Split type cylindrical bearing box group of axial flow fan

Abstract

A split type cylindrical bearing box set of an axial flow fan is composed of a round nut (1), an impeller (2), a main shaft (3), a front cylindrical roller bearing (4), a fixed end bearing shell (5), an angular contact bearing (6), a bearing box barrel (7), a rear cylindrical roller bearing (8), a floating end bearing shell (9), a rear shaft sleeve (10), a spring ferrule (14), a bearing clamping spring (12), a framework oil seal (11), a bearing box supporting frame (16), a front shaft sleeve (17) and a pre-tightening spring (13). The split type cylindrical bearing box set is long in service life, good in sealing effect and convenient to overhaul.

Description

Technical Field

[0001] The utility model relates to the technical field of axial flow fans with adjustable moving blades, and is suitable for induced draft fans of coal-fired boilers in large power stations and axial flow fan equipment for pressurizing flue gas in desulfurization and denitration systems. Background Art

[0002] At present, the induced draft fans configured in coal-fired boiler units in large power plants and in flue gas desulfurization and denitrification systems in metallurgical sintering mainly use axial flow fans with adjustable moving blades.

[0003] After years of practical operation and technical improvement, the current adjustable blade axial flow fan can basically meet the requirements of FGD booster fan in terms of fan structure, flue gas adaptability and performance. However, there are still great problems with the domestic adjustable blade axial flow fan device. The main problem is that when the pressure is high and the air volume is large, the fan selection must use an impeller with a wide blade chord and a relatively large hub. The impeller is very heavy, and there are many problems with the bearing box using the existing technology: 1. The fan bearing box has poor load-bearing capacity and a short bearing life; 2. The front and rear end covers of the bearing box leak oil; 3. When the bearing box is overhauled, the impeller and the main shaft are not easy to disassemble. Utility Model Content

[0004] The utility model aims to overcome the above technical defects and provide an axial flow fan split cylindrical bearing box group which has long bearing service life, good sealing effect and convenient maintenance.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the utility model is: composed of a round nut (1), an impeller (2), a main shaft (3), a front cylindrical roller bearing (4), a fixed end bearing shell (5), an angular contact bearing (6), a bearing box cylinder (7), a rear cylindrical roller bearing (8), a floating end bearing shell (9), a rear shaft sleeve (10), a spring ring (14), a bearing retaining ring (12), a skeleton oil seal (11), a bearing box support frame (16), a front shaft sleeve (17), and a preload spring (13); characterized in that the front cylindrical roller bearing (4) and two angular contact bearings (6) are sleeved on the left end of the main shaft (3), and a spring ring (14) is provided between the front cylindrical roller bearing (4) and the angular contact bearing (6). Four preload springs (13) are evenly distributed around the circumference and are compressed by a front sleeve (17); a rear cylindrical roller bearing (8) is sleeved on the right end of the main shaft (3), compressed by a rear sleeve (10), and installed as a whole in a fixed end bearing shell (5), a floating end bearing shell (9) and a bearing box cylinder (7); an outer ring of the rear cylindrical roller bearing (8) is fixed in the floating end bearing shell (9) by a bearing retaining ring (12), and skeleton oil seals (11) are installed at both ends to seal the entire transmission part; the fixed end bearing shell (5) and the floating end bearing shell (9) are installed on a bearing box support frame (16) by bolts (15); an impeller (2) is installed on the main shaft (3), and a round nut (1) is tightened at the front end to press the impeller (2).

[0006] Due to the adoption of the above technical solution, the utility model greatly extends the bearing replacement cycle for the large and heavy axial flow fan impeller during use. At the same time, it is more simple and convenient to disassemble during on-site maintenance, without oil leakage, and has very good use effects. Description of the Drawings

[0007] Figure 1 It is a schematic structural diagram of a split cylindrical bearing box group of an axial flow fan of the utility model;

[0008] In the figure: 1, round nut; 2, impeller; 3, main shaft; 4, front cylindrical roller bearing; 5, fixed end bearing housing; 6, angular contact bearing; 7, bearing box cylinder; 8, rear cylindrical roller bearing; 9, floating end bearing housing; 10, rear shaft sleeve; 11, skeleton oil seal; 12, bearing circlip; 13, preloading spring; 14, spring collar; 15, bolt; 16, bearing box support frame; 17, front shaft sleeve. Detailed Embodiments

[0009] The following further describes the utility model in conjunction with the drawings, which is not a limitation of its protection scope.

[0010] An axial flow fan split cylindrical bearing housing group is composed of a round nut (1), an impeller (2), a main shaft (3), a front cylindrical roller bearing (4), a fixed end bearing housing (5), an angular contact bearing (6), a bearing housing cylinder (7), a rear cylindrical roller bearing (8), a floating end bearing housing (9), a rear shaft sleeve (10), a spring collar (14), a bearing circlip (12), a skeleton oil seal (11), a bearing housing support frame (16), a front shaft sleeve (17), and a preloading spring (13); characterized in that the front cylindrical roller bearing (4) and two angular contact bearings (6) are sleeved on the left end of the main shaft (3), and four preloading springs (13) evenly distributed in the circumferential direction are arranged between the front cylindrical roller bearing (4) and the angular contact bearing (6) through the spring collar (14), and then pressed by the front shaft sleeve (17); the rear cylindrical roller bearing (8) is sleeved on the right end of the main shaft (3), pressed by the rear shaft sleeve (10), and integrally installed in the fixed end bearing housing (5), the floating end bearing housing (9), and the bearing housing cylinder (7). The outer ring of the rear cylindrical roller bearing (8) is fixed in the floating end bearing housing (9) through the bearing circlip (12), and skeleton oil seals (11) are installed at both ends to seal the entire transmission part; the fixed end bearing housing (5) and the floating end bearing housing (9) are installed on the bearing housing support frame (16) through bolts (15); the impeller (2) is installed on the main shaft (3), and the front end is tightened by the round nut (1) to press the impeller (2). The fixed end bearing housing (5), the floating end bearing housing (9), and the bearing housing cylinder (7) adopt a combined assembly structure, which is simpler to disassemble during on-site maintenance and convenient for processing and manufacturing. The two angular contact bearings (6) adopt a structure pressed by the preloading spring (13), which improves the axial load-bearing capacity of the bearing housing under high pressure. At the same time, the front cylindrical roller bearing (4) and the rear cylindrical roller bearing (8) are adopted, and their vertical gravity load-bearing capacity is greatly improved. It is applied to the transmission of heavy impellers with a very wide blade chord length and a large hub ratio, greatly improving the service life of the bearing; skeleton oil seals (11) are installed at both ends to seal the entire transmission part, avoiding the leakage of lubricating oil.

[0011] Therefore, the present utility model is a split cylindrical bearing housing group with a long service life, good sealing effect, and convenient maintenance.

Claims

1. A split cylindrical bearing box group for an axial flow fan, which is composed of a round nut (1), an impeller (2), a main shaft (3), a front cylindrical roller bearing (4), a fixed-end bearing housing (5), an angular contact bearing (6), a bearing box cylinder (7), a rear cylindrical roller bearing (8), a floating-end bearing housing (9), a rear shaft sleeve (10), a spring collar (14), a bearing circlip (12), a skeleton oil seal (11), a bearing box support frame (16), a front shaft sleeve (17), and a preloading spring (13); characterized in that The front cylindrical roller bearing (4) and two angular contact bearings (6) are sleeved on the left end of the main shaft (3). Between the front cylindrical roller bearing (4) and the angular contact bearing (6), four preloading springs (13) evenly distributed in the circumferential direction are arranged on the spring collar (14), and then are pressed by the front shaft sleeve (17); the rear cylindrical roller bearing (8) is sleeved on the right end of the main shaft (3) and is pressed by the rear shaft sleeve (10). The whole is installed in the fixed-end bearing housing (5), floating-end bearing housing (9) and bearing box cylinder body (7). The outer ring of the rear cylindrical roller bearing (8) is fixed in the floating-end bearing housing (9) by a bearing circlip (12), and skeleton oil seals (11) are installed at both ends to seal the whole transmission part; the fixed-end bearing housing (5) and the floating-end bearing housing (9) are installed on the bearing box support frame (16) by bolts (15); the impeller (2) is installed on the main shaft (3), and the front end is tightened and pressed against the impeller (2) by a round nut (1).

2. The split cylindrical bearing box group of an axial flow fan according to claim 1, characterized in that The fixed-end bearing housing (5), floating-end bearing housing (9) and bearing box cylinder body (7) adopt a combined assembly structure.

Images