Double-end sealing device for main shaft of tubular centrifuge

Abstract

The utility model discloses a kind of tubular centrifuge main shaft double-end sealing devices, it is related to tubular centrifuge technical field, including centrifuge main body, the upper cover is fixedly installed in centrifuge main body front side, the shaft seat is fixedly installed in the upper cover top and penetrates, the spring is set in the shaft seat lower end hole, the main shaft is set in the shaft seat bore, upper end sealing assembly, the upper end sealing assembly is installed in the upper end of shaft seat, and for the upper end of shaft seat is sealed, filtering component, the filtering component is installed on the inner wall of upper cover, and for filtering the impurity in material.The utility model, by the spring of compression state extrusion isolation cover, so that isolation ring can be closely attached annular groove on isolation cover, improve sealing, the edge of isolation cover also closely attached annular groove on the top of isolation plate, avoid the impurity in material through the gap between isolation cover and isolation plate into between sealing seat and first sealing ring, avoid the impurity intensifies the abrasion of sealing end face.

Description

Technical Field

[0001] This utility model relates to the field of tubular centrifuge technology, and in particular to a double-end sealing device for the main shaft of a tubular centrifuge. Background Technology

[0002] Due to the high-speed rotation (typically exceeding 10,000 r / min), the seals at both ends of the main shaft of tubular centrifuges (the upper end contacts the material / separation liquid, and the lower end connects to the transmission system) must simultaneously meet the requirements of preventing leakage (material and lubricating oil), preventing impurities from entering, and adapting to high-speed friction. Among these, mechanical seals are one of the best sealing performance methods in rotating equipment such as tubular centrifuges. However, in practical applications, their inherent design flaws and limitations in adaptability to operating conditions can lead to many problems.

[0003] The current mainstream mechanical seal structure (composed of a dynamic ring, a stationary ring, and a spring) has revealed obvious defects in actual working conditions: when handling materials containing crystalline particles and fibrous impurities, solid impurities can easily penetrate the liquid film protective layer on the sealing end face. More seriously, the gaps formed by the wear of impurities can cause double leakage: on the one hand, the material seeps into the transmission system and contaminates the lubricating oil, and on the other hand, the lubricating oil seeps into the material, affecting its purity and even causing the entire batch of products to be scrapped. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a double-end sealing device for the main shaft of a tubular centrifuge, which solves the problem of material impurities entering the end faces of the dynamic and static rings, leading to severe wear and double leakage.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A double-end sealing device for the main shaft of a tubular centrifuge includes a centrifuge body, a top cover fixedly installed on the front side of the centrifuge body, a shaft seat through and fixedly installed on the top of the top cover, a spring provided in the lower end hole of the shaft seat, and a main shaft provided in the inner hole of the shaft seat; An upper sealing assembly is installed on the upper end of the shaft seat and is used to seal the upper end of the shaft seat. A filter assembly, which is installed on the inner wall of the top cover and is used to filter impurities in the material; The lower end sealing assembly is installed in the lower inner wall of the shaft seat and is used to seal the gap between the shaft seat and the main shaft.

[0006] Preferably, the upper sealing assembly includes: An end cap is fixedly installed on the upper end of the shaft seat. The main shaft passes through the end cap. An isolation sleeve is fixedly installed on the top of the end cap. The other end of the isolation sleeve is fixedly connected to the centrifuge body. A third sealing ring is provided on the inner wall of the upper end of the shaft seat. The third sealing ring is sleeved on the outer wall of the main shaft.

[0007] Preferably, the filtering component includes: An isolation plate is fixedly installed on the top inner wall of the upper cover. The main shaft passes through the isolation plate. An isolation cover is provided on the top of the isolation plate and is fixedly installed on the outer wall of the main shaft. An isolation ring is fixedly installed on the top of the isolation plate and is movably connected to the isolation cover. A filter screen is fixedly installed at the bottom of the isolation plate. The filter screen is located outside the isolation ring and inside the isolation cover.

[0008] Preferably, the lower end sealing assembly includes: The first sealing ring is slidably mounted on the lower inner wall of the shaft seat. A sealing seat is provided on the top of the first sealing ring, and the sealing seat is fixedly mounted on the outer wall of the spindle. The first sealing ring is interference-fitted with the inner wall of the shaft seat.

[0009] Preferably, one end of the spring is fixedly connected to the first sealing ring, and the other end of the spring abuts against the top of the isolation cover.

[0010] Preferably, the contact surface between the sealing seat and the first sealing ring is an inclined surface.

[0011] Preferably, a second sealing ring is fixedly installed around the top edge of the isolation plate, the second sealing ring is in contact with the inner wall of the upper cover, and a bearing is fixedly installed on the inner wall of the shaft seat, the bearing being sleeved on the outer wall of the main shaft.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. By compressing the isolation cover with a spring, the isolation ring can be tightly pressed against the annular groove on the isolation cover, improving the sealing performance. The edge of the isolation cover will also be tightly pressed against the annular groove on the top of the isolation plate, preventing impurities in the material from entering the sealing seat and the first sealing ring through the gap between the isolation cover and the isolation plate. When the material enters the inside of the upper cover, the filter screen plate allows the material with impurities filtered out by the filter screen plate to pass through the filter screen plate and enter the inner side of the isolation cover. This makes the pressure difference on both sides of the interface between the isolation cover and the isolation plate close, reducing the possibility of impurities seeping in due to excessive pressure difference between the inside and outside of the isolation cover. It also prevents particulate impurities from entering the sealing end face of the sealing seat and the first sealing ring with the medium, thus aggravating wear. Attached Figure Description

[0013] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a bottom view of the overall structure of this utility model; Figure 3 This is a schematic diagram of the regional structure of the upper cover in this utility model; Figure 4 This is a cross-sectional view of the structure of the upper cover in this utility model; Figure 5 This is a schematic diagram of the regional structure of the isolation ring in this utility model; Figure 6 This is a schematic diagram of the regional structure of the isolation cover in this utility model; Figure 7 In this utility model Figure 4 Enlarged view of point A.

[0015] Legend: 1. Shaft seat; 2. Top cover; 3. Isolation sleeve; 4. Sealing seat; 5. First sealing ring; 6. Main shaft; 7. Spring; 8. Isolation cover; 9. Isolation plate; 10. Filter screen; 11. Isolation ring; 12. Second sealing ring; 13. Third sealing ring; 14. Bearing; 15. End cover; 16. Centrifuge body. Detailed Implementation

[0016] This application provides a double-end sealing device for the main shaft of a tubular centrifuge, which effectively solves the problem of material impurities entering the end faces of the dynamic and static rings, leading to severe wear and double leakage.

[0017] Example like Figure 1 - Figure 7 As shown, the technical solution in this application embodiment effectively solves the technical problem of material impurities entering the end faces of the moving ring and the stationary ring, leading to severe wear and double leakage. The overall idea is as follows: To address the problems existing in the prior art, this utility model provides a double-end sealing device for the main shaft of a tubular centrifuge, including a centrifuge body 16, an upper cover 2 fixedly installed on the front side of the centrifuge body 16, a shaft seat 1 through and fixedly installed on the top of the upper cover 2, a spring 7 installed in the lower end hole of the shaft seat 1, and a main shaft 6 installed in the inner hole of the shaft seat 1. The upper sealing assembly is installed on the upper end of the shaft seat 1 and is used to seal the upper end of the shaft seat 1. A filter assembly is installed on the inner wall of the upper cover 2 and is used to filter impurities in the material. The lower end sealing assembly is installed in the lower inner wall of the shaft seat 1 and is used to seal the gap between the shaft seat 1 and the main shaft 6.

[0018] Furthermore, the upper sealing assembly includes: End cover 15 is fixedly installed on the upper end of shaft seat 1. Main shaft 6 passes through end cover 15. Isolation sleeve 3 is fixedly installed on the top of end cover 15. The other end of isolation sleeve 3 is fixedly connected to centrifuge body 16. A third sealing ring 13 is provided on the inner wall of the upper end of shaft seat 1. The third sealing ring 13 is sleeved on the outer wall of main shaft 6.

[0019] Furthermore, the filtering components include: The isolation plate 9 is fixedly installed on the top inner wall of the upper cover 2. The main shaft 6 passes through the isolation plate 9. An isolation cover 8 is provided on the top of the isolation plate 9. The isolation cover 8 is fixedly installed on the outer wall of the main shaft 6. An isolation ring 11 is fixedly installed on the top of the isolation plate 9. The isolation ring 11 is movably connected to the isolation cover 8. A filter screen plate 10 is fixedly installed at the bottom of the isolation plate 9. The filter screen plate 10 is located outside the isolation ring 11.

[0020] Furthermore, the lower sealing assembly includes: The first sealing ring 5 is slidably installed on the lower inner wall of the shaft seat 1. A sealing seat 4 is provided on the top of the first sealing ring 5. The sealing seat 4 is fixedly installed on the outer wall of the main shaft 6. The first sealing ring 5 is interference-fitted with the inner wall of the shaft seat 1.

[0021] Furthermore, one end of the spring 7 is fixedly connected to the first sealing ring 5, and the other end of the spring 7 abuts against the top of the isolation cover 8.

[0022] Furthermore, the contact surfaces of the sealing seat 4 and the first sealing ring 5 are inclined surfaces, and the sealing seat 4 and the first sealing ring 5 are interference fit.

[0023] Furthermore, a second sealing ring 12 is fixedly installed around the top edge of the isolation plate 9, and the second sealing ring 12 contacts the inner wall of the upper cover 2.

[0024] Furthermore, a bearing 14 is fixedly installed on the inner wall of the bearing seat 1, and the bearing 14 is sleeved on the outer wall of the main shaft 6.

[0025] in: Shaft seat 1: It is a stainless steel round tube structure, which is fixed to the upper cover 2 by welding. A flange ring is welded to the upper end, and a lubricant injection hole is opened on the outer wall. Top cover 2: Made of stainless steel, it serves as the top cover for the material separation chamber; Isolation sleeve 3: It is a rubber corrugated telescopic tube, and its upper and lower ends are fixed to the centrifuge body 16 and the end cap 15 respectively by adhesive bonding; Sealing seat 4: It is an annular polyurethane sealing ring. The inner wall is bonded to the outer wall of the main shaft 6. The outer wall is a 45° inclined surface, which is aligned with the lubricant injection hole on the shaft seat 1. An annular groove is provided at the bottom. First sealing ring 5: It is an annular polyurethane sealing ring with a 45° inclined inner wall and an annular protrusion on the top, which cooperates with the annular groove at the bottom of the sealing seat 4 to block the lubricant. The outer wall is interference-fitted with the inner wall of the shaft seat 1. Main spindle 6: The outer diameter of the metal shaft is smaller than the inner diameter of the bearing seat 1; Spring 7: It adopts Hastelloy alloy spring, which has the function of resisting strong acid corrosion. One end is fixed to the first sealing ring 5 by metal bracket and bolt, and the other end abuts against the top of the isolation cover 8. The initial state is the compressed state. Isolation cover 8: It is an annular groove structure made of polyurethane. The inner wall is fixed by welding the main shaft 6. The bottom of the outer wall is rounded and engages with the annular groove on the top of the isolation plate 9. The inner wall of the top is provided with an annular groove. Isolation plate 9: It is a ring structure made of Hastelloy alloy, with a through hole in the middle. A filter screen plate 10 is installed in the through hole and fixed to the upper cover 2 by bolts. Filter screen 10: It uses metal woven mesh as filter material and is fixed to the through holes of the isolation plate 9 by metal brackets and bolts to intercept impurities in the material; Isolation ring 11: It is an annular Hastelloy plate with a rounded corner at the top, which engages with the annular groove on the inner wall of the top of the isolation cover 8; The second sealing ring 12 is an annular rubber sealing ring. The second sealing ring 12 is squeezed by the isolation plate 9, and then the second sealing ring 12 is tightly fitted to the inner wall of the upper cover 2, so that the gap at the joint between the upper cover 2 and the isolation plate 9 is sealed. The third sealing ring 13 is made of polytetrafluoroethylene and is used to seal the gap between the end cover 15 and the main shaft 6. Bearing 14: is a stainless steel ball bearing; End cap 15: It is an annular stainless steel flange structure that presses down on the top of the third sealing ring 13.

[0026] Working principle: The first step is to cover the main shaft 6 with the isolation sleeve 3, and then connect the two ends of the isolation sleeve 3 to the centrifuge body 16 and the end cover 15 respectively, so that the third sealing ring 13 used to seal the upper end of the shaft seat 1 is isolated from the outside world, preventing dust from falling into the gap between the third sealing ring 13 and the main shaft 6, which would lead to increased wear.

[0027] The second step involves compressing the first sealing ring 5 with the compressed spring 7, causing the first sealing ring 5 to fit tightly against the sealing seat 4, thereby sealing the gap between the lower end of the shaft seat 1 and the main shaft 6.

[0028] Thirdly, the spring 7, under compression, presses the isolation cover 8, causing the outer side of the isolation cover 8 to slightly tilt downwards. When the isolation cover 8 and the isolation plate 9 rotate relative to each other, the isolation ring 11 can tightly fit the annular groove on the isolation cover 8, improving the sealing performance. The edge of the isolation cover 8 will also tightly fit the annular groove on the top of the isolation plate 9, preventing impurities in the material from entering the sealing seat 4 and the first sealing ring 5 through the gap between the isolation cover 8 and the isolation plate 9. When the material enters the interior of the upper cover 2, the filter screen 10 is set up so that the material whose impurities are filtered out by the filter screen 10 passes through the filter screen 10 and enters the inner side of the isolation cover 8. This makes the pressure difference on both sides of the interface between the isolation cover 8 and the isolation plate 9 close, thereby reducing the possibility of impurities seeping in due to excessive pressure difference between the inside and outside of the isolation cover 8.

[0029] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A double-end sealing device for the spindle of a tubular centrifuge, characterized in that, include: Centrifuge body (16), with a top cover (2) fixedly installed on the front side of the centrifuge body (16), a shaft seat (1) is fixedly installed through the top of the top cover (2), a spring (7) is provided in the lower end hole of the shaft seat (1), and a main shaft (6) is provided in the inner hole of the shaft seat (1). Upper sealing assembly, which is installed on the upper end of the shaft seat (1) and is used to seal the upper end of the shaft seat (1); A filter assembly is installed on the inner wall of the top cover (2) and is used to filter impurities in the material; The lower end sealing assembly is installed in the lower end inner wall of the shaft seat (1) and is used to seal the gap between the shaft seat (1) and the main shaft (6).

2. The double-end sealing device for the spindle of a tubular centrifuge as described in claim 1, characterized in that, The upper sealing assembly includes: End cap (15), the end cap (15) is fixedly installed on the upper end of the shaft seat (1), the main shaft (6) passes through the end cap (15), the top of the end cap (15) is fixedly installed with an isolation sleeve (3), the other end of the isolation sleeve (3) is fixedly connected to the centrifuge body (16), the upper inner wall of the shaft seat (1) is provided with a third sealing ring (13), the third sealing ring (13) is sleeved on the outer wall of the main shaft (6).

3. The double-end sealing device for the spindle of a tubular centrifuge as described in claim 1, characterized in that, The filtering component includes: An isolation plate (9) is fixedly installed on the top inner wall of the upper cover (2). The main shaft (6) passes through the isolation plate (9). An isolation cover (8) is provided on the top of the isolation plate (9). The isolation cover (8) is fixedly installed on the outer wall of the main shaft (6). An isolation ring (11) is fixedly installed on the top of the isolation plate (9). The isolation ring (11) is movably connected to the isolation cover (8). A filter screen plate (10) is fixedly installed at the bottom of the isolation plate (9). The filter screen plate (10) is located outside the isolation ring (11).

4. The double-end sealing device for the spindle of a tubular centrifuge as described in claim 1, characterized in that, The lower sealing assembly includes: The first sealing ring (5) is slidably installed on the lower inner wall of the shaft seat (1). A sealing seat (4) is provided on the top of the first sealing ring (5). The sealing seat (4) is fixedly installed on the outer wall of the main shaft (6). The first sealing ring (5) is interference-fitted with the inner wall of the shaft seat (1).

5. The double-end sealing device for the spindle of a tubular centrifuge as described in claim 1, characterized in that: One end of the spring (7) is fixedly connected to the first sealing ring (5), and the other end of the spring (7) abuts against the top of the isolation cover (8).

6. The double-end sealing device for the spindle of a tubular centrifuge as described in claim 4, characterized in that: The contact surface between the sealing seat (4) and the first sealing ring (5) is an inclined surface.

7. The double-end sealing device for the spindle of a tubular centrifuge as described in claim 3, characterized in that: A second sealing ring (12) is fixedly installed around the top edge of the isolation plate (9), and the second sealing ring (12) contacts the inner wall of the cover (2).

8. The double-end sealing device for the spindle of a tubular centrifuge as described in claim 1, characterized in that: The bearing (14) is fixedly installed on the inner wall of the bearing seat (1), and the bearing (14) is sleeved on the outer wall of the main shaft (6).

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