Lower side feeding type stirrer for strong alkali medium of settling tank

Abstract

The utility model discloses a settling tank strong alkali medium lower side feeding type stirrer which solves the problems that in the prior art, a strong alkali medium lower side feeding type stirrer is short in service life and inconvenient to maintain and repair. The stirring device comprises a stirring shaft and a mechanical seal, one end of the stirring shaft is connected with stirring blades, the other end of the stirring shaft is connected with a driving assembly, the driving assembly is connected with a shell, a flange extension disc is arranged between the driving assembly and the shell, and the stirring shaft is connected with the shell through the mechanical seal. The stirring shaft is further connected with a cup matched with the mechanical seal, and the cup is matched with the shell. One end of the shell is matched with the flange extension disc, and the other end of the shell is matched with the cup, so that the mechanical seal can be replaced on line under the condition that production is not stopped, the mechanical seal is more suitable for being used under a strong alkali medium, and the daily maintenance frequency is reduced; the device is convenient to disassemble.

Description

Technical Field

[0001] The utility model relates to the technical field of stirrers, in particular to a side-entry stirrer for a strong alkaline medium in a sedimentation tank. Background Art

[0002] The side-entry mixer is a mixer that installs the stirring device on the side wall of the equipment barrel. The agitator on the mixer usually adopts an axial flow type, and most of them are propeller agitators. Under the condition of consuming the same power, the highest stirring effect can be obtained. The power consumption is only 1 / 3~2 / 3 of the top stirring, and the cost is only 1 / 4~1 / 3 of the top stirring. The speed can be 200~750r / min. It is widely used in desulfurization, denitrification and stirring of various large storage tanks or tanks. In particular, one or more side-entry mixers are used together in large storage tanks or tanks, and good stirring effects can be obtained under low energy consumption. When the side-entry mixer is repaired or replaced, it mainly replaces and repairs the mechanical seal. Specifically, the power supply of the mixer needs to be cut off to ensure safety. Disassemble the outer shell of the mixer to expose the details of the machine. Find the location of the old seal and remove the screws that fix the seal with a wrench. Pick up the old seal and confirm that it has been completely disassembled. Clean the worn parts and check the shaft and body of the agitator to see if there is obvious wear or a lot of rust. If necessary, maintain or replace key parts. In the strong alkaline medium of the sedimentation tank, the agitator stirs and rotates for mixing and adjustment. However, under strong alkaline conditions, the mechanical seal is prone to crystallization and wear, which reduces the service life. Secondly, the repair of the agitator often requires the agitator to be disassembled from the tank body, which is time-consuming and complicated, and the mechanical seal cannot be replaced online. Utility Model Content

[0003] In view of the deficiencies in the above-mentioned background technology, the utility model proposes a side-entry agitator for strong alkaline medium in a sedimentation tank, which solves the problems of short service life and inconvenience in online replacement of mechanical seals of side-entry agitators for strong alkaline medium in the prior art.

[0004] The technical solution of the utility model is achieved as follows: a side-entry agitator for a strong alkaline medium in a sedimentation tank comprises a stirring shaft and a mechanical seal, one end of the stirring shaft is connected to a stirring blade, the other end of the stirring shaft is connected to a driving assembly, the driving assembly is connected to a housing, a flange extension plate is provided between the driving assembly and the housing, the stirring shaft is connected to the housing through a mechanical seal, the stirring shaft is also connected to a cover cup that cooperates with the mechanical seal, and the cover cup cooperates with the housing.

[0005] Furthermore, the mechanical seal includes a sleeve mounted on the agitator shaft and a connecting flange connected to the outer shell, the connecting flange is rotatably connected to the agitator shaft, the sleeve is provided with a locking sleeve for detachably connecting to the agitator shaft, a dynamic and static ring group and an alloy dynamic and static ring group are provided between the sleeve and the connecting flange, the dynamic and static ring group is connected to the outer end of the connecting flange, the alloy dynamic and static ring group is connected to the inside of the connecting flange, the sleeve and the connecting flange form an isolation chamber through the dynamic and static ring group and the alloy dynamic and static ring group, the connecting flange is provided with a flushing inlet and a flushing outlet cooperating with the isolation chamber, and the flushing inlet and the flushing outlet are located in the outer shell.

[0006] Furthermore, the dynamic and static ring group includes a dynamic ring and a static ring, the dynamic ring is installed on the shaft sleeve, the static ring is installed on the connecting flange, and an alloy spring is provided between the static ring and the connecting flange.

[0007] Furthermore, the alloy dynamic and static rings include an alloy dynamic ring and an alloy static ring, the alloy dynamic ring is installed on the shaft sleeve, the alloy dynamic ring is dynamically sealed to the alloy static ring, the alloy static ring is installed on the connecting flange, and an alloy spring 2 is provided between the alloy static ring and the connecting flange.

[0008] Furthermore, a locking hole is provided on the alloy dynamic ring, and a positioning piece is detachably connected in the locking hole. The positioning piece is connected to the connecting flange by screws when in use.

[0009] Furthermore, a first sealing ring is provided between the dynamic ring and the sleeve, a second sealing ring is provided between the static ring and the connecting flange, a third sealing ring is provided between the alloy static ring and the connecting flange, and a fourth sealing ring is provided between the alloy dynamic ring and the sleeve.

[0010] Furthermore, the shell includes a cylinder and a mounting plate, one end of the cylinder is connected to the flange, and the other end of the cylinder is connected to the mounting plate, and a sealing seat cooperating with the mechanical seal is provided on the mounting plate.

[0011] Furthermore, one end of the cup is fixedly mounted on the stirring shaft, and the other end of the cup is connected to the shaft sleeve. The cup is provided with a sealing cone surface, which corresponds to the inspection surface on the sealing seat.

[0012] Furthermore, the flange extension is a necked butt-welding flange, a necked side of the necked butt-welding flange is internally connected to the housing, and a flat end face of the necked butt-welding flange is connected to the driving assembly.

[0013] Furthermore, the driving assembly includes a driving motor and a reducer, the output end of the driving motor is connected to the input end of the reducer through a transmission belt group, the output end of the reducer is connected to the stirring shaft through a coupling, and the flange is connected to the reducer.

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

[0015] 1. The utility model has a mechanical seal connected between the stirring shaft and the housing, and the stirring blades, mechanical seal and driving assembly are respectively located at the front, middle and rear positions of the stirring shaft. The front end of the housing cooperates with the stirring shaft through the mechanical seal to ensure the rotation of the stirring shaft, which is more suitable for the driving assembly to drive the stirring blades to rotate stably through the stirring shaft, thereby stirring the liquid in the countersunk tank with strong alkali medium. One end of the housing cooperates with the flange extension disc and the other end cooperates with the cover cup, so that the mechanical seal can be replaced online without stopping production, which is more suitable for use under strong alkali medium, reducing the number of daily maintenance times and making the device easy to disassemble. Online replacement saves maintenance time and solves the problems of low service life of side-entry agitators under strong alkali medium and inability to replace mechanical seals online in the prior art.

[0016] 2. The mechanical seal adopts two dynamic sealing structures, namely the dynamic and static ring group and the alloy dynamic and static ring group, which doubly ensures the isolation of the strong alkaline medium and improves the sealing performance of the mechanical seal. A positioning piece is provided on the alloy dynamic and static ring to fix the alloy dynamic ring, so that the alloy dynamic ring is connected to the connecting flange as a whole, which is easy to disassemble.

[0017] 3. The cover is provided with a sealing cone surface, which corresponds to the inspection surface and can be used to connect the shell and the cover cup. The mechanical seal can be replaced online without stopping production, and the normal operation of the positive agitator will not be affected.

[0018] 4. The flange extension plate adopts a necked butt-welded flange, and the neck side of the necked butt-welded flange is internally connected to the shell. After the shell and the flange extension plate are disassembled, the neck side can provide support for the shell, withdraw the connecting flange backwards, and drive the separation of the coupling and the stirring shaft, which can save the manual assistance process during the disassembly process and is convenient for disassembly, solving the problems of inconvenient disassembly of the existing shell and drive components and complicated shell disassembly during maintenance and overhaul. 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 for Figure 1 A partial enlarged schematic diagram in the middle.

[0022] In the figure: 1, driving motor, 2, transmission belt group, 3, reducer, 4, flange extension plate, 5, coupling, 6, cylinder, 7, mounting plate, 8, sealing seat, 9, cup, 10, stirring shaft, 11, stirring blade, 12, sleeve, 13, moving ring, 14, static ring, 15, connecting flange, 16 alloy static ring, 17, alloy moving ring, 18, positioning piece, 19, locking sleeve, 20, bearing, 21, end cover, 22, first sealing ring, 23, second sealing ring, 24, third sealing ring, 25, fourth sealing ring, 26, flushing inlet, 27, flushing outlet. 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 2 As shown, in Example 1, a side-entry stirrer for a strong alkaline medium in a sedimentation tank comprises a stirring shaft 10 and a mechanical seal, one end of the stirring shaft 10 is connected to a stirring blade 11, the other end of the stirring shaft 10 is connected to a driving assembly, a housing is connected to the driving assembly, and a flange extension plate 4 is provided between the driving assembly and the housing, the stirring shaft 10 is connected to the housing through a mechanical seal, and a cup 9 matched with the mechanical seal is also connected to the stirring shaft 10, and the cup 9 matches with the housing. The mechanical seal is connected between the stirring shaft and the housing, and the stirring blade, the mechanical seal and the driving assembly are respectively located at the front, middle and rear positions of the stirring shaft, and the front end of the housing matches with the stirring shaft through the mechanical seal to ensure the rotation of the stirring shaft, which is more suitable for the driving assembly to drive the stirring blade to rotate stably through the stirring shaft, and then stir the liquid in the strong alkaline medium tank of the sink tank. One end of the housing matches with the flange extension plate and the other end matches with the cup, so that the mechanical seal can be replaced online without stopping production, which is more suitable for use under strong alkaline medium, reducing the number of daily maintenance; and the device is easy to disassemble. Online replacement is performed to save maintenance time, and the problems of low service life of the side-entry agitator under strong alkaline media and inability to realize online replacement of mechanical seals in the prior art are solved.

[0025] like Figure 1 and Figure 2As shown, Example 2 is a side-entry agitator for strong alkaline medium in a sedimentation tank. The difference from the technical solution of Example 1 is that the mechanical seal includes a sleeve 12 sleeved on the agitator shaft 10 and a connecting flange 15 connected to the shell. The connecting flange 15 is rotatably connected to the agitator shaft 10. The sleeve 12 is provided with a locking sleeve 19 for detachably connecting to the agitator shaft 10. A dynamic and static ring group and an alloy dynamic and static ring group are provided between the sleeve 12 and the connecting flange 15. The dynamic and static ring group is connected to the outer end of the connecting flange 15, and the alloy dynamic and static ring group is connected to the inside of the connecting flange 15. The sleeve 12 and the connecting flange 15 form an isolation chamber through the dynamic and static ring group and the alloy dynamic and static ring group. The connecting flange 15 is provided with a flushing inlet 26 and a flushing outlet 27 that cooperate with the isolation chamber, and the flushing inlet 26 and the flushing outlet 27 are located in the shell. The flushing inlet 26 is located at the upper part of the agitator shaft 10, and the flushing outlet 27 is located at the lower part of the agitator shaft 10, which is convenient for water in and out. The isolation chamber can be used to isolate the crystallized strong alkaline medium to prevent the strong alkaline medium from entering the housing and affecting the connection between the driving component and the stirring shaft 10, thereby ensuring the stability of the device connection.

[0026] In this embodiment, the dynamic and static ring group includes a dynamic ring 13 and a static ring 14. The dynamic ring 13 is mounted on the shaft sleeve 12, and the static ring 14 is mounted on the connecting flange 15. The connecting flange 15 is also provided with a bearing 20. The bearing 20 is sleeved on the stirring shaft 10 and is located in the housing. The connecting flange is provided with a bearing end cover 21 for sealing the bearing. And an alloy spring 1 is provided between the static ring 14 and the connecting flange 15. The alloy dynamic and static ring 14 includes an alloy dynamic ring 17 and an alloy static ring 16. The alloy dynamic ring 17 is mounted on the shaft sleeve 12. The alloy dynamic ring 17 is dynamically sealed with the alloy static ring 16. The alloy static ring 16 is mounted on the connecting flange 15, and an alloy spring 2 is provided between the alloy static ring 16 and the connecting flange 15. The alloy spring 1 and the alloy spring 2 are used to promote the connection between the dynamic and static ring group and the alloy dynamic and static ring group. The alloy dynamic ring 17 is provided with a locking hole, and a positioning piece 18 is detachably connected in the locking hole. The positioning piece 18 is connected to the connecting flange 15 by screws when in use. A first sealing ring 22 is provided between the dynamic ring 13 and the sleeve 12, a second sealing ring 23 is provided between the static ring 14 and the connecting flange 15, a third sealing ring 24 is provided between the alloy static ring 16 and the connecting flange 15, and a fourth sealing ring 25 is provided between the alloy dynamic ring 17 and the sleeve 12. The mechanical seal adopts two dynamic sealing structures, namely, a dynamic and static ring group and an alloy dynamic and static ring group, which doubly ensures the isolation of the strong alkaline medium and improves the sealing performance of the mechanical seal. A positioning sheet 18 is provided on the alloy dynamic and static ring 14 to fix the alloy dynamic ring 17, so that the alloy dynamic ring 17 and the connecting flange 15 are connected as a whole, which is convenient for disassembly.

[0027] like Figure 1 and Figure 2As shown, Example 3 is a side-entry agitator for strong alkaline medium in a sedimentation tank. The difference from the technical solution of Example 1 is that the shell includes a cylinder 6 and a mounting plate 7. One end of the cylinder 6 is connected to the flange extension plate 4, and the other end of the cylinder 6 is connected to the mounting plate 7. The mounting plate 7 is provided with a sealing seat 8 that cooperates with the mechanical seal. The flange extension plate adopts a necked butt-welded flange, and the neck side of the necked butt-welded flange is internally connected to the shell. After the shell and the flange extension plate are disassembled, the neck side can provide support for the shell, which can save the process of manual assistance during the disassembly process, and is easy to disassemble, solving the problems of inconvenient disassembly of the existing shell and drive assembly and complicated shell disassembly during maintenance and overhaul. The connecting flange is withdrawn backward to drive the separation of the coupling and the agitator shaft.

[0028] In this embodiment, one end of the cup 9 is fixedly mounted on the stirring shaft 10, and the other end of the cup 9 is connected to the shaft sleeve 12, and a sealing cone surface is provided on the cup 9, and the sealing cone surface corresponds to the inspection cone surface on the sealing seat 8. The flange extension plate 4 is a necked butt-welding flange, and the neck side of the necked butt-welding flange is internally connected to the outer shell, and the flat section of the necked butt-welding flange is connected to the driving assembly. The cover is provided with a sealing cone surface, and the sealing cone surface corresponds to the inspection surface, which can be used to connect the outer shell with the cup 9, thereby facilitating the inspection or replacement of the mechanical seal. The cup 9 is made of pressureless sintered silicon carbide material with good alkali resistance, and a sealing ring can be provided on the sealing end face to correspond to the inspection cone surface, which can further enhance the sealing during inspection and facilitate disassembly.

[0029] In this embodiment, the driving assembly includes a driving motor 1 and a reducer 3, the output end of the driving motor 1 is connected to the input end of the reducer 3 through a transmission belt set 2, the output end of the reducer 3 is connected to the stirring shaft 10 through a coupling 5, and the flange extension plate 4 is connected to the reducer. The output end of the driving motor 1 is connected to a driving pulley, and the input end of the reducer 3 is connected to a driven pulley, and the driving pulley and the driven pulley are connected through a transmission belt.

[0030] 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 side-entry agitator for a sedimentation tank with a strong alkaline medium, characterized in that: The invention comprises a stirring shaft (10) and a mechanical seal, wherein one end of the stirring shaft (10) is connected to a stirring blade (11), the other end of the stirring shaft (10) is connected to a driving assembly, the driving assembly is connected to a housing, a flange extension plate (4) is provided between the driving assembly and the housing, the stirring shaft (10) is connected to the housing via the mechanical seal, the stirring shaft (10) is also connected to a cover cup (9) matched with the mechanical seal, and the cover cup (9) is matched with the housing.

2. The side-entry agitator for strong alkaline medium in the sedimentation tank according to claim 1, characterized in that: The mechanical seal comprises a shaft sleeve (12) sleeved on the stirring shaft (10) and a connecting flange (15) connected to the housing, the connecting flange (15) being rotatably connected to the stirring shaft (10), the shaft sleeve (12) being provided with a locking sleeve (19) for detachably connecting to the stirring shaft (10), a dynamic and static ring group and an alloy dynamic and static ring group being provided between the shaft sleeve (12) and the connecting flange (15), the dynamic and static ring group being provided at the outer end of the connecting flange (15), the alloy dynamic and static ring group being provided inside the connecting flange (15), the shaft sleeve (12) and the connecting flange (15) forming an isolation chamber through the dynamic and static ring group and the alloy dynamic and static ring group, the connecting flange (15) being provided with a flushing inlet (26) and a flushing outlet (27) cooperating with the isolation chamber, and the flushing inlet (26) and the flushing outlet (27) being located inside the housing.

3. The side-entry agitator for strong alkaline medium in the sedimentation tank according to claim 2, characterized in that: The dynamic and static ring assembly comprises a dynamic ring (13) and a static ring (14); the dynamic ring (13) is mounted on the shaft sleeve (12); the static ring (14) is mounted on the connecting flange (15); and an alloy spring is provided between the static ring (14) and the connecting flange (15).

4. The side-entry agitator for strong alkaline medium in the sedimentation tank according to claim 3, characterized in that: The alloy dynamic and static rings (14) comprise an alloy dynamic ring (17) and an alloy static ring (16); the alloy dynamic ring (17) is mounted on the shaft sleeve (12); the alloy dynamic ring (17) and the alloy static ring (16) are dynamically sealed; the alloy static ring (16) is mounted on the connecting flange (15); and an alloy spring 2 is provided between the alloy static ring (16) and the connecting flange (15).

5. The side-entry agitator for strong alkaline medium in a sedimentation tank according to claim 4, characterized in that: The alloy dynamic ring (17) is provided with a locking hole, in which a positioning piece (18) is detachably connected. When in use, the positioning piece (18) is connected to the connecting flange (15) via screws.

6. The side-entry agitator for strong alkaline medium in the sedimentation tank according to claim 5, characterized in that: A first sealing ring (22) is provided between the dynamic ring (13) and the shaft sleeve (12), a second sealing ring (23) is provided between the static ring (14) and the connecting flange (15), a third sealing ring (24) is provided between the alloy static ring (16) and the connecting flange (15), and a fourth sealing ring (25) is provided between the alloy dynamic ring (17) and the shaft sleeve (12).

7. The side-entry agitator for the strong alkaline medium in the sedimentation tank according to any one of claims 2 to 6, characterized in that: The housing comprises a cylinder (6) and a mounting plate (7), one end of the cylinder (6) is connected to the flange extension plate (4), the other end of the cylinder (6) is connected to the mounting plate (7), and a sealing seat (8) cooperating with a mechanical seal is provided on the mounting plate (7).

8. The side-entry agitator for strong alkaline medium in a sedimentation tank according to claim 7, characterized in that: One end of the cup (9) is fixedly mounted on the stirring shaft (10), and the other end of the cup (9) is connected to the shaft sleeve (12). The cup (9) is provided with a sealing cone surface, which corresponds to the inspection surface on the sealing seat (8).

9. The side-entry agitator for strong alkaline medium in a sedimentation tank according to claim 8, characterized in that: The flange extension plate (4) is a necked butt-welding flange, the neck side of which is internally connected to the housing, and the flat end surface of which is connected to the driving component.

10. The side-entry agitator for strong alkaline medium in a sedimentation tank according to claim 9, characterized in that: The driving assembly comprises a driving motor (1) and a reducer (3); the output end of the driving motor (1) is connected to the input end of the reducer (3) via a transmission belt assembly (2); the output end of the reducer (3) is connected to the stirring shaft (10) via a coupling (5); and the flange extension plate (4) is connected to the reducer (3).

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