of the flushing sleeve. The flushing sleeve is relatively fixed, so the first stationary ring remains stationary. The first rotating ring is slidably connected to the rotating side wall of the fixed sleeve and, under the action of the first elastic element, tightly abuts against the side wall of the stationary first stationary ring, forming a dynamic-static sealing friction pair. When the stirring shaft rotates, the first rotating ring rotates with the fixed sleeve, while the first stationary ring remains stationary, thus achieving a dynamic-static seal. During this process, the flushing sleeve has a flushing hole with its opening facing between the first stationary ring and the first rotating ring. This allows the flushing medium to be introduced into the sealing friction pair and the heat dissipation cavity formed between the flushing sleeve, the first rotating ring, and the first stationary ring, thereby achieving flushing and heat dissipation of the sealing end face and the heat dissipation cavity. Because of the flushing sleeve and flushing hole, the flushing medium can directly act on the sealing friction pair between the first stationary ring and the first rotating ring, as well as the heat dissipation cavity formed by the three. The introduction of flushing medium also serves to dissipate heat from the sealed area.

[0007] As a preferred embodiment of this utility model, a convex ring is provided on the outer wall of the stirring shaft, an annular groove is provided on the inner wall of the bushing, a protective sleeve is embedded in the annular groove, an annular groove is provided on the inner wall of the protective sleeve, the convex ring is embedded in the annular groove, and a first O-ring is connected between the outer wall of the protective sleeve and the inner wall of the bushing.

[0008] By achieving the above technical solution, the first O-ring forms an effective seal between the outer wall of the sheath and the inner wall of the bushing. This structure fundamentally prevents the stirring medium from seeping into the gap between the stirring shaft and the bushing, significantly improving the stability and sealing reliability of the connection between the two, and completely eliminating leakage along this path.

[0009] As a preferred embodiment of this utility model, a second O-ring is connected between the first stationary ring and the outer pressure cover, and a third O-ring is connected between the outer pressure cover and the flushing sleeve.

[0010] To achieve the above technical solution, the setting of the second O-ring and the third O-ring ensures the seal between the first stationary ring and the outer pressure cover, and between the outer pressure cover and the flushing sleeve, respectively, further enhancing the leak-proof performance and structural stability of the entire sealing assembly.

[0011] As a preferred embodiment of this utility model, an inner pressure cover is fixedly connected to the side of the outer pressure cover facing away from the flushing sleeve. A receiving cavity is formed on the inner wall of the inner pressure cover. A second stationary ring located in the receiving cavity is fixedly connected to the inner wall of the inner pressure cover. A second moving ring is connected to the outer wall of the bushing through an elastic sliding structure. The second stationary ring and the second moving ring abut against each other.

[0012] To achieve the above technical solution, an inner pressure cover is fixedly connected to the side of the outer pressure cover opposite to the flushing sleeve. The inner wall of the inner pressure cover has a receiving cavity, and a second stationary ring is fixedly connected within this cavity. A first stationary ring is connected to the outer pressure cover on the side wall of the flushing sleeve. A second O-ring provides a seal between the first stationary ring and the outer pressure cover, while a third O-ring provides a seal between the outer pressure cover and the flushing sleeve, ensuring the stationary state of the first and second stationary rings and the sealing integrity of related components. A second rotating ring is connected to the outer wall of the rotating bushing via an elastic sliding structure and tightly abuts against the stationary second stationary ring, forming a second sealing friction pair. The first rotating ring is slidably connected to the side wall of the rotating fixed sleeve and, under the action of a first elastic element, tightly abuts against the side wall of the stationary first stationary ring, forming a first sealing friction pair. When the stirring shaft rotates, the first and second rotating rings rotate with the rotating components, while the first and second stationary rings remain stationary, thus achieving a double dynamic and static seal. This significantly improves the reliability and safety of the seal; even if the first seal fails, the second seal can still effectively prevent media leakage.

[0013] As a preferred embodiment of this utility model, the elastic sliding structure includes a positioning sleeve, a second elastic element, a pressure ring, and a fourth O-ring. The positioning sleeve is fixed on the outer wall of the bushing. The second moving ring and the pressure ring are both slidably connected to the positioning sleeve. The fourth O-ring is connected between the second moving ring and the pressure ring. The two ends of the second elastic element are respectively connected to the side of the pressure ring opposite to the second moving ring and the positioning sleeve.

[0014] To achieve the above technical solution, the fourth O-ring provides a seal between the second rotating ring and the pressure ring, while the two ends of the second elastic element are respectively connected to the side of the pressure ring opposite to the second rotating ring and the positioning sleeve, so that the second rotating ring can rotate with the bushing and elastically and tightly abut against the stationary second stationary ring to form a second sealing friction pair.

[0015] As a preferred embodiment of this utility model, the inner pressure cover is provided with an isolation liquid inlet and an isolation liquid outlet that are both connected to the receiving cavity. The opening of the isolation liquid inlet faces between the second moving ring and the second stationary ring. A guide ring is fixedly connected to the outer wall of the positioning sleeve, and the guide ring corresponds to the opening of the isolation liquid outlet.

[0016] By precisely guiding the isolation fluid inlet, the isolation fluid effectively reaches and acts on the contact surfaces of the second moving ring and the second stationary ring, reducing frictional heat and wear. The cooperation between the isolation fluid outlet and the guide ring ensures smooth discharge of the isolation fluid, preventing impurity accumulation. This significantly improves the service life and stability of the second seal, further enhancing the reliability and safety of the entire mechanical seal.

[0017] As a preferred embodiment of the present invention, the second moving ring has a third inclined surface on the side facing the inlet of the isolation liquid, and the second stationary ring has a fourth inclined surface on the side facing the inlet of the isolation liquid.

[0018] To achieve the above technical solution, a separator fluid inlet on the inner pressure cover introduces separator fluid into the receiving cavity. The opening of the separator fluid inlet faces between the second rotating ring and the second stationary ring, and is further guided by a third inclined surface on the second rotating ring and a fourth inclined surface on the second stationary ring. These two inclined surfaces are positioned opposite each other, which can more effectively guide the separator fluid to the contact area of ​​the sealing friction pair. The separator fluid circulates within the receiving cavity, completing the lubrication and cooling of the sealing end face and carrying away wear particles. Subsequently, the separator fluid is discharged through the separator fluid outlet.

[0019] As a preferred embodiment of this utility model, there is a first gap between the outer pressure cover and the outer wall of the bushing that communicates with the receiving cavity, a second gap between the inner wall of the first stationary ring and the bushing that communicates with the first gap, and a fifth O-ring connecting the inner wall of the first moving ring and the outer wall of the bushing, the fifth O-ring being close to the first elastic element.

[0020] To achieve the above technical solution, a first gap communicating with the receiving cavity is provided between the outer pressure cap and the outer wall of the bushing, and a second gap communicating with the first gap is provided between the inner wall of the first stationary ring and the bushing. This achieves communication between the isolation fluid in the receiving cavity and the back area of ​​the first seal. This communication helps to form a certain isolation fluid pressure on the back of the stationary ring of the first seal, thereby helping to balance the force on the sealing end face, improve sealing stability, and enhance heat dissipation. Simultaneously, the fifth O-ring, located between the inner wall of the first moving ring and the outer wall of the bushing and close to the first elastic element, further provides an additional radial seal, preventing leakage of the isolation fluid between the first moving ring and the bushing, and enhancing the overall reliability of the first seal.

[0021] In a preferred embodiment of this utility model, a fixing ring is provided on the side of the first moving ring facing the first elastic member. The first elastic member is connected to the first moving ring through the fixing ring. The fifth O-ring abuts against the side of the fixing ring facing the first moving ring. A sliding section is integrally connected to the side of the fixing sleeve facing the first moving ring. A sliding groove is provided on the inner wall of the sliding section. A slider is integrally connected to the outer wall of the first moving ring and slidably connected in the sliding groove. An anti-detachment component is provided on the outer wall of the fixing ring for abutting against the side of the sliding section facing the first elastic member.

[0022] To achieve the above technical solution, the fixed ring, acting as the connection medium between the first elastic element and the first rotating ring, ensures the effective transmission of elasticity. The sliding groove on the inner wall of the sliding section slides in connection with the slider on the outer wall of the first rotating ring, forming a precise and stable radial guiding and axial movement mechanism, guaranteeing the stability of the first rotating ring during rotation and its reliable axial compensation capability. The tightness between the fifth O-ring and the fixed ring strengthens the radial seal between the first rotating ring and the bushing.

[0023] As a preferred embodiment of this utility model, the anti-detachment component includes a third elastic element, a mounting recess, an anti-detachment block, and a sliding column. The mounting recess is opened on the outer circular surface of the fixing ring. The sliding column is slidably connected in the mounting recess. The anti-detachment block is fixed to the end of the sliding column away from the fixing ring. The third elastic element is located in the mounting recess and its two ends respectively abut against the inner wall of the mounting recess and the sliding column. The anti-detachment block is located inside the sliding section.

[0024] To achieve the above technical solution, the anti-detachment block is pressed, causing it to move closer to the fixed ring, thus reducing the overall volume. This allows the anti-detachment block to be placed inside the sliding section. After the anti-detachment block moves into the sliding section, the elastic force of the third elastic element causes it to move away from the fixed ring along the axis of the sliding column, making the anti-detachment block contact the inner wall of the sliding section. This prevents the fixed ring from detaching from the sliding section, allowing the fixed ring to stably transmit the elastic force of the first elastic element to the first moving ring. Attached Figure Description

[0025] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0026] Figure 2 for Figure 1 K-direction diagram;

[0027] Figure 3 This is a schematic diagram illustrating the exploded structure of the anti-detachment component;

[0028] Figure 4 This is a schematic diagram illustrating the exploded structure of the anti-detachment component.

[0029] Reference numerals: 1. Stirring shaft; 2. Shaft sleeve; 3. Protruding ring; 4. Annular groove; 5. Protective sleeve; 6. Annular groove; 7. First O-ring; 8. Fixing sleeve; 9. Flushing sleeve; 10. Outer pressure cap; 11. First stationary ring; 12. First moving ring; 13. First elastic element; 14. Fifth O-ring; 15. Fixing ring; 17. Sliding section; 18. Sliding groove; 19. Sliding block; 20. Anti-detachment component; 21. Third elastic element; 22. Mounting recess; 23. Anti-detachment block; 24. Sliding column; 2 5. First inclined surface; 26. Second inclined surface; 27. Flushing hole; 28. Second O-ring; 29. ​​Third O-ring; 30. Inner pressure cap; 31. Receiving cavity; 32. Second stationary ring; 33. Elastic sliding structure; 34. Positioning sleeve; 35. Second elastic element; 36. Pressure ring; 37. Fourth O-ring; 38. Isolation fluid inlet; 39. Isolation fluid outlet; 40. Guide ring; 41. Third inclined surface; 42. Fourth inclined surface; 43. First gap; 44. Second gap; 45. Second moving ring. Detailed Implementation

[0030] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, so that the technical solution of this utility model can be more easily understood and mastered.

[0031] A petrochemical container-type mechanical seal includes an agitator shaft 1 and a bushing 2, wherein the bushing 2 is fitted and fixed to the outer wall of the agitator shaft 1.

[0032] A coaxial convex ring 3 is integrally formed on the outer wall of the stirring shaft 1. An annular groove 4 is formed on the inner wall of the bushing 2, and a protective sleeve 5 is embedded in the annular groove 4. An annular groove 6 is formed on the inner wall of the protective sleeve 5. The convex ring 3 is embedded in the annular groove 6. A first O-ring 7 is connected between the outer wall of the protective sleeve 5 and the inner wall of the bushing 2.

[0033] A fixing sleeve 8 is fixedly connected to the outer wall of the bushing 2 by a set screw. The fixing sleeve 8 is located outside the bushing 2.

[0034] A flushing sleeve 9 is provided outside the fixed sleeve 8, and an outer pressure cover 10 is provided on the side wall of the flushing sleeve 9. A first stationary ring 11 is fixedly connected to the outer pressure cover 10, and the first stationary ring 11 is sleeved on the outside of the bushing 2. A first moving ring 12 is slidably connected to the side wall of the fixed sleeve 8 for abutting against the side wall of the first stationary ring 11. A first elastic element 13 is connected between the first moving ring 12 and the fixed sleeve 8. The first elastic element 13 is a spring.

[0035] A fifth O-ring 14 is connected between the inner wall of the first moving ring 12 and the outer wall of the bushing 2, and the fifth O-ring 14 is close to the first elastic member 13.

[0036] A fixing ring 15 is provided on the side of the first moving ring 12 facing the first elastic member 13. The first elastic member 13 is connected to the first moving ring 12 through the fixing ring 15. The fifth O-ring 14 abuts against the side of the fixing ring 15 facing the first moving ring 12. A sliding section 17 is integrally connected to the side of the fixing sleeve 8 facing the first moving ring 12. A sliding groove 18 is formed on the inner wall of the sliding section 17, and the cross-section of the sliding groove 18 is square. A slider 19 is integrally connected to the outer wall of the first moving ring 12 and is slidably connected in the sliding groove 18. The slider 19 is set as a cuboid. An anti-detachment component 20 is provided on the outer wall of the fixing ring 15 for abutting against the side of the sliding section 17 facing the first elastic member 13.

[0037] The anti-detachment component 20 includes a third elastic element 21, a mounting recess 22, an anti-detachment block 23, and a sliding post 24. The mounting recess 22 is formed on the outer circumferential surface of the retaining ring 15, and its cross-section is square. The sliding post 24 is slidably connected within the mounting recess 22. The anti-detachment block 23 is fixed to the end of the sliding post 24 away from the retaining ring 15. The third elastic element 21 is located within the mounting recess 22, and its two ends respectively abut against the inner wall of the mounting recess 22 and the sliding post 24. The third elastic element 21 is a spring.

[0038] Press the anti-detachment block 23 to move it closer to the fixing ring 15, so that both the fixing ring 15 and the anti-detachment block 23 can move into the interior of the sliding section 17. After the fixing ring 15 moves into the interior of the sliding section 17, the sliding column 24 moves along the axial direction of the mounting recess 22 due to the elastic force of the third elastic element 21. The anti-detachment block 23 abuts against the inner wall of the sliding section 17, so that the fixing ring 15 cannot be dislodged from the sliding section 17.

[0039] A first inclined surface 25 is provided on the side of the first moving ring 12 facing the flushing sleeve 9, and a second inclined surface 26 is provided on the side of the first stationary ring 11 facing the flushing sleeve 9. A flushing hole 27 is provided on the flushing sleeve 9, with the opening of the flushing hole 27 facing between the first stationary ring 11 and the first moving ring 12. A heat dissipation cavity is formed between the flushing sleeve 9, the first moving ring 12, and the first stationary ring 11, and the flushing hole 27 communicates with the heat dissipation cavity.

[0040] A second O-ring 28 is connected between the first stationary ring 11 and the outer pressure cover 10; a third O-ring 29 is connected between the outer pressure cover 10 and the flushing sleeve 9.

[0041] An inner pressure cover 30 is fixedly connected to the side of the outer pressure cover 10 opposite to the flushing sleeve 9 by a stud screw. A receiving cavity 31 is formed on the inner wall of the inner pressure cover 30, and a second stationary ring 32 located in the receiving cavity 31 is fixedly connected to the inner wall of the inner pressure cover 30. The second stationary ring 32 is located outside the bushing 2. A second moving ring 45 is connected to the outer wall of the bushing 2 by an elastic sliding structure 33, and the second stationary ring 32 abuts against the second moving ring 45.

[0042] The elastic sliding structure 33 includes a positioning sleeve 34, a second elastic element 35, a pressure ring 36, and a fourth O-ring 37. The positioning sleeve 34 is fixed to the outer wall of the bushing 2 by a set screw. The second moving ring 45 and the pressure ring 36 are both slidably connected to the positioning sleeve 34. The fourth O-ring 37 is connected between the second moving ring 45 and the pressure ring 36. An annular groove is formed on the side of the second moving ring 45 facing the bushing 2, and the fourth O-ring 37 is embedded in the annular groove. The end of the pressure ring 36 passes through the annular groove and abuts against the fourth O-ring 37. Both ends of the second elastic element 35 are connected to the side of the pressure ring 36 opposite to the second moving ring 45 and the positioning sleeve 34, respectively. The second elastic element 35 is a spring.

[0043] The inner pressure cover 30 has a separator liquid inlet 38 and a separator liquid outlet 39, both of which communicate with the receiving cavity 31. The opening of the separator liquid inlet 38 faces between the second moving ring 45 and the second stationary ring 32. A guide ring 40 is fixedly connected to the outer wall of the positioning sleeve 34, and the guide ring 40 corresponds to the opening of the separator liquid outlet 39.

[0044] A third inclined surface 41 is provided on the side of the second moving ring 45 facing the isolation liquid inlet 38, and a fourth inclined surface 42 is provided on the side of the second stationary ring 32 facing the isolation liquid inlet 38.

[0045] There is a first gap 43 between the outer pressure cover 10 and the outer wall of the bushing 2, which communicates with the receiving cavity 31; there is a second gap 44 between the inner wall of the first stationary ring 11 and the bushing 2, which communicates with the first gap 43.

[0046] When the stirring shaft 1 is in operation, the integrated protruding ring 3 on its outer wall precisely engages with the annular groove 6 on the inner wall of the protective sleeve 5 embedded in the annular groove 4 on the inner wall of the bushing 2. Simultaneously, the first O-ring 7 connects the outer wall of the protective sleeve 5 and the inner wall of the bushing 2, thus forming a reliable sealing structure between the bushing 2 and the stirring shaft 1. Since the bushing 2 is fitted and fixed to the outer wall of the stirring shaft 1, the rotation of the stirring shaft 1 directly drives the bushing 2 to rotate as well. The fixing sleeve 8 is fixedly connected to the outer wall of the bushing 2 by set screws, so the fixing sleeve 8 also rotates accordingly. A sliding section 17 is integratedly connected to the side of the fixing sleeve 8 facing the first moving ring 12, and a square-section sliding groove 18 is formed on the inner wall of the sliding section 17. A cuboid slider 19 is integratedly connected to the outer wall of the first moving ring 12 and slidably connected in the sliding groove 18, allowing the first moving ring 12 to rotate and slide axially with the fixing sleeve 8. A retaining ring 15 is provided on the side of the first moving ring 12 facing the first elastic member 13. The first elastic member 13, acting as a spring, is connected to the first moving ring 12 through the retaining ring 15, providing axial thrust. The fifth O-ring 14 is connected between the inner wall of the first moving ring 12 and the outer wall of the bushing 2, and abuts against the side of the retaining ring 15 facing the first moving ring 12, ensuring a radial seal between the first moving ring 12 and the bushing 2.

[0047] In addition, an anti-detachment component 20 is provided on the outer wall of the fixing ring 15. This component includes a mounting recess 22 with a square cross-section opened on the outer circular surface of the fixing ring 15, a sliding post 24 slidably connected in the mounting recess 22, an anti-detachment block 23 fixed to one end of the sliding post 24 away from the fixing ring 15, and a third elastic member 21 located in the mounting recess 22 with both ends abutting against the inner wall of the mounting recess 22 and the sliding post 24, respectively. The anti-detachment block 23 is located between the first elastic member 13 and the sliding segment 17. Under the action of the third elastic member 21, the anti-detachment block 23 is displaced and forms a reliable axial limit with the sliding segment 17.

[0048] So that when the first moving ring 12 is replaced, the fixed ring 15 cannot be dislodged from the sliding section 17.

[0049] An outer pressure cap 10 is disposed on the side wall of the flushing sleeve 9, and an inner pressure cap 30 is fixedly connected to the side of the outer pressure cap 10 facing away from the flushing sleeve 9 by a stud screw. A receiving cavity 31 is formed on the inner wall of the inner pressure cap 30, and a second stationary ring 32 located outside the bushing 2 is fixedly connected in the receiving cavity 31. The inner pressure cap 30 is also provided with a separator liquid inlet 38 and a separator liquid outlet 39, both of which communicate with the receiving cavity 31. The opening of the separator liquid inlet 38 faces between the second moving ring 45 and the second stationary ring 32, and is further guided by a third inclined surface 41 on the second moving ring 45 and a fourth inclined surface 42 on the second stationary ring 32. A guide ring 40 fixed to the outer wall of the positioning sleeve 34 corresponds to the opening of the separator liquid outlet 39, together ensuring the effective circulation of the separator liquid.

[0050] The first stationary ring 11 is fixedly connected to the outer pressure cover 10 and is sleeved on the outside of the bushing 2. The second O-ring 28 provides a seal between the first stationary ring 11 and the outer pressure cover 10, while the third O-ring 29 provides a seal between the outer pressure cover 10 and the flushing sleeve 9, ensuring the stationary state of the first stationary ring 11 and the second stationary ring 32 and the sealing integrity of the related components.

[0051] The second rotating ring 45 is connected to the outer wall of the rotating bushing 2 via an elastic sliding structure 33. This elastic sliding structure 33 includes a positioning sleeve 34 fixed to the outer wall of the bushing 2 by a set screw, and a second rotating ring 45 and a pressure ring 36 slidably connected to the positioning sleeve 34. A fourth O-ring 37 is connected between the second rotating ring 45 and the pressure ring 36. The fourth O-ring 37 is embedded in an annular groove on the side of the second rotating ring 45 facing the bushing 2, and the end of the pressure ring 36 passes through the annular groove and abuts against the fourth O-ring 37. The two ends of the second elastic element 35, acting as a spring, are respectively connected to the side of the pressure ring 36 opposite to the second rotating ring 45 and the positioning sleeve 34, thereby allowing the second rotating ring 45 to rotate with the bushing 2 and elastically and tightly abut against the stationary second stationary ring 32, forming a second sealing friction pair.

[0052] When the stirring shaft 1 rotates, the first moving ring 12 and the second moving ring 45 rotate together with the rotating components, while the first stationary ring 11 and the second stationary ring 32 remain stationary, thus achieving a double dynamic and static seal. During this process, the flushing sleeve 9 has a flushing hole 27, the opening of which faces between the first stationary ring 11 and the first moving ring 12. This allows the flushing medium to be introduced into the sealing friction pair and the heat dissipation cavity formed between the flushing sleeve 9, the first moving ring 12, and the first stationary ring 11, thereby achieving flushing and heat dissipation of the sealing end face and the heat dissipation cavity. At the same time, the isolation liquid inlet 38 can introduce the isolation liquid into the friction pair between the second moving ring 45 and the second stationary ring 32 and into the receiving cavity 31, and effectively discharge it through the isolation liquid outlet 39 with the cooperation of the guide ring 40, achieving lubrication, cooling, and flushing of the second seal. In addition, there is a first gap 43 between the outer pressure cap 10 and the outer wall of the bushing 2, which communicates with the receiving cavity 31, and a second gap 44 between the inner wall of the first stationary ring 11 and the bushing 2, which communicates with the first gap 43, so that the isolation fluid in the receiving cavity 31 can enter the back area of ​​the first stationary ring 11 and the first moving ring 12 through the first gap 43 and the second gap 44, which helps to balance the force on the sealing end face.

[0053] Of course, the above are just typical examples of this utility model. In addition, this utility model may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by this utility model.

Claims

1. A containerized mechanical seal for petrochemical applications, comprising an agitator shaft (1) and a bushing (2), wherein the bushing (2) is fitted and fixed to the outer wall of the agitator shaft (1), characterized in that: A fixed sleeve (8) is fixedly connected to the outer wall of the bushing (2). A flushing sleeve (9) is provided outside the fixed sleeve (8). An outer pressure cover (10) is provided on the side wall of the flushing sleeve (9). A first stationary ring (11) is connected to the outer pressure cover (10). A first moving ring (12) for abutting against the side wall of the first stationary ring (11) is slidably connected to the side wall of the fixed sleeve (8). A first elastic element is connected between the first moving ring (12) and the fixed sleeve (8). 13) The first moving ring (12) has a first inclined surface (25) on the side facing the flushing sleeve (9), and the first stationary ring (11) has a second inclined surface (26) on the side facing the flushing sleeve (9). The flushing sleeve (9) has a flushing hole (27) with the opening of the flushing hole (27) facing between the first stationary ring (11) and the first moving ring (12). A heat dissipation cavity is formed between the flushing sleeve (9), the first moving ring (12), and the first stationary ring (11).

2. A containerized mechanical seal for petrochemical applications according to claim 1, characterized in that: A convex ring (3) is provided on the outer wall of the stirring shaft (1), an annular groove (4) is provided on the inner wall of the bushing (2), a protective sleeve (5) is embedded in the annular groove (4), an annular groove (6) is provided on the inner wall of the protective sleeve (5), the convex ring (3) is embedded in the annular groove (6), and a first O-ring (7) is connected between the outer wall of the protective sleeve (5) and the inner wall of the bushing (2).

3. A containerized mechanical seal for petrochemical applications according to claim 1, characterized in that: A second O-ring (28) is connected between the first stationary ring (11) and the outer pressure cover (10), and a third O-ring (29) is connected between the outer pressure cover (10) and the flushing sleeve (9).

4. A containerized mechanical seal for petrochemical applications according to claim 1, characterized in that: The outer pressure cover (10) is fixedly connected to the inner pressure cover (30) on the side opposite to the flushing sleeve (9). The inner wall of the inner pressure cover (30) is provided with a receiving cavity (31). The inner wall of the inner pressure cover (30) is fixedly connected to a second stationary ring (32) located in the receiving cavity (31). The outer wall of the bushing (2) is connected to a second moving ring (45) through an elastic sliding structure (33). The second stationary ring (32) and the second moving ring (45) abut against each other.

5. A containerized mechanical seal for petrochemical applications according to claim 4, characterized in that: The elastic sliding structure (33) includes a positioning sleeve (34), a second elastic element (35), a pressure ring (36), and a fourth O-ring (37). The positioning sleeve (34) is fixed on the outer wall of the bushing (2). The second moving ring (45) and the pressure ring (36) are slidably connected to the positioning sleeve (34). The fourth O-ring (37) is connected between the second moving ring (45) and the pressure ring (36). The two ends of the second elastic element (35) are respectively connected to the side of the pressure ring (36) opposite to the second moving ring (45) and the positioning sleeve (34).

6. A containerized mechanical seal for petrochemical applications according to claim 5, characterized in that: The inner pressure cover (30) has an isolation liquid inlet (38) and an isolation liquid outlet (39) that are both connected to the receiving cavity (31). The opening of the isolation liquid inlet (38) faces between the second moving ring (45) and the second stationary ring (32). A guide ring (40) is fixedly connected to the outer wall of the positioning sleeve (34). The guide ring (40) corresponds to the opening of the isolation liquid outlet (39).

7. A containerized mechanical seal for petrochemical applications according to claim 6, characterized in that: The second moving ring (45) has a third inclined surface (41) on the side facing the isolation liquid inlet (38), and the second stationary ring (32) has a fourth inclined surface (42) on the side facing the isolation liquid inlet (38).

8. A containerized mechanical seal for petrochemical applications according to claim 6, characterized in that: The outer pressure cap (10) and the outer wall of the bushing (2) have a first gap (43) communicating with the receiving cavity (31). The inner wall of the first stationary ring (11) and the bushing (2) have a second gap (44) communicating with the first gap (43). The inner wall of the first moving ring (12) and the outer wall of the bushing (2) are connected by a fifth O-ring (14), which is close to the first elastic member (13).

9. A containerized mechanical seal for petrochemical applications according to claim 8, characterized in that: A fixing ring (15) is provided on the side of the first moving ring (12) facing the first elastic member (13). The first elastic member (13) is connected to the first moving ring (12) through the fixing ring (15). The fifth O-ring (14) and the fixing ring (15) are pressed against the side of the first moving ring (12). The fixing sleeve (8) is integrally connected to the side of the first moving ring (12) with a sliding section (17). A sliding groove (18) is provided on the inner wall of the sliding section (17). A slider (19) is integrally connected to the outer wall of the first moving ring (12) and is slidably connected in the sliding groove (18). An anti-detachment component (20) is provided on the outer wall of the fixing ring (15) for abutting against the side of the sliding section (17) facing the first elastic member (13).

10. A containerized mechanical seal for petrochemical applications according to claim 9, characterized in that: The anti-detachment component (20) includes a third elastic element (21), a mounting recess (22), an anti-detachment block (23), and a sliding column (24). The mounting recess (22) is opened on the outer circular surface of the fixing ring (15). The sliding column (24) is slidably connected in the mounting recess (22). The anti-detachment block (23) is fixed to the end of the sliding column (24) away from the fixing ring (15). The third elastic element (21) is located in the mounting recess (22) and its two ends abut against the inner wall of the mounting recess (22) and the sliding column (24) respectively. The anti-detachment block (23) is located inside the sliding section (17).

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