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CN-122014854-A - Combined sealing structure

CN122014854ACN 122014854 ACN122014854 ACN 122014854ACN-122014854-A

Abstract

The invention discloses a combined sealing structure which comprises a shell, a shaft sleeve, a static ring, a spring, a tooth-shaped sealing element, a spring piece, an electromagnetic coil, a ferromagnetic pole shoe and magnetic fluid, wherein the shaft sleeve is fixedly connected to a rotor in one side of the shell close to the atmosphere, the static ring is connected to the inner side surface of the shaft sleeve, the spring is arranged between the static ring and the left wall in the shell, the ferromagnetic pole shoe and the electromagnetic coil are arranged between the rotor and one side of the shell close to the equipment, the magnetic fluid is sealed between the ferromagnetic pole shoe and the rotor, the tooth-shaped sealing element is arranged between the middle of the shell and the rotor, and the tooth-shaped sealing element is fixed on the inner side of the shell through the spring piece. The combined sealing structure can protect the pole shoe under the condition of large radial movement of the rotor, and can keep the internal sealing of the equipment under the condition of power failure.

Inventors

  • ZHANG XUYANG
  • YAN YUXI
  • WU SHAOYI
  • ZHANG KUNYU

Assignees

  • 中国船舶集团有限公司第七〇四研究所

Dates

Publication Date
20260512
Application Date
20260104

Claims (10)

  1. 1. A combined sealing structure is characterized by comprising a shell, a shaft sleeve, a static ring, a spring, a tooth-shaped sealing element, a spring piece, an electromagnetic coil, a ferromagnetic pole shoe and magnetic fluid, wherein the shaft sleeve is fixedly connected to a rotor in one side of the shell close to the atmosphere, the static ring is connected to the inner side surface of the shaft sleeve, the spring is arranged between the static ring and the left wall in the shell, the ferromagnetic pole shoe and the electromagnetic coil are arranged between the rotor and one side of the shell close to the equipment, the magnetic fluid is sealed between the ferromagnetic pole shoe and the rotor, the tooth-shaped sealing element is arranged between the middle of the shell and the rotor, and the tooth-shaped sealing element is fixed on the inner side of the shell through the spring piece.
  2. 2. The seed combination type sealing structure of claim 1, wherein the shell adopts a split surface mounting structure.
  3. 3. The seed combination type sealing structure according to claim 1, wherein the shaft sleeve and the rotor are mutually fixed through rectangular keys.
  4. 4. A combined sealing structure according to claim 1, wherein a sealing ring is arranged between the shaft sleeve and the rotor to ensure the sealing of the position.
  5. 5. The seed combination type sealing structure of claim 1, wherein the end face of the shaft sleeve is provided with a dynamic pressure groove, and the shaft sleeve and the stationary ring are in sliding sealing fit through grinding and polishing treatment.
  6. 6. A seed combination seal as claimed in claim 1, wherein the tooth tip of the tooth seal is spaced from the rotor by a distance less than the distance between the ferromagnetic pole piece and the rotor.
  7. 7. A modular seal structure as set forth in claim 1 wherein a seal ring is mounted between the ferromagnetic pole piece and the housing to ensure sealing at that location.
  8. 8. The combination seal structure of claim 1, wherein the magnetic fluid seal utilizes an electromagnet to generate a strong magnetic field in a sealing gap between the rotor and the ferromagnetic pole piece, and the magnetized sealant is adsorbed to the tooth end of the ferromagnetic pole piece with the highest magnetic field intensity.
  9. 9. The seal structure according to claim 1, wherein the sleeve rotates with the rotor when the rotor rotates, a film is formed between the sleeve and the stationary ring, the spring is compressed, and when the rotor is stationary, the film disappears, and the sleeve and the stationary ring are tightly connected to ensure the seal in the stationary state.
  10. 10. The seed combination type sealing structure of claim 1, wherein when the radial play of the rotor is large, the tooth-shaped sealing element is firstly contacted with the rotor, the rotor pushes the tooth-shaped sealing element to move inwards, and then the rotor returns to the original position under the action of the force of the spring piece, so that the ferromagnetism is ensured not to collide with the rotor.

Description

Combined sealing structure Technical Field The invention belongs to the technical field of sealing of rotating shaft structures, and particularly relates to a combined sealing structure. Background The structure of the prior magnetic fluid sealing technology is shown in figure 1. The traditional magnetic fluid sealing structure consists of a shell 21, a sealing ring 22, an electromagnetic coil 23, a ferromagnetic pole shoe 24, a front baffle 25, magnetic fluid 26 and the like. In fig. 1, the left side of the magnetic fluid sealing structure is the atmosphere, and the right side is the sealing medium. In practical use, electromagnetic coils are often used instead of permanent magnets. Because the electromagnetic coil has dynamic adjustable performance, the magnetic field strength can be accurately adjusted by adjusting the current when the pressure of the internal sealing medium changes, and thus the pressure bearing capacity of the magnetic fluid seal is changed. But it also has the problem that the solenoid fails immediately after power failure, resulting in a seal failure. The energized state of the solenoid must therefore be ensured at all times during the shutdown of the device. Meanwhile, under the condition of larger axial channeling amount of the rotor, the pole shoe is easy to rub against the rotor of the equipment, so that the pole shoe is damaged (such as the low-temperature large-diameter magnetic liquid sealing device disclosed in patent CN 1544834A), and further the magnetic fluid sealing structure is damaged and replaced. Although the method of increasing dynamic and static gaps, widening the sealing surface of the pole shoe and the like improves the problem in practical use, the problem of reducing the sealing pressure is caused. Disclosure of Invention In order to solve the problems in the prior art, the invention provides a combined sealing structure which can protect a pole shoe under the condition of large radial play of a rotor and keep the inside of equipment sealed under the condition of power failure. The combined sealing structure comprises a shell, a shaft sleeve, a static ring, a spring, a tooth-shaped sealing piece, a spring piece, an electromagnetic coil, a ferromagnetic pole shoe and magnetic fluid, wherein the shaft sleeve is fixedly connected to a rotor in the side, close to the atmosphere, of the shell, the static ring is connected to the inner side surface of the shaft sleeve, the spring is arranged between the static ring and the left wall in the shell, the ferromagnetic pole shoe and the electromagnetic coil are arranged between the inner side, close to the equipment, of the shell and the rotor, the magnetic fluid seal is arranged between the ferromagnetic pole shoe and the rotor, the tooth-shaped sealing piece is arranged between the middle of the shell and the rotor, and the tooth-shaped sealing piece is fixed on the inner side of the shell through the spring piece. Further, the shell adopts a split surface mounting structure. Further, the shaft sleeve is fixed with the rotor through a rectangular key. Further, a sealing ring is installed between the shaft sleeve and the rotor to ensure sealing of the position. Further, the end face of the shaft sleeve is provided with a dynamic pressure groove, and the shaft sleeve and the stationary ring are in sliding sealing fit through grinding and polishing treatment. Further, the distance between the tooth tip of the tooth seal and the rotor is less than the distance between the ferromagnetic pole piece and the rotor. Further, a sealing ring is installed between the ferromagnetic pole piece and the shell to ensure that the position is sealed. Further, the magnetic fluid seal utilizes the sealing gap between the rotor and the ferromagnetic pole shoe by the electromagnet to generate a strong magnetic field, and the magnetized sealant is adsorbed to the tooth end of the ferromagnetic pole shoe with the highest magnetic field intensity. When the rotor is static, the air film disappears, the shaft sleeve is tightly connected with the static ring, and the sealing in the static state is ensured. Further, when the radial play of the rotor is large, the tooth-shaped sealing element is firstly contacted with the rotor, the rotor pushes the tooth-shaped sealing element to move inwards, and then the rotor returns to the original position under the action of the force of the spring piece, so that the ferromagnetism is ensured not to collide with the rotor. Compared with the prior art, the invention has the following remarkable beneficial effects: When the rotor rotates, the shaft sleeve rotates along with the rotor, a layer of air film is formed between the shaft sleeve and the stationary ring, and the spring is compressed. After the rotor is static, the air film disappears, and the dynamic ring and the static ring are tightly connected, so that the sealing of the structure in a static state is ensured. When the radial play of the rotor is lar