CN110762224A - Divergent split-tooth stepped magnetic fluid rotary sealing device - Google Patents
Divergent split-tooth stepped magnetic fluid rotary sealing device Download PDFInfo
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- CN110762224A CN110762224A CN201911164988.4A CN201911164988A CN110762224A CN 110762224 A CN110762224 A CN 110762224A CN 201911164988 A CN201911164988 A CN 201911164988A CN 110762224 A CN110762224 A CN 110762224A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
Abstract
The invention aims to provide a divergent split-tooth stepped magnetic fluid rotary sealing device which comprises a shaft, a shell, a first pole shoe ring, a second pole shoe ring, a third pole shoe ring, a fourth pole shoe ring, a first sleeve, a second sleeve, a third sleeve, a first permanent magnet ring, a second permanent magnet ring and a third permanent magnet ring. The sealing device of the invention can not only improve the magnetic gathering effect and thus improve the pressure resistance of the magnetic fluid seal, but also effectively prevent the failure of the magnetic fluid seal caused by the action of centrifugal force, reduce the loss of the magnetic fluid, improve the reliability of the seal and prolong the service life.
Description
Technical Field
The invention belongs to the field of mechanical engineering sealing, and particularly relates to a divergent split-tooth stepped magnetic fluid rotary sealing device.
Background
The magnetic fluid is also called magnetic fluid or magnetic fluid, and is a novel functional material. In recent years, magnetic fluid is rapidly developed in the field of sealing, and magnetic fluid sealing is to firmly fix the magnetic fluid in a sealing gap by utilizing a magnetic field force generated by a permanent magnet in the sealing gap to resist the pressure difference between two sides, so that the sealing effect is achieved. And because many occasions of industry require very strict sealing, especially require that the seal does not leak, and this point can not be done to general traditional mechanical seal spare, the magnetofluid seal can solve above-mentioned problem well, and the magnetofluid sealing technique has zero leakage rate, no solid friction, advantages such as long-lived, high reliability compared with traditional sealing technique, has been widely applied to various trades.
The stepped sealing of the sleeve is realized by assembling the sleeve in a stepped manner, and the inner hole of the sleeve is processed with threads to form threaded connection with the shaft, so that a structure similar to a stepped shaft is formed. Namely, the size of the axial gap between each pole shoe and the corresponding sleeve is kept constant, so that a novel sealing mode is formed. Therefore, when saturated magnetic fluid is injected, the pressure resistance of the original magnetic fluid seal is improved, the leakage direction of the sealed medium is changed when the sealed medium leaks, the length of a leakage path is increased, and the pressure resistance of the seal is improved.
As for the sealing device described in reference 1 (patent publication No. CN 10311B) and the sealing device described in reference 2 (patent publication No. CN 207740466U), although the problem of leakage of the rotary seal at the time of a large clearance is solved on a certain basis, the shoulder height cannot be more than 10% of the shaft diameter at the time of design due to the limitation of the shaft processing conditions, and the pressure-proof effect cannot be obtained well in the axial clearance. The structure of the second document is a multi-stage disc magnetic fluid sealing device, which can solve the problem of low pressure resistance of the magnetic fluid sealing device to a certain extent, but when the radial gap is small, the pressure resistance effect of the axial pole teeth is obviously reduced, so that the sealing technology is difficult to be successfully applied to the fields of high speed and heavy load and the like. Therefore, a structure which is simple to assemble, can be used under the working condition of large radial run-out, has sufficient pressure-resistant sealing capability, has a single number of permanent magnets and has an obvious magnetic gathering effect is urgently needed.
Disclosure of Invention
The invention aims to provide a divergent split-tooth stepped magnetic fluid rotary sealing device, which can improve the magnetic gathering effect so as to improve the pressure resistance of the magnetic fluid seal, can effectively prevent the magnetic fluid seal from losing efficacy caused by the action of centrifugal force, reduces the loss of the magnetic fluid, and improves the reliability and the service life of the seal.
The technical scheme of the invention is as follows:
the divergent split-tooth stepped magnetic fluid rotary sealing device comprises a shaft, a shell, a first pole shoe ring, a second pole shoe ring, a third pole shoe ring, a fourth pole shoe ring, a first sleeve, a second sleeve, a third sleeve, a first permanent magnet ring, a second permanent magnet ring and a third permanent magnet ring;
the first pole shoe ring, the second pole shoe ring, the third pole shoe ring and the fourth pole shoe ring are sequentially arranged on the inner wall of the shell at intervals from left to right, and extend to the outer circular surface of the shaft along the radial direction, and a gap is reserved between the first pole shoe ring, the second pole shoe ring, the third pole shoe ring and the fourth pole shoe ring and the outer circular surface of the shaft;
the first permanent magnet ring, the second permanent magnet ring and the third permanent magnet ring are respectively arranged on the inner wall of the shell; the first permanent magnet ring is positioned between the first pole shoe ring and the second pole shoe ring, and two ends of the first permanent magnet ring are respectively contacted with the first pole shoe ring and the second pole shoe ring; the second permanent magnet ring is positioned between the second pole shoe ring and the third pole shoe ring, and two ends of the second permanent magnet ring are respectively contacted with the second pole shoe ring and the third pole shoe ring; the third permanent magnet ring is positioned between the third pole shoe ring and the fourth pole shoe ring, and two ends of the third permanent magnet ring are respectively contacted with the third pole shoe ring and the fourth pole shoe ring;
the first sleeve, the second sleeve and the third sleeve are sequentially arranged on the outer circular surface of the shaft at intervals in a thread fit manner from left to right, and the outer circular surfaces of the first sleeve, the second sleeve and the third sleeve respectively correspond to the inner circular surfaces of the first permanent magnet ring, the second permanent magnet ring and the third permanent magnet ring; the radial heights of the first sleeve, the second sleeve and the third sleeve are sequentially increased;
a concave surface I is arranged on one side, close to the shaft, of the right end surface of the first pole shoe ring, and a concave surface II is arranged on one side, close to the shaft, of the left end surface of the second pole shoe ring;
the concave surface I corresponds to the left end face of the first sleeve, and a plurality of groups of pole teeth a and pole teeth b are alternately arranged on the concave surface I at intervals along the radial direction of the concave surface I; a plurality of groups of pole teeth c and pole teeth d are alternately arranged on the left end surface of the first sleeve at intervals along the radial direction, the pole teeth a and the pole teeth b extend rightwards along the axial direction, and the pole teeth c and the pole teeth d extend leftwards along the axial direction; the right end surface of the pole tooth a corresponds to the left end surface of the pole tooth c, a gap is reserved between the right end surface of the pole tooth a and the left end surface of the pole tooth c, and the gap is filled with magnetic fluid; the right end surface of the pole tooth b corresponds to the left end surface of the pole tooth d, a gap is reserved between the right end surface of the pole tooth b and the left end surface of the pole tooth d, and the gap is filled with magnetic fluid;
the concave surface II corresponds to the right end face of the first sleeve, and a plurality of groups of pole teeth e and pole teeth f are alternately arranged on the concave surface II along the radial direction of the concave surface II at intervals; a plurality of groups of pole teeth g and pole teeth h are alternately arranged on the left end surface of the first sleeve at intervals along the radial direction, the pole teeth e and the pole teeth f axially extend leftwards, and the pole teeth g and the pole teeth h axially extend rightwards; the left end surface of the pole tooth e corresponds to the right end surface of the pole tooth g, a gap is reserved between the left end surface of the pole tooth e and the right end surface of the pole tooth g, and the gap is filled with magnetic fluid; the left end surface of the pole tooth f corresponds to the right end surface of the pole tooth h, a gap is reserved between the left end surface of the pole tooth f and the right end surface of the pole tooth h, and the gap is filled with magnetic fluid;
a concave surface III is arranged on one side, close to the shaft, of the right end surface of the second pole shoe ring, and a concave surface IV is arranged on one side, close to the shaft, of the left end surface of the third pole shoe ring;
the concave surface III corresponds to the left end face of the second sleeve, and a plurality of groups of pole teeth i and pole teeth j are alternately arranged on the concave surface III along the radial direction of the concave surface III; a plurality of groups of pole teeth k and pole teeth l are alternately arranged on the left end surface of the second sleeve at intervals along the radial direction, the pole teeth i and the pole teeth j extend rightwards along the axial direction, and the pole teeth k and the pole teeth l extend leftwards along the axial direction; the right end surface of the pole tooth i corresponds to the left end surface of the pole tooth j, a gap is reserved between the right end surface of the pole tooth i and the left end surface of the pole tooth j, and the gap is filled with magnetic fluid; the right end face of the pole tooth k corresponds to the left end face of the pole tooth l, a gap is reserved between the right end face of the pole tooth k and the left end face of the pole tooth l, and magnetic fluid is filled in the gap;
the concave surface IV corresponds to the right end face of the second sleeve, and a plurality of groups of pole teeth m and pole teeth n are alternately arranged on the concave surface IV at intervals along the radial direction of the concave surface IV; a plurality of groups of pole teeth o and pole teeth p are alternately arranged on the left end surface of the second sleeve at intervals along the radial direction, the pole teeth m and the pole teeth n extend leftwards along the axial direction, and the pole teeth o and the pole teeth p extend rightwards along the axial direction; the left end surface of the pole tooth m corresponds to the right end surface of the pole tooth o, a gap is reserved between the left end surface of the pole tooth m and the right end surface of the pole tooth o, and the gap is filled with magnetic fluid; the left end surface of the pole tooth n corresponds to the right end surface of the pole tooth p, a gap is reserved between the left end surface of the pole tooth n and the right end surface of the pole tooth p, and the gap is filled with magnetic fluid;
a concave surface V is arranged on one side, close to the shaft, of the right end surface of the third pole shoe ring, and a concave surface VI is arranged on one side, close to the shaft, of the left end surface of the fourth pole shoe ring;
the concave surface V corresponds to the left end surface of the third sleeve, and a plurality of groups of pole teeth q and pole teeth r are alternately arranged on the concave surface V at intervals along the radial direction of the concave surface V; a plurality of groups of pole teeth s and t are alternately arranged on the left end surface of the third sleeve at intervals along the radial direction, the pole teeth q and the pole teeth r extend rightwards along the axial direction, and the pole teeth s and the pole teeth t extend leftwards along the axial direction; the right end surface of the pole tooth q corresponds to the left end surface of the pole tooth s, a gap is reserved between the right end surface of the pole tooth q and the left end surface of the pole tooth s, and the gap is filled with magnetic fluid; the right end surface of the pole tooth r corresponds to the left end surface of the pole tooth t, a gap is reserved between the right end surface of the pole tooth r and the left end surface of the pole tooth t, and magnetic fluid is filled in the gap;
the concave surface VI corresponds to the right end face of the third sleeve, and a plurality of groups of pole teeth u and pole teeth v are alternately arranged on the concave surface VI along the radial direction of the concave surface VI at intervals; a plurality of groups of pole teeth w and pole teeth x are alternately arranged on the left end surface of the third sleeve at intervals along the radial direction, the pole teeth u and the pole teeth v extend leftwards along the axial direction, and the pole teeth w and the pole teeth x extend rightwards along the axial direction; the left end surface of the pole tooth u corresponds to the right end surface of the pole tooth w, a gap is reserved between the left end surface of the pole tooth u and the right end surface of the pole tooth w, and the gap is filled with magnetic fluid; the left end surface of the pole tooth v corresponds to the right end surface of the pole tooth x, a gap is reserved between the left end surface of the pole tooth v and the right end surface of the pole tooth x, and the gap is filled with magnetic fluid.
The magnetic fluid between the right end face of the pole tooth a and the left end face of the pole tooth c is distributed in a staggered manner with the magnetic fluid between the right end face of the pole tooth b and the left end face of the pole tooth d in the radial direction; the magnetic fluid between the left end face of the pole tooth e and the right end face of the pole tooth g is distributed in a staggered manner with the magnetic fluid between the left end face of the pole tooth f and the right end face of the pole tooth h in the radial direction;
the magnetic fluid between the right end face of the pole tooth i and the left end face of the pole tooth j is distributed in a staggered manner with the magnetic fluid between the right end face of the pole tooth k and the left end face of the pole tooth l in the radial direction; the magnetic fluid between the left end surface of the pole tooth m and the pole tooth o is distributed in a staggered manner with the magnetic fluid between the left end surface of the pole tooth n and the right end surface of the pole tooth p in the radial direction;
the magnetic fluid between the right end face of the pole tooth q and the left end face of the pole tooth s is distributed in a staggered manner with the magnetic fluid between the right end face of the pole tooth r and the left end face of the pole tooth t in the radial direction; and the magnetic fluid between the left end surface of the pole tooth u and the right end surface of the pole tooth w is distributed in a staggered manner with the magnetic fluid between the left end surface of the pole tooth v and the right end surface of the pole tooth x in the radial direction.
1-5 pole teeth a are arranged, and the pole teeth c are arranged corresponding to the pole teeth a 15; 1-5 pole teeth are distributed on the pole teeth b, and the pole teeth d are arranged corresponding to the pole teeth b;
1-5 pole teeth e are arranged, and g is arranged corresponding to the pole teeth e; 1-5 pole teeth f are arranged, and the pole teeth h are arranged corresponding to the pole teeth f;
1-5 pole teeth i are arranged, and the pole teeth k are arranged corresponding to the pole teeth i; 1-5 pole teeth j are arranged on the pole teeth, and the pole teeth l are arranged corresponding to the pole teeth j;
1-5 pole teeth m are arranged, and the pole teeth o are arranged corresponding to the pole teeth m; 1-5 pole teeth are arranged on the pole teeth n, and the pole teeth p are arranged corresponding to the pole teeth n;
1-5 pole teeth q are arranged, and the pole teeth s are arranged corresponding to the pole teeth q; 1-5 pole teeth r are arranged, and the pole teeth t are arranged corresponding to the pole teeth r;
1-5 pole teeth u are arranged, and the pole teeth w are arranged corresponding to the pole teeth u; the number of the pole teeth v is 1-5, and the pole teeth x are arranged corresponding to the pole teeth v.
The shaft is made of a non-magnetic conductive material.
The outer circular surfaces of the first pole shoe ring, the second pole shoe ring, the third pole shoe ring and the fourth pole shoe ring are provided with annular grooves I, and sealing rings I are arranged in the annular grooves I.
The first permanent magnet ring, the second permanent magnet ring and the third permanent magnet ring are axial magnetizing permanent magnets; the magnetic force lines of the first permanent magnet ring and the second permanent magnet ring are opposite in direction, and the magnetic force lines of the first permanent magnet ring and the third permanent magnet ring are identical in direction.
The divergent split-tooth stepped magnetic fluid rotary sealing device further comprises a left bearing sleeve, a right bearing sleeve, a left bearing and a right bearing, wherein the left bearing sleeve and the right bearing sleeve are arranged on the inner wall of the shell, the left bearing sleeve is positioned on the left side of the first pole shoe ring and is in contact with the left end face of the first pole shoe ring, the left bearing is arranged in the left bearing sleeve, the inner ring of the left bearing is sleeved on the shaft, and the outer ring of the left bearing is in contact with the inner ring of the left bearing sleeve; the right bearing sleeve is positioned on the right side of the fourth pole shoe ring and is in contact with the right end face of the fourth pole shoe ring, the right bearing is arranged in the right bearing sleeve, the inner ring of the right bearing is sleeved on the shaft, and the outer ring of the right bearing is in contact with the inner ring of the right bearing sleeve.
The divergent split-tooth stepped magnetic fluid rotary sealing device further comprises a left spacer bush and a right spacer bush; the right end of the inner circular surface of the left bearing is provided with an annular groove II, the annular groove II is positioned on the right side of the left bearing, the left spacer bush is arranged in the annular groove II, and the right end surface of the left spacer bush is in contact with the left side wall of the first pole shoe ring; and an annular groove III is formed in the right end of the inner circular surface of the right bearing, the annular groove III is positioned on the right side of the right bearing, the right spacer sleeve is arranged in the annular groove III, and the right end surface of the right spacer sleeve is in contact with the right side wall of the fourth pole shoe ring.
And the outer circular surfaces of the left spacer bush and the right spacer bush are provided with annular grooves IV, and sealing rings II are arranged in the annular grooves IV.
The invention has wider application range and can be applied to rotating shafts with the radius of 10-300 mm.
According to the divergent split-tooth stepped magnetic fluid rotary sealing device with the unique structure, the sleeve structure is added, the leakage path is changed, an axial sealing gap is formed between the axial pole teeth of the sleeve and the pole shoe pole teeth, the permanent magnet is embedded between the pole shoes, the magnetic fluid is injected into the axial sealing gap formed by the pole shoes and the sleeve, and the magnetic fluid forms a plurality of O-shaped sealing rings under the action of the permanent magnet, so that the sealing effect is achieved, the sealing pressure resistance is improved, and the divergent split-tooth stepped magnetic fluid rotary sealing device is realized.
The existing sealing device mostly reduces the sealing gap value in order to improve the pressure resistance value, so that the magnetic resistance generated by the sealing gap is reduced, the magnetic flux density is increased, the sealing pressure resistance value is promoted, but when heavy load is carried, the radial direction can generate large radial runout, and the magnetic fluid sealing fails. When the permanent magnet shaft is designed, the shaft material is firstly changed into a non-magnetic material, and according to the magnetic circuit theorem, the magnetic circuit returns to the permanent magnet S pole after the axial gap from the permanent magnet N pole to the pole shoe reaches the sleeve. Because the shaft is made of the non-magnetic conductive material, when the magnetic circuit passes through the radial gap, the radial magnetic resistance is increased sharply, the magnetic circuit passes through the axial gap more, and the magnetic concentration effect of the axial gap is more obvious.
The sleeve and the shaft are in threaded fit, and compared with a stepped shaft, the axial height can be increased under the action of not increasing stress concentration, so that the number of axial pole teeth is increased, and the sealing pressure resistance value is increased. In addition, the split pole teeth are staggered, so that the magnetism gathering effect is greatly improved, the loss of the volume of the magnetic fluid is effectively reduced, and the influence of centrifugal force on the magnetic fluid is also reduced. The invention also has the advantages of greatly improving the self-healing of the magnetic fluid seal, greatly reducing the magnetic fluid which can be taken away when the magnetic fluid seal fails, further improving the pressure resistance and the sealing reliability of the magnetic fluid seal under the condition of rotary sealing and expanding the safe working range of the magnetic fluid seal.
The invention can effectively solve the problems of insufficient pressure resistance, low magnetism gathering effect and serious magnetic fluid loss of the sealing device of the rotating shaft under the condition of large clearance.
Drawings
Fig. 1 is a schematic structural view of a sealing device according to the present invention.
The serial number designations and corresponding designations in the drawings are as follows:
1-axis, 2-housing, 3-first pole shoe ring, 4-second pole shoe ring, 5-third pole shoe ring, 6-fourth pole shoe ring, 7-first sleeve, 8-second sleeve, 9-third sleeve, 10-first permanent magnet ring, 11-second permanent magnet ring, 12-third permanent magnet ring, 13-concave surface I, 14-concave surface II, 15-pole tooth a, 16-pole tooth b, 17-pole tooth c, 18-pole tooth d, 19-pole tooth e, 20-pole tooth f, 21-pole tooth g, 22-pole tooth h, 23-concave surface III, 24-concave surface IV, 25-pole tooth i, 26-pole tooth j, 27-pole tooth k, 28-pole tooth l, 29-pole tooth m, 30-pole tooth n, 31-pole tooth o, 32-pole tooth p, 33-concave surface V, 34-concave surface VI, 35-pole tooth q, 36-pole tooth r, 37-pole tooth s, 38-pole tooth t, 39-pole tooth u, 40-pole tooth v, 41-pole tooth w, 42-pole tooth x, 43-sealing ring II, 44-sealing ring I, 45-left bearing sleeve, 46-right bearing sleeve, 47-left bearing, 48-right bearing, 49-left spacer and 50-right spacer.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, the divergent split-tooth stepped magnetic fluid rotary sealing device includes a shaft 1, a housing 2, a first pole shoe ring 3, a second pole shoe ring 4, a third pole shoe ring 5, a fourth pole shoe ring 6, a first sleeve 7, a second sleeve 8, a third sleeve 9, a first permanent magnet ring 10, a second permanent magnet ring 11, and a third permanent magnet ring 12;
the first pole shoe ring 3, the second pole shoe ring 4, the third pole shoe ring 5 and the fourth pole shoe ring 6 are sequentially arranged on the inner wall of the shell 2 from left to right at intervals, the first pole shoe ring 3, the second pole shoe ring 4, the third pole shoe ring 5 and the fourth pole shoe ring 6 extend to the outer circular surface of the shaft 1 along the radial direction, and a gap is reserved between the first pole shoe ring 3, the second pole shoe ring 4, the third pole shoe ring 5 and the fourth pole shoe ring 6 and the outer circular surface of the shaft 1;
the first permanent magnet ring 10, the second permanent magnet ring 11 and the third permanent magnet ring 12 are respectively arranged on the inner wall of the shell 2; the first permanent magnet ring 10 is positioned between the first pole shoe ring 3 and the second pole shoe ring 4, and two ends of the first permanent magnet ring 10 are respectively contacted with the first pole shoe ring 3 and the second pole shoe ring 4; the second permanent magnet ring 11 is positioned between the second pole shoe ring 4 and the third pole shoe ring 5, and two ends of the second permanent magnet ring 11 are respectively contacted with the second pole shoe ring 4 and the third pole shoe ring 5; the third permanent magnet ring 12 is positioned between the third pole shoe ring 5 and the fourth pole shoe ring 6, and two ends of the third permanent magnet ring 12 are respectively contacted with the third pole shoe ring 5 and the fourth pole shoe ring 6;
the first sleeve 7, the second sleeve 8 and the third sleeve 9 are sequentially arranged on the outer circular surface of the shaft 1 at intervals in a threaded fit from left to right, and the outer circular surfaces of the first sleeve 7, the second sleeve 8 and the third sleeve 9 respectively correspond to the inner circular surfaces of the first permanent magnet ring 10, the second permanent magnet ring 11 and the third permanent magnet ring 12; the radial heights of the first sleeve 7, the second sleeve 8 and the third sleeve 9 are sequentially increased;
a concave surface I13 is arranged on one side, close to the shaft 1, of the right end surface of the first pole shoe ring 3, and a concave surface II 14 is arranged on one side, close to the shaft 1, of the left end surface of the second pole shoe ring 4;
the concave surface I13 corresponds to the left end face of the first sleeve 7, and a plurality of groups of pole teeth a15 and pole teeth b16 are alternately arranged on the concave surface I13 at intervals along the radial direction of the concave surface I13; a plurality of groups of pole teeth c17 and d18 are alternately arranged on the left end surface of the first sleeve 7 at intervals along the radial direction, the pole teeth a15 and the pole teeth b16 extend rightwards along the axial direction, and the pole teeth c17 and the pole teeth d18 extend leftwards along the axial direction; the right end face of the pole tooth a15 corresponds to the left end face of the pole tooth c17, a gap is reserved between the right end face of the pole tooth a15 and the left end face of the pole tooth c17, and magnetic fluid is filled in the gap; the right end face of the pole tooth b16 corresponds to the left end face of the pole tooth d18, a gap is reserved between the right end face of the pole tooth b16 and the left end face of the pole tooth d18, and magnetic fluid is filled in the gap;
the concave surface II 14 corresponds to the right end face of the first sleeve 7, and a plurality of groups of pole teeth e19 and pole teeth f20 are alternately arranged on the concave surface II 14 at intervals along the radial direction of the concave surface II; a plurality of groups of pole teeth g21 and h22 are alternately arranged on the left end surface of the first sleeve 7 at intervals along the radial direction, the pole teeth e19 and f20 axially extend leftwards, and the pole teeth g21 and h22 axially extend rightwards; the left end surface of the pole tooth e19 corresponds to the right end surface of the pole tooth g21, a gap is reserved between the left end surface of the pole tooth e19 and the right end surface of the pole tooth g21, and magnetic fluid is filled in the gap; the left end face of the pole tooth f20 corresponds to the right end face of the pole tooth h22, a gap is reserved between the left end face of the pole tooth f20 and the right end face of the pole tooth h22, and magnetic fluid is filled in the gap;
a concave surface III 23 is arranged on one side, close to the shaft 1, of the right end surface of the second pole shoe ring 4, and a concave surface IV 24 is arranged on one side, close to the shaft 1, of the left end surface of the third pole shoe ring 5;
the concave surface III 23 corresponds to the left end surface of the second sleeve 8, and a plurality of groups of pole teeth i25 and pole teeth j26 are alternately arranged on the concave surface III 23 at intervals along the radial direction of the concave surface III; a plurality of groups of pole teeth k27 and pole teeth l28 are alternately arranged on the left end surface of the second sleeve 8 at intervals along the radial direction, the pole teeth i25 and the pole teeth j26 extend rightwards along the axial direction, and the pole teeth k27 and the pole teeth l28 extend leftwards along the axial direction; the right end face of the pole tooth i25 corresponds to the left end face of the pole tooth j27, a gap is reserved between the right end face of the pole tooth i25 and the left end face of the pole tooth j27, and magnetic fluid is filled in the gap; the right end face of the pole tooth k26 corresponds to the left end face of the pole tooth l28, a gap is reserved between the right end face of the pole tooth k26 and the left end face of the pole tooth l28, and magnetic fluid is filled in the gap;
the concave surface IV 24 corresponds to the right end face of the second sleeve 8, and a plurality of groups of pole teeth m29 and pole teeth n30 are alternately arranged on the concave surface IV 24 at intervals along the radial direction of the concave surface IV 24; a plurality of groups of pole teeth o31 and pole teeth p32 are alternately arranged on the left end surface of the second sleeve 8 at intervals along the radial direction, the pole teeth m29 and the pole teeth n30 axially extend leftwards, and the pole teeth o31 and the pole teeth p32 axially extend rightwards; the left end face of the pole tooth m29 corresponds to the right end face of the pole tooth o31, a gap is reserved between the left end face of the pole tooth m29 and the right end face of the pole tooth o31, and magnetic fluid is filled in the gap; the left end face of the pole tooth n30 corresponds to the right end face of the pole tooth p32, a gap is reserved between the left end face of the pole tooth n30 and the right end face of the pole tooth p32, and magnetic fluid is filled in the gap;
a concave surface V33 is arranged on one side, close to the shaft 1, of the right end surface of the third pole shoe ring 5, and a concave surface VI 34 is arranged on one side, close to the shaft 1, of the left end surface of the fourth pole shoe ring 6;
the concave surface V33 corresponds to the left end surface of the third sleeve 9, and a plurality of groups of pole teeth q35 and r36 are alternately arranged on the concave surface V33 at intervals along the radial direction of the concave surface V33; a plurality of groups of pole teeth s37 and t38 are alternately arranged on the left end surface of the third sleeve 9 at intervals along the radial direction, the pole teeth q35 and the pole teeth r36 extend rightwards along the axial direction, and the pole teeth s37 and the pole teeth t38 extend leftwards along the axial direction; the right end face of the pole tooth q35 corresponds to the left end face of the pole tooth s37, a gap is reserved between the right end face of the pole tooth q35 and the left end face of the pole tooth s37, and magnetic fluid is filled in the gap; the right end face of the pole tooth r36 corresponds to the left end face of the pole tooth t38, a gap is reserved between the right end face of the pole tooth r36 and the left end face of the pole tooth t38, and magnetic fluid is filled in the gap;
the concave surface VI 34 corresponds to the right end face of the third sleeve 9, and a plurality of groups of pole teeth u39 and pole teeth v40 are alternately arranged on the concave surface VI 34 at intervals along the radial direction of the concave surface VI; a plurality of groups of pole teeth w41 and pole teeth x42 are alternately arranged on the left end surface of the third sleeve 9 at intervals along the radial direction, the pole teeth u39 and the pole teeth v40 axially extend leftwards, and the pole teeth w41 and the pole teeth x42 axially extend rightwards; the left end face of the pole tooth u39 corresponds to the right end face of the pole tooth w41, a gap is reserved between the left end face of the pole tooth u39 and the right end face of the pole tooth w41, and magnetic fluid is filled in the gap; the left end face of the pole tooth v40 corresponds to the right end face of the pole tooth x42, a gap is reserved between the left end face and the right end face, and the gap is filled with magnetic fluid.
The magnetic fluid between the right end face of the pole tooth a15 and the left end face of the pole tooth c17 is distributed in a staggered manner with the magnetic fluid between the right end face of the pole tooth b16 and the left end face of the pole tooth d18 in the radial direction; the magnetic fluid between the left end face of the pole tooth e19 and the right end face of the pole tooth g21 is distributed in a staggered manner with the magnetic fluid between the left end face of the pole tooth f20 and the right end face of the pole tooth h22 in the radial direction;
the magnetic fluid between the right end face of the pole tooth i25 and the left end face of the pole tooth j27 is distributed in a staggered manner with the magnetic fluid between the right end face of the pole tooth k26 and the left end face of the pole tooth l28 in the radial direction; the magnetic fluid between the left end surface of the pole tooth m29 and the pole tooth o31 is distributed in a staggered manner with the magnetic fluid between the left end surface of the pole tooth n30 and the right end surface of the pole tooth p32 in the radial direction;
the magnetic fluid between the right end face of the pole tooth q35 and the left end face of the pole tooth s37 is distributed in a staggered manner with the magnetic fluid between the right end face of the pole tooth r36 and the left end face of the pole tooth t38 in the radial direction; and the magnetic fluid between the left end surface of the pole tooth u39 and the right end surface of the pole tooth w41 is distributed in a staggered manner with the magnetic fluid between the left end surface of the pole tooth v40 and the right end surface of the pole tooth x42 in the radial direction.
1-5 pole teeth a15 are provided, and the pole teeth c17 are provided corresponding to the pole teeth a 15; 1-5 polar teeth b16 are distributed, and the polar teeth d18 are arranged corresponding to the polar teeth b 16;
1-5 pole teeth e19 are arranged, and g21 is arranged corresponding to the pole teeth e 19; 1-5 pole teeth f20 are provided, and the pole teeth h22 are provided corresponding to the pole teeth f 20;
1-5 pole teeth i25 are arranged, and the pole teeth k26 are arranged corresponding to the pole teeth i 25; 1-5 pole teeth j27 are provided, and the pole teeth l28 are provided corresponding to the pole teeth j 27;
1-5 pole teeth m29 are arranged, and the pole teeth o31 are arranged corresponding to the pole teeth m 29; 1-5 pole teeth n30 are provided, and the pole teeth p32 are provided corresponding to the pole teeth n 30;
1-5 pole teeth q35 are provided, and the pole teeth s37 are arranged corresponding to the pole teeth q 35; 1-5 pole teeth r36 are arranged, and the pole teeth t38 are arranged corresponding to the pole teeth r 36;
1-5 pole teeth u39 are arranged, and the pole teeth w41 are arranged corresponding to the pole teeth u 39; the number of the pole teeth v40 is 1-5, and the pole teeth x42 are arranged corresponding to the pole teeth v 40.
The shaft 1 is made of a non-magnetic material.
The first pole shoe ring 3, the second pole shoe ring 4, the third pole shoe ring 5 and the fourth pole shoe ring 6 are provided with annular grooves I on the outer circular surfaces, and sealing rings I44 are arranged in the annular grooves I.
The first permanent magnet ring 10, the second permanent magnet ring 11 and the third permanent magnet ring 12 are axial magnetizing permanent magnets; the directions of the magnetic lines of the first permanent magnet ring 10 and the second permanent magnet ring 11 are opposite, and the directions of the magnetic lines of the first permanent magnet ring 10 and the third permanent magnet ring 12 are the same.
The divergent split-tooth stepped magnetic fluid rotary sealing device further comprises a left bearing sleeve 45, a right bearing sleeve 46, a left bearing 47 and a right bearing 48, wherein the left bearing sleeve 45 and the right bearing sleeve 46 are arranged on the inner wall of the shell 2, the left bearing sleeve 45 is positioned on the left side of the first pole shoe ring 3 and is in contact with the left end face of the first pole shoe ring 3, the left bearing 47 is arranged in the left bearing sleeve 45, the inner ring of the left bearing 47 is sleeved on the shaft 1, and the outer ring of the left bearing 47 is in contact with the inner ring of the left bearing sleeve 45; the right bearing sleeve 46 is positioned on the right side of the fourth pole shoe ring 6 and is in contact with the right end face of the fourth pole shoe ring 6, the right bearing 48 is arranged in the right bearing sleeve 46, the inner ring of the right bearing 48 is sleeved on the shaft 1, and the outer ring of the right bearing 48 is in contact with the inner ring of the right bearing sleeve 46.
The divergent split-tooth stepped magnetic fluid rotary sealing device further comprises a left spacer 49 and a right spacer 50; an annular groove II is formed in the right end of the inner circular surface of the left bearing 47, the annular groove II is located on the right side of the left bearing 47, the left spacer 49 is arranged in the annular groove II, and the right end face of the left spacer 49 is in contact with the left side wall of the first pole shoe ring 3; an annular groove III is formed in the right end of the inner circular surface of the right bearing 48, the annular groove III is located on the right side of the right bearing 48, the right spacer sleeve 50 is arranged in the annular groove III, and the right end face of the right spacer sleeve 50 is in contact with the right side wall of the fourth pole shoe ring 6.
And annular grooves IV are formed in the outer circular surfaces of the left spacer 49 and the right spacer 50, and sealing rings II43 are arranged in the annular grooves IV.
Claims (9)
1. The utility model provides a divergent cascaded magnetic current body rotary seal device of tooth that bisects, includes axle (1), shell (2), first pole shoe ring (3), second pole shoe ring (4), third pole shoe ring (5), fourth pole shoe ring (6), first sleeve (7), second sleeve (8), third sleeve (9), first permanent magnet ring (10), second permanent magnet ring (11), third permanent magnet ring (12), its characterized in that:
the first pole shoe ring (3), the second pole shoe ring (4), the third pole shoe ring (5) and the fourth pole shoe ring (6) are sequentially arranged on the inner wall of the shell (2) at intervals from left to right, the first pole shoe ring (3), the second pole shoe ring (4), the third pole shoe ring (5) and the fourth pole shoe ring (6) extend to the outer circular surface of the shaft (1) along the radial direction, and a gap is reserved between the first pole shoe ring (3), the second pole shoe ring (4), the third pole shoe ring (5) and the fourth pole shoe ring (6) and the outer circular surface of;
the first permanent magnet ring (10), the second permanent magnet ring (11) and the third permanent magnet ring (12) are respectively arranged on the inner wall of the shell (2); the first permanent magnet ring (10) is positioned between the first pole shoe ring (3) and the second pole shoe ring (4), and two ends of the first permanent magnet ring (10) are respectively contacted with the first pole shoe ring (3) and the second pole shoe ring (4); the second permanent magnet ring (11) is positioned between the second pole shoe ring (4) and the third pole shoe ring (5), and two ends of the second permanent magnet ring (11) are respectively contacted with the second pole shoe ring (4) and the third pole shoe ring (5); the third permanent magnet ring (12) is positioned between the third pole shoe ring (5) and the fourth pole shoe ring (6), and two ends of the third permanent magnet ring (12) are respectively contacted with the third pole shoe ring (5) and the fourth pole shoe ring (6);
the first sleeve (7), the second sleeve (8) and the third sleeve (9) are sequentially arranged on the outer circular surface of the shaft (1) from left to right in a threaded fit at intervals, and the outer circular surfaces of the first sleeve (7), the second sleeve (8) and the third sleeve (9) correspond to the inner circular surfaces of the first permanent magnet ring (10), the second permanent magnet ring (11) and the third permanent magnet ring (12) respectively; the radial heights of the first sleeve (7), the second sleeve (8) and the third sleeve (9) are sequentially increased;
a concave surface I (13) is arranged on one side, close to the shaft (1), of the right end surface of the first pole shoe ring (3), and a concave surface II (14) is arranged on one side, close to the shaft (1), of the left end surface of the second pole shoe ring (4);
the concave surface I (13) corresponds to the left end face of the first sleeve (7), and a plurality of groups of pole teeth a (15) and pole teeth b (16) are alternately arranged on the concave surface I (13) at intervals along the radial direction of the concave surface I; a plurality of groups of pole teeth c (17) and pole teeth d (18) are alternately arranged on the left end surface of the first sleeve (7) at intervals along the radial direction, the pole teeth a (15) and the pole teeth b (16) extend rightwards along the axial direction, and the pole teeth c (17) and the pole teeth d (18) extend leftwards along the axial direction; the right end surface of the pole tooth a (15) and the left end surface of the pole tooth c (17) correspond to each other, a gap is reserved between the right end surface of the pole tooth a and the left end surface of the pole tooth c (17), and magnetic fluid is filled in the gap; the right end surface of the pole tooth b (16) and the left end surface of the pole tooth d (18) correspond to each other, a gap is reserved between the right end surface of the pole tooth b and the left end surface of the pole tooth d, and magnetic fluid is filled in the gap;
the concave surface II (14) corresponds to the right end face of the first sleeve (7), and a plurality of groups of pole teeth e (19) and pole teeth f (20) are alternately arranged on the concave surface II (14) at intervals along the radial direction of the concave surface II; a plurality of groups of pole teeth g (21) and pole teeth h (22) are alternately arranged on the left end surface of the first sleeve (7) at intervals along the radial direction, the pole teeth e (19) and the pole teeth f (20) extend leftwards along the axial direction, and the pole teeth g (21) and the pole teeth h (22) extend rightwards along the axial direction; the left end surface of the pole tooth e (19) and the right end surface of the pole tooth g (21) correspond to each other, a gap is reserved between the left end surface and the right end surface, and the gap is filled with magnetic fluid; the left end surface of the pole tooth f (20) and the right end surface of the pole tooth h (22) correspond to each other, a gap is reserved between the left end surface and the right end surface, and the gap is filled with magnetic fluid;
a concave surface III (23) is arranged on one side, close to the shaft (1), of the right end surface of the second pole shoe ring (4), and a concave surface IV (24) is arranged on one side, close to the shaft (1), of the left end surface of the third pole shoe ring (5);
the concave surface III (23) corresponds to the left end face of the second sleeve (8), and a plurality of groups of pole teeth i (25) and pole teeth j (26) are alternately arranged on the concave surface III (23) at intervals along the radial direction of the concave surface III; a plurality of groups of pole teeth k (27) and pole teeth l (28) are alternately arranged on the left end surface of the second sleeve (8) at intervals along the radial direction, the pole teeth i (25) and the pole teeth j (26) extend rightwards along the axial direction, and the pole teeth k (27) and the pole teeth l (28) extend leftwards along the axial direction; the right end surface of the pole tooth i (25) and the left end surface of the pole tooth j (27) correspond to each other, a gap is reserved between the right end surface of the pole tooth i (25) and the left end surface of the pole tooth j (27), and the gap is filled with magnetic fluid; the right end surface of the pole tooth k (26) and the left end surface of the pole tooth l (28) correspond to each other, a gap is reserved between the right end surface of the pole tooth k and the left end surface of the pole tooth l, and magnetic fluid is filled in the gap;
the concave surface IV (24) corresponds to the right end face of the second sleeve (8), and a plurality of groups of pole teeth m (29) and pole teeth n (30) are alternately arranged on the concave surface IV (24) at intervals along the radial direction of the concave surface IV; a plurality of groups of pole teeth o (31) and pole teeth p (32) are alternately arranged on the left end surface of the second sleeve (8) at intervals along the radial direction, the pole teeth m (29) and the pole teeth n (30) extend leftwards along the axial direction, and the pole teeth o (31) and the pole teeth p (32) extend rightwards along the axial direction; the left end surface of the pole tooth m (29) and the right end surface of the pole tooth o (31) correspond to each other, a gap is reserved between the left end surface and the right end surface, and the gap is filled with magnetic fluid; the left end surface of the pole tooth n (30) and the right end surface of the pole tooth p (32) correspond to each other, a gap is reserved between the left end surface and the right end surface, and the gap is filled with magnetic fluid;
a concave surface V (33) is arranged on one side, close to the shaft (1), of the right end surface of the third pole shoe ring (5), and a concave surface VI (34) is arranged on one side, close to the shaft (1), of the left end surface of the fourth pole shoe ring (6);
the concave surface V (33) corresponds to the left end surface of the third sleeve (9), and a plurality of groups of pole teeth q (35) and pole teeth r (36) are alternately arranged on the concave surface V (33) at intervals along the radial direction of the concave surface V (33); a plurality of groups of pole teeth s (37) and t (38) are alternately arranged on the left end surface of the third sleeve (9) at intervals along the radial direction, the pole teeth q (35) and the pole teeth r (36) extend rightwards along the axial direction, and the pole teeth s (37) and the pole teeth t (38) extend leftwards along the axial direction; the right end surface of the pole tooth q (35) corresponds to the left end surface of the pole tooth s (37), a gap is reserved between the right end surface of the pole tooth q and the left end surface of the pole tooth s (37), and the gap is filled with magnetic fluid; the right end surface of the pole tooth r (36) and the left end surface of the pole tooth t (38) correspond to each other, a gap is reserved between the right end surface of the pole tooth r and the left end surface of the pole tooth t, and magnetic fluid is filled in the gap;
the concave surface VI (34) corresponds to the right end face of the third sleeve (9), and a plurality of groups of pole teeth u (39) and pole teeth v (40) are alternately arranged on the concave surface VI (34) at intervals along the radial direction of the concave surface VI; a plurality of groups of pole teeth w (41) and pole teeth x (42) are alternately arranged on the left end surface of the third sleeve (9) at intervals along the radial direction, the pole teeth u (39) and the pole teeth v (40) axially extend leftwards, and the pole teeth w (41) and the pole teeth x (42) axially extend rightwards; the left end surface of the pole tooth u (39) and the right end surface of the pole tooth w (41) correspond to each other, a gap is reserved between the left end surface of the pole tooth u and the right end surface of the pole tooth w, and magnetic fluid is filled in the gap; the left end surface of the pole tooth v (40) and the right end surface of the pole tooth x (42) correspond to each other, a gap is reserved between the left end surface and the right end surface, and the gap is filled with magnetic fluid.
2. The divergent split-tooth stepped magnetic fluid rotary seal device according to claim 1, wherein:
the magnetic fluid between the right end surface of the pole tooth a (15) and the left end surface of the pole tooth c (17) is distributed in a staggered manner with the magnetic fluid between the right end surface of the pole tooth b (16) and the left end surface of the pole tooth d (18) in the radial direction; the magnetic fluid between the left end face of the pole tooth e (19) and the right end face of the pole tooth g (21) is distributed in a staggered manner with the magnetic fluid between the left end face of the pole tooth f (20) and the right end face of the pole tooth h (22) in the radial direction;
the magnetic fluid between the right end face of the pole tooth i (25) and the left end face of the pole tooth j (27) is distributed in a staggered manner with the magnetic fluid between the right end face of the pole tooth k (26) and the left end face of the pole tooth l (28) in the radial direction; the magnetic fluid between the left end surface of the pole tooth m (29) and the pole tooth o (31) is distributed in a staggered manner with the magnetic fluid between the left end surface of the pole tooth n (30) and the right end surface of the pole tooth p (32) in the radial direction;
the magnetic fluid between the right end face of the pole tooth q (35) and the left end face of the pole tooth s (37) is distributed in a staggered manner with the magnetic fluid between the right end face of the pole tooth r (36) and the left end face of the pole tooth t (38) in the radial direction; and the magnetic fluid between the left end surface of the pole tooth u (39) and the right end surface of the pole tooth w (41) is distributed in a staggered manner with the magnetic fluid between the left end surface of the pole tooth v (40) and the right end surface of the pole tooth x (42) in the radial direction.
3. The divergent split-tooth stepped magnetic fluid rotary seal device according to claim 1, wherein:
1-5 pole teeth a (15) are arranged, and the pole teeth c (17) are arranged corresponding to the pole teeth a (15); 1-5 pole teeth b (16) are distributed, and the pole teeth d (18) are arranged corresponding to the pole teeth b (16);
1-5 pole teeth e (19) are arranged, and g (21) is arranged corresponding to the pole teeth e (19); 1-5 pole teeth f (20) are arranged, and the pole teeth h (22) are arranged corresponding to the pole teeth f (20);
1-5 pole teeth i (25) are arranged, and the pole teeth k (26) are arranged corresponding to the pole teeth i (25); 1-5 pole teeth j (27) are arranged, and the pole teeth l (28) are arranged corresponding to the pole teeth j (27);
1-5 pole teeth m (29) are arranged, and the pole teeth o (31) are arranged corresponding to the pole teeth m (29); 1-5 pole teeth n (30) are arranged, and the pole teeth p (32) are arranged corresponding to the pole teeth n (30);
1-5 pole teeth q (35) are arranged, and the pole teeth s (37) are arranged corresponding to the pole teeth q (35); 1-5 pole teeth r (36) are arranged, and the pole teeth t (38) are arranged corresponding to the pole teeth r (36);
1-5 pole teeth u (39) are arranged, and the pole teeth w (41) are arranged corresponding to the pole teeth u (39); the number of the pole teeth v (40) is 1-5, and the pole teeth x (42) are arranged corresponding to the pole teeth v (40).
4. The divergent split-tooth stepped magnetic fluid rotary seal device according to claim 1, wherein: the shaft (1) is made of a non-magnetic material.
5. The divergent split-tooth stepped magnetic fluid rotary seal device according to claim 1, wherein: the outer circular surfaces of the first pole shoe ring (3), the second pole shoe ring (4), the third pole shoe ring (5) and the fourth pole shoe ring (6) are provided with an annular groove I, and a sealing ring I (44) is arranged in the annular groove I.
6. The divergent split-tooth stepped magnetic fluid rotary seal device according to claim 1, wherein: the first permanent magnet ring (10), the second permanent magnet ring (11) and the third permanent magnet ring (12) are axial magnetizing permanent magnets; the magnetic force lines of the first permanent magnet ring (10) and the second permanent magnet ring (11) are opposite in direction, and the magnetic force lines of the first permanent magnet ring (10) and the third permanent magnet ring (12) are identical in direction.
7. The divergent split-tooth stepped magnetic fluid rotary seal device according to claim 1, wherein: the shaft is characterized by further comprising a left bearing sleeve (45), a right bearing sleeve (46), a left bearing (47) and a right bearing (48), wherein the left bearing sleeve (45) and the right bearing sleeve (46) are arranged on the inner wall of the shell (2), the left bearing sleeve (45) is positioned on the left side of the first pole shoe ring (3) and is in contact with the left end face of the first pole shoe ring (3), the left bearing (47) is arranged in the left bearing sleeve (45), the inner ring of the left bearing (47) is sleeved on the shaft (1), and the outer ring of the left bearing (47) is in contact with the inner ring of the left bearing sleeve (45); right bearing housing (46) be located fourth pole shoe ring (6) right side, with the right end face contact of fourth pole shoe ring (6), right bearing (48) locate right bearing housing (46) in, the inner circle suit of right bearing (48) is in axle (1), the outer lane of right bearing (48) and the inner circle contact of right bearing housing (46).
8. The divergent split-tooth stepped magnetic fluid rotary seal device according to claim 7, wherein: also comprises a left spacer bush (49) and a right spacer bush (50); an annular groove II is formed in the right end of the inner circular surface of the left bearing (47), the annular groove II is located on the right side of the left bearing (47), the left spacer bush (49) is arranged in the annular groove II, and the right end surface of the left spacer bush (49) is in contact with the left side wall of the first pole shoe ring (3); an annular groove III is formed in the right end of the inner circular surface of the right bearing (48), the annular groove III is located on the right side of the right bearing (48), the right spacer bush (50) is arranged in the annular groove III, and the right end face of the right spacer bush (50) is in contact with the right side wall of the fourth pole shoe ring (6).
9. The divergent split-tooth stepped magnetic fluid rotary seal device according to claim 8, wherein: and the outer circular surfaces of the left spacer bush (49) and the right spacer bush (50) are provided with an annular groove IV, and a sealing ring II (43) is arranged in the annular groove IV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911164988.4A CN110762224A (en) | 2019-11-25 | 2019-11-25 | Divergent split-tooth stepped magnetic fluid rotary sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911164988.4A CN110762224A (en) | 2019-11-25 | 2019-11-25 | Divergent split-tooth stepped magnetic fluid rotary sealing device |
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| Publication Number | Publication Date |
|---|---|
| CN110762224A true CN110762224A (en) | 2020-02-07 |
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|---|---|---|---|
| CN201911164988.4A Pending CN110762224A (en) | 2019-11-25 | 2019-11-25 | Divergent split-tooth stepped magnetic fluid rotary sealing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112387225A (en) * | 2020-10-30 | 2021-02-23 | 清华大学 | Composite magnetic medium sealing device for reaction kettle |
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2019
- 2019-11-25 CN CN201911164988.4A patent/CN110762224A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112387225A (en) * | 2020-10-30 | 2021-02-23 | 清华大学 | Composite magnetic medium sealing device for reaction kettle |
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