Inflatable carbon ring type oil seal structure for ventilator bearing box

Abstract

The utility model belongs to the technical field of bearing box oil seal structures, and particularly relates to an inflatable carbon ring type oil seal structure for a ventilator bearing box, which comprises a shell, a side cover, an oil retainer, an inflatable carbon ring type oil seal assembly, a vent hole, a bearing and a main shaft, the inflatable carbon ring type oil seal assembly comprises a shell, a shaft sleeve, an inflation hole and a carbon ring, the shaft sleeve is connected onto the main shaft, and the side cover is connected onto the shaft sleeve. The carbon ring is connected to the shaft sleeve, the outer shell is connected to the shaft sleeve, the inflation hole is formed in the outer shell, the ventilation hole is formed in the shell body, and an exhaust bolt is further arranged on the shell body and is in threaded transmission connection to the shell body. Compared with the prior art, the sealing device can replace an original structure of an aluminum labyrinth, a disc and a rope, nitrogen with certain pressure is filled, an air film exists in a gap between the carbon ring and the shaft sleeve, certain pressure difference can be formed when the nitrogen is filled all the time, lubricating oil on the surface of the shaft sleeve cannot flow out of a box body, sealing is formed, the service life is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bearing box oil seal structures, in particular to an inflatable carbon ring type oil seal structure for a ventilator bearing box. Background Technique

[0002] The bearing box is one of the core components for the normal operation of the ventilator, and its reliability is the key to ensuring the normal operation of the machine. In actual use, since the bearing box uses liquid lubricating oil as the lubricating medium, a reliable sealing device is required to ensure that the lubricating oil does not leak. Poor sealing of the bearing box will increase the maintenance cost, reduce the service life of the machine, and make the maintenance cycle more frequent. Secondly, the leaked lubricating oil will pollute the environment and make the environment where the equipment is located very dirty and messy. Generally, on-site users will pay attention to the cleanliness of the on-site use, and oil leakage will cause environmental pollution. Therefore, a reliable seal is very important. This patent provides a new type of oil seal structure, which can better solve the above problems. Content of the Utility Model

[0003] In view of the deficiencies of the prior art, the utility model develops an inflatable carbon ring type oil seal structure for a ventilator bearing box, which can replace the original aluminum labyrinth + packing rope structure. By filling nitrogen with a certain pressure, there is an air film between the gaps of the carbon ring and the shaft sleeve. Continuous inflation will form a certain pressure difference, so that the lubricating oil on the surface of the shaft sleeve cannot flow out of the box body, forming a seal, improving the service life of the seal and reducing the maintenance cost.

[0004] The technical solution for the utility model to solve the technical problem is: an inflatable carbon ring type oil seal structure for a ventilator bearing box, including a housing, a side cover, an oil retaining ring, an inflatable carbon ring type oil seal assembly, a ventilation hole, a bearing and a main shaft. The side cover is connected to the housing by bolts. The bearing is connected inside the housing. The main shaft is connected to the shaft sleeve. The oil retaining ring is connected to the main shaft. The inflatable carbon ring type oil seal assembly includes a housing, a shaft sleeve, an inflation hole and a carbon ring. The shaft sleeve is connected to the main shaft. The carbon ring is connected to the shaft sleeve. The housing is connected to the shaft sleeve. The inflation hole is arranged on the housing, and an inflation pipe is connected to the inflation hole. The ventilation hole is arranged on the housing, and an exhaust bolt is also arranged on the housing. The exhaust bolt is threadedly connected to the housing.

[0005] Preferably, at least 4 carbon rings are installed.

[0006] Preferably, the front end of the shaft sleeve is provided with a beak structure.

[0007] Preferably, 2-4 ventilation holes are arranged.

[0008] Preferably, the carbon ring adopts a split structure, the split part is connected by bolts, and a compensation spring is arranged on the outer side of the whole carbon ring.

[0009] Preferably, nitrogen gas is continuously filled into the inflation holes.

[0010] The effects provided in the utility model content are only the effects of the embodiments, rather than all the effects of the utility model. The above technical solutions have the following advantages or beneficial effects:

[0011] 1. By setting a carbon ring seal and arranging inflation holes on the outer shell, there is an air film between the gap of the carbon ring and the shaft sleeve. Continuous inflation will form a certain pressure difference, preventing the lubricating oil on the surface of the shaft sleeve from flowing out of the box body, forming a seal, and the structural design is simple;

[0012] 2. The carbon ring has a long service life, and there are no situations such as deformation and failure caused by wear of packing ropes and felt rings, etc., extending the service life of the seal, reducing the number of maintenance times, lowering the maintenance cost, and reducing the labor and material efforts;

[0013] 3. In the present utility model, nitrogen gas is filled into the inflation holes. The filled nitrogen gas has a lower temperature, and the internal and external gases of the box body circulate, which can reduce the temperature rise of the bearing and improve the bearing life; at the same time, filling nitrogen gas will reduce the oxygen and water vapor content in the gas inside the bearing box, reduce the corrosion of the bearing, etc., and improve the bearing life;

[0014] 4. The present utility model adopts an inflatable carbon ring type oil seal assembly, effectively reducing the occurrence of oil leakage, improving stability, saving maintenance costs, reducing the input of labor and materials, being more environmentally friendly with a long service life, extending the maintenance cycle, and reducing the workload of maintenance personnel;

[0015] 5. By designing the carbon ring into a split structure, it can be conveniently and quickly installed or removed. At the same time, a compensation spring is arranged on the outer ring of the carbon ring, which can play an automatic compensation role. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a partial sectional view of the front view of the present utility model;

[0017] Figure 2 It is a partial sectional view of the left view of the present utility model;

[0018] Figure 3 It is Figure 2 a partial enlarged view of area A in

[0019] Figure 4 It is Figure 2 a partial enlarged view of area B in

[0020] Figure 5 It is the overall structure diagram of the carbon ring.

[0021] Wherein: 1. Housing; 101. Exhaust bolt; 102. Side cover; 2. Oil retaining ring; 3. Outer shell; 4. Bush; 41. Snout structure; 5. Inflation hole; 51. Inflation pipe; 6. Carbon ring; 61. Compensation spring; 7. Ventilation hole; 8. Bearing; 9. Main shaft. Specific embodiments

[0022] In order to clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with its drawings.

[0023] Embodiment 1

[0024] See Figures 1 to 5 , an inflatable carbon ring type oil seal structure for a ventilator bearing box, including a housing 1, a side cover 102, an oil retaining ring 2, an inflatable carbon ring type oil seal assembly, a ventilation hole 7, a bearing 8 and a main shaft 9. The side cover 102 is connected to the housing 1 by bolts. The bearing 8 is connected inside the housing 1. The main shaft 9 is connected to the bush 4. The oil retaining ring 2 is connected to the main shaft 9. The inflatable carbon ring type oil seal assembly includes an outer shell 3, a bush 4, an inflation hole 5 and a carbon ring 6. The bush 4 is connected to the main shaft 9. The carbon ring 6 is connected to the bush 4. The outer shell 3 is connected to the bush 4. The inflation hole 5 is provided on the outer shell 3, and an inflation pipe 51 is connected to the inflation hole 5. The ventilation hole 7 is provided on the housing 1, and an exhaust bolt 101 is further provided on the housing 1. The exhaust bolt 101 is threadedly connected to the housing 1.

[0025] As Figure 1 and Figure 3 shown, at least 4 carbon rings 6 are installed.

[0026] As Figure 3 shown, a snout structure 41 is provided at the front end of the bush 4, which can receive the lubricating oil dripping when the oil retaining ring 2 is removed.

[0027] As Figure 2 and Figure 4 shown, 2 - 4 ventilation holes 7 are provided. The ventilation holes 7 are opened on the outer ring of the housing 1, which can make the gases on both sides of the bearing 8 inside the housing 1 communicate with each other and maintain air pressure balance.

[0028] As Figure 5 shown, the carbon ring 6 adopts a split structure, and the split part is connected by bolts. A compensation spring 61 is arranged on the overall outer side of the carbon ring 6, and the compensation spring 61 can play an automatic compensation role.

[0029] Nitrogen is continuously filled into the inflation hole 5.

[0030] Working principle

[0031] The utility model inflates the gap between the carbon ring 6 and the shaft sleeve 4 by arranging an inflation hole 5 on the outer shell 3 of the inflatable carbon ring type oil seal assembly, so as to form an air film in the gap and generate a certain pressure difference. The pressure difference is used to block the lubricating oil on the surface of the shaft sleeve 4 from flowing out of the box body, thereby realizing sealing. This sealing method has a simple structural design, does not rely on traditional easily worn sealing materials, the carbon ring 6 and the shaft sleeve 4 can be closely matched, and materials such as packing ropes and felt rings are not used, which can prevent deformation failure caused by wear and ensure the long-term stability of the seal; nitrogen with a lower temperature is filled into the inflation hole 5. On the one hand, nitrogen circulates inside and outside the box body, which can take away the heat generated by the operation of the bearing 8, reduce the temperature rise of the bearing 8, and improve the service life of the bearing 8. On the other hand, filling nitrogen can reduce the oxygen and water vapor content of the gas inside the bearing 8 box, reduce the corrosion of metal parts such as the bearing 8, and further ensure the normal operation of the bearing 8 and extend its service life; 2-4 ventilation holes 7 are opened on the outer ring of the housing 1 to make the gases on both sides of the bearing 8 inside the housing 1 communicate with each other and maintain air pressure balance, which helps to ensure that the bearing 8 works in a stable air pressure environment and reduce the possible decline in sealing performance or other adverse effects caused by air pressure imbalance.

[0032] Although the specific implementation manners of the present utility model are described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present utility model. Based on the technical solutions of the present utility model, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present utility model.

Claims

1. An inflatable carbon ring oil seal structure for a fan bearing box, characterized in that: The invention comprises a housing (1), a side cover (102), an oil retaining ring (2), an air-filled carbon ring oil seal assembly, an air vent (7), a bearing (8) and a main shaft (9), wherein the side cover (102) is connected to the housing (1) by bolts, the bearing (8) is connected to the inside of the housing (1), the main shaft (9) is connected to the shaft sleeve (4), the oil retaining ring (2) is connected to the main shaft (9), and the air-filled carbon ring oil seal assembly comprises a housing (3), a shaft sleeve (4), an air vent (5) and a carbon ring (6), the shaft sleeve (4) being connected to the main shaft (9), the carbon ring (6) being connected to the shaft sleeve (4), the housing (3) being connected to the shaft sleeve (4), the inflation hole (5) being arranged on the housing (3), the inflation hole (5) being connected to an inflation tube (51), the vent hole (7) being arranged on the housing (1), the housing (1) being further provided with an exhaust bolt (101), the exhaust bolt (101) being threadedly connected to the housing (1).

2. The inflatable carbon ring oil seal structure for a fan bearing box according to claim 1, characterized in that: The carbon ring (6) is installed with at least four rings.

3. The inflatable carbon ring oil seal structure for a fan bearing box according to claim 1, characterized in that: The front end of the shaft sleeve (4) is provided with a tip structure (41).

4. The inflatable carbon ring oil seal structure for a fan bearing box according to claim 1, characterized in that: The number of the vent holes (7) is 2-4.

5. The inflatable carbon ring oil seal structure for a fan bearing box according to claim 1, characterized in that: The carbon ring (6) adopts a split structure, the split parts are connected by bolts, and a compensation spring (61) is provided on the outer side of the entire carbon ring (6).

6. The inflatable carbon ring oil seal structure for a fan bearing box according to claim 1, characterized in that: The filling hole (5) is filled with nitrogen.

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