A composite sealing structure for a high-temperature resistant direct-drive fan

Abstract

This utility model relates to the field of direct-drive fan technology, specifically a composite sealing structure for a high-temperature resistant direct-drive fan, comprising: a fan, the fan including a front cover and a back plate, an impeller mounted on the inner side of the back plate via a main shaft, a bushing assembly located in the middle of the back plate, the main shaft axially passing through the bushing assembly, and a sealing assembly between the main shaft and the bushing assembly. This utility model utilizes the bushing assembly to isolate the main shaft and the back plate, facilitating maintenance and replacement; by setting cooling oil channels on the bushing, and using radial and auxiliary oil channels to form a cooling oil circulation at the front, middle, and rear positions of the bearing, cooling the main shaft while simultaneously lubricating the bearing, improving the cooling effect, ensuring bearing lubrication, and extending service life; and using an oil seal to achieve end sealing, with the oil channels providing cooling and lubrication for the oil seal.

Description

Technical Field

[0001] This utility model relates to the field of direct-drive fan technology, specifically a composite sealing structure for a high-temperature resistant direct-drive fan. Background Technology

[0002] High-temperature direct-drive fans are a type of high-efficiency fan where the motor output shaft is directly connected to the fan impeller, eliminating the need for intermediate transmission devices such as belts or gears. These fans are widely used in high-temperature flue gas treatment systems in industries such as metallurgy, chemicals, and power generation, with operating temperatures typically between 200-400℃, and in some extreme conditions exceeding 500℃. In scenarios such as cement kiln tail gas treatment and blast furnace gas transportation in steel plants, the reliability of high-temperature direct-drive fans directly affects the continuous operation of the entire production line.

[0003] Existing sealing structures mainly employ three forms: labyrinth seals, packing seals, and mechanical seals. Labyrinth seals rely on complex gap structures to achieve sealing, but at high temperatures, metal parts are prone to thermal deformation, leading to increased gaps and a sharp decline in sealing effectiveness. Packing seals use high-temperature resistant materials such as graphite or ceramic fibers, but they suffer from high frictional resistance and require periodic tightening and adjustment, necessitating maintenance downtime on average every three months. While mechanical seals offer better performance, the difference in thermal expansion coefficients between the dynamic and static rings under high-temperature conditions can easily cause deformation of the sealing surface. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a composite sealing structure for a high-temperature resistant direct-drive fan.

[0005] The technical solution of this utility model is:

[0006] A composite sealing structure for a high-temperature resistant direct-drive fan, comprising:

[0007] A fan, comprising a front cover and a back plate, wherein an impeller is mounted on the inner side of the back plate via a main shaft, a bushing assembly is provided in the middle of the back plate, the main shaft passes axially through the bushing assembly, and a sealing assembly is provided between the main shaft and the bushing assembly;

[0008] The bushing assembly includes a bushing, the bushing having at least two cooling oil passages axially connected to the interior of the bushing for introducing cooling oil to cool the interior, and the main shaft being rotatably connected to the bushing via bearings.

[0009] The sealing assembly is used to seal the front and rear ends of the bushing to prevent cooling oil leakage.

[0010] Preferably, the bushing includes a bushing body, which is inserted from the outside of the back plate and fixedly connected to the back plate through an end face flange.

[0011] Preferably, the cooling oil passage includes an axially arranged main oil passage, a radial oil passage is provided in the middle of the main oil passage and located between the bearings, and auxiliary oil passages are provided at both ends of the main oil passage facing the center of the bushing body.

[0012] Preferably, the inner diameter of the main oil passage is larger than that of the radial oil passage, and the inner diameter of the radial oil passage is larger than that of the auxiliary oil passage.

[0013] Preferably, the outer opening of the radial oil passage is provided with a sealing plug, the end of the sealing plug is a conical surface, and the top of the sealing plug does not exceed the upper edge of the radial oil passage.

[0014] Preferably, the sealing assembly includes an oil seal, which is fixedly installed at both ends of the bushing body by an outer oil seal cover and an inner oil seal cover, and the auxiliary oil passage is located between the oil seal and the bearing.

[0015] Preferably, an oil injection pipe is provided through the outer oil seal cover, and the oil injection pipe is inserted into the main oil passage for connecting the main oil passage with the outside.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention utilizes a bushing assembly to isolate, maintain, and replace the spindle and back plate. By setting cooling oil channels on the bushing, and using radial and auxiliary oil channels to form a cooling oil circulation at the front, middle, and rear positions of the bearing, the spindle is cooled while the bearing is lubricated, improving the cooling effect, ensuring bearing lubrication, and extending service life. An oil seal is used to achieve end sealing, and the oil channels are used to cool and lubricate the oil seal. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is an exploded view of the wind turbine structure in this utility model;

[0020] Figure 3 This is a schematic cross-sectional view of the shaft sleeve assembly and sealing assembly of this utility model;

[0021] Figure 4 This is a first exploded view of the bushing assembly and sealing assembly of this utility model;

[0022] Figure 5 This is a second exploded view of the bushing assembly and sealing assembly of this utility model.

[0023] The meanings of the labels in the diagram are as follows:

[0024] 1. Fan; 11. Front cover; 12. Back plate; 13. Impeller; 14. Main shaft;

[0025] 2. Bushing assembly; 21. Bushing body; 22. End face flange; 23. First sealing gasket; 24. Main oil passage; 25. Radial oil passage; 26. Sealing plug; 27. Auxiliary oil passage; 28. Bearing;

[0026] 3. Sealing assembly; 31. Outer oil seal cover; 32. Inner oil seal cover; 33. Oil seal; 34. Oil injection pipe; 35. Second sealing gasket. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Example 1:

[0029] Please see Figure 1-5 The present invention will describe the above technical solution in detail through the following embodiments:

[0030] A composite sealing structure for a high-temperature resistant direct-drive fan, comprising:

[0031] Fan 1 includes a front cover 11 and a back plate 12. An impeller 13 is mounted on the inner side of the back plate 12 via a main shaft 14. A bushing assembly 2 is provided in the middle of the back plate 12. The main shaft 14 passes through the bushing assembly 2 axially. A sealing assembly 3 is provided between the main shaft 14 and the bushing assembly 2.

[0032] The fan 1 is designed to withstand high temperatures, and the main shaft 14 is directly connected to the power source, which is an electric motor.

[0033] The bushing assembly 2 includes a bushing, which has at least two cooling oil passages axially connected to the inside of the bushing for cooling oil to be introduced to cool the inside. The main shaft 14 is rotatably connected to the bushing via a bearing 28.

[0034] Bearing 28 is a ceramic hybrid bearing that needs to be able to withstand axial thrust. Steps need to be machined on the spindle 14 to limit the position of bearing 28.

[0035] The sealing assembly 3 is used to seal the front and rear ends of the bushing to prevent cooling oil leakage.

[0036] The bushing includes a bushing body 21, which is inserted from the outside of the back plate 12 and fixedly connected to the back plate 12 through the end face flange 22.

[0037] The bushing body 21 is cylindrical in shape, with a flange at one end. The end flange 22 and the flange of the bushing body 21 are fixedly connected by screws, which pass through the back plate 12.

[0038] The end flange 22 allows the bushing body 21 to extend and retract in the axial direction, thereby limiting the radial wobble of the bushing body 21.

[0039] A first sealing gasket 23 is provided between the end flange 22 and the back plate 12, and between the flange of the bushing body 21 and the back plate 12. The first sealing gasket 23 is made of a high-temperature resistant material and is used for sealing between the bushing assembly 2 and the back plate 12.

[0040] The cooling oil passage includes an axially arranged main oil passage 24, a radial oil passage 25 that runs through the middle of the main oil passage 24 and between the bearings 28, and auxiliary oil passages 27 that are provided at both ends of the main oil passage 24 toward the center of the bushing body 21.

[0041] In this embodiment, there are two main oil passages 24, which are symmetrically arranged. The upper main oil passage 24 is used to discharge cooling oil, and the lower main oil passage 24 is used to inject cooling oil. The cooling oil can be engine oil, which has both cooling and lubricating capabilities.

[0042] The inner diameter of the main oil passage 24 is larger than that of the radial oil passage 25, and the inner diameter of the radial oil passage 25 is larger than that of the auxiliary oil passage 27.

[0043] The radial oil passage 25 and the auxiliary oil passage 27 have different inner diameters to control the flow rate of cooling oil in different areas. The radial oil passage 25 has a larger flow rate.

[0044] A sealing plug 26 is provided at the outer opening of the radial oil passage 25. The end of the sealing plug 26 is a conical surface, and the top of the sealing plug 26 does not exceed the upper edge of the radial oil passage 25.

[0045] The sealing plug 26 is used to seal the outer opening of the radial oil passage 25. After removing the sealing plug 26, the radial oil passage 25 can be easily cleaned.

[0046] The sealing assembly 3 includes an oil seal 33, which is fixedly installed at both ends of the bushing body 21 by an outer oil seal cover 31 and an inner oil seal cover 32. An auxiliary oil passage 27 is located between the oil seal 33 and the bearing 28.

[0047] The auxiliary oil passage 27 is used to pass cooling oil between the oil seal 33 and the bearing 28 for cooling and lubrication of the oil seal 33.

[0048] Oil seal 33 is a metal oil seal used for dynamic sealing between spindle 14 and bushing assembly 2.

[0049] The outer oil seal cover 31 and the inner oil seal cover 32 are fixedly connected to the bushing body 21 by screws. A second sealing gasket 35 is provided between the outer oil seal cover 31 and the inner oil seal cover 32 and the bushing body 21. The second sealing gasket 35 is used to prevent the loss of cooling oil.

[0050] An oil injection pipe 34 is provided through the outer oil seal cover 31. The oil injection pipe 34 is inserted into the main oil passage 24 for connecting the main oil passage 24 with the outside.

[0051] In this embodiment, the oil supply for the bushing assembly 2 can be provided by a known oil supply device, including an oil tank and a circulation pump. The circulation pump can be a gear pump. The inlet of the circulation pump is connected to the oil tank, and the outlet is connected to the lower oil injection pipe 34 through a hose. The upper oil injection pipe 34 is connected to the oil tank through a hose. When the circulation pump is working, it can drive the cooling oil to circulate.

[0052] A cooling device, such as a combination of a water tank and a fan, can be added between the oil reservoir and the upper oil filling pipe 34 to cool the oil, thereby increasing the cooling effect of the oil on the bushing assembly 2 and the sealing assembly 3.

[0053] Working principle:

[0054] When the fan 1 is working, the impeller 13 and the main shaft 14 are subjected to high temperature, and the high temperature of the main shaft 14 is transmitted to the end.

[0055] At this time, cooling oil is injected into the lower oil injection pipe 34. The cooling oil enters the lower main oil passage 24 through the oil injection pipe 34, and then enters the bushing body 21 from the lower radial oil passage 25 and auxiliary oil passage 27 to cool the bearing 28 and oil seal 33. The cooling oil that has completed heat exchange enters the upper main oil passage 24 and then is discharged from the top.

[0056] The cooling oil can also lubricate the bearing 28 and the oil seal 33 while cooling the bearing 28 and the oil seal 33.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A composite sealing structure for a high-temperature resistant direct-drive fan, characterized in that, include: A fan (1) includes a front cover (11) and a back plate (12). An impeller (13) is mounted on the inner side of the back plate (12) via a main shaft (14). A bushing assembly (2) is provided in the middle of the back plate (12). The main shaft (14) passes through the bushing assembly (2) axially. A sealing assembly (3) is provided between the main shaft (14) and the bushing assembly (2). The bushing assembly (2) includes a bushing, the bushing being provided with at least two cooling oil passages in the axial direction, the cooling oil passages being connected to the inside of the bushing and used to introduce cooling oil to cool the inside, the main shaft (14) being rotatably connected to the bushing via a bearing (28); The sealing assembly (3) is used to seal the front and rear ends of the bushing to prevent cooling oil leakage.

2. The composite sealing structure for a high-temperature direct-drive fan as described in claim 1, characterized in that: The bushing includes a bushing body (21), which is inserted from the outside of the back plate (12) and fixedly connected to the back plate (12) through an end face flange (22).

3. The composite sealing structure for a high-temperature direct-drive fan as described in claim 2, characterized in that: The cooling oil passage includes an axially arranged main oil passage (24), a radial oil passage (25) is provided in the middle of the main oil passage (24) and between the bearings (28), and auxiliary oil passages (27) are provided at both ends of the main oil passage (24) facing the center of the bushing body (21).

4. The composite sealing structure for a high-temperature direct-drive fan as described in claim 3, characterized in that: The inner diameter of the main oil passage (24) is larger than that of the radial oil passage (25), and the inner diameter of the radial oil passage (25) is larger than that of the auxiliary oil passage (27).

5. The composite sealing structure for a high-temperature direct-drive fan as described in claim 3, characterized in that: The radial oil passage (25) has a sealing plug (26) at its outer opening. The end of the sealing plug (26) is a conical surface, and the top of the sealing plug (26) does not exceed the upper edge of the radial oil passage (25).

6. The composite sealing structure for a high-temperature direct-drive fan as described in claim 3, characterized in that: The sealing assembly (3) includes an oil seal (33), which is fixedly installed at both ends of the bushing body (21) by an outer oil seal cover (31) and an inner oil seal cover (32). The auxiliary oil passage (27) is located between the oil seal (33) and the bearing (28).

7. The composite sealing structure for a high-temperature direct-drive fan as described in claim 6, characterized in that: An oil injection pipe (34) is provided through the outer oil seal cover (31). The oil injection pipe (34) is inserted into the main oil passage (24) for communication between the main oil passage (24) and the outside.

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