A guide vane sleeve structure

Abstract

The utility model relates to the technical field of guide vane cover, specifically disclose a guide vane cover structure, including the cover, the cover is cylindrical structure, its outer wall is used for interference fit pressure equipment in the shell mounting hole, still include with the inner bushing of coaxial setting of cover, the inner hole of inner bushing is used for the lead vane axle, the inner wall of cover and inner bushing between be provided with sealing structure, still be provided with the circumferential positioning structure of one side of sealing structure between cover and inner bushing, through with the split type structure that guide vane cover is arranged, the cover mainly plays the role of support and installation, can adopt the metal material of lower cost, inner bushing directly with the lead vane axle contact, adopt high wear -resisting, self -lubricating non -metal or special alloy material, this structure realizes the optimized configuration of material performance, guarantees wear resistance at the same time, significantly reduced manufacturing cost.

Description

Technical Field

[0001] This utility model relates to the field of guide vane sleeve technology, and specifically discloses a guide vane sleeve structure. Background Technology

[0002] Guide vane sleeves are key components of adjustable guide vane mechanisms in equipment such as centrifugal compressors. They are fixedly mounted on the equipment casing, with the guide vane shaft passing through the inner hole of the sleeve and driven to rotate by an actuator to change the guide vane angle, thereby regulating gas flow and pressure. The guide vane sleeve not only supports the guide vane shaft but also effectively prevents high-pressure gas leakage from the gap between the guide vane shaft and the casing mounting hole.

[0003] Existing guide vane sleeves mostly adopt an integral structure. During adjustment, the guide vane shaft needs frequent rotation, leading to frictional wear between the inner wall of the guide vane sleeve and the guide vane shaft. Integral guide vane sleeves are typically made of a single material (such as copper alloy or stainless steel). Using a highly wear-resistant material for the entire sleeve is costly, while using ordinary materials results in easy wear of the inner bore, leading to increased clearance and seal failure. Furthermore, traditional guide vane sleeves usually rely solely on a small fit clearance between the guide vane shaft and the inner bore, or a simple O-ring, for sealing. This is prone to leakage under high-pressure conditions, resulting in unsatisfactory sealing performance. Therefore, a new guide vane sleeve structure is needed to solve this problem. Utility Model Content

[0004] This utility model proposes a guide vane sleeve structure. By setting the guide vane sleeve as a split structure, it is easy to maintain, has multiple sealing effects, and ensures the stability and reliability of the structure.

[0005] This utility model is implemented as follows: a guide vane sleeve structure includes an outer sleeve, which is a cylindrical structure, and its outer wall is used for interference fit press-fitting into the mounting hole of the equipment housing. It also includes an inner bushing arranged coaxially with the outer sleeve. The inner hole of the inner bushing is used for passing through the guide vane shaft. A sealing structure is provided between the inner wall of the outer sleeve and the inner bushing. A circumferential positioning structure located on one side of the sealing structure is also provided between the outer sleeve and the inner bushing. The sealing structure includes a first annular sealing groove formed on the inner wall of the outer sleeve and a second annular sealing groove located on one side of the first annular sealing groove, as well as a main sealing element embedded in the first annular sealing groove and an auxiliary sealing element embedded in the second annular sealing groove. The circumferential positioning structure includes two positioning pin holes on the outer wall of the outer sleeve, two anti-rotation grooves on the outer wall of the inner sleeve, and positioning pins that pass through the positioning pin holes and are engaged in the anti-rotation grooves.

[0006] In a preferred embodiment of the guide vane sleeve structure of this utility model, the main sealing element is an elastic sealing ring with a "U" shaped cross-section, and the auxiliary sealing element is a polytetrafluoroethylene sealing ring with an "O" shaped cross-section.

[0007] As a preferred embodiment of the guide vane sleeve structure of this utility model, the inner wall of the inner liner is provided with an oil storage groove.

[0008] As a preferred embodiment of the guide vane sleeve structure of this utility model, the outer wall of the inner liner sleeve is provided with a process threaded hole for easy disassembly and assembly.

[0009] As a preferred embodiment of the guide vane sleeve structure of this utility model, the inner liner has a stepped shaft shape, and the large-diameter section and the inner hole of the outer sleeve are fitted with a clearance or transition fit.

[0010] As a preferred embodiment of the guide vane sleeve structure of this utility model, the inner liner is made of self-lubricating and wear-resistant engineering plastic.

[0011] As a preferred embodiment of the guide vane sleeve structure of this utility model, the outer sleeve is made of metal material.

[0012] The beneficial effects of this utility model are: By setting the guide vane sleeve as a split structure, the outer sleeve mainly serves as a support and installation material and can be made of low-cost metal materials, while the inner sleeve directly contacts the guide vane shaft and is made of highly wear-resistant, self-lubricating non-metallic or special alloy materials. This structure achieves optimized configuration of material properties, significantly reducing manufacturing costs while ensuring wear resistance. With a dual sealing structure of "main seal + auxiliary seal", the main seal self-tightens under medium pressure, and the auxiliary seal serves as a backup, effectively avoiding leakage problems caused by the failure of a single seal, thereby improving the seal life. The combination of locating pins and anti-rotation grooves effectively prevents circumferential displacement of the inner liner when the guide vane shaft rotates, ensuring the stability and reliability of the structure. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0014] Figure 1 This is an overall structural diagram of a guide vane sleeve structure according to the present invention.

[0015] Figure 2 This is a front sectional view of a guide vane sleeve structure according to the present invention.

[0016] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A.

[0017] The markings in the diagram are: 1. Outer sleeve; 101. Locating pin hole; 2. Inner bushing; 201. Anti-rotation groove; 202. Oil reservoir; 203. Threaded hole; 3. First annular sealing groove; 301. Main seal; 4. Second annular sealing groove; 401. Auxiliary seal; 5. Locating pin. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0019] Please see Figure 1-3 A guide vane sleeve structure includes an outer sleeve 1, which is a cylindrical structure. Its outer wall is used for interference fit press-fitting into the mounting hole of the equipment housing. It also includes an inner bushing 2 coaxially arranged with the outer sleeve 1. The inner hole of the inner bushing 2 is used for the guide vane shaft to pass through. A sealing structure is provided between the inner wall of the outer sleeve 1 and the inner bushing 2. A circumferential positioning structure located on one side of the sealing structure is also provided between the outer sleeve 1 and the inner bushing 2. The sealing structure includes a first annular sealing groove 3 formed on the inner wall of the outer sleeve 1 and a second annular sealing groove 4 located on one side of the first annular sealing groove 3, a main sealing member 301 embedded in the first annular sealing groove 3, and an auxiliary sealing member 401 embedded in the second annular sealing groove 4. The circumferential positioning structure includes two positioning pin holes 101 on the outer wall of the outer sleeve 1, two anti-rotation grooves 201 on the outer wall of the inner sleeve 2, and positioning pins 5 that pass through the positioning pin holes 101 and are engaged in the anti-rotation grooves 201.

[0020] In this embodiment: the guide vane sleeve is divided into an outer sleeve 1 and an inner sleeve 2. The outer sleeve 1 mainly serves as a support and installation material and can be made of low-cost metal material. The inner sleeve 2 is in direct contact with the guide vane shaft and is made of high wear-resistant, self-lubricating non-metallic or special alloy material. This structure achieves optimized configuration of material properties and significantly reduces manufacturing costs while ensuring wear resistance. With the dual sealing structure of "main seal 301 + auxiliary seal 401", the main seal 301 self-tightens under the medium pressure, and the auxiliary seal 401 serves as a backup, effectively avoiding leakage problems caused by the failure of a single seal, thereby improving the seal life. The locating pin 5 and the anti-rotation groove 201 work together to effectively prevent the inner liner 2 from circumferentially displacing when the guide vane shaft rotates, thus ensuring the stability and reliability of the structure.

[0021] As a technical optimization of this utility model, the main sealing element 301 is an elastic sealing ring with a "U" shaped cross section, and the auxiliary sealing element 401 is a polytetrafluoroethylene sealing ring with an "O" shaped cross section.

[0022] In this embodiment: the U-shaped elastic sealing ring, with its opening facing the fluid medium side, can fit against the sealing surface under the pressure of the medium, enhancing the sealing effect. The O-shaped polytetrafluoroethylene sealing ring has aging resistance and low friction characteristics, serving as a backup for the main seal 301 to prevent medium leakage when the main seal fails.

[0023] As a technical optimization of this utility model, the inner wall of the inner bushing 2 is provided with an oil storage groove 202.

[0024] In this embodiment, the oil reservoir 202 is used to store lubricating grease, which reduces the rotational resistance and wear of the guide vane shaft and extends the overall service life of the guide vane sleeve and guide vane shaft.

[0025] As a technical optimization of this utility model, the outer wall of the inner bushing 2 is provided with a process threaded hole 203 for easy disassembly and assembly.

[0026] In this embodiment: the process threaded hole 203 is used to facilitate the removal of the inner bushing 2 from the outer bushing 1 by means of a puller or screw during maintenance.

[0027] As a technical optimization of this utility model, the inner bushing 2 is stepped shaft-shaped, and the large diameter section and the inner hole of the outer bushing 1 are fitted with a clearance or transition fit.

[0028] In this embodiment: because the inner bushing 2 is stepped shaft-shaped, the inner bushing 2 can be easily embedded or pressed into the inner hole of the outer sleeve 1.

[0029] As a technical optimization of this utility model, the inner liner 2 is made of self-lubricating and wear-resistant engineering plastic.

[0030] In this embodiment: self-lubricating and wear-resistant materials, such as polyetheretherketone, have good self-lubricating and wear-resistant properties.

[0031] As a technical optimization of this utility model, the outer jacket 1 is made of metal material.

[0032] In this embodiment, the metal material, such as carbon steel or stainless steel, has high strength, rigidity and hardness. During the pressing process and long-term use, the outer jacket 1 will not deform or be damaged, and can maintain a tight and stable connection with the housing to prevent loosening.

[0033] The working principle and usage process of this utility model are as follows: First, the main sealing element 301 and the auxiliary sealing element 401 are respectively installed in the first annular sealing groove 3 and the second annular sealing groove 4 on the inner wall of the outer sleeve 1. Then, the inner bushing 2 is pressed into the inner hole of the outer sleeve 1 in the correct direction (so that the anti-rotation groove 201 is aligned with the positioning pin hole 101). Finally, the positioning pin 5 is inserted into the positioning pin hole 101, and its end is inserted into the anti-rotation groove 201 of the inner bushing 2, thereby completing the assembly of the entire guide vane sleeve. Finally, the assembled guide vane sleeve is pressed into the mounting hole of the housing. The guide vane shaft passes through the inner hole of the inner bushing 2. When the actuator drives the guide vane shaft to rotate, the guide vane shaft rotates relative to the wear-resistant inner hole wall of the inner bushing 2. The main seal 301 and the auxiliary seal 401 ensure the static seal between the outer sleeve 1 and the inner bushing 2, while the precise fit between the inner bushing 2 and the guide vane shaft provides the dynamic seal. When the inner bushing 2 is worn, simply pull out the locating pin 5, use a tool to screw it into the process thread hole 203 to pull out the old inner bushing 2, replace it with a new inner bushing 2, and reinsert the locating pin 5. There is no need to disturb the outer sleeve 1 and the machine housing. The replacement operation is simple and quick, which greatly shortens the equipment downtime.

[0034] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A guide vane sleeve structure, comprising an outer sleeve (1), wherein the outer sleeve (1) is a cylindrical structure, and its outer wall is used for interference fit press-fitting into the mounting hole of the equipment housing, characterized in that: It also includes an inner bushing (2) coaxially arranged with the outer sleeve (1); the inner hole of the inner bushing (2) is used to pass through the guide vane shaft, a sealing structure is provided between the inner wall of the outer sleeve (1) and the inner bushing (2), and a circumferential positioning structure located on one side of the sealing structure is also provided between the outer sleeve (1) and the inner bushing (2). The sealing structure includes a first annular sealing groove (3) opened on the inner wall of the outer sleeve (1) and a second annular sealing groove (4) located on one side of the first annular sealing groove (3), a main sealing element (301) embedded in the first annular sealing groove (3), and an auxiliary sealing element (401) embedded in the second annular sealing groove (4). The circumferential positioning structure includes two positioning pin holes (101) on the outer wall of the outer sleeve (1), two anti-rotation grooves (201) on the outer wall of the inner liner (2), and a positioning pin (5) that passes through the positioning pin holes (101) and is engaged in the anti-rotation grooves (201).

2. The guide vane sleeve structure according to claim 1, characterized in that: The main seal (301) is an elastic sealing ring with a "U" shaped cross section, and the auxiliary seal (401) is a polytetrafluoroethylene sealing ring with an "O" shaped cross section.

3. The guide vane sleeve structure according to claim 1, characterized in that: The inner wall of the inner bushing (2) is provided with an oil storage groove (202).

4. The guide vane sleeve structure according to claim 1, characterized in that: The outer wall of the inner bushing (2) is provided with a process thread hole (203) for easy disassembly and assembly.

5. The guide vane sleeve structure according to claim 1, characterized in that: The inner bushing (2) has a stepped shaft shape, and the large diameter section is fitted with the inner hole of the outer bushing (1) with a clearance or transition fit.

6. The guide vane sleeve structure according to claim 1, characterized in that: The inner liner (2) is made of self-lubricating and wear-resistant engineering plastic.

7. The guide vane sleeve structure according to claim 1, characterized in that: The outer garment (1) is made of metal.

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