Double-end-face mechanical seal of stirrer under strong alkali medium

Abstract

The utility model discloses a stirrer double-end-face mechanical seal under strong alkali media, which comprises a shaft sleeve and a flange, an inner ring of the shaft sleeve is sleeved on a main shaft, one end of an inner ring of the flange is matched with the main shaft, the other end of the inner ring of the flange is in running fit with the shaft sleeve, and a locking limit piece matched with the shaft sleeve is further arranged in the flange. A movable-static ring set and an alloy movable-static ring set are arranged between the flange and the shaft sleeve, the flange and the shaft sleeve form an isolation cavity through the movable-static ring set and the alloy movable-static ring set, and the flange is provided with a flushing inlet and a flushing outlet which are communicated with the isolation cavity. Sealing connection between the shaft sleeve and the flange is achieved through cooperation of the movable and static ring set and the alloy movable and static ring set, the isolation effect on strong alkali is good, a formed isolation cavity is matched with a flushing inlet and a flushing outlet in the flange to facilitate crystal cleaning, a locking positioning piece matched with the shaft sleeve is arranged in the flange, fixing and dismounting of the shaft sleeve are facilitated, the structure is simple, and the cost is low. The disassembly is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical seals, in particular to a double-end surface mechanical seal for a stirrer under strong alkaline medium. Background Art

[0002] The dynamic and static ring group is an important fluid sealing device, which is widely used in various mechanical equipment. It achieves close fitting of the sealing surface through precise geometric design and material selection, effectively preventing fluid leakage. The dynamic and static ring group has the characteristics of high reliability, long life and low maintenance, and is an indispensable sealing solution in the industrial field. The principle of double-end mechanical seal is basically the same as that of single-end dynamic and static ring group. Both are devices to prevent fluid leakage by maintaining the end face (friction pair) perpendicular to the main axis of the rotation under the action of fluid pressure and the elastic force of the compensation mechanism and the cooperation of auxiliary seals to maintain fit and relative sliding. The dynamic and static ring group used under strong alkaline conditions has a strong corrosive medium. During the operation of the dynamic and static ring group, crystals and solids are generated on the sealing end face, which can easily affect the life of the dynamic and static ring group. In addition, under strong alkaline conditions, the crystals of the dynamic and static ring group are difficult to clean, and the dynamic and static ring group is not easy to disassemble. In order to prevent the corrosion of the sealing elastic element by the medium, the sealing structure should be cleaned regularly, and the dynamic and static ring group also needs to be regularly maintained. Existing detachable seals mostly adopt an external structure, and the arrangement method is back-to-back or face-to-face dynamic and static ring groups, that is, there are two pairs of friction pairs in each set of container seals. The existing dynamic and static ring groups are inconvenient to disassemble and it is not convenient to repair and replace the sealing structure. Utility Model Content

[0003] In view of the deficiencies in the above-mentioned background technology, the utility model proposes a double-end mechanical seal for an agitator under strong alkaline medium, which solves the problem in the prior art that the dynamic and static ring groups are inconvenient to disassemble and the dynamic and static ring groups are difficult to clean in the strong alkaline condition.

[0004] The technical solution of the utility model is achieved as follows: a double-end mechanical seal for an agitator under a strong alkaline medium, comprising a shaft sleeve and a flange, an inner ring of the shaft sleeve being sleeved on a main shaft, one end of the inner ring of the flange cooperating with the main shaft, and the other end of the inner ring of the flange cooperating with the shaft sleeve for rotation, a locking limiter cooperating with the shaft sleeve being further provided in the flange, a dynamic and static ring group and an alloy dynamic and static ring group being provided between the flange and the shaft sleeve, an isolation chamber being formed between the flange and the shaft sleeve through the dynamic and static ring group and the alloy dynamic and static ring group, and a flushing inlet and a flushing outlet being connected with the isolation chamber being provided on the flange.

[0005] Furthermore, the dynamic and static ring group includes a static ring and a dynamic ring. An alloy spring is provided at one end of the static ring, which is pressed against the flange. The other end of the static ring is in contact with the dynamic ring. The dynamic ring is installed on the sleeve and rotates with the sleeve.

[0006] Furthermore, a first sealing ring is provided between the stationary ring and the flange, and a groove matching with the alloy spring is provided on the stationary ring.

[0007] Furthermore, a second sealing ring is provided between the moving ring and the shaft sleeve.

[0008] Furthermore, the alloy dynamic and static ring assembly includes an alloy dynamic ring and an alloy static ring, the alloy static ring is fixedly mounted on the flange, one side of the alloy static ring is in contact with the alloy dynamic ring, and the alloy dynamic ring is fixed on the shaft sleeve and rotates with the shaft sleeve.

[0009] Furthermore, a third sealing ring is provided between the alloy static ring and the flange, and a hard alloy contact block 1 is provided on the side where the alloy static ring contacts the alloy dynamic ring.

[0010] Furthermore, a fourth sealing ring is provided between the alloy dynamic ring and the shaft sleeve, and a hard alloy contact block 2 cooperating with the hard alloy contact block 1 is provided on the alloy dynamic ring.

[0011] Furthermore, the locking limiter includes a positioning piece and a positioning sleeve. When in use, the positioning sleeve is arranged on the shaft sleeve. When the shaft sleeve is installed or removed, the positioning block passes through the installation hole of the alloy dynamic ring and is plugged into the positioning hole arranged on the shaft sleeve.

[0012] Furthermore, a retaining spring for limiting the alloy dynamic and static ring group is also installed on the shaft sleeve.

[0013] Furthermore, a bearing is connected to the flange, and the bearing is restricted on the flange by an end cover mounted on the flange, and an inner ring of the bearing cooperates with the main shaft.

[0014] The beneficial effects of the utility model are:

[0015] 1. The utility model adopts a dynamic and static ring group and an alloy dynamic and static ring group to achieve a sealed connection between the shaft sleeve and the flange, which has a good isolation effect on strong alkali, and the isolation cavity formed cooperates with the flushing inlet and flushing outlet on the flange to facilitate the cleaning of crystals. A locking positioning piece that cooperates with the shaft sleeve is arranged in the flange to facilitate the fixing and disassembly of the shaft sleeve, and the structure is simple and easy to disassemble.

[0016] 2. The dynamic and static ring group is in contact with a strong alkaline environment, which can easily lead to crystallization in the isolation chamber during use. Therefore, it is necessary to flush the isolation chamber with the flushing inlet and flushing outlet to ensure the service life of the device and avoid corrosion or affect the use effect. The alloy dynamic and static ring group further ensures the sealing, improves the wear resistance of the dynamic and static ring group, and further avoids damage and failure of the device.

[0017] 3. In the alloy dynamic and static ring group, the contact between the alloy static ring and the alloy dynamic ring is released by the hard alloy block, which further ensures the service life of the alloy dynamic and static ring group, and also avoids the damage of the dynamic and static ring group or the alloy dynamic and static ring group by high-pressure water when flushing the isolation chamber.

[0018] 4. The locking limiter adopts a positioning sleeve or a positioning plate. The positioning sleeve can be used to fix the shaft sleeve on the main shaft to ensure the stability of the shaft sleeve connection. The positioning plate has a simple fixing method, is convenient for installation and use of the device, has a fast installation speed, and improves the efficiency of installation and disassembly of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of the utility model.

[0021] Figure 2 It is a side view of the utility model.

[0022] In the figure: 1. main shaft, 2. end cover, 3. bearing, 4. flange, 5. positioning sleeve, 6. retaining ring, 7. alloy dynamic ring, 8. alloy static ring, 9. positioning plate, 10. flushing inlet, 11. alloy spring, 12. first sealing ring, 13. static ring, 14. dynamic ring, 15. second sealing ring, 16. shaft sleeve, 17. flushing outlet, 18. third sealing ring, 19. fourth sealing ring. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] like Figure 1 and Figure 2As shown, embodiment 1 is a double-end mechanical seal for a stirrer under a strong alkali medium, comprising a sleeve 16 and a flange 4, wherein the inner ring of the sleeve 16 is sleeved on the main shaft 1, one end of the inner ring of the flange 4 cooperates with the main shaft 1, and the other end of the inner ring of the flange 4 rotates with the sleeve 16, and a locking stopper cooperating with the sleeve 16 is also provided in the flange 4, and a dynamic and static ring group and an alloy dynamic and static ring group are provided between the flange 4 and the sleeve 16, and the flange 4 and the sleeve 16 form an isolation chamber through the dynamic and static ring group and the alloy dynamic and static ring group, and a flushing inlet 10 and a flushing outlet 17 communicating with the isolation chamber are provided on the flange 4. The utility model adopts the dynamic and static ring group and the alloy dynamic and static ring group to achieve a sealing connection between the sleeve 16 and the flange 4, and has a good isolation effect on strong alkali, and the isolation chamber formed cooperates with the flushing inlet 10 and the flushing outlet 17 on the flange 4 to facilitate the cleaning of crystals, and a locking positioner cooperating with the sleeve 16 is provided in the flange 4, which is convenient for fixing and disassembling the sleeve 16, and has a simple structure and is easy to disassemble. The dynamic and static ring group is in contact with a strong alkaline environment, which can easily lead to crystallization in the isolation chamber during use. Therefore, it is necessary to cooperate with the flushing inlet 10 and the flushing outlet 17 to flush the isolation chamber to ensure the service life of the device and avoid corrosion of the device or affect the use effect. The alloy dynamic and static ring group further ensures the sealing, improves the wear resistance of the dynamic and static ring group, and further avoids damage and failure of the device.

[0025] like Figure 1 and Figure 2 As shown, Example 2 is a double-end mechanical seal for a stirrer under strong alkaline medium, wherein the static and dynamic ring group includes a static ring 13 and a dynamic ring 14, one end of the static ring 13 is provided with an alloy spring 11, the alloy spring 11 is pressed against the flange 4, the other end of the static ring 13 is in contact with the dynamic ring 14, and the dynamic ring 14 is mounted on the shaft sleeve 16 and rotates with the shaft sleeve 16. A first sealing ring 12 is provided between the static ring 13 and the flange 4, and a groove is provided on the static ring 13 to cooperate with the alloy spring 11. The first sealing ring 12 is used to ensure the sealing connection between the static ring 13 and the flange 4, and to ensure the sealing of the static ring 13. A second sealing ring 15 is provided between the dynamic ring 14 and the shaft sleeve 16. Both the first sealing ring 12 and the second sealing ring 15 are preferably EPDM rubber rings, which have high elasticity, good sealing effect, and are suitable for sealing in strong alkaline environments.

[0026] In this embodiment, the alloy dynamic and static ring group includes an alloy dynamic ring 7 and an alloy static ring 13. The alloy static ring 13 is fixedly mounted on the flange 4. One side of the alloy static ring 13 contacts the alloy dynamic ring 7. The alloy dynamic ring 7 is fixed on the shaft sleeve 16 and rotates with the shaft sleeve 16. A third sealing ring 18 is provided between the alloy static ring 13 and the flange 4. The alloy static ring 13 contacts the flange 4 through the third sealing ring 18. The alloy static ring 13 is an L-shaped structure that matches the flange 4. An alloy spring 11 is provided between the L-shaped structure and the flange 4 to ensure the sealed contact between the alloy static ring 13 and the alloy dynamic ring 7. A hard alloy contact block 1 is provided on the side of the alloy static ring 13 that contacts the alloy dynamic ring 7. A fourth sealing ring 19 is provided between the alloy dynamic ring 7 and the shaft sleeve 16. A hard alloy contact block 2 that matches the hard alloy contact block 1 is provided on the alloy dynamic ring 7. The alloy dynamic ring 7 and the alloy static ring 13 are preferably made of stainless steel alloy. The alloy dynamic ring 7 and the hard alloy contact block 2 are welded into an integrated structure, and the alloy static ring 13 and the hard alloy contact block 1 are welded into an integrated structure. The alloy dynamic ring 7 and the alloy static ring 13 are directly in contact with each other through the hard alloy contact block 1 and the hard alloy contact block 2 to form a dynamic seal. In the alloy dynamic and static ring group, the contact between the alloy static ring 13 and the alloy dynamic ring 7 is released by the hard alloy block, which further ensures the service life of the alloy dynamic and static ring group, and also avoids the damage of the dynamic and static ring group or the alloy dynamic and static ring group by high-pressure water when flushing the isolation chamber.

[0027] The other structures are the same as those in Example 1.

[0028] like Figure 1 and Figure 2 As shown, Example 3 is a double-end mechanical seal for an agitator under a strong alkaline medium, wherein the locking limiter includes a positioning piece 9 and a positioning sleeve 5. When in use, the positioning sleeve 5 is sleeved on the shaft sleeve 16. When the shaft sleeve 16 is installed or removed, the positioning block passes through the mounting hole of the alloy dynamic ring 7 and is plugged into the positioning hole provided on the shaft sleeve 16. The positioning piece 9 and the positioning sleeve 5 are not used at the same time. The positioning piece 9 is used for disassembling and assembling the mechanical seal, and the positioning sleeve 5 is used for fixing the shaft sleeve 16 mechanical seal on the main shaft 1. When the positioning piece 9 is matched with the mounting hole on the alloy dynamic ring 7, the positioning piece 9 is fixed to the flange 4 by screws, thereby realizing the fixation between the alloy dynamic ring 7 and the flange 4, and finally completing the position locking between the shaft sleeve 16 and the flange 4, avoiding the rotation between the shaft sleeve 16 and the flange 4 during disassembly, and the disassembly is more convenient and stable. The locking limiter adopts a positioning sleeve 5 or a positioning plate 9. The positioning sleeve 5 can be used to fix the shaft sleeve 16 on the main shaft 1 to ensure the stability of the connection of the shaft sleeve 16. The positioning plate 9 is used, the fixing method is simple, and the installation and use of the device are convenient, the installation speed is fast, and the efficiency of installation and disassembly of the device is improved.

[0029] In this embodiment, a retaining spring 6 for limiting the alloy dynamic and static ring group is also installed on the shaft sleeve 16. The retaining spring 6 is used to limit the alloy dynamic ring 7 to the shaft sleeve 16. The retaining spring 6 and the shaft sleeve 16 are interference fit to ensure the sealed contact between the alloy dynamic ring 7 and the alloy static ring 13. The flange 4 is connected to the bearing 3, and the bearing 3 is limited to the flange 4 through the end cover 2 installed on the flange 4. The inner ring of the bearing 3 is matched with the main shaft. The flange 4 is rotatably connected to the main shaft 1 through the bearing 3, and is used to fix the flange 4 on the main shaft 1.

[0030] The other structures are the same as those in Example 2.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-end mechanical seal for a stirrer in a strong alkaline medium, characterized by: The invention comprises a shaft sleeve (16) and a flange (4), wherein an inner ring of the shaft sleeve (16) is sleeved on a main shaft (1), one end of the inner ring of the flange (4) cooperates with the main shaft (1), and the other end of the inner ring of the flange (4) is rotationally cooperated with the shaft sleeve (16), a locking stopper cooperating with the shaft sleeve (16) is also provided in the flange (4), a dynamic and static ring group and an alloy dynamic and static ring group are provided between the flange (4) and the shaft sleeve (16), an isolation chamber is formed between the flange (4) and the shaft sleeve (16) through the dynamic and static ring group and the alloy dynamic and static ring group, and a flushing inlet (10) and a flushing outlet (17) communicated with the isolation chamber are provided on the flange (4).

2. The double-end mechanical seal for agitator in strong alkaline medium according to claim 1 is characterized in that: The static and dynamic ring assembly comprises a static ring (13) and a dynamic ring (14); one end of the static ring (13) is provided with an alloy spring (11), the alloy spring (11) is pressed against the flange (4); the other end of the static ring (13) is in contact with the dynamic ring (14), and the dynamic ring (14) is mounted on the shaft sleeve (16) and rotates with the shaft sleeve (16).

3. The double-end mechanical seal for agitator in strong alkaline medium according to claim 2 is characterized in that: A first sealing ring (12) is provided between the stationary ring (13) and the flange (4), and a groove matching the alloy spring (11) is provided on the stationary ring (13).

4. The double-end mechanical seal for agitator in strong alkaline medium according to claim 3 is characterized by: A second sealing ring (15) is provided between the moving ring (14) and the shaft sleeve (16).

5. The double-end mechanical seal for agitator in strong alkaline medium according to any one of claims 2 to 4, characterized in that: The alloy dynamic and static ring assembly comprises an alloy dynamic ring (7) and an alloy static ring (8); the alloy static ring (8) is fixedly mounted on the flange (4); one side of the alloy static ring (8) is in contact with the alloy dynamic ring (7); and the alloy dynamic ring (7) is fixed on the shaft sleeve (16) and rotates with the shaft sleeve (16).

6. The double-end mechanical seal for agitator in a strong alkaline medium according to claim 5, characterized in that: A third sealing ring (18) is provided between the alloy static ring (8) and the flange (4), and a hard alloy contact block 1 is provided on the side of the alloy static ring (8) that contacts the alloy dynamic ring (7).

7. The double-end mechanical seal for agitator in strong alkaline medium according to claim 6, characterized in that: A fourth sealing ring (19) is provided between the alloy dynamic ring (7) and the shaft sleeve (16), and a hard alloy contact block 2 cooperating with the hard alloy contact block 1 is provided on the alloy dynamic ring (7).

8. The double-end mechanical seal for agitator in strong alkaline medium according to claim 6 or 7, characterized in that: The locking and limiting member comprises a positioning piece (9) and a positioning sleeve (5); when in use, the positioning sleeve (5) is sleeved on the shaft sleeve (16); when the shaft sleeve (16) is installed or removed, the positioning block passes through the installation hole of the alloy dynamic ring (7) and is plugged into and matched with the positioning hole provided on the shaft sleeve (16).

9. The double-end mechanical seal for agitator in strong alkaline medium according to claim 8, characterized in that: A retaining spring (6) for restricting the alloy dynamic and static ring group is also installed on the shaft sleeve (16).

10. The double-end mechanical seal for a stirrer in a strong alkaline medium according to any one of claims 1 to 4, 6, 7 and 9, characterized in that: The flange (4) is connected to a bearing (3), the bearing (3) is restricted on the flange (4) by an end cover (2) mounted on the flange (4), and the inner ring of the bearing (3) is matched with the main shaft (1).

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