Large fan shaft end sealing device

Abstract

The utility model discloses a large fan shaft end sealing device which comprises a floating sealing ring, a sealing packing, a spacer ring, a sealing pressing ring and a fixing ring, a groove is formed in the inner side of the floating sealing ring, the sealing packing is arranged in the groove, the floating sealing ring is fixedly connected with the sealing pressing ring through a bolt, and the edge of the floating sealing ring is connected with the fixing ring through a pin. The fixing ring is fixedly connected with the spacer ring through a bolt; and the sealing pressing ring is used for extruding and fixing, so that the sealing ring is tightly attached to the shaft to achieve a sealing effect. After the shaft end floating seal is adopted, the influence of a bearing clearance, shaft deflection and thermal expansion on a sealing material when a fan is just started is reduced, the abrasion of a fan shaft and the sealing material is reduced, the shaft end floating seal device and the fan shaft are always kept to run in a minimum sealing clearance, the problems of abrasion, aging, sealing failure and the like of the sealing material are solved, and the service life of the fan is prolonged. The air leakage amount of the shaft end is reduced to the maximum extent, and the operation efficiency of the fan is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of shaft sealing, in particular to a shaft end sealing device for a large fan. Background Art

[0002] When the fan is used under positive pressure, there is positive pressure inside the casing and the shaft seal is blowing outward. If the shaft seal is not sealed, air leakage will occur, resulting in power waste. The fan shaft end seal generally uses asbestos board and fixed packing sealing device. This sealing device has the following design defects. When the fan is started, due to the influence of bearing clearance, fan shaft deflection and thermal expansion, the asbestos board and packing will wear and age, the shaft end seal will fail, the service life will be short, and the air leakage will be serious.

[0003] The asbestos board sealing structure is unreasonable. Since the distance between the shell and the shaft is more than 50mm, the supporting capacity of the asbestos board is insufficient. The asbestos board is easy to wear when the fan is running, causing the gap between the shaft and the sealing asbestos board to gradually increase, and eventually the seal fails.

[0004] The fixed packing seal structure is unreasonable. When the fan is just started, it is affected by the bearing clearance, shaft deflection and thermal expansion, and the sealing packing is prone to aging and wear, resulting in failure of the shaft end seal. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and proposes a large fan shaft end sealing device.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A large fan shaft end sealing device comprises a floating sealing ring, a sealing packing, a spacer ring, a sealing pressure ring and a fixed ring. A groove is arranged on the inner side of the floating sealing ring, and a sealing packing is arranged in the groove. The floating sealing ring is fixedly connected to the sealing pressure ring by bolts, and the edge of the floating sealing ring is connected to the fixed ring by pins, and the fixed ring is fixedly connected to the spacer ring by bolts. The packing is installed in the sealing groove designed and processed at the inner diameter of the floating sealing ring, and is squeezed and fixed by the sealing pressure ring to make it fit tightly with the shaft to achieve a sealing effect.

[0008] A threaded hole D is provided on the inner edge of the floating sealing ring, and a threaded hole B is provided on the sealing pressure ring corresponding to the threaded hole D. The floating sealing ring and the sealing pressure ring are threadedly connected and fixed with the threaded hole D and the threaded hole B by bolts B.

[0009] A pin hole B is provided on the outer edge of the floating sealing ring, and a pin hole A is provided on the fixed ring corresponding to the pin hole B. The floating sealing ring and the fixed ring are connected and fixed by pins and pin holes A and B. When the fan is started, the floating sealing ring can float around the shaft to reduce the wear of the seal. A positioning pin is installed between the floating sealing ring and the fixed ring to facilitate the floating sealing ring to float with the shaft and prevent the floating seal from rotating with the shaft.

[0010] The outer edge of the fixing ring is provided with a screw hole A, and a threaded hole C is provided on the spacing ring corresponding to the screw hole A. The fixing ring and the spacing ring are threadedly connected and fixed with the bolt A through the threaded hole A and the threaded hole C.

[0011] The inner diameter of the sealing packing is smaller than the inner diameters of the floating sealing ring and the sealing pressure ring. The floating sealing ring, the sealing packing and the sealing pressure ring are all sleeved on the shaft. The inner diameter of the sealing packing is the same as the diameter of the shaft.

[0012] The spacer ring is fixed on the housing of the fan.

[0013] The beneficial effects of the utility model are as follows: after the shaft end floating seal is established, the influence of the bearing clearance, shaft deflection and thermal expansion on the sealing material when the fan is just started is reduced, the wear of the fan shaft and the sealing material is reduced, and the minimum sealing clearance is always maintained between the shaft end floating seal device and the fan shaft during operation, thus solving the problems of sealing material wear, aging, sealing failure, etc., the shaft end air leakage is reduced to the greatest extent, and the operating efficiency of the fan is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the utility model;

[0015] Figure 2 It is a cross-sectional view of the utility model;

[0016] Figure 3 This is a structural diagram of a fixed ring of the utility model;

[0017] Figure 4 This is a structural diagram of the pressing plate of the utility model;

[0018] Figure 5 This is a structural diagram of a floating seal ring of the utility model;

[0019] Figure 6 It is a partial structural diagram of the utility model;

[0020] In the figure: 1. shaft; 2. fixing ring; 21. pin; 22. bolt A; 23. threaded hole A; 24. pin hole A; 3. sealing pressure ring; 31. bolt B; 32. threaded hole B; 4. spacer ring; 41. threaded hole C; 5. floating sealing ring; 51. threaded hole D; 52. pin hole B; 53. groove; 6. sealing packing. DETAILED DESCRIPTION

[0021] Example 1

[0022] like Figure 1-6 As shown, the utility model provides a large-scale fan shaft end sealing device, which has the following structure: comprising a floating sealing ring 5, a sealing packing 6, a spacer ring 4, a sealing pressure ring 3 and a fixed ring 2, a groove 53 is arranged on the inner side of the floating sealing ring 5, a sealing packing 6 is arranged in the groove 53, the floating sealing ring 5 is fixedly connected with the sealing pressure ring 3 by bolts, the edge of the floating sealing ring 5 is connected with the fixed ring 2 by pins 21, and the fixed ring 2 is fixedly connected with the spacer ring 4 by bolts; the spacer ring 4 is fixed on the housing of the fan; the packing is installed in the sealing groove 53 designed and processed at the inner diameter of the floating sealing ring 5, and is squeezed and fixed by the sealing pressure ring 3, so that it fits tightly with the shaft to achieve a sealing effect;

[0023] A threaded hole D51 is provided on the inner edge of the floating sealing ring 5, and a threaded hole B32 is provided on the sealing pressure ring 3 corresponding to the threaded hole D51. The floating sealing ring 5 and the sealing pressure ring 3 are threadedly connected and fixed by bolts B31, threaded hole D51 and threaded hole B32; a pin hole B52 is provided on the outer edge of the floating sealing ring 5, and a pin hole A24 is provided on the fixing ring 2 corresponding to the pin hole B52. The floating sealing ring 5 and the fixing ring 2 are pin-connected and fixed by pins 21, pin holes A24 and pin holes B52; a screw hole A is provided on the outer edge of the fixing ring 2, and a threaded hole C41 is provided on the spacer ring 4 corresponding to the screw hole A. The fixing ring 2 and the spacer ring 4 are threadedly connected and fixed by bolts A22, threaded hole A23 and threaded hole C41;

[0024] The inner diameter of the sealing packing 6 is smaller than the inner diameters of the floating sealing ring 5 and the sealing pressure ring 3. The floating sealing ring 5, the sealing packing 6 and the sealing pressure ring 3 are all sleeved on the shaft 1. The inner diameter of the sealing packing 6 is the same as the diameter of the shaft 1.

[0025] When the fan starts, the floating seal ring 5 can float around the shaft 1 to reduce the wear of the seal. A positioning pin 21 is installed between the floating seal ring 5 and the fixed ring 2 to facilitate the floating seal ring 5 to float with the shaft and prevent the floating seal from rotating with the shaft.

Claims

1. A large fan shaft end sealing device, characterized in that: It includes a floating sealing ring, a sealing packing, a spacer ring, a sealing pressure ring and a fixed ring. A groove is arranged on the inner side of the floating sealing ring, and the sealing packing is arranged in the groove. The floating sealing ring is fixedly connected to the sealing pressure ring by bolts, the edge of the floating sealing ring is connected to the fixed ring by pins, and the fixed ring is fixedly connected to the spacer ring by bolts.

2. A large fan shaft end sealing device according to claim 1, characterized in that: A threaded hole D is provided on the inner edge of the floating sealing ring, and a threaded hole B is provided on the sealing pressure ring corresponding to the threaded hole D. The floating sealing ring and the sealing pressure ring are threadedly connected and fixed with the threaded hole D and the threaded hole B by bolts B.

3. A large fan shaft end sealing device according to claim 1, characterized in that: The outer edge of the floating sealing ring is provided with a pin hole B, and the fixed ring corresponding to the pin hole B is provided with a pin hole A. The floating sealing ring and the fixed ring are connected and fixed with the pin hole A and the pin hole B by a pin.

4. A large fan shaft end sealing device according to claim 1, characterized in that: The outer edge of the fixing ring is provided with a screw hole A, and a threaded hole C is provided on the spacing ring corresponding to the screw hole A. The fixing ring and the spacing ring are threadedly connected and fixed with the bolt A through the threaded hole A and the threaded hole C.

5. A large fan shaft end sealing device according to claim 1, characterized in that: The inner diameter of the sealing packing is smaller than the inner diameters of the floating sealing ring and the sealing pressure ring. The floating sealing ring, the sealing packing and the sealing pressure ring are all sleeved on the shaft. The inner diameter of the sealing packing is the same as the diameter of the shaft.

6. A large fan shaft end sealing device according to claim 1, characterized in that: The spacer ring is fixed on the housing of the fan.

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