Sealing sleeve with bidirectional fine-tuning length

Abstract

The present invention discloses a sealing sleeve with bidirectional length fine-tuning, comprising an upper sleeve and a lower sleeve; a convex edge is formed at the bottom end of the upper sleeve; the lower sleeve comprises an inner wall tube and an outer wall tube; the convex edge is embedded in the inner cavity of the outer wall tube, and the upper and lower end faces thereof are respectively provided with a sleeve extension sealing ring and a sleeve shortening sealing ring; a clamping flange is sleeved on the outer portion of the upper sleeve, the clamping flange is fixedly connected to the outer wall tube through a plurality of clamping bolts, and is connected to the convex edge through a plurality of sleeve extension adjustment bolts, and a plurality of sleeve shortening adjustment bolts are also provided on the clamping flange. The present invention provides a sleeve with good sealing performance when fine-tuning extension or shortening, which is used to provide a vacuum environment for a high-speed rotating rotor. After evacuation, the rotor rotates in the sleeve. When the rotor length changes within a small range, the clearance requirement between the rotor and the upper and lower supports is met by adjusting the sleeve length, and the sealing performance of the sleeve can be guaranteed when the sleeve is extended and shortened.

Description

Technical Field

[0001] The invention belongs to the field of sealing sleeves, and in particular relates to a sealing sleeve with bidirectional fine-adjustable length. Background Art

[0002] Sealing sleeves are widely used in high-speed rotating machinery, providing the necessary vacuum environment for rotor operation, preventing the external environment from affecting the rotor operation, and can also effectively prevent the leakage and impact of debris after rotor failure.

[0003] When the rotor rotates at high speed, the upper and lower supports need to provide sufficient bearing capacity and stiffness. The support parameters are greatly affected by the rotor length. At the same time, due to the Poisson effect and structural deformation, the axial length of the rotor will change during operation, which in turn affects the support parameters. The length of the conventional sealing sleeve is fixed after molding, and it has poor applicability to rotors with varying lengths. Therefore, it is urgent to design a sealing sleeve with adjustable length to solve this problem. Summary of the invention

[0004] The present invention is proposed to overcome the shortcomings of the prior art, and its purpose is to provide a sealing sleeve with bidirectional fine-adjustable length.

[0005] The present invention is achieved through the following technical solutions:

[0006] A sealing sleeve with bidirectional fine-adjustable length comprises a sleeve upper portion and a sleeve lower portion; a convex edge is formed at the bottom end of the sleeve upper portion; the sleeve lower portion is a stepped tube structure consisting of a small-diameter inner wall tube and a large-diameter outer wall tube; the convex edge is embedded in the inner cavity of the outer wall tube, and a sleeve extension sealing ring and a sleeve shortening sealing ring are respectively arranged on the upper and lower end faces thereof; a clamping flange is sleeved on the outside of the sleeve upper portion, the clamping flange is fixedly connected to the outer wall tube by a plurality of clamping bolts, and is connected to the convex edge by a plurality of sleeve extension adjustment bolts, and a plurality of sleeve shortening adjustment bolts are also arranged on the clamping flange.

[0007] In the above technical solution, an annular groove is formed on the end surface of the outer wall tube, and a flange sealing ring is arranged in the annular groove.

[0008] In the above technical solution, the annular groove is arranged on the inner side of the circumference where the clamping bolt is located.

[0009] In the above technical solution, the outer diameter of the flange matches the inner diameter of the outer wall tube.

[0010] In the above technical solution, the upper part of the sleeve is coaxial with the lower part of the sleeve.

[0011] In the above technical solution, the inner diameter of the upper part of the sleeve is the same as the inner diameter of the inner wall tube, and the outer diameter of the outer wall tube is the same as the outer diameter of the clamping flange.

[0012] In the above technical solution, the convex edge forms a threaded hole at the position of the sleeve extension adjustment bolt, and forms a shallow groove at the position of the sleeve shortening adjustment bolt.

[0013] In the above technical solution, the bottom end of the sleeve shortening adjustment bolt can contact the top surface of the convex edge.

[0014] In the above technical solution, a groove is formed on the bottom surface of the clamping flange, and the inner diameter of the groove is the same as the inner diameter of the outer wall tube.

[0015] In the above technical solution, the plurality of clamping bolts, sleeve lengthening adjustment bolts and sleeve shortening adjustment bolts are evenly distributed along the circumference, and the sleeve lengthening adjustment bolts, sleeve shortening adjustment bolts and clamping bolts are distributed in sequence from the inside to the outside.

[0016] The beneficial effects of the present invention are:

[0017] The present invention provides a sleeve with good sealing performance when the sleeve is extended or shortened for fine adjustment, which is used to provide a vacuum environment for a high-speed rotating rotor. After evacuation, the rotor rotates in the sleeve. When the rotor length changes within a small range, the clearance requirement between the rotor and the upper and lower supports is met by adjusting the sleeve length. The sealing performance of the sleeve can be guaranteed when the sleeve is extended or shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of a sealing sleeve of the present invention whose length can be finely adjusted in both directions;

[0019] Figure 2 yes Figure 1 Cross-section along AA direction.

[0020] in:

[0021] 1 Upper part of sleeve 11 Raised edge

[0022] 2 Sleeve lower part

[0023] 21 Inner wall tube 22 Outer wall tube

[0024] 3 Clamping flange 4 Clamping bolt

[0025] 5 Socket extension adjustment bolt 6 Socket shortening adjustment bolt

[0026] 7 Flange seal 8 Sleeve extension seal

[0027] 9 Sleeve shortening seal.

[0028] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the sealing sleeve with bidirectional fine-tuning length of the present invention will be further explained below in conjunction with the accompanying drawings and through specific implementation methods.

[0030] like Figure 1 , 2 As shown, a sealing sleeve with bidirectional fine-adjustable length comprises a sleeve upper part 1, a sleeve lower part 2, a sealing mechanism and a length adjustment mechanism;

[0031] The bottom end of the sleeve upper portion 1 forms a convex edge 11;

[0032] The sleeve lower part 2 is a stepped tube structure consisting of a small-diameter inner wall tube 21 and a large-diameter outer wall tube 22;

[0033] The convex edge 11 is embedded in the inner cavity of the outer wall tube 22, and a clamping flange 3 is sleeved on the outer portion of the sleeve upper part 1, and the clamping flange 3 is fixedly connected to the outer wall tube 22 through a plurality of clamping bolts 4;

[0034] The sealing mechanism comprises a sleeve extension sealing ring 8 and a sleeve shortening sealing ring 9 arranged on the upper and lower end surfaces of the convex edge 11;

[0035] The length adjustment mechanism includes a sleeve extension adjustment bolt 5 and a sleeve shortening adjustment bolt 6. The sleeve extension adjustment bolt 5 passes through the clamping flange 3 and is threadedly connected to the convex edge 11. The sleeve shortening adjustment bolt 6 passes through the clamping flange 3, and the bottom surface can contact the top surface of the convex edge 11. The convex edge 11 forms a threaded hole corresponding to the position of the sleeve extension adjustment bolt 5, and forms a shallow groove corresponding to the position of the sleeve shortening adjustment bolt 6.

[0036] The plurality of clamping bolts 4, sleeve extension adjustment bolts 5 and sleeve shortening adjustment bolts 6 are uniformly distributed along the circumference, and the sleeve extension adjustment bolts 5, sleeve shortening adjustment bolts 6 and clamping bolts 4 are distributed sequentially from the inside to the outside, and the three are staggered. In this embodiment, three clamping bolts 4, three sleeve extension adjustment bolts 5 and three sleeve shortening adjustment bolts 6 are used.

[0037] The outer diameter of the convex edge 11 matches the inner diameter of the outer wall tube 22 , the sleeve upper part 1 and the sleeve lower part 2 are coaxial, the inner diameter of the sleeve upper part 1 is the same as the inner diameter of the inner wall tube 21 , and the outer diameter of the outer wall tube 22 is the same as the outer diameter of the clamping flange 3 .

[0038] In this embodiment, in order to further ensure the sealing performance of the sleeve, an annular groove is formed on the end surface of the outer wall tube 22, and a flange sealing ring 7 is arranged in the annular groove. The annular groove is arranged on the inner side of the circumference where the clamping bolt 4 is located. A groove is formed on the bottom surface of the clamping flange 3, and the inner diameter of the groove is the same as the inner diameter of the outer wall tube 22. The flange sealing ring 7 and the sleeve extension sealing ring 8 form an inner and outer double-layer sealing structure at the connection between the clamping flange 3 and the sleeve lower part 2 to ensure the sealing performance of the sleeve.

[0039] Working principle of the present invention:

[0040] Generally, the convex edge of the upper part of the sleeve is located in the middle of the inner cavity of the outer wall of the lower part of the sleeve. At this time, both the upper and lower sealing rings have a certain amount of pressure and can be sealed. When the upper part of the sleeve moves upward, the total length of the sleeve is extended, the lower sealing ring is no longer compressed, and the sealing is achieved by compressing the upper sealing ring; when the upper part of the sleeve moves downward, the upper sealing ring is no longer compressed, and the sealing is achieved by compressing the lower sealing ring.

[0041] The assembly method of the present invention:

[0042] Fix the sleeve lower part 2, insert the sleeve shortening sealing ring 9, press the convex edge 11 of the sleeve upper part 1 on the sleeve shortening sealing ring 9, put the sleeve extension sealing ring 8 into the corresponding position above the convex edge 11, put the flange sealing ring 7 into the corresponding position of the sleeve lower part 2, put the clamping flange 3 into the sleeve upper part 1 and press it on the sleeve lower part 2, and tighten the six clamping bolts 4.

[0043] The method of using the present invention:

[0044] Sleeve shortening adjustment and sealing: Screw the three sleeve shortening adjustment bolts 6 into the clamping flange 3 and make contact with the sleeve upper part 1. Continue to screw in the three sleeve shortening adjustment bolts 6. The sleeve upper part 1 will be squeezed and move downward to compress the sleeve shortening sealing ring 9. The total length of the sleeve is shortened, and the sleeve shortening sealing ring 9 plays a sealing role.

[0045] Elongation adjustment and sealing: Remove the three sleeve shortening adjustment bolts 6, put the three sleeve elongation adjustment bolts 5 into the corresponding holes of the clamping flange 3, and screw them into the corresponding threaded holes on the upper part of the sleeve, and continue to screw in the three sleeve elongation adjustment bolts 5. The upper part 1 of the sleeve will move upward under tension and compress the sleeve elongation sealing ring 8. The total length of the sleeve will be elongated, and the sleeve elongation sealing ring 8 will play a sealing role.

[0046] The present invention designs the traditional integral sleeve into a separate sleeve upper and lower part, and the axial position of the sleeve upper part can be adjusted within a certain range, so that the sleeve length will also change accordingly, realizing a small amount of adjustment of the overall extension and shortening of the sleeve. When the sleeve upper part moves axially, the sealing performance of the sleeve under the bidirectional length adjustment of extension and shortening can be ensured by compressing different sealing rings.

[0047] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0049] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A sealing sleeve with bidirectional fine-tuning length, characterized in that: The sleeve comprises an upper sleeve portion (1) and a lower sleeve portion (2); a convex edge (11) is formed at the bottom end of the upper sleeve portion (1); the lower sleeve portion (2) is a stepped tube structure consisting of a small-diameter inner wall tube (21) and a large-diameter outer wall tube (22); the convex edge (11) is embedded in the inner cavity of the outer wall tube (22), and a sleeve extension sealing ring (8) and a sleeve shortening sealing ring (9) are respectively arranged on the upper and lower end surfaces thereof; a clamping flange (3) is sleeved on the outside of the upper sleeve portion (1), and the clamping flange (3) is fixedly connected to the outer wall tube (22) via a plurality of clamping bolts (4), and is connected to the convex edge (11) via a plurality of sleeve extension adjustment bolts (5), and a plurality of sleeve shortening adjustment bolts (6) are also arranged on the clamping flange (3); An annular groove is formed on the end surface of the outer wall tube (22), and a flange sealing ring (7) is arranged in the annular groove; The annular groove is arranged on the inner side of the circle where the clamping bolt (4) is located; The convex edge (11) forms a threaded hole at a position corresponding to the sleeve extension adjustment bolt (5), and forms a shallow groove at a position corresponding to the sleeve shortening adjustment bolt (6); The bottom end of the sleeve shortening adjustment bolt (6) can contact the top surface of the convex edge (11).

2. The sealing sleeve with bidirectional fine-adjustable length according to claim 1, characterized in that: The outer diameter of the convex edge (11) matches the inner diameter of the outer wall tube (22).

3. The sealing sleeve with bidirectional fine-adjustable length according to claim 1, characterized in that: The sleeve upper part (1) and the sleeve lower part (2) are coaxial.

4. The sealing sleeve with bidirectional fine-adjustable length according to claim 1, characterized in that: The inner diameter of the sleeve upper portion (1) is the same as the inner diameter of the inner wall tube (21), and the outer diameter of the outer wall tube (22) is the same as the outer diameter of the clamping flange (3).

5. The sealing sleeve with bidirectional fine-adjustable length according to claim 1, characterized in that: A groove is formed on the bottom surface of the clamping flange (3), and the inner diameter of the groove is the same as the inner diameter of the outer wall tube (22).

6. The sealing sleeve with bidirectional fine-adjustable length according to claim 1, characterized in that: The plurality of clamping bolts (4), sleeve extension adjustment bolts (5) and sleeve shortening adjustment bolts (6) are evenly distributed along the circumference, and the sleeve extension adjustment bolts (5), sleeve shortening adjustment bolts (6) and clamping bolts (4) are distributed in sequence from the inside to the outside.

Images