Magnetic liquid sealing device with controllable sealing clearance

A technology of sealing gap and sealing device, which is applied in the direction of engine sealing, engine components, mechanical equipment, etc., can solve the problems of easy collision and wear, shaft stuck, and reduce the pressure resistance of the sealing device, so as to achieve strong operability, Improved sealing performance and high precision

Inactive Publication Date: 2018-03-16
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that under the conditions of large diameter and large temperature difference in the existing magnetic liquid rotary sealing device, the sealing gap increases or decreases due to the thermal expansion an

Method used

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  • Magnetic liquid sealing device with controllable sealing clearance
  • Magnetic liquid sealing device with controllable sealing clearance
  • Magnetic liquid sealing device with controllable sealing clearance

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Example Embodiment

[0015] The present invention will be further explained by taking the drawings as the specific embodiments:

[0016] Controllable sealing gap magnetic liquid sealing device such as figure 1 :Shell 1, spring base 2, spring 3, first pole shoe 4, first pole shoe seal ring 5, permanent magnet 6, second pole shoe 7, second pole shoe seal ring 8, end cap 9, magnetic liquid 10 , Shaft sleeve 11, shaft sleeve sealing ring 12, and rotary shaft 13.

[0017] The connection between the various parts of the device: the first pole shoe sealing ring 5 is installed in the groove of the outer circle of the first pole shoe 4 to form a first pole shoe with a sealing ring; the second pole shoe sealing The ring 8 is installed in the groove of the outer circle of the second pole piece 7 to form a second pole piece with a sealing ring; the sleeve sealing ring 12 is installed in the groove of the inner circle of the sleeve 11 to form a shaft with a sealing ring The sleeve; the sleeve with a sealing ring ...

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Abstract

A liquid sealing device with a controllable sealing gap belongs to the field of mechanical engineering sealing. It solves the problem that the existing magnetic liquid sealing device has a large diameter and a large temperature difference, and the sealing gap changes due to the thermal expansion and contraction characteristics of the material, which seriously affects the performance of the sealing device. The device is composed of a magnetic liquid sealing assembly, a spring (3), a spring base (2) and the like. The inner surface of the pole piece is parallel to the outer surface of the truncated portion of the shaft sleeve (11) and intersects with the axis of the rotary shaft (13). There is an axial clearance H between the end cover (9) and the housing (1): tighten the screws on the end cover (9), the axial clearance H becomes smaller, and the pole piece and the permanent magnet (6) are aligned axially as a whole. Move to the left, the sealing gap becomes smaller; when the screw on the end cover (9) is loosened, the axial distance H becomes larger, and the pole piece and the permanent magnet (6) move along the axial direction as a whole under the elastic force of the spring (3). Moving to the right, the seal gap becomes larger. Adjust the screw on the end cover (9) to adjust the size of the sealing gap.

Description

technical field [0001] The invention belongs to the field of mechanical engineering seals, and is especially suitable for magnetic liquid seals under the working conditions of large diameter and large temperature difference. Background technique [0002] Magnetic liquid seals are widely used due to their advantages of zero leakage, long life, and low friction. However, in practical applications, under the condition of large diameter and large temperature difference, the sealing gap of the magnetic liquid seal will increase or decrease due to the thermal expansion and contraction characteristics of the material. If the sealing gap is too large, the pressure resistance of the sealing device will be reduced. If it is too small, it is easy to cause friction and even "stuck" the shaft, which seriously affects the performance of the sealing device. For example, the linear expansion coefficient of steel in engineering is generally taken as 1.2×10 -5 mm / mm·℃, if the diameter of th...

Claims

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Application Information

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IPC IPC(8): F16J15/43
CPCF16J15/43
Inventor 李德才喻峻李文怡戴荣坤
Owner BEIJING JIAOTONG UNIV
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