Shaft sleeve sealing structure of steam seal oil

Abstract

The utility model relates to a shaft sleeve sealing structure of steam seal oil. The device comprises a fixed oil sealing shaft sleeve which is provided with a central cavity; the movable oil sealing shaft sleeve is rotationally connected into the center cavity, a reserved gap is formed between the movable oil sealing shaft sleeve and the center cavity, the movable oil sealing shaft sleeve comprises a body and an airflow guiding structure extending outwards in the radial direction of the body, and the airflow guiding structure is provided with a guiding inclined face; the reserved gap comprises a first radial gap formed between the movable oil sealing shaft sleeve and the central cavity and an axial gap formed between the airflow guide structure and the central cavity, and the radial gap is communicated with the axial gap; the sealing ring is arranged between the outer side wall of the body and the inner side wall of the center cavity, and a second radial gap capable of being communicated with the first radial gap is formed between the sealing ring and the movable oil sealing shaft sleeve. The oil seal can effectively prevent leakage of oil gas and oil drops, and the oil seal effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical shaft seals, in particular to a shaft sleeve sealing structure for steam seal oil. Background Art

[0002] Sealing between moving and stationary parts has always been a major challenge in production, particularly in rotating machinery. This type of equipment is widely used in various industries, including machinery manufacturing, petrochemicals, and metallurgy. Seal failure often leads to "three leaks"—oil, water, and air—which not only severely impact equipment efficiency but also exacerbate wear and aging, ultimately shortening its service life.

[0003] Currently, common sealing devices typically utilize oil seals and mechanical seals. These seals are used to prevent leakage between moving and stationary components, particularly between rotating workpieces and fixed parts. However, in complex operating environments, oil vapor and oil droplets often form and leak under the high temperatures, high pressures, and high-speed conditions of equipment. Oil vapor often leaks before oil droplets, leading to the loss of lubricant and spillage, which in turn affects the normal operation of the equipment. More seriously, these leaks not only waste resources, but also pollute the surrounding environment and increase maintenance costs.

[0004] Furthermore, shaft seals are a common sealing method, particularly in equipment such as rotary pumps. Their primary function is to prevent leakage of media between the rotating pump shaft and the pump body. However, existing shaft seal designs often fail to effectively prevent oil and gas leakage under high speed, high temperature, and high pressure operating conditions. As the equipment operates for extended periods of time, seal wear increases, further increasing the risk of leakage. Summary of the Invention

[0005] To this end, the utility model provides a shaft sleeve sealing structure for steam seal oil, which can effectively prevent the leakage of oil vapor and oil droplets and improve the oil sealing effect.

[0006] In order to solve the above technical problems, the utility model provides a shaft sleeve sealing structure for steam seal oil, comprising:

[0007] The fixed oil sealing sleeve is provided with a central cavity;

[0008] a movable oil-sealing sleeve, rotatably connected to the central cavity and having a reserved gap between the sleeve and the central cavity; the movable oil-sealing sleeve comprising a body and an airflow guiding structure extending radially outward from the body, the airflow guiding structure being provided with a guiding inclined surface; wherein the reserved gap comprises a first radial gap formed between the movable oil-sealing sleeve and the central cavity and an axial gap formed between the airflow guiding structure and the central cavity, the first radial gap being in communication with the axial gap;

[0009] a sealing ring disposed between the outer wall of the body and the inner wall of the central cavity, wherein a second radial gap communicating with the first radial gap is formed between the sealing ring and the movable oil sealing sleeve;

[0010] When the movable oil sealing sleeve rotates, the air flow can flow to the axial gap through the guiding inclined surface, and flow to the second radial gap through the first radial gap, so that a vacuum is generated in the second radial gap.

[0011] In one embodiment of the present invention, the central cavity includes a connected large diameter section and a small diameter section, a radial transition surface is formed between the large diameter section and the small diameter section, the airflow guiding structure extends into the large diameter section, and the airflow guiding structure includes a radial plane parallel to the radial transition surface.

[0012] In one embodiment of the present invention, the included angle between the radial plane and the guiding inclined surface is 5° to 25°.

[0013] In one embodiment of the present invention, a first inclined surface is formed between the inner wall of the small diameter section and the radial transition surface, and a second inclined surface parallel to the first inclined surface is formed between the portion of the body located in the small diameter section and the airflow guiding structure.

[0014] In one embodiment of the present invention, the portion of the body located in the large diameter section further includes an outer bevel connected to the guide bevel, and the outer bevel is outwardly cut along the direction of the guide bevel and obliquely to the axis of the movable oil sealing sleeve.

[0015] In one embodiment of the present invention, the body is radially provided with an annular groove for accommodating the sealing ring.

[0016] In one embodiment of the present invention, the second radial gap is between 0.2 mm and 0.35 mm.

[0017] In one embodiment of the present invention, the reserved gap is less than 0.3 mm.

[0018] The above technical solution of the utility model has the following advantages compared with the prior art:

[0019] The utility model discloses a shaft sleeve sealing structure for steam seal oil, which has a simple structure. By arranging an airflow guiding structure, the airflow is guided into the axial gap, so that a vacuum is formed in the second radial gap, which can effectively prevent the leakage of oil gas and oil droplets, and is suitable for high-speed rotating equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0021] Figure 1 The utility model is a structural diagram of a shaft sleeve sealing structure of a steam seal oil.

[0022] Description of the accompanying drawings:

[0023] 1. Fixed oil-sealing sleeve; 11. Central cavity; 111. Large diameter section; 112. Small diameter section; 113. Radial transition surface; 114. First inclined surface;

[0024] 2. Movable oil-sealing sleeve; 21. Main body; 211. Second inclined surface; 212. Outer inclined surface; 213. Annular groove; 22. Reserved gap; 221. First radial gap; 222. Axial gap; 23. Airflow guiding structure; 231. Guide inclined surface; 232. Radial plane;

[0025] 3. Sealing ring; 31. Second radial gap. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0027] In the present invention, if there is a description of directions (up, down, left, right, front and back), it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0028] In this utility model, "several" means one or more, "multiple" means more than two, "greater than," "less than," "exceeds," etc. are understood to exclude the number itself; "above," "below," "within," etc. are understood to include the number itself. In the description of this utility model, the use of "first" or "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0029] In this utility model, unless otherwise expressly defined, terms such as "disposed," "installed," and "connected" should be interpreted broadly. For example, they may refer to direct connection or indirect connection through an intermediate medium; fixed connection or detachable connection or integral molding; mechanical connection or electrical connection or mutual communication; and internal connection between two components or interaction between two components. Those skilled in the art can reasonably determine the specific meanings of these terms in this utility model based on the specific content of the technical solution.

[0030] Reference Figure 1 As shown, the utility model is a shaft sleeve sealing structure for steam seal oil, comprising:

[0031] The fixed oil sealing sleeve 1 is provided with a central cavity 11 and is generally fixed to the housing during operation and does not rotate;

[0032] A movable oil-sealing sleeve 2 is rotatably connected to the central cavity 11 and has a reserved gap 22 between it and the central cavity 11. The movable oil-sealing sleeve 2 includes a body 21 and an airflow guiding structure 23 extending radially outward from the body 21. The airflow guiding structure 23 is provided with a guiding slope 231. The reserved gap 22 includes a first radial gap 221 formed between the movable oil-sealing sleeve 2 and the central cavity 11 and an axial gap 222 formed between the airflow guiding structure 23 and the central cavity 11. The first radial gap 31 is connected to the axial gap 222.

[0033] A sealing ring 3 is provided between the outer wall of the body 21 and the inner wall of the central cavity 11, and a second radial gap 31 is formed between the sealing ring 3 and the movable oil sealing sleeve 2, which can communicate with the first radial gap 221;

[0034] When the movable oil-sealing sleeve 2 rotates, airflow can flow to the axial gap 222 through the guiding inclined surface 231 , and flow to the second radial gap 31 through the first radial gap 221 , so that a vacuum is generated in the second radial gap 31 .

[0035] It can be understood that the movable oil sealing sleeve 2 is sleeved on the rotating part (such as the pump shaft). The movable oil sealing sleeve 2 is connected to the fixed oil sealing sleeve 1 through the sealing ring 3 and has no direct (physical) contact.

[0036] The movable oil-sealing sleeve 2 is equipped with an airflow guiding structure 23. The guiding slope 231 forces external air or airflow in a specific direction when the movable oil-sealing sleeve 2 rotates at high speed. After passing through the guiding slope 231 and entering the first radial gap 221 and the second radial gap 31, the airflow is compressed due to the high-speed rotation and the guiding structure, creating a low-pressure (vacuum) environment within the second radial gap 31. The external atmospheric pressure or the pressure inside the equipment is higher than this, thus preventing the lubricant and oil vapor from escaping through this area.

[0037] Specifically, the central cavity 11 includes a connected large diameter section 111 and a small diameter section 112, a radial transition surface 113 is formed between the large diameter section 111 and the small diameter section 112, and the airflow guiding structure 23 extends into the large diameter section 111, and the airflow guiding structure 23 includes a radial plane 232 parallel to the radial transition surface 113.

[0038] Specifically, the included angle between the radial plane 232 and the guiding inclined surface 231 is 5° to 25°.

[0039] Specifically, a first inclined surface 114 is formed between the inner wall of the small-diameter section 112 and the radial transition surface 113 , and a second inclined surface 211 parallel to the first inclined surface is formed between the portion of the body 21 located in the small-diameter section 112 and the airflow guiding structure 23 .

[0040] Specifically, the body 21 further includes an outer bevel 212 connected to the guide bevel 231 in the portion located within the large diameter section 111 . The outer bevel 212 is outwardly cut along the direction of the guide bevel 231 and is oblique to the axis of the movable oil-sealing sleeve 2 .

[0041] Specifically, the body 21 is radially provided with an annular groove 213 for accommodating the sealing ring 3 .

[0042] Specifically, the second radial gap 31 is between 0.2 mm and 0.35 mm.

[0043] Specifically, the reserved gap 22 is smaller than 0.3 mm.

[0044] Working principle: An airflow guide structure 23 is provided on the movable oil-sealing sleeve 2. The structure extends radially outward along the body 21 and has a guiding slope 231. When the rotating part rotates at high speed (above 5000r / s), the airflow moves radially from the center position, passes through the guiding slope 231, and compresses the vacuum area of ​​the air sealing oil at the inner wall of the second radial gap between the movable oil-sealing sleeve 2 and the sealing ring 3. When the lubricating oil and oil gas flowing out in the positive direction pass through the sealing ring 3, the vacuum gap of 0.2~0.35mm is blocked, thereby achieving the effect of air sealing oil.

[0045] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to examples, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A shaft sleeve sealing structure for steam seal oil, characterized in that: include: A fixed oil sealing sleeve (1) is provided with a central cavity (11); A movable oil-sealing sleeve (2) is rotatably connected to the central cavity (11) and a reserved gap (22) is provided between the movable oil-sealing sleeve (2) and the central cavity (11). The movable oil-sealing sleeve (2) comprises a body (21) and an airflow guiding structure (23) extending radially outward from the body (21). The airflow guiding structure (23) is provided with a guiding inclined surface (231). The reserved gap (22) comprises a first radial gap (221) formed between the movable oil-sealing sleeve (2) and the central cavity (11) and an axial gap (222) formed between the airflow guiding structure (23) and the central cavity (11). The first radial gap (221) is connected to the axial gap (222). A sealing ring (3) is disposed between the outer wall of the body (21) and the inner wall of the central cavity (11), and a second radial gap (31) is formed between the sealing ring (3) and the movable oil-sealing sleeve (2) and is communicable with the first radial gap (221); When the movable oil-sealing sleeve (2) rotates, the airflow can flow toward the axial gap (222) through the guiding inclined surface (231), and flow toward the second radial gap (31) through the first radial gap (221), so that a vacuum is generated in the second radial gap (31).

2. The shaft sleeve sealing structure of the steam seal oil according to claim 1, characterized in that: The central cavity (11) comprises a large diameter section (111) and a small diameter section (112) connected to each other, a radial transition surface (113) being formed between the large diameter section (111) and the small diameter section (112), the airflow guiding structure (23) extending within the large diameter section (111), and the airflow guiding structure (23) comprising a radial plane (232) parallel to the radial transition surface (113).

3. The shaft sleeve sealing structure of the steam seal oil according to claim 2, characterized in that: The included angle between the radial plane (232) and the guiding inclined surface (231) is between 5° and 25°.

4. The shaft sleeve sealing structure of the steam seal oil according to claim 2, characterized in that: A first inclined surface (114) is formed between the inner wall of the small-diameter section (112) and the radial transition surface (113), and a second inclined surface (211) parallel to the first inclined surface (114) is formed between a portion of the body (21) located within the small-diameter section (112) and the airflow guiding structure (23).

5. The shaft sleeve sealing structure of the steam seal oil according to claim 2, characterized in that: The portion of the body (21) located within the large diameter section (111) further includes an outer bevel (212) connected to the guide bevel (231), and the outer bevel (212) is tangentially inclined to the axis of the movable oil-sealing sleeve (2) in the direction of the guide bevel (231).

6. The shaft sleeve sealing structure of the steam seal oil according to claim 1, characterized in that: The body (21) is radially provided with an annular groove (213) for accommodating the sealing ring (3).

7. The shaft sleeve sealing structure of the steam seal oil according to claim 1, characterized in that: The second radial gap (31) is between 0.2 mm and 0.35 mm.

8. The shaft sleeve sealing structure of the steam seal oil according to claim 1, characterized in that: The reserved gap (22) is less than 0.3 mm.

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