A shaft end leakage prevention structure and a low-temperature evaporation crystallization device applying the same
By installing a pressure balancing pipeline between the lubricating oil tank and the pressure vessel, and utilizing the lubricating oil pipeline between the lubricating oil tank and the bearing chamber to achieve pressure balance, the problem of material leakage at the shaft end in the low-temperature evaporation crystallization equipment is solved, thus improving the safety of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG WANHONG ECOLOGICAL TECHNOLOGY CO LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-06-09
AI Technical Summary
In low-temperature evaporation crystallization equipment, material leakage is prone to occur at the shaft end, especially under negative pressure, leading to environmental pollution.
A pressure balancing pipeline is installed between the lubricating oil tank and the pressure vessel. The pressure balance between the lubricating oil tank and the pressure vessel is achieved through the lubricating oil pipeline between the lubricating oil tank and the bearing chamber. Under the action of pressure balance, the lubricating oil seals the shaft end to prevent material leakage.
It effectively prevents harmful materials inside the pressure vessel from leaking out from the shaft end, thus improving the safety of the low-temperature evaporation crystallization equipment.
Smart Images
Figure CN224339481U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of shaft end anti-leakage technology, specifically to a shaft end anti-leakage structure and a low-temperature evaporation crystallization device using the structure. Background Technology
[0002] Low-temperature evaporation crystallization equipment is an industrial device that achieves solid-liquid separation by lowering the boiling point of a solution under negative pressure. It is commonly used for processing high-salt and hazardous materials and is widely applied in various fields such as chemical, pharmaceutical, food, and environmental protection. The crystallization kettle, as the core component of this equipment, operates as follows: After the material is fed into the crystallization kettle, the kettle body is evacuated and heated, causing the material to boil at a lower temperature. The generated steam flows to the condenser heat exchanger, while the material inside the kettle gradually concentrates and crystallizes. A rotating shaft is installed inside the crystallization kettle, with scrapers mounted on it. A power unit drives the shaft to rotate, causing the scrapers to stir the material, ensuring uniform heating, and simultaneously scraping off the crystals adhering to the inner wall of the kettle.
[0003] To support the two ends of the rotating shaft, each end of the crystallizer has a bearing chamber. A connecting hole is provided between the crystallizer body and the bearing chamber. The end of the rotating shaft extends into the bearing chamber through the connecting hole, and a bearing supporting the end of the rotating shaft is installed in the bearing chamber. A sealing device is provided between the rotating shaft and the connecting hole. The crystallizer is usually maintained at a negative pressure environment, but under certain circumstances (such as vacuum system shutdown, abnormal chemical reaction, uncontrolled heat input, or obstruction of the exhaust pipe), positive pressure may occur inside the crystallizer. In this case, despite the sealing effect of the sealing device, a small amount of material may still enter the bearing chamber through the gap between the rotating shaft and the connecting hole, and then flow out of the bearing chamber, causing leakage. Since the material inside the crystallizer is usually hazardous, leakage will lead to environmental pollution.
[0004] In view of the above problems, it is necessary to design a shaft end anti-leakage structure. This structure can be applied in low-temperature evaporation crystallization equipment or other equipment with anti-leakage requirements to prevent materials in pressure vessels (such as crystallizers, stirring tanks, etc.) from leaking outward from the shaft end. Utility Model Content
[0005] The purpose of this invention is to solve the problem in the prior art that materials in pressure vessels are prone to leaking outward from the shaft end.
[0006] To achieve the above objectives, the utility model discloses a shaft end anti-leakage structure, which includes a pressure vessel, a bearing chamber at the end of the pressure vessel, a rotating shaft inside the pressure vessel, a connecting hole between the pressure vessel and the bearing chamber, the end of the rotating shaft extending into the bearing chamber through the connecting hole, a bearing for supporting the end of the rotating shaft installed in the bearing chamber, a sealing device between the rotating shaft and the connecting hole, the shaft end anti-leakage structure also includes a lubricating oil tank, a lubricating oil pipeline connecting the lubricating oil tank and the bearing chamber, and a pressure balancing pipeline connecting the lubricating oil tank and the pressure vessel. With the above structure, the pressure balancing pipeline connects the lubricating oil tank and the pressure vessel, balancing their pressures. Since a lubricating oil pipeline connects the lubricating oil tank and the bearing chamber, the pressures of the lubricating oil tank and the bearing chamber are balanced, ultimately balancing the pressures of the bearing chamber and the pressure vessel. The lubricating oil in the lubricating oil tank enters the bearing chamber through the lubricating oil pipeline. This lubricating oil not only lubricates the bearing but also, under the pressure balancing effect, seals the shaft end, effectively preventing harmful materials from the pressure vessel from leaking out from the shaft end.
[0007] Furthermore, the lubricating oil tank has two chambers spaced apart on the left and right sides. One is an isobaric buffer chamber, and the other is a lubricating oil chamber. A vent is provided between the isobaric buffer chamber and the lubricating oil chamber. The isobaric buffer chamber is connected to a pressure balancing pipeline, and the lubricating oil chamber is connected to a lubricating oil pipeline. With the above structure, the isobaric buffer chamber and the lubricating oil chamber are separated, and the lubricating oil exists only in the lubricating oil chamber. The isobaric buffer chamber can prevent materials in the pressure vessel from entering the lubricating oil chamber due to sudden pressure changes, thus avoiding material from entering the lubricating oil.
[0008] Furthermore, a cooling medium circulation pipe is provided within the lubricating oil chamber, and the lubricating oil tank is equipped with a condensate inlet and a condensate outlet, respectively connected to both ends of the cooling medium circulation pipe. The condensate inlet and outlet allow the circulation pipe to be connected to a cooling medium circulation system, cooling the lubricating oil entering the lubricating oil chamber. Simultaneously, the temperature difference between the lubricating oil and the cooling medium creates a thermosiphon effect, driving the lubricating oil to circulate naturally. Alternatively, a circulation pump can be installed on the lubricating oil pipeline to achieve lubricating oil circulation, with the cooling medium flowing through the circulation pipe to cool the lubricating oil.
[0009] Furthermore, the lubricating oil chamber is equipped with a guide plate that rises upward in the middle. The guide plate is located above the cooling medium flow pipe and below the filler port on the lubricating oil tank. When the lubricating oil flows back into the lubricating oil chamber, it can flow downward along the guide plate, while preventing the lubricating oil below from splashing upward.
[0010] Furthermore, the side wall of the lubricating oil tank is provided with a pressure balancing interface for connecting to the pressure balancing pipeline. The pressure balancing interface is connected to the isobaric buffer chamber and is lower than the vent. The pressure balancing interface facilitates connection to the pressure balancing pipeline; since the pressure balancing interface is lower than the vent, even if material enters the isobaric buffer chamber, it will not enter the lubricating oil chamber through the vent, thus achieving effective isolation between the material and the lubricating oil.
[0011] Furthermore, the side wall of the lubricating oil tank is provided with an oil return port and an oil supply port spaced vertically. Both the oil return port and the oil supply port are connected to the lubricating oil chamber and are used to connect the oil return end and the oil supply end of the lubricating oil pipeline, respectively. The oil return port and the oil supply port are spaced vertically, so that the lubricating oil flows into the lubricating oil chamber from the top and flows out of the lubricating oil chamber from the bottom, making the lubricating oil circulation smoother.
[0012] Furthermore, the bottom wall of the lubricating oil tank is provided with a drain port that connects to the isobaric buffer chamber, and the top and bottom walls of the lubricating oil tank are respectively provided with an oil filling port and an oil drain port that connect to the lubricating oil chamber. If material enters the isobaric buffer chamber, it can be discharged through the drain port, which facilitates the cleaning of the isobaric buffer chamber. The oil filling port and the oil drain port are used for adding oil and draining oil from the lubricating oil chamber, respectively.
[0013] Furthermore, the bearing housing is provided with an oil inlet and an oil outlet communicating with its internal cavity. The oil inlet is located below the oil outlet, and the oil inlet and oil outlet are used to connect to the oil inlet and oil outlet ends of the lubricating oil pipeline, respectively. The oil inlet and oil outlet are connected to the oil inlet and oil outlet ends of the lubricating oil pipeline, respectively. The lubricating oil flows into the bearing housing from below, and after flowing into the bearing housing, it can absorb the heat from the shaft end of the rotating shaft, and then flows out from the oil outlet. The oil inlet being located below the oil outlet makes the lubricating oil circulation smoother during the process.
[0014] Furthermore, the lubricating oil pipeline includes a first oil pipe and a second oil pipe. The first oil pipe has a return oil end and an outlet oil end, and the second oil pipe has a supply oil end and an inlet oil end. The inlet oil end and the outlet oil end are used to connect to the bearing chamber, and the supply oil end and the return oil end are used to connect to the lubricating oil tank. The first and second oil pipes establish a circulation of lubricating oil between the lubricating oil tank and the bearing chamber, preventing lubricating oil from accumulating in the bearing chamber and causing temperature rise and negative effects.
[0015] To achieve the above objectives, this utility model also discloses a low-temperature evaporation crystallization device, including a crystallization kettle. This device further includes the aforementioned shaft-end leak-proof structure, where the crystallization kettle is the pressure vessel. By employing the aforementioned shaft-end leak-proof structure, the low-temperature evaporation crystallization device prevents material leakage from the end of the rotating shaft at the end of the crystallization kettle, thereby improving the safety of the low-temperature evaporation crystallization device.
[0016] In summary, the beneficial effects of this utility model are as follows: This utility model provides a shaft end anti-leakage structure. By setting a pressure balancing pipeline between the lubricating oil tank and the pressure vessel, the lubricating oil entering the bearing chamber can effectively prevent harmful materials in the pressure vessel from leaking out from the shaft end while providing good lubrication to the bearing. When applied to low-temperature evaporation crystallization equipment, this shaft end anti-leakage structure can prevent harmful materials from leaking out from the end of the crystallization vessel, thus improving the operational safety of the low-temperature evaporation crystallization equipment. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model;
[0018] Figure 2 yes Figure 1 The diagram shown is a structural schematic of the pressure vessel after being cut open at the right end in the embodiment shown.
[0019] Figure 3 yes Figure 1 A schematic diagram of the lubricating oil tank in the embodiment shown;
[0020] Figure 4 yes Figure 3 The diagram shows the structure of the lubricating oil tank after it has been cut open.
[0021] Figure 5 yes Figure 1 The illustrated embodiment is a schematic diagram of the pipe connection structure.
[0022] In the diagram: 1. Pressure vessel, 2. Bearing chamber, 3. Shaft, 4. Connecting hole, 5. Sealing device, 6. Lubricating oil tank, 7. Lubricating oil pipeline, 8. Pressure balancing pipeline, 9. Isobaric buffer chamber, 10. Lubricating oil chamber, 11. Vent, 12. Cooling medium flow pipe, 13. Condensate inlet, 13-1. Oil supply interface, 14. Condensate outlet, 14-1. Oil return interface, 15. Guide plate, 16. Pressure balancing interface, 17. Oil filling port, 18. Oil drain port, 19. Drain port, 20. Oil inlet, 21. Oil outlet, 22. First oil pipe, 23. Second oil pipe, 24. Bearing. Detailed Implementation
[0023] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.
[0024] Reference Figure 1 , Figure 2 , Figure 5In some embodiments of this utility model, a shaft end anti-leakage structure includes a pressure vessel 1, a bearing chamber 2 at the end of the pressure vessel 1, a rotating shaft 3 inside the pressure vessel 1, a connecting hole 4 between the pressure vessel 1 and the bearing chamber 2, the end of the rotating shaft 3 extending into the bearing chamber 2 through the connecting hole 4, a bearing 24 for supporting the end of the rotating shaft 3 installed in the bearing chamber 2, and a sealing device 5 between the rotating shaft 3 and the connecting hole 4. The sealing device shown in the figure is a mechanical seal, but it can also be other types of sealing devices. The shaft end anti-leakage structure also includes a lubricating oil tank 6, a lubricating oil pipeline 7 connecting the lubricating oil tank 6 and the bearing chamber 2, and a pressure balancing pipeline 8 connecting the lubricating oil tank 6 and the pressure vessel 1. The pressure vessel 1 refers to a container with positive or negative pressure inside. With the above structure, the pressure balancing pipeline 8 connects the lubricating oil tank 6 to the pressure vessel 1, so that the pressure of the lubricating oil tank 6 and the pressure vessel 1 is balanced. Since there is a lubricating oil pipeline 7 between the lubricating oil tank 6 and the bearing chamber 2, the pressure of the lubricating oil tank 6 and the bearing chamber 2 is balanced, and finally the pressure of the bearing chamber 2 and the pressure vessel 1 is balanced. The lubricating oil in the lubricating oil tank 6 enters the bearing chamber 2 through the lubricating oil pipeline 7. The lubricating oil entering the bearing chamber 2 not only lubricates the bearing 24, but also seals the shaft end of the rotating shaft 3 under the pressure balancing effect, which can effectively prevent harmful materials in the pressure vessel 1 from leaking out from the shaft end of the rotating shaft 3.
[0025] Reference Figure 3 , Figure 4 In some embodiments of this utility model, the lubricating oil tank 6 has two chambers spaced apart on the left and right sides. One is an isobaric buffer chamber 9, and the other is a lubricating oil chamber 10. A vent 11 is provided between the isobaric buffer chamber 9 and the lubricating oil chamber 10. The isobaric buffer chamber 9 is connected to the pressure balance pipeline 8, and the lubricating oil chamber 10 is connected to the lubricating oil pipeline 7. In the illustrated embodiment, the lubricating oil tank 6 is provided with a vertical partition, which separates the lubricating oil tank 6 on the left and right sides to form the isobaric buffer chamber 9 and the lubricating oil chamber 10. A notch is provided at the upper end of the vertical partition, thereby forming the vent 11. With the above structure, the isobaric buffer chamber 9 and the lubricating oil chamber 10 are separated, and the lubricating oil exists only in the lubricating oil chamber 10. The isobaric buffer chamber 9 can prevent the material in the pressure vessel 1 from entering the lubricating oil chamber 10 due to sudden pressure changes, thus avoiding the material from entering the lubricating oil.
[0026] Reference Figure 3 , Figure 4In some embodiments of this utility model, a cooling medium flow pipe 12 is provided inside the lubricating oil chamber 10, and a condensing medium inlet 13 and a condensing medium outlet 14 are respectively connected to the two ends of the cooling medium flow pipe 12. The condensing medium inlet 13 and the condensing medium outlet 14 allow the medium flow pipe 12 to be connected to a cooling medium circulation system to cool the lubricating oil entering the lubricating oil chamber 10. Simultaneously, the temperature difference between the lubricating oil and the cooling medium creates a thermosiphon effect, driving the lubricating oil to circulate naturally. Alternatively, a circulation pump can be installed on the lubricating oil pipeline 7 to achieve the circulation of the lubricating oil, with the cooling medium flowing through the medium flow pipe 12 to cool the lubricating oil. A guide plate 15 with an upward-protruding center is provided inside the lubricating oil chamber 10. The guide plate 15 is located above the cooling medium flow pipe 12 and below the filler port 17 on the lubricating oil tank 6. When the lubricating oil flows back to the lubricating oil chamber 10, it can flow downwards along the guide plate 15, preventing the lubricating oil below from splashing upwards. The side wall of the lubricating oil tank 6 is provided with a pressure balance interface 16 for connecting to the pressure balance pipeline 8. The pressure balance interface 16 is connected to the isobaric buffer chamber 9 and is lower than the vent 11. The pressure balance interface 16 facilitates connection to the pressure balance pipeline 8. Since the pressure balance interface 16 is lower than the vent 11, even if material enters the isobaric buffer chamber 9, it will not enter the lubricating oil chamber 10 through the vent 11, thus achieving effective isolation between the material and the lubricating oil.
[0027] Reference Figure 3 , Figure 4 In some embodiments of this utility model, the side wall of the lubricating oil tank 6 is provided with an oil return port 14-1 and an oil supply port 13-1 spaced vertically. Both the oil return port 14-1 and the oil supply port 13-1 are connected to the lubricating oil cavity 10. The oil return port 14-1 and the oil supply port 13-1 are respectively used to connect the oil return end and the oil supply end of the lubricating oil pipeline 7. The oil return port 14-1 and the oil supply port 13-1 are spaced vertically, allowing lubricating oil to flow into the lubricating oil cavity 10 from the top and out from the bottom, making the lubricating oil circulation smoother. The bottom wall of the lubricating oil tank 6 is provided with a drain port 19 connected to the isobaric buffer chamber 9. The top and bottom walls of the lubricating oil tank 6 are respectively provided with an oil filling port 17 and an oil drain port 18 connected to the lubricating oil cavity 10. The drain port 19 can be connected to a drain pipe, and a valve can be installed on the drain pipe. If material enters the equal pressure buffer chamber 9, it can be discharged through the drain port 19, which facilitates the cleaning of the equal pressure buffer chamber 9. The oil filling port 17 and the oil drain port 18 are used for adding and draining oil from the lubricating oil tank 6, respectively. The oil filling port 17 and the oil drain port 18 are normally closed and opened when in use.
[0028] Reference Figure 2In some embodiments of this utility model, the bearing chamber 2 is provided with an oil inlet 20 and an oil outlet 21 communicating with its inner cavity. The oil inlet 20 is located below the oil outlet 21. The oil inlet 20 and the oil outlet 21 are respectively used to connect the oil inlet end and the oil outlet end of the lubricating oil pipeline 7. The oil inlet 20 and the oil outlet 21 are respectively connected to the oil inlet end and the oil outlet end of the lubricating oil pipeline 7. The lubricating oil flows into the bearing chamber 2 from below. After flowing into the bearing chamber 2, it can absorb the heat of the shaft end of the rotating shaft 3, and then flows out from the oil outlet 21. The oil inlet 20 is located below the oil outlet 21, which makes the lubricating oil circulation smoother.
[0029] Reference Figure 5 In some embodiments of this utility model, the lubricating oil pipeline 7 includes a first oil pipe 22 and a second oil pipe 23. The first oil pipe 22 has a return oil end and an outlet oil end, and the second oil pipe 23 has a supply oil end and an inlet oil end. The inlet oil end and the outlet oil end are used to connect to the bearing chamber 2, and the supply oil end and the return oil end are used to connect to the lubricating oil tank 6. The first oil pipe 22 and the second oil pipe 23 can establish a circulation of lubricating oil between the lubricating oil tank 6 and the bearing chamber 2, avoiding the accumulation of lubricating oil in the bearing chamber 2, which would cause the temperature to rise and have a negative impact.
[0030] This utility model also discloses a low-temperature evaporation crystallization device, including a crystallization kettle. The device further includes the aforementioned shaft-end leak-proof structure. The crystallization kettle is the pressure vessel 1, and preferably a horizontal crystallization kettle. By adopting the aforementioned shaft-end leak-proof structure, the low-temperature evaporation crystallization device prevents material leakage from the shaft end of the rotating shaft 3 at the end of the crystallization kettle, thus improving the safety of the device.
[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.
Claims
1. A shaft end anti-leakage structure, comprising a pressure vessel (1), a bearing chamber (2) at the end of the pressure vessel (1), a rotating shaft (3) inside the pressure vessel (1), a connecting hole (4) between the pressure vessel (1) and the bearing chamber (2), the end of the rotating shaft (3) extending through the connecting hole (4) into the bearing chamber (2), a bearing (24) for supporting the end of the rotating shaft (3) installed in the bearing chamber (2), and a sealing device (5) between the rotating shaft (3) and the connecting hole (4), characterized in that, The anti-leakage structure at the shaft end also includes a lubricating oil tank (6), a lubricating oil pipeline (7) connecting the lubricating oil tank (6) and the bearing chamber (2), and a pressure balance pipeline (8) connecting the lubricating oil tank (6) and the pressure vessel (1).
2. The shaft end anti-leakage structure as described in claim 1, characterized in that, The lubricating oil tank (6) has two chambers spaced apart on the left and right. One of them is an isobaric buffer chamber (9) and the other is a lubricating oil chamber (10). A vent (11) is provided between the isobaric buffer chamber (9) and the lubricating oil chamber (10). The isobaric buffer chamber (9) is connected to the pressure balance pipeline (8) and the lubricating oil chamber (10) is connected to the lubricating oil pipeline (7).
3. The shaft end anti-leakage structure as described in claim 2, characterized in that, The lubricating oil chamber (10) is provided with a cooling medium flow pipe (12), and the lubricating oil tank (6) is provided with a condensing medium inlet (13) and a condensing medium outlet (14) that are respectively connected to the two ends of the cooling medium flow pipe (12).
4. The shaft end anti-leakage structure as described in claim 3, characterized in that, The lubricating oil chamber (10) is provided with a guide plate (15) that is raised in the middle. The guide plate (15) is located above the cooling medium flow pipe (12) and below the oil filling port (17) on the lubricating oil tank (6).
5. The shaft end anti-leakage structure as described in claim 2, characterized in that, The side wall of the lubricating oil tank (6) is provided with a pressure balance interface (16) for connecting the pressure balance pipeline (8). The pressure balance interface (16) is connected to the equal pressure buffer chamber (9). The pressure balance interface (16) is lower than the vent (11).
6. The shaft end anti-leakage structure as described in claim 2, characterized in that, The side wall of the lubricating oil tank (6) is provided with an oil return port (14-1) and an oil supply port (13-1) spaced apart vertically. The oil return port (14-1) and the oil supply port (13-1) are both connected to the lubricating oil cavity (10). The oil return port (14-1) and the oil supply port (13-1) are respectively used to connect the oil return end and the oil supply end of the lubricating oil pipeline (7).
7. The shaft end anti-leakage structure as described in claim 2, characterized in that, The bottom wall of the lubricating oil tank (6) is provided with a drain port (19) that connects to the equal pressure buffer chamber (9), and the top and bottom walls of the lubricating oil tank (6) are respectively provided with an oil filling port (17) and an oil drain port (18) that connect to the lubricating oil chamber (10).
8. The shaft end anti-leakage structure as described in claim 1, characterized in that, The bearing chamber (2) is provided with an oil inlet (20) and an oil outlet (21) that connect to its inner cavity. The oil inlet (20) is located below the oil outlet (21). The oil inlet (20) and the oil outlet (21) are respectively used to connect the oil inlet end and the oil outlet end of the lubricating oil pipeline (7).
9. The shaft end anti-leakage structure as described in claim 1, characterized in that, The lubricating oil pipeline (7) includes a first oil pipe (22) and a second oil pipe (23). The first oil pipe (22) is provided with an oil return end and an oil outlet end, and the second oil pipe (23) is provided with an oil supply end and an oil inlet end. The oil inlet end and the oil outlet end are used to connect to the bearing chamber (2), and the oil supply end and the oil return end are used to connect to the lubricating oil tank (6).
10. A low-temperature evaporation crystallization apparatus, comprising a crystallization vessel, characterized in that, The low-temperature evaporation crystallization equipment also includes a shaft end anti-leakage structure as described in any one of claims 1 to 9, and the crystallization kettle is the pressure vessel (1).