Magnetic liquid sealing device for vertical stirrer

Abstract

The utility model relates to the technical field of sealing structures, and discloses a magnetic liquid sealing device for a vertical stirrer, which comprises an outer shell, a permanent magnet is mounted in the middle of the inner side wall of the outer shell, and pole shoes are mounted on two sides, close to the permanent magnet, of the inner side wall of the outer shell. Pole teeth are arranged at the positions, close to the pole shoes, of the outer side of the rotating shaft, the positions between the pole teeth and the magnetic fluid grooves are filled with magnetic liquid, and spiral water grooves are formed in the positions, close to the permanent magnets and the pole shoes, of the interior of the side wall of the outer shell. And a plurality of radiating fins are arranged at positions, close to the permanent magnets and the pole shoes, outside the side wall of the outer shell. Cooling liquid is injected into the spiral water tank through the water inlet, takes away heat in the permanent magnet and the pole shoe and then is discharged from the water outlet, the temperature of magnetic liquid is effectively prevented from being too high, the heat of the permanent magnet and the pole shoe can be dissipated through the heat dissipation fins, and the situation that the viscosity of the magnetic liquid is reduced due to temperature rise is avoided. And the sealing performance is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing structures, in particular to a magnetic liquid sealing device for a vertical stirrer. Background Art

[0002] Vertical electric agitator can mix liquid or gas evenly by rotating the stirring blades to achieve various purposes, such as chemical reaction, dissolution, dispersion, suspension, etc. This stirring method consists of three parts: agitator, transmission device and stirring shaft system. Among them, the sealing structure of the stirring shaft can ensure that the stirred material will not escape during the operation of the mixer, thereby ensuring production efficiency and product quality. Magnetic liquid sealing devices have many advantages such as good sealing effect and easy maintenance, so they have been widely used.

[0003] A Chinese patent discloses a magnetic fluid sealing device using an axially magnetized permanent magnet ring with a pole tooth structure (Announcement No. CN113757385A). The patented technology solves the problems of the pole teeth in the classic structure of magnetic liquid sealing being damaged by the axial vibration of the main shaft, the poor sealing performance under large gaps, and the difficulty in installation and poor processing technology due to the small size of the pole tooth structure, so that the sealing technology is successfully applied to various occasions of magnetic liquid sealing. However, it cannot solve the disadvantage that the viscosity of the magnetic liquid decreases due to the high temperature and the sealing performance deteriorates in a high temperature environment. Utility Model Content

[0004] The utility model aims to provide a magnetic liquid sealing device for a vertical agitator to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A magnetic liquid sealing device for a vertical agitator comprises an outer shell, a permanent magnet is installed in the middle of the inner side wall of the outer shell, and pole shoes are installed on both sides of the inner side wall of the outer shell near the permanent magnet, a separation ring is installed on the inner side wall of the outer shell near the outer side of each pole shoe, and a bearing is installed on the inner side wall of the outer shell near the outer side of each separation ring, a rotating shaft is commonly penetrated through the inner side of the outer shell, the permanent magnet, the pole shoe and the bearing, a plurality of pole teeth are arranged on the outer side of the rotating shaft near the pole shoe, a plurality of magnetic fluid grooves are provided on the inner side of the pole shoe near the pole teeth, and magnetic liquid is filled between the pole teeth and the magnetic fluid grooves, a spiral water groove is provided on the inner side wall of the outer shell near the permanent magnet and the pole shoe, and a plurality of heat dissipation fins are arranged on the outer side of the side wall of the outer shell near the permanent magnet and the pole shoe.

[0007] As a further solution of the utility model: a first sealing ring is embedded and installed on the outer side of one end of the outer shell close to the rotating shaft, and a second sealing ring is installed between the outer shell and the side wall of each pole shoe.

[0008] As a further solution of the utility model: one end of the spiral water tank is fixedly connected with a water outlet, and the other end of the spiral water tank is fixedly connected with a water inlet.

[0009] As a further solution of the utility model: an oil inlet groove is formed at the junction of each partition ring and the outer shell, and an oil injection port communicated with the oil inlet groove is arranged on the outer side of the outer shell.

[0010] As a further solution of the utility model: an end cover is embedded and installed at one end of the outer shell, and the outer shell and the end cover are fixedly connected by screws.

[0011] As a further solution of the utility model: a flange is fixedly connected to one end of the outer shell far away from the end cover.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] Cooling liquid is injected into the spiral water tank through the water inlet of the utility model. The cooling liquid takes away the heat in the permanent magnet and the pole shoe and then discharges from the water outlet, thus effectively avoiding the overhigh temperature of the magnetic liquid. The heat of the permanent magnet and the pole shoe can be dissipated through the heat dissipation fins, avoiding the reduction of the viscosity of the magnetic liquid caused by temperature rise and the decline of the sealing performance. Brief Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of a magnetic liquid sealing device for a vertical stirrer;

[0015] Figure 2 It is a schematic cross-sectional view of a magnetic liquid sealing device for a vertical stirrer;

[0016] Figure 3 It is Figure 2 The enlarged structural schematic diagram of part A in

[0017] In the figure: 1. Outer shell; 2. First sealing ring; 3. Permanent magnet; 4. Pole shoe; 5. Heat dissipation fin; 6. Water outlet; 7. Spiral water tank; 8. Bearing; 9. End cover; 10. Rotating shaft; 11. Screw; 12. Partition ring; 13. Second sealing ring; 14. Water inlet; 15. Oil injection port; 16. Flange; 17. Oil inlet groove; 18. Pole teeth; 19. Magnetic fluid tank. Detailed Description of the Embodiment

[0018] Please refer to Figures 1 to 3, in the embodiment of the present utility model, a magnetic fluid sealing device for a vertical stirrer includes a housing 1. A permanent magnet 3 is installed in the middle of the inner side wall of the housing 1, and pole shoes 4 are installed on both sides of the inner side wall of the housing 1 close to the permanent magnet 3. A separating ring 12 is installed on the outer side of the inner side wall of the housing 1 close to each pole shoe 4, and a bearing 8 is installed on the outer side of the inner side wall of the housing 1 close to each separating ring 12. A rotating shaft 10 penetrates through the inside of the housing 1, the permanent magnet 3, the pole shoes 4, and the bearing 8. As Figure 3 shown, several pole teeth 18 are arranged at the position of the outer side of the rotating shaft 10 close to the pole shoes 4. Several magnetic fluid grooves 19 are formed on the inner side of the pole shoes 4 close to the pole teeth 18, and magnetic fluid is filled between the pole teeth 18 and the magnetic fluid grooves 19. The permanent magnet 3, the pole shoes 4, and the rotating shaft 10 form a magnetic circuit. Under the action of the magnetic field, the magnetic fluid between the pole teeth 18 and the magnetic fluid grooves 19 forms an "O"-shaped ring, thereby blocking the gap channel at the junction with the rotating shaft 10 to achieve the purpose of sealing. Therefore, when the rotating shaft 10 rotates in the bearing 8, air leakage does not occur at the junction of the rotating shaft 10 and the bearing 8; a spiral water groove 7 is formed inside the side wall of the housing 1 close to the permanent magnet 3 and the pole shoes 4, and several heat dissipation fins 5 are arranged outside the side wall of the housing 1 close to the permanent magnet 3 and the pole shoes 4. By introducing a coolant into the spiral water groove 7, the permanent magnet 3 and the pole shoes 4 can be cooled, and the heat of the permanent magnet 3 and the pole shoes 4 can be dissipated through the heat dissipation fins 5, avoiding the decrease in viscosity of the magnetic fluid caused by temperature rise and the decline of the sealing performance.

[0019] In Figure 2 , a first sealing ring 2 is embedded and installed at one end of the housing 1 close to the outer side of the rotating shaft 10. Through the first sealing ring 2, air leakage between the housing 1 and the vertical stirrer can be prevented; and a second sealing ring 13 is installed between the side walls of the housing 1 and each pole shoe 4. Through the second sealing ring 13, air leakage between the side walls of the housing 1 and the pole shoes 4 can be prevented.

[0020] In Figure 1 and Figure 2 , one end of the spiral water groove 7 is fixedly connected with a water outlet 6, and the other end of the spiral water groove 7 is fixedly connected with a water inlet 14. The coolant is injected into the spiral water groove 7 through the water inlet 14, and the coolant takes away the heat in the permanent magnet 3 and the pole shoes 4 and then discharges from the water outlet 6, thereby effectively avoiding the overhigh temperature of the magnetic fluid.

[0021] In Figure 1 and Figure 2In [the device], an oil inlet groove 17 is formed at the junction of each separating ring 12 and the outer housing 1, and an oil injection port 15 communicating with the oil inlet groove 17 is arranged on the outer side of the outer housing 1. Lubricating oil is injected into the oil inlet groove 17 through the oil injection port 15. The lubricating oil flows into the bearing 8 to lubricate the bearing 8.

[0022] In Figure 1 and Figure 2 [the device], an end cover 9 is embedded and installed at one end of the outer housing 1, and the outer housing 1 and the end cover 9 are fixedly connected by screws 11. Thus, after the end cover 9 is opened, the bearing 8, the separating ring 12, the pole shoe 4 and the permanent magnet 3 can be installed in the outer housing 1.

[0023] In Figure 1 and Figure 2 [the device], a flange 16 is fixedly connected to the outer side of the outer housing 1 at the end far from the end cover 9. The left end of the rotating shaft 10 is connected to the output end of the motor, and the right end of the rotating shaft 10 is fixedly connected to the stirring blade. Then, the magnetic liquid sealing device is installed on the vertical stirrer through the flange 16, and the inside of the vertical stirrer can be stirred, and the air leakage between the vertical stirrer and the magnetic liquid sealing device can be effectively prevented, achieving the purpose of sealing.

[0024] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A magnetic liquid sealing device for a vertical stirrer, comprising a housing (1), characterized in that, A permanent magnet (3) is installed in the middle of the inner side wall of the outer housing (1), and pole shoes (4) are installed on both sides of the inner side wall of the outer housing (1) close to the permanent magnet (3). A separating ring (12) is installed on the outer side of the inner side wall of the outer housing (1) close to each pole shoe (4), and a bearing (8) is installed on the outer side of the inner side wall of the outer housing (1) close to each separating ring (12). A rotating shaft (10) penetrates through the inside of the outer housing (1), the permanent magnet (3), the pole shoes (4), and the bearing (8) together. A number of pole teeth (18) are arranged on the outer side of the rotating shaft (10) close to the pole shoes (4). A number of magnetic fluid grooves (19) are formed on the inner side of the pole shoes (4) close to the pole teeth (18), and a magnetic liquid is filled between the pole teeth (18) and the magnetic fluid grooves (19). A spiral water groove (7) is formed inside the side wall of the outer housing (1) close to the permanent magnet (3) and the pole shoes (4), and a number of heat dissipation fins (5) are arranged on the outer side of the side wall of the outer housing (1) close to the permanent magnet (3) and the pole shoes (4).

2. The magnetic fluid sealing device for a vertical stirrer according to claim 1, characterized in that, A first sealing ring (2) is embedded and installed on the outer side of one end of the outer housing (1) close to the rotating shaft (10), and a second sealing ring (13) is installed between the side wall of the outer housing (1) and each pole shoe (4).

3. The magnetic fluid sealing device for a vertical stirrer according to claim 1, characterized in that, One end of the spiral water groove (7) is fixedly connected to a water outlet (6), and the other end of the spiral water groove (7) is fixedly connected to a water inlet (14).

4. The magnetic liquid sealing device for a vertical stirrer according to claim 1, characterized in that, An oil inlet groove (17) is formed at the junction of each separating ring (12) and the outer housing (1), and an oil injection port (15) communicated with the oil inlet groove (17) is arranged on the outer side of the outer housing (1).

5. A magnetic liquid sealing device for a vertical stirrer according to claim 1, characterized in that, An end cover (9) is embedded and installed at one end of the outer housing (1), and the outer housing (1) and the end cover (9) are fixedly connected by screws (11).

6. The magnetic fluid sealing device for a vertical stirrer according to claim 1, characterized in that, A flange plate (16) is fixedly connected to one end of the outer housing (1) far from the end cover (9).

Images