Long-service-life nuclear-radiation-proof dustproof magnetic liquid sealing device

Abstract

The invention discloses a long-service-life nuclear-radiation-proof 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 conduction shaft sleeve assembly, magnetic liquid, four permanent magnets, four magnetism isolating rings, a right bearing, a right pole shoe assembly, a middle pole shoe assembly, a left pole shoe assembly, a left bearing and an injector. Magnetic liquid is injected between the permanent magnet I, the permanent magnet IV and the shell to form a magnetic liquid static seal, and magnetic liquid is injected between the permanent magnet I, the permanent magnet IV and the magnetic conductive shaft 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 lost, the fastening screw on the shell is taken out, the magnetic liquid is injected from the opened magnetic liquid supplementing and injecting channel through an injector, and under the action of a magnetic field, the injected magnetic liquid reforms magnetic liquid sealing, so that the maintenance operation complexity is reduced, and the pressure resistance of the device is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear energy, and in particular relates to a long-life nuclear radiation and dustproof magnetic liquid sealing device. Background Art

[0002] In the field of nuclear energy, when many nuclear power equipment in nuclear reactors are in operation, they will not only be exposed to nuclear radiation in a variety of high-energy radiation environments, but also because of the presence of various radioactive powder materials in different working media, which will have a significant impact on the various components of nuclear power equipment. For example, nuclear radiation will destroy the components of traditional seals, thereby affecting the pressure resistance and service life of the seals; radioactive dust enters the bearings to increase the operating torque, and in severe cases, causes equipment jams. At the same time, due to the particularity of the radiation environment in which it is located, nuclear power equipment must ensure long-term stable operation and minimize the number, steps and duration of inspections and repairs. Under such special conditions, it is necessary to propose a magnetic liquid sealing device that can operate for a long life, is resistant to nuclear radiation, and is dustproof. Summary of the invention

[0003] The present invention proposes a magnetic liquid sealing device installed on the rotating shaft of nuclear energy equipment, having good radiation protection performance, strong pressure resistance, and long-life operation in a radioactive powder environment. The purpose is to prevent nuclear radiation from damaging the components in the magnetic liquid sealing device, prevent radioactive powder from entering the interior of the magnetic liquid seal to cause equipment jamming, improve the pressure resistance of the sealing device, and reduce the complexity of operation by designing a magnetic liquid replenishment injection channel, so as to achieve rapid replacement of the magnetic liquid inside without disassembling the internal structure of the magnetic liquid seal, thereby ensuring the long-term operation reliability of the sealing device.

[0004] The technical scheme adopted by the present invention is: a long-life nuclear radiation and dustproof magnetic liquid sealing device, which comprises: 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 cover (2), a clamping hoop (3), a set screw VI (301), a magnetic shaft sleeve (4), an inner rubber ring I (401), a retaining spring I (402), a retaining spring II (403), a retaining spring III (404), a retaining spring III (405), a retaining spring III (406), a retaining spring IV (407), a retaining spring IV (408), an outer rubber ring V (109), a retaining screw V (110), an outer rubber ring VI (111), a threaded end cover (2), a clamping hoop (3), a retaining ... 03), retaining spring III (404), inner rubber ring II (405), magnetic liquid (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), middle 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 connection between the various parts of the device is formed as follows: the outer shell (1), the outer rubber ring I (101), the set screw I (102), the outer rubber ring II (103), the set screw II (104), the outer rubber ring III (105), the set screw III (106), the outer rubber ring IV (107), the set screw IV (108), the outer rubber ring V (109), the set screw V (110), and the outer rubber ring VI (111) constitute the outer shell (1) assembly, and the card The clamping hoop (3) and the set screw VI (301) constitute a clamping hoop (3) assembly; the magnetic sleeve (4), the inner rubber ring I (401), the retaining spring I (402), the retaining spring II (403), the retaining spring III (404), and the inner rubber ring II (405) constitute a magnetic sleeve (4) assembly; the right pole shoe (10), the pole shoe rubber ring I (1001), and the pole shoe rubber ring II (1002) constitute a right pole shoe (10) assembly; the middle pole shoe (12), The pole shoe rubber ring III (1201) and the pole shoe rubber ring IV (1202) constitute the middle pole shoe (12) assembly, and the left pole shoe (14), the pole shoe rubber ring V (1401) and the pole shoe rubber ring 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 middle pole shoe (12) assembly, the permanent magnet Ⅱ (11), right pole shoe (10) assembly, magnetic isolation ring Ⅱ (9), right bearing (8), magnetic isolation ring Ⅰ (7), permanent magnet Ⅰ (6) are sequentially installed on the magnetic sleeve (4) assembly from left to right, and then installed in the shell (1) assembly; the shell (1) assembly and the threaded end cover (2) are connected by threads; the clamping hoop (3) is connected to the magnetic sleeve (4) assembly by a set screw Ⅵ (301), and the entire sealing device is fixed on the rotating shaft of the nuclear energy equipment.

[0006] The magnetic isolation ring IV (17) is provided with a radial through hole, the housing (1) is provided with a radial threaded hole at a position corresponding to the through hole of the magnetic isolation ring IV (17), the threaded hole and the through hole are ensured to be 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) is provided with a radial through hole, the housing (1) is provided with a radial threaded hole at a position corresponding to the through hole of the left pole shoe (14), the threaded hole and the through hole are ensured to be concentric, the set screw II (104) is installed in the threaded hole, forming a closed magnetic liquid (5) replenishment injection channel I. 5) replenishing injection channel II; the middle pole shoe (12) is provided with a radial through hole, the housing (1) is provided with a radial threaded hole at a position corresponding to the through hole of the middle pole shoe (12), the threaded hole and the through hole are ensured to be concentric, the set screw III (106) is installed in the threaded hole, forming a closed magnetic liquid (5) replenishing injection channel III; the right pole shoe (10) is provided with a radial through hole, the housing (1) is provided with a radial threaded hole at a position corresponding to the through hole of the right pole shoe (10), the threaded hole and the through hole are ensured to be concentric, the set screw IV (108) is installed in the threaded hole, forming The magnetic liquid (5) is replenished and injected into a closed channel IV; the magnetic isolation ring I (7) is provided with a radial through hole, the housing (1) is provided with a radial threaded hole at a position corresponding to the through hole of the magnetic isolation ring I (7), the threaded hole and the through hole are ensured to be concentric, the set screw V (110) is installed in the threaded hole, and the magnetic liquid (5) is replenished and injected into a closed channel V; the left side of the set screw I (102) on the housing (1), between the set screw I (102) and the set screw II (104), between the set screw II (104) and the set screw III (106), and the set screw III An annular groove is respectively provided between the outer rubber ring (106) and 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), and the outer rubber ring I (101), the outer rubber ring II (103), the outer rubber ring III (105), the outer rubber ring IV (107), the outer rubber ring V (109), and the outer rubber ring VI (111) are installed in the corresponding grooves; an annular boss is provided on the outer side of the left end surface of the housing (1), which is used for positioning and connecting the long-life anti-nuclear radiation and dustproof magnetic liquid sealing device with nuclear energy equipment;

[0007] 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 cover (2) and the magnetic isolation ring I (7); the left end face of the threaded end cover (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 housing (1) and the magnetic isolation ring IV (17); the inner side of the left end face of the housing (1) is provided with an annular boss to provide axial positioning for the permanent magnet IV (18); the magnetic isolation ring The left end surface of the ring IV (17) is provided with an annular boss having an inner diameter which is the same as the outer diameter of the permanent magnet IV (18), so as to provide radial positioning for the permanent magnet IV (18); there is a gap between the outer surfaces of the permanent magnets I (6) and IV (18) and the corresponding positions of the inner surface of the housing (1); there is a gap between the inner surfaces of the permanent magnets I (6) and IV (18) and the corresponding positions of the outer surface of the magnetic sleeve (4); a magnetic liquid (5) is injected into the gap, and the magnetic liquid (5) is gathered at the left and right tip rings of the outer surfaces and the left and right tip rings of the inner surfaces of the permanent magnets I (6) and IV (18) under the action of the magnetic field, so as to form a static and dynamic seal of the magnetic liquid;

[0008] The permanent magnet II (11) and the permanent magnet 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 middle pole shoe (12); the left side of the right pole shoe (10) is provided with an annular boss with an outer diameter the same as the inner diameter of the permanent magnet II (11); the right side of the middle pole shoe (12) is provided with an annular boss with an outer diameter 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 middle pole shoe (12) and the left pole shoe (14); the left side of the middle pole shoe (12) is provided with an annular boss with an outer diameter the same as the inner diameter of the permanent magnet III (13); the right side of the left pole shoe (14) is provided with an annular boss with an outer diameter the same as the inner diameter of the permanent magnet III (13), providing radial and axial positioning for the permanent magnet III (13);

[0009] An annular groove is respectively provided on both sides of the radial through hole of the right pole shoe (10), and the pole shoe rubber ring I (1001) and the pole shoe rubber ring II (1002) are installed in the corresponding grooves; an annular groove is respectively provided on both sides of the radial through hole of the middle pole shoe (12), and the pole shoe rubber ring III (1201) and the pole shoe rubber ring IV (1202) are installed in the corresponding grooves; an annular groove is respectively provided on both sides of the radial through hole of the left pole shoe (14), and the pole shoe rubber ring V (1401) and the pole shoe rubber ring VI (1402) are installed in the corresponding grooves; the inner side surfaces of the right pole shoe (10), the middle pole shoe (12) and the left pole shoe (14) are respectively provided with a plurality of pole teeth, and there is a gap between the corresponding positions of the outer circumferential surface of the magnetic conductive shaft sleeve (4), and the magnetic liquid (5) is injected into the gap, and the magnetic liquid (5) is gathered at the plurality of pole teeth on the inner side 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, so as to form a magnetic liquid dynamic seal;

[0010] The outer circumferential surface of the magnetic sleeve (4) is provided with three annular grooves, into which a retaining spring I (402), a retaining spring II (403) and a retaining spring III (404) are placed respectively; retaining spring I (402) provides axial positioning for the inner ring of the right bearing (8), retaining spring II (403) and retaining spring III (404) provide axial positioning for the inner ring of the left bearing (16), thereby 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 circumferential surface of the magnetic sleeve (4) is provided with two annular grooves, into which an inner rubber ring I (401) and an inner rubber ring II (405) are placed respectively;

[0011] The right side of the magnetic sleeve (4) is provided with a shoulder at the position of the clamping hoop (3) assembly to provide axial positioning for the clamping hoop (3) assembly; the right end face of the magnetic sleeve (4) is provided with a plurality of grooves along the circumferential direction, the depth of the grooves being greater than the thickness of the clamping hoop (3) and less than the distance between the inner rubber ring I (401) and the right end face of the magnetic sleeve (4); the clamping hoop (3) is provided with a plurality of radial threaded holes along the circumferential direction, the threaded holes being staggered with the plurality of grooves at the right end of the magnetic sleeve (4), the set screw VI (301) being installed in the threaded hole to compress the magnetic sleeve (4) assembly to fix the long-life nuclear radiation and dustproof magnetic liquid sealing device on the rotating shaft of the nuclear energy equipment.

[0012] Compared with the conventional magnetic liquid sealing device, the present invention has the following beneficial effects: a magnetic liquid (5) is injected between the outer circumferential surfaces of the permanent magnets I (6) and IV (18) and the corresponding positions of the inner circumferential surface of the housing (1) to form a magnetic liquid static seal; a magnetic liquid (5) is injected between the inner circumferential surfaces of the permanent magnets I (6) and IV (18) and the corresponding positions of the outer circumferential surface of the magnetic shaft sleeve (4) to form a magnetic liquid dynamic seal, thereby preventing radioactive powder from entering the interior of the long-life nuclear radiation and dustproof magnetic liquid sealing device through the gap between the housing (1) and the magnetic shaft sleeve (4), the gap between the housing (1) and the threaded end cover (2), and the gap between the threaded end cover (2) and the magnetic shaft sleeve (4), ... threaded end cover (2) and the magnetic shaft sleeve (4), thereby preventing radioactive powder from entering the interior of the long-life nuclear radiation and dustproof magnetic liquid sealing device through the gap between the housing (1) and the magnetic shaft sleeve (4), the gap between the housing (1) and the threaded end cover (2), and the threaded end cover (2) and the magnetic shaft sleeve (4), thereby preventing radioactive powder from entering the interior of the long-life nuclear radiation and dustproof magnetic liquid sealing device through the gap between the housing (1) and the magnetic shaft sleeve (4), the gap between the housing (1) and the threaded end cover (2), and the threaded end cover (2) and the magnetic shaft sleeve The right bearing (8) and the left bearing (16) are prevented from getting stuck due to the entry of radioactive powder, thereby ensuring that the sealing device operates stably and reliably; when the equipment operates for a long time in a nuclear radiation environment, due to the influence of nuclear radiation and high temperature, the original magnetic liquid (5) may be lost to a certain extent, and the magnetic liquid (5) can be injected from the magnetic liquid (5) replenishment injection channel through the injector (19), thereby realizing 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.

[0013] The method of replenishing the magnetic liquid (5) of the present invention is as follows: taking out the set screw I (102) and the set screw V (110), injecting the magnetic liquid (5) from the opened magnetic liquid (5) replenishing injection channel I and the magnetic liquid (5) replenishing injection channel V through the syringe (19); under the action of the magnetic field, the replenished magnetic liquid (5) is gathered at the left and right tip rings of the outer circumference and the left and right tip rings of the inner circumference of the permanent magnet I (6) and the permanent magnet IV (18), and the static and dynamic density of the magnetic liquid is re-formed. The invention relates to a method for sealing the magnetic liquid. ... BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a long-life nuclear radiation and dustproof magnetic liquid sealing device according to an embodiment of the present invention.

[0015] Figure 1In: housing (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 hoop (3), set screw Ⅵ (301), magnetic sleeve (4), inner rubber ring Ⅰ (401), retaining ring Ⅰ (402), retaining ring Ⅱ (403), retaining ring Ⅲ (404), inner rubber ring Rubber ring II (405), magnetic liquid (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), middle 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 It is a partial enlarged view of point A of an embodiment of the present invention.

[0017] Figure 3 It is a schematic diagram of supplementary injection of magnetic liquid according to an embodiment of the present invention.

[0018] Figure 4 It is a partial enlarged view of point B of an embodiment of the present invention.

[0019] Figure 4 Middle: Syringe (19).

[0020] Figure 5 It is a CC cross-sectional view of an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The following is a detailed description of an embodiment of the present invention, which is only used to explain the present invention and cannot be understood as any form of limitation of the present invention. The present invention is further described with reference to the accompanying drawings:

[0022] A long-life nuclear radiation and dustproof magnetic liquid sealing device, comprising: 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 cover (2), a clamping hoop (3), a set screw VI (301), a magnetic shaft sleeve (4), an inner rubber ring I (401), a retaining spring I (402), a retaining spring II (403), a retaining spring Ⅲ (404), inner rubber ring Ⅱ (405), magnetic liquid (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), middle 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 connection between the various parts of the device is formed as follows: the outer shell (1), the outer rubber ring I (101), the set screw I (102), the outer rubber ring II (103), the set screw II (104), the outer rubber ring III (105), the set screw III (106), the outer rubber ring IV (107), the set screw IV (108), the outer rubber ring V (109), the set screw V (110), and the outer rubber ring VI (111) constitute the outer shell (1) assembly, and the card The clamping hoop (3) and the set screw VI (301) constitute a clamping hoop (3) assembly; the magnetic sleeve (4), the inner rubber ring I (401), the retaining spring I (402), the retaining spring II (403), the retaining spring III (404), and the inner rubber ring II (405) constitute a magnetic sleeve (4) assembly; the right pole shoe (10), the pole shoe rubber ring I (1001), and the pole shoe rubber ring II (1002) constitute a right pole shoe (10) assembly; the middle pole shoe (12), The pole shoe rubber ring III (1201) and the pole shoe rubber ring IV (1202) constitute the middle pole shoe (12) assembly, and the left pole shoe (14), the pole shoe rubber ring V (1401) and the pole shoe rubber ring 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 middle pole shoe (12) assembly, the permanent magnet Ⅱ (11), right pole shoe (10) assembly, magnetic isolation ring Ⅱ (9), right bearing (8), magnetic isolation ring Ⅰ (7), permanent magnet Ⅰ (6) are sequentially installed on the magnetic sleeve (4) assembly from left to right, and then installed in the shell (1) assembly; the shell (1) assembly and the threaded end cover (2) are connected by threads; the clamping hoop (3) is connected to the magnetic sleeve (4) assembly by a set screw Ⅵ (301), and the entire sealing device is fixed on the rotating shaft of the nuclear energy equipment.

[0024] The magnetic isolation ring IV (17) is provided with a radial through hole, the housing (1) is provided with a radial threaded hole at a position corresponding to the through hole of the magnetic isolation ring IV (17), the threaded hole and the through hole are ensured to be 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) is provided with a radial through hole, the housing (1) is provided with a radial threaded hole at a position corresponding to the through hole of the left pole shoe (14), the threaded hole and the through hole are ensured to be concentric, the set screw II (104) is installed in the threaded hole, forming a closed magnetic liquid (5) replenishment injection channel I. 5) replenishing injection channel II; the middle pole shoe (12) is provided with a radial through hole, the housing (1) is provided with a radial threaded hole at a position corresponding to the through hole of the middle pole shoe (12), the threaded hole and the through hole are ensured to be concentric, the set screw III (106) is installed in the threaded hole, forming a closed magnetic liquid (5) replenishing injection channel III; the right pole shoe (10) is provided with a radial through hole, the housing (1) is provided with a radial threaded hole at a position corresponding to the through hole of the right pole shoe (10), the threaded hole and the through hole are ensured to be concentric, the set screw IV (108) is installed in the threaded hole, forming The magnetic liquid (5) is replenished and injected into a closed channel IV; the magnetic isolation ring I (7) is provided with a radial through hole, the housing (1) is provided with a radial threaded hole at a position corresponding to the through hole of the magnetic isolation ring I (7), the threaded hole and the through hole are ensured to be concentric, the set screw V (110) is installed in the threaded hole, and the magnetic liquid (5) is replenished and injected into a closed channel V; the left side of the set screw I (102) on the housing (1), between the set screw I (102) and the set screw II (104), between the set screw II (104) and the set screw III (106), and the set screw III An annular groove is respectively provided between the outer rubber ring (106) and 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), and the outer rubber ring I (101), the outer rubber ring II (103), the outer rubber ring III (105), the outer rubber ring IV (107), the outer rubber ring V (109), and the outer rubber ring VI (111) are installed in the corresponding grooves; an annular boss is provided on the outer side of the left end surface of the housing (1), which is used for positioning and connecting the long-life anti-nuclear radiation and dustproof magnetic liquid sealing device with nuclear energy equipment;

[0025] The permanent magnet I (6) and the permanent magnet IV (18) are axially magnetized annular permanent magnets; the permanent magnet I (6) is located between the threaded end cover (2) and the magnetic isolation ring I (7); the left end face of the threaded end cover (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 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 housing (1) and the magnetic isolation ring IV (17); the inner side of the left end face of the housing (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 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 circumferential surfaces of the permanent magnets I (6) and IV (18) and the corresponding positions of the inner circumferential surfaces of the housing (1); there is a gap between the inner circumferential surfaces of the permanent magnets I (6) and IV (18) and the corresponding positions of the outer circumferential surfaces of the magnetic conductive sleeve (4); the gap value range is 0.05 to 0.3 mm; a magnetic liquid (5) is injected into the gap; due to the tip effect, the magnetic liquid (5) is gathered on the outer circumferential surfaces of the permanent magnets I (6) and 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, preventing radioactive powder from entering the interior of the long-life nuclear radiation and dustproof magnetic liquid sealing device through the gap between the outer shell (1) and the magnetic shaft sleeve (4), the gap between the outer shell (1) and the threaded end cover (2), and the gap between the threaded end cover (2) and the magnetic shaft sleeve (4), preventing the right bearing (8) and the left bearing (16) from getting stuck due to the entry of radioactive powder, and ensuring the stable and reliable operation of the sealing device;

[0027] When the equipment is operated for a long time in a nuclear radiation environment, and the original magnetic liquid (5) has a certain loss due to the influence of nuclear radiation and high temperature, the set screw I (102) and the set screw V (110) are taken out, and the magnetic liquid (5) is injected into the opened magnetic liquid (5) replenishing injection channel I and the magnetic liquid (5) replenishing injection channel V through the syringe (19). Under the action of the magnetic field, the replenished magnetic liquid (5) is gathered at the left and right tip rings of the outer circumference and the left and right tip rings of the inner circumference of the permanent magnet I (6) and the permanent magnet IV (18), and the magnetic liquid static and dynamic seal is re-formed, so that the magnetic liquid (5) inside can be quickly replenished without disassembling the internal structure of the long-life nuclear radiation and dustproof magnetic liquid sealing device, thereby 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 magnet II (11) and the permanent magnet 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 middle pole shoe (12); the left side of the right pole shoe (10) is provided with an annular boss with an outer diameter the same as the inner diameter of the permanent magnet II (11); the right side of the middle pole shoe (12) is provided with an annular boss with an outer diameter 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 middle pole shoe (12) and the left pole shoe (14); the left side of the middle pole shoe (12) is provided with an annular boss with an outer diameter the same as the inner diameter of the permanent magnet III (13); the right side of the left pole shoe (14) is provided with an annular boss with an outer diameter the same as the inner diameter of the permanent magnet III (13), providing radial and axial positioning for the permanent magnet III (13);

[0029] An annular groove is respectively provided on both sides of the radial through hole of the right pole shoe (10), and the pole shoe rubber ring I (1001) and the pole shoe rubber ring II (1002) are installed in the corresponding grooves; an annular groove is respectively provided on both sides of the radial through hole of the middle pole shoe (12), and the pole shoe rubber ring III (1201) and the pole shoe rubber ring IV (1202) are installed in the corresponding grooves; an annular groove is respectively provided on both sides of the radial through hole of the left pole shoe (14), and the pole shoe rubber ring V (1401) and the pole shoe rubber ring VI (1402) are installed in the corresponding grooves. In the corresponding grooves; the inner sides of the right pole shoe (10), the middle pole shoe (12), and the left pole shoe (14) are respectively provided with a plurality of pole teeth, preferably, the number of the pole teeth is 1 to 20, and there is a gap between the corresponding positions of the outer circumferential surface of the magnetic conductive sleeve (4), and the gap value range is 0.05 to 0.3 mm. The magnetic liquid (5) is injected into the gap, and the magnetic liquid (5) is gathered at the plurality of pole teeth on the inner sides 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;

[0030] When the equipment is operated for a long time in a nuclear radiation environment, and the original magnetic liquid (5) has a certain loss due to the influence of nuclear radiation and high temperature, the set screw II (104), the set screw III (106), and the set screw IV (108) are taken out, and the magnetic liquid (5) is injected into the opened magnetic liquid (5) replenishing injection channel II, the magnetic liquid (5) replenishing injection channel III, and the magnetic liquid (5) replenishing injection channel IV through the syringe (19). Under the action of the magnetic field, the replenished magnetic liquid (5) is gathered at a plurality of pole teeth on the inner side surfaces of the right pole shoe (10), the middle pole shoe (12), and the left pole shoe (14), and the magnetic liquid dynamic seal is re-formed, so that the magnetic liquid (5) inside can be quickly replenished without disassembling the internal structure of the long-life nuclear radiation and dustproof magnetic liquid sealing device, thereby 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 circumferential surface of the magnetic sleeve (4) is provided with three annular grooves, into which a retaining spring I (402), a retaining spring II (403) and a retaining spring III (404) are placed respectively; retaining spring I (402) provides axial positioning for the inner ring of the right bearing (8), retaining spring II (403) and retaining spring III (404) provide axial positioning for the inner ring of the left bearing (16), thereby 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 circumferential surface of the magnetic sleeve (4) is provided with two annular grooves, into which an inner rubber ring I (401) and an inner rubber ring II (405) are placed respectively;

[0032] The right side of the magnetic sleeve (4) is provided with a shoulder at the position of the clamping hoop (3) assembly to provide axial positioning for the clamping hoop (3) assembly; the right end surface of the magnetic sleeve (4) is provided with a plurality of grooves along the circumferential direction, preferably, the number of the grooves is 2 to 10, the depth of the grooves is greater than the thickness of the clamping hoop (3) and less than the distance between the inner rubber ring I (401) and the right end surface of the magnetic sleeve (4); the clamping hoop (3) is provided with a plurality of radial threaded holes along the circumferential direction, preferably, the number of the threaded holes is 2 to 10, the threaded holes are staggered with the plurality of grooves at the right end of the magnetic sleeve (4), the set screw VI (301) is installed in the threaded hole to press the magnetic sleeve (4) assembly, and fix the long-life nuclear radiation and dustproof 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 shaft sleeve (4), the right pole shoe (10), the middle pole shoe (12), and the left pole shoe (14) are made of magnetic 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 liquid (5) is a radiation-resistant magnetic liquid.

Claims

1. A long-life nuclear radiation and dustproof magnetic liquid sealing device, characterized in that: The device comprises: 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 cover (2), a clamping hoop (3), a set screw VI (301), a magnetic shaft sleeve (4), an inner rubber ring I (401), a retaining spring I (402), a retaining spring II (403), a retaining spring III (404), an inner rubber ring Ⅱ (405), magnetic liquid (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), middle 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 connection between the various parts of the device is formed as follows: the outer shell (1), the outer rubber ring I (101), the set screw I (102), the outer rubber ring II (103), the set screw II (104), the outer rubber ring III (105), the set screw III (106), the outer rubber ring IV (107), the set screw IV (108), the outer rubber ring V (109), the set screw V (110), and the outer rubber ring VI (111) constitute the outer shell (1) assembly, and the card The clamping hoop (3) and the set screw VI (301) constitute a clamping hoop (3) assembly; the magnetic sleeve (4), the inner rubber ring I (401), the retaining spring I (402), the retaining spring II (403), the retaining spring III (404), and the inner rubber ring II (405) constitute a magnetic sleeve (4) assembly; the right pole shoe (10), the pole shoe rubber ring I (1001), and the pole shoe rubber ring II (1002) constitute a right pole shoe (10) assembly; the middle pole shoe (12), The pole shoe rubber ring III (1201) and the pole shoe rubber ring IV (1202) constitute the middle pole shoe (12) assembly, and the left pole shoe (14), the pole shoe rubber ring V (1401) and the pole shoe rubber ring 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 middle pole shoe (12) assembly, the permanent magnet Ⅱ (11), right pole shoe (10) assembly, magnetic isolation ring Ⅱ (9), right bearing (8), magnetic isolation ring Ⅰ (7), permanent magnet Ⅰ (6) are sequentially installed on the magnetic sleeve (4) assembly from left to right, and then installed in the shell (1) assembly; the shell (1) assembly and the threaded end cover (2) are connected by threads; the clamping hoop (3) is connected to the magnetic sleeve (4) assembly by a set screw Ⅵ (301), and the entire sealing device is fixed on the rotating shaft of the nuclear energy equipment.

2. A long-life nuclear radiation and dustproof magnetic liquid sealing device according to claim 1, characterized in that: The magnetic isolation ring IV (17) is provided with a radial through hole, the housing (1) is provided with a radial threaded hole at a position corresponding to the through hole of the magnetic isolation ring IV (17), the threaded hole and the through hole are ensured to be 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) is provided with a radial through hole, the housing (1) is provided with a radial threaded hole at a position corresponding to the through hole of the left pole shoe (14), the threaded hole and the through hole are ensured to be concentric, the set screw II (104) is installed in the threaded hole, forming a closed magnetic liquid (5) replenishment injection channel I. 5) replenishing injection channel II; the middle pole shoe (12) is provided with a radial through hole, the housing (1) is provided with a radial threaded hole at a position corresponding to the through hole of the middle pole shoe (12), the threaded hole and the through hole are ensured to be concentric, the set screw III (106) is installed in the threaded hole, forming a closed magnetic liquid (5) replenishing injection channel III; the right pole shoe (10) is provided with a radial through hole, the housing (1) is provided with a radial threaded hole at a position corresponding to the through hole of the right pole shoe (10), the threaded hole and the through hole are ensured to be concentric, the set screw IV (108) is installed in the threaded hole, forming The magnetic liquid (5) is replenished and injected into a closed channel IV; the magnetic isolation ring I (7) is provided with a radial through hole, the housing (1) is provided with a radial threaded hole at a position corresponding to the through hole of the magnetic isolation ring I (7), the threaded hole and the through hole are ensured to be concentric, the set screw V (110) is installed in the threaded hole, and the magnetic liquid (5) is replenished and injected into a closed channel V; the left side of the set screw I (102) on the housing (1), between the set screw I (102) and the set screw II (104), between the set screw II (104) and the set screw III (106), and the set screw III An annular groove is respectively provided between the outer rubber ring (106) and 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), the outer rubber ring II (103), the outer rubber ring III (105), the outer rubber ring IV (107), the outer rubber ring V (109), and the outer rubber ring VI (111) are installed in the corresponding grooves; an annular boss is provided on the outer side of the left end surface of the housing (1), which is used for positioning and connecting the long-life nuclear radiation and dustproof magnetic liquid sealing device with nuclear energy equipment.

3. A long-life nuclear radiation and dustproof magnetic liquid sealing device according to claims 1 and 2, characterized in that: The permanent magnet I (6) and the permanent magnet IV (18) are axially magnetized annular permanent magnets; the permanent magnet I (6) is located between the threaded end cover (2) and the magnetic isolation ring I (7); the left end face of the threaded end cover (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 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 housing (1) and the magnetic isolation ring IV (17); the inner side of the left end face of the housing (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 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 circumferential surfaces of the permanent magnets I (6) and IV (18) and the corresponding positions of the inner circumferential surface of the housing (1), and there is a gap between the inner circumferential surfaces of the permanent magnets I (6) and IV (18) and the corresponding positions of the outer circumferential surface of the magnetic conductive sleeve (4). Magnetic liquid (5) is injected into the gaps. Due to the tip effect, the magnetic liquid (5) gathers at the left and right tip rings of the outer circumferential surfaces and the left and right tip rings of the inner circumferential surfaces of the permanent magnets I (6) and IV (18) under the action of the magnetic field, thereby forming a magnetic liquid static and dynamic seal; When the equipment is operated for a long time in a nuclear radiation environment and the original magnetic liquid (5) has a certain loss due to the influence of nuclear radiation and high temperature, the set screw I (102) and the set screw V (110) are removed, and the magnetic liquid (5) is injected into the opened magnetic liquid (5) replenishing injection channel I and the magnetic liquid (5) replenishing injection channel V through the syringe (19). Under the action of the magnetic field, the replenished magnetic liquid (5) is gathered at the left and right tip rings of the outer circumferential surface and the left and right tip rings of the inner circumferential surface of the permanent magnet I (6) and the permanent magnet IV (18), thereby re-forming the static and dynamic seal of the magnetic liquid.

4. A long-life nuclear radiation and dustproof magnetic liquid sealing device according to claims 1 and 2, characterized in that: The permanent magnet II (11) and the permanent magnet 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 middle pole shoe (12); the left side of the right pole shoe (10) is provided with an annular boss with an outer diameter the same as the inner diameter of the permanent magnet II (11); the right side of the middle pole shoe (12) is provided with an annular boss with an outer diameter 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 middle pole shoe (12) and the left pole shoe (14); the left side of the middle pole shoe (12) is provided with an annular boss with an outer diameter the same as the inner diameter of the permanent magnet III (13); the right side of the left pole shoe (14) is provided with an annular boss with an outer diameter the same as the inner diameter of the permanent magnet III (13), providing radial and axial positioning for the permanent magnet III (13); An annular groove is respectively provided on both sides of the radial through hole of the right pole shoe (10), and the pole shoe rubber ring I (1001) and the pole shoe rubber ring II (1002) are installed in the corresponding grooves; an annular groove is respectively provided on both sides of the radial through hole of the middle pole shoe (12), and the pole shoe rubber ring III (1201) and the pole shoe rubber ring IV (1202) are installed in the corresponding grooves; an annular groove is respectively provided on both sides of the radial through hole of the left pole shoe (14), and the pole shoe rubber ring V (1401) and the pole shoe rubber ring VI (1402) are installed in the corresponding grooves; the inner side surfaces of the right pole shoe (10), the middle pole shoe (12) and the left pole shoe (14) are respectively provided with a plurality of pole teeth, and there is a gap between the corresponding positions of the outer circumferential surface of the magnetic conductive shaft sleeve (4), and the magnetic liquid (5) is injected into the gap, and the magnetic liquid (5) is gathered at the plurality of pole teeth on the inner side 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, so as to form a magnetic liquid dynamic seal; When the equipment is operated for a long time in a nuclear radiation environment and the original magnetic liquid (5) is lost to a certain extent due to the influence of nuclear radiation and high temperature, the set screws II (104), III (106) and IV (108) are removed, and the magnetic liquid (5) is injected into the opened magnetic liquid (5) replenishing injection channel II, the magnetic liquid (5) replenishing injection channel III and the magnetic liquid (5) replenishing injection channel IV through the syringe (19). Under the action of the magnetic field, the magnetic liquid (5) replenishing injection is gathered at a plurality of pole teeth on the inner side surfaces of the right pole shoe (10), the middle pole shoe (12) and the left pole shoe (14), thereby re-forming a magnetic liquid dynamic seal.

5. A long-life nuclear radiation and dustproof magnetic liquid sealing device according to claims 1 and 2, characterized in that: The outer circumferential surface of the magnetic sleeve (4) is provided with three annular grooves, into which a retaining spring I (402), a retaining spring II (403) and a retaining spring III (404) are placed respectively; retaining spring I (402) provides axial positioning for the inner ring of the right bearing (8), retaining spring II (403) and retaining spring III (404) provide axial positioning for the inner ring of the left bearing (16), thereby 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 circumferential surface of the magnetic sleeve (4) is provided with two annular grooves, into which an inner rubber ring I (401) and an inner rubber ring II (405) are placed respectively; The right side of the magnetic sleeve (4) is provided with a shoulder at the position of the clamping hoop (3) assembly to provide axial positioning for the clamping hoop (3) assembly; the right end face of the magnetic sleeve (4) is provided with a plurality of grooves along the circumferential direction, the depth of the grooves being greater than the thickness of the clamping hoop (3) and less than the distance between the inner rubber ring I (401) and the right end face of the magnetic sleeve (4); the clamping hoop (3) is provided with a plurality of radial threaded holes along the circumferential direction, the threaded holes being staggered with the plurality of grooves at the right end of the magnetic sleeve (4), the set screw VI (301) being installed in the threaded hole to compress the magnetic sleeve (4) assembly to fix the long-life nuclear radiation and dustproof magnetic liquid sealing device on the rotating shaft of the nuclear energy equipment.

6. The long-life nuclear radiation and dustproof magnetic liquid sealing device according to claims 1-5, characterized in that: The permanent magnet I (6), permanent magnet II (11), permanent magnet III (13), and permanent magnet IV (18) are made of materials with good radiation resistance and high temperature resistance, such as samarium cobalt permanent magnets. The magnetic shaft sleeve (4), the right pole shoe (10), the middle pole shoe (12), and the left pole shoe (14) are made of magnetic conductive materials with good radiation resistance or high saturation magnetic induction intensity, such as cobalt steel, iron-cobalt-vanadium soft magnetic alloy, etc. The magnetic liquid (5) is a radiation-resistant magnetic liquid.

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