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CN-120042922-B - Long-life nuclear radiation prevention dustproof magnetic liquid sealing device

CN120042922BCN 120042922 BCN120042922 BCN 120042922BCN-120042922-B

Abstract

The invention relates to a long-life nuclear radiation-proof dustproof magnetic liquid sealing device, and belongs to the technical field of mechanical engineering sealing. The device comprises a shell component, a threaded end cover, a clamping hoop component, a magnetic conduction shaft sleeve component, magnetic liquid, four permanent magnets, four magnetism isolating rings, a right bearing, a right pole shoe component, a middle pole shoe component, a left bearing and a syringe. When the original magnetic liquid is lost, the set screw on the shell is taken out, the magnetic liquid is injected from the opened magnetic liquid supplementing injection channel through the injector, and under the action of a magnetic field, the injected magnetic liquid reforms the magnetic liquid seal, so that the overhaul operation complexity is reduced, and the pressure endurance capability of the device is ensured.

Inventors

  • LI DECAI
  • LIU SIJIA
  • HE XINZHI

Assignees

  • 北京交通大学
  • 清华大学

Dates

Publication Date
20260512
Application Date
20250117

Claims (5)

  1. 1. A long-life nuclear radiation-proof dustproof magnetic liquid sealing device is characterized by 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 cover (2), a clamping hoop (3), a set screw VI (301), a magnetic conduction shaft sleeve (4), an inner rubber ring I (401), a clamp spring I (402), a clamp spring II (403), a clamp spring III (404), an inner rubber ring II (405), magnetic liquid (5), a permanent magnet I (6), a magnetism isolation ring I (7), a right bearing (8), a magnetism isolation ring II (9), a right pole shoe (10), a pole shoe rubber ring I (1001), a pole shoe II (1002), a pole shoe II (11), a middle pole shoe (12), a rubber ring III (1201), a rubber ring IV (1202), a permanent magnet ring III (13), a left pole shoe V (14), a magnetism isolation ring VI (16), a magnetism isolation bearing (1402) and a magnetism ring III (16) A magnetism isolating ring IV (17), a permanent magnet IV (18) and an injector (19); The device comprises the connection among the parts, wherein the shell (1), the outer rubber ring I (101), the set screw I (102), the outer rubber ring II (103), the set screw II (107), 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) form a shell component, the clamping hoop (3), the set screw VI (301) form a clamping hoop component, the magnetic conduction shaft sleeve (4), the inner rubber ring I (401), the clamp spring I (402), the clamp spring II (403), the clamp spring III (404) and the inner rubber ring II (405) form a magnetic conduction shaft sleeve component, the right pole shoe (10), the pole shoe rubber ring I (1001) and the pole shoe rubber ring II (1002) form a right pole shoe component, the middle pole shoe component (12), the rubber ring III (1201), the rubber ring IV (1202) form a middle pole shoe component, the left pole shoe component V (1402) and the left rubber ring VI (1402) form a magnetic ring component, the magnetic ring IV (18), the permanent magnet ring (16) and the permanent magnet ring (13) form a magnetic isolation ring (13) and a permanent magnet assembly (13) The right pole shoe assembly, the magnetism isolating ring II (9), the right bearing (8), the magnetism isolating ring I (7) and the permanent magnet I (6) are sequentially arranged on the magnetism conducting shaft sleeve assembly from left to right and then are arranged in the shell assembly, the shell assembly is connected with the screw thread end cover (2) through screw threads, the clamping hoop (3) is connected with the magnetism conducting shaft sleeve assembly through a set screw VI (301), and the whole sealing device is fixed on a nuclear energy equipment rotating shaft; The magnetic isolation ring IV (17) is provided with a radial through hole, the shell (1) is provided with a radial threaded hole at the corresponding position of the magnetic isolation ring IV (17) through hole, the threaded hole is concentric with the through hole, the set screw I (102) is arranged in the threaded hole to form a closed magnetic liquid supplementing injection channel I, the left pole shoe (14) is provided with a radial through hole, the shell (1) is provided with a radial threaded hole at the corresponding position of the left pole shoe (14) through hole, the threaded hole is concentric with the through hole, the set screw II (104) is arranged in the threaded hole to form a closed magnetic liquid supplementing injection channel II, the middle pole shoe (12) is provided with a radial through hole, the shell (1) is provided with a radial threaded hole at the corresponding position of the middle pole shoe (12) through hole, the threaded hole is concentric with the through hole to form a closed magnetic liquid supplementing injection channel III, the right pole shoe (10) is provided with a radial through hole, the shell (1) is provided with a radial threaded hole to form a magnetic liquid supplementing injection channel I, the shell (1) is concentric with the radial threaded hole (7) through hole to form a magnetic isolation ring IV through hole (7), the device comprises a shell (1), wherein a shell (1) is provided with a shell body, a screw hole is formed in the shell body, a closed magnetic liquid supplementing injection channel V is formed in the screw hole, an annular groove is formed in the right side of the screw hole, the left side of the screw hole I (102), the position between the screw hole I (102) and the screw hole II (104), the position between the screw hole II (104) and the screw hole III (106), the position between the screw hole III (106) and the screw hole IV (108), the position between the screw hole IV (108) and the screw hole V (110), and the right side of the screw hole 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 arranged in the corresponding grooves, and an annular boss is arranged on the outer side of the left end face of the shell body (1) and used for positioning connection of the anti-nuclear radiation dustproof magnetic liquid sealing device and nuclear energy equipment.
  2. 2. The long life nuclear radiation resistant dust resistant magnetic liquid seal of claim 1 wherein: 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 a threaded end cover (2) and a magnetism isolating ring I (7), an annular boss is arranged on the left end face of the threaded end cover (2) and is used for providing axial positioning for the permanent magnet I (6), an annular boss with the diameter of the inner circle surface being the same as that of the outer circle surface of the permanent magnet I (6) is arranged on the right end face of the magnetism isolating ring I (7) and is used for providing radial positioning for the permanent magnet I (6), the permanent magnet IV (18) is located between the left end face of a shell (1) and the magnetism isolating ring IV (17), an annular boss is arranged on the inner side of the left end face of the shell (1) and is used for providing axial positioning for the permanent magnet IV (18), and an annular boss with the diameter of the inner circle surface being the same as that of the permanent magnet IV (18) is arranged on the left end face of the magnetism isolating ring IV (17) and is used for providing radial positioning for the permanent magnet IV (18); Gaps exist between the outer circular surfaces of the permanent magnets I (6) and IV (18) and the corresponding positions of the inner circular surfaces of the shell (1), gaps exist between the inner circular surfaces of the permanent magnets I (6) and IV (18) and the corresponding positions of the outer circular surfaces of the magnetic conduction shaft sleeve (4), magnetic liquid (5) is injected into the gaps, and due to the tip effect, the magnetic liquid (5) is gathered at the left and right tip circular rings of the outer circular surfaces of the permanent magnets I (6) and IV (18) and the left and right tip circular rings of the inner circular surfaces under the action of a magnetic field to form static and dynamic sealing of the magnetic liquid; When the device runs for a long time in a nuclear radiation environment, due to the influence of nuclear radiation and high temperature, the original magnetic liquid (5) is lost, the set screw I (102) and the set screw V (110) are taken out, the magnetic liquid (5) is injected from the opened magnetic liquid supplementary injection channel I and the magnetic liquid supplementary injection channel V through the injector (19), under the action of a magnetic field, the supplementary injected magnetic liquid (5) is gathered at the left and right tip circular rings of the outer circular surfaces and the left and right tip circular rings of the inner circular surfaces of the permanent magnet I (6) and the permanent magnet IV (18), and static and dynamic sealing of the magnetic liquid is reconstructed.
  3. 3. A long life nuclear radiation protected dust protected magnetic fluid seal as defined in claim 1 or 2 wherein: the permanent magnet II (11) and the permanent magnet III (13) are axial magnetizing annular permanent magnets with opposite magnetizing directions, the permanent magnet II (11) is positioned between the right pole shoe (10) and the middle pole shoe (12), an annular boss with the diameter of the outer circle surface being the same as that of the inner circle surface of the permanent magnet II (11) is arranged on the left side surface of the right pole shoe (10), an annular boss with the diameter of the outer circle surface being the same as that of the inner circle surface of the permanent magnet II (11) is arranged on the right side surface of the middle pole shoe (12), radial and axial positioning is provided for the permanent magnet II (11), the permanent magnet III (13) is positioned between the middle pole shoe (12) and the left pole shoe (14), an annular boss with the diameter of the outer circle surface being the same as that of the inner circle surface of the permanent magnet III (13) is arranged on the left side surface of the left pole shoe (14), and radial and axial positioning is provided for the permanent magnet III (13); Two sides of the radial through hole of the right pole shoe (10) are respectively provided with an annular groove, and the pole shoe rubber ring I (1001) and the pole shoe rubber ring II (1002) are arranged in the corresponding grooves; the magnetic liquid dynamic seal is formed by injecting magnetic liquid (5) into the gap between the inner side surfaces of the right pole shoe (10), the middle pole shoe (12) and the left pole shoe (14) and between the inner side surfaces of the magnetic conductive shaft sleeve (4) and the corresponding positions of the outer surfaces of the magnetic conductive shaft sleeve and the magnetic liquid, wherein the magnetic liquid is filled in the gap; When the device runs for a long time in a nuclear radiation environment, due to the influence of nuclear radiation and high temperature, when the original magnetic liquid (5) has certain loss, the set screw II (104), the set screw III (106) and the set screw IV (108) are taken out, the magnetic liquid (5) is injected from the opened magnetic liquid supplementary injection channel II, the magnetic liquid supplementary injection channel III and the magnetic liquid supplementary injection channel IV through the injector (19), and under the action of a magnetic field, the supplementary injected 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), so that the magnetic liquid dynamic seal is reconfigured.
  4. 4. A long life nuclear radiation resistant dust resistant magnetic liquid seal according to any one of claims 1 or 2 wherein: The magnetic conduction shaft sleeve (4) is provided with three annular grooves on the outer circle surface, a clamp spring I (402), a clamp spring II (403) and a clamp spring III (404) are respectively arranged in the annular grooves, the clamp spring I (402) provides axial positioning for the inner circle of a right bearing (8), the clamp spring II (403) and the clamp spring III (404) provide axial positioning for the inner circle of a left bearing (16), the right bearing (8) is guaranteed to be a floating end, the left bearing (16) is guaranteed to be a fixed end, the magnetic isolation ring I (7) is arranged between the right bearing (8) and a right pole shoe (10), the magnetic isolation ring II (9) provides axial positioning for the outer circle of the right bearing (8) together, the magnetic isolation ring III (15) is arranged between the left pole shoe (14) and the left bearing (16) together with a magnetic isolation ring IV (17) provides axial positioning for the outer circle of the left bearing (16), and the inner circle surface of the magnetic conduction shaft sleeve (4) is provided with two annular grooves, and the inner rubber ring I (401) and the inner rubber ring II (405) are respectively arranged in the annular grooves; The right side of the magnetic conduction shaft sleeve (4) is provided with a shaft shoulder at the position of the clamping hoop assembly for providing axial positioning for the clamping hoop assembly, the right end face of the magnetic conduction shaft sleeve (4) is provided with a plurality of grooves along the circumferential direction, the depth of the grooves is larger than the distance between the thickness of the clamping hoop (3) and the right end face of the magnetic conduction shaft sleeve (4), the thickness of the clamping hoop (3) is smaller than the distance between the inner rubber ring I (401) and the right end face of the magnetic conduction shaft sleeve (4), the circumferential direction of the clamping hoop (3) is provided with a plurality of radial threaded holes, the threaded holes are staggered with the grooves at the right end of the magnetic conduction shaft sleeve (4), the set screw VI (301) is arranged in the threaded holes for compressing the magnetic conduction shaft sleeve assembly, and the long-service-life nuclear radiation-prevention dustproof magnetic liquid sealing device is fixed on a nuclear energy equipment rotating shaft.
  5. 5. A long life nuclear radiation resistant dust resistant magnetic liquid seal according to any one of claims 1 or 2 wherein: The permanent magnet I (6), the permanent magnet II (11), the permanent magnet III (13) and the permanent magnet IV (18) are made of materials with good radiation resistance and high temperature resistance; The magnetic conduction shaft sleeve (4), the right pole shoe (10), the middle pole shoe (12) and the left pole shoe (14) are made of magnetic conduction materials with good radiation resistance or high saturation induction intensity; the magnetic liquid (5) is radiation-resistant magnetic liquid.

Description

Long-life nuclear radiation prevention dustproof magnetic liquid sealing device Technical Field The invention belongs to the technical field of nuclear energy, and particularly relates to a long-life nuclear radiation-proof dustproof magnetic liquid sealing device. Background In the nuclear energy field, when a plurality of nuclear power equipment of a nuclear reactor operates, the nuclear power equipment is not only exposed to a plurality of high-energy ray environments to be subjected to nuclear radiation, but also various radioactive powder materials exist due to different working mediums, and the radioactive powder materials have great influence on each part of the nuclear power equipment. For example, nuclear radiation can destroy traditional sealed parts, thereby affecting the pressure-resistant effect and the service life of the seal, and radioactive dust enters the bearing to increase the running moment, and equipment is blocked when serious. Meanwhile, due to the specificity of the radiation environment of the nuclear power equipment, long-time stable operation is required to be ensured, and the times, steps and time length of maintenance and repair are reduced as much as possible. Under the special conditions, a magnetic liquid sealing device which can run for a long time, prevent nuclear radiation and prevent dust needs to be provided. Disclosure of Invention The invention provides a magnetic liquid sealing device which is arranged on a rotating shaft of nuclear power equipment, has good radiation protection performance and strong pressure resistance and can run in a radioactive powder environment for a long time. The purpose is to prevent the destruction of nuclear radiation to each spare part in the magnetic liquid sealing device, prevent that radioactive powder from getting into the inside equipment card that causes of magnetic liquid seal, improve sealing device pressure-resistant ability, through design magnetic liquid replenishment injection channel, reduce the operational complexity, realize under the condition of not taking apart the sealed inner structure of magnetic liquid, quick replacement is magnetic liquid on the inside, guarantees sealing device's long-time operational reliability. The technical scheme includes that the long-life nuclear radiation-resistant dustproof magnetic liquid sealing device 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 (8), 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 conduction shaft sleeve (4), an inner rubber ring I (401), a clamp spring I (402), a clamp spring II (403), a clamp spring III (404), an inner rubber ring II (405), a magnetic liquid (5), a permanent magnet I (6), a magnetic isolation ring I (7), a right bearing (8), a magnetic isolation ring II (9), a right pole shoe (10), a pole shoe I (1001), a pole shoe II (1002), a permanent magnet II (11), a middle pole shoe (12), a rubber ring III (1201), a rubber ring IV (1202), a rubber ring III (13), a magnetic isolation ring VI (14) and a magnetic pole shoe III (15) The device comprises a left bearing (16), a magnetism isolating ring IV (17), a permanent magnet IV (18) and an injector (19). The device comprises the connection among the parts, wherein the shell (1), the outer rubber ring I (101), the set screw I (102), the outer rubber ring II (103), the set screw II (107), 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) form a shell (1) component, the clamping hoop (3), the set screw VI (301) form a clamping hoop (3) component, the magnetic conduction shaft sleeve (4), the inner rubber ring I (401), the clamp spring I (402), the clamp spring II (403), the clamp spring III (404) and the inner rubber ring II (405) form a magnetic conduction shaft sleeve (4) component, the right pole shoe (10), the rubber ring I (1001) and the pole shoe rubber ring II (1002) form a right pole shoe (10) component, the middle pole shoe (12), the pole shoe III (1201), the rubber ring IV (1202) form a middle pole shoe (12) component, the left pole shoe (14), the rubber ring VI (14), the left pole shoe IV (1402) form a magnetic ring (16) and a permanent magnet ring (16) bearing (16) The magnetic isolation ring III (15), the left pole shoe (14) component, the permanent magnet III (13), the middle pole shoe (12) component, the permanent magnet II (11), the right pole shoe (10) component, the magnetic isolation ring II (9), the right bearing (8), the magnetic isolation ring I (7) and the permanent magnet I (6) are sequentially arranged on the magnetic conduction shaft sleeve (4) comp