Low-cost corrosion-resistant mechanical seal

Abstract

The utility model relates to the technical field of mechanical seals, and discloses a low-cost corrosion-resistant mechanical seal which comprises a pump shaft, a clamping groove is formed in the outer side of the pump shaft, a first main static ring is arranged on the outer side of the pump shaft, a flange is fixedly installed on the outer side of the first main static ring through a bolt, and a positioning clamp is fixedly installed on one side of the flange. A liquid inlet assembly is fixedly installed on the outer side of the flange, a fixing disc is fixedly installed on one side of the flange, a screw is arranged on one side of the positioning clamp, two same through holes are formed in the two sides of the flange, one through hole serves as a liquid inlet, and the other through hole serves as a liquid outlet. According to the low-cost corrosion-resistant mechanical seal, when the mechanical seal is installed on a pump, the flange and the pump cover are locked through bolts, the first positioning ring and the third positioning ring can be pressed, the first flexible positioning ring can be fixed between the flange and the pump cover, sealing can be achieved, and at the moment, the third positioning ring is sleeved on the first main static ring and is not stressed; and the device plays a role when being disassembled and assembled next time.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical seals, in particular to a low-cost corrosion-resistant mechanical seal. Background Art

[0002] In various pumps for conveying media, since the pump housing and the pump shaft rotate relatively, there will be a certain gap between them. In order to prevent the conveyed medium from leaking outward along the gap, mechanical seals are generally provided in various pumps. Existing mechanical seals generally include a moving ring assembly and a stationary ring assembly. The moving ring assembly includes a sleeve for connecting with the pump shaft and a moving ring, a moving ring seat, a spring, and a spring seat sleeved on the sleeve. The moving ring is mounted on the moving ring seat, the spring is pressed between the moving ring seat and the spring seat, and the spring seat is welded to the sleeve.

[0003] Under highly corrosive working conditions such as strong acid or very high chloride ion content, the more corrosion-resistant Hastelloy is generally selected as the mechanical seal matrix. However, Hastelloy is relatively expensive and the cost of mechanical seals remains high. There are also some working conditions that Hastelloy cannot withstand, and mechanical seal design is even more of a problem. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a low-cost corrosion-resistant mechanical seal, which can effectively solve the problems in the prior art that Hastelloy is relatively expensive, the cost of mechanical seals remains high, and some working conditions that Hastelloy cannot withstand.

[0005] The technical solution adopted by the present invention is: a low-cost corrosion-resistant mechanical seal, including a pump shaft, a card groove is provided on the outer side of the pump shaft, a main static ring 1 is arranged on the outer side of the pump shaft, a flange is fixedly installed on the outer side of the main static ring 1 by bolts, a positioning clip is fixedly installed on one side of the flange, a liquid inlet component is fixedly installed on the outer side of the flange, a fixing plate is fixedly installed on one side of the flange, a screw is arranged on one side of the positioning clip, through holes are provided on both sides of the flange, two identical through holes are arranged, one of the through holes is a liquid inlet, and the other through hole is a liquid outlet, a driving ring is fixedly installed on one side of the positioning clip, and a positioning assembly is fixedly installed on one side of the main static ring 1. Positioning ring one, positioning ring two and positioning ring three, the main static ring one is fixedly installed with the main static ring two on one side, the main static ring two is fixedly installed with the active ring close to the pump shaft, the main static ring two is fixedly installed with the positioning ring four on one side, the main static ring two is fixedly installed with the main thrust ring on one side, a spring is fixedly installed on the outside of the main thrust ring, a sealing ring one is fixedly installed on the outside of the pump shaft, a secondary thrust ring is fixedly installed on the other side of the spring, a sealing ring two is fixedly installed on the outside of the secondary thrust ring, the main static ring three is fixedly installed on one side of the secondary thrust ring, a sealing ring three is arranged on one side of the main static ring three, a sealing ring four is fixedly installed on the outside of the flange, and a shaft sleeve is fixedly installed on one side of the positioning ring four.

[0006] Preferably, the liquid inlet assembly includes a ferrule, a threaded hole is provided on one side of the ferrule, a positioning hole is provided on the other side of the ferrule, a positioning bolt is penetrated through the positioning hole, the ferrule is adapted to the positioning clip, and the positioning bolt penetrates the positioning hole and the positioning clip and extends to the outside of the ferrule.

[0007] Through the above technical solution, through the design of the positioning bolt, the positioning hole and the clamping sleeve can be cooperated to make the liquid inlet component snap into the outside of the positioning clip, so as to realize the rapid positioning of the entire liquid inlet component and facilitate the installation of the entire liquid inlet component to the outside of the machine seal.

[0008] Preferably, the liquid inlet assembly also includes a connecting sleeve arranged on the top of the threaded hole, a liquid inlet pipe is arranged on the top of the connecting sleeve, a sealing gasket is fixedly installed on the inner side of the liquid inlet pipe, the threaded hole and the connecting sleeve are threadedly connected, and the threaded hole, the liquid inlet pipe and the through hole are adapted to each other.

[0009] Through the above technical solution, through the design of the threaded hole and the connecting sleeve, the connecting sleeve can be easily installed on the outside of the ferrule. In combination with the threaded hole, the liquid inlet pipe and the through hole, the liquid can be input from the liquid inlet pipe and then enter the through hole, which can facilitate the rapid input of liquid. In combination with the sealing gasket, the overall sealing can be improved.

[0010] Preferably, two identical liquid inlet components are provided, and the liquid inlet components correspond to the through holes in a one-to-one manner.

[0011] Through the above technical solution, through the design of two liquid inlet components, the liquid inlet components can be installed at both ends of the through hole, liquid can be input from one side to achieve liquid sealing, and the inner liquid can be discharged from the other end to achieve overall circulation.

[0012] Preferably, the positioning ring three is located between the main static ring one and the flange, and the positioning ring three is a fluororubber positioning ring.

[0013] Through the above technical solution, the positioning ring three is located between the main static ring one and the flange, so that the entire mechanical seal is a complete whole when not installed on the pump, which is convenient for users to quickly install and avoids the need for multiple assembly during use.

[0014] Preferably, the flange is fixedly mounted to the pump cover by bolts, and the positioning ring is located between the flange and the pump cover.

[0015] Through the above technical solution, when the mechanical seal is installed on the pump, the flange and the pump cover are locked by bolts, so that the positioning ring 1 and the positioning ring 3 are under pressure, and the flexible positioning ring 1 can be fixed between the flange and the pump cover to achieve sealing. At this time, the positioning ring 3 is not subjected to force on the main static ring 1 and will work again during the next disassembly and assembly.

[0016] Preferably, the active ring and the positioning ring four are matched with each other, and the positioning ring four is located on the outside of the sleeve.

[0017] Through the above technical solution, when the cooling water pressure is higher than the pump chamber pressure, the cooling water pressure will push the positioning ring four to move toward the pump chamber, and the active ring will block this displacement to ensure the sealing performance of the positioning ring four.

[0018] Preferably, the sealing ring 1 is matched with the slot, and the other end of the sealing ring 1 is fitted with the shaft sleeve.

[0019] Through the above technical solution, through the cooperation between the sealing ring 1 and the slot, the sealing ring 1 can be quickly installed and can also be inserted into the slot, thereby improving the sealing performance of the shaft sleeve and the pump shaft.

[0020] Preferably, the screws are provided in equal numbers, and the screws are distributed in a ring shape about the center line of the pump shaft.

[0021] Through the above technical solution, through the design of multiple screws, the positioning clip and the drive ring can be quickly installed, the overall device can be integrated, and the multiple screws can also increase the service life of the screws.

[0022] Preferably, the first main static ring and the second main static ring are silicon carbide ceramic main static rings, and the active ring is a polytetrafluoroethylene active ring.

[0023] Through the above technical scheme, the main static ring 1 and the main static ring 2 made of silicon carbide ceramic can reduce the production cost of the overall seal, and at the same time, the polytetrafluoroethylene active ring can be used, which not only has economic cost but also has corrosion resistance to improve practicality.

[0024] Compared with the prior art, the present invention provides a low-cost corrosion-resistant mechanical seal, which has the following beneficial effects:

[0025] The low-cost corrosion-resistant mechanical seal has only the first locating ring, the flange, the second main static ring and the second active ring in contact with the medium. The first and second main static rings made of silicon carbide ceramic can reduce the production cost of the overall seal, and the active ring of polytetrafluoroethylene can improve the practicality by not only economic cost but also corrosion resistance. When the cooling water pressure is higher than the pump chamber pressure, the pressure of the cooling water will push the fourth locating ring to move toward the pump chamber, and the active ring will block this displacement to ensure the sealing performance of the fourth locating ring.

[0026] The low-cost corrosion-resistant mechanical seal can be designed with a positioning bolt, and can be matched with a positioning hole and a clamping sleeve so that the liquid inlet component is clamped to the outside of the positioning clamp, so that the overall liquid inlet component can be quickly positioned, and the overall liquid inlet component can be easily installed to the outside of the mechanical seal. The threaded hole and the connecting sleeve can be designed to facilitate the installation of the connecting sleeve to the outside of the clamping sleeve. The threaded hole, the liquid inlet pipe and the through hole can be matched to input liquid from the liquid inlet pipe and then enter the through hole, so that the liquid can be quickly input. The sealing gasket can be matched to improve the overall sealing performance.

[0027] The low-cost corrosion-resistant mechanical seal has a positioning ring 3 located between the main static ring 1 and the flange, so that the entire mechanical seal is a complete whole when not installed on the pump, which is convenient for users to quickly install and avoids the need for multiple assembly during use;

[0028] The low-cost corrosion-resistant mechanical seal has the following advantages: when the mechanical seal is installed on the pump, the flange and the pump cover are locked by bolts, so that the locating ring 1 and the locating ring 3 are under pressure, and the flexible locating ring 1 can be fixed between the flange and the pump cover to achieve sealing. At this time, the locating ring 3 is not subjected to force when it is sleeved on the main static ring 1, and will work again when it is disassembled and assembled next time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ;

[0030] Figure 2 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ;

[0031] Figure 3 The three-dimensional structure of the present invention is shown in FIG. Figure 3 ;

[0032] Figure 4 This is a schematic diagram of the flange and through hole installation structure of the present invention;

[0033] Figure 5 It is a schematic diagram of the cross-sectional structure of the present invention;

[0034] Figure 6 This is a schematic diagram of the installation structure of the pump shaft and the main static ring of the present invention;

[0035] Figure 7 This is a schematic diagram of the split structure of the liquid inlet component of the present invention;

[0036] Figure 8 It is a schematic diagram of the installation structure of the liquid inlet assembly and the positioning clip of the present invention.

[0037] Wherein: 1. pump shaft; 2. slot; 3. main static ring 1; 4. flange; 5. positioning clip; 6. liquid inlet assembly; 601. sleeve; 602. threaded hole; 603. positioning hole; 604. positioning bolt; 605. connecting sleeve; 606. liquid inlet pipe; 607. sealing gasket; 7. fixing plate; 8. screw; 9. through hole; 10. driving ring; 11. positioning ring 1; 12. positioning ring 2; 13. positioning ring 3; 14. main static ring 2; 15. driving ring; 16. positioning ring 4; 17. main thrust ring; 18. spring; 19. sealing ring 1; 20. auxiliary thrust ring; 21. sealing ring 2; 22. main static ring 3; 23. sealing ring 3; 25. sealing ring 4; 26. shaft sleeve. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Embodiment 1: Figure 1-8 As shown, a low-cost corrosion-resistant mechanical seal provided by the present invention comprises a pump shaft 1, a card slot 2 is provided on the outer side of the pump shaft 1, a main static ring 3 is provided on the outer side of the pump shaft 1, a flange 4 is fixedly installed on the outer side of the main static ring 3 by bolts, a positioning clip 5 is fixedly installed on one side of the flange 4, a liquid inlet component 6 is fixedly installed on the outer side of the flange 4, a fixing plate 7 is fixedly installed on one side of the flange 4, a screw 8 is provided on one side of the positioning clip 5, through holes 9 are provided on both sides of the flange 4, two identical through holes 9 are provided, one through hole 9 is a liquid inlet, and the other through hole 9 is a liquid outlet, a driving ring 10 is fixedly installed on one side of the positioning clip 5, and a positioning ring 11, a positioning ring 2 12 and a positioning ring 3 are fixedly installed on one side of the main static ring 3 13. A main static ring 2 14 is fixedly installed on one side of the main static ring 1 3. An active ring 15 is fixedly installed on the side of the main static ring 2 14 close to the pump shaft 1. A positioning ring 4 16 is fixedly installed on one side of the main static ring 2 14. A main thrust ring 17 is fixedly installed on one side of the main static ring 2 14. A spring 18 is fixedly installed on the outer side of the main thrust ring 17. A sealing ring 19 is fixedly installed on the outer side of the pump shaft 1. A secondary thrust ring 20 is fixedly installed on the other side of the spring 18. A sealing ring 21 is fixedly installed on the outer side of the secondary thrust ring 20. A main static ring 3 22 is fixedly installed on one side of the secondary thrust ring 20. A sealing ring 3 23 is arranged on one side of the main static ring 3 22. A sealing ring 4 25 is fixedly installed on the outer side of the flange 4. A shaft sleeve 26 is fixedly installed on one side of the positioning ring 4 16.

[0040] Specifically, the liquid inlet component 6 includes a ferrule 601, a threaded hole 602 is provided on one side of the ferrule 601, a positioning hole 603 is provided on the other side of the ferrule 601, a positioning bolt 604 is penetrated through the positioning hole 603, the ferrule 601 is adapted to the positioning clip 5, the positioning bolt 604 penetrates the positioning hole 603 and the positioning clip 5 and extends to the outside of the ferrule 601. The advantage is that, through the design of the positioning bolt 604, the positioning hole 603 and the ferrule 601 can be matched so that the liquid inlet component 6 can be inserted into the outside of the positioning clip 5, thereby realizing the rapid positioning of the overall liquid inlet component 6 and facilitating the installation of the overall liquid inlet component 6 to the outside of the mechanical seal.

[0041] Specifically, the liquid inlet component 6 also includes a connecting sleeve 605 arranged on the top of the threaded hole 602, a liquid inlet pipe 606 is arranged on the top of the connecting sleeve 605, a sealing gasket 607 is fixedly installed on the inner side of the liquid inlet pipe 606, the threaded hole 602 and the connecting sleeve 605 are threadedly connected, the threaded hole 602, the liquid inlet pipe 606 and the through hole 9 are adapted to each other. The advantage is that, through the design of the threaded hole 602 and the connecting sleeve 605, the connecting sleeve 605 can be easily installed to the outside of the ferrule 601, and with the threaded hole 602, the liquid inlet pipe 606 and the through hole 9, liquid can be input from the liquid inlet pipe 606 and then enter into the through hole 9, which can facilitate the rapid input of liquid, and with the sealing gasket 607, the overall sealing can be improved.

[0042] Specifically, two identical liquid inlet components 6 are provided, and the liquid inlet components 6 correspond to the through holes 9 one by one. The advantage is that, through the design of the two liquid inlet components 6, the liquid inlet components 6 can be installed at both ends of the through holes 9, liquid can be input from one side to achieve liquid sealing, and the inner liquid can be discharged from the other end, so as to realize the overall circulation.

[0043] Specifically, the positioning ring three 13 is located between the main static ring 1 3 and the flange 4. The positioning ring three 13 is a fluororubber positioning ring. The advantage is that the positioning ring three 13 is located between the main static ring 1 3 and the flange 4, so that the entire mechanical seal is a complete whole when not installed on the pump, which is convenient for users to quickly install and avoid the need to implement multiple assembly during use.

[0044] Specifically, the flange 4 is fixed to the pump cover by bolts, and the positioning ring 11 is located between the flange 4 and the pump cover. The advantage is that when the mechanical seal is installed on the pump, the flange 4 and the pump cover are locked by bolts, so that the positioning ring 11 and the positioning ring 3 13 can be pressurized, and the flexible positioning ring 11 can be fixed between the flange 4 and the pump cover to achieve sealing. At this time, the positioning ring 3 13 is not subjected to force when it is sleeved on the main static ring 3, and will work again during the next disassembly and assembly.

[0045] Embodiment 2: Figure 2-8 As shown, as an improvement to the previous embodiment.

[0046] Specifically, the active ring 15 and the positioning ring four 16 are adapted to each other, and the positioning ring four 16 is located on the outside of the shaft sleeve 26. The advantage is that when the cooling water pressure is higher than the pump chamber pressure, the cooling water pressure will push the positioning ring four 16 to move toward the pump chamber, and the active ring 15 will block this displacement to ensure the sealing performance of the positioning ring four 16.

[0047] Specifically, the sealing ring 19 is adapted to the slot 2, and the other end of the sealing ring 19 is fitted with the shaft sleeve 26. The advantage is that through the cooperation between the sealing ring 19 and the slot 2, the sealing ring 19 can be quickly installed and the sealing ring 19 can be inserted into the slot 2, thereby improving the sealing performance of the shaft sleeve 26 and the pump shaft 1.

[0048] Specifically, the screws 8 are provided in a plurality, and the plurality of screws 8 are distributed in a ring shape about the center line of the pump shaft 1. The advantage is that the design of the plurality of screws 8 facilitates quick installation of the positioning clip 5 and the drive ring 10, so that the overall device can be integrated, and the plurality of screws 8 can also increase the service life of the screws 8.

[0049] Specifically, the main static ring 1 3 and the main static ring 2 14 are silicon carbide ceramic main static rings, and the active ring 15 is a polytetrafluoroethylene active ring. The advantage is that the main static ring 1 3 and the main static ring 2 14 made of silicon carbide ceramic can reduce the production cost of the overall seal, and the polytetrafluoroethylene active ring 15 can also improve practicality by having low economic cost and corrosion resistance.

[0050] Working principle: When in use, through the design of the positioning bolt 604, the positioning hole 603 and the clamping sleeve 601 can be matched to make the liquid inlet component 6 snap into the outside of the positioning clip 5, so as to realize the rapid positioning of the entire liquid inlet component 6, and facilitate the installation of the entire liquid inlet component 6 to the outside of the machine seal. Through the design of the threaded hole 602 and the connecting sleeve 605, it is convenient to install the connecting sleeve 605 to the outside of the clamping sleeve 601, and with the threaded hole 602, the liquid inlet pipe 606 and the through hole 9, the liquid can be input from the liquid inlet pipe 606 and then enter the through hole 9, so as to facilitate For rapid liquid input, combined with the sealing gasket 607, the overall sealing can be improved. Through the design of two liquid inlet components 6, the liquid inlet components 6 can be installed at both ends of the through hole 9, liquid can be input from one side to achieve liquid sealing, and the inner liquid can be discharged from the other end to achieve overall circulation. The positioning ring 3 13 is located between the main static ring 3 and the flange 4, so that the entire mechanical seal is a complete whole when not installed on the pump, which is convenient for users to quickly install and avoid multiple assembly during use. When the mechanical seal is installed on the pump, The flange 4 and the pump cover are locked by bolts, so that the positioning ring 11 and the positioning ring 3 13 are under pressure, and the flexible positioning ring 11 can be fixed between the flange 4 and the pump cover to achieve sealing. At this time, the positioning ring 3 13 is sleeved on the main static ring 3 without force, and will work again during the next disassembly and assembly. When the cooling water pressure is higher than the pump chamber pressure, the pressure of the cooling water will push the positioning ring 4 16 to move toward the pump chamber, and the active ring 15 will block this displacement to ensure the sealing performance of the positioning ring 4 16. Through the cooperation of the sealing ring 19 and the slot 2, the sealing ring 1 The quick installation of 19 can also make the sealing ring 19 stuck into the groove 2, thereby improving the sealing performance of the sleeve 26 and the pump shaft 1. The design of multiple screws 8 can facilitate the quick installation of the positioning clip 5 and the drive ring 10, so that the overall device can be integrated, and multiple screws 8 can also increase the service life of the screws 8. The main static ring 1 3 and the main static ring 2 14 made of silicon carbide ceramic can reduce the production cost of the overall seal, and at the same time, the polytetrafluoroethylene active ring 15 can be used, which not only has economic cost but also has corrosion resistance to improve practicality.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-cost corrosion-resistant mechanical seal, comprising a pump shaft (1), characterized in that: A groove (2) is provided on the outer side of the pump shaft (1); a main static ring (3) is provided on the outer side of the pump shaft (1); a flange (4) is fixedly installed on the outer side of the main static ring (3) by bolts; a positioning clip (5) is fixedly installed on one side of the flange (4); a liquid inlet assembly (6) is fixedly installed on the outer side of the flange (4); a fixing plate (7) is fixedly installed on one side of the flange (4); a screw (8) is provided on one side of the positioning clip (5); through holes (9) are provided on both sides of the flange (4); two identical through holes (9) are provided, one of which is a liquid inlet and the other is a liquid outlet; a driving ring (10) is fixedly installed on one side of the positioning clip (5); a positioning ring (11), a positioning ring (12) and a positioning ring (13) are fixedly installed on one side of the main static ring (3); and a positioning ring (11), a positioning ring (12) and a positioning ring (13) are fixedly installed on one side of the main static ring (3). A main static ring 2 (14) is fixedly mounted, an active ring (15) is fixedly mounted on the side of the main static ring 2 (14) close to the pump shaft (1), a positioning ring 4 (16) is fixedly mounted on one side of the main static ring 2 (14), a main thrust ring (17) is fixedly mounted on one side of the main static ring 2 (14), a spring (18) is fixedly mounted on the outside of the main thrust ring (17), a sealing ring 1 (19) is fixedly mounted on the outside of the pump shaft (1), a secondary thrust ring (20) is fixedly mounted on the other side of the spring (18), a sealing ring 2 (21) is fixedly mounted on the outside of the secondary thrust ring (20), a main static ring 3 (22) is fixedly mounted on one side of the secondary thrust ring (20), a sealing ring 3 (23) is arranged on one side of the main static ring 3 (22), a sealing ring 4 (25) is fixedly mounted on the outside of the flange (4), and a shaft sleeve (26) is fixedly mounted on one side of the positioning ring 4 (16).

2. A low-cost corrosion-resistant mechanical seal according to claim 1, characterized in that: The liquid inlet component (6) comprises a ferrule (601), a threaded hole (602) is formed on one side of the ferrule (601), a positioning hole (603) is formed on the other side of the ferrule (601), a positioning bolt (604) is penetrated through the positioning hole (603), the ferrule (601) is matched with the positioning clip (5), and the positioning bolt (604) penetrates the positioning hole (603) and the positioning clip (5) and extends to the outside of the ferrule (601).

3. A low-cost corrosion-resistant mechanical seal according to claim 2, characterized in that: The liquid inlet assembly (6) further comprises a connecting sleeve (605) arranged at the top of the threaded hole (602); a liquid inlet pipe (606) is arranged at the top of the connecting sleeve (605); a sealing gasket (607) is fixedly installed on the inner side of the liquid inlet pipe (606); the threaded hole (602) and the connecting sleeve (605) are threadedly connected; the threaded hole (602), the liquid inlet pipe (606) and the through hole (9) are matched.

4. A low-cost corrosion-resistant mechanical seal according to claim 1, characterized in that: The liquid inlet components (6) are provided with two identical ones, and the liquid inlet components (6) correspond to the through holes (9) in a one-to-one manner.

5. A low-cost corrosion-resistant mechanical seal according to claim 1, characterized in that: The positioning ring three (13) is located between the main static ring one (3) and the flange (4), and the positioning ring three (13) is a fluororubber positioning ring.

6. A low-cost corrosion-resistant mechanical seal according to claim 1, characterized in that: The flange (4) is fixedly mounted to the pump cover by means of bolts, and the first positioning ring (11) is located between the flange (4) and the pump cover.

7. A low-cost corrosion-resistant mechanical seal according to claim 1, characterized in that: The active ring (15) is matched with the positioning ring four (16), and the positioning ring four (16) is located outside the shaft sleeve (26).

8. A low-cost corrosion-resistant mechanical seal according to claim 1, characterized in that: The sealing ring 1 (19) is matched with the slot (2), and the other end of the sealing ring 1 (19) is fitted with the shaft sleeve (26).

9. A low-cost corrosion-resistant mechanical seal according to claim 1, characterized in that: The screws (8) are provided in equal numbers, and the plurality of screws (8) are distributed in a ring shape about the center line of the pump shaft (1).

10. A low-cost corrosion-resistant mechanical seal according to claim 1, characterized in that: The main static ring 1 (3) and the main static ring 2 (14) are silicon carbide ceramic main static rings, and the active ring (15) is a polytetrafluoroethylene active ring.

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