Lubrication and sealing structure of intermediate bearing

Abstract

The present invention relates to a lubrication and sealing structure of an intermediate bearing, comprising an intermediate bearing, an inner shaft, an outer shaft and an oil collecting chamber, wherein the outer ring of the intermediate bearing is fixedly connected to the outer shaft, the inner ring of the intermediate bearing is fixedly connected to the inner shaft, a vacuum trap spiral sealing structure is arranged between the inner shaft and the outer shaft at the front side of the intermediate bearing, the vacuum trap spiral sealing structure is connected to the oil inlet hole of the inner shaft, an oil baffle plate is arranged at the rear side of the intermediate bearing, a small hole is arranged on the oil baffle plate, and an oil unloading hole connected to the oil collecting chamber is arranged on the inner hole of the outer shaft at the rear side of the intermediate bearing. The use of this structure can improve the lubrication problems encountered in the use of existing intermediate bearings and reduce the amount of lubricating oil used, so that the concentric shaft structure has a wider prospect of use.

Description

Technical Field

[0001] The invention relates to a lubrication structure of an intermediate bearing, in particular to a highly integrated lubrication structure of an intermediate bearing. Background Art

[0002] Intermediate bearings are commonly used supporting structures in concentric shaft structures. The inner ring and outer ring of the intermediate bearing rotate with the inner shaft and outer shaft respectively. The existence of intermediate bearings greatly increases the shaft stability of the concentric shaft structure and is an indispensable component in the use of concentric shaft structures.

[0003] Since the bearing seat of the intermediate bearing rotates with the high-speed rotor, the lubricating oil pipeline cannot be directly connected to the lubricating oil nozzle. Therefore, the intermediate bearing currently uses this kind of separated lubrication structure, such as Figure 1 As shown, during use, a certain portion of the fuel will splash out from the gap between the oil pipeline and the oil nozzle and directly flow into the oil drain chamber, resulting in a waste of oil.

[0004] In addition, the intermediate bearings often use a multi-channel expansion ring seal structure to prevent oil leakage and reduce lubricant consumption. The expansion ring seal is a type of contact seal. However, when the speed is too high or the oil temperature is high, the expansion ring may fail and lose its elasticity, thereby affecting the sealing effect.

[0005] Therefore, based on the above problems, it is necessary to propose a lubrication and sealing structure of an intermediate bearing. The use of this structure can make the lubrication oil path of the intermediate bearing smoother and the use of lubricating oil more efficient. At the same time, the lubricating oil can have a better lubricating oil sealing effect when the concentric shaft structure runs at high speed. Summary of the invention

[0006] The problem to be solved by the present invention is to propose a lubrication and sealing structure for an intermediate bearing, which can make the lubrication oil path of the intermediate bearing smoother and the use of lubricating oil more efficient; the use of a vacuum trap spiral seal can enable the intermediate bearing structure to obtain a better sealing effect at high speed.

[0007] To achieve the above-mentioned purpose, the technical solution of the present invention is: a lubrication and sealing structure of an intermediate bearing, comprising an intermediate bearing, an inner shaft, an outer shaft and an oil collecting chamber, the outer ring of the intermediate bearing is fixedly connected to the outer shaft, the inner ring of the intermediate bearing is fixedly connected to the inner shaft, a vacuum trap spiral sealing structure is arranged between the inner shaft and the outer shaft on the front side of the intermediate bearing, the vacuum trap spiral sealing structure is connected to the oil inlet hole of the inner shaft, an oil baffle plate is arranged on the rear side of the intermediate bearing, small holes are arranged on the oil baffle plate, and an oil unloading hole connected to the oil collecting chamber is arranged on the inner hole of the outer shaft on the rear side of the intermediate bearing.

[0008] Furthermore, the vacuum trap spiral sealing structure is composed of an outer shaft with an inner wall of an optical axis structure, two spiral lines with opposite rotation directions processed on the outer wall of the inner shaft, and a plurality of small holes arranged along the circumferential direction and connected to the oil inlet hole.

[0009] Furthermore, a low-pressure trap is generated in the center of the two spiral lines, and fluids on both sides cannot flow through the area.

[0010] Furthermore, the inner shaft has a central hole structure at the center of the intermediate bearing position.

[0011] The beneficial effects of the present invention are:

[0012] The intermediate bearing lubrication and sealing structure adopted in the present invention has the following characteristics:

[0013] 1. The existing intermediate bearing lubrication structure mostly adopts a separate nozzle structure, which will inevitably cause a part of the lubricating oil loss, making the lubricating oil system supply efficiency lower and the lubricating oil consumption increased. The use of this structure can effectively improve the use efficiency of the lubricating oil. The lubricating oil entering the intermediate bearing can play a lubricating and cooling effect.

[0014] 2. Although the expansion ring sealing technology currently used has the advantage of a smaller axial length, the metal expansion ring loses its elasticity under high-speed rotation and high temperature, which affects the sealing effect. The vacuum trap spiral seal used in this structure can effectively block the fluid on both sides of the seal, making the leakage of lubricating oil smaller. And the vacuum trap spiral seal has the characteristic that the faster the speed, the better the sealing effect. Its use is more applicable to the concentric shaft structure.

[0015] The use of this structure can improve the lubrication problem encountered in the use of existing intermediate bearings and reduce the amount of lubricating oil used, making the concentric shaft structure have a wider application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the lubrication and sealing structure of the existing intermediate bearing;

[0017] Figure 2 It is a schematic diagram of the lubrication and sealing structure of the intermediate bearing of the present invention;

[0018] Figure 3 It is a schematic diagram of the oil circuit lubrication direction of the intermediate bearing of the present invention. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] like Figure 2As shown, the lubrication and sealing structure of the intermediate bearing of the present invention can more efficiently utilize lubricating oil to lubricate the intermediate bearing and better seal the lubricated part at high speed.

[0021] The structure consists of an intermediate bearing 1, a vacuum trap spiral sealing structure 2, an oil baffle plate 3, an inner shaft 4, an outer shaft 5 and an oil collecting chamber 6. Figure 3 The flow direction of the oil circuit inside the intermediate bearing in this structure is shown in FIG.

[0022] The outer ring of the intermediate bearing 1 is fixedly connected to the outer shaft 5, and the inner ring of the intermediate bearing 1 is fixedly connected to the inner shaft 4. The front side of the intermediate bearing 1 is sealed by a vacuum trap spiral seal structure 2. The inner wall of the outer shaft 5 is a smooth axis structure, and two spiral lines with opposite rotation directions are processed on the outer wall of the inner shaft 4. A low-pressure area trap will be generated in the center of the two spiral lines, and the fluids on both sides cannot flow through this area.

[0023] The inner shaft 4 has a center hole structure at the center of the intermediate bearing position. It is supplied with oil through the oil inlet hole 7 on the right. After the lubricating oil flows in from the right, it flows to the left, and is thrown out from multiple small holes along the span direction between the intermediate bearing 1 and the vacuum trap spiral sealing structure 2 under the action of centrifugal force. Due to the existence of the vacuum trap spiral sealing structure 2, the lubricating oil can only fully lubricate the intermediate bearing 1 to the right and take away the heat generated by the intermediate bearing 1 during operation. Then it enters the area between the inner shaft 4 and the outer shaft 5 through the small hole reserved on the oil baffle plate 3. Then it enters the oil collecting chamber 6 along the oil unloading hole 8 again under the action of centrifugal force.

Claims

1. A lubrication and sealing structure for an intermediate bearing, comprising an intermediate bearing, an inner shaft, an outer shaft and an oil collecting chamber, characterized in that: The outer ring of the intermediate bearing is fixedly connected to the outer shaft, the inner ring of the intermediate bearing is fixedly connected to the inner shaft, a vacuum trap spiral sealing structure is arranged between the inner shaft and the outer shaft on the front side of the intermediate bearing, the vacuum trap spiral sealing structure is connected to the oil inlet hole of the inner shaft, an oil baffle plate is arranged on the rear side of the intermediate bearing, small holes are arranged on the oil baffle plate, and an oil unloading hole connected to the oil collecting chamber is arranged on the inner hole of the outer shaft on the rear side of the intermediate bearing.

2. The lubrication and sealing structure of the intermediate bearing according to claim 1, characterized in that: The vacuum trap spiral sealing structure is composed of an outer shaft with an inner wall of an optical axis structure, two spiral lines with opposite rotation directions processed on the outer wall of the inner shaft, and a plurality of small holes connected to the oil inlet holes arranged along the circumferential direction.

3. The lubrication and sealing structure of the intermediate bearing according to claim 2, characterized in that: A low-pressure trap is generated in the centers of the two spiral lines, and fluids on both sides cannot flow through the low-pressure trap.

4. The lubrication and sealing structure of the intermediate bearing according to claim 1, characterized in that: The inner shaft has a center hole structure at the center of the intermediate bearing position.

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