CN-117212463-B - Anti-radiation magnetic liquid sealing device with magnetic liquid storage and supplementing functions

CN117212463BCN 117212463 BCN117212463 BCN 117212463BCN-117212463-B

Abstract

The invention relates to a radiation-resistant magnetic liquid sealing device with a magnetic liquid storage and supplement function, belonging to the technical field of mechanical engineering sealing. The device comprises a rotating shaft, a shell, a clamp spring I, a left bearing, a clamp spring II, a left magnetism isolating sleeve, a stator iron core I, a winding coil I, a left pole shoe, magnetic liquid, a permanent magnet, a right pole shoe, a stator iron core II, a winding coil II, an outer magnetism isolating sleeve, an inner magnetism isolating sleeve, a right bearing, an end cover, a clamp spring III, a Peltier III, a magnetic liquid storage bin II, a right sealing ring, peltier II, a radiation resistant shaft sleeve, a left sealing ring, a magnetic liquid storage bin I and Peltier I. Under the special occasion of nuclear radiation, the radiation-resistant shaft sleeve is used for providing radiation protection for the permanent magnet, the Peltier is used for cooling the permanent magnet and the electromagnet assembly, so that the magnetization performance of the permanent magnet is guaranteed, the magnetic liquid is adsorbed to the pole teeth from the magnetic liquid storage bin for supplementing by utilizing the magnetic field gradient, the sealing performance of the magnetic liquid sealing device is finally guaranteed, and the reliability of the magnetic liquid sealing device is improved.

Inventors

LIU SIJIA
LI DECAI
WANG ZHIBIN
HE XINZHI
LIU JIAWEI
CAI JINGCHENG

Assignees

北京交通大学
清华大学

Dates

Publication Date: 20260512
Application Date: 20230927

Claims (7)

1. The anti-radiation magnetic liquid sealing device with the magnetic liquid storage and supplement functions is characterized by comprising a rotating shaft (1), a shell (2), a clamp spring I (3), a left bearing (4), a clamp spring II (5), a left magnetism isolating sleeve (6), a stator iron core I (7), a winding coil I (8), a left pole shoe (9), magnetic liquid (10), a permanent magnet (11), a right pole shoe (12), a stator iron core II (13), a winding coil II (14), an outer magnetism isolating sleeve (15), an inner magnetism isolating sleeve (16), a right bearing (17), an end cover (18), a clamp spring III (19), a Peltier III (20), a magnetic liquid storage bin II (21), a right sealing ring (22), peltier II (23), an anti-radiation shaft sleeve (24), a left sealing ring (25), a magnetic liquid storage bin I (26) and Peltier I (27); The device comprises the connection of the parts, wherein the right side surface of a left magnetism isolating sleeve (6), the outer side surface of a permanent magnet (11) and the left side surface of an outer magnetism isolating sleeve (15) are correspondingly and uniformly provided with a plurality of Peltier I (27), peltier II (23) and Peltier III (20), the left magnetism isolating sleeve (6) with the Peltier I (27), the permanent magnet (11) with the Peltier II (23) and the outer magnetism isolating sleeve (15) with the Peltier III (20) are formed, a winding coil I (8) is wound on a stator iron core I (7) to form an electromagnet assembly I, a winding coil II (14) is wound on a stator iron core II (13) to form an electromagnet assembly II, annular grooves are respectively arranged on the outer circular surfaces of a left pole shoe (9) and a right pole shoe (12), the left sealing ring (25) and the right sealing ring (22) are respectively arranged in the corresponding grooves to form a left pole shoe (9) with the left sealing ring (25), a right pole shoe (12) with the right sealing ring (22), an anti-radiation sleeve (24) is arranged between the left pole shoe (9) and the right pole shoe (12) and the left pole shoe (9) and the left pole shoe (3) and the left pole shoe (25) are provided with the electromagnet assembly I and the left pole shoe (3) and the left pole shoe (9) and the left pole shoe (7) and the left sealing ring assembly II (7) and the electromagnet assembly The permanent magnet (11) with the Peltier II (23), the radiation-resistant shaft sleeve (24), the right pole shoe (12) with the right sealing ring (22), the electromagnet assembly II, the outer magnetism isolating sleeve (15) with the Peltier III (20), the inner magnetism isolating sleeve (16), the right bearing (17) and the clamp spring III (19) are sequentially arranged on the rotating shaft (1) from left to right and then are arranged in the shell (2), and the end cover (18) is connected with the shell (2) by adopting screws; When the magnetic liquid storage bin I (26) and the magnetic liquid storage bin II (21) are in normal operation, the magnetic fields of the electromagnet assembly I and the electromagnet assembly II are strong, the magnetic liquid in the magnetic liquid storage bin I (26) and the magnetic liquid storage bin II (21) is adsorbed, after the performance of the magnetic liquid (10) at the pole teeth is damaged and lost by radiation, the magnetic fields of the electromagnet assembly I and the electromagnet assembly II are regulated down, at the moment, the magnetic field of the permanent magnet (11) is strong, and the magnetic liquid in the magnetic liquid storage bin I (26) and the magnetic liquid storage bin II (21) is adsorbed to the lower pole teeth of the left pole shoe (9) and the right pole shoe (12) for supplementation by utilizing the magnetic field gradient.
2. The radiation resistant magnetic liquid seal with magnetic liquid storage and replenishment as defined in claim 1 wherein: The radiation-resistant shaft sleeve (24) is made of radiation-resistant materials, and the width of the radiation-resistant shaft sleeve is the same as that of the permanent magnet (11).
3. The radiation resistant magnetic liquid seal with magnetic liquid storage and replenishment as defined in claim 1 wherein: The magnetic liquid sealing device comprises a left pole shoe (9), a right pole shoe (12), a permanent magnet (11), a cooling surface punching permanent magnet (11) and a radiation-resistant shaft sleeve (24), wherein limit bosses are arranged on the right side of the left pole shoe (9) and the left side of the right pole shoe (12), the permanent magnet (11) is located between the left pole shoe (9) and the right pole shoe (12), the permanent magnet (11) is made of a material with good radiation resistance and good high temperature resistance, the permanent magnet (11) is an axially magnetized permanent magnet, the cross section is polygonal with a round hole in the center, the longest diagonal length of the cross section of the permanent magnet (11) is smaller than the diameter of the inner circular surface of the radiation-resistant shaft sleeve (24), the diameter of the central through hole of the permanent magnet (11) is the same as the diameter of the outer circular surface of the limit boss on the right side of the left pole shoe (9) and the left side of the right pole shoe (12), the cooling surface punching permanent magnet (11) is uniformly arranged on the outer side of the permanent magnet (11), a plurality of cooling surface punching permanent magnets (11), and gaps of the cooling surface punching permanent magnet (11) and the radiation-resistant shaft sleeve (24) are formed, and when the magnetic liquid sealing device causes local temperature rise due to radiation, the cooling performance is guaranteed by using the permanent magnet (11).
4. The radiation resistant magnetic liquid seal with magnetic liquid storage and replenishment as defined in claim 1 wherein: The rotary shaft (1) is provided with a circular table type shaft shoulder at the corresponding position of the circular table part of the right pole shoe (12), the larger bottom surface of the circular table is towards the right side, the circular table part of the rotary shaft (1) is parallel to the generatrix of the circular table part of the right pole shoe (12), the rotary shaft (1) is provided with a plurality of pole teeth at the corresponding positions of the left pole shoe (9) and the right pole shoe (12), a gap exists between the pole teeth arranged on the rotary shaft (1) and the inner circular surfaces of the left pole shoe (9) and the right pole shoe (12), and magnetic liquid (10) is injected at the gap to form magnetic liquid seal.
5. The radiation resistant magnetic liquid seal with magnetic liquid storage and replenishment as defined in claim 4 wherein: The rotary shaft (1) is provided with a circular shaft shoulder at a position corresponding to the electromagnet assembly II, and the diameter of the outer circular surface of the circular shaft shoulder is the same as the diameter of the larger bottom surface of the circular table type shaft shoulder of the rotary shaft (1); the right pole shoe (12) is provided with a round table part, so that a certain height difference exists between the pole teeth and the magnetic liquid storage bin II (21), and the magnetic liquid (10) can be conveniently supplemented.
6. The radiation resistant magnetic liquid seal with magnetic liquid storage and replenishment as defined in claim 1 wherein: The Peltier I (27) is uniformly arranged on the right side surface of the left magnetism isolating sleeve (6), a plurality of gaps are reserved between the left magnetism isolating sleeve (6) and the electromagnet assembly I, the left magnetism isolating sleeve (6) is punched by a cooling surface, the left magnetism isolating sleeve (6) is punched by a heat radiating surface, and the temperature of the electromagnet assembly I is reduced by using the Peltier I (27), so that the smooth running of the Peltier I is ensured; The outer magnetic isolation sleeve (15) is positioned between the electromagnet assembly II and the right bearing (17), the Peltier III (20) is uniformly arranged on the left side surface of the outer magnetic isolation sleeve (15), a plurality of gaps are reserved between the outer magnetic isolation sleeve (15) and the electromagnet assembly II for refrigerating surfaces, the outer magnetic isolation sleeve (15) is punched on radiating surfaces, the temperature of the electromagnet assembly II is reduced by the Peltier III (20), the smooth running of the electromagnet assembly II is guaranteed, the inner magnetic isolation sleeve (16) is of an inverted T-shaped structure and is positioned between the circular shaft shoulder of the rotating shaft (1) and the right bearing (17), and the outer magnetic isolation sleeve (15) and the inner magnetic isolation sleeve (16) are matched and installed to form a small-section labyrinth seal.
7. The radiation-resistant magnetic liquid sealing device with magnetic liquid storage and replenishment function according to any one of claims 1, 4 and 5, wherein: The rotating shaft (1), the left pole shoe (9) and the right pole shoe (12) are made of magnetic conductive materials with good radiation resistance; The shell (2) is made of a non-magnetic radiation-resistant material; The magnetic liquid (10) is radiation-resistant magnetic liquid.

Description

Anti-radiation magnetic liquid sealing device with magnetic liquid storage and supplementing functions Technical Field The invention belongs to the technical field of mechanical engineering sealing, and particularly relates to an anti-radiation magnetic liquid sealing device with a magnetic liquid storage and supplement function. Background Sealing is an important technical means for preventing leakage of sealed media from adjacent joint surfaces and preventing external impurities from entering the machine equipment. The magnetic liquid seal is a non-contact seal, and is widely applied to industrial equipment due to the advantages of zero leakage, no pollution, long service life and the like. In the nuclear energy field, when many devices are operated, the safety protection of nuclear radiation is necessary, and the sealing part has higher radiation resistance requirement. In these special occasions, long-time radiation can cause local temperature rise of the magnetic liquid sealing device, reduce magnetization performance of the permanent magnet, and simultaneously, the radiation can change performance parameters of the magnetic liquid, so that reliability of the magnetic liquid sealing device is finally affected. Therefore, it is necessary to provide a radiation-resistant magnetic liquid sealing device with the functions of magnetic liquid storage and supplement, which can reduce the local temperature. Disclosure of Invention The invention provides a radiation-resistant magnetic liquid sealing device with good radiation protection performance, reduced local temperature and magnetic liquid storage and supplement functions, and aims to solve the problem that a series of influences and damages of nuclear radiation environment on the magnetic liquid sealing device are overcome, and the reliability of the sealing device is ensured. The anti-radiation magnetic liquid sealing device with the magnetic liquid storage and supplement functions comprises a rotating shaft (1), a shell (2), a clamp spring I (3), a left bearing (4), a clamp spring II (5), a left magnetism isolating sleeve (6), a stator iron core I (7), a winding coil I (8), a left pole shoe (9), magnetic liquid (10), a permanent magnet (11), a right pole shoe (12), a stator iron core II (13), a winding coil II (14), an outer magnetism isolating sleeve (15), an inner magnetism isolating sleeve (16), a right bearing (17), an end cover (18), a clamp spring III (19), a Peltier III (20), a magnetic liquid storage bin II (21), a right sealing ring (22), a Peltier II (23), an anti-radiation shaft sleeve (24), a left sealing ring (25), a magnetic liquid storage bin I (26) and a Peltier I (27). The device comprises the connection of the parts, wherein the right side surface of a left magnetism isolating sleeve (6), the outer side surface of a permanent magnet (11) and the left side surface of an outer magnetism isolating sleeve (15) are correspondingly and uniformly provided with a plurality of Peltier I (27), peltier II (23) and Peltier III (20), the left magnetism isolating sleeve (6) with the Peltier I (27), the permanent magnet (11) with the Peltier II (23) and the outer magnetism isolating sleeve (15) with the Peltier III (20) are formed, a winding coil I (8) is wound on a stator iron core I (7) to form an electromagnet assembly I, a winding coil II (14) is wound on a stator iron core II (13) to form an electromagnet assembly II, annular grooves are respectively arranged on the outer circular surfaces of a left pole shoe (9) and a right pole shoe (12), the left sealing ring (25) and the right sealing ring (22) are respectively arranged in the corresponding grooves to form a left pole shoe (9) with the left sealing ring (25), a right pole shoe (12) with the right sealing ring (22), and the left bearing (3), the left bearing (4), the left bearing (5), the left pole shoe (27) with the left pole shoe (24) and the permanent magnet assembly (11) with the Peltier II (24) are formed The right pole shoe (12) with the right sealing ring (22), the electromagnet assembly II, the outer magnetism isolating sleeve (15) with the Peltier III (20), the inner magnetism isolating sleeve (16), the right bearing (17) and the clamp spring III (19) are sequentially arranged on the rotating shaft (1) from left to right and then are arranged in the shell (2), and the end cover (18) is connected with the shell (2) through screws. Limiting bosses are arranged on the right side of the left pole shoe (9) and the left side of the right pole shoe (12) and provide axial positioning and radial positioning for the permanent magnet (11), and the permanent magnet (11) is positioned between the left pole shoe (9) and the right pole shoe (12), wherein the width of the anti-radiation shaft sleeve (24) is the same as that of the permanent magnet (11), and is also positioned between the left pole shoe (9) and the right pole shoe (12); The permanent magnet (11) is an axial magnetizing type permanent