Reciprocating magnetic power transmission rotary seal

Abstract

The application discloses a reciprocating magnetic transmission rotary sealing device, which comprises a driven rotating shaft, a first linear bearing, a flange isolation sleeve, a first permanent magnet, a first balance force magnet, a second permanent magnet, a second balance force magnet, a second linear bearing and a driving rotating shaft. The flange isolation sleeve is located between the first permanent magnet and the second permanent magnet, the first permanent magnet and the second permanent magnet rotate synchronously under the action of magnetic field force, and the first balance force magnet and the second balance force magnet are opposite to each other at the same end, so as to ensure that when the driving rotating shaft moves reciprocally along the axial direction under the support of the second linear bearing, the driven rotating shaft moves synchronously and reciprocally along the axial direction under the support of the first linear bearing. The reciprocating magnetic transmission rotary sealing device of the embodiment of the application realizes synchronous circumferential rotary motion and axial reciprocating motion of the driving rotating shaft and the driven rotating shaft.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical engineering sealing, in particular to a reciprocating magnetic transmission rotary sealing device with reciprocating and rotating motion. BACKGROUND

[0002] In the industrial production of vacuum coating and biological fermentation, a vacuum cavity or a high-pressure cavity is usually used as a reaction kettle for operation. During the production process, an external drive motor is used to drive the components in the vacuum cavity or high-pressure cavity to rotate circumferentially and move axially reciprocally, which requires that the sealing part needs to ensure zero leakage during rotation and movement, otherwise it will cause product quality decline, equipment damage, environmental pollution and even direct threat to personal safety. This puts high requirements on the sealing assembly of the dynamic sealing part. In the field of dynamic sealing, magnetic transmission sealing can achieve zero leakage from static to high speed and from normal pressure to high pressure, so its application is increasingly widespread.

[0003] In related technologies, magnetic transmission sealing mainly converts dynamic sealing into static sealing to achieve zero leakage. For example, the patent magnetic transmission sealing (Patent No. 200820124547.2) proposes a magnetic field force generated by the staggered arrangement of the inner and outer rotor magnets to achieve transmission. In this patent, the magnet poles are arranged along the radial direction, which can realize the synchronous rotation of the input shaft and the output shaft. In addition, the magnets of the inner and outer rotors in other technologies have also been arranged on the end face, which can also realize the synchronous rotation of the inner and outer rotors through the magnetic field gradient. However, the technical solutions mentioned in related technologies can only solve the problem of synchronous rotation and cannot realize the reciprocating motion of the rotating shaft along the axial direction. With the development of industrial automation, the demand for reciprocating and rotating composite motion of the reaction chamber is increasing, so it is necessary to propose a zero-leakage sealing device that can meet the reciprocating and rotating motion. SUMMARY

[0004] The present application aims to at least partially solve one of the technical problems in the related art.

[0005] To this end, the present application proposes a reciprocating magnetic transmission rotary sealing device, which can simultaneously realize the circumferential rotation of the rotating shaft and the axial reciprocating movement while ensuring zero-leakage sealing effect.

[0006] The reciprocating magnetic transmission rotary sealing device comprises a driven rotating shaft, a first dustproof end cover, a first flange sleeve, a first positioning snap spring, a second positioning snap spring, a first linear bearing, a flange isolation sleeve, a first permanent magnet, a first balance force magnet, a first end face sealing ring, a second end face sealing ring, a second permanent magnet, a second balance force magnet, a third positioning snap spring, a fourth positioning snap spring, a second linear bearing, a second flange sleeve, a second dustproof end cover, a driving rotating shaft, a fifth positioning snap spring, a sixth positioning snap spring, a seventh positioning snap spring, an eighth positioning snap spring, a first positioning sleeve, a first bearing, a second bearing, a first isolation sleeve, a fixed base, a second positioning sleeve, a third bearing, a fourth bearing, a second isolation sleeve, a ninth positioning snap spring, a tenth positioning snap spring and a tenth positioning snap spring.

[0007] The connection between the parts of the device is as follows:

[0008] The first permanent magnet is fixed to the right inner wall of the driven rotating shaft, the first balance force magnet is fixed to the central part of the groove bottom of the right side of the driven rotating shaft, the second balance force magnet is fixed to the central part of the left end face of the driving rotating shaft, the second balance force magnet is opposite to the same end of the first balance force magnet, the second permanent magnet is fixed to the polygonal side wall of the fixed base, the seventh positioning snap spring is used for axially fixing the fixed base, the eighth positioning snap spring is fixed to the snap spring groove in the middle of the driving rotating shaft, the first positioning sleeve is sleeved on the outside of the driving rotating shaft, and then the second bearing, the first isolation sleeve and the first bearing are sequentially installed from right to left, the fifth positioning snap spring and the sixth positioning snap spring are used for fixing the parts on the shaft, then the second linear bearing is installed in the second flange outer sleeve, and the positioning shaft shoulder in the inner hole of the second flange outer sleeve and the fourth positioning snap spring are used for axially fixing the second linear bearing. After the driving rotating shaft with the above-mentioned parts is installed and is arranged in the second linear bearing from right to left, the third positioning snap spring is fixed to the left end snap spring groove of the first positioning sleeve for axial limiting, the second dustproof end cover is fixed to the right side of the second flange outer sleeve through threaded connection. The second flange outer sleeve with the above-mentioned parts is installed and is screwed in the blind hole of the flange isolation sleeve, and the input end is formed. The tenth positioning snap spring is fixed to the right snap spring groove, the second positioning sleeve is sleeved on the outside of the driven rotating shaft, then the third bearing, the second isolation sleeve and the fourth bearing are sequentially installed from left to right, the ninth positioning snap spring and the tenth positioning snap spring are used for fixing the parts on the shaft, then the first linear bearing is installed in the first flange outer sleeve, and the first positioning snap spring and the second positioning snap spring are used for axially fixing the first linear bearing. After the driven rotating shaft with the above-mentioned parts is installed and is arranged in the first linear bearing from right to left, the first dustproof end cover is fixed to the left side of the first flange outer sleeve through threaded connection, and the output end is formed. Finally, the second end face sealing ring is installed in the left groove of the flange isolation sleeve, the flange isolation sleeve is screwed to the blind hole on the right side of the first flange outer sleeve, the first end face sealing ring 8 is installed in the left groove of the first flange outer sleeve 3, and the reciprocating magnetic force transmission rotary sealing device is assembled. The right side of the fixed base forms the first cavity, the left side of the fixed base forms the second cavity, the right side of the second positioning sleeve forms the third cavity, the left side of the second positioning sleeve forms the fourth cavity, and the first cavity, the second cavity, the third cavity and the fourth cavity are used for providing displacement space for the driving rotating shaft and the driven rotating shaft in the process of axial reciprocating movement.

[0009] The beneficial effects of the present application are as follows:

[0010] The reciprocating magnetic transmission rotary sealing device can ensure synchronous circumferential rotary motion and axial reciprocating movement of the driving shaft and the driven shaft within the axial displacement range under the action of the magnetic force between the first permanent magnet and the second permanent magnet, the balance force of the first balance force magnet and the second balance force magnet, and the axial limiting action of the third positioning snap spring and the third positioning boss. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a cross-sectional structure schematic diagram of the reciprocating magnetic transmission rotary sealing device.

[0012] Figure 2 is Figure 1 is a cross-sectional structure schematic diagram of the reciprocating magnetic transmission rotary sealing device.

[0013] Figure 3 is a partial cross-sectional view at A-A.

[0014] REFERENCE NUMERALS:

[0015] A reciprocating magnetic transmission rotary sealing device 100;

[0016] A driven shaft 1; a first key groove 101;

[0017] A first dustproof end cover 2;

[0018] A first flange sleeve 3;

[0019] A first positioning snap spring 401; a second positioning snap spring 402;

[0020] A first linear bearing 5;

[0021] A flange isolation sleeve 6;

[0022] A first permanent magnet 7; a first balance force magnet 701;

[0023] A first end face sealing ring 8;

[0024] A second end face sealing ring 9;

[0025] A second permanent magnet 10; a second balance force magnet 1001;

[0026] A third positioning snap spring 1101; a fourth positioning snap spring 1102;

[0027] A second linear bearing 12;

[0028] A second flange sleeve 13; a second positioning boss 1301;

[0029] A second dustproof end cover 14;

[0030] Active rotating shaft 15; second keyway 1501;

[0031] Fifth positioning snap spring 1601; sixth positioning snap spring 1602; seventh positioning snap spring 1604; eighth positioning snap spring 1604;

[0032] First positioning sleeve 17; third positioning boss 1701; fourth positioning boss 1702;

[0033] First bearing 1801; second bearing 1802;

[0034] First isolation sleeve 19;

[0035] Fixed base 20;

[0036] Second positioning sleeve 21; first positioning boss 2101;

[0037] Third bearing 2201; fourth bearing 2202;

[0038] Second isolation sleeve 23;

[0039] Ninth positioning snap spring 2401; tenth positioning snap spring 2402; tenth positioning snap spring 2403;

[0040] First cavity 2501; second cavity 2502; third cavity 2503; fourth cavity 2504; DETAILED DESCRIPTION

[0041] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the embodiments given are by way of illustration only and are not intended to be limiting of the present application.

[0042] Reference will now be made to the drawings, wherein Figure 1 to the drawings Figure 3 The technical solutions of the present application are described in detail below.

[0043] As Figure 1As shown, the reciprocating magnetic transmission rotary sealing device 100 of the embodiment of the application comprises: a driven rotating shaft 1, a first dustproof end cover 2, a first flange sleeve 3, a first positioning snap spring 401, a second positioning snap spring 402, a first linear bearing 5, a flange isolation sleeve 6, a first permanent magnet 7, a first balance force magnet 701, a first end face sealing ring 8, a second end face sealing ring 9, a second permanent magnet 10, a second balance force magnet 1001, a third positioning snap spring 1101, a fourth positioning snap spring 1102, a second linear bearing 12, a second flange sleeve 13, a second positioning boss 1301, a second dustproof end cover 14, a driving rotating shaft 15, a fifth positioning snap spring 1601, a sixth positioning snap spring 1602, a seventh positioning snap spring 1604, an eighth positioning snap spring 1604, a first positioning sleeve 17, a third positioning boss 1701, a fourth positioning boss 1702, a first bearing 1801, a second bearing 1802, a first isolation sleeve 19, a fixed base 20, a second positioning sleeve 21, a first positioning boss 2101, a third bearing 2201, a fourth bearing 2202, a second isolation sleeve 23, a ninth positioning snap spring 2401, a tenth positioning snap spring 2402, and a tenth positioning snap spring 2403.

[0044] The connection between the parts of the device:

[0045] The first permanent magnet 7 is fixed on the polygonal surface of the right inner wall of the driven rotating shaft 1 in the form of N and S level radial alternation, the first balance force magnet 701 is fixed in the groove at the bottom center of the right side of the driven rotating shaft 1, the second balance force magnet 1001 is fixed on the left side end face of the driving rotating shaft 15, and the second balance force magnet 1001 is opposite to the same end of the first balance force magnet 701, the second permanent magnet 10 is fixed on the polygonal side wall surface of the fixed base 20 in the form of N and S level radial alternation, and the polygonal surface of the right inner wall of the driven rotating shaft 1 is the same as the polygonal side wall surface of the fixed base 20, and the A-A sectional view is as follows: Figure 3The fixed base 20 is installed from right to left on the leftmost end of the driving shaft 15, in contact with the second balance force magnet 1001, and the seventh positioning snap spring 1604 is used to axially fix the fixed base 20. The eighth positioning snap spring 1604 is fixed in the snap spring groove in the middle of the driving shaft 15. After the first positioning sleeve 17 is sleeved on the outside of the driving shaft 15, the second bearing 1802, the first isolation sleeve 19, and the first bearing 1801 are installed from right to left in sequence. The outer cylindrical surface of the first positioning sleeve 17 includes a third positioning boss 1701 on the right side, and the inner cylindrical surface of the first positioning sleeve 17 includes a fourth positioning boss 1702 on the left side. The outer ring of the second bearing 1802 is in contact with the fourth positioning boss 1702. The fifth positioning snap spring 1601 is used to fix the inner ring of the first bearing 1801 to the driving shaft 15, and the sixth positioning snap spring 1602 is used to fix the outer ring of the first bearing 1801 to the first positioning sleeve 17. Then, the second linear bearing 12 is installed inside the second flange outer sleeve 13, and the second positioning boss 1301 in the inner hole of the second flange outer sleeve 13 and the fourth positioning snap spring 1102 are used to axially fix the second linear bearing 12. After the driving shaft 15 with the above-mentioned components installed is installed from right to left inside the second linear bearing 12, the third positioning snap spring 1101 is fixed in the snap spring groove at the left end of the first positioning sleeve 17 for axial limiting. Then, the second dustproof end cover 14 is fixed to the right side of the second flange outer sleeve 13 by threaded connection. At this time, the driving shaft 15 can rotate around the axis, and can also reciprocate in the axial direction. When the driving shaft 15 moves to the rightmost side, the third positioning snap spring 1101 is in contact with the left end surface of the second linear bearing 12 for limiting. When the driving shaft 15 moves to the leftmost side, the third positioning boss 1701 on the right side of the first positioning sleeve 17 is in contact with the right end surface of the second linear bearing 12 for limiting. The second flange outer sleeve 13 with the above-mentioned components installed is screwed into the blind hole of the flange isolation sleeve 6. Thus, the input end combination is completed.

[0046] Then the tenth positioning spring 2402 is fixed in the right side spring groove, the second positioning sleeve 21 is sleeved outside the driven shaft 1, the outer cylindrical surface of the second positioning sleeve 21 is a smooth surface, the inner cylindrical surface includes the first positioning boss 2101, the third bearing 2201, the second isolation sleeve 23 and the fourth bearing 2202 are sequentially installed from left to right, the outer ring of the third bearing 2201 is in contact with the first positioning boss 2101, the outer ring of the fourth bearing 2202 is fixed with the second isolation sleeve 23 by the ninth positioning spring 2401, the inner ring of the fourth bearing 2202 is fixed with the driven shaft 1 by the tenth positioning spring 2403, then the first linear bearing 5 is installed inside the first flange outer sleeve 3, and the first linear bearing 5 is axially fixed by the first positioning spring 401 and the second positioning spring 402. After the driven shaft 1 with the above-mentioned components is installed into the first linear bearing 5 from right to left, the first dustproof end cover 2 is fixed with the left side of the first flange outer sleeve 3 by threaded connection. At this time, the driven shaft 1 can rotate around the axis, and can reciprocate along the axis, and thus the output end combination is completed.

[0047] Finally, the second end face sealing ring 9 is installed in the left side groove of the flange isolation sleeve 6, the flange isolation sleeve 6 is threadedly connected with the blind hole on the right side of the first flange outer sleeve 3, and the first end face sealing ring 8 is installed in the left side groove of the first flange outer sleeve 3, and thus the reciprocating magnetic transmission rotary sealing device is installed.

[0048] The driven shaft 1 is supported by the third bearing 2201 and the fourth bearing 2202 to realize axial rotation, the whole component formed by the driven shaft 1, the third bearing 2201, the fourth bearing 2202 and the second isolation sleeve 23 is moved axially under the action of the first linear bearing 5, and the axial movement space of the whole component is limited in the first flange outer sleeve 3 by size design; the driving shaft 15 is supported by the first bearing 1801 and the second bearing 1802 to realize axial rotation, the whole component formed by the driving shaft 15, the fixed base 20, the first bearing 1801, the second bearing 1802 and the first isolation sleeve 19 is moved axially under the action of the second linear bearing 12, and the axial movement space of the whole component is limited in the second flange outer sleeve 13 by size design.

[0049] The first permanent magnet 7 and the second permanent magnet 10 each include a plurality of permanent magnets, and eight permanent magnets are taken as an example in the embodiment, as shown in Figure 3As shown. When the reciprocating magnetic transmission rotary sealing device described in the application is installed, the opposite poles of the first permanent magnet 7 and the second permanent magnet 10 attract each other, and the magnetic field force generated by the magnetic field gradient performs circumferential positioning. At this time, the right side of the fixed base 20 forms a first cavity 2501, the left side of the fixed base 20 forms a second cavity 2502, the right side of the second positioning sleeve 21 forms a third cavity 2503, and the left side of the second positioning sleeve 21 forms a fourth cavity 2504. The above-mentioned first cavity 2501, second cavity 2502, third cavity 2503, and fourth cavity 2504 are used to provide displacement space for the axial reciprocating movement of the driving shaft 15 and the driven shaft 1. The first key groove 101 is used to connect with the internal load of the working chamber through a shaft coupling, and the second key groove 1501 is used to connect with the atmosphere side driving motor through a shaft coupling.

[0050] As shown, the initial state after installation Figure 1 At this time, the driving shaft 15 is located at the right limit position, the third positioning spring 1101 is in contact with the left end face of the second linear bearing 12 for limiting, and the driving shaft 15 can rotate around the axis. Under the action of the magnetic field force between the second permanent magnet 10 and the first permanent magnet 7, the driven shaft 1 is driven to rotate; when the driving shaft 15 moves to the left limit position along the axial direction, as shown, Figure 2 Under the action of the magnetic field force between the second permanent magnet 10 and the first permanent magnet 7 and the magnetic field force between the first balance force magnet 701 and the second balance force magnet 1001, the driven shaft 1 is driven to move to the left limit position along the axial direction. The third positioning boss 1701 on the right side of the first positioning sleeve 17 is in contact with the right end face of the second linear bearing 12 for axial limiting. Under the axial limiting action of the third positioning spring 1101 and the third positioning boss 1701, the driving shaft 15 and the driven shaft 1 can realize synchronous circumferential rotary motion and axial reciprocating movement in the axial displacement range. The axial displacement limit range defined by the left end face of the third positioning boss 1701 and the right end face of the second linear bearing 12 should be smaller than the axial length of the first cavity 2501, the second cavity 2502, the third cavity 2503, and the fourth cavity 2504.

[0051] In the description of the application, it should be understood that the terms "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0052] In addition, the terms "first", "second", etc. are used only for the purpose of description, and should not be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least six or more even numbers, such as six, eight, ten, etc., unless otherwise specifically limited.

[0053] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and other terms should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A reciprocating magnetic drive rotary seal apparatus, characterized by, Comprise: Driven shaft, the driven shaft left side includes the first key groove, the driven shaft right side inner wall includes the polygonal surface, the driven shaft right side bottom central part includes the recess; The first permanent magnet is fixed on the polygonal surface of the right inner wall of the driven shaft in the form of N, S level radial alternation; The first balance force magnet is fixed in the recess of the right bottom center of the driven shaft The first flange sleeve has a sealing ring groove on the left flange end face, and a threaded blind hole on the right flange end face; The first linear bearing is fixed on the left inner cylindrical surface of the first flange sleeve through the first positioning spring and the second positioning spring; The outer cylindrical surface of the second positioning sleeve is smooth, the outer cylindrical surface of the second positioning sleeve is in contact with the inner ring of the first linear bearing, and the inner cylindrical surface of the second positioning sleeve comprises a first positioning boss; The third bearing and the fourth bearing are isolated and installed through the second isolation sleeve, and the third bearing and the fourth bearing are axially fixed through the ninth positioning spring and the first positioning boss of the inner cylindrical surface of the second positioning sleeve; Wherein the driven shaft realizes axial rotation under the support of the third bearing and the fourth bearing, the overall component formed by the driven shaft, the third bearing, the fourth bearing and the second isolation sleeve realizes axial movement under the action of the first linear bearing, and the internal part of the first flange sleeve is limited in size to define the axial movement space of the overall component; The driving shaft right side includes the second key groove; The second balance force magnet is fixed on the left side end face of the driving shaft, and the second balance force magnet is opposite to the same end of the first balance force magnet; The end face of the fixed base is a regular polygon, and the number of polygons is the same as that of the polygonal surface of the right inner wall of the driven shaft; The second permanent magnet is fixed on the polygonal side wall surface of the fixed base in the form of N, S level radial alternation, and the number of the second permanent magnet is the same as that of the first permanent magnet; The second flange sleeve includes a second positioning boss on the left side of the inner cylindrical surface; The second linear bearing is fixed on the inner cylindrical surface of the second flange sleeve through the fourth positioning spring and the second positioning boss on the left side of the inner cylindrical surface of the second flange sleeve; The outer cylindrical surface of the first positioning sleeve includes a third positioning boss on the right side, the inner cylindrical surface of the first positioning sleeve includes a fourth positioning boss on the left side, the outer cylindrical surface is in contact with the inner ring of the second linear bearing, and the inner cylindrical surface of the second positioning sleeve comprises a positioning boss; The first bearing and the second bearing are isolated and installed through the first isolation sleeve, and the first bearing and the second bearing are axially fixed through the sixth positioning spring and the fourth positioning boss on the left side of the inner cylindrical surface of the first positioning sleeve; The main rotating shaft is axially rotated under the support of the first bearing and the second bearing, the whole component formed by the main rotating shaft, the fixed base, the first bearing, the second bearing and the first isolation sleeve is axially moved under the action of the second linear bearing, and the inside of the second flange sleeve is designed in size to limit the axial movement space of the whole component; The flange isolation sleeve has a sealing ring groove on the left flange end face and a threaded blind hole on the right flange end face; The left end face of the flange isolation sleeve is fixed with the right end face of the first flange sleeve, the right end face of the flange isolation sleeve is fixed with the left end face of the second flange sleeve, the flange isolation sleeve isolates the first permanent magnet and the second permanent magnet, the second flange sleeve and the flange isolation sleeve limit the first cavity and the second cavity for the axial movement of the main rotating shaft, and the first flange sleeve and the flange isolation sleeve limit the third cavity and the fourth cavity for the axial movement of the driven rotating shaft.

2. The rotating seal apparatus of claim 1, wherein, The number of the first permanent magnet and the second permanent magnet is at least six or more even numbers.

3. The rotating seal apparatus of claim 1, wherein, The axial displacement limit range defined by the left end face of the third positioning boss and the right end face of the second linear bearing should be less than the axial length of the first cavity, the second cavity, the third cavity and the fourth cavity.

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