A dry gas sealing structure device for a horizontal sand mill
By using a dry gas sealing structure device, an inert gas is used to form a gas film seal, which solves the problem of mechanical seal leakage in sand mills, achieves a good sealing effect without liquid lubrication, and ensures product quality control.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI KELAN SEAL COMPONENT CO LTD
- Filing Date
- 2025-08-29
- Publication Date
- 2026-06-30
AI Technical Summary
The mechanical seal of the existing sand mill leaks during the dry powder processing, causing powder particles to come into contact with liquid and affecting product quality control.
The device employs a dry gas sealing structure, including a first stationary ring seat, a bushing, a gland assembly, and a second stationary ring seat. It utilizes inert gas to form a gas film seal, achieving sealing through the vortex-shaped dynamic pressure spiral grooves of the atmospheric side stationary ring and the medium side stationary ring. Combined with elastic and blocking structures, it prevents powder particles from entering the sealing area.
It achieves excellent sealing performance without liquid lubrication, prevents powder particles from entering the sealing area, ensures product quality control, and provides a sealing guarantee without liquid lubrication.
Smart Images
Figure CN224433415U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of mechanical manufacturing technology, and in particular to a dry gas sealing structure device for a horizontal sand mill. Background Technology
[0002] In the process of dry powder processing, sand mills are often used to process the dry powder particles. Sand mills achieve fine grinding and dispersion of powder particles through the high-speed rotation and collision of grinding media, and are widely used in chemical, pharmaceutical and other fields.
[0003] In the dry powder grinding process, the mechanical seals commonly used in sand mills require liquid lubrication. Mechanical seals have a certain leakage rate, and powder particles cannot come into contact with liquid. If powder particles come into contact with liquid, the finished product will be scrapped, affecting product quality control, and there is room for improvement. Utility Model Content
[0004] In order to achieve a seal for the sand mill while preventing powder particles inside the mill from coming into contact with liquid, this application provides a dry gas sealing structure device for a horizontal sand mill.
[0005] The dry gas sealing structure device for a horizontal sand mill provided in this application adopts the following technical solution:
[0006] A dry gas sealing structure device for a horizontal sand mill includes a first stationary ring seat, a bushing, a pressure cap assembly, and a second stationary ring seat. The pressure cap assembly is coaxially sleeved on the outer side wall of the bushing. A cavity for inert gas to flow is formed between the pressure cap assembly and the bushing, and an air inlet communicating with the cavity is opened on the outer side wall of the pressure cap assembly.
[0007] The first stationary ring seat and the second stationary ring seat are sealed and installed at both ends of the gland assembly. An atmospheric stationary ring and an atmospheric moving ring are sealed and installed between the first stationary ring seat and the bushing. A medium moving ring and a medium stationary ring are sealed and connected between the second stationary ring seat and the bushing. An elastic structure is provided between the medium moving ring and the medium moving ring. An air film is formed between the sealing surfaces of the atmospheric stationary ring and the atmospheric moving ring, and between the sealing surfaces of the medium stationary ring and the medium moving ring.
[0008] Both the atmospheric-side stationary ring and the medium-side stationary ring have dynamic pressure spiral grooves on their sealing surfaces. The dynamic pressure spiral grooves are arranged in a vortex shape, and the spiral directions of the dynamic pressure spiral grooves on the end face of the atmospheric-side stationary ring and the sealing surface of the medium-side stationary ring are opposite.
[0009] A blocking structure for blocking the medium is installed between the medium-side stationary ring seat and the bushing.
[0010] By adopting the above technical solution, during equipment operation, the atmospheric-side moving ring and the media-side moving ring rotate together with the bushing. Since the end faces of both the atmospheric-side stationary ring and the media-side stationary ring are provided with centripetally arranged vortex-shaped dynamic pressure spiral grooves, the inert gas in the cavity can be compressed to the sealing surfaces between the atmospheric-side stationary ring and the atmospheric-side moving ring, and between the media-side stationary ring and the media-side moving ring. An air film is formed on these sealing surfaces, which has a certain rigidity, achieving a good sealing effect without liquid lubrication, providing a good guarantee for product quality control. The elastic structure provides support for the atmospheric-side moving ring and the media-side moving ring, restricting their position. The blocking structure prevents powder from entering the second stationary ring seat.
[0011] Preferably, the elastic structure includes a spring seat, a first push ring, and a second push ring mounted on the bushing. The spring seat is located between the first push ring and the second push ring. The spring seat is bolted to the outside of the bushing. A plurality of insertion holes are provided through the spring seat. A first spring is installed in each of the insertion holes. The first push ring abuts against the end of the first spring between the atmospheric side moving ring and the second push ring abuts against the end of the first spring between the medium side moving ring.
[0012] Preferably, the inner sides of both the first push ring and the second push ring are provided with a first ring groove, and a first O-ring is embedded in the first ring groove. The first O-ring is pressed against the outer wall of the bushing.
[0013] By adopting the above technical solution, a sealed connection between the bushing and the first and second push rings can be achieved through the first O-ring.
[0014] Preferably, the blocking structure includes a throttling ring and a retaining ring, the inner wall of the second stationary ring seat is integrally formed with a convex ring, the throttling ring is located between the retaining ring and the convex ring, the retaining ring is bolted to the second stationary ring seat, and the inner wall of the retaining ring is fixedly installed with multiple layers of flexible blocking rings.
[0015] The throttling ring has several slots on the side away from the retaining ring, and a second spring is installed in each of the slots. The ends of the springs are pressed against the convex ring.
[0016] By adopting the above technical solution, a dual barrier protection against powder particles on the medium side can be achieved through the flexible blocking ring inside the throttling ring and the retaining ring. The second spring ensures that the throttling ring remains in contact with the retaining ring at all times.
[0017] Preferably, a second O-ring is sealed between the first stationary ring seat and the atmospheric side stationary ring, and a third O-ring is sealed between the first stationary ring seat and the end face of the gland assembly.
[0018] By adopting the above technical solution, a sealed connection can be achieved between the first stationary ring seat, the atmospheric stationary ring, and the gland assembly through the second and third O-rings.
[0019] Preferably, a fourth O-ring is sealed between the end face of the gland assembly and the second stationary ring seat, a fifth O-ring is sealed between the second stationary ring seat and the medium-side stationary ring, and a sixth O-ring is sealed between the second stationary ring seat and the outer wall of the retaining ring.
[0020] By adopting the above technical solution, and through the use of the fourth O-ring, the fifth O-ring, and the sixth O-ring, a sealed connection can be achieved between the second stationary ring seat and the gland assembly, the medium-side stationary ring, and the retaining ring.
[0021] Preferably, both the atmospheric side stationary ring and the medium side stationary ring are made of SiC material, and the depth of the hydrodynamic spiral groove on the sealing surface of the atmospheric side stationary ring and the medium side stationary ring is 0.007~0.01mm.
[0022] By adopting the above technical solutions, the atmospheric side static ring and the dielectric side static ring made of SiC material have advantages such as wear resistance and low coefficient of friction.
[0023] Preferably, both the medium-side moving ring and the atmospheric-side moving ring are made of antimony-impregnated graphite.
[0024] By adopting the above technical solutions, the medium-side moving ring and atmospheric-side moving ring made of antimony-impregnated graphite have the advantages of wear resistance and high strength.
[0025] In summary, the dry gas sealing structure device for a horizontal sand mill disclosed in this application has at least one of the following beneficial technical effects:
[0026] 1. During equipment operation, the atmospheric side moving ring and the medium side moving ring rotate together with the bushing. Since the sealing surfaces of the atmospheric side stationary ring and the medium side stationary ring are provided with centripetally arranged vortex-shaped hydrodynamic spiral grooves, the inert gas in the cavity can be compressed to the sealing surfaces between the atmospheric side stationary ring and the atmospheric side moving ring, and between the medium side stationary ring and the medium side moving ring, forming a gas film on the sealing surfaces between the atmospheric side stationary ring and the atmospheric side moving ring, and between the medium side stationary ring and the medium side moving ring. The gas film has a certain rigidity and can achieve a good sealing effect without liquid lubrication, providing a good guarantee for product quality control.
[0027] 2. Through the elastic structure, support can be formed for the atmospheric side moving ring and the medium side moving ring, restricting the position of the atmospheric side moving ring and the medium side moving ring;
[0028] 3. The blocking structure can block the powder on the medium side, preventing powder particles from entering the interior of the second stationary ring seat. Attached Figure Description
[0029] Figure 1 This is a schematic diagram illustrating the overall structure of the sealing structure in an embodiment of this application.
[0030] Figure 2 This is a schematic diagram illustrating the arrangement of the dynamic pressure spiral grooves on the atmospheric side static ring sealing surface, as shown in the embodiments of this application.
[0031] Figure 3 This is a schematic diagram illustrating the arrangement of the dynamic pressure spiral grooves on the stationary ring sealing surface on the medium side, as shown in the embodiments of this application.
[0032] Explanation of reference numerals in the attached drawings: 1. First stationary ring seat; 2. Pressure cap assembly; 3. Second stationary ring seat; 31. Convex ring; 4. Atmospheric side stationary ring; 41. Dynamic pressure spiral groove; 5. Atmospheric side moving ring; 6. Medium side stationary ring; 7. Medium side moving ring; 8. Elastic structure; 81. Spring seat; 82. First push ring; 83. Second push ring; 84. First spring; 85. First O-ring; 9. Blocking structure; 91. Throttling ring; 92. Retaining ring; 93. Flexible blocking ring; 94. Second spring; 95. Pressure plate; 96. Limiting plate; 10. Second O-ring; 11. Third O-ring; 12. Fourth O-ring; 13. Fifth O-ring; 14. Sixth O-ring. Detailed Implementation
[0033] The following combination Figures 1-3 This application will be described in further detail.
[0034] Example
[0035] This application discloses a dry gas sealing structure device for a horizontal sand mill. (Refer to...) Figures 1-3 1. A horizontal type mainly includes a first stationary ring seat 1, a bushing, a pressure cap assembly 2 and a second stationary ring seat 3. The pressure cap assembly 2 is coaxially sleeved on the outer side wall of the bushing. A cavity for inert gas to flow is formed between the pressure cap assembly 2 and the bushing, and an air inlet communicating with the cavity is opened on the outer side wall of the pressure cap assembly 2.
[0036] The first stationary ring seat 1 and the second stationary ring seat 3 are sealed and installed at both ends of the gland assembly 2. An atmospheric stationary ring 4 and an atmospheric moving ring 5 are sealed and installed between the first stationary ring seat 1 and the bushing. A medium moving ring 7 and a medium stationary ring 6 are sealed and connected between the second stationary ring seat 3 and the bushing. An elastic structure 8 is provided to abut against the medium moving ring 7. An air film with a thickness of 0.002mm to 0.003mm is formed between the atmospheric stationary ring 4 and the atmospheric moving ring 5, and between the medium stationary ring 6 and the medium moving ring 7.
[0037] The sealing surfaces of the atmospheric side stationary ring 4 and the medium side stationary ring 6 are provided with dynamic pressure spiral grooves 41. The dynamic pressure spiral grooves 41 are arranged in a vortex shape, and the spiral directions of the dynamic pressure spiral grooves 41 on the sealing surface of the atmospheric side stationary ring 4 and the dynamic pressure spiral grooves 41 on the sealing surface of the medium side stationary ring 6 are opposite. A blocking structure 9 for blocking the medium is installed between the medium side stationary ring 6 seat and the bushing.
[0038] During equipment operation, the atmospheric-side moving ring 5 and the medium-side moving ring 7 rotate together with the bushing. Since the end faces of the atmospheric-side stationary ring 4 and the medium-side stationary ring 6 are both provided with centripetally arranged vortex-shaped dynamic pressure spiral grooves 41 (depth 0.01±0.001mm), the inert gas in the cavity can be compressed to the sealing surfaces between the atmospheric-side stationary ring 4 and the atmospheric-side moving ring 5, and between the medium-side stationary ring 6 and the medium-side moving ring 7. An air film is formed between these sealing surfaces, which has a certain rigidity and achieves a good sealing effect without liquid lubrication, providing a good guarantee for product quality control. In this embodiment, the dynamic pressure spiral grooves 41 are laser-engraved, and the number of grooves is 12.
[0039] The elastic structure 8 can provide support for the atmospheric side moving ring 5 and the medium side moving ring 7, thus restricting their positions.
[0040] The blocking structure 9 can block the powder on the medium side, preventing powder particles from entering the interior of the second stationary ring seat 3.
[0041] It should be noted that in this embodiment, both the atmospheric side stationary ring 4 and the dielectric side stationary ring 6 are made of SiC material, while both the dielectric side moving ring 7 and the atmospheric side moving ring 5 are made of antimony-impregnated graphite material.
[0042] Reference Figure 1 The elastic structure 8 includes a spring seat 81, a first push ring 82, and a second push ring 83 mounted on the bushing. The spring seat 81 is located between the first push ring 82 and the second push ring 83. The spring seat 81 is bolted to the outside of the bushing. Several insertion holes are opened through the spring seat 81. A first spring 84 is installed in each insertion hole. The first push ring 82 abuts against the end of the first spring 84 between the atmospheric side moving ring 5 and the second push ring 83 abuts against the end of the first spring 84 between the medium side moving ring 7.
[0043] Reference Figure 1 Both the first push ring 82 and the second push ring 83 have a first annular groove on their inner sides, and a first O-ring 85 is embedded in each of the first annular grooves. The first O-ring 85 abuts against the outer wall of the bushing. The first O-ring 85 enables a sealed connection between the bushing and the first push ring 82 and the second push ring 83.
[0044] Reference Figure 1 The blocking structure 9 includes a throttling ring 91 and a retaining ring 92. The inner wall of the second stationary ring seat 3 is integrally formed with a protruding ring 31. The throttling ring 91 is located between the retaining ring 92 and the protruding ring 31. The retaining ring 92 is bolted to the second stationary ring seat 3. A multi-layer flexible blocking ring 93 is fixedly installed on the inner wall of the retaining ring 92. Several slots are opened on the side of the throttling ring 91 away from the retaining ring 92. A second spring 94 is installed in each of the slots. The ends of the springs are pressed against the protruding ring 31.
[0045] In order to fix the position of the retaining ring 92, in this embodiment, the end face of the retaining ring 92 away from the throttling sleeve is bolted with a pressure plate 95, and the outer end face of the second stationary ring seat 3 is bolted with a limiting plate 96, which restricts the position of the retaining ring 92 and the pressure plate 95.
[0046] The flexible blocking ring 93 inside the throttling ring 91 and the retaining ring 92 provides dual protection against powder particles on the medium side. The second spring 94 ensures that the throttling ring 91 is always in contact with the retaining ring 92.
[0047] Reference Figure 1 A second O-ring 10 is sealed between the first stationary ring seat 1 and the atmospheric side stationary ring 4, and a third O-ring 11 is sealed between the first stationary ring seat 1 and the end face of the gland assembly 2. The second O-ring 10 and the third O-ring 11 can achieve a sealed connection between the first stationary ring seat 1, the atmospheric side stationary ring 4, and the gland assembly 2.
[0048] Reference Figure 1 A fourth O-ring 12 is sealed between the end face of the gland assembly 2 and the second stationary ring seat 3; a fifth O-ring is sealed between the second stationary ring seat 3 and the medium-side stationary ring 6; and a sixth O-ring 14 is sealed between the second stationary ring seat 3 and the outer wall of the retaining ring 92. Through the use of the fourth O-ring 12, the fifth O-ring 13, and the sixth O-ring 14, a sealed connection can be achieved between the second stationary ring seat 3 and the gland assembly 2, the medium-side stationary ring 6, and the retaining ring 92.
[0049] The implementation principle of the dry gas sealing structure device for a horizontal sand mill according to the embodiments of this application is as follows: During the operation of the equipment, the atmospheric side moving ring 5 and the medium side moving ring 7 rotate together with the bushing. Since the end faces of the atmospheric side stationary ring 4 and the medium side stationary ring 6 are provided with centripetally arranged vortex-shaped dynamic pressure spiral grooves 41, the inert gas in the cavity can be compressed to the sealing surface between the atmospheric side stationary ring 4 and the atmospheric side moving ring 5, and between the medium side stationary ring 6 and the medium side moving ring 7. An air film is formed between the sealing surfaces of the atmospheric side stationary ring 4 and the atmospheric side moving ring 5, and between the sealing surfaces of the medium side stationary ring 6 and the medium side moving ring 7. The air film has a certain rigidity and can achieve a good sealing effect without liquid lubrication, providing a good guarantee for product quality control.
[0050] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A dry gas sealing structure device for a horizontal sand mill, characterized in that, It includes a first stationary ring seat (1), a bushing, a pressure cap assembly (2) and a second stationary ring seat (3). The pressure cap assembly (2) is coaxially sleeved on the outer side wall of the bushing. A cavity for inert gas to flow is formed between the pressure cap assembly (2) and the bushing. An air inlet communicating with the cavity is opened on the outer side wall of the pressure cap assembly (2). The first stationary ring seat (1) and the second stationary ring seat (3) are sealed and installed at both ends of the gland assembly (2). An atmospheric stationary ring (4) and an atmospheric moving ring (5) are sealed and installed between the first stationary ring seat (1) and the bushing. A medium moving ring (7) and a medium stationary ring (6) are sealed and connected between the second stationary ring seat (3) and the bushing. An elastic structure (8) is provided between the medium moving ring (7) and the medium moving ring (7). An air film is formed between the sealing surfaces of the atmospheric stationary ring (4) and the atmospheric moving ring (5) and between the sealing surfaces of the medium stationary ring (6) and the medium moving ring (7). The sealing surfaces of the atmospheric side static ring (4) and the medium side static ring (6) are provided with dynamic pressure spiral grooves (41). The dynamic pressure spiral grooves (41) are arranged in a vortex shape, and the spiral directions of the dynamic pressure spiral grooves (41) on the sealing surface of the atmospheric side static ring (4) and the dynamic pressure spiral grooves (41) on the sealing surface of the medium side static ring (6) are opposite. A blocking structure (9) for blocking the medium is installed between the medium-side stationary ring (6) seat and the bushing.
2. The dry gas sealing structure device for a horizontal sand mill according to claim 1, characterized in that, The elastic structure (8) includes a spring seat (81), a first push ring (82), and a second push ring (83) mounted on the bushing. The spring seat (81) is located between the first push ring (82) and the second push ring (83). The spring seat (81) is bolted to the outside of the bushing. Several insertion holes are provided through the spring seat (81). A first spring (84) is installed in each insertion hole. The first push ring (82) abuts against the end of the first spring (84) between the atmospheric side moving ring (5). The second push ring (83) abuts against the end of the first spring (84) between the medium side moving ring (7).
3. The dry gas sealing structure device for a horizontal sand mill according to claim 2, characterized in that, The inner sides of the first push ring (82) and the second push ring (83) are provided with a first ring groove, and a first O-ring (85) is embedded in the first ring groove. The first O-ring (85) abuts against the outer wall of the bushing.
4. The dry gas sealing structure device for a horizontal sand mill according to claim 3, characterized in that, The blocking structure (9) includes a throttling ring (91) and a retaining ring (92). The inner sidewall of the second stationary ring seat (3) is integrally formed with a protruding ring (31). The throttling ring (91) is located between the retaining ring (92) and the protruding ring (31). The retaining ring (92) is bolted to the second stationary ring seat (3). The inner sidewall of the retaining ring (92) is fixedly installed with a multi-layer flexible retaining ring (93). The throttling ring (91) has several slots on the side away from the retaining ring (92), and a second spring (94) is installed in each of the slots. The ends of the springs are pressed against the convex ring (31).
5. A dry gas sealing structure device for a horizontal sand mill according to claim 4, characterized in that, A second O-ring (10) is sealed between the first stationary ring seat (1) and the atmospheric side stationary ring (4), and a third O-ring (11) is sealed between the first stationary ring seat (1) and the end face of the gland assembly (2).
6. The dry gas sealing structure device for a horizontal sand mill according to claim 5, characterized in that, A fourth O-ring (12) is sealed between the end face of the gland assembly (2) and the second stationary ring seat (3), a fifth O-ring is sealed between the second stationary ring seat (3) and the medium-side stationary ring (6), and a sixth O-ring (14) is sealed between the second stationary ring seat (3) and the outer wall of the retaining ring (92).
7. The dry gas sealing structure device for a horizontal sand mill according to claim 1, characterized in that, Both the atmospheric side stationary ring (4) and the medium side stationary ring (6) are made of SiC material, and the depth of the dynamic pressure spiral groove (41) on the sealing surface of the atmospheric side stationary ring (4) and the medium side stationary ring (6) is 0.007~0.01mm.
8. The dry gas sealing structure device for a horizontal sand mill according to claim 1, characterized in that, Both the medium-side moving ring (7) and the atmospheric-side moving ring (5) are made of antimony-impregnated graphite.