Magnetic liquid sealing device for pressure screw conveyer

Abstract

The utility model relates to the technical field of mechanical engineering sealing, and discloses a magnetic liquid sealing device for a pressure screw conveyor, which comprises a shell, a first bearing is arranged in the upper end of the shell, a second bearing is arranged in the lower end of the shell, a rotating shaft is arranged in the first bearing and the second bearing together, and the rotating shaft is arranged in the shell. A sealing mechanism is arranged between the shell and the rotating shaft, a plurality of cooling fins are installed on the outer surface of the shell from top to bottom, and a cleaning mechanism is arranged on the portion, located above the cooling fin on the uppermost side, of the outer surface of the shell. According to the magnetic liquid cleaning device, the heat dissipation fins are arranged, the contact area between the shell and external air is increased through the heat dissipation fins, heat generated by friction of the magnetic liquid is dissipated out, a motor in the cleaning mechanism drives a second gear to rotate, a supporting plate rotates around a supporting sleeve, and therefore a cleaning ring is driven to rotate to clean the heat dissipation fins; and dust accumulated on the surface is cleaned, so that the dust is prevented from forming a thermal resistance layer to influence heat dissipation.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical engineering seals, in particular to a magnetic liquid seal device for a pressure screw conveyor. Background Art

[0002] In order to ensure high sealing performance and avoid leakage of the medium in the pressure screw conveyor, a magnetic liquid sealing device needs to be installed between the driving mechanism and the screw rod in the pressure screw conveyor. The magnetic liquid seal is a new type of non-contact seal. It uses the characteristics of magnetic liquid with both fluidity and magnetic field responsiveness. By forming a magnetic field gradient in the sealing gap, the magnetic liquid forms a number of "O-type" liquid sealing rings in the sealing gap under the combined action of pressure and magnetic field force, thereby achieving a sealing pressure resistance effect.

[0003] Existing magnetic liquid seals are often cooled by circulating water. However, the circulating water cooling structure is complex and will greatly increase the axial length of the magnetic liquid seal device. In some occasions where the axial length is limited, it is difficult to implement a magnetic liquid seal plus a circulating water cooling system.

[0004] A Chinese patent discloses an air-cooled magnetic liquid sealing device (authorization announcement number CN203963026U). The patented technology only requires processing multiple annular grooves on the shell, and the contact area between the shell and the air is increased through the annular grooves. The structure is simple and the processing is convenient. It is particularly suitable for magnetic liquid sealing under high temperature conditions when the axial length of the magnetic liquid seal is limited.

[0005] However, it has certain disadvantages: during long-term use, dust will continue to accumulate in the annular groove, and when covered with dust, a thermal resistance layer will be formed, which will prevent heat from being transferred from the annular groove to the air. This will cause the heat dissipation efficiency to be significantly reduced, thereby affecting the heat dissipation performance of the entire device. Utility Model Content

[0006] The utility model aims to provide a magnetic liquid sealing device for a pressure screw conveyor to solve the problems raised in the above background technology.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A magnetic fluid sealing device for a pressure screw conveyor, comprising a housing. A first bearing is installed inside the upper end of the housing, and a second bearing is installed inside the lower end of the housing. A rotating shaft is jointly installed inside the first bearing and the second bearing. A sealing mechanism is arranged between the housing and the rotating shaft, and a plurality of heat dissipation fins are installed on the outer surface of the housing from top to bottom. A cleaning mechanism is arranged above the uppermost heat dissipation fin on the outer surface of the housing. The cleaning mechanism includes a support sleeve and a first gear located below the support sleeve. A chute is opened on the outer surface of the support sleeve, and a cleaning part is slidably connected inside the chute.

[0009] As a further scheme of the present utility model: The sealing mechanism includes a permanent magnet and pole shoes located on the upper and lower sides of the permanent magnet. A plurality of pole teeth are installed on the inner surface of the pole shoes, and magnetic fluid is filled on the inner surface of the pole teeth.

[0010] As a further scheme of the present utility model: The cleaning part includes a support plate. A motor is installed on the upper surface of the support plate, a second gear is installed at the output end of the motor, an L-shaped rod is installed at the front end of the lower surface of the support plate, and a cleaning ring is installed at the lower end of the L-shaped rod.

[0011] As a further scheme of the present utility model: Both the support sleeve and the first gear are installed outside the housing.

[0012] As a further scheme of the present utility model: Both the permanent magnet and the pole shoes are installed inside the housing, and both the permanent magnet and the pole shoes are located outside the rotating shaft. The magnetic fluid adheres to the outer surface of the rotating shaft.

[0013] As a further scheme of the present utility model: The rear end of the support plate is slidably connected inside the chute. The first gear is meshed with the second gear, and the cleaning ring is movably sleeved outside a plurality of heat dissipation fins.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] 1. By setting heat dissipation fins, the heat dissipation fins increase the contact area between the housing and the external air, and dissipate the heat generated by the friction of the magnetic fluid, thereby improving the heat dissipation efficiency of the entire device.

[0016] 2. By setting a cleaning mechanism, the motor in the cleaning mechanism drives the second gear to rotate, so that the support plate rotates around the support sleeve, thereby driving the cleaning ring to rotate to clean the heat dissipation fins, and cleaning the dust accumulated on its surface, avoiding the formation of a thermal resistance layer by the dust and affecting the heat dissipation. Description of the Drawings

[0017] Figure 1Schematic structural diagram of a magnetic liquid sealing device for a pressure screw conveyor;

[0018] Figure 2 Partial cross-sectional view of a magnetic liquid sealing device for a pressure screw conveyor;

[0019] Figure 3 Schematic structural diagram of a cleaning mechanism in a magnetic liquid sealing device for a pressure screw conveyor;

[0020] Figure 4 Schematic diagram of the actual installation and use of a magnetic liquid sealing device for a pressure screw conveyor;

[0021] Figure 5 It is Figure 4 Enlarged view of A in

[0022] In the figure: 1. Housing; 2. First bearing; 3. Second bearing; 4. Rotating shaft; 5. Sealing mechanism; 6. Permanent magnet; 7. Pole shoe; 8. Pole teeth; 9. Magnetic liquid; 10. Heat dissipation fins; 11. Cleaning mechanism; 12. Support sleeve; 13. First gear; 14. Chute; 15. Cleaning part; 16. Support plate; 17. Motor; 18. Second gear; 19. L-shaped rod; 20. Cleaning ring; 21. Pressure screw conveyor. Detailed implementation mode

[0023] Please refer to Figure 1 , Figure 2 , Figure 4 and Figure 5 , in the embodiment of the present invention, a magnetic liquid sealing device for a pressure screw conveyor includes a housing 1. A first bearing 2 is installed inside the upper end of the housing 1, and a second bearing 3 is installed inside the lower end of the housing 1. The first bearing 2 and the second bearing 3 jointly install a rotating shaft 4 inside. A sealing mechanism 5 is arranged between the housing 1 and the rotating shaft 4. The sealing mechanism 5 includes a permanent magnet 6 and pole shoes 7 located on the upper and lower sides of the permanent magnet 6. The permanent magnet 6 and the pole shoes 7 are both installed inside the housing 1, and both the permanent magnet 6 and the pole shoes 7 are located outside the rotating shaft 4. A plurality of pole teeth 8 are installed on the inner surface of the pole shoe 7, and a magnetic liquid 9 is filled on the inner surface of the pole teeth 8. The magnetic liquid 9 adheres to the outer surface of the rotating shaft 4;

[0024] The housing 1 serves as the outer shell of the entire sealing device, providing protection and support functions, and it is made of non-magnetic conductive material;

[0025] The first bearing 2 and the second bearing 3 jointly support and allow the rotating shaft 4 to rotate;

[0026] The rotating shaft 4 is a key component of the pressure screw conveyor. One end of it is connected to a driving device, such as a motor, and the other end is connected to a screw conveyor rod for transporting materials. It is made of magnetic conductive material;

[0027] The permanent magnet 6 provides a stable magnetic field source to generate a magnetic field; the pole shoe 7 is used for concentrating the magnetic field and forming a magnetic field gradient in the sealed gap, and it is made of a magnetic conductive material; the pole teeth 8 are used for further concentrating the magnetic field to form a non-uniform magnetic field in the sealed gap; the magnetic fluid 9 is filled between the inner surface of the pole teeth 8 and the rotating shaft 4, and is attracted by the magnetic field to form a sealing layer, playing a sealing role.

[0028] In Figure 1 and Figure 2 : A plurality of heat dissipation fins 10 are installed on the outer surface of the housing 1 from top to bottom;

[0029] When the rotating shaft 4 rotates, the magnetic fluid 9 will generate heat due to friction; the heat dissipation fins 10 increase the contact area between the housing 1 and the air, thereby improving the heat dissipation efficiency of the device.

[0030] In Figures 1 to 3 : A cleaning mechanism 11 is arranged above the uppermost heat dissipation fin 10 on the outer surface of the housing 1. The cleaning mechanism 11 includes a support sleeve 12 and a first gear 13 located below the support sleeve 12. Both the support sleeve 12 and the first gear 13 are installed outside the housing 1. A chute 14 is formed on the outer surface of the support sleeve 12, and a cleaning member 15 is slidably connected inside the chute 14. The cleaning member 15 includes a support plate 16. The rear end of the support plate 16 is slidably connected inside the chute 14. A motor 17 is installed on the upper surface of the support plate 16. The output end of the motor 17 is installed with a second gear 18. The first gear 13 is meshed with the second gear 18. The front end of the lower surface of the support plate 16 is installed with an L-shaped rod 19, and the lower end of the L-shaped rod 19 is installed with a cleaning ring 20. The cleaning ring 20 is movably sleeved outside a plurality of heat dissipation fins 10;

[0031] When the second gear 18 rotates, it will drive the support plate 16 to rotate around the support sleeve 12, thereby driving the cleaning ring 20 to rotate around the heat dissipation fins 10. The dust and impurities accumulated on the surface of the heat dissipation fins 10 can be cleaned by the cleaning ring 20, avoiding the influence of dust on the heat dissipation efficiency;

[0032] The motor 17 has self-locking, that is, after power-off, its motor shaft cannot rotate;

[0033] A cleaning pad is installed on the contact surface between the cleaning ring 20 and the heat dissipation fins 10. The cleaning pad is preferably made of sponge or rubber material, and it fits the heat dissipation fins 10 for cleaning;

[0034] The second gear 18 does not contact the L-shaped rod 19 and will not cause movement interference.

[0035] The working principle of the present utility model is as follows: During use, the user installs the device on the pressure screw conveyor 21, connects one end of it to the conveying rod, and docks the other end to the driving device; The magnetic fluid 9 has magnetism and fluidity. When it is introduced into the sealing gap and exposed to a magnetic field, it will be strongly attracted by the magnetic field; Under the action of the magnetic field, the magnetic fluid 9 will be distributed along the magnetic force lines and form a dense magnetic fluid "O"-shaped sealing ring between the pole teeth 8 and the rotating shaft 4. This sealing ring can effectively isolate the media on both sides of the sealing gap and achieve the sealing function; The heat dissipation fins 10 are used to dissipate heat from the entire sealing device; At regular intervals, the motor 17 drives the second gear 18 to rotate. While the second gear 18 rotates, it rotates around the support sleeve 12, thereby driving the support plate 16 to rotate, and further driving the cleaning ring 20 to rotate. The cleaning ring 20 is used to clean the heat dissipation fins 10 to prevent a large amount of dust from accumulating on their surfaces.

[0036] The above is only the preferred specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, makes equivalent replacements or changes, and all should be covered within the protection scope of the present utility model.

[0037] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

Claims

1. A magnetic fluid sealing device for a pressure screw conveyor, comprising a housing (1). A first bearing (2) is installed inside the upper end of the housing (1), and a second bearing (3) is installed inside the lower end of the housing (1). A rotating shaft (4) is jointly installed inside the first bearing (2) and the second bearing (3). A sealing mechanism (5) is arranged between the housing (1) and the rotating shaft (4). A plurality of heat dissipation fins (10) are installed on the outer surface of the housing (1) from top to bottom. It is characterized in that, Above the outermost upper heat dissipation fins (10) on the outer surface of the housing (1), a cleaning mechanism (11) is provided. The cleaning mechanism (11) includes a support sleeve (12) and a first gear (13) located below the support sleeve (12). A chute (14) is formed on the outer surface of the support sleeve (12), and a cleaning member (15) is slidably connected inside the chute (14).

2. The magnetic liquid sealing device for a pressure screw conveyor according to claim 1, characterized in that, The sealing mechanism (5) includes a permanent magnet (6) and pole shoes (7) located on the upper and lower sides of the permanent magnet (6). A plurality of pole teeth (8) are installed on the inner surface of the pole shoes (7), and a magnetic fluid (9) is filled on the inner surface of the pole teeth (8).

3. A magnetic fluid sealing device for a pressure screw conveyor according to claim 1, characterized in that, The cleaning member (15) includes a support plate (16). A motor (17) is installed on the upper surface of the support plate (16). The output end of the motor (17) is installed with a second gear (18). An L-shaped rod (19) is installed at the front end of the lower surface of the support plate (16), and a cleaning ring (20) is installed at the lower end of the L-shaped rod (19).

4. A magnetic fluid sealing device for a pressure screw conveyor according to claim 1, characterized in that, Both the support sleeve (12) and the first gear (13) are installed outside the housing (1).

5. The magnetic fluid sealing device for a pressure screw conveyor according to claim 2, wherein Both the permanent magnet (6) and the pole shoes (7) are installed inside the housing (1), and both the permanent magnet (6) and the pole shoes (7) are located outside the rotating shaft (4). The magnetic fluid (9) adheres to the outer surface of the rotating shaft (4).

6. The magnetic fluid sealing device for a pressure screw conveyor according to claim 3, characterized in that, The rear end of the support plate (16) is slidably connected inside the chute (14). The first gear (13) is meshed with the second gear (18), and the cleaning ring (20) is movably sleeved outside a plurality of heat dissipation fins (10).

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