A seal sleeve for a rotor with an adjustable length and a method for adjusting the same

Abstract

The application discloses a sealing sleeve with adjustable length for a rotor and a method for adjusting the length of the sealing sleeve, the sealing sleeve comprises a lower sleeve part, an upper sleeve and a flexible bellows connected between the lower sleeve part and the upper sleeve, the upper sleeve is driven to move along the axial direction by a power system to increase or decrease the length of the sealing sleeve, and the application provides the sealing sleeve which can be adjusted on line, avoids the poor sealing of the sleeve when the rotor changes due to the poisson effect, and avoids the air leakage and the influence of the external environment on the rotor.

Description

Technical Field

[0001] This invention relates to the field of sealing sleeve technology, and in particular to a rotor sealing sleeve with adjustable length online and its adjustment method. Background Technology

[0002] Sealing sleeves are widely used in rotating machinery to provide the necessary vacuum environment for rotor operation, isolate the rotor from the external environment, protect the rotor from external environmental influences, and prevent the impact of debris on the outside when the rotor fails.

[0003] When the rotor rotates at high speed, axial deformation occurs due to the Poisson effect, and the rotor length changes with increasing speed. This leads to changes in the upper and lower fitting clearances, affecting the stable operation of the rotor. Designing a rotor sealing sleeve with an online adjustable length can solve the above problem. Summary of the Invention

[0004] The purpose of this invention is to address the issue that existing sealing sleeves are prone to gap formation, and to provide a rotor sealing sleeve with an online adjustable length.

[0005] Another object of the present invention is to provide a method for adjusting the sealing sleeve.

[0006] The technical solution adopted to achieve the purpose of this invention is:

[0007] A rotor sealing sleeve with online adjustable length includes a lower sleeve, an upper sleeve, and a flexible bellows sealingly connected between the two. The upper sleeve is driven by a power system to move along its axial direction to increase or decrease the length of the sealing sleeve.

[0008] In the above technical solution, the lower sleeve part includes a lower sleeve, a connecting plate and a lower sleeve fixing sleeve that are fixedly connected from bottom to top. The power system includes a motor fixedly mounted on the connecting plate, an external gear fixed on the motor output shaft of the motor, an internal gear meshing with the external gear and a threaded sleeve coaxially fixed to the outer ring of the internal gear. The threaded sleeve is connected to the lower sleeve fixing sleeve through a bearing, and the threaded sleeve is connected to the bottom of the upper sleeve through a thread.

[0009] In the above technical solution, the internal gear, threaded sleeve, bearing, lower sleeve fixing sleeve, flexible bellows, upper sleeve, lower sleeve and connecting plate are all coaxially arranged.

[0010] In the above technical solution, the lower sleeve fixing sleeve includes an integrally formed cylindrical part, an inner positioning ring, and an outer positioning ring.

[0011] In the above technical solution, the outer diameter of the outer positioning ring is the same as the outer diameter of the connecting plate.

[0012] In the above technical solution, the top of the upper sleeve is folded outward to form an external positioning ring, and a through hole for the rotor to pass through is formed at the center of the top of the upper sleeve.

[0013] In the above technical solution, the lower surface of the outer positioning ring and the upper surface of the inner positioning ring are respectively provided with annular fixing pieces.

[0014] In the above technical solution, the two ends of the flexible corrugated pipe are fixed to the outer positioning ring and the inner positioning ring respectively by two annular fixing pieces.

[0015] In the above technical solution, the motor is sealed and assembled onto the mounting hole on the connecting plate by a sealing plate.

[0016] In the above technical solution, the connecting plate and the lower sleeve, the lower sleeve fixing sleeve and the connecting plate, and the sealing plate and the connecting plate are respectively fastened with bolts.

[0017] In the above technical solution, a first sealing ring is provided between the connecting plate and the lower sleeve, a second sealing ring is provided at the connection between the lower sleeve fixing sleeve and the connecting plate, and a third sealing ring is provided at the connection between the sealing plate and the connecting plate.

[0018] In another aspect of the present invention, the method for adjusting the sealing sleeve specifically involves the power system driving the upper sleeve to move axially upward, causing the flexible bellows to extend and increasing the total length of the sealing sleeve; or the power system driving the upper sleeve to move axially downward, causing the flexible bellows to shorten and decreasing the total length of the sealing sleeve.

[0019] In the above technical solution, when the motor rotates, it drives the external gear to rotate, the external gear drives the internal gear to rotate, the internal gear drives the threaded sleeve to rotate, and the threaded sleeve drives the upper sleeve to move upward through the threaded engagement with the upper sleeve, the flexible bellows elongates, the total length of the sealing sleeve increases, and when the motor rotates in the opposite direction, the total length of the sealing sleeve decreases.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. When the rotor rotates at high speed, axial deformation will occur due to the Poisson effect, and the rotor length will change as the speed increases. This invention provides a sealing sleeve that can be adjusted online, which avoids air leakage due to poor sleeve sealing when the rotor changes due to the Poisson effect, thus preventing the rotor from being affected by the external environment.

[0022] 2. The flexible bellows is sealed to the top of the lower sleeve fixing sleeve to ensure the sealing performance when the upper and lower sleeves are axially relative to each other. The first sealing ring, the second sealing ring and the third sealing ring ensure the overall sealing effect of the sealing sleeve and increase its reliability.

[0023] 3. The annular fixing plate makes the installation of the flexible bellows easier, the overall structure of the sealing sleeve is more stable, and the performance reliability is improved. Attached Figure Description

[0024] Figure 1 The diagram shows a structural schematic of the sealing sleeve with adjustable length according to the present invention.

[0025] In the diagram: 1-Motor, 1-1-Output shaft, 2-External gear, 3-Internal gear, 4-Threaded sleeve, 5-Bearing, 6-Lower sleeve fixing sleeve, 6-1-Inner positioning ring, 6-2-Outer positioning ring, 6-3-Cylinder section, 7-Flexible bellows, 8-Upper sleeve, 8-1-Outer positioning ring, 8-2-Through hole, 9-Lower sleeve, 10-Connecting plate, 10-1-Assembly hole, 11-First sealing ring, 12-Second sealing ring, 13-Third sealing ring, 14-Annular fixing piece, 15-Sealing plate. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0027] Example 1

[0028] A rotor sealing sleeve with online adjustable length includes a lower sleeve portion, an upper sleeve 8, and a flexible bellows 7 sealingly connected between the two. The upper sleeve 8 is driven by a power system to move upward or downward along its axial direction to increase or decrease the length of the sealing sleeve. When the power system drives the upper sleeve to move upward axially, the flexible bellows extends, increasing the total length of the sealing sleeve; when the power system drives the upper sleeve to move downward axially, the flexible bellows shortens, decreasing the total length of the sealing sleeve.

[0029] The lower sleeve includes a lower sleeve 9, a connecting plate 10, and a lower sleeve fixing sleeve 6, which are fixedly connected from bottom to top, and the lower sleeve 9 is fixed on the base;

[0030] The power system includes a motor 1, an external gear 2, an internal gear 3, and a threaded sleeve 4. The motor 1 is fixedly mounted on the top inner edge of the connecting plate 10. The external gear 2 is fixed on the output shaft 1-1 of the motor 1. The external gear 2 meshes with the internal gear 3, and the external gear 2 drives the internal gear 3 to rotate. The outer circumference of the internal gear 3 is fixedly embedded in the inner wall of the threaded sleeve 4. The outer wall of the threaded sleeve 4 is mounted on the inner wall of the lower sleeve fixing sleeve 6 through a bearing 5. When the motor 1 drives the external gear 2 to rotate, the internal gear 3 rotates in the opposite direction, driving the threaded sleeve 4 to rotate coaxially and in the same direction. The top of the inner wall of the threaded sleeve 4 is provided with an internal thread, which engages with the external thread provided at the bottom of the upper sleeve 8, realizing the axial up-and-down movement of the upper sleeve 8. The top of the upper sleeve 8 is sealed to the top of the lower sleeve fixing sleeve 6 through a flexible bellows 7, ensuring the sealing performance when the upper sleeve 8 and the lower sleeve 9 are axially relative to each other. The entire sealing sleeve structure is simple, and the length adjustment process of the sealing sleeve is convenient and quick.

[0031] Example 2

[0032] Furthermore, the internal gear 3, threaded sleeve 4, bearing 5, lower sleeve fixing sleeve 6, flexible bellows 7, upper sleeve 8, lower sleeve 9, and connecting plate 10 are all coaxially arranged. The lower sleeve fixing sleeve 6 includes an integrally formed cylindrical part 6-3, an inner positioning ring 6-1, and an outer positioning ring 6-2. The outer diameter of the outer positioning ring 6-2 is the same as the outer diameter of the connecting plate 10. The top of the upper sleeve 8 is folded outward to form an outer positioning ring 8-1, and a through hole 8-2 for the rotor to pass through is formed at the center of the top. The through hole 8-2 is coaxially arranged with the upper sleeve 8. The lower surface of the outer positioning ring 8-1 and the upper surface of the inner positioning ring 6-1 are respectively provided with annular fixing pieces 14. The two ends of the flexible bellows 7 are respectively fixed to the outer positioning ring 8-1 and the inner positioning ring 6-1 by an annular fixing piece 14 for easy installation.

[0033] The motor 1 is sealed and assembled on the mounting hole 10-1 on the connecting plate 10 through the sealing plate 15 to ensure the sealing of the connection of the motor 1. The connecting plate 10 and the lower sleeve 9, the sealing plate 15 and the connecting plate 10, and the lower sleeve fixing sleeve 6 and the connecting plate 10 are respectively fastened with bolts. Specifically, the outer positioning ring 6-2 is fastened to the connecting plate 10 with bolts. A first sealing ring 11 is provided between the connecting plate 10 and the lower sleeve 9. A second sealing ring 12 is provided at the connection between the outer positioning ring 6-2 and the connecting plate 10. A third sealing ring 13 is provided at the connection between the sealing plate 15 and the connecting plate 10. The first sealing ring 11, the second sealing ring 12 and the third sealing ring 13 can better ensure the airtightness of the sealing sleeve.

[0034] Example 3

[0035] After installing the sealing sleeve as described in Example 1 or Example 2, the length of the sealing sleeve is adjusted through the following steps: The motor 1 is turned on. When the motor 1 rotates, it drives the external gear 2 to rotate. The external gear 2 drives the internal gear 3 to rotate. The internal gear 3 drives the threaded sleeve 4 to rotate. The threaded sleeve 4, through its threaded engagement with the upper sleeve 8, drives the upper sleeve 8 to move upwards, causing the flexible bellows 7 to extend and increasing the total length of the sealing sleeve. When the motor 1 rotates in the opposite direction, the total length of the sealing sleeve decreases. This ensures that the length of the sealing sleeve can be dynamically adjusted in real time according to the rotor speed.

[0036] For ease of explanation, spatial relative terms such as “up,” “down,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “down” of other elements or features would be positioned “up” of those other elements or features. Therefore, the exemplary term “down” can encompass both up and down orientations. The device may be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0037] Moreover, relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0038] The above description is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A sealing sleeve for a rotor with an online adjustable length, characterized in that, It includes a lower sleeve, an upper sleeve, and a flexible bellows sealingly connected between the two. The upper sleeve is driven by a power system to move along its axial direction to increase or decrease the length of the sealing sleeve. The lower sleeve includes a lower sleeve, a connecting plate, and a lower sleeve fixing sleeve, which are fixedly connected from bottom to top. The power system includes a motor fixedly mounted on the connecting plate, an external gear fixed on the motor output shaft of the motor, an internal gear meshing with the external gear, and a threaded sleeve coaxially fixed to the outer ring of the internal gear. The threaded sleeve is connected to the lower sleeve fixing sleeve through a bearing, and the threaded sleeve is connected to the bottom of the upper sleeve through a thread.

2. The sealing sleeve as described in claim 1, characterized in that, The internal gear, threaded sleeve, bearing, lower sleeve fixing sleeve, flexible bellows, upper sleeve, lower sleeve and connecting plate are all coaxially arranged.

3. The sealing sleeve as described in claim 1, characterized in that, The lower sleeve fixing sleeve includes an integrally formed cylindrical part, an inner positioning ring, and an outer positioning ring.

4. The sealing sleeve as described in claim 3, characterized in that, The outer diameter of the outer positioning ring is the same as the outer diameter of the connecting plate.

5. The sealing sleeve as described in claim 3, characterized in that, The top of the upper sleeve is folded outward to form an external positioning ring, and a through hole is formed at the center of the top of the upper sleeve for the rotor to pass through.

6. The sealing sleeve as described in claim 5, characterized in that, The lower surface of the outer positioning ring and the upper surface of the inner positioning ring are respectively provided with annular fixing pieces.

7. The sealing sleeve as described in claim 6, characterized in that, The two ends of the flexible corrugated pipe are fixed to the outer positioning ring and the inner positioning ring respectively by two annular fixing plates.

8. The sealing sleeve as described in claim 1, characterized in that, The motor is sealed and assembled onto the mounting hole on the connecting plate via a sealing plate.

9. The sealing sleeve as described in claim 8, characterized in that, The connecting plate and the lower sleeve, the lower sleeve fixing sleeve and the connecting plate, and the sealing plate and the connecting plate are respectively fastened with bolts.

10. The sealing sleeve as described in claim 9, characterized in that, A first sealing ring is provided between the connecting plate and the lower sleeve, a second sealing ring is provided at the connection between the lower sleeve fixing sleeve and the connecting plate, and a third sealing ring is provided at the connection between the sealing plate and the connecting plate.

11. The method for adjusting the sealing sleeve as described in any one of claims 1-10, characterized in that, The power system drives the upper sleeve to move axially upward, the flexible bellows extends, and the total length of the sealing sleeve increases; the power system drives the upper sleeve to move axially downward, the flexible bellows shortens, and the total length of the sealing sleeve decreases.

12. The adjustment method as described in claim 11, characterized in that, When the motor rotates, it drives the external gear to rotate, which in turn drives the internal gear to rotate. The internal gear then drives the threaded sleeve to rotate. The threaded sleeve, through its threaded engagement with the upper sleeve, drives the upper sleeve to move upward, causing the flexible bellows to elongate and the total length of the sealing sleeve to increase. When the motor rotates in the opposite direction, the total length of the sealing sleeve decreases.

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