A double-seal structure for the bearing chamber of an air classifier

Abstract

This utility model discloses a double-seal structure for the bearing chamber of an air classifier, including a bearing chamber body, a mounting bracket, a first skeleton oil seal, a second skeleton oil seal, and a dustproof bushing. The mounting bracket is fixed to the inner cavity of the bearing chamber, where a bearing and a rotating shaft are installed. The first and second skeleton oil seals are sequentially installed on the rotating shaft, forming an inner active seal. The dustproof bushing is installed on the rotating shaft via an interference fit. The outer side of the bushing has first and second sealing grooves and is fitted with a PTFE gasket, which together form an outer labyrinth-type dustproof seal. In addition, an oil change inlet pipe and an oil change outlet pipe are provided, with their ports located between the bearing and the first skeleton oil seal, and between the first and second skeleton oil seals, respectively, enabling online lubrication maintenance without shutting down the machine. This utility model, through the dual combination of skeleton oil seals and labyrinth seals, significantly improves sealing reliability, effectively isolates dust, extends lubricating oil life, and ensures long-term stable operation of the air classifier in high-pressure dust environments.

Description

Technical Field

[0001] This utility model relates to the technical field of air classifier equipment, and more specifically, to a double-sealed structure for the bearing chamber of an air classifier. Background Technology

[0002] An air classifier is a key piece of equipment in the powder processing field that accurately classifies materials based on differences in the physical properties of particles, such as particle size, density, and shape. Its core function is to separate "finished powder" that meets specific particle size requirements from mixed powders, while sending coarse particles back to the grinding equipment for re-grinding. This optimizes the efficiency of the grinding system, controls the quality of the finished product, and reduces energy consumption. Since the shaft of the air classifier is in a dusty environment during operation, a good sealing environment is required for its bearing chamber to ensure the normal operation of the equipment.

[0003] The prior art discloses a bearing sealing structure for a classifier with application number CN202223015792.9. Although this utility model uses a first skeleton oil seal and a second skeleton oil seal to achieve sealing protection for the bearing, the two skeleton oil seals are still the same type of sealing protection. When the classifier is working, the powder is still easy to come into contact with the lubricating oil, causing contamination, affecting the service life of the lubricating oil, and also not conducive to the normal operation of the rotating shaft. Its practicality is relatively general. Therefore, those skilled in the art have proposed a double sealing structure for the bearing chamber of a classifier. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a double-sealed structure for the bearing chamber of a classifier. This structure utilizes an internal skeleton oil seal for active sealing and an external labyrinth seal for dust blocking and buffering, resulting in a more reliable sealing effect, ensuring long-term stable operation of the classifier, and enhancing its practicality. This solves the problems mentioned in the background technology.

[0005] To achieve the aforementioned dual-seal structure, which utilizes an internal skeleton oil seal for active sealing and an external labyrinth seal for dust blocking and buffering, resulting in a more reliable sealing effect, ensuring long-term stable operation of the air classifier, and offering greater practicality, the specific technical solution adopted by this utility model is as follows: A dual-seal structure for an air classifier bearing chamber includes a bearing chamber body, a mounting frame, a first skeleton oil seal, a second skeleton oil seal, and a dustproof bushing. The mounting frame is fixedly installed in the inner cavity of the bearing chamber, and a mounting bearing is fixedly installed in the inner cavity of the mounting frame. A rotating shaft is installed inside the mounting bearing. The first skeleton oil seal and the second skeleton oil seal are installed through the portion of the rotating shaft located within the inner cavity of the bearing chamber. The outer wall of the rotating shaft is in contact with the inner walls of the first and second skeleton oil seals. A dustproof bushing is interference-fitted onto the rotating shaft. The side wall of the dustproof bushing has a first sealing groove and a second sealing groove, respectively. A PTFE gasket is fitted onto the dustproof bushing.

[0006] Furthermore, an oil change inlet pipe is connected to one side of the inner cavity of the mounting bracket, and an oil change outlet pipe is connected to the other side of the inner cavity of the mounting bracket.

[0007] Furthermore, one port of the oil inlet pipe and the oil outlet pipe are both located between the mounting bearing and the first skeleton oil seal, and the other port of the oil inlet pipe and the oil outlet pipe are both located between the first skeleton oil seal and the second skeleton oil seal.

[0008] Furthermore, the central axes of the bearing housing, mounting bracket, mounting bearing, first skeleton oil seal, second skeleton oil seal, and dustproof bushing are on the same straight line.

[0009] Furthermore, the cross-sectional shape of the oil change inlet pipe and the oil change outlet pipe is an inverted F shape.

[0010] Furthermore, several fixing blocks are evenly welded to the four corners of the top of the bearing housing, and mounting bolts are installed on the fixing blocks.

[0011] Compared with the prior art, this utility model provides a double-sealed structure for the bearing chamber of a classifier, which has the following advantages: (1) This utility model is provided with a bearing housing, a mounting bracket, a first skeleton oil seal, a second skeleton oil seal and a dustproof bushing. It adopts a combination of skeleton oil seal and labyrinth seal. The first skeleton oil seal and the second skeleton oil seal on the inner side realize active lubrication and sealing. The labyrinth groove on the outer dustproof bushing and the PTFE pad form an efficient dustproof barrier, which greatly reduces the load on the main seal, significantly improves the sealing reliability and extends the service life of the lubricating oil.

[0012] (2) This utility model is equipped with an oil inlet pipe and an oil outlet pipe. With the independent oil inlet pipe and outlet pipe, the lubricating oil can be added and replaced directly without stopping the equipment, realizing online updating and maintenance of the lubrication system. The operation is simple and the maintenance efficiency is high. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of a double-seal structure for a classifier bearing chamber according to an embodiment of the present invention; Figure 2 According to the embodiments of this utility model Figure 1 Enlarged view of point A; Figure 3According to the embodiments of this utility model Figure 1 Enlarged view of point B; Figure 4 This is a perspective view of a dustproof bushing with a double-seal structure for the bearing chamber of a classifier according to an embodiment of the present utility model.

[0015] In the picture: 1. Bearing housing; 2. First skeleton oil seal; 3. Second skeleton oil seal; 4. Oil inlet pipe; 5. Fixed mounting block; 6. Bearing installation; 7. Mounting bracket; 8. Mounting bolts; 9. Oil outlet pipe; 10. PTFE gasket; 11. Dustproof bushing; 12. Rotating shaft; 13. First sealing groove; 14. Second sealing groove. Detailed Implementation

[0016] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0017] According to an embodiment of this utility model, a double-sealed structure for the bearing chamber of a classifier is provided.

[0018] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1-4 As shown, a double-sealed bearing chamber structure for a classifier according to an embodiment of the present invention includes a bearing chamber body 1, a mounting frame 7, a first skeleton oil seal 2, a second skeleton oil seal 3, and a dustproof bushing 11. The mounting frame 7 is fixedly installed in the inner cavity of the bearing chamber body 1, and a mounting bearing 6 is fixedly installed in the inner cavity of the mounting frame 7. A rotating shaft 12 is installed inside the mounting bearing 6. The first skeleton oil seal 2 and the second skeleton oil seal 3 are installed through the portion of the rotating shaft 12 located in the inner cavity of the bearing chamber body 1. The outer wall of the rotating shaft 12 is in contact with the inner wall of the first skeleton oil seal 2 and the second skeleton oil seal 3. A dustproof bushing 11 is interference-fitted on the rotating shaft 12. The side wall of the dustproof bushing 11 is respectively provided with a first sealing groove 13 and a second sealing groove 14. A PTFE gasket 10 is fitted onto the dustproof bushing 11.

[0019] It features a dual-seal structure that utilizes an internal skeleton oil seal for active sealing and an external labyrinth seal for dust blocking and buffering, resulting in a better and more reliable sealing effect, ensuring long-term stable operation of the air classifier, and making it more practical.

[0020] Please refer to Figure 1 and Figure 2 As shown, an oil change inlet pipe 4 is connected to one side of the inner cavity of the mounting bracket 7, and an oil change outlet pipe 9 is connected to the other side of the inner cavity of the mounting bracket 7.

[0021] It facilitates the user's pumping in or out of lubricating oil, allowing for the regular addition of new lubricating grease and removal of old lubricating grease to update the lubrication system, making lubrication maintenance more convenient and practical.

[0022] Please refer to Figure 1 One port of the oil inlet pipe 4 and the oil outlet pipe 9 are both located between the mounting bearing 6 and the first skeleton oil seal 2, and the other port of the oil inlet pipe 4 and the oil outlet pipe 9 are both located between the first skeleton oil seal 2 and the second skeleton oil seal 3.

[0023] Please refer to Figure 1 The central axes of the bearing housing 1, mounting bracket 7, bearing 6, first skeleton oil seal 2, second skeleton oil seal 3 and dustproof bushing 11 are on the same straight line.

[0024] Please refer to Figure 1 The cross-sectional shape of the oil change inlet pipe 4 and the oil change outlet pipe 9 is an inverted F shape.

[0025] Please refer to Figure 1 Several fixed mounting blocks 5 are evenly welded to the four corners of the top of the bearing housing 1, and mounting bolts 8 are installed on the fixed mounting blocks 5.

[0026] The bearing housing 1 can be fixedly installed on the classifier by using the fixed mounting block 5 and mounting bolts 8.

[0027] Working Principle: This utility model includes a bearing housing 1, a mounting bracket 7, a first skeleton oil seal 2, a second skeleton oil seal 3, and a dustproof bushing 11. The mounting bracket 7 is fixedly installed inside the bearing housing 1, and a mounting bearing 6 is fixedly installed inside the mounting bracket 7. A rotating shaft 12 is installed inside the mounting bearing 6. The rotating shaft 12, located within the inner cavity of the bearing housing 1, passes through and is fitted with the first skeleton oil seal 2 and the second skeleton oil seal 3. The outer wall of the rotating shaft 12 is in contact with the inner walls of the first skeleton oil seal 2 and the second skeleton oil seal 3. The rotating shaft 12 is secured by the elasticity of the rubber lip. The clamping force of the spring forms an extremely thin oil film on the rotating shaft 12, achieving dynamic sealing. A dustproof bushing 11 is interference-fitted onto the rotating shaft 12. The sidewalls of the dustproof bushing 11 are respectively provided with a first sealing groove 13 and a second sealing groove 14. A PTFE gasket 10 is fitted onto the dustproof bushing 11. The two sets of labyrinth seal structures formed by the first sealing groove 13 and the second sealing groove 14, combined with the isolation and sealing effect of the PTFE gasket 10, can greatly reduce the intrusion of dust during the operation of the classifier, and provide a relatively clean environment for the first lip seal. The buffer area greatly reduces the burden on the lip seal, extends the service life of the lubricating oil, and provides a better and more reliable sealing effect, ensuring the long-term stable operation of the air classifier and making it more practical. In addition, this utility model is equipped with fixed mounting blocks 5, mounting bolts 8, an oil change inlet pipe 4, and an oil change outlet pipe 9. Several fixed mounting blocks 5 are evenly welded to the four corners of the top of the bearing chamber 1. The bearing chamber 1 can be fixedly installed on the air classifier using the fixed mounting blocks 5 and mounting bolts 8. One side of the inner cavity of the mounting frame 7 is connected to the oil change inlet pipe 4, and the mounting frame 7... The other side of the inner cavity is connected to the oil change outlet pipe 9. One port of the oil change inlet pipe 4 and the oil change outlet pipe 9 are located between the mounting bearing 6 and the first skeleton oil seal 2, and the other port of the oil change inlet pipe 4 and the oil change outlet pipe 9 are located between the first skeleton oil seal 2 and the second skeleton oil seal 3. The inlet and outlet ends of the oil change inlet pipe 4 and the oil change outlet pipe 9 are located outside the air classifier to facilitate the user to pump in or pump out the lubricating oil. By periodically adding new lubricating grease and removing the old lubricating grease, the lubrication system can be updated, making lubrication maintenance more convenient and practical.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A double-seal structure for a classifier bearing chamber, comprising a bearing chamber body (1), a mounting bracket (7), a first skeleton oil seal (2), a second skeleton oil seal (3), and a dustproof bushing (11), characterized in that, The bearing housing (1) is fixedly installed with a mounting bracket (7), and the mounting bracket (7) is fixedly installed with a mounting bearing (6). A rotating shaft (12) is installed inside the mounting bearing (6). The rotating shaft (12) is located in the part of the bearing housing (1) with a first skeleton oil seal (2) and a second skeleton oil seal (3) installed through it. The outer wall of the rotating shaft (12) is in contact with the inner wall of the first skeleton oil seal (2) and the second skeleton oil seal (3). A dustproof bushing (11) is installed on the rotating shaft (12) with an interference fit. The side wall of the dustproof bushing (11) is respectively provided with a first sealing groove (13) and a second sealing groove (14). A PTFE gasket (10) is fitted on the dustproof bushing (11).

2. The double-seal structure for the bearing chamber of a classifier according to claim 1, characterized in that, The inner cavity of the mounting bracket (7) is connected to an oil change inlet pipe (4) on one side and an oil change outlet pipe (9) on the other side.

3. The double-seal structure for the bearing chamber of a classifier according to claim 2, characterized in that, One port of the oil inlet pipe (4) and the oil outlet pipe (9) are located between the mounting bearing (6) and the first skeleton oil seal (2), and the other port of the oil inlet pipe (4) and the oil outlet pipe (9) are located between the first skeleton oil seal (2) and the second skeleton oil seal (3).

4. The double-seal structure for the bearing chamber of a classifier according to claim 1, characterized in that, The central axes of the bearing housing (1), mounting bracket (7), mounting bearing (6), first skeleton oil seal (2), second skeleton oil seal (3) and dustproof bushing (11) are on the same straight line.

5. The double-seal structure for the bearing chamber of a classifier according to claim 2, characterized in that, The cross-sectional shape of the oil change inlet pipe (4) and the oil change outlet pipe (9) is an inverted F shape.

6. The double-seal structure for the bearing chamber of a classifier according to claim 1, characterized in that, The bearing housing (1) has several fixed mounting blocks (5) evenly welded to the four corners of the top, and mounting bolts (8) are installed on the fixed mounting blocks (5).

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