CN109764137B - Symmetrical double-step magnetic fluid sealing device - Google Patents
Symmetrical double-step magnetic fluid sealing device Download PDFInfo
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- CN109764137B CN109764137B CN201910095359.4A CN201910095359A CN109764137B CN 109764137 B CN109764137 B CN 109764137B CN 201910095359 A CN201910095359 A CN 201910095359A CN 109764137 B CN109764137 B CN 109764137B
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Abstract
The invention aims to provide a symmetrical double-step magnetic fluid sealing device which comprises a stepped shaft, a shell, a left pole shoe ring, a right pole shoe ring, a middle sleeve and a middle permanent magnet ring, wherein the left pole shoe ring is arranged on the left side of the shell; the stepped shaft comprises a 1-stage shaft with the largest diameter and more than two groups of secondary shafts with sequentially reduced diameters, wherein the secondary shafts are sequentially distributed to two sides along the side surface of the 1-stage shaft, and the middle radial section of the 1-stage shaft is used as a boundary and is bilaterally symmetrical. The invention aims to solve the problem of lower pressure resistance of the existing sealing device, so that the sealing technology is successfully applied to the fields of high speed, heavy load and the like.
Description
Technical Field
The invention belongs to the field of mechanical engineering sealing, and particularly relates to a symmetrical double-step magnetic fluid sealing device.
Background
In the magnetic fluid sealing occasion of the large-shaft-diameter rotating shaft, the pressure resistance of the magnetic fluid sealing is reduced due to the eccentricity caused by processing assembly errors, vibration and other factors; on the other hand, the sealing performance of the magnetic fluid is also reduced under the action of high-speed centrifugal force, so that the improvement of the pressure resistance of the dynamic sealing of the magnetic fluid with the large shaft diameter is one of the hot problems in the current research.
One of the methods of reducing the influence of the eccentricity of the rotating shaft on the pressure resistance of the magnetic fluid seal is by improving the magnetic fluid seal structure as a seal device described in comparative document 1 (patent publication No. CN105465373 a). Although the sealing device described in the above document has greatly improved sealing performance with respect to the conventional magnetic fluid, the sealing device does not consider the influence of the eccentricity of the rotating shaft on the sealing pressure resistance of the magnetic fluid.
Disclosure of Invention
The invention aims to provide a symmetrical double-step magnetic fluid sealing device, so that the problem that the pressure resistance of the magnetic fluid sealing device is reduced due to the eccentric and centrifugal force effects of a rotating shaft in the conventional sealing device is solved, and the sealing technology is successfully applied to occasions with large shaft diameter rotation.
The technical scheme of the invention is as follows:
the symmetrical double-step magnetic fluid sealing device comprises a step shaft, a shell, a left pole shoe ring, a right pole shoe ring, a middle sleeve and a middle permanent magnet ring;
the stepped shaft comprises a 1-level shaft with the largest diameter and more than two groups of secondary 1-level shafts with sequentially reduced diameters, wherein the secondary 1-level shafts are sequentially distributed to two sides along the side surface of the 1-level shaft, and the middle radial section of the 1-level shaft is used as a boundary and is bilaterally symmetrical;
the left pole shoe ring, the middle permanent magnet ring and the right pole shoe ring are sequentially sleeved on the inner wall of the shell, the right end face of the left pole shoe ring is contacted with the left end face of the middle permanent magnet ring, and the right end face of the middle permanent magnet ring is contacted with the left end face of the right pole shoe ring; the left pole shoe ring, the middle permanent magnet ring and the right pole shoe ring are arranged corresponding to the level 1 shaft, wherein the middle permanent magnet ring corresponds to the middle part of the level 1 shaft;
the middle sleeve is sleeved on the outer circular surface of the level 1 shaft, the outer circular surface of the middle sleeve corresponds to the inner circular surface of the middle permanent magnet ring, and a gap is reserved between the outer circular surface of the middle sleeve and the inner circular surface of the middle permanent magnet ring;
the outer side of the left end face of the middle sleeve is provided with a convex ring I; the middle part on the right end face of the left pole shoe ring is provided with an annular groove I, the left end face of the convex ring I extends leftwards along the axial direction to be close to the bottom face of the annular groove I, the bottom face of the annular groove I is provided with a pole tooth I, the pole tooth I extends rightwards along the axial direction, a gap is reserved between the pole tooth I and the left end face of the convex ring I, and magnetic fluid is arranged in the gap; the outer circular surface of the convex ring I is close to the outer side wall of the annular groove I, magnetic fluid is filled between the outer circular surface of the convex ring I and the outer side wall of the annular groove I, the inner circular surface of the convex ring I is close to the inner side wall of the annular groove I, and magnetic fluid is filled between the inner circular surface of the convex ring I and the inner side wall of the annular groove I;
the inner circular surface of the left pole shoe ring extends to the outer circular surface of the level 1 shaft along the radial direction, a gap is reserved between the inner circular surface of the left pole shoe ring and the outer circular surface of the level 1 shaft, a pole tooth VI is arranged on the inner circular surface of the left pole shoe ring, the pole tooth VI extends to the outer circular surface of the level 1 shaft along the radial direction, a gap is reserved between the pole tooth VI and the outer circular surface of the level 1 shaft, and magnetic fluid is arranged in the gap;
the part, located between the annular groove I and the level 1 shaft, of the right end face of the left pole shoe ring is provided with a pole tooth VII, the pole tooth VII extends towards the left end face of the middle sleeve along the axial direction, a gap is reserved between the pole tooth VII and the left end face of the middle sleeve, and magnetic fluid is arranged in the gap;
the outer side of the right end face of the middle sleeve is provided with a convex ring II; the middle part on the left end face of the right pole shoe ring is provided with an annular groove II, the right end face of the convex ring II extends to the right along the axial direction and is close to the bottom face of the annular groove II, the bottom face of the annular groove II is provided with a pole tooth II, the pole tooth II extends to the left along the axial direction, a gap is reserved between the pole tooth II and the right end face of the convex ring II, and magnetic fluid is arranged in the gap; the outer circular surface of the convex ring II is close to the outer side wall of the annular groove II, magnetic fluid is filled between the outer circular surface of the convex ring II and the outer side wall of the annular groove II, the inner circular surface of the convex ring II is close to the inner side wall of the annular groove II, and magnetic fluid is filled between the inner circular surface of the convex ring II and the inner side wall of the annular groove II;
the inner circular surface of the right pole shoe ring extends to the outer circular surface of the level 1 shaft along the radial direction, a gap is reserved between the inner circular surface of the right pole shoe ring and the outer circular surface of the level 1 shaft, a pole tooth VIII is arranged on the inner circular surface of the right pole shoe ring, the pole tooth VIII extends to the outer circular surface of the level 1 shaft along the radial direction, a gap is reserved between the pole tooth VIII and the outer circular surface of the level 1 shaft, and magnetic fluid is arranged in the gap;
the part of the left end face of the right pole shoe ring, which is positioned between the annular groove II and the level 1 shaft, is provided with a pole tooth IX, the pole tooth IX extends towards the right end face of the middle sleeve along the axial direction, a gap is reserved between the pole tooth IX and the right end face of the middle sleeve, and magnetic fluid is arranged in the gap.
The number of the teeth I is 1-10, the number of the teeth II is 1-10, the number of the teeth VI is 1-10, the number of the teeth VII is 1-10, the number of the teeth VIII is 1-10, and the number of the teeth IX is 1-10.
The outer circular surfaces of the left pole shoe ring and the right pole shoe ring are provided with annular grooves III, and sealing rings I are arranged in the annular grooves III.
The secondary shafts which are respectively and sequentially arranged at the left side and the right side of the 1-level shaft are 2-10-level shafts, and the diameters of the 1-level shaft and the 2-10-level shaft are sequentially reduced;
the device also comprises a left pole shoe ring, a right pole shoe ring, a left permanent magnet ring and a right permanent magnet ring;
the left pole shoe rings are provided with more than one group, are arranged on the inner wall of the shell at intervals and correspond to the 2-10-level shafts on the left side of the 1-level shaft, each group of left pole shoes correspond to the areas of two secondary shafts from right to left, a left permanent magnet ring is arranged between the left pole shoe ring closest to the middle sleeve and the middle sleeve, and a left permanent magnet ring is arranged between each group of left pole shoe rings;
the right pole shoe rings are arranged corresponding to the level-one shaft on the right side of the level-1 shaft, each set of right pole shoe rings corresponds to the areas of the two secondary shafts from left to right, a right permanent magnet ring is arranged between the right pole shoe ring closest to the middle sleeve and the middle sleeve, and a right permanent magnet ring is arranged between each set of right pole shoe rings;
the left pole shoe and the right pole shoe are respectively provided with a circular ring surface I, an end surface I, a circular ring surface II and an end surface II;
each end face I corresponds to the end face of the corresponding secondary shaft of the even number stage; the end face I is provided with a pole tooth III; the pole tooth III extends to the end face of the secondary shaft of each even-numbered stage along the axial direction, a gap is reserved between the pole tooth III and the end face of the secondary shaft of each even-numbered stage, and magnetic fluid is arranged in the gap;
the parts of the end surfaces II close to the stepped shafts correspond to the end surfaces of the secondary shafts of the previous odd-numbered stages respectively, and pole teeth IV are arranged on the parts of the end surfaces II close to the stepped shafts; the pole tooth IV extends to the end face of the secondary shaft of each odd-numbered stage along the axial direction, a gap is reserved between the pole tooth IV and the end face of the secondary shaft of each even-numbered stage, and magnetic fluid is arranged in the gap;
each annular surface I corresponds to the outer circular surface of the corresponding secondary shaft of the even level, a gap is reserved between the annular surface I and the outer circular surface of the secondary shaft of each even level, and magnetic fluid is arranged in the gap;
the ring surface II corresponds to the outer circumferential surface of the corresponding secondary shaft of the odd-numbered stage, the ring surface II is provided with pole teeth V, the pole teeth V extend to the outer circumferential surface of the secondary shaft of each odd-numbered stage along the radial direction, a gap is reserved between the pole teeth V and the outer circumferential surface of the secondary shaft of each odd-numbered stage, and magnetic fluid is arranged in the gap.
The number of the pole teeth III is 1-10, the number of the pole teeth IV is 1-10, and the number of the pole teeth V is 1-10.
The outer circular surfaces of the left pole shoe and the right pole shoe are provided with annular grooves IV, and sealing rings II are arranged in the annular grooves IV.
The left permanent magnet ring and the middle permanent magnet ring have opposite magnetic force lines, the right permanent magnet ring and the middle permanent magnet ring have opposite magnetic force lines, and the left permanent magnet ring and the right permanent magnet ring have the same magnetic force lines.
The symmetrical double-step magnetic fluid sealing device also comprises a right sleeve, wherein the right sleeve is arranged on the outer side of the rightmost right diode boot ring and is respectively contacted with the rightmost right diode boot ring and the end cover.
The symmetrical double-step magnetic fluid sealing device also comprises a left magnetism isolating ring, a right magnetism isolating ring, a left bearing and a right bearing; the left magnetism isolating ring is arranged at the left side of the leftmost left diode boot ring and is tightly attached to the inner wall of the shell; the right magnetism isolating ring is arranged on the right side of the rightmost right two-pole boot ring and is tightly attached to the inner circular surface of the right sleeve; the left bearing is sleeved on the left end of the stepped shaft and is positioned on the left side of the left magnetism isolating ring; the right bearing is arranged on the inner circular surface of the right sleeve and is positioned on the right side of the right magnetism isolating ring.
The magnetic fluid seal is to firmly fix the magnetic fluid in the sealing gap by utilizing the magnetic force generated by the permanent magnet in the sealing gap to resist the pressure difference at two sides, thereby achieving the sealing effect.
According to the invention, the T-shaped sleeve is added on the step of the stepped shaft and is in threaded connection with the shaft, then the T-shaped sleeve and the arcuate pole shoe form labyrinth seal, and the symmetrical double-step pole shoe is combined, and magnetic fluid is injected into the axial gap between the stepped shaft and the stepped pole shoe, so that the symmetrical double-step magnetic fluid seal is realized. The T-shaped sleeve is matched with the structure of the bow-shaped pole shoe, so that the sealing pressure-resistant capacity of the whole magnetic fluid sealing device is further enhanced.
The sealing device can better overcome the problem of the reduction of sealing performance of the existing sealing device caused by working conditions such as eccentricity, centrifugal force, large gap and the like, greatly reduces the loss of magnetic fluid when the sealing fails, reduces the influence of factors such as eccentricity and centrifugation on the sealing performance of magnetic fluid, improves the pressure resistance and the sealing reliability of common magnetic fluid sealing, and expands the safe working range of the common magnetic fluid sealing.
Drawings
FIG. 1 is a schematic view of a seal according to the present invention;
the numbers in the figures are marked and the corresponding names are as follows:
1-step shaft, 2-shell, 3-left one pole shoe ring, 4-left two pole shoe rings, 5-right one pole shoe ring, 6-right two pole shoe ring, 7-middle sleeve, 8-left permanent magnet ring, 9-middle permanent magnet ring, 10-right permanent magnet ring, 11-convex ring I, 12-annular groove I, 13-pole tooth I, 14-convex ring II, 15-annular groove II, 16-pole tooth II, 17-annular surface I, 18-end face I, 19-annular surface II, 20-end face II, 21-pole tooth III, 22-pole tooth IV, 23-pole tooth V, 24-annular groove III, 25-seal ring I, 26-annular groove IV, 27-seal ring II, 28-end cover, 29-left magnetism isolating ring, 30-right magnetism isolating ring, 31-left bearing, 32-right bearing, 33-right sleeve, 34-pole tooth VI, 35-pole tooth VII, 36-pole tooth VIII, 37-pole tooth IX.
101-1 level axis.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the device comprises a stepped shaft 1, a shell 2, a left pole shoe ring 3, a right pole shoe ring 5, a middle sleeve 7 and a middle permanent magnet ring 9;
the stepped shaft 1 comprises a 1-stage shaft 101 with the largest diameter and more than two groups of secondary shafts with sequentially reduced diameters, wherein the secondary shafts are sequentially distributed to two sides along the side surface of the 1-stage shaft 101, and are bilaterally symmetrical by taking the middle radial section of the 1-stage shaft 101 as a boundary;
the left pole shoe ring 3, the middle permanent magnet ring 9 and the right pole shoe ring 5 are sequentially sleeved on the inner wall of the shell 2, the right end face of the left pole shoe ring 3 is contacted with the left end face of the middle permanent magnet ring 9, and the right end face of the middle permanent magnet ring 9 is contacted with the left end face of the right pole shoe ring 5; the left pole shoe ring 3, the middle permanent magnet ring 9 and the right pole shoe ring 5 are arranged corresponding to the level 1 shaft 101, wherein the middle permanent magnet ring 9 corresponds to the middle part of the level 1 shaft 101;
the middle sleeve 7 is sleeved on the outer circular surface of the level 1 shaft 101, the outer circular surface of the middle sleeve 7 corresponds to the inner circular surface of the middle permanent magnet ring 9, and a gap is reserved between the middle sleeve and the inner circular surface of the middle permanent magnet ring 9;
the outer side of the left end face of the middle sleeve 7 is provided with a convex ring I11; the middle part on the right end face of the left pole shoe ring 3 is provided with an annular groove I12, the left end face of the convex ring I11 extends leftwards along the axial direction to be close to the bottom face of the annular groove I12, the bottom face of the annular groove I12 is provided with a pole tooth I13, the pole tooth I13 extends rightwards along the axial direction, a gap is reserved between the pole tooth I13 and the left end face of the convex ring I11, and magnetic fluid is arranged in the gap; the outer circular surface of the convex ring I11 is close to the outer side wall of the annular groove I12, magnetic fluid is filled between the outer circular surface of the convex ring I11 and the outer side wall of the annular groove I12, the inner circular surface of the convex ring I11 is close to the inner side wall of the annular groove I12, and magnetic fluid is filled between the inner circular surface of the convex ring I11 and the inner side wall of the annular groove I12;
the inner circular surface of the left pole shoe ring 3 extends to the outer circular surface of the level 1 shaft 101 along the radial direction, a gap is reserved between the inner circular surface of the left pole shoe ring 3 and the outer circular surface of the level 1 shaft 101, the inner circular surface of the left pole shoe ring 3 is provided with pole teeth VI 34, the pole teeth VI 34 extend to the outer circular surface of the level 1 shaft 101 along the radial direction, a gap is reserved between the pole teeth VI 34 and the outer circular surface of the level 1 shaft 101, and magnetic fluid is arranged in the gap;
the part, located between the annular groove I12 and the level 1 shaft 101, of the right end face of the left pole shoe ring 3 is provided with a pole tooth VII 35, the pole tooth VII 35 extends towards the left end face of the middle sleeve 7 along the axial direction, a gap is reserved between the pole tooth VII 35 and the left end face of the middle sleeve 7, and magnetic fluid is arranged in the gap;
the outer side of the right end face of the middle sleeve 7 is provided with a convex ring II14; the middle part on the left end face of the right pole shoe ring 5 is provided with an annular groove II15, the right end face of the convex ring II14 extends to the right along the axial direction and is close to the bottom face of the annular groove II15, the bottom face of the annular groove II15 is provided with a pole tooth II16, the pole tooth II16 extends to the left along the axial direction, a gap is reserved between the pole tooth II16 and the right end face of the convex ring II14, and magnetic fluid is arranged in the gap; the outer circular surface of the convex ring II14 is close to the outer side wall of the annular groove II15, magnetic fluid is filled between the outer circular surface of the convex ring II14 and the outer side wall of the annular groove II15, the inner circular surface of the convex ring II14 is close to the inner side wall of the annular groove II15, and magnetic fluid is filled between the inner circular surface of the convex ring II14 and the inner side wall of the annular groove II 15;
the inner circular surface of the right pole shoe ring 5 extends to the outer circular surface of the level 1 shaft 101 along the radial direction, a gap is reserved between the inner circular surface of the right pole shoe ring 5 and the outer circular surface of the level 1 shaft 101, the inner circular surface of the right pole shoe ring 5 is provided with pole teeth VIII 36, the pole teeth VIII 36 extend to the outer circular surface of the level 1 shaft 101 along the radial direction, a gap is reserved between the pole teeth VIII 36 and the outer circular surface of the level 1 shaft 101, and magnetic fluid is arranged in the gap;
the part of the left end face of the right pole shoe ring 5, which is positioned between the annular groove II15 and the level 1 shaft 101, is provided with pole teeth IX 37, the pole teeth IX 37 extend towards the right end face of the middle sleeve 7 along the axial direction, a gap is reserved between the pole teeth IX 37 and the right end face of the middle sleeve 7, and magnetic fluid is arranged in the gap.
1-10 teeth I13 are arranged at intervals, 1-10 teeth II16 are arranged at intervals, 1-10 teeth VI 34 are arranged at intervals, 1-10 teeth VII 35 are arranged at intervals, 1-10 teeth VIII 36 are arranged at intervals, and 1-10 teeth IX 37 are arranged at intervals.
The outer circular surfaces of the left pole shoe ring 3 and the right pole shoe ring 5 are provided with annular grooves III24, and sealing rings III25 are arranged in the annular grooves I24.
The secondary shafts respectively and sequentially arranged at the left side and the right side of the 1-stage shaft 101 are 2-10-stage shafts, and the diameters of the 1-stage shaft 101 and the 2-10-stage shaft are sequentially reduced;
the device also comprises a left two pole shoe ring 4, a right two pole shoe ring 6, a left permanent magnet ring 8 and a right permanent magnet ring 10;
the left pole shoe rings 4 are provided with more than one group, are arranged on the inner wall of the shell 2 at intervals and correspond to the 2-10-level shafts on the left side of the 1-level shaft 101, each group of the left pole shoe rings 4 corresponds to the areas of two secondary shafts from right to left, a left permanent magnet ring 8 is arranged between the left pole shoe ring 4 closest to the middle sleeve 7 and the middle sleeve 7, and a left permanent magnet ring 8 is arranged between each group of the left pole shoe rings 4;
the right two pole shoe rings 6 are arranged corresponding to the 2-10 level shafts on the right side of the 1 level shaft 101, each group of right two pole shoe rings 6 corresponds to the areas of two secondary shafts from left to right, a right permanent magnet ring 10 is arranged between the right two pole shoe ring 6 closest to the middle sleeve 7 and the middle sleeve 7, and a right permanent magnet ring 10 is arranged between each group of right two pole shoe rings 6;
the left diode shoe 4 and the right pole shoe ring 6 are respectively provided with a circular ring surface I17, an end surface I18, a circular ring surface II19 and an end surface II20;
each end face I18 corresponds to the end face of the corresponding secondary shaft of the even number stage; the end face I18 is provided with a pole tooth III21; the pole tooth III21 extends to the end face of the secondary shaft of each even-numbered stage along the axial direction, a gap is reserved between the pole tooth III and the end face of the secondary shaft of each even-numbered stage, and magnetic fluid is arranged in the gap;
the parts of the end surfaces II20 close to the stepped shaft 1 correspond to the end surfaces of the secondary shafts of the previous odd-numbered stages respectively, and the parts of the end surfaces II20 close to the stepped shaft 1 are provided with pole teeth IV 22; the pole tooth IV 22 extends to the end face of the secondary shaft of each odd-numbered stage along the axial direction, a gap is reserved between the pole tooth IV 22 and the end face of the secondary shaft of each even-numbered stage, and magnetic fluid is arranged in the gap;
each annular surface I17 corresponds to the outer circular surface of the corresponding secondary shaft of the even level, a gap is reserved between the annular surface I17 and the outer circular surface of the secondary shaft of each even level, and magnetic fluid is arranged in the gap;
the ring surface II19 corresponds to the outer circumferential surface of the corresponding odd-numbered secondary shaft, the ring surface II19 is provided with pole teeth V23, the pole teeth V23 extend radially to the outer circumferential surface of each odd-numbered secondary shaft, a gap is reserved between the pole teeth V23 and the outer circumferential surface of each odd-numbered secondary shaft, and magnetic fluid is arranged in the gap.
1-10 pole teeth III21 are arranged at intervals, and 1-10 pole teeth IV 22 are arranged at intervals; the number of the pole teeth V23 is 1-10 at intervals.
The outer circular surfaces of the left diode boot 4 and the right diode boot ring 6 are provided with annular grooves IV 26, and sealing rings IV 27 are arranged in the annular grooves II 26.
The left permanent magnet ring 8 and the middle permanent magnet ring 9 have opposite magnetic force lines, the right permanent magnet ring 10 and the middle permanent magnet ring 9 have opposite magnetic force lines, and the left permanent magnet ring 8 and the right permanent magnet ring 10 have the same magnetic force lines.
The symmetrical double-step magnetic fluid sealing device also comprises a right sleeve 33, wherein the right sleeve 33 is arranged on the outer side of the rightmost right diode boot ring 6 and is respectively contacted with the rightmost right diode boot ring 6 and the end cover 28.
The symmetrical double-step magnetic fluid sealing device also comprises a left magnetism isolating ring 29, a right magnetism isolating ring 30, a left bearing 31 and a right bearing 32; the left magnetism isolating ring 29 is arranged at the left side of the leftmost left two pole shoe rings 4 and is closely attached to the inner wall of the shell 2; the right magnetism isolating ring 30 is arranged on the right side of the rightmost right diode boot ring 6 and is tightly attached to the inner circular surface of the right sleeve 33; the left bearing 31 is sleeved on the left end of the stepped shaft 1 and is positioned on the left side of the left magnetism isolating ring 29; the right bearing 32 is arranged on the inner circular surface of the right sleeve 33 and is positioned on the right side of the right magnetism isolating ring 30.
Claims (7)
1. The utility model provides a symmetrical double-step magnetic fluid sealing device, includes step shaft (1), shell (2), a left pole shoe ring (3), a right pole shoe ring (5), middle sleeve (7), middle permanent magnet ring (9), its characterized in that:
the stepped shaft (1) comprises a 1-stage shaft (101) with the largest diameter and more than two groups of secondary shafts with sequentially reduced diameters, wherein the secondary shafts are sequentially distributed to two sides along the side surface of the 1-stage shaft (101), and the middle radial section of the 1-stage shaft (101) is used as a boundary and is bilaterally symmetrical;
the left pole shoe ring (3), the middle permanent magnet ring (9) and the right pole shoe ring (5) are sequentially sleeved on the inner wall of the shell (2), the right end face of the left pole shoe ring (3) is contacted with the left end face of the middle permanent magnet ring (9), and the right end face of the middle permanent magnet ring (9) is contacted with the left end face of the right pole shoe ring (5); the left pole shoe ring (3), the middle permanent magnet ring (9) and the right pole shoe ring (5) are arranged corresponding to the level 1 shaft (101), wherein the middle permanent magnet ring (9) corresponds to the middle part of the level 1 shaft (101);
the middle sleeve (7) is sleeved on the outer circular surface of the level 1 shaft (101), the outer circular surface of the middle sleeve (7) corresponds to the inner circular surface of the middle permanent magnet ring (9), and a gap is reserved between the middle sleeve and the inner circular surface of the middle permanent magnet ring;
the outer side of the left end face of the middle sleeve (7) is provided with a convex ring I (11); the middle part on the right end face of the left pole shoe ring (3) is provided with an annular groove I (12), the left end face of the convex ring I (11) axially extends leftwards to be close to the bottom face of the annular groove I (12), the bottom face of the annular groove I (12) is provided with a pole tooth I (13), the pole tooth I (13) axially extends rightwards, a gap is reserved between the pole tooth I (13) and the left end face of the convex ring I (11), and magnetic fluid is arranged in the gap; the outer circular surface of the convex ring I (11) is close to the outer side wall of the annular groove I (12), magnetic fluid is filled between the outer circular surface of the convex ring I (11) and the outer side wall of the annular groove I (12), the inner circular surface of the convex ring I (11) is close to the inner side wall of the annular groove I (12), and magnetic fluid is filled between the inner circular surface of the convex ring I (11) and the inner side wall of the annular groove I (12);
the inner circular surface of the left pole shoe ring (3) extends to the outer circular surface of the level 1 shaft (101) along the radial direction, a gap is reserved between the inner circular surface of the left pole shoe ring (3) and the outer circular surface of the level 1 shaft (101), the inner circular surface of the left pole shoe ring (3) is provided with a pole tooth VI (34), the pole tooth VI (34) extends to the outer circular surface of the level 1 shaft (101) along the radial direction, a gap is reserved between the pole tooth VI and the outer circular surface of the level 1 shaft (101), and magnetic fluid is arranged in the gap;
a pole tooth VII (35) is arranged at the part, located between the annular groove I (12) and the level 1 shaft (101), on the right end face of the left pole shoe ring (3), the pole tooth VII (35) extends towards the left end face of the middle sleeve (7) along the axial direction, a gap is reserved between the pole tooth VII (35) and the left end face of the middle sleeve (7), and magnetic fluid is arranged in the gap;
the outer side of the right end face of the middle sleeve (7) is provided with a convex ring II (14); the middle part on the left end face of the right pole shoe ring (5) is provided with an annular groove II (15), the right end face of the convex ring II (14) extends to the right along the axial direction and is close to the bottom face of the annular groove II (15), the bottom face of the annular groove II (15) is provided with a pole tooth II (16), the pole tooth II (16) extends to the left along the axial direction, a gap is reserved between the pole tooth II and the right end face of the convex ring II (14), and magnetic fluid is arranged in the gap; the outer circular surface of the convex ring II (14) is close to the outer side wall of the annular groove II (15), magnetic fluid is filled between the outer circular surface of the convex ring II (14) and the outer side wall of the annular groove II (15), the inner circular surface of the convex ring II (14) is close to the inner side wall of the annular groove II (15), and magnetic fluid is filled between the inner circular surface of the convex ring II (14) and the inner side wall of the annular groove II (15);
the inner circular surface of the right pole shoe ring (5) extends to the outer circular surface of the level 1 shaft (101) along the radial direction, a gap is reserved between the inner circular surface of the right pole shoe ring (5) and the outer circular surface of the level 1 shaft (101), the inner circular surface of the right pole shoe ring (5) is provided with pole teeth VIII (36), the pole teeth VIII (36) extend to the outer circular surface of the level 1 shaft (101) along the radial direction, a gap is reserved between the pole teeth VIII (36) and the outer circular surface of the level 1 shaft (101), and magnetic fluid is arranged in the gap;
the part, located between the annular groove II (15) and the level 1 shaft (101), of the left end face of the right pole shoe ring (5) is provided with pole teeth IX (37), the pole teeth IX (37) extend towards the right end face of the middle sleeve (7) along the axial direction, a gap is reserved between the pole teeth IX (37) and the right end face of the middle sleeve (7), and magnetic fluid is arranged in the gap;
1-10 teeth I (13) are arranged at intervals, 1-10 teeth II (16) are arranged at intervals, 1-10 teeth VI (34) are arranged at intervals, 1-10 teeth VII (35) are arranged at intervals, 1-10 teeth VIII (36) are arranged at intervals, and 1-10 teeth IX (37) are arranged at intervals;
the outer circular surfaces of the left pole shoe ring (3) and the right pole shoe ring (5) are provided with annular grooves III (24), and sealing rings I (25) are arranged in the annular grooves III (24).
2. A symmetrical double-step magnetic fluid seal as defined in claim 1, wherein:
the secondary shafts which are respectively and sequentially arranged on the left side and the right side of the 1-level shaft (101) are 2-10-level shafts, and the diameters of the 1-level shaft (101) and the 2-10-level shaft are sequentially reduced;
the permanent magnet assembly also comprises a left two-pole shoe ring (4), a right two-pole shoe ring (6), a left permanent magnet ring (8) and a right permanent magnet ring (10);
the left two pole shoe rings (4) are provided with more than one group, are arranged on the inner wall of the shell (2) at intervals, are arranged corresponding to the 2-10-level shafts on the left side of the 1-level shaft (101), and correspond to the areas of two secondary shafts from right to left, a left permanent magnet ring (8) is arranged between the left two pole shoe rings (4) closest to the middle sleeve (7) and the middle sleeve (7), and a left permanent magnet ring (8) is arranged between the left two pole shoe rings (4) of each group;
the right two pole shoe rings (6) are arranged corresponding to the 2-10 level shafts on the right side of the 1 level shaft (101), each group of right two pole shoe rings (6) corresponds to the areas of two secondary shafts from left to right, a right permanent magnet ring (10) is arranged between the right two pole shoe ring (6) closest to the middle sleeve (7) and the middle sleeve (7), and a right permanent magnet ring (10) is arranged between each group of right two pole shoe rings (6);
the left diode boot ring (4) and the right pole shoe ring (6) are respectively provided with a circular ring surface I (17), an end surface I (18), a circular ring surface II (19) and an end surface II (20);
each end face I (18) corresponds to the end face of the corresponding secondary shaft of the even number stage; the end face I (18) is provided with a pole tooth III (21); the pole teeth III (21) extend towards the end faces of the secondary shafts of all even stages along the axial direction, gaps are reserved between the pole teeth III and the end faces of the secondary shafts of all even stages, and magnetic fluid is arranged in the gaps;
the parts of the end faces II (20) close to the stepped shaft (1) correspond to the end faces of the secondary shafts of the previous odd stages respectively, and pole teeth IV (22) are arranged on the parts of the end faces II (20) close to the stepped shaft (1); the pole tooth IV (22) extends to the end face of the secondary shaft of each odd-numbered stage along the axial direction, a gap is reserved between the pole tooth IV and the end face of the secondary shaft of each even-numbered stage, and magnetic fluid is arranged in the gap;
each annular surface I (17) corresponds to the outer circular surface of the corresponding secondary shaft of the even level, a gap is reserved between the annular surface I (17) and the outer circular surface of the secondary shaft of each even level, and magnetic fluid is arranged in the gap;
the ring surface II (19) corresponds to the outer circumferential surface of the corresponding odd-level secondary shaft, the ring surface II (19) is provided with pole teeth V (23), the pole teeth V (23) extend to the outer circumferential surface of each odd-level secondary shaft along the radial direction, gaps are reserved between the pole teeth V and the outer circumferential surface of each odd-level secondary shaft, and magnetic fluid is arranged in the gaps.
3. A symmetrical double-step magnetic fluid seal as claimed in claim 2, wherein: 1-10 pole teeth III (21) are arranged at intervals, 1-10 pole teeth IV (22) are arranged at intervals, and 1-10 pole teeth V (23) are arranged at intervals.
4. A symmetrical double-step magnetic fluid seal as claimed in claim 2, wherein: the outer circular surfaces of the left pole shoe ring (4) and the right pole shoe ring (6) are provided with annular grooves IV (26), and sealing rings II (27) are arranged in the annular grooves IV (26).
5. A symmetrical double-step magnetic fluid seal as claimed in claim 2, wherein: the left permanent magnet ring (8) and the middle permanent magnet ring (9) have opposite magnetic force lines, the right permanent magnet ring (10) and the middle permanent magnet ring (9) have opposite magnetic force lines, and the left permanent magnet ring (8) and the right permanent magnet ring (10) have the same magnetic force lines.
6. A symmetrical double-step magnetic fluid seal as claimed in claim 2, wherein: the right sleeve (33) is arranged on the outer side of the rightmost right pole shoe ring (6) and is respectively contacted with the rightmost right pole shoe ring (6) and the end cover (28).
7. A symmetrical double-step magnetic fluid seal as defined in claim 6 wherein: the device also comprises a left magnetism isolating ring (29), a right magnetism isolating ring (30), a left bearing (31) and a right bearing (32); the left magnetism isolating ring (29) is arranged at the left side of the leftmost left diode boot ring (4) and is tightly attached to the inner wall of the shell (2); the right magnetism isolating ring (30) is arranged on the right side of the rightmost right pole shoe ring (6) and is tightly attached to the inner circular surface of the right sleeve (33); the left bearing (31) is sleeved on the left end of the stepped shaft (1) and is positioned on the left side of the left magnetism isolating ring (29); the right bearing (32) is arranged on the inner circular surface of the right sleeve (33) and is positioned on the right side of the right magnetism isolating ring (30).
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| CN201910095359.4A CN109764137B (en) | 2019-01-31 | 2019-01-31 | Symmetrical double-step magnetic fluid sealing device |
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| CN201910095359.4A CN109764137B (en) | 2019-01-31 | 2019-01-31 | Symmetrical double-step magnetic fluid sealing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113074255B (en) * | 2021-04-29 | 2021-12-07 | 清华大学 | Magnetic liquid sealing device |
| CN113494608B (en) * | 2021-08-02 | 2022-07-22 | 北京交通大学 | Magnetic liquid sealing device capable of resisting axial and radial vibration |
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