CN108799506B - Multi-magnetic source symmetrical magnetic fluid sealing device - Google Patents

Abstract

The present invention relates to a multi-magnetic source symmetric magnetic fluid sealing device, including the multi-magnetic source symmetric magnetic fluid sealing device, which is composed of more than one magnetic fluid sealing unit, and the magnetic fluid sealing unit includes a housing, a left Pole shoe ring I, left pole shoe ring II, middle pole shoe ring I, middle pole shoe ring II, right pole shoe ring I, right pole shoe ring II, permanent magnet ring I, permanent magnet ring II. The object of the present invention is to solve the problem of low pressure resistance existing in the existing sealing device, so that the sealing technology can be successfully applied in the fields of high speed and heavy load.

Description

A multi-magnetic source symmetrical magnetic fluid sealing device

technical field

The invention belongs to the field of mechanical engineering sealing, and in particular relates to a multi-magnetic source symmetrical magnetic fluid sealing device.

Background technique

When the magnetic fluid sealing technology is applied in the high-speed and heavy-duty sealing environment, the loss of the magnetic fluid reduces the pressure resistance of the sealing device, and the magnetic fluid in the sealing gap often fails because the sealing gap is too large, so the improvement of the large-gap magnetic fluid The pressure resistance performance of the seal is one of the hot issues in current research.

One of the methods to improve the pressure resistance performance of magnetic fluid seals under large gaps is to improve the magnetic fluid seal structure, such as the sealing device described in reference 1 (the patent publication number is CN 103115152A). Although the sealing device described in the above literature has greatly improved the sealing performance compared with ordinary magnetic fluid, its sealing performance still cannot meet the high sealing performance requirements of special working conditions such as high speed and heavy load.

Contents of the invention

The purpose of the present invention is to provide a multi-magnetic source symmetric magnetic fluid sealing device, so as to solve the problem of low pressure resistance existing in the existing sealing device, so that the sealing technology can be successfully applied in the fields of high speed and heavy load.

Technical scheme of the present invention is as follows:

The multi-magnetic source symmetric magnetic fluid sealing device includes a housing, which is composed of more than one magnetic fluid sealing unit, and the magnetic fluid sealing unit includes a left pole shoe ring I, a left pole shoe ring II, a middle pole shoe ring I. Middle pole shoe ring II, right pole shoe ring I, right pole shoe ring II, permanent magnet ring I, permanent magnet ring II;

The left pole shoe ring I, the middle pole shoe ring I, and the right pole shoe ring I are set on the shaft at intervals, and a permanent Magnet ring 1, the permanent magnet ring 1 is sleeved on the shaft;

The left pole shoe ring II, the middle pole shoe ring II, and the right pole shoe ring II are arranged on the inner wall of the housing, and the left pole shoe ring II, the middle pole shoe ring II, and the right pole shoe ring II are arranged between There is a permanent magnet ring II, and the right pole shoe ring II is arranged on the inner wall of the shell;

The radial height of the left pole shoe ring I and the right pole shoe ring I is the same as the radial height of the permanent magnet ring I, and the radial height of the middle pole shoe ring I is higher than the radial height of the permanent magnet ring I. Height; the radial height of the middle pole shoe ring II is higher than the radial height of the permanent magnet ring II, and the radial heights of the left pole shoe ring II and the right pole shoe ring II are higher than the middle pole shoe ring II radial height;

The axial length of the left pole shoe ring II is greater than the axial length of the left pole shoe ring I, and less than the sum of the axial lengths of the left pole shoe ring I and the permanent magnet ring I; the axial length of the right pole shoe ring II The axial length is greater than the axial length of the right pole shoe ring I and less than the sum of the axial lengths of the right pole shoe ring I and the permanent magnet ring II; the axial length of the middle pole shoe ring I is greater than that of the middle pole shoe ring II the axial length of

The inner surface of the left pole shoe ring II is provided with pole teeth I on the part corresponding to the outer surface of the left pole shoe ring I, and the pole teeth I extend radially toward the outer surface of the left pole shoe ring I. , there is a gap between the outer surface of the left pole shoe ring I, and the gap is filled with magnetic fluid for sealing;

The part of the inner circle of the right pole shoe ring II corresponding to the outer circle of the right pole shoe ring I is provided with pole teeth II, and the pole teeth II extend radially toward the outer circle of the right pole shoe ring I, There is a gap with the outer surface of the right pole shoe ring I, and the gap is filled with magnetic fluid for sealing;

The pole teeth III are arranged on the inner surface of the middle pole shoe ring II, and the pole teeth III extend radially toward the outer circle surface of the middle pole shoe ring I, and between the outer circle surface of the middle pole shoe ring I A gap is left, and the gap is filled with magnetic fluid for sealing.

There are 1-5 groups of magnetic fluid sealing units arranged along the axial direction of the shaft.

The number of pole teeth I set on the inner circle of the left pole shoe ring II is 1-5; the number of pole teeth II set on the inner circle of the right pole shoe ring II is 1-5.

The number of pole teeth III arranged on the inner surface of the middle pole shoe ring II is 2-10.

The size of the gap between the pole tooth I1 and the outer surface of the left pole shoe ring I is 0.05-3mm; the size of the gap between the described pole tooth II and the outer circle surface of the right pole shoe ring I is 0.05-3mm; The size of the gap between the pole tooth III and the outer surface of the middle pole shoe ring I is 0.05-3 mm.

Both the permanent magnet ring I and the permanent magnet ring II are axially magnetized permanent magnets.

In the multi-magnetic source symmetric magnetic fluid sealing device, the direction of the magnetic force lines between two adjacent permanent magnet rings I is opposite; the direction of the magnetic force lines between two adjacent permanent magnet rings II is opposite; each magnetic fluid seal In the unit, the directions of the magnetic force lines of the permanent magnet ring I and the permanent magnet ring II on the left are opposite, and the magnetic force lines of the permanent magnet ring I and the permanent magnet ring II on the right are opposite.

Grooves are provided on the outer circular surfaces of the left pole shoe ring II and the right pole shoe ring II, and sealing rings are provided in the grooves.

The multi-magnetic source symmetrical magnetic fluid sealing device also includes a left magnetic isolation ring, a left second magnetic isolation ring, a right magnetic isolation ring, and a right second magnetic isolation ring; the left magnetic isolation ring and the right The magnetic spacer ring is set on the shaft, the left magnetic spacer ring is located on the left side of the left pole shoe ring I, and the right magnetic spacer ring is located on the right side of the right pole shoe ring I; the left two magnetic spacers and the right two The magnetic isolation rings are arranged on the inner wall of the housing, the left two magnetic isolation rings are located on the left side of the left pole shoe ring II, and the right second magnetic isolation rings are located on the right side of the right pole shoe ring II.

The multi-magnetic source symmetric magnetic fluid sealing device also includes a left bearing and a right bearing; the left bearing and the right bearing are respectively set on the shaft, and the left bearing is arranged on the left first magnetic ring and the left second magnetic ring. The left side of the magnetic ring is in contact with the first magnetic ring on the left and the second magnetic ring on the left; The second magnetic ring on the right is in contact.

In the present invention, by designing a symmetrical pole piece, the pole teeth on the pole piece are designed in the radial direction, and magnetic fluid is injected into the radial sealing gap formed between different pole pieces, thereby realizing a multi-magnetic source symmetry Type magnetic fluid seal device.

The present invention passes between the left pole shoe ring I, the right pole shoe ring I, the permanent magnet ring I, the middle pole shoe ring I, the middle pole shoe ring II, the permanent magnet ring II, the left pole shoe ring II, and the right pole shoe ring II radial height relationship. And left pole shoe ring II, left pole shoe ring I, permanent magnet ring I, right pole shoe ring II, right pole shoe ring I, permanent magnet ring II, middle pole shoe ring I, middle pole shoe ring II The axial length relationship forms a three-dimensional structure, which can help reduce magnetic flux leakage and increase the magnetic energy product of the magnetic circuit; and the middle pole shoe ring I and the middle pole shoe ring II can also be connected with the adjacent permanent magnet ring , The pole shoe ring forms a short magnetic fluid sealing circuit, which improves the pressure resistance and reliability of the magnetic fluid seal, and also improves the self-repairing ability of the magnetic fluid sealing device.

The invention overcomes the problem that the existing sealing device cannot meet the high sealing performance requirements of special working conditions such as high speed and heavy load, and adopts a multi-magnetic source symmetrical structure design, which increases the magnetic flux in the magnetic circuit and reduces the loss of magnetic fluid when the seal fails. The pressure resistance and sealing reliability of the magnetic fluid seal under the condition of large gap are improved, and its safe working range is expanded. At the same time, a non-magnetic shaft can be used to further increase the magnetic flux in the magnetic circuit and reduce the loss of magnetic fluid when the seal fails.

Description of drawings

Fig. 1 is a structural schematic diagram of a multi-magnetic source symmetrical magnetic fluid sealing device provided by an embodiment of the present invention;

The serial numbers and corresponding names in the figure are as follows:

1-shaft, 2-housing, 3-left pole shoe ring I, 4-left pole shoe ring II, 5-middle pole shoe ring I, 6-middle pole shoe ring II, 7-right pole shoe ring I, 8- Right pole shoe ring II, 9-permanent magnet ring I, 10-permanent magnet ring II, 11-pole tooth I, 12-pole tooth II, 13-pole tooth III, 14-sealing ring, 15-left magnetic ring , 16-left two magnetic rings, 17-right one magnetic ring, 18-right two magnetic rings, 19-left bearing, 20-right bearing.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

As shown in Figure 1, the multi-magnetic source symmetric magnetic fluid sealing device includes a housing 2, which is composed of more than one magnetic fluid sealing unit, and the magnetic fluid sealing unit includes a left pole shoe ring I3, a left pole shoe Ring II4, middle pole shoe ring I5, middle pole shoe ring II6, right pole shoe ring I7, right pole shoe ring II8, permanent magnet ring I9, permanent magnet ring II10;

The left pole shoe ring I3, the middle pole shoe ring I5, and the right pole shoe ring I7 are set on the shaft 1 at intervals, and the left pole shoe ring I3, the middle pole shoe ring I5 and the right pole shoe ring I7 are provided with A permanent magnet ring I9, the permanent magnet ring I9 is sleeved on the shaft 1;

The left pole shoe ring II4, the middle pole shoe ring II6, and the right pole shoe ring II8 are arranged on the inner wall of the housing 2, and between the left pole shoe ring II4, the middle pole shoe ring II6, and the right pole shoe ring II8 A permanent magnet ring II10 is provided, and the right pole shoe ring II8 is arranged on the inner wall of the housing 2;

The radial height of the left pole shoe ring I3 and the right pole shoe ring I7 is the same as the radial height of the permanent magnet ring I9, and the radial height of the middle pole shoe ring I5 is higher than the radial height of the permanent magnet ring I9. Height; the radial height of the middle pole shoe ring II6 is higher than the radial height of the permanent magnet ring II10, and the radial height of the left pole shoe ring II4 and the right pole shoe ring II8 is higher than that of the middle pole shoe ring II6 radial height;

The axial length of the left pole shoe ring II4 is greater than the axial length of the left pole shoe ring I3, and less than the sum of the axial lengths of the left pole shoe ring I3 and the permanent magnet ring I9; the axial length of the right pole shoe ring II8 The axial length is greater than the axial length of the right pole shoe ring I7, and less than the sum of the axial lengths of the right pole shoe ring I7 and the permanent magnet ring II10; the axial length of the middle pole shoe ring I5 is greater than that of the middle pole shoe ring II6 the axial length of

The inner circle of the left pole shoe ring II4 is provided with pole teeth I11 on the part corresponding to the outer circle of the left pole shoe ring I3, and the pole teeth I11 extend radially toward the outer circle of the left pole shoe ring I3 , there is a gap between the outer surface of the left pole shoe ring I3, and the gap is filled with magnetic fluid for sealing;

The part of the inner circle of the right pole shoe ring II8 corresponding to the outer circle of the right pole shoe ring I7 is provided with pole teeth II12, and the pole teeth II12 extend radially toward the outer circle of the right pole shoe ring I7, There is a gap between the outer surface of the right pole shoe ring I7, and the gap is filled with magnetic fluid for sealing;

The pole teeth III13 are arranged on the inner surface of the middle pole shoe ring II6, and the pole teeth III13 extend radially toward the outer circle surface of the middle pole shoe ring I5, and between the outer circle surface of the middle pole shoe ring I5 A gap is left, and the gap is filled with magnetic fluid for sealing.

There are 1-5 groups of the magnetic fluid sealing units arranged along the axial direction of the shaft 1 .

The number of pole teeth I11 set on the inner circle of the left pole shoe ring II4 is 1-5; the number of pole teeth II12 set on the inner circle of the right pole shoe ring II8 is 1-5.

The number of pole teeth III13 provided on the inner surface of the middle pole shoe ring II6 is 2-10.

The size of the gap between the pole tooth I11 and the outer surface of the left pole shoe ring I3 is 0.05-3mm; the size of the gap between the pole tooth II12 and the outer circle surface of the right pole shoe ring I7 is 0.05-3mm; The size of the gap between the pole teeth III13 and the outer surface of the middle pole shoe ring I5 is 0.05-3mm.

Both the permanent magnet ring I9 and the permanent magnet ring II10 are axially magnetized permanent magnets.

In the multi-magnetic source symmetric magnetic fluid sealing device, the direction of the magnetic force lines between two adjacent permanent magnet rings I9 is opposite; the direction of the magnetic force lines between two adjacent permanent magnet rings II10 is opposite; each magnetic fluid seal In the unit, the directions of the magnetic force lines of the permanent magnet ring I5 and the permanent magnet ring II6 on the left are opposite, and the magnetic force lines of the permanent magnet ring I5 and the permanent magnet ring II6 on the right are opposite.

Grooves are provided on the outer circular surfaces of the left pole shoe ring II4 and the right pole shoe ring II8, and sealing rings 14 are arranged in the grooves.

The multi-magnetic source symmetrical magnetic fluid sealing device also includes a left magnetic isolation ring 15, a left second magnetic isolation ring 16, a right magnetic isolation ring 17, and a right second magnetic isolation ring 18; The ring 15 and the right magnetic isolation ring 17 are sleeved on the shaft 1, the left magnetic isolation ring 18 is located on the left side of the left pole shoe ring I3, and the right magnetic isolation ring 17 is located on the right side of the right pole shoe ring I7; The second left magnetic ring 16 and the right second magnetic ring 18 are arranged on the inner wall of the housing 2, the left second magnetic ring 16 is located on the left side of the left pole shoe ring II4, and the right second magnetic ring 18 is located on the right pole shoe ring Right side of II8.

The multi-magnetic source symmetrical magnetic fluid sealing device also includes a left bearing 19 and a right bearing 20; the left bearing 19 and the right bearing 20 are respectively sleeved on the shaft 1, and the left bearing 19 is arranged on the left one The magnetic isolation ring 15, the left two magnetic isolation rings 16 left sides are in contact with the left magnetic isolation ring 15 and the left second magnetic isolation ring 16 respectively; The right side of the ring 18 is in contact with the first right magnetic isolation ring 17 and the second right magnetic isolation ring 18 respectively.

Claims (8)

1. A multi-magnetic source symmetrical magnetic fluid sealing device, including a housing (2), characterized in that: Consists of more than one magnetic fluid sealing unit, the magnetic fluid sealing unit includes left pole shoe ring I (3), left pole shoe ring II (4), middle pole shoe ring I (5), middle pole shoe ring II (6), right pole shoe ring I (7), right pole shoe ring II (8), permanent magnet ring I (9), permanent magnet ring II (10); The left pole shoe ring I (3), the middle pole shoe ring I (5), and the right pole shoe ring I (7) are set on the shaft (1) at intervals, and the left pole shoe ring I (3), There is a permanent magnet ring I (9) between the middle pole shoe ring I (5) and the right pole shoe ring I (7), and the permanent magnet ring I (9) is set on the shaft (1); The left pole shoe ring II (4), the middle pole shoe ring II (6), and the right pole shoe ring II (8) are arranged on the inner wall of the casing (2), and the left pole shoe ring II (4) There is a permanent magnet ring II (10) between the middle pole shoe ring II (6) and the right pole shoe ring II (8), and the right pole shoe ring II (8) is arranged on the inner wall of the shell (2) ; The radial heights of the left pole shoe ring I (3) and the right pole shoe ring I (7) are the same as the radial height of the permanent magnet ring I (9), and the middle pole shoe ring I (5) The radial height is higher than the radial height of the permanent magnet ring I (9); the radial height of the middle pole shoe ring II (6) is higher than the radial height of the permanent magnet ring II (10), and the left The radial height of the pole shoe ring II (4) and the right pole shoe ring II (8) is higher than that of the middle pole shoe ring II (6); The axial length of the left pole shoe ring II (4) is greater than the axial length of the left pole shoe ring I (3), and smaller than the axial length of the left pole shoe ring I (3) and the permanent magnet ring I (9) The sum; the axial length of the right pole shoe ring II (8) is greater than the axial length of the right pole shoe ring I (7), less than the right pole shoe ring I (7) and the permanent magnet ring II (10) The sum of the axial lengths; the axial length of the middle pole shoe ring I (5) is greater than the axial length of the middle pole shoe ring II (6); The part of the inner surface of the left pole shoe ring II (4) corresponding to the outer surface of the left pole shoe ring I (3) is provided with pole teeth I (11), and the pole teeth I (11) are along the Extending radially to the outer surface of the left pole shoe ring I (3), there is a gap between the outer surface of the left pole shoe ring I (3), and the gap is filled with magnetic fluid for sealing; The part of the inner surface of the right pole shoe ring II (8) corresponding to the outer surface of the right pole shoe ring I (7) is provided with pole teeth II (12), and the pole teeth II (12) are Extending to the outer surface of the right pole shoe ring I (7), there is a gap between the outer surface of the right pole shoe ring I (7), and the gap is filled with magnetic fluid for sealing; The pole teeth III (13) are arranged on the inner surface of the middle pole shoe ring II (6), and the pole teeth III (13) extend radially toward the outer circle of the middle pole shoe ring I (5) , there is a gap between the outer surface of the pole shoe ring I (5), and the gap is filled with magnetic fluid for sealing; The magnetic fluid sealing unit is provided with 1-5 groups, arranged along the axial direction of the shaft (1); The number of pole teeth I (11) set on the inner circle of the left pole shoe ring II (4) is 1-5; the number of pole teeth II (11) set on the inner circle of the right pole shoe ring II (8) (12) The quantity is 1-5. 2. The multi-magnetic source symmetric magnetic fluid sealing device according to claim 1, characterized in that: the number of pole teeth III (13) provided on the inner surface of the middle pole shoe ring II (6) is 2 -10. 3. The multi-magnetic source symmetrical magnetic fluid sealing device according to claim 1, characterized in that: the size of the gap between the pole tooth I (11) and the outer surface of the left pole shoe ring I (3) is 0.05~3mm; the size of the gap between the pole tooth II (12) and the outer surface of the right pole shoe ring I (7) is 0.05~3mm; the pole tooth III (13) and the middle pole shoe ring I (5) The size of the gap between the outer circular surfaces is 0.05~3mm. 4. The multi-magnetic source symmetric magnetic fluid sealing device according to claim 1, characterized in that: said permanent magnet ring I (9) and permanent magnet ring II (10) are axially magnetized permanent magnets . 5. The multi-magnetic source symmetrical magnetic fluid sealing device according to claim 4, characterized in that: the direction of the magnetic force lines between two adjacent permanent magnet rings I (9) is opposite; the two adjacent permanent magnet rings The direction of the magnetic lines of force between II (10) is opposite; in each ferrofluid sealed unit, the directions of the magnetic force lines of the permanent magnet ring I (9) on the left and the permanent magnet ring II (10) are opposite, and the permanent magnet ring I on the right ( 9) The direction of the magnetic field lines of the permanent magnet ring II (10) is opposite. 6. The multi-magnetic source symmetric magnetic fluid sealing device according to claim 1, characterized in that: the outer circular surfaces of the left pole shoe ring II (4) and the right pole shoe ring II (8) are provided with A groove, a sealing ring (14) is arranged in the groove. 7. The multi-magnetic source symmetrical magnetic fluid sealing device according to claim 1, characterized in that it also includes a left magnetic isolation ring (15), a left second magnetic isolation ring (16), a right magnetic isolation ring (17 ), the right two magnetic rings (18); the left magnetic ring (15) and the right magnetic ring (17) are set on the shaft (1), and the left magnetic ring (15) is located at the left pole On the left side of the shoe ring I (3), the right first spacer magnetic ring (17) is located on the right side of the right pole shoe ring I (7); the left second spacer magnetic ring (16) and the right second spacer magnetic ring (18 ) is located on the inner wall of the shell (2), the left second magnetic ring (16) is located on the left side of the left pole shoe ring II (4), and the right second magnetic ring (18) is located at the right pole shoe ring II (8) Right. 8. The multi-magnetic source symmetrical magnetic fluid sealing device according to claim 7, characterized in that: it also includes a left bearing (19) and a right bearing (20); said left bearing (19) and right bearing (20 ) are respectively set on the shaft (1), and the left bearing (19) is set on the left side of the first magnetic spacer ring (15) and the second magnetic spacer ring (16) on the left, respectively with the first magnetic spacer ring (15) , the left two spaced magnetic rings (16) are in contact; the right bearing (20) is located on the right side of the right one spaced magnetic ring (17) and the right two spaced magnetic rings (18), respectively connected to the right one spaced magnetic ring ( 17) is in contact with the right second magnetic ring (18).

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