Adjustable sealing structure of oil-free screw machine

Abstract

The utility model provides an adjustable sealing structure of an oil-free screw machine, which comprises a floating type oil seal structure (1) and a floating type air seal structure (2), the floating type oil seal structure (1) and the floating type air seal structure (2) are both axially sleeved in a rotating shaft (3) and a shaft hole of the oil-free screw machine, and an adjusting sleeve (4) is arranged between the floating type oil seal structure (1) and the floating type air seal structure (2). The adjusting sleeves (4) are arranged in the shaft holes in a sleeved mode, the outer side ends of the adjusting sleeves (4) abut against the rear end of an oil seal seat (5) of the floating type oil seal structure (1), the inner side ends of the adjusting sleeves (4) abut against the front end of an air seal seat (6) of the floating type air seal structure (2), and the distance between the floating type oil seal structure (1) and the floating type air seal structure (2) is adjusted by replacing the adjusting sleeves (4) with different axial lengths. The size of the adjustable sealing structure is adjustable in the axial direction, and therefore compatibility is improved.

Description

Technical Field

[0001] This utility model relates to the field of oil-free screw compressor technology, specifically an adjustable sealing structure for an oil-free screw compressor. Background Technology

[0002] Oil-free screw compressors, such as screw blowers, are important industrial equipment widely used in wastewater treatment, cement production, chemical industry, textiles, and other fields. The sealing structure of a screw blower is particularly important. Generally, oil-free screw compressors use either gas seals or oil seals. An effective and reliable gas seal and oil seal structure can prevent lubricating oil from leaking into the working chamber of the screw blower. At the same time, a highly efficient gas seal structure can also reduce the leakage of compressed gas from the working chamber.

[0003] In the prior art, in order to ensure gas sealing and oil sealing while adapting to use in rotating working environments, a floating combined sealing structure has been designed. The inner part of the floating combined sealing structure is used to block gas, and the outer part of the floating combined sealing structure is used to block oil, thereby achieving oil-gas isolation as much as possible. However, the prior art cannot be adjusted, and therefore cannot be compatible with different sizes of machines.

[0004] The applicant will propose an adjustable sealing structure for an oil-free screw compressor, with an adjustable axial dimension design to improve compatibility. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defects of the prior art and propose an adjustable sealing structure for an oil-free screw compressor with an adjustable axial dimension, thereby improving compatibility.

[0006] Compared with the prior art, this utility model proposes an adjustable sealing structure for an oil-free screw compressor, including a floating oil seal structure and a floating air seal structure. Both the floating oil seal structure and the floating air seal structure are axially fitted into the rotating shaft and shaft hole of the oil-free screw compressor. An adjusting sleeve is provided between the floating oil seal structure and the floating air seal structure. The adjusting sleeve is fitted into the shaft hole. The outer end of the adjusting sleeve abuts against the rear end of the oil seal seat of the floating oil seal structure, and the inner end of the adjusting sleeve abuts against the front end of the air seal seat of the floating air seal structure. The distance between the floating oil seal structure and the floating air seal structure can be adjusted by replacing adjusting sleeves of different axial lengths.

[0007] Compared with the prior art, the present invention has the following advantages after adopting the above structure:

[0008] This disclosure achieves an adjustable axial dimension design by adding an adjusting sleeve and replacing the adjusting sleeve with one of different axial lengths, thereby improving compatibility. The floating oil seal structure and the floating air seal structure can then be used interchangeably.

[0009] As an improvement, the floating oil seal structure includes a spring limiting sleeve, a first spring, an oil sealing ring, and an oil sealing seat. The oil sealing ring has a first circumferential protrusion. The first spring is fitted onto the oil sealing ring from one end outside and abuts against the outer end of the first circumferential protrusion. The oil sealing ring is inserted into the oil sealing seat from the outside and is movably fitted into the oil sealing seat. The oil sealing seat has a first inner circumferential portion. The spring limiting sleeve axially limits the first spring, and the first spring presses the oil sealing ring against the oil sealing seat through the cooperation of the first circumferential protrusion and the first inner circumferential portion, so that the rear end of the oil sealing seat abuts against the outer end of the adjusting sleeve.

[0010] As an improvement, the cylindrical portion of the oil sealing ring is extended outward, and the spring limiting sleeve is fitted around the outer periphery of the cylindrical portion while also pressing the first spring axially.

[0011] As an improvement, a spiral groove is provided on the inner circumference of the oil sealing ring.

[0012] As an improvement, a sealing ring is provided between the first circumferential convex portion and the first inner circumferential portion.

[0013] As an improvement, the floating air seal structure includes an air seal ring, a second spring, and an air seal seat. The air seal ring has a second circumferential protrusion. The second spring is fitted onto the air seal ring from one end inside and abuts against the inner end of the second circumferential protrusion. The air seal ring is inserted into the air seal seat from one end outside and is movably fitted into the air seal seat. The air seal seat has a second inner circumferential portion. The second spring is axially restricted between the second circumferential protrusion and the second inner circumferential portion. The inner end of the adjusting sleeve extends radially and blocks the outer side of the air seal ring. The axial distance between the inner end of the adjusting sleeve and the second inner circumferential portion is greater than the axial length of the air seal ring, thereby axially limiting the axially movable air seal ring between the inner end of the adjusting sleeve and the second inner circumferential portion. Attached Figure Description

[0014] Figure 1 This is a three-dimensional schematic diagram of an adjustable sealing structure for an oil-free screw compressor.

[0015] Figure 2 This is an exploded view of an adjustable sealing structure for an oil-free screw compressor.

[0016] Figure 3 This is a three-dimensional schematic diagram of an adjustable sealing structure for an oil-free screw compressor after the oil baffle ring is installed.

[0017] Figure 4 for Figure 3 A three-dimensional schematic diagram after further fitting the bearing.

[0018] Figure 5 This is a cross-sectional view of an oil-free screw compressor.

[0019] Figure 6 This is an enlarged view of A.

[0020] Explanation of reference numerals in the attached drawings: 1. Floating oil seal structure; 2. Floating gas seal structure; 3. Rotating shaft; 4. Adjusting sleeve; 5. Oil seal seat; 6. Gas seal seat; 7. Spring limiting sleeve; 8. First spring; 9. Oil seal ring; 10. First circumferential protrusion; 11. First inner circumferential portion; 12. Spiral groove; 13. Sealing ring; 14. Gas seal ring; 15. Second spring; 16. Second circumferential protrusion; 17. Second inner circumferential portion; 18. First rotor; 19. Second rotor; 20. Oil baffle ring; 21. Bearing. Detailed Implementation

[0021] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The embodiments described below are merely examples, and other obvious variations will arise for those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0022] The present invention will now be described in further detail:

[0023] For ease of description and understanding, directional descriptions are used for illustrative purposes only and do not constitute a limitation on the scope of rights protection.

[0024] like Figures 1 to 6 As shown, this disclosure proposes an adjustable sealing structure for an oilless screw compressor, including a floating oil seal structure 1 and a floating air seal structure 2. Both the floating oil seal structure 1 and the floating air seal structure 2 are axially fitted into the rotating shaft 3 and shaft hole of the oilless screw compressor. It can be understood that the through hole that rotates and engages with the rotating shaft 3 is the shaft hole. An adjusting sleeve 4 is provided between the floating oil seal structure 1 and the floating air seal structure 2. The adjusting sleeve 4 is fitted into the shaft hole. The outer end of the adjusting sleeve 4 abuts against the rear end of the oil seal seat 5 of the floating oil seal structure 1, and the inner end of the adjusting sleeve 4 abuts against the front end of the air seal seat 6 of the floating air seal structure 2. The distance between the floating oil seal structure 1 and the floating air seal structure 2 can be adjusted by replacing the adjusting sleeve 4 with different axial lengths.

[0025] Among them, such as Figure 6As shown, the floating oil seal structure 1 has the following structure: The floating oil seal structure 1 includes a spring limiting sleeve 7, a first spring 8, an oil sealing ring 9, and an oil sealing seat 5. The oil sealing ring 9 is provided with a first circumferential protrusion 10. The first circumferential protrusion 10 is formed by radially protruding outward on the outer circumferential wall of the oil sealing ring 9, and can be continuous or discontinuous. The first spring 8 is fitted onto the oil sealing ring 9 from one end outside and abuts against the outer end of the first circumferential protrusion 10. The oil sealing ring 9 is inserted into the oil sealing seat 5 from the outside and is movably fitted into the oil sealing seat 5. The oil sealing seat 5 is provided with a first inner circumferential portion 11, which provides an inner circumferential annular end face. The spring limiting sleeve 7 axially limits the first spring 8. The first spring 8 presses the oil sealing ring 9 against the oil sealing seat 5 through the cooperation of the first circumferential protrusion 10 and the inner circumferential annular end face of the first inner circumferential portion 11, and makes the rear end of the oil sealing seat 5 abut against the outer end of the adjusting sleeve 4.

[0026] In some embodiments, such as Figure 6 As shown, the cylindrical portion of the first spring 8, which is fitted onto the oil sealing ring 9, extends outward. The spring limiting sleeve 7 is fitted around the outer circumference of the cylindrical portion and simultaneously presses the first spring 8 axially. In this way, the cylindrical portion is longer, which helps to form a larger sealing surface with the outer circumference of the rotating shaft 3. On the other hand, it facilitates the fitting of the spring limiting sleeve 7 and the first spring 8 onto the oil sealing ring 9.

[0027] Furthermore, such as Figure 6 As shown, the inner circumference of the oil sealing ring 9 is provided with a spiral groove 12. For example, a continuous spiral groove 12 is provided on the inner circumferential surface of the columnar part to form a better seal.

[0028] In some embodiments, such as Figure 6 As shown, a sealing ring 13 is provided between the first circumferential protrusion 10 and the first inner circumferential portion 11. This enables a better seal.

[0029] Among them, such as Figure 6As shown, the floating air seal structure 2 has the following structure: The floating air seal structure 2 includes an air seal ring 14, a second spring 15, and an air seal seat 6. The air seal ring 14 is provided with a second circumferential protrusion 16, which is formed, for example, radially and outwardly protruding on the outer circumferential wall of the air seal ring 14. This protrusion can be continuous or discontinuous. The second spring 15 is fitted onto the air seal ring 14 from one end inside and abuts against the inner end of the second circumferential protrusion 16. The air seal ring 14 is inserted into the air seal seat 6 from one end outside and is movably fitted with the air seal seat 6. The sealing seat 6 is provided with a second inner peripheral portion 17, which has an inner circumferential end face. The second spring 15 is axially restricted between the inner end of the second circumferential protrusion 16 and the inner circumferential end face of the second inner peripheral portion 17. The inner end of the adjusting sleeve 4 extends radially and blocks the outer side of the gas sealing ring 14. The axial distance between the inner end of the adjusting sleeve 4 and the inner circumferential end face of the second inner peripheral portion 17 is greater than the axial length of the gas sealing ring 14. This allows the inner end of the adjusting sleeve 4 to axially limit the axially movable gas sealing ring 14 between the inner end of the adjusting sleeve 4 and the second inner peripheral portion 17.

[0030] In this example, as Figure 5 The oil-free screw compressor shown includes a first rotor 21 and a second rotor 22. Each end of the first rotor 21 and the second rotor 22 is equipped with an adjustable sealing structure of the oil-free screw compressor, so a total of four adjustable sealing structures of the oil-free screw compressor are installed.

[0031] Furthermore, such as Figure 3 , 4 As shown in Figure 6, the outer ring of the bearing 21 limits the spring limiting sleeve 7. In order to achieve better sealing, an oil baffle ring 20 is provided between the bearing 21 and the spring limiting sleeve 7. The oil baffle ring 20 is fitted on the rotating shaft 3 and rotates with the rotating shaft 3, thereby reducing the channel for oil or oil mist to reach the oil sealing ring 9, making it difficult for oil or oil mist to reach the oil sealing ring 9 quickly.

[0032] When understanding this utility model, the above structure may be referred to other embodiments / appendices if necessary. Figure 1 And that is understood, so I will not elaborate further here.

[0033] The above description is merely an illustrative embodiment of this utility model. Therefore, all equivalent changes or modifications made to the structure, features, and principles described in the scope of protection of this utility model are included within the scope of protection of this utility model.

Claims

1. An adjustable sealing structure for an oil-free screw compressor, comprising a floating oil seal structure (1) and a floating air seal structure (2), wherein both the floating oil seal structure (1) and the floating air seal structure (2) are axially fitted into the rotating shaft (3) and shaft hole of the oil-free screw compressor, characterized in that, An adjusting sleeve (4) is provided between the floating oil seal structure (1) and the floating air seal structure (2). The adjusting sleeve (4) is fitted in the shaft hole. The outer end of the adjusting sleeve (4) abuts against the rear end of the oil seal seat (5) of the floating oil seal structure (1), and the inner end of the adjusting sleeve (4) abuts against the front end of the air seal seat (6) of the floating air seal structure (2). The distance between the floating oil seal structure (1) and the floating air seal structure (2) can be adjusted by replacing the adjusting sleeve (4) with different axial lengths.

2. The adjustable sealing structure of an oil-free screw compressor according to claim 1, characterized in that, The floating oil seal structure (1) includes a spring limiting sleeve (7), a first spring (8), an oil sealing ring (9), and an oil sealing seat (5). The oil sealing ring (9) is provided with a first circumferential protrusion (10). The first spring (8) is fitted onto the oil sealing ring (9) from one end outside the oil sealing ring (9) and abuts against the outer end of the first circumferential protrusion (10). The oil sealing ring (9) is inserted into the oil sealing seat (5) from the outside and is movably fitted into the oil sealing seat (5). The oil sealing seat (5) is provided with a first inner circumferential portion (11). The spring limiting sleeve (7) limits the first spring (8) axially. The first spring (8) presses the oil sealing ring (9) against the oil sealing seat (5) through the cooperation of the first circumferential protrusion (10) and the first inner circumferential portion (11), and makes the rear end of the oil sealing seat (5) abut against the outer end of the adjusting sleeve (4).

3. The adjustable sealing structure of an oil-free screw compressor according to claim 2, characterized in that, The oil sealing ring (9) is mounted on the columnar part of the first spring (8) and extends outward. The spring limiting sleeve (7) is fitted around the outer periphery of the columnar part and presses the first spring (8) in the axial direction.

4. The adjustable sealing structure of an oil-free screw compressor according to claim 2 or 3, characterized in that, The inner circumference of the oil sealing ring (9) is provided with a spiral groove (12).

5. The adjustable sealing structure of an oil-free screw compressor according to claim 2, characterized in that, A sealing ring (13) is provided between the first circumferential protrusion (10) and the first inner circumferential portion (11).

6. The adjustable sealing structure of an oil-free screw compressor according to claim 1, characterized in that, The floating gas seal structure (2) includes a gas seal ring (14), a second spring (15), and a gas seal seat (6). The gas seal ring (14) is provided with a second circumferential protrusion (16). The second spring (15) is fitted onto the gas seal ring (14) from one end inside the gas seal ring (14) and abuts against the inner end of the second circumferential protrusion (16). The gas seal ring (14) is inserted into the gas seal seat (6) from one end outside the gas seal seat (6) and is movably fitted into the gas seal seat (6). The gas seal seat (6) is provided with a second inner circumferential portion (17). The second spring (15) is axially restricted between the second circumferential protrusion (16) and the second inner circumferential portion (17), while the inner end of the adjusting sleeve (4) extends radially and blocks the outer side of the gas sealing ring (14). The axial distance between the inner end of the adjusting sleeve (4) and the second inner circumferential portion (17) is greater than the axial length of the gas sealing ring (14), thereby axially limiting the axially movable gas sealing ring (14) between the inner end of the adjusting sleeve (4) and the second inner circumferential portion (17).

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