CN-117249252-B - Integral cooling type magnetic liquid sealing device

CN117249252BCN 117249252 BCN117249252 BCN 117249252BCN-117249252-B

Abstract

The invention discloses an integral cooling type magnetic liquid sealing device which comprises a rotating shaft, a flange jacket, a welding water jacket, a permanent magnet, a first pole shoe and a second pole shoe, wherein the rotating shaft comprises a liquid refrigerant inlet and outlet channel, a liquid refrigerant circulating cavity is formed between the flange jacket and the welding water jacket, the first pole shoe comprises a first annular cooling channel which circulates independently, the second pole shoe comprises a second annular cooling channel which circulates independently, the cross sections of pole teeth of the first pole shoe and the second pole shoe are funnel-shaped, and the heat conduction area of the pole teeth is increased while the magnetic field gradient in a sealing gap is ensured. The integral cooling type magnetic liquid sealing device provided by the embodiment of the invention realizes synchronous cooling of the high-pressure liquid refrigerant to the shaft and the jacket, can comprehensively reduce the temperature of the magnetic liquid, the permanent magnet, the bearing, the first pole shoe and the second pole shoe in the sealing device, and is suitable for working condition environments with high temperature and high rotating speed.

Inventors

XIE JUN
LAN HUIQING
LI DECAI
ZHANG YANJUAN

Assignees

北京交通大学

Dates

Publication Date: 20260512
Application Date: 20230920

Claims (2)

1. An integrally cooled magnetic liquid seal comprising: The left side of the rotating shaft is an atmospheric end, the right side of the rotating shaft is a high-temperature working chamber, the end face of the left side of the rotating shaft comprises a first shaft cold inlet, a first shaft cold outlet, a second shaft cold inlet and a second shaft cold outlet, the first shaft cold inlet, the first shaft cold outlet, the second shaft cold inlet and the second shaft cold outlet are communicated through a first through hole and a second through hole on the right side of a cylindrical surface of the rotating shaft, and the first shaft cold inlet, the first shaft cold outlet, the second shaft cold inlet and the second shaft cold outlet define a cooling channel of liquid refrigerant for the rotating shaft; the flange jacket defines a liquid state refrigerant circulating channel; A welding water jacket, wherein a liquid refrigerant circulation chamber is formed after the welding water jacket is welded with the flange jacket; A permanent magnet, which is a ring-shaped permanent magnet; The magnetic shoe comprises a rotary shaft, a first pole shoe and a second pole shoe, wherein each of the first pole shoe and the second pole shoe is sleeved on the outer side of the rotary shaft, a sealing gap is formed between the first pole shoe and the rotary shaft, the rotary shaft is filled with magnetic liquid, the center of the outer cylindrical surface of the first pole shoe comprises a first annular cooling channel, and the center of the outer cylindrical surface of the second pole shoe comprises a second annular cooling channel; The flange jacket, the welding water jacket, the first pole shoe and the second pole shoe define cooling spaces for liquid refrigerant aiming at the first pole shoe, the second pole shoe, the permanent magnet, the first bearing outer ring and the second bearing outer ring, and a circulating cavity formed by welding the flange jacket and the welding water jacket is communicated with a first annular cooling channel of the first pole shoe and a second annular cooling channel of the second pole shoe; the first end face sealing ring and the second end face sealing ring are respectively positioned in sealing grooves of the left end face and the right end face of the first pole shoe; The third end face sealing ring and the fourth end face sealing ring are respectively positioned in sealing grooves of the left end face and the right end face of the second pole shoe; the first radial sealing ring and the second radial sealing ring are positioned in the outer cylindrical surface sealing groove of the first pole shoe; The third radial sealing ring and the fourth radial sealing ring are positioned in the outer cylindrical surface sealing groove of the second pole shoe; the left end face of the first spacer is a narrow end face, and the right end face of the first spacer is a wide end face; the left end face of the second spacer is a wide end face, and the right end face of the second spacer is a narrow end face; The first end face sealing ring axially compresses with the right end face of the first spacer, the second end face sealing ring axially compresses with the left end face of the permanent magnet, and a first annular cooling channel is defined by the second end face sealing ring, the first radial sealing ring and the second radial sealing ring together; The third end face sealing ring axially compresses with the right end face of the permanent magnet, the fourth end face sealing ring axially compresses with the left end face of the second spacer, and a second annular cooling channel is defined together with the third radial sealing ring and the fourth radial sealing ring.
2. The integrally cooled magnetic liquid seal of claim 1 wherein said first and second pole pieces have inner cylindrical surfaces containing a plurality of pole piece teeth, said pole piece teeth being funnel-shaped in cross section, the portions of said pole piece teeth at the ends thereof in contact with the magnetic liquid being of small width and the pole piece teeth at the root thereof being of large width.

Description

Integral cooling type magnetic liquid sealing device Technical Field The invention relates to the technical field of mechanical engineering sealing, in particular to an integral cooling type magnetic liquid sealing device suitable for a high-temperature environment. Background The magnetic liquid seal has been widely used in vacuum and high pressure fields because of its advantages of low friction, zero leakage, long life, etc. When the magnetic liquid sealing device is applied to a high-speed rotation working condition, viscous friction between a rotating shaft and magnetic liquid can cause rapid temperature rise of a sealing part, high temperature of an external high-temperature reaction chamber can accelerate the occurrence of the condition, the temperature rise can cause rapid evaporation of a magnetic liquid base carrier liquid, finally, magnetic particles in the magnetic liquid are separated out, so that the sealing performance is reduced, and meanwhile, friction between a rolling body and an inner ring and an outer ring of a bearing part in the magnetic liquid sealing device can be increased under the high-speed rotation working condition, so that abrasion of the bearing is accelerated, and failure is caused. In the related art, a circulating liquid refrigerant is mostly adopted to cool the sealing part of the magnetic liquid sealing device, for example, in a magnetic liquid sealing device with a cooling system (patent number: 202111592697.2), a way of establishing a liquid refrigerant circulating channel at a magnet is proposed to cool the magnet and a pole shoe, a water-cooled magnetic liquid sealing device with a rotary joint (patent number: 201410380200.4) of a patent shaft sleeve is proposed to cool the sealing part of a rotary shaft externally connected with a water cooling sleeve, a magnetic liquid sealing device for a high-temperature-resistant stirrer (patent number: 202020240544.6) is proposed to cool a welding water cooling sleeve, the above cooling way only can cool a sealing gap or an outer sleeve locally, if only the outer sleeve is cooled, the bearing inner ring of the bearing part is heated and expanded to cause the bearing to be blocked, meanwhile, the sealing gap is not cooled sufficiently, if only the shaft is cooled, the high temperature at a permanent magnet causes the demagnetization of the permanent magnet, the magnetic field gradient of the sealing gap part is reduced, and the above way can accelerate the failure of the magnetic liquid sealing under the high temperature or high-speed working condition. Disclosure of Invention The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the invention provides the integral cooling type magnetic liquid sealing device, so that the integral cooling effect of the bearing, the pole shoe, the magnet and the magnetic liquid of the magnetic liquid sealing device is improved, the integral cooling device is suitable for the working condition environment with high temperature and high rotating speed, and the service life of the integral cooling type magnetic liquid sealing device is prolonged. The integral cooling type magnetic liquid sealing device comprises a rotating shaft, a locking end cover, a flange jacket, a welding water jacket, a first spacer, a second spacer, an O-shaped sealing ring, a first bearing, a second bearing, a first clamping spring, a second clamping spring, a permanent magnet, a first pole shoe, a second pole shoe, a first end face sealing ring, a second end face sealing ring, a third end face sealing ring, a fourth end face sealing ring, a first radial sealing ring, a second radial sealing ring, a third radial sealing ring, a fourth radial sealing ring and magnetic liquid. Connection between the parts of the device: And welding the flange jacket with the welding water jacket, forming a liquid refrigerant circulation chamber between the flange jacket and the welding water jacket after welding, and fixing the O-shaped sealing ring in a right end face groove of the flange jacket. The second clamp spring is fixed in a right clamp spring groove of the rotating shaft, a second bearing, a second isolation pad and a second pole shoe are sequentially arranged at the left end of the rotating shaft, magnetic liquid is injected into a radial gap between pole shoe pole teeth and the rotating shaft, a permanent magnet and a first pole shoe 1001 are sequentially arranged, magnetic liquid is injected into a radial gap between the pole shoe pole teeth and the rotating shaft, a first isolation pad and a first bearing are sequentially arranged, and the first clamp spring is used for axially positioning the parts mounted on the rotating shaft. And (3) loading the assembled rotating shaft into the hole of the flange sleeve from the left end to the bottom of the right side, and finally fixing the locking end cover at the left end of the flange sleeve through threaded connection.