Sealing structure of oil-free screw machine
By incorporating a spring-supported floating sealing structure in an oil-free screw press, the assembly difficulties in existing technologies are resolved. This enables automatic adjustment of the sealing structure during rotation and reduces uneven wear, thereby improving assembly convenience and sealing performance.
Patent Information
- Application Number
- CN202520034912.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-07
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2035-01-07
AI Technical Summary
The existing floating combined sealing structure of oil-free screw compressors is difficult to assemble and cannot effectively isolate oil and gas in a rotating environment.
The system employs a combined structure consisting of a first spring pressure block, a first spring, an oil sealing ring, an oil sealing seat, a first air sealing ring, a second spring, and a first air sealing seat arranged sequentially from the outside to the inside along the axial direction. The springs support the oil sealing ring and the air sealing ring to achieve a floating seal, reducing uneven wear and improving assembly convenience.
The sealing structure of the oil-free screw compressor automatically adjusts its position during rotation, reducing uneven wear and improving assembly efficiency and sealing effect.
Smart Images
Figure CN223621791U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of oil-free screw compressor technology, specifically a 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, and at the same time adapt to the 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, so as to achieve oil-gas isolation as much as possible. However, this design makes assembly difficult.
[0004] The applicant will propose a sealing structure for an oil-free screw compressor, which facilitates assembly. 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 a sealing structure for an oil-free screw compressor, which is conducive to convenient assembly.
[0006] Compared with the prior art, this utility model proposes a sealing structure for an oilless screw compressor, which includes a first spring block, a first spring, an oil sealing ring, an oil sealing seat, a first air sealing ring, a second spring, and a first air sealing seat arranged sequentially from the outside to the inside along the axial direction.
[0007] The oil sealing ring is provided with a first mounting annular protrusion. A first spring is fitted onto the oil sealing ring from one outer end and abuts against the outer end of the first mounting annular protrusion. The oil sealing ring is fitted into the oil sealing seat from one outer end with a gap. The oil sealing seat is provided with a first annular stop on its inner side. The first spring pressure block presses the first spring in the axial direction. The first spring then presses the oil sealing ring against the oil sealing seat through the cooperation of the first mounting annular protrusion and the first annular stop, and applies axial pressure to the oil sealing seat inward.
[0008] The first air-sealing ring is provided with a second mounting annular protrusion. The second spring is fitted onto the first air-sealing ring from one end inside and abuts against the inner end of the second mounting annular protrusion. The first air-sealing ring is fitted into the first air-sealing seat from one end outside with a gap. The first air-sealing seat is provided with a second annular stop on its inner side. The second spring is axially restricted between the second mounting annular protrusion and the second annular stop.
[0009] The inner end of the oil seal seat is axially press-fitted with the outer end of the first gas seal ring. This press-fitting engagement causes the second mounting annular protrusion to pre-press the second spring between the second mounting annular protrusion and the second annular stop.
[0010] Compared with the prior art, the present invention has the following advantages after adopting the above structure:
[0011] The disclosed sealing structure is a floating combined sealing structure. A first spring elastically supports the oil sealing ring, and a second spring elastically supports the first gas sealing ring. The oil sealing ring is fitted into the outer end of the oil sealing seat with a gap. Therefore, the oil sealing ring can float in both axial and radial directions, automatically adjusting its position relative to the rotating shaft of the oil-free screw compressor, thus preventing uneven wear. Similarly, the first gas sealing ring is fitted into the outer end of the first gas sealing seat with a gap, allowing it to float in both axial and radial directions as well. This also automatically adjusts the position of the oil sealing ring relative to the rotating shaft of the oil-free screw compressor, preventing uneven wear.
[0012] For ease of assembly, this disclosure discloses a first spring block, a first spring, an oil sealing ring, an oil sealing seat, a first gas sealing ring, a second spring, and a first gas sealing seat arranged sequentially from the outside to the inside along the axial direction. The oil sealing ring has a first mounting annular protrusion. The first spring is fitted onto the oil sealing ring from one outer end and abuts against the outer end of the first mounting annular protrusion. The oil sealing ring is loosely fitted into the oil sealing seat from one outer end. The oil sealing seat has a first annular stop on its inner side. The first spring block presses the first spring axially, and the first spring presses the oil sealing ring against the oil sealing seat through the engagement of the first mounting annular protrusion and the first annular stop, thus ensuring the oil seal is properly sealed. The sealing seat applies axial pressure inwards. The first gas-sealing ring has a second mounting annular protrusion. The second spring is fitted onto the first gas-sealing ring from one end inside and abuts against the inner end of the second mounting annular protrusion. The first gas-sealing ring is loosely fitted onto the first gas-sealing seat from one end outside. The first gas-sealing seat has a second annular stop on its inner side. The second spring is axially constrained between the second mounting annular protrusion and the second annular stop. The inner end of the oil seal seat is axially press-fitted against the outer end of the first gas-sealing ring. This press-fit causes the second mounting annular protrusion to pre-press the second spring between the second mounting annular protrusion and the second annular stop. Therefore, it can be easily assembled axially.
[0013] As an improvement, a sealing ring is also provided between the first mounting annular protrusion and the first annular stop.
[0014] As an improvement, the outer end of the first spring block is axially pressed and limited by the outer ring of the bearing or by the retaining ring.
[0015] As an improvement, an oil baffle ring is also included, which is inserted and installed from the outer end of the first spring block and mounted on the shaft of the oilless screw compressor, and the oil baffle ring rotates together with the shaft.
[0016] As an improvement, in the case of bearings, the oil retainer ring is axially pressed and limited by the inner ring of the bearing.
[0017] As an improvement, a spiral groove is provided on the inner circumference of the oil sealing ring.
[0018] As an improvement, the outer end of the first spring block is provided with multiple axial protrusions, and the axial protrusions are distributed sequentially in the circumferential direction of the outer end of the first spring block.
[0019] As an improvement, both the first and second springs are made of wave springs.
[0020] As an improvement, it also includes a second air-sealing ring, a third spring, and a second air-sealing seat. The second air-sealing ring is provided with a third mounting annular protrusion. The third spring is fitted onto the second air-sealing ring from one end inside and abuts against the inner end of the third mounting annular protrusion. The second air-sealing seat is provided as a washer. The third spring is axially restricted between the third mounting annular protrusion and the washer.
[0021] The inner end of the first airtight seat is axially pressed against the outer end of the second airtight ring. This pressing fit causes the second mounting annular protrusion of the second airtight ring to pre-press the third spring between the third mounting annular protrusion and the washer.
[0022] As an improvement, the outer ring of the oil sealing ring is extended outward, and the first spring pressure block is fitted around the outer circumference of the outer ring while also pressing the first spring axially. Attached Figure Description
[0023] Figure 1 This is a three-dimensional schematic diagram of an oil-free screw compressor.
[0024] Figure 2 This is a three-dimensional schematic diagram of an oil-free screw compressor, where both ends of the two rotating shafts are equipped with sealing structures.
[0025] Figure 3 This is an exploded three-dimensional schematic diagram of the sealing structure of an oil-free screw compressor.
[0026] Figure 4This is a schematic axial cross-sectional view of the sealing structure of an oil-free screw compressor.
[0027] Figure 5 This is an enlarged schematic diagram of A.
[0028] Explanation of reference numerals in the attached drawings: 1. First spring pressure block; 2. First spring; 3. Oil sealing ring; 4. Oil sealing seat; 5. First gas sealing ring; 6. Second spring; 7. First gas sealing seat; 8. First mounting annular protrusion; 9. First annular stop; 10. Second mounting annular protrusion; 11. Second annular stop; 12. Sealing ring; 13. Bearing; 14. Oil retaining ring; 15. Spiral groove; 16. Axial protrusion; 17. Second gas sealing ring; 18. Third spring; 19. Second gas sealing seat; 20. Third mounting annular protrusion; 21. First rotor; 22. Second rotor; 23. Shaft. Detailed Implementation
[0029] 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.
[0030] The present invention will now be described in further detail:
[0031] 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.
[0032] like Figures 1 to 5 As shown, this disclosure proposes a sealing structure for an oilless screw compressor, comprising a first spring block 1, a first spring 2, an oil sealing ring 3, an oil sealing seat 4, a first air sealing ring 5, a second spring 6, and a first air sealing seat 7 arranged sequentially from the outside to the inside along the axial direction.
[0033] The oil sealing ring 3 is provided with a first mounting annular protrusion 8. The first spring 2 is fitted onto the oil sealing ring 3 from one outer end and abuts against the outer end of the first mounting annular protrusion 8. The oil sealing ring 3 is fitted into the oil sealing seat 4 from one outer end with a gap. The oil sealing seat 4 is provided with a first annular stop 9 on its inner side. The first spring pressure block 1 presses the first spring 2 in the axial direction. The first spring 2 presses the oil sealing ring 3 against the oil sealing seat 4 through the cooperation of the first mounting annular protrusion 8 and the first annular stop 9, and applies axial pressure to the oil sealing seat 4 inward.
[0034] The first airtight ring 5 is provided with a second mounting annular protrusion 10. The second spring 6 is fitted onto the first airtight ring 5 from one end inside the first airtight ring 5 and abuts against the inner end of the second mounting annular protrusion 10. The first airtight ring 5 is fitted into the first airtight seat 7 from one end outside the first airtight seat 7 with a gap. The first airtight seat 7 is provided with a second annular stop 11 on its inner side. The second spring 6 is axially restricted between the second mounting annular protrusion 10 and the second annular stop 11.
[0035] The inner end of the oil seal seat 4 is axially pressed against the outer end of the first gas seal ring 5. This pressing fit causes the second mounting annular protrusion 10 to pre-press the second spring 6 between the second mounting annular protrusion 10 and the second annular stop 11.
[0036] like Figure 5 As shown, when this invention is installed on the rotating shaft 23 of an oilless screw compressor and in the shaft hole that rotatably engages with the rotating shaft 23, during operation, the rotating shaft 23 rotates relative to the shaft hole. A first sealing surface is formed between the oil sealing ring 3 and the outer circumferential surface of the rotating shaft 23. Supported by the first spring 2, the oil sealing ring 3 can self-align, thus avoiding interference and wear with the outer circumferential surface of the rotating shaft 23. Therefore, a floating sealing structure on the oil-blocking side is formed. A second sealing surface is formed between the first gas sealing ring 5 and the outer circumferential surface of the rotating shaft 23. Supported by the second spring 6, the oil sealing ring 3 can self-align, thus avoiding interference and wear with the outer circumferential surface of the rotating shaft 23. Therefore, a floating sealing structure on the gas side is formed. It is evident that the floating sealing structure is relatively complex, while this invention achieves convenient assembly through improvements.
[0037] There are two ways to limit the outer end of the first spring block 1. The first way is to use the outer ring of the bearing 13 for axial compression and limiting. The second way is to use the retaining ring for axial compression and limiting, such as a snap ring.
[0038] This example mainly illustrates the first solution, which has fewer parts and is easier to assemble.
[0039] In some embodiments, such as Figure 3 , 5 As shown, a sealing ring 12 is also provided between the first mounting annular protrusion 8 and the first annular stop 9. This prevents oil-side substances from entering the gas side from between the first mounting annular protrusion 8 and the first annular stop 9, thereby forming a better seal.
[0040] In some embodiments, such as Figure 3 , 5 As shown, it also includes an oil baffle ring 14, which is inserted and installed from the outer end of the first spring pressure block 1 and mounted on the rotating shaft 23 of the oilless screw compressor. The oil baffle ring 14 rotates together with the rotating shaft 23. This serves to prevent oil from flowing, or as a primary oil baffle.
[0041] Furthermore, in the case where bearing 13 is used, the oil retainer ring 14 is axially pressed and limited by the inner ring of bearing 13. This facilitates assembly.
[0042] In some embodiments, such as Figure 3 , 5 As shown, the inner circumference of the oil sealing ring 3 is provided with a spiral groove 15. In this way, the spiral groove 15 further provides sealing performance.
[0043] In some embodiments, such as Figure 3 , 5 As shown, the outer end of the first spring block 1 is provided with multiple axial protrusions 16. These axial protrusions 16 are sequentially distributed circumferentially on the outer end of the first spring block 1. Each axial protrusion 16 is used for limiting the outer end of the first spring block 1. For example, in the case of using a bearing 13, each axial protrusion 16 abuts against the outer ring of the bearing 13. Using multiple axial protrusions 16 can reduce the machining amount of the precision end face, thereby ensuring axial fit accuracy while reducing costs.
[0044] In some embodiments, such as Figure 5 As shown, the outer ring portion of the oil sealing ring 3 extends outward from the outer ring portion of the first spring 2. The first spring pressure block 1 is fitted around the outer circumference of the outer ring portion and simultaneously presses the first spring 2 axially. In other words, the outer ring portion of the oil sealing ring 3 simultaneously mates with both the first spring 2 and the first spring pressure block 1, thus facilitating assembly.
[0045] The air seal structure can be further improved to provide a better air seal, for example, Figure 5 As shown, it also includes a second airtight ring 17, a third spring 18, and a second airtight seat 19. The second airtight ring 17 is provided with a third mounting annular protrusion 20. The third spring 18 is fitted onto the second airtight ring 17 from one end inside the second airtight ring 17 and abuts against the inner end of the third mounting annular protrusion 20. The second airtight seat 19 is set as a washer. The third spring 18 is axially restricted between the third mounting annular protrusion 20 and the washer.
[0046] The inner end of the first airtight seat 7 is axially pressed against the outer end of the second airtight ring 17. This pressing fit causes the second mounting annular protrusion 10 of the second airtight ring 17 to pre-press the third spring 18 between the third mounting annular protrusion 20 and the washer.
[0047] This not only makes assembly easier, but also adds a set of air seal structures. In addition, the second air seal seat 19 is set as a gasket, which helps to reduce the diameter of the shaft hole and to machine the annular stepped surface of the first air seal seat 7 for axial limiting in the shaft hole.
[0048] In this example, both the first spring 2 and the second spring 6 are wave springs.
[0049] In this example, as Figure 1 , 2 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 a sealing structure of the oil-free screw compressor, so a total of four sealing structures of the oil-free screw compressor are installed.
[0050] 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.
[0051] 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. A sealing structure for an oil-free screw compressor, characterized in that, It includes a first spring block (1), a first spring (2), an oil sealing ring (3), an oil sealing seat (4), a first air sealing ring (5), a second spring (6), and a first air sealing seat (7) arranged sequentially from the outside to the inside along the axial direction; The oil sealing ring (3) is provided with a first mounting annular protrusion (8). The first spring (2) is fitted onto the oil sealing ring (3) from one side of the oil sealing ring (3) and abuts against the outer end of the first mounting annular protrusion (8). The oil sealing ring (3) is fitted into the oil sealing seat (4) from one side of the oil sealing ring (4) with a gap. The oil sealing seat (4) is provided with a first annular stop (9) on the inner side. The first spring pressure block (1) presses the first spring (2) in the axial direction. The first spring (2) presses the oil sealing ring (3) against the oil sealing seat (4) through the cooperation of the first mounting annular protrusion (8) and the first annular stop (9), and applies pressure to the oil sealing seat (4) in the axial direction. The first air-sealing ring (5) is provided with a second mounting annular protrusion (10). The second spring (6) is fitted onto the first air-sealing ring (5) from one end inside and abuts against the inner end of the second mounting annular protrusion (10). The first air-sealing ring (5) is fitted into the first air-sealing seat (7) from one end outside. The first air-sealing seat (7) is provided with a second annular stop (11) on its inner side. The second spring (6) is axially restricted between the second mounting annular protrusion (10) and the second annular stop (11). The inner end of the oil seal seat (4) is axially press-fitted with the outer end of the first gas seal ring (5). This press-fitting causes the second mounting annular protrusion (10) to pre-press the second spring (6) between the second mounting annular protrusion (10) and the second annular stop (11).
2. The sealing structure of an oil-free screw compressor according to claim 1, characterized in that, A sealing ring (12) is also provided between the first mounting annular protrusion (8) and the first annular stop (9).
3. The sealing structure of an oil-free screw compressor according to claim 1, characterized in that, The outer end of the first spring block (1) is axially pressed and limited by the outer ring of the bearing (13) or by the retaining ring.
4. The sealing structure of an oil-free screw compressor according to claim 3, characterized in that, It also includes an oil baffle ring (14), which is installed from the outer end of the first spring block (1) and mounted on the rotating shaft (23) of the oilless screw compressor. The oil baffle ring (14) rotates together with the rotating shaft (23).
5. The sealing structure of an oil-free screw compressor according to claim 4, characterized in that, In the case where a bearing (13) is used, the oil retainer ring (14) is axially pressed and limited by the inner ring of the bearing (13).
6. The sealing structure of an oil-free screw compressor according to claim 1, characterized in that, The inner circumference of the oil sealing ring (3) is provided with a spiral groove (15).
7. The sealing structure of an oil-free screw compressor according to claim 1, 3, or 4, characterized in that, The outer end of the first spring block (1) is provided with multiple axial protrusions (16), and the axial protrusions (16) are distributed in sequence around the outer end of the first spring block (1).
8. The sealing structure of an oil-free screw compressor according to claim 1, characterized in that, Both the first spring (2) and the second spring (6) are wave springs.
9. The sealing structure of an oil-free screw compressor according to claim 1, characterized in that, It also includes a second air-sealing ring (17), a third spring (18), and a second air-sealing seat (19). The second air-sealing ring (17) is provided with a third mounting annular protrusion (20). The third spring (18) is fitted onto the second air-sealing ring (17) from one end inside and abuts against the inner end of the third mounting annular protrusion (20). The second air-sealing seat (19) is set as a washer. The third spring (18) is axially restricted between the third mounting annular protrusion (20) and the washer. The inner end of the first air-tight seat (7) is axially press-fitted with the outer end of the second air-tight ring (17). This press-fitting makes the second mounting annular protrusion (10) of the second air-tight ring (17) pre-press the third spring (18) between the third mounting annular protrusion (20) and the washer.
10. The sealing structure of an oil-free screw compressor according to claim 1, characterized in that, The oil sealing ring (3) is set on the outer ring of the first spring (2) and extends outward. The first spring pressure block (1) is fitted on the outer circumference of the outer ring and presses the first spring (2) in the axial direction.