Sealing structure of mechanical fusion machine

Abstract

The utility model relates to the technical field of mechanical fusion machines, in particular to a sealing structure of a mechanical fusion machine, the sealing structure is arranged between a main shaft and an end cover of the mechanical fusion machine, the end cover is provided with a sealing cavity surrounding the main shaft, and the sealing structure is arranged in the sealing cavity; the sealing structure comprises a first sealing assembly and a second sealing assembly which are arranged in a spaced mode, a gap between the first sealing assembly and the second sealing assembly forms an air sealing cavity, an air channel communicated with the air sealing cavity is formed in the end cover, the first sealing assembly is located on the side, close to the cylinder, of the sealing cavity, and the second sealing assembly is located on the side, away from the cylinder, of the sealing cavity. The first sealing assembly comprises a first check ring and a first sealing piece, and through the design that the first sealing assembly is separated from the second sealing assembly on the powder side, the dual functions of powder blocking and lubricating oil leakage prevention are achieved.

Description

Technical Field

[0001] This utility model relates to the field of mechanical fusion machine technology, and in particular to a sealing structure for a mechanical fusion machine. Background Technology

[0002] Mechanical fusion machines are widely used in powder processing, alloy preparation, and other fields. The sealing structure between the main shaft and the end cover must withstand harsh conditions such as high-speed rotation, high temperature, high pressure, and powder intrusion. Traditional sealing structures mostly use single lip seals or packing seals, which have the following drawbacks: powder easily intrudes into the angular gap between the lip of the seal and the main shaft, thereby accelerating the wear and failure of the seal and resulting in a short replacement cycle; and powder is prone to leakage under high-speed rotation, polluting the working environment. Utility Model Content

[0003] The technical problem to be solved by this utility model is: in order to overcome the following defects in the existing sealing structures, which mostly use single lip seals or packing seals, such as powder easily intruding into the bearing cavity and causing lubrication failure; and lubricant easily leaking and contaminating materials under high-speed rotation, a sealing structure for a mechanical fusion machine is provided.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a sealing structure for a mechanical fusion machine, wherein the sealing structure is arranged between the main shaft and the end cover of the mechanical fusion machine, and a sealing cavity surrounding the main shaft is opened on the end cover, and the sealing structure is arranged in the sealing cavity;

[0005] The sealing structure includes a first sealing component and a second sealing component arranged at intervals. The gap between the first sealing component and the second sealing component forms an air-sealing cavity. An air passage communicating with the air-sealing cavity is provided on the end cap. The first sealing component is located on the side of the sealing cavity closer to the cylinder, and the second sealing component is located on the side of the sealing cavity farther from the cylinder. The first sealing component includes a first retaining ring and a first sealing element. The first sealing element and the cavity wall on the side of the sealing cavity closer to the cylinder clamp the first retaining ring. Through the separation design of the first sealing component on the powder side and the second sealing component, the dual functions of powder barrier and lubricating oil leakage prevention are achieved. Compressed gas is introduced into the air-sealing cavity to form a positive pressure barrier, which effectively prevents bidirectional media penetration.

[0006] To address the issue of low rejection rate of ordinary lip seals for ultrafine powders, the system further includes a first lip and a second lip arranged at intervals on the inner ring of the first sealing element. The first lip and the first sealing element constitute a single V-shaped seal, and the second lip and the first sealing element constitute a double V-shaped seal.

[0007] To address the issue of media penetration caused by improper deflection of the sealing lip, the design further includes deflecting both the first and second lips towards the side closer to the cylinder.

[0008] To address the issue of misalignment failure during the assembly of multiple oil seal components, a second sealing assembly is further included, comprising an oil seal retaining ring, a first oil seal, a spacer, and a second oil seal. The second oil seal contacts the cavity wall on the side of the sealing cavity away from the cylinder body. The spacer is located between the first and second oil seal components, and the second oil seal is located between the spacer and the oil seal retaining ring.

[0009] To address the issue of seal failure caused by direct spindle wear, a further improvement is made by installing a wear-resistant sleeve on the spindle, with the sealing structure positioned between the wear-resistant sleeve and the end cap.

[0010] The beneficial effects of this utility model are as follows: The sealing structure of the mechanical fusion machine provided by this utility model achieves the dual functions of powder isolation and lubricant leakage prevention through the separation design of the first sealing component and the second sealing component on the powder side; the gas sealing cavity is filled with compressed gas to form a positive pressure barrier, which effectively prevents bidirectional media penetration. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a utility model Figure 1 A magnified structural diagram of point A in the middle.

[0014] In the figure: 1. Main shaft, 11. Wear-resistant sleeve, 2. End cover, 21. Sealing cavity, 22. Air passage, 3. First sealing assembly, 31. First retaining ring, 32. First seal, 321. First lip, 322. Second lip, 4. Second sealing assembly, 41. Oil seal retaining ring, 42. First oil seal, 43. Spacer ring, 44. Second oil seal, 5. Air seal cavity, 6. Cylinder. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0016] like Figure 1 This is a schematic diagram of the structure of the present invention, a sealing structure of a mechanical fusion machine. The sealing structure is arranged between the main shaft 1 and the end cover 2 of the mechanical fusion machine. The end cover 2 has a sealing cavity 21 surrounding the main shaft 1, and the sealing structure is arranged in the sealing cavity 21.

[0017] like Figure 2As shown, the sealing structure includes a first sealing component 3 and a second sealing component 4 arranged at intervals. The gap between the first sealing component 3 and the second sealing component 4 forms an air-sealing cavity 5. An air passage 22 communicating with the air-sealing cavity 5 is provided on the end cap 2. The first sealing component 3 is located on the side of the sealing cavity 21 closer to the cylinder body, and the second sealing component 4 is located on the side of the sealing cavity 21 away from the cylinder body 6. The first sealing component 3 includes a first retaining ring 31 and a first sealing element 32. The first sealing element 32 and the cavity wall of the sealing cavity 21 on the side closer to the cylinder body 6 clamp the first retaining ring 31. Through the separation design of the first sealing component 3 and the second sealing component 4 on the powder side, the dual functions of powder barrier and lubricating oil leakage prevention are achieved. The air-sealing cavity 5 is filled with compressed gas to form a positive pressure barrier, which effectively prevents bidirectional media penetration.

[0018] like Figure 2 As shown, the inner ring of the first sealing element 32 is provided with a first lip 321 and a second lip 322 at intervals. The first lip 321 and the first sealing element 32 form a first V-shaped seal, and the second lip 322 and the first sealing element 32 form a second V-shaped seal. The double V-shaped lips of the first sealing element 32 form a multi-level seal, which has a high rejection rate for micron-sized powders, and the double V-shaped lips form a labyrinth-like interception channel, which improves the dustproof level.

[0019] like Figure 2 As shown, both the first lip 321 and the second lip 322 are deflected toward the side closer to the cylinder 6. The specific deflection angle enhances the pumping effect and reduces the lip wear rate.

[0020] like Figure 2 As shown, the second sealing assembly 4 includes an oil seal retaining ring 41, a first oil seal 42, a spacer ring 43, and a second oil seal 44. The second oil seal 44 contacts the cavity wall of the sealing cavity 21 on the side away from the cylinder 6. The spacer ring 43 is located at the junction of the first oil seal 42 and the second oil seal 44. The second oil seal 44 is located between the spacer ring 43 and the oil seal retaining ring 41. The spacer ring 43 is designed to allow a lubricating film to form between the oil seals, reducing frictional temperature rise.

[0021] Common materials for the first oil seal 42 and the second oil seal 44 include: nitrile rubber, fluororubber, silicone rubber, acrylic rubber, polyurethane, polytetrafluoroethylene, etc.; the spacer 43 is a hollow ring made of polyether ether ketone (PEEK) with oil-guiding microgrooves on its surface; the oil seal retainer 41 can be a split brass ring with a mounting groove on its end face to fix the axial position of the first oil seal and compensate for thermal deformation displacement.

[0022] like Figure 1 , 2 As shown, a wear-resistant sleeve 11 is installed on the spindle 1. This sealing structure is arranged between the wear-resistant sleeve 11 and the end cover 2. The wear-resistant sleeve converts the direct friction between the spindle and the seal into wear of the replaceable sleeve, thus extending the spindle life.

[0023] Working process: When the main shaft rotates, the powder flying inside the cylinder is blocked by the first baffle ring 31, which forms the first sealing barrier. A small amount of dispersed powder will be blocked by the double V-shaped lips (first lip 321 and second lip 322) of the first sealing component 3 after passing through the first baffle ring 31. The pumping effect generated by the deflection direction of the lips of the first sealing component 3 will push the powder back into the cavity in the opposite direction, and the powder is difficult to enter the angular gap between the lips (first lip 321 and second lip 322) and the main shaft 1.

[0024] Clean compressed air is continuously injected into the air-sealing cavity 5 through the air passage to form a positive pressure air curtain, which blocks the penetration of residual powder and inhibits the diffusion of powder. In the second sealing assembly 4, the main lip of the first oil seal 42 faces the lubricating oil side and is tightly attached to the surface of the wear-resistant sleeve under the action of centrifugal force. The second oil seal 44 prevents external contaminants from entering and internal oil from leaking out. The elastic deformation of the spacer 43 absorbs the axial expansion of the oil seals (first oil seal 42 and second oil seal 44) due to temperature rise, and maintains a constant pressing force on the sealing surface.

[0025] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A sealing structure for a mechanical fusion machine, characterized in that, The sealing structure is arranged between the main shaft (1) and the end cover (2) of the mechanical fusion machine. The end cover (2) has a sealing cavity (21) surrounding the main shaft (1), and the sealing structure is arranged inside the sealing cavity (21). The sealing structure includes a first sealing component (3) and a second sealing component (4) arranged at intervals. The gap between the first sealing component (3) and the second sealing component (4) forms an air seal cavity (5). An air passage (22) communicating with the air seal cavity (5) is provided on the end cap (2). The first sealing component (3) is located on the side of the sealing cavity (21) close to the cylinder (6), and the second sealing component (4) is located on the side of the sealing cavity (21) away from the cylinder (6). The first sealing component (3) includes a first retaining ring (31) and a first sealing element (32). The first sealing element (32) and the cavity wall of the sealing cavity (21) close to the cylinder (6) clamp the first retaining ring (31).

2. The sealing structure of a mechanical fusion machine as described in claim 1, characterized in that: The inner ring of the first seal (32) is provided with a first lip (321) and a second lip (322) at intervals. The first lip (321) and the first seal (32) form a first V-shaped seal, and the second lip (322) and the first seal (32) form a second V-shaped seal.

3. The sealing structure of a mechanical fusion machine as described in claim 2, characterized in that: The first lip (321) and the second lip (322) are both deflected toward the side closer to the cylinder (6).

4. The sealing structure of a mechanical fusion machine as described in claim 1, characterized in that: The second sealing assembly (4) includes an oil seal retaining ring (41), a first oil seal (42), a spacer (43), and a second oil seal (44). The second oil seal (44) contacts the cavity wall of the sealing cavity (21) on the side away from the cylinder (6). The spacer (43) is located between the first oil seal (42) and the second oil seal (44). The second oil seal (44) is located between the spacer (43) and the oil seal retaining ring (41).

5. The sealing structure of a mechanical fusion machine as described in claim 1, characterized in that: A wear-resistant sleeve (11) is installed on the main shaft (1), and the sealing structure is arranged between the wear-resistant sleeve (11) and the end cap (2).

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