Double-end-face mechanical sealing device for centrifugal machine
Through the design of the static ring, spring, push ring and other components of the double-end mechanical sealing device, combined with the desalted water cooling and stationary structure, the problem of media backflow is solved, and efficient sealing and long-life centrifuge operation is achieved.
Patent Information
- Application Number
- CN202422310379.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-23
AI Technical Summary
The existing mechanical sealing devices are prone to media back to the cooling water circulation system in centrifuges, resulting in cooling water contamination. Especially in bisphenol A adduct centrifuges, light components are prone to coking after volatilization, blocking the overflow components.
The dual-end mechanical sealing device is adopted, including the matching design of static ring, spring, push ring, floating ring and other components. The sealing is ensured by injecting desalted water as a cooling medium. It also adopts a shared spring design and a stationary structure to prevent media leakage. At the same time, the right-hand single-head thread design is used to pump impurities to reduce wear.
Effectively prevent media leakage, improve sealing, extend service life, ensure the normal operation of the centrifuge, reduce maintenance costs, and improve the reliability and practicality of the device.
Smart Images
Figure CN223136956U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mechanical equipment manufacturing, in particular to a double-end mechanical seal device for a centrifuge. Background Technique
[0002] At present, mechanical seals are widely used in the sealing of power input shafts of equipment such as pumps, compressors, centrifuges, and agitators in the fields of petrochemical, electric power, aviation, etc. During operation, mechanical seals are widely used in the sealing of liquid media because of their extremely low leakage rate, high reliability, long service life, low power consumption, and low operation and maintenance costs. Under different working condition parameters, not only different rotational speeds are required, but also the leakage of the sealed medium needs to be controlled. With the development of mechanical seal technology, its trend of developing in different industries is becoming increasingly prominent, and mechanical seals will occupy a more important position. As enterprises continuously develop high-value-added mechanical seal products that adapt to various working condition parameters, the quality requirements for products are also gradually increasing.
[0003] As a horizontal screw sedimentation screen centrifuge, the bisphenol A adduct centrifuge faces a series of challenges during operation. Its mechanical seal often has the problem of medium backflow into the sealing water system, which causes pollution of the cooling circulating water. Especially after the light components of the adduct volatilize, it is easy to form coke in the sealing water system, which further leads to blockage problems of flow components such as filters, flow meters, and even water pumps in the water system. Content of the Utility Model
[0004] The purpose of the utility model is to solve the disadvantages existing in the prior art, and to propose a double-end mechanical seal device for a centrifuge, aiming to improve the problem that most existing mechanical seal devices will have medium backflow into the cooling water circulation system, thus causing pollution of the cooling water.
[0005] To achieve the above purpose, the utility model provides the following technical solution: A double-end mechanical seal device for a centrifuge, including a housing, a shaft sleeve is fixedly connected inside the housing, a snap ring is fixedly connected inside the shaft sleeve, a sealing box one is fixedly connected inside the shaft sleeve, a push ring is slidably connected to the outer wall of the sealing box one, a stationary ring one is fixedly connected to the outer wall of the sealing box one, a transmission ring is fixedly connected inside the shaft sleeve, an O-ring one is fixedly connected inside the transmission ring, an O-ring two is fixedly connected inside the transmission ring, a stationary ring two is fixedly connected inside the sealing box one, a spring one is arranged inside the sealing box one, both ends of the spring one are fixedly connected inside the push ring, a spring two is arranged inside the sealing box one, a floating ring is rotatably connected inside the sealing box one, a pressing plate is rotatably connected to the outer wall of the floating ring, and a connecting component is arranged inside the pressing plate, and the connecting component is used to fix the pressing plate inside the floating ring.
[0006] Furthermore, the connecting component includes a first screw, and the outer wall of the first screw is threadedly connected to the inside of the pressing plate.
[0007] Furthermore, one end of the second spring is fixedly connected to the inside of the first sealing box, and the other end of the second spring is fixedly connected to the inside of the floating ring.
[0008] Furthermore, a movable ring is rotatably connected to the outer wall of the bushing, and the inside of the movable ring is rotatably connected to the outer wall of the transmission ring.
[0009] Furthermore, a second screw is threadedly connected to the inside of the bushing, and a positioning block is fixedly connected to the outer wall of the transmission ring.
[0010] Furthermore, a third screw is threadedly connected to the inside of the positioning block, and the outer wall of the third screw is threadedly connected to the inside of the transmission ring.
[0011] Furthermore, a gland is slidably connected to the outer wall of the first sealing box, a connecting bolt is threadedly connected to the inside of the gland, and the outer wall of the connecting bolt is threadedly connected to the inside of the first sealing box.
[0012] Furthermore, a second sealing box is provided on the outer wall of the gland, and a transmission pin is slidably connected to the inside of the movable ring.
[0013] The utility model has the following beneficial effects:
[0014] 1. In the utility model, firstly, through the cooperation among the second stationary ring, the first stationary ring, the first spring, the second spring, the pushing ring, the pressing plate and the floating ring, the effect of tightly sealing the whole device is achieved, preventing the leakage and overflow of the sealing medium, solving the problem that most of the existing mechanical sealing devices will have the medium flowing back into the cooling water circulation system, thus causing the pollution of the cooling water, improving the sealing performance of the device, and ensuring the normal operation of the centrifuge.
[0015] 2. In the utility model, through the bushing, the first sealing box, the gland, the positioning block, the connecting bolt, the transmission ring and the third screw, the effect of reducing the wear of the secondary end face is achieved, avoiding the contact between the spring and the solid particles and impurities in the medium. At the same time, the overall installation of the device is accurate and the disassembly is convenient, improving the practicability of the device and prolonging the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is a cross-sectional view of the internal structure of a double-end mechanical sealing device for a centrifuge proposed by the utility model;
[0017] Figure 2 is Figure 1 the enlarged view of part A in
[0018] Figure 3 is Figure 1 an enlarged view of part B in
[0019] Legend:
[0020] 1. First screw; 2. Bush; 3. Movable ring; 4. Snap ring; 5. First sealing box; 6. Pushing ring; 7. Second screw; 8. First static ring; 9. Transmission ring; 10. Positioning block; 11. Third screw; 12. Connecting bolt; 13. Gland; 14. Transmission pin; 15. First O-ring; 16. Second O-ring; 17. Second sealing box; 18. Second static ring; 19. First spring; 20. Second spring; 21. Floating ring; 22. Pressure plate; 23. Housing. Specific embodiments
[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0022] Referring to Figures 1 - 3 , an embodiment provided by the present invention: A double-ended mechanical seal device for a centrifuge, including a housing 23, a bush 2 fixedly connected inside the housing 23, a snap ring 4 fixedly connected inside the bush 2, a first sealing box 5 fixedly connected inside the bush 2, a pushing ring 6 slidably connected to the outer wall of the first sealing box 5, a first static ring 8 fixedly connected to the outer wall of the first sealing box 5, a transmission ring 9 fixedly connected inside the bush 2, a first O-ring 15 fixedly connected inside the transmission ring 9, a second O-ring 16 fixedly connected inside the transmission ring 9, a second static ring 18 fixedly connected inside the first sealing box 5, a first spring 19 arranged inside the first sealing box 5, both ends of the first spring 19 fixedly connected inside the pushing ring 6, a second spring 20 arranged inside the first sealing box 5, a floating ring 21 rotatably connected inside the first sealing box 5, a pressure plate 22 rotatably connected to the outer wall of the floating ring 21, and a connecting component arranged inside the pressure plate 22 for fixing the pressure plate 22 inside the floating ring 21; one end of the second spring 20 is fixedly connected inside the first sealing box 5, and the other end of the second spring 20 is fixedly connected inside the floating ring 21;
[0023] Specifically, when the entire device needs to be tightly sealed, key components such as static rings, springs, push rings 6, floating rings 21, and pressing plates 22 are installed on the outer walls of the first sealing box 5 and the second sealing box 17. These components work together to ensure the efficiency and safety of the device during operation. First, the design of injecting demineralized water into the sealing cavity as a cooling circulation medium is to effectively lubricate and cool the friction pair end faces during the operation of the device. Demineralized water usually has a relatively high pressure, which helps to maintain a good lubrication state in a high-pressure environment and avoid contaminating the material medium inside the equipment. The end face of the static ring is often designed with hydrodynamic pressure grooves, which not only helps to reduce friction loss but also effectively maintains the lubrication state of the end face, thereby further improving the sealing efficiency and extending the service life of the seal. At the same time, it effectively prevents the leakage and spillage of the sealing medium, improves the overall sealing performance of the device, and ensures the stability and reliability of the centrifuge during operation.
[0024] Referring to Figures 1 - 3 , the connection components include a first screw 1, the outer wall of the first screw 1 is threadedly connected inside the pressing plate 22; the outer wall of the bushing 2 is rotatably connected with a movable ring 3, and the inside of the movable ring 3 is rotatably connected to the outer wall of the transmission ring 9; the inside of the bushing 2 is threadedly connected with a second screw 7, and the outer wall of the transmission ring 9 is fixedly connected with a positioning block 10; the inside of the positioning block 10 is threadedly connected with a third screw 11, and the outer wall of the third screw 11 is threadedly connected inside the transmission ring 9; the outer wall of the first sealing box 5 is slidably connected with a gland 13, the inside of the gland 13 is threadedly connected with a connecting bolt 12, and the outer wall of the connecting bolt 12 is threadedly connected inside the first sealing box 5; the outer wall of the gland 13 is provided with a second sealing box 17, and the inside of the movable ring 3 is slidably connected with a transmission pin 14;
[0025] Specifically, by adopting a common spring design in the device, it is ensured that the spring force is evenly distributed during operation to keep the friction pair end faces in close contact, thereby effectively preventing the leakage of the material medium. This can not only provide continuous sealing pressure but also maintain stability under different working conditions, ensuring the safety and reliability of the long-term operation of the device. At the same time, the static design of the device can effectively resist the centrifugal force generated during operation and prevent the material medium from accumulating on the friction pair end faces, reducing the risk of material medium leakage and maintaining the reliability and stability of the seal. The outer diameter of the transmission ring 9 of the device adopts a right-handed single-start thread design, so that during the operation of the device, trace impurities can be effectively pumped to the outside of the device, which effectively prevents the accumulation of the material medium in the sealed environment, avoids the damage of solid particles and impurities to the sealing system, and significantly improves the service life and reliability of the mechanical seal. In addition, the sealing box, bushing 2, transmission ring 9, and gland 13 are precisely connected and assembled through the positioning block 10, screws, and connecting bolts 12, which not only ensures the installation accuracy of the device but also greatly simplifies the disassembly process, improves the practicality of the device, and extends its service life.
[0026] Working principle: First, the outer walls of the first sealing box 5 and the second sealing box 17 are installed with the second static ring 18, the first static ring 8, the first spring 19, the push ring 6, the floating ring 21, the second spring 20, and the pressing plate 22. When the whole device needs to be tightly sealed, desalted water is injected into the sealing cavity as a cooling circulating medium, and its pressure is usually higher than the internal pressure of the sealing cavity. Desalted water can not only effectively lubricate and cool the end faces of the friction pairs, but also will not contaminate the material medium in the equipment. The end face of the static ring often has a hydrodynamic pressure groove, which helps to maintain a good lubrication state, further improve the sealing performance and extend the service life of the sealing parts, so as to achieve the effect of tightly sealing the whole device, prevent the leakage and overflow of the sealing medium, improve the sealing performance of the device, ensure the normal operation of the centrifuge, and then through the design of using the common first spring 19 in the device, it is ensured that under the operating state, the spring force is evenly distributed, and the end faces of the friction pairs are always kept in close contact, so as to effectively prevent the leakage of the material medium. At the same time, the device adopts a static design, which can prevent the material medium from accumulating on the end faces of the friction pairs under the action of centrifugal force during operation, further reduce the leakage risk of the material medium, and maintain the reliability and stability of the seal. Then, the outer diameter of the transmission ring 9 of the device adopts a right-handed single-thread, which ensures that during the operation of the device, trace impurities can be pumped out of the device, effectively preventing the accumulation of solid particles and impurities of the material medium in the sealed environment, greatly improving the service life and reliability of the mechanical seal, so as to achieve the effect of reducing the wear of the secondary end face, avoiding the contact between the spring and the solid particles and impurities in the medium. At the same time, the first sealing box 5, the shaft sleeve 2, the transmission ring 9 and the gland 13 are connected and assembled through the positioning block 10, the third screw 11 and the connecting bolt 12, so as to be accurately installed and disassembled conveniently, improve the practicability of the device, and extend the service life of the device.
[0027] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A double-ended mechanical seal device for a centrifuge, comprising a housing (23), characterized in that: A bushing (2) is fixedly connected inside the housing (23). A snap ring (4) is fixedly connected inside the bushing (2). A first sealing box (5) is fixedly connected inside the bushing (2). A push ring (6) is slidably connected to the outer wall of the first sealing box (5). A first stationary ring (8) is fixedly connected to the outer wall of the first sealing box (5). A transmission ring (9) is fixedly connected inside the bushing (2). A first O-ring (15) is fixedly connected inside the transmission ring (9). A second O-ring (16) is fixedly connected inside the transmission ring (9). A second stationary ring (18) is fixedly connected inside the first sealing box (5). A first spring (19) is arranged inside the first sealing box (5). Both ends of the first spring (19) are fixedly connected inside the push ring (6). A second spring (20) is arranged inside the first sealing box (5). A floating ring (21) is rotatably connected inside the first sealing box (5). A pressing plate (22) is rotatably connected to the outer wall of the floating ring (21). A connecting component is arranged inside the pressing plate (22), and the connecting component is used to fix the pressing plate (22) inside the floating ring (21).
2. The double-ended mechanical seal device for a centrifuge according to claim 1, characterized in that: The connecting component includes a first screw (1), and the outer wall of the first screw (1) is threadedly connected inside the pressing plate (22).
3. The double-end mechanical seal device for a centrifuge according to claim 2, characterized in that: One end of the second spring (20) is fixedly connected inside the first sealing box (5), and the other end of the second spring (20) is fixedly connected inside the floating ring (21).
4. A double-ended mechanical seal device for a centrifuge according to claim 3, characterized in that: An activity ring (3) is rotatably connected to the outer wall of the bushing (2), and the inside of the activity ring (3) is rotatably connected to the outer wall of the transmission ring (9).
5. The double-end mechanical seal device for a centrifuge according to claim 4, characterized in that: A second screw (7) is threadedly connected inside the bushing (2), and a positioning block (10) is fixedly connected to the outer wall of the transmission ring (9).
6. The double-ended mechanical seal device for a centrifuge according to claim 5, characterized in that: A third screw (11) is threadedly connected inside the positioning block (10), and the outer wall of the third screw (11) is threadedly connected inside the transmission ring (9).
7. A double-ended mechanical seal device for a centrifuge according to claim 6, characterized in that: A gland (13) is slidably connected to the outer wall of the first sealing box (5), and a connecting bolt (12) is threadedly connected inside the gland (13), and the outer wall of the connecting bolt (12) is threadedly connected inside the first sealing box (5).
8. A double-ended mechanical seal device for a centrifuge according to claim 7, characterized in that: A second sealing box (17) is arranged on the outer wall of the gland (13), and a transmission pin (14) is slidably connected inside the activity ring (3).