A sealing device with lubricating oil backflow insulation structure for high-temperature and high-pressure fan

Abstract

This invention provides a sealing device for high-temperature and high-pressure blowers with a lubricating oil reflux and heat insulation structure. It includes an oil tank, a sealing assembly, and an impeller shaft. The sealing assembly is sealed and fixedly connected to the outer sidewall of the oil tank. The impeller shaft is rotatably connected to both the sealing assembly and through holes on the sidewall of the oil tank. The impeller shaft is sealed to the sealing assembly, and a gap is provided between the outer circumference of the impeller shaft and the through holes on the sidewall of the oil tank. An oil reflux and heat insulation chamber is provided between the sealing assembly and the sidewall of the oil tank. An oil reflux hole is located at the bottom of the oil reflux and heat insulation chamber on the sidewall of the oil tank. The inner cavity of the oil tank communicates with the oil reflux and heat insulation chamber through the oil reflux hole. By providing an oil buffer chamber between the sealing assembly and the outer shell of the oil tank, the high-temperature and high-pressure lubricating oil flows out through the gap between the oil tank and the impeller shaft and enters the oil buffer chamber, preventing direct impact damage to the sealing assembly. This invention can be widely applied to oil sealing inside blowers.

Description

Technical Field

[0001] This utility model relates to a sealing device, and more particularly to a sealing device for a high-temperature and high-pressure fan with a lubricating oil return heat insulation structure. Background Technology

[0002] In most Roots blowers, a sealing assembly is usually installed on the outside of the oil tank to prevent the lubricating oil in the drive end oil tank from leaking out through the gap between the oil tank and the impeller shaft.

[0003] However, when the fan transports high-temperature and high-pressure gas for a long time, the temperature and pressure of the lubricating oil in the oil tank increase significantly. Since the sealing components are directly attached to the outer shell of the oil tank without an oil buffer area, the high-temperature and high-pressure lubricating oil in the oil tank flows out through the gap between the oil tank and the impeller shaft, directly causing impact damage to the sealing components and destroying the sealing performance of the sealing components. Ultimately, the lubricating oil leaks outward along the gap between the sealing components and the oil tank and impeller shaft. Utility Model Content

[0004] This utility model addresses the above-mentioned technical problems by providing a sealing device for high-temperature and high-pressure fans with a lubricating oil reflux heat insulation structure. Through this lubricating oil reflux heat insulation structure, an oil buffer chamber is set between the sealing component and the oil tank shell. After the high-temperature and high-pressure lubricating oil flows out through the gap between the oil tank and the impeller shaft, it enters the oil buffer chamber without directly causing impact damage to the sealing component, thus not compromising the sealing performance of the sealing component and extending the service life of the sealing component.

[0005] Therefore, the technical solution of this utility model is a sealing device for a high-temperature and high-pressure fan with a lubricating oil reflux heat insulation structure, including an oil tank, a sealing component, and an impeller shaft. The oil tank has an inner cavity, and the sealing component is located on the outside of the oil tank. The sealing component is sealed and fixedly connected to the side wall of the oil tank. The side wall of the oil tank has a through hole, and the impeller shaft passes through the through hole on the side wall of the oil tank and the interior of the sealing component. The impeller shaft is rotatably connected to the sealing component and the through hole on the side wall of the oil tank. The impeller shaft is sealed and connected to the sealing component, and there is a gap between the outer circumference of the impeller shaft and the through hole on the side wall of the oil tank.

[0006] An oil reflux heat insulation chamber is provided between the sealing assembly and the side wall of the oil tank. An oil reflux hole is provided on the side wall of the oil tank at the bottom of the oil reflux heat insulation chamber. The inner cavity of the oil tank and the oil reflux heat insulation chamber are connected through the oil reflux hole.

[0007] Preferably, the sealing assembly is a mechanical seal.

[0008] Preferably, the side wall of the oil tank is recessed into the interior of the oil tank at the outer circumference of the impeller shaft to form a U-shaped oil tank insulation section, and the oil return insulation cavity is located between the oil tank insulation section and the mechanical seal.

[0009] Preferably, the depth of the oil tank insulation section recessed into the oil tank is 34mm±2mm, the axial width of the oil return insulation cavity is 13mm±1mm, the diameter of the oil tank insulation section is 140mm±2mm, the shaft diameter of the impeller shaft is 28mm±1mm, and the diameter of the oil return hole is 6mm±1mm.

[0010] Preferably, the clearance between the outer circumference of the impeller shaft and the through hole on the side wall of the oil tank is 1mm ± 0.1mm.

[0011] Preferably, a coolant collection chamber is fixedly provided on the outer side of the bottom of the inner cavity of the oil tank, and the coolant collection chamber is opened and closed by a cover plate.

[0012] The beneficial effects of this utility model are:

[0013] 1. Since the sealing assembly is located on the outer circumference of the impeller shaft outside the oil tank, the impeller shaft and the sealing assembly rotate and seal against each other. At the same time, the sealing assembly is sealed and fixed to the outer shell of the oil tank, thereby achieving oil sealing between the sealing assembly and the oil tank and the impeller shaft respectively.

[0014] After the sealing assembly is sealed and fixed to the outer shell of the oil tank, an oil return heat insulation chamber is provided between the sealing assembly and the oil tank. An oil return hole is provided on the outer side wall of the oil tank at the bottom of the oil return heat insulation chamber. The inner cavity of the oil tank is connected to the oil return heat insulation chamber through the oil return hole. The oil return heat insulation chamber separates the sealing assembly from the oil tank. When the blower transmits high-temperature and high-pressure gas for a long time, the temperature inside the oil tank will rise significantly, reaching about 100 degrees Celsius. At this time, the gas pressure inside the oil tank expands rapidly. Under the action of pressure, a small amount of lubricating oil splashed inside the oil tank and a small amount of oil mist generated will flow outward through the gap between the impeller shaft and the oil tank. Since there is an oil return heat insulation chamber between the impeller shaft, the oil tank, and the sealing assembly, the lubricating oil flowing outward will enter the oil return heat insulation chamber for temporary storage. At this time, the oil return heat insulation chamber plays a role in buffering and depressurizing the lubricating oil entering, so that the lubricating oil will not impact the sealing assembly, and thus the lubricating oil will not leak into the external environment.

[0015] When the blower is running at low speed or stopped, as the temperature inside the oil tank decreases, a significant negative pressure is formed inside the oil tank. Under the action of negative pressure, the lubricating oil in the oil return insulation chamber will flow back into the oil tank through the oil return hole, further preventing the lubricating oil in the oil return insulation chamber from leaking into the external environment, and ultimately ensuring the stability of the blower when transmitting high-temperature and high-pressure gas.

[0016] 2. Because the outer sidewall of the oil tank bends inward at the outer circumference of the impeller shaft, forming a U-shaped heat insulation section, the oil return heat insulation cavity is located between the heat insulation section and the mechanical seal. The U-shaped heat insulation section can achieve a wrapping fixation of the mechanical seal, increasing the stability of the mechanical seal when the impeller shaft rotates at high speed, preventing the mechanical seal from shaking, and ensuring the sealing performance of the mechanical seal. Furthermore, the U-shaped heat insulation section can increase the structural strength and stability of the oil tank, ensuring a stable sealing effect between the heat insulation section and the mechanical seal. At the same time, the U-shaped heat insulation section can reduce the contact area between the mechanical seal and the oil tank, thereby reducing heat transfer between the two and preventing the mechanical seal from overheating and compromising its sealing performance.

[0017] 3. A coolant collection chamber is fixedly installed on the outer side of the bottom of the oil tank cavity. The coolant collection chamber is opened and closed by a cover plate. The coolant collection chamber is used to hold coolant. Since the lubricating oil in the oil tank mainly accumulates at the bottom of the oil tank cavity, the coolant collection chamber mainly cools the lubricating oil at the bottom of the oil tank cavity. Its main function is to ensure that the lubricating oil in the oil tank is kept at a low temperature. The low temperature lubricating oil can further improve the cooling efficiency of the relevant components inside the blower. During the low temperature lubricating oil circulation cooling process, it can quickly remove the heat from the relevant components, thereby extending the service life of the relevant components. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the structure of this utility model;

[0019] Figure 2 This is a utility model Figure 1 Enlarged view of point A in the middle.

[0020] Explanation of symbols in the diagram:

[0021] 1. Oil tank; 101. Oil tank insulation section; 2. Sealing assembly; 3. Impeller shaft; 4. Sealing ring; 5. Oil return insulation chamber; 6. Oil tank inner cavity; 7. Coolant collection chamber; 8. Cover plate; 9. Oil return hole; 10. Through hole. Detailed Implementation

[0022] The present invention will be further described below with reference to the embodiments.

[0023] pass Figures 1-2As can be seen, the sealing device for high-temperature and high-pressure fans with a lubricating oil reflux heat insulation structure includes an oil tank 1, a sealing component 2, and an impeller shaft 3. The oil tank 1 has an inner cavity 6. The sealing component 2 is located on the outside of the oil tank 1 and is sealed and fixedly connected to the side wall of the oil tank 1. The side wall of the oil tank 1 has a through hole 10. The impeller shaft 3 passes through the through hole 10 on the side wall of the oil tank 1 and the interior of the sealing component 2. The impeller shaft 3 is rotatably connected to the sealing component 2 and the through hole 10 on the side wall of the oil tank 1. The impeller shaft 3 is sealed to the sealing component 2, thereby achieving oil sealing between the sealing component 2 and the oil tank 1 and the impeller shaft 3.

[0024] A gap is provided between the outer circumference of the impeller shaft 3 and the through hole 10 on the side wall of the oil tank 1.

[0025] An oil reflux heat insulation chamber 5 is provided between the sealing assembly 2 and the side wall of the oil tank 1. An oil reflux hole 9 is provided on the side wall of the oil tank 1 at the bottom of the oil reflux heat insulation chamber 5. The inner cavity 6 of the oil tank and the oil reflux heat insulation chamber 5 are connected through the oil reflux hole 9.

[0026] The oil return heat insulation chamber 5 separates the sealing component 2 from the oil tank 1. When the blower transmits high-temperature and high-pressure gas for a long time, the temperature inside the oil tank 1 will rise significantly, reaching about 80 degrees Celsius. At this time, the gas pressure inside the oil tank 1 expands rapidly. Under the action of pressure, a small amount of lubricating oil splashed inside the oil tank 1 and a small amount of oil mist generated will flow outward through the gap between the impeller shaft 3 and the oil tank 1. Since the oil return heat insulation chamber 5 is provided between the impeller shaft 3, the oil tank 1, and the sealing component 2, the lubricating oil flowing outward will enter the oil return heat insulation chamber 5 for temporary storage. At this time, the oil return heat insulation chamber 5 plays a role in buffering and depressurizing the lubricating oil entering, so that the lubricating oil will not impact the sealing component 2, and thus the lubricating oil will not leak into the external environment.

[0027] When the blower is running at low speed or stopped, as the temperature inside the oil tank 1 decreases, a significant negative pressure is formed inside the oil tank 1. Under the action of the negative pressure, the lubricating oil in the oil return insulation chamber 5 will flow back into the oil tank 1 through the oil return hole 9, further preventing the lubricating oil in the oil return insulation chamber 5 from leaking into the external environment, and ultimately ensuring the stability of the blower when transmitting high temperature and high pressure gas.

[0028] Without the oil return heat insulation chamber 5, the leaked lubricating oil would directly impact the sealing component 2. Under prolonged impact, this would damage the sealing performance of the sealing component 2, ultimately causing the lubricating oil to leak into the external environment. Furthermore, by setting up the oil return heat insulation chamber 5, the contact area between the sealing component 2 and the oil tank 1 can be reduced, thereby reducing the heat transfer between the two and preventing the sealing component 2 from overheating and causing damage to the sealing performance.

[0029] In one specific embodiment, the sealing component 2 is a mechanical seal. Compared with ordinary seals (usually referring to packing seals or lip seals, etc.), mechanical seals have better sealing performance and longer service life, and are especially suitable for the operation of fans conveying high temperature and high pressure gases.

[0030] In one specific embodiment, the side wall of the oil tank 1 is recessed into the interior of the oil tank 1 at the outer circumference of the impeller shaft 3, forming a U-shaped oil tank insulation section 101. The oil return insulation cavity 5 is located between the oil tank insulation section 101 and the mechanical seal. The U-shaped oil tank insulation section 101 can achieve a wrapping fixation of the mechanical seal, increasing the stability of the mechanical seal when the impeller shaft 3 rotates at high speed, avoiding the mechanical seal from shaking, and ensuring the sealing performance of the mechanical seal. In addition, the U-shaped oil tank insulation section 101 can increase the structural strength and stability of the oil tank 1, ensuring a stable sealing effect between the oil tank insulation section 101 and the mechanical seal. At the same time, the U-shaped oil tank insulation section 101 can reduce the contact area between the mechanical seal and the oil tank 1, thereby reducing the heat transfer between the two and avoiding the mechanical seal from overheating and causing damage to the sealing performance.

[0031] In a specific embodiment, the depth of the recess of the oil tank insulation section 101 into the oil tank 1 is 34mm ± 2mm, the axial width of the oil return insulation cavity 5 is 13mm ± 1mm, the diameter of the oil tank insulation section 101 is 140mm ± 2mm, the shaft diameter of the impeller shaft 3 is 28mm ± 1mm, and the diameter of the oil return hole 9 is 6mm ± 1mm. These five dimensions are related and form a synergistic effect. The proportional relationship between these five dimensions is the standard size ratio of commonly used high-temperature and high-pressure Roots blowers. It can achieve efficient return and insulation of lubricating oil in the oil tank, and can maximize the maintenance of the working temperature and working pressure of the lubricating oil, avoiding lubricating oil leakage. When producing blowers of other specifications, it is also necessary to process and assemble them according to this ratio to ensure the operating performance of the blower and avoid the problem of lubricating oil leakage under high temperature and high pressure.

[0032] In one specific embodiment, the gap between the outer circumference of the impeller shaft 3 and the through hole 10 on the side wall of the oil tank 1 is 1mm ± 0.1mm. This gap size is the optimal gap size between the oil tank and the impeller shaft. This size ensures that the impeller shaft 3 can rotate normally and will not rub against the oil tank 1, while minimizing the amount of oil mist in the oil tank 1 entering the oil return heat insulation cavity 5, thereby reducing the amount of lubricating oil accumulated at the bottom of the oil return heat insulation cavity 5 and further protecting the sealing performance of the mechanical seal.

[0033] In one specific embodiment, a coolant receiving chamber 7 is fixedly provided on the outer side of the bottom of the inner cavity 6 of the oil tank 1. The coolant receiving chamber 7 is opened and closed by a cover plate 8. The coolant receiving chamber 7 is used to contain coolant. Since the lubricating oil in the oil tank 1 mainly accumulates at the bottom of the inner cavity 6 of the oil tank, the coolant receiving chamber 7 is mainly used to cool the lubricating oil at the bottom of the inner cavity 6 of the oil tank. Its main function is to ensure that the lubricating oil in the oil tank 1 is kept at a low temperature. The low temperature lubricating oil can further improve the cooling efficiency of the relevant components inside the blower. During the low temperature lubricating oil circulation cooling process, it can quickly remove the temperature from the relevant components, thereby extending the service life of the relevant components.

[0034] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A sealing device for a high-temperature, high-pressure fan with a lubricating oil reflux and heat insulation structure, characterized in that: The system includes an oil tank, a sealing assembly, and an impeller shaft. The oil tank has an internal cavity, and the sealing assembly is located on the outside of the oil tank. The sealing assembly is sealed and fixedly connected to the side wall of the oil tank. The side wall of the oil tank has a through hole. The impeller shaft passes through the through hole in the side wall of the oil tank and the interior of the sealing assembly. The impeller shaft is rotatably connected to the sealing assembly and the through hole in the side wall of the oil tank. The impeller shaft is sealed and connected to the sealing assembly. There is a gap between the outer circumference of the impeller shaft and the through hole in the side wall of the oil tank. An oil reflux heat insulation chamber is provided between the sealing assembly and the side wall of the oil tank. An oil reflux hole is provided on the side wall of the oil tank at the bottom of the oil reflux heat insulation chamber. The inner cavity of the oil tank is connected to the oil reflux heat insulation chamber through the oil reflux hole.

2. The sealing device for high-temperature and high-pressure fans with a lubricating oil return heat insulation structure according to claim 1, characterized in that: The sealing assembly is a mechanical seal.

3. The sealing device for high-temperature and high-pressure fans with a lubricating oil return heat insulation structure according to claim 2, characterized in that: The side wall of the oil tank is recessed into the interior of the oil tank at the outer circumference of the impeller shaft, forming a U-shaped oil tank insulation section. The oil return insulation cavity is located between the oil tank insulation section and the mechanical seal.

4. The sealing device for high-temperature and high-pressure fans with a lubricating oil return heat insulation structure according to claim 3, characterized in that: The depth of the oil tank insulation section recessed into the oil tank is 34mm±2mm, the axial width of the oil return insulation cavity is 13mm±1mm, the diameter of the oil tank insulation section is 140mm±2mm, the shaft diameter of the impeller shaft is 28mm±1mm, and the diameter of the oil return hole is 6mm±1mm.

5. The sealing device for high-temperature and high-pressure fans with a lubricating oil return heat insulation structure according to claim 3, characterized in that: The clearance between the outer circumference of the impeller shaft and the through hole on the side wall of the oil tank is 1mm ± 0.1mm.

6. The sealing device for high-temperature and high-pressure fans with a lubricating oil return heat insulation structure according to claim 1, characterized in that: A coolant collection chamber is fixedly provided on the outer side of the bottom of the inner cavity of the oil tank. The coolant collection chamber is opened and closed by a cover plate.

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