Long life dust and nuclear radiation proof magnetic liquid seal

Abstract

The application relates to a long-service-life anti-nuclear-radiation dustproof magnetic liquid sealing device, and belongs to the technical field of mechanical engineering sealing. The device comprises a shell assembly, a threaded end cover, a clamping hoop assembly, a magnetic guide sleeve assembly, magnetic liquid, four permanent magnets, four magnetic shielding rings, a right bearing, a right pole shoe assembly, a middle pole shoe assembly, a left pole shoe assembly, a left bearing and a syringe. The magnetic liquid is injected between the permanent magnet I, the permanent magnet IV and the shell to form a magnetic liquid static seal, and the magnetic liquid is injected between the permanent magnet I and the permanent magnet IV and the magnetic guide sleeve to form a magnetic liquid dynamic seal, so that the right bearing and the left bearing are prevented from being blocked due to the entry of radioactive powder, and the stable operation of the device is ensured; when the original magnetic liquid is consumed, the locking screw on the shell is taken out, the magnetic liquid is injected into the opened magnetic liquid supplement injection channel through the syringe, under the action of the magnetic field, the injected magnetic liquid re-forms the magnetic liquid seal, the complexity of the maintenance operation is reduced, and the pressure resistance of the device is ensured.

Description

Technical Field

[0001] This invention belongs to the field of nuclear energy technology, specifically relating to a long-life magnetic liquid sealing device that is protected against nuclear radiation and dust. Background Technology

[0002] In the nuclear energy field, many nuclear power equipment components in nuclear reactors are exposed to various high-energy radiation environments during operation, and are also subject to various radioactive powder materials in different working media. All of these factors significantly impact the components of the nuclear power equipment. For example, nuclear radiation can damage traditionally sealed components, affecting the pressure resistance and service life of the seals; radioactive dust entering bearings increases operating torque, and in severe cases, can cause equipment jamming. Simultaneously, due to the unique radiation environment in which nuclear power equipment operates, it is essential to ensure stable operation over extended periods, minimizing the frequency, steps, and duration of maintenance and repairs. Under these special conditions, a magnetic liquid sealing device that can operate for a long lifespan and is protected against nuclear radiation and dust is required. Summary of the Invention

[0003] This invention proposes a magnetic liquid sealing device that is installed on the rotating shaft of nuclear energy equipment, possesses good radiation protection performance, strong pressure resistance, and can operate for a long time in radioactive powder environments. The purpose is to prevent nuclear radiation from damaging the components of the magnetic liquid sealing device, prevent radioactive powder from entering the magnetic liquid seal and causing equipment jamming, improve the pressure resistance of the sealing device, and reduce operational complexity by designing a magnetic liquid replenishment and injection channel. This allows for rapid replacement of the magnetic liquid inside the magnetic liquid seal without disassembling its internal structure, ensuring the long-term operational reliability of the sealing device.

[0004] The technical solution adopted in this invention is: a long-life magnetic liquid sealing device for preventing nuclear radiation and dust, comprising: a shell (1), an outer rubber ring I (101), a set screw I (102), an outer rubber ring II (103), a set screw II (104), an outer rubber ring III (105), a set screw III (106), an outer rubber ring IV (107), a set screw IV (108), an outer rubber ring V (109), a set screw V (110), an outer rubber ring VI (111), a threaded end cap (2), a clamping clamp (3), a set screw VI (301), a magnetic bushing (4), an inner rubber ring I (401), a retaining ring I (402), and a retaining ring II (403). 03), Snap ring III (404), Inner rubber ring II (405), Magnetic fluid (5), Permanent magnet I (6), Magnetic isolation ring I (7), Right bearing (8), Magnetic isolation ring II (9), Right pole shoe (10), Pole shoe rubber ring I (1001), Pole shoe rubber ring II (1002), Permanent magnet II (11), Intermediate pole shoe (12), Pole shoe rubber ring III (1201), Pole shoe rubber ring IV (1202), Permanent magnet III (13), Left pole shoe (14), Pole shoe rubber ring V (1401), Pole shoe rubber ring VI (1402), Magnetic isolation ring III (15), Left bearing (16), Magnetic isolation ring IV (17), Permanent magnet IV (18), Syringe (19).

[0005] The connections between the various parts of the device are as follows: the outer shell (1), outer rubber ring I (101), set screw I (102), outer rubber ring II (103), set screw II (104), outer rubber ring III (105), set screw III (106), outer rubber ring IV (107), set screw IV (108), outer rubber ring V (109), set screw V (110), and outer rubber ring VI (111) constitute the outer shell (1) assembly. The clamping band (3) and the set screw VI (301) constitute the clamping band (3) assembly. The magnetic bushing (4), the inner rubber ring I (401), the retaining ring I (402), the retaining ring II (403), the retaining ring III (404), and the inner rubber ring II (405) constitute the magnetic bushing (4) assembly. The right pole shoe (10), the pole shoe rubber ring I (1001), and the pole shoe rubber ring II (1002) constitute the right pole shoe (10) assembly. The intermediate pole shoe (12) The pole shoe rubber rings III (1201) and IV (1202) constitute the intermediate pole shoe (12) assembly, and the left pole shoe (14), V (1401), and VI (1402) constitute the left pole shoe (14) assembly; the permanent magnet IV (18), the magnetic isolation ring IV (17), the left bearing (16), the magnetic isolation ring III (15), the left pole shoe (14) assembly, the permanent magnet III (13), the intermediate pole shoe (12) assembly, and the permanent magnet II (11), right pole shoe (10) assembly, magnetic shielding ring II (9), right bearing (8), magnetic shielding ring I (7), permanent magnet I (6) are installed on the magnetic guide sleeve (4) assembly from left to right, and then installed into the outer shell (1) assembly; the outer shell (1) assembly and the threaded end cap (2) are connected by threads; the clamping clamp (3) is connected to the magnetic guide sleeve (4) assembly by the set screw VI (301) to fix the entire sealing device on the rotating shaft of the nuclear energy equipment.

[0006] The magnetic shielding ring IV (17) has a radial through hole, and the outer shell (1) has a radial threaded hole at the corresponding position of the through hole of the magnetic shielding ring IV (17). The threaded hole and the through hole are concentric. The set screw I (102) is installed in the threaded hole, forming a closed magnetic liquid (5) replenishment injection channel I; the left pole shoe (14) has a radial through hole, and the outer shell (1) has a radial threaded hole at the corresponding position of the through hole of the left pole shoe (14). The threaded hole and the through hole are concentric. The set screw II (104) is installed in the threaded hole, forming a closed magnetic liquid (5) replenishment injection channel I; 5) Supplemental injection channel II; The intermediate pole shoe (12) is provided with a radial through hole, and the outer shell (1) is provided with a radial threaded hole at the corresponding position of the through hole of the intermediate pole shoe (12). The threaded hole and the through hole are concentric. The set screw III (106) is installed in the threaded hole, forming a closed magnetic liquid (5) supplemental injection channel III; The right pole shoe (10) is provided with a radial through hole, and the outer shell (1) is provided with a radial threaded hole at the corresponding position of the through hole of the right pole shoe (10). The threaded hole and the through hole are concentric. The set screw IV (108 ... A closed magnetic liquid (5) replenishment injection channel IV is formed; a radial through hole is provided on the magnetic shielding ring I (7), and a radial threaded hole is provided on the outer shell (1) at the corresponding position of the through hole of the magnetic shielding ring I (7). The threaded hole and the through hole are concentric. The set screw V (110) is installed in the threaded hole to form a closed magnetic liquid (5) replenishment injection channel V; on the outer shell (1), the left side of set screw I (102), between set screw I (102) and set screw II (104), between set screw II (104) and set screw III (106), and set screw III (106) is provided with an annular groove between the set screw IV (108), between the set screw IV (108) and the set screw V (110), and on the right side of the set screw V (110). The outer rubber ring I (101), outer rubber ring II (103), outer rubber ring III (105), outer rubber ring IV (107), outer rubber ring V (109), and outer rubber ring VI (111) are installed in the corresponding grooves. The outer side of the left end face of the outer shell (1) is provided with an annular boss for positioning and connecting the long-life nuclear radiation protection and dust protection magnetic liquid sealing device with nuclear energy equipment.

[0007] The permanent magnets I (6) and IV (18) are axially magnetized annular permanent magnets. The permanent magnet I (6) is located between the threaded end cap (2) and the magnetic isolation ring I (7). The threaded end cap (2) has an annular boss on its left end face to provide axial positioning for the permanent magnet I (6). The magnetic isolation ring I (7) has an annular boss on its right end face with an inner diameter equal to the outer diameter of the permanent magnet I (6) to provide radial positioning for the permanent magnet I (6). The permanent magnet IV (18) is located between the left end face of the outer shell (1) and the magnetic isolation ring IV (17). The outer shell (1) has an annular boss on its inner side on its left end face to provide axial positioning for the permanent magnet IV (18). A ring boss with the same inner diameter as the outer diameter of permanent magnet IV (18) is provided on the left end face of ring IV (17) to provide radial positioning for permanent magnet IV (18); there is a gap between the outer circular surface of permanent magnet I (6) and permanent magnet IV (18) and the corresponding position of the inner circular surface of the outer shell (1), and there is a gap between the inner circular surface of permanent magnet I (6) and permanent magnet IV (18) and the corresponding position of the outer circular surface of magnetic bushing (4). Magnetic liquid (5) is injected into the gap, and the magnetic liquid (5) gathers at the left and right tip rings of the outer circular surface and the left and right tip rings of the inner circular surface of permanent magnet I (6) and permanent magnet IV (18) under the action of magnetic field, forming a magnetic liquid static and dynamic seal;

[0008] The permanent magnets II (11) and III (13) are axially magnetized annular permanent magnets with opposite magnetization directions. The permanent magnet II (11) is located between the right pole shoe (10) and the intermediate pole shoe (12). The left side of the right pole shoe (10) has an annular boss with an outer diameter equal to the inner diameter of the permanent magnet II (11). The right side of the intermediate pole shoe (12) has an annular boss with an outer diameter equal to the inner diameter of the permanent magnet II (11). The permanent magnet II (11) provides radial and axial positioning; the permanent magnet III (13) is located between the intermediate pole shoe (12) and the left pole shoe (14). The left side of the intermediate pole shoe (12) is provided with an annular boss whose outer diameter is the same as the inner diameter of the permanent magnet III (13), and the right side of the left pole shoe (14) is provided with an annular boss whose outer diameter is the same as the inner diameter of the permanent magnet III (13), providing radial and axial positioning for the permanent magnet III (13);

[0009] The right pole shoe (10) has an annular groove on each side of its radial through hole, and the pole shoe rubber ring I (1001) and pole shoe rubber ring II (1002) are installed in the corresponding grooves; the middle pole shoe (12) has an annular groove on each side of its radial through hole, and the pole shoe rubber ring III (1201) and pole shoe rubber ring IV (1202) are installed in the corresponding grooves; the left pole shoe (14) has an annular groove on each side of its radial through hole, and the pole shoe rubber ring V (1401) and pole shoe rubber ring VI (1402) are installed in the corresponding grooves; the inner surfaces of the right pole shoe (10), the middle pole shoe (12), and the left pole shoe (14) are provided with several pole teeth, and there is a gap between the inner surface of the magnetic bushing (4) and the corresponding position. Magnetic liquid (5) is injected into the gap, and the magnetic liquid (5) gathers at several pole teeth on the inner surfaces of the right pole shoe (10), the middle pole shoe (12), and the left pole shoe (14) under the action of a magnetic field, forming a magnetic liquid dynamic seal;

[0010] The outer surface of the magnetic bushing (4) is provided with three annular grooves, into which snap rings I (402), II (403) and III (404) are respectively placed; snap ring I (402) provides axial positioning for the inner ring of the right bearing (8), and snap rings II (403) and III (404) provide axial positioning for the inner ring of the left bearing (16), ensuring that the right bearing (8) is a floating end and the left bearing (16) is a fixed end; the magnetic isolation ring I (7) is located between the right bearing (8) and the right pole shoe (10), and together with the magnetic isolation ring II (9), provides axial positioning for the outer ring of the right bearing (8); the magnetic isolation ring III (15) is located between the left pole shoe (14) and the left bearing (16), and together with the magnetic isolation ring IV (17), provides axial positioning for the outer ring of the left bearing (16); the inner surface of the magnetic bushing (4) is provided with two annular grooves, into which inner rubber rings I (401) and II (405) are respectively placed;

[0011] The magnetic bushing (4) has a shoulder on the right side at the position of the clamping clamp (3) assembly, which provides axial positioning for the clamping clamp (3) assembly; the right end face of the magnetic bushing (4) has several grooves along the circumferential direction, the groove depth is greater than the thickness of the clamping clamp (3) and less than the distance between the inner rubber ring I (401) and the right end face of the magnetic bushing (4); the clamping clamp (3) has several radial threaded holes along the circumferential direction, the threaded holes are offset from several grooves on the right end of the magnetic bushing (4), the set screw VI (301) is installed in the threaded hole, pressing the magnetic bushing (4) assembly, and fixing the long-life nuclear radiation protection and dust protection magnetic liquid sealing device on the rotating shaft of the nuclear energy equipment.

[0012] Compared with traditional magnetic liquid sealing devices, the present invention has the following advantages: Magnetic liquid (5) is injected between the outer surfaces of permanent magnet I (6) and permanent magnet IV (18) and the corresponding positions of the inner surfaces of the outer shell (1) to form a static magnetic liquid seal; magnetic liquid (5) is injected between the inner surfaces of permanent magnet I (6) and permanent magnet IV (18) and the corresponding positions of the outer surfaces of the magnetic bushing (4) to form a dynamic magnetic liquid seal. This prevents radioactive powder from entering the long-life anti-nuclear radiation and dustproof magnetic liquid sealing device through the gaps between the outer shell (1) and the magnetic bushing (4), the gaps between the outer shell (1) and the threaded end cap (2), and the gaps between the threaded end cap (2) and the magnetic bushing (4), thus preventing... The right bearing (8) and left bearing (16) are jammed due to the entry of radioactive powder, ensuring the stable and reliable operation of the sealing device. When the equipment is running in a nuclear radiation environment for a long time, due to the effects of nuclear radiation and high temperature, the original magnetic liquid (5) may be lost to some extent. The magnetic liquid (5) can be injected from the magnetic liquid (5) replenishment channel through the syringe (19), so as to quickly replenish the magnetic liquid (5) inside without disassembling the internal structure of the long-life nuclear radiation protection and dustproof magnetic liquid sealing device, reduce the complexity of operation, improve the overall sealing effect, and ensure the pressure resistance and reliability of the long-life nuclear radiation protection and dustproof magnetic liquid sealing device.

[0013] The method of replenishing magnetic liquid (5) in this invention is as follows: Set screw I (102) and set screw V (110) are removed, and magnetic liquid (5) is injected through the open magnetic liquid (5) replenishment channels I and V using a syringe (19). Under the action of a magnetic field, the replenished magnetic liquid (5) gathers at the left and right tip rings on the outer and inner circular surfaces of permanent magnets I (6) and IV (18), thus reconstructing the static and dynamic density of the magnetic liquid. Seal; remove set screws II (104), III (106), and IV (108), and inject magnetic liquid (5) into the opened magnetic liquid (5) replenishment channel II, magnetic liquid (5) replenishment channel III, and magnetic liquid (5) replenishment channel IV through syringe (19). Under the action of the magnetic field, the replenished magnetic liquid (5) gathers at several pole teeth on the inner side of the right pole shoe (10), the middle pole shoe (12), and the left pole shoe (14), and re-forms a magnetic liquid dynamic seal. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a long-life, radiation-proof, dust-proof magnetic liquid sealing device according to an embodiment of the present invention.

[0015] Figure 1Middle: Outer shell (1), outer rubber ring I (101), set screw I (102), outer rubber ring II (103), set screw II (104), outer rubber ring III (105), set screw III (106), outer rubber ring IV (107), set screw IV (108), outer rubber ring V (109), set screw V (110), outer rubber ring VI (111), threaded end cap (2), clamping clamp (3), set screw VI (301), magnetic bushing (4), inner rubber ring I (401), snap ring I (402), snap ring II (403), snap ring III (404), inner rubber ring Rubber ring II (405), magnetic fluid (5), permanent magnet I (6), magnetic isolation ring I (7), right bearing (8), magnetic isolation ring II (9), right pole shoe (10), pole shoe rubber ring I (1001), pole shoe rubber ring II (1002), permanent magnet II (11), intermediate pole shoe (12), pole shoe rubber ring III (1201), pole shoe rubber ring IV (1202), permanent magnet III (13), left pole shoe (14), pole shoe rubber ring V (1401), pole shoe rubber ring VI (1402), magnetic isolation ring III (15), left bearing (16), magnetic isolation ring IV (17), permanent magnet IV (18).

[0016] Figure 2 This is a magnified view of part A in an embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of the supplementary injection of magnetic fluid in an embodiment of the present invention.

[0018] Figure 4 This is a magnified view of part B in an embodiment of the present invention.

[0019] Figure 4 In the middle: Syringe (19).

[0020] Figure 5 This is a CC cross-sectional view of an embodiment of the present invention. Detailed Implementation

[0021] The following detailed description of one embodiment of the present invention is for illustrative purposes only and should not be construed as limiting the invention in any way. The invention will be further described with reference to the accompanying drawings:

[0022] A long-life magnetic liquid sealing device for preventing nuclear radiation and dust, comprising the following components: outer shell (1), outer rubber ring I (101), set screw I (102), outer rubber ring II (103), set screw II (104), outer rubber ring III (105), set screw III (106), outer rubber ring IV (107), set screw IV (108), outer rubber ring V (109), set screw V (110), outer rubber ring VI (111), threaded end cap (2), clamping clamp (3), set screw VI (301), magnetic bushing (4), inner rubber ring I (401), retaining ring I (402), retaining ring II (403), retaining ring III (404), Inner Rubber Ring II (405), Magnetic Fluid (5), Permanent Magnet I (6), Magnetic Isolation Ring I (7), Right Bearing (8), Magnetic Isolation Ring II (9), Right Pole Shoe (10), Pole Shoe Rubber Ring I (1001), Pole Shoe Rubber Ring II (1002), Permanent Magnet II (11), Intermediate Pole Shoe (12), Pole Shoe Rubber Ring III (1201), Pole Shoe Rubber Ring IV (1202), Permanent Magnet III (13), Left Pole Shoe (14), Pole Shoe Rubber Ring V (1401), Pole Shoe Rubber Ring VI (1402), Magnetic Isolation Ring III (15), Left Bearing (16), Magnetic Isolation Ring IV (17), Permanent Magnet IV (18), Syringe (19).

[0023] The connections between the various parts of the device are as follows: the outer shell (1), outer rubber ring I (101), set screw I (102), outer rubber ring II (103), set screw II (104), outer rubber ring III (105), set screw III (106), outer rubber ring IV (107), set screw IV (108), outer rubber ring V (109), set screw V (110), and outer rubber ring VI (111) constitute the outer shell (1) assembly. The clamping band (3) and the set screw VI (301) constitute the clamping band (3) assembly. The magnetic bushing (4), the inner rubber ring I (401), the retaining ring I (402), the retaining ring II (403), the retaining ring III (404), and the inner rubber ring II (405) constitute the magnetic bushing (4) assembly. The right pole shoe (10), the pole shoe rubber ring I (1001), and the pole shoe rubber ring II (1002) constitute the right pole shoe (10) assembly. The intermediate pole shoe (12) The pole shoe rubber rings III (1201) and IV (1202) constitute the intermediate pole shoe (12) assembly, and the left pole shoe (14), V (1401), and VI (1402) constitute the left pole shoe (14) assembly; the permanent magnet IV (18), the magnetic isolation ring IV (17), the left bearing (16), the magnetic isolation ring III (15), the left pole shoe (14) assembly, the permanent magnet III (13), the intermediate pole shoe (12) assembly, and the permanent magnet II (11), right pole shoe (10) assembly, magnetic shielding ring II (9), right bearing (8), magnetic shielding ring I (7), permanent magnet I (6) are installed on the magnetic guide sleeve (4) assembly from left to right, and then installed into the outer shell (1) assembly; the outer shell (1) assembly and the threaded end cap (2) are connected by threads; the clamping clamp (3) is connected to the magnetic guide sleeve (4) assembly by the set screw VI (301) to fix the entire sealing device on the rotating shaft of the nuclear energy equipment.

[0024] The magnetic shielding ring IV (17) has a radial through hole, and the outer shell (1) has a radial threaded hole at the corresponding position of the through hole of the magnetic shielding ring IV (17). The threaded hole and the through hole are concentric. The set screw I (102) is installed in the threaded hole, forming a closed magnetic liquid (5) replenishment injection channel I; the left pole shoe (14) has a radial through hole, and the outer shell (1) has a radial threaded hole at the corresponding position of the through hole of the left pole shoe (14). The threaded hole and the through hole are concentric. The set screw II (104) is installed in the threaded hole, forming a closed magnetic liquid (5) replenishment injection channel I; 5) Supplemental injection channel II; The intermediate pole shoe (12) is provided with a radial through hole, and the outer shell (1) is provided with a radial threaded hole at the corresponding position of the through hole of the intermediate pole shoe (12). The threaded hole and the through hole are concentric. The set screw III (106) is installed in the threaded hole, forming a closed magnetic liquid (5) supplemental injection channel III; The right pole shoe (10) is provided with a radial through hole, and the outer shell (1) is provided with a radial threaded hole at the corresponding position of the through hole of the right pole shoe (10). The threaded hole and the through hole are concentric. The set screw IV (108 ... A closed magnetic liquid (5) replenishment injection channel IV is formed; a radial through hole is provided on the magnetic shielding ring I (7), and a radial threaded hole is provided on the outer shell (1) at the corresponding position of the through hole of the magnetic shielding ring I (7). The threaded hole and the through hole are concentric. The set screw V (110) is installed in the threaded hole to form a closed magnetic liquid (5) replenishment injection channel V; on the outer shell (1), the left side of set screw I (102), between set screw I (102) and set screw II (104), between set screw II (104) and set screw III (106), and set screw III (106) is provided with an annular groove between the set screw IV (108), between the set screw IV (108) and the set screw V (110), and on the right side of the set screw V (110). The outer rubber ring I (101), outer rubber ring II (103), outer rubber ring III (105), outer rubber ring IV (107), outer rubber ring V (109), and outer rubber ring VI (111) are installed in the corresponding grooves. The outer side of the left end face of the outer shell (1) is provided with an annular boss for positioning and connecting the long-life nuclear radiation protection and dust protection magnetic liquid sealing device with nuclear energy equipment.

[0025] The permanent magnet I (6) and permanent magnet IV (18) are axially magnetized annular permanent magnets. The permanent magnet I (6) is located between the threaded end cap (2) and the magnetic isolation ring I (7). The left end face of the threaded end cap (2) is provided with an annular boss to provide axial positioning for the permanent magnet I (6). The right end face of the magnetic isolation ring I (7) is provided with an annular boss whose inner diameter is the same as the outer diameter of the permanent magnet I (6) to provide radial positioning for the permanent magnet I (6). The permanent magnet IV (18) is located between the left end face of the outer shell (1) and the magnetic isolation ring IV (17). The inner side of the left end face of the outer shell (1) is provided with an annular boss to provide axial positioning for the permanent magnet IV (18). The left end face of the magnetic isolation ring IV (17) is provided with an annular boss whose inner diameter is the same as the outer diameter of the permanent magnet IV (18) to provide radial positioning for the permanent magnet IV (18).

[0026] There is a gap between the outer circular surfaces of permanent magnet I (6) and permanent magnet IV (18) and the corresponding positions of the inner circular surfaces of the outer shell (1), and there is a gap between the inner circular surfaces of permanent magnet I (6) and permanent magnet IV (18) and the corresponding positions of the outer circular surfaces of the magnetic bushing (4). The gap ranges from 0.05 to 0.3 mm. Magnetic liquid (5) is injected into the gap. Due to the tip effect, the magnetic liquid (5) accumulates on the outer surface of permanent magnet I (6) and permanent magnet IV (18) under the action of the magnetic field. The left and right tip rings of the circular surface and the left and right tip rings of the inner circular surface form a magnetic liquid static and dynamic seal to prevent radioactive powder from entering the long-life anti-nuclear radiation and dustproof magnetic liquid sealing device from the gap between the outer shell (1) and the magnetic bushing (4), the gap between the outer shell (1) and the threaded end cap (2), and the gap between the threaded end cap (2) and the magnetic bushing (4). This also prevents the right bearing (8) and the left bearing (16) from jamming due to the entry of radioactive powder, ensuring the stable and reliable operation of the sealing device.

[0027] When the equipment operates in a nuclear radiation environment for a long time, due to the effects of nuclear radiation and high temperature, the original magnetic liquid (5) will be lost to a certain extent. Take out the set screw I (102) and set screw V (110), and inject the magnetic liquid (5) into the open magnetic liquid (5) replenishment channel I and magnetic liquid (5) replenishment channel V through the syringe (19). Under the action of the magnetic field, the replenished magnetic liquid (5) gathers at the left and right tip rings on the outer circular surface and the left and right tip rings on the inner circular surface of the permanent magnet I (6) and permanent magnet IV (18), and reconstructs the static and dynamic seal of the magnetic liquid. This allows for the rapid replenishment of the magnetic liquid (5) inside without disassembling the internal structure of the long-life nuclear radiation and dustproof magnetic liquid sealing device, reducing the complexity of operation, improving the overall sealing effect, and ensuring the pressure resistance and reliability of the long-life nuclear radiation and dustproof magnetic liquid sealing device.

[0028] The permanent magnets II (11) and III (13) are axially magnetized annular permanent magnets with opposite magnetization directions. The permanent magnet II (11) is located between the right pole shoe (10) and the intermediate pole shoe (12). The left side of the right pole shoe (10) has an annular boss with an outer diameter equal to the inner diameter of the permanent magnet II (11). The right side of the intermediate pole shoe (12) has an annular boss with an outer diameter equal to the inner diameter of the permanent magnet II (11). The permanent magnet II (11) provides radial and axial positioning; the permanent magnet III (13) is located between the intermediate pole shoe (12) and the left pole shoe (14). The left side of the intermediate pole shoe (12) is provided with an annular boss whose outer diameter is the same as the inner diameter of the permanent magnet III (13), and the right side of the left pole shoe (14) is provided with an annular boss whose outer diameter is the same as the inner diameter of the permanent magnet III (13), providing radial and axial positioning for the permanent magnet III (13);

[0029] The right pole shoe (10) has an annular groove on each side of its radial through hole, and the pole shoe rubber rings I (1001) and II (1002) are installed in the corresponding grooves; the middle pole shoe (12) has an annular groove on each side of its radial through hole, and the pole shoe rubber rings III (1201) and IV (1202) are installed in the corresponding grooves; the left pole shoe (14) has an annular groove on each side of its radial through hole, and the pole shoe rubber rings V (1401) and VI (1402) are installed in the corresponding grooves. The inner surfaces of the right pole shoe (10), the middle pole shoe (12), and the left pole shoe (14) are respectively provided with a number of pole teeth. Preferably, the number of pole teeth is 1 to 20. There is a gap between the corresponding position of the magnetic bushing (4) and the outer circular surface of the magnetic bushing (4). The gap ranges from 0.05 to 0.3 mm. Magnetic liquid (5) is injected into the gap. Under the action of the magnetic field, the magnetic liquid (5) gathers at the pole teeth on the inner surfaces of the right pole shoe (10), the middle pole shoe (12), and the left pole shoe (14) to form a magnetic liquid dynamic seal.

[0030] When the equipment operates in a nuclear radiation environment for a long time, due to the effects of nuclear radiation and high temperature, the original magnetic liquid (5) will be lost to a certain extent. Take out the set screws II (104), III (106), and IV (108), and inject the magnetic liquid (5) into the open magnetic liquid (5) replenishment channel II, magnetic liquid (5) replenishment channel III, and magnetic liquid (5) replenishment channel IV through the syringe (19). Under the action of the magnetic field, the replenished magnetic liquid (5) gathers at several pole teeth on the inner side of the right pole shoe (10), the middle pole shoe (12), and the left pole shoe (14), and reconstructs the magnetic liquid dynamic seal. This allows for the rapid replenishment of the magnetic liquid (5) inside without disassembling the internal structure of the long-life nuclear radiation and dustproof magnetic liquid sealing device, reducing the complexity of operation, improving the overall sealing effect, and ensuring the pressure resistance and reliability of the long-life nuclear radiation and dustproof magnetic liquid sealing device.

[0031] The outer surface of the magnetic bushing (4) is provided with three annular grooves, into which snap rings I (402), II (403) and III (404) are respectively placed; snap ring I (402) provides axial positioning for the inner ring of the right bearing (8), and snap rings II (403) and III (404) provide axial positioning for the inner ring of the left bearing (16), ensuring that the right bearing (8) is a floating end and the left bearing (16) is a fixed end; the magnetic isolation ring I (7) is located between the right bearing (8) and the right pole shoe (10), and together with the magnetic isolation ring II (9), provides axial positioning for the outer ring of the right bearing (8); the magnetic isolation ring III (15) is located between the left pole shoe (14) and the left bearing (16), and together with the magnetic isolation ring IV (17), provides axial positioning for the outer ring of the left bearing (16); the inner surface of the magnetic bushing (4) is provided with two annular grooves, into which inner rubber rings I (401) and II (405) are respectively placed;

[0032] The magnetic bushing (4) has a shoulder on the right side at the position of the clamping clamp (3) assembly, which provides axial positioning for the clamping clamp (3) assembly; the right end face of the magnetic bushing (4) has several grooves along the circumferential direction, preferably 2 to 10 grooves, the groove depth is greater than the thickness of the clamping clamp (3) and less than the distance between the inner rubber ring I (401) and the right end face of the magnetic bushing (4); the clamping clamp (3) has several radial threaded holes along the circumferential direction, preferably 2 to 10 threaded holes, the threaded holes are staggered from the several grooves on the right end of the magnetic bushing (4), the set screw VI (301) is installed in the threaded hole, pressing the magnetic bushing (4) assembly, and fixing the long-life nuclear radiation protection and dust protection magnetic liquid sealing device on the rotating shaft of the nuclear energy equipment;

[0033] The permanent magnets I (6), II (11), III (13), and IV (18) are made of materials with good radiation resistance and high temperature resistance, such as samarium cobalt permanent magnets.

[0034] The magnetic bushing (4), right pole shoe (10), middle pole shoe (12), and left pole shoe (14) are made of magnetically conductive materials with good radiation resistance or high saturation magnetic induction intensity, such as cobalt steel, iron-cobalt-vanadium soft magnetic alloy, etc.

[0035] The magnetic fluid (5) is selected to be a radiation-resistant magnetic fluid.

Claims

1. A long-life, radiation-proof, dust-proof magnetic liquid sealing device, characterized in that, The device includes: a housing (1), an outer rubber ring I (101), a set screw I (102), an outer rubber ring II (103), a set screw II (104), an outer rubber ring III (105), a set screw III (106), an outer rubber ring IV (107), a set screw IV (108), an outer rubber ring V (109), a set screw V (110), an outer rubber ring VI (111), a threaded end cap (2), a clamping clamp (3), a set screw VI (301), a magnetic bushing (4), an inner rubber ring I (401), a retaining ring I (402), a retaining ring II (403), a retaining ring III (404), and an inner rubber ring. II (405), Magnetic Fluid (5), Permanent Magnet I (6), Magnetic Isolation Ring I (7), Right Bearing (8), Magnetic Isolation Ring II (9), Right Pole Shoe (10), Pole Shoe Rubber Ring I (1001), Pole Shoe Rubber Ring II (1002), Permanent Magnet II (11), Intermediate Pole Shoe (12), Pole Shoe Rubber Ring III (1201), Pole Shoe Rubber Ring IV (1202), Permanent Magnet III (13), Left Pole Shoe (14), Pole Shoe Rubber Ring V (1401), Pole Shoe Rubber Ring VI (1402), Magnetic Isolation Ring III (15), Left Bearing (16), Magnetic Isolation Ring IV (17), Permanent Magnet IV (18), Syringe (19); The connections between the various parts of the device are as follows: the outer shell (1), outer rubber ring I (101), set screw I (102), outer rubber ring II (103), set screw II (104), outer rubber ring III (105), set screw III (106), outer rubber ring IV (107), set screw IV (108), outer rubber ring V (109), set screw V (110), and outer rubber ring VI (111) constitute the outer shell assembly; the clamping clamp (3) and set screw VI (301) constitute the clamping clamp assembly; the magnetic bushing (4), inner rubber ring I (401), snap ring I (402), snap ring II (403), snap ring III (404), and inner rubber ring II (405) constitute the magnetic bushing assembly; and the right pole shoe (10), pole shoe rubber ring I (1001), and pole shoe rubber ring II (1002) constitute the right pole shoe assembly. The intermediate pole shoe (12), pole shoe rubber ring III (1201), and pole shoe rubber ring IV (1202) constitute the intermediate pole shoe assembly. The left pole shoe (14), pole shoe rubber ring V (1401), and pole shoe rubber ring VI (1402) constitute the left pole shoe assembly. The permanent magnet IV (18), magnetic shielding ring IV (17), left bearing (16), magnetic shielding ring III (15), left pole shoe assembly, permanent magnet III (13), intermediate pole shoe assembly, permanent magnet II (11), right pole shoe assembly, magnetic shielding ring II (9), right bearing (8), magnetic shielding ring I (7), and permanent magnet I (6) are installed on the magnetic guide sleeve assembly from left to right, and then installed into the outer shell assembly. The outer shell assembly and the threaded end cap (2) are connected by threads. The clamping clamp (3) is connected to the magnetic guide sleeve assembly by the set screw VI (301), which fixes the entire sealing device on the rotating shaft of the nuclear energy equipment. The magnetic shielding ring IV (17) has a radial through hole, and the outer shell (1) has a radial threaded hole at the corresponding position of the through hole of the magnetic shielding ring IV (17). The threaded hole and the through hole are concentric. The set screw I (102) is installed in the threaded hole to form a closed magnetic liquid replenishment injection channel I. The left pole shoe (14) has a radial through hole, and the outer shell (1) has a radial threaded hole at the corresponding position of the through hole of the left pole shoe (14). The threaded hole and the through hole are concentric. The set screw II (104) is installed in the threaded hole to form a closed magnetic liquid replenishment channel I. Supplementary injection channel II; the intermediate pole shoe (12) is provided with a radial through hole, and the outer shell (1) is provided with a radial threaded hole at the corresponding position of the through hole of the intermediate pole shoe (12). The threaded hole and the through hole are concentric. The set screw III (106) is installed in the threaded hole, forming a closed magnetic liquid supplementary injection channel III; the right pole shoe (10) is provided with a radial through hole, and the outer shell (1) is provided with a radial threaded hole at the corresponding position of the through hole of the right pole shoe (10). The threaded hole and the through hole are concentric. The set screw IV (108) is installed in the threaded hole, forming a closed magnetic liquid supplementary injection channel III; the right pole shoe (10) is provided with a radial through hole, and the outer shell (1) is provided with a radial threaded hole at the corresponding position of the through hole of the right pole shoe (10). The threaded hole and the through hole are concentric. The set screw IV (108) is installed in the threaded hole, forming a closed magnetic liquid supplementary injection channel III; A closed magnetic liquid replenishment channel IV; a radial through hole is provided on the magnetic shielding ring I (7), and a radial threaded hole is provided on the outer shell (1) at the corresponding position of the through hole of the magnetic shielding ring I (7). The threaded hole and the through hole are concentric. The set screw V (110) is installed in the threaded hole to form a closed magnetic liquid replenishment channel V; on the outer shell (1), the set screw I (102) is located to the left, between set screw I (102) and set screw II (104), between set screw II (104) and set screw III (106), and between set screw III (106) An annular groove is provided between the outer rubber ring I (101), outer rubber ring II (103), outer rubber ring III (105), outer rubber ring IV (107), outer rubber ring V (109), and outer rubber ring VI (111) on the right side of the outer rubber ring (1). An annular boss is provided on the outer side of the left end face of the outer shell (1) for positioning and connecting the long-life anti-nuclear radiation and dustproof magnetic liquid sealing device with nuclear energy equipment.

2. The long-life, radiation-proof, dust-proof magnetic liquid sealing device according to claim 1, characterized in that: The permanent magnet I (6) and permanent magnet IV (18) are axially magnetized annular permanent magnets. The permanent magnet I (6) is located between the threaded end cap (2) and the magnetic isolation ring I (7). The left end face of the threaded end cap (2) is provided with an annular boss to provide axial positioning for the permanent magnet I (6). The right end face of the magnetic isolation ring I (7) is provided with an annular boss with an inner diameter that is the same as the outer diameter of the permanent magnet I (6) to provide radial positioning for the permanent magnet I (6). The permanent magnet IV (18) is located between the left end face of the outer shell (1) and the magnetic isolation ring IV (17). The inner side of the left end face of the outer shell (1) is provided with an annular boss to provide axial positioning for the permanent magnet IV (18). The left end face of the magnetic isolation ring IV (17) is provided with an annular boss with an inner diameter that is the same as the outer diameter of the permanent magnet IV (18) to provide radial positioning for the permanent magnet IV (18). There is a gap between the outer circular surface of the permanent magnet I (6) and the corresponding position of the inner circular surface of the outer shell (1), and there is a gap between the inner circular surface of the permanent magnet I (6) and the corresponding position of the outer circular surface of the magnetic bushing (4). Magnetic liquid (5) is injected into the gap. Due to the tip effect, the magnetic liquid (5) gathers at the left and right tip rings of the outer circular surface and the left and right tip rings of the inner circular surface of the permanent magnet I (6) and the permanent magnet IV (18) under the action of the magnetic field, forming a magnetic liquid static and dynamic seal. When the equipment operates in a nuclear radiation environment for a long time, the original magnetic liquid (5) will be lost due to the effects of nuclear radiation and high temperature. Take out the set screw I (102) and set screw V (110), and inject the magnetic liquid (5) into the opened magnetic liquid replenishment channel I and magnetic liquid replenishment channel V through the syringe (19). Under the action of the magnetic field, the replenished magnetic liquid (5) gathers at the left and right tip rings on the outer circular surface and the left and right tip rings on the inner circular surface of the permanent magnet I (6) and permanent magnet IV (18), and reconstructs the static and dynamic seal of the magnetic liquid.

3. A long-life, radiation-proof, dust-proof magnetic liquid sealing device according to claim 1 or 2, characterized in that: The permanent magnets II (11) and III (13) are axially magnetized annular permanent magnets with opposite magnetization directions; the permanent magnet II (11) is located between the right pole shoe (10) and the intermediate pole shoe (12). The left side of the right pole shoe (10) is provided with an annular boss whose outer diameter is the same as the inner diameter of the permanent magnet II (11), and the right side of the intermediate pole shoe (12) is provided with an annular boss whose outer diameter is the same as the inner diameter of the permanent magnet II (11). The permanent magnet II (11) provides radial and axial positioning; the permanent magnet III (13) is located between the intermediate pole shoe (12) and the left pole shoe (14). The left side of the intermediate pole shoe (12) is provided with an annular boss whose outer diameter is the same as the inner diameter of the permanent magnet III (13), and the right side of the left pole shoe (14) is provided with an annular boss whose outer diameter is the same as the inner diameter of the permanent magnet III (13), providing radial and axial positioning for the permanent magnet III (13); The right pole shoe (10) has an annular groove on each side of the radial through hole, and the pole shoe rubber ring I (1001) and pole shoe rubber ring II (1002) are installed in the corresponding grooves; the middle pole shoe (12) has an annular groove on each side of the radial through hole, and the pole shoe rubber ring III (1201) and pole shoe rubber ring IV (1202) are installed in the corresponding grooves; the left pole shoe (14) has an annular groove on each side of the radial through hole, and the pole shoe rubber ring V (1401) and pole shoe rubber ring VI (1402) are installed in the corresponding grooves; the inner surfaces of the right pole shoe (10), the middle pole shoe (12), and the left pole shoe (14) are provided with several pole teeth, and there is a gap between them and the outer circular surface of the magnetic bushing (4). Magnetic liquid (5) is injected into the gap, and the magnetic liquid (5) gathers at several pole teeth on the inner surfaces of the right pole shoe (10), the middle pole shoe (12), and the left pole shoe (14) under the action of the magnetic field, forming a magnetic liquid dynamic seal; When the equipment operates in a nuclear radiation environment for a long time, the original magnetic fluid (5) will be lost due to the effects of nuclear radiation and high temperature. Take out the set screws II (104), III (106), and IV (108), and inject the magnetic fluid (5) into the opened magnetic fluid replenishment channel II, III, and IV through the syringe (19). Under the action of the magnetic field, the replenished magnetic fluid (5) gathers at several pole teeth on the inner side of the right pole shoe (10), the middle pole shoe (12), and the left pole shoe (14), and reconstructs the magnetic fluid dynamic seal.

4. A long-life, radiation-proof, dust-proof magnetic liquid sealing device according to any one of claims 1 or 2, characterized in that: The outer surface of the magnetic bushing (4) is provided with three annular grooves, into which snap ring I (402), snap ring II (403) and snap ring III (404) are respectively placed; snap ring I (402) provides axial positioning for the inner ring of the right bearing (8), and snap ring II (403) and snap ring III (404) provide axial positioning for the inner ring of the left bearing (16), ensuring that the right bearing (8) is a floating end and the left bearing (16) is a fixed end; the magnetic isolation ring I (7) is located between the right bearing (8) and the right pole shoe (10), and together with the magnetic isolation ring II (9), provides axial positioning for the outer ring of the right bearing (8); the magnetic isolation ring III (15) is located between the left pole shoe (14) and the left bearing (16), and together with the magnetic isolation ring IV (17), provides axial positioning for the outer ring of the left bearing (16); the inner surface of the magnetic bushing (4) is provided with two annular grooves, into which inner rubber ring I (401) and inner rubber ring II (405) are respectively placed. The magnetic bushing (4) has a shoulder on the right side at the clamping assembly position to provide axial positioning for the clamping assembly; the right end face of the magnetic bushing (4) has several grooves along the circumferential direction, the groove depth is greater than the thickness of the clamping clamp (3) and less than the distance between the inner rubber ring I (401) and the right end face of the magnetic bushing (4); the clamping clamp (3) has several radial threaded holes along the circumferential direction, the threaded holes are offset from several grooves on the right end of the magnetic bushing (4), the set screw VI (301) is installed in the threaded hole to press the magnetic bushing assembly and fix the long-life nuclear radiation protection and dust protection magnetic liquid sealing device on the rotating shaft of the nuclear energy equipment.

5. A long-life, radiation-proof, dust-proof magnetic liquid sealing device according to any one of claims 1 or 2, characterized in that: The permanent magnets I (6), II (11), III (13), and IV (18) are made of materials with good radiation resistance and high temperature resistance. The magnetic bushing (4), right pole shoe (10), middle pole shoe (12), and left pole shoe (14) are made of magnetically conductive materials with good radiation resistance or high saturation magnetic induction intensity. The magnetic liquid (5) is selected to be a radiation-resistant magnetic liquid.

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