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Air bearing based on sleeved bump foil

An air bearing and corrugated foil technology, which is applied in the field of air bearings based on socketed corrugated foils, can solve problems affecting the stability of gas compressors, uneven top waves, uneven gas films, etc., and achieves simple structure and space saving , Improve the effect of uniformity

Inactive Publication Date: 2022-08-09
YANTAI DONGDE IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical solutions disclosed in the above-mentioned patents all include a bottom plate, and the wave foil and the top foil are directly or indirectly connected to the bottom plate, and usually the bottom plate is fixed on the diffuser or the bearing seat by screws, which not only occupies a limited space, and under the action of long-term dynamic load, the screws will loosen and break, which will affect the stability of the entire system of the gas compressor
Moreover, the supporting corrugated foil is easily deformed due to welding, causing the corrugated foil to warp, resulting in uneven top waves and uneven air film during operation.

Method used

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  • Air bearing based on sleeved bump foil
  • Air bearing based on sleeved bump foil
  • Air bearing based on sleeved bump foil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1, as figure 1 The bearing seat 100 of the gas compressor shown has a shaft hole in the center, a concentric circular groove 101 is set on the end face of the diffuser or the bearing seat 100, and 6 groups are arranged on the circumference of the groove bottom of the circular groove 101, each group of 3, There are 18 round pin holes 102 in total, and the round pin holes 102 can be processed by drilling, and the processing technology is very simple. The circular groove 101 can be processed by turning or milling, and the processing technology is mature and convenient.

[0030] like image 3 As shown, 6 groups, 3 in each group, 18 cylindrical pins 2 in total and 6 groups, 3 in each group, 18 round pin holes 102 in total are interference fit; the top surface of the cylindrical pins 2 is higher than the diffuser The end face of the device or the bearing seat 100 is at least the thickness of the corrugated foil 1; the material of the cylindrical pin 2 is any suitabl...

Embodiment 2

[0035] Example 2, as Figure 6-8 As shown, the other is the same as in Embodiment 1, the difference is that the top foil 3 is a ring-shaped integrated structure, and the two adjacent top foil monomers 31 are connected together to form an annular shape by a corrugated tie 32; the corrugated tie 32 includes a The inner tether 321 of the loop and the outer tether 322 near the outer loop. The wave ties 32 serve to flexibly connect adjacent top foil units 31 .

[0036] The same side edge of each top foil unit 31 and the top end of a group of cylindrical pins 2 are fixed together by laser spot welding. Thus, the top foil 3 and the bearing seat 100 are fixed together. After welding, the lower surface of the annular top foil 3 is in contact with the top surface of the cylindrical pin 2, and the corrugated tie 32 is naturally bent and deformed, so that the entire top foil 3 presents a circular sawtooth wave with alternating high and low. Since the corrugated tie 32 has a pulling eff...

Embodiment 3

[0038] In Example 3, on the basis of Example 1 or Example 2, six spacers (not shown in the figure) are added, and three through holes corresponding to the positions of the circular pin holes 102 are opened on each spacer. The hole has a clearance or transition fit with the cylindrical pin 2. Correspondingly, the distance by which the top surface of the cylindrical pin 2 is higher than the end surface of the bearing seat 100 is equal to the thickness of the corrugated foil 1 plus the thickness of the gasket. The gasket is sleeved on the cylindrical pin, which completely eliminates the possibility of the gasket falling off from welding. The thickness of the spacer can be adjusted as required, and the undulating slope of a single top foil unit 31 can be adjusted by covering spacers with different thicknesses.

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PUM

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Abstract

The invention relates to an air bearing, in particular to an air bearing based on submerged bump foil, which comprises N bump foil single bodies, and is characterized in that N groove bodies are uniformly distributed on the end surface of a diffuser or a bearing seat along the axis of the diffuser or the bearing seat, and the N bump foil single bodies are respectively submerged into the N groove bodies; a group of M round pin holes are formed in the same side of each groove body, and the N * M cylindrical pins are in interference fit with the N * M round pin holes respectively; the top end of each cylindrical pin is fixedly connected with the top foil through spot welding; n > = 3 and M > = 1. Compared with the prior art, a bottom plate, a gasket and an installation screw in the prior art are omitted, and parts and machining cost are saved. The bump foil dives into the groove, welding is not needed, and deformation of the bump foil caused by welding is avoided.

Description

technical field [0001] The invention relates to an air bearing, in particular to an air bearing based on a sleeved corrugated foil. Background technique [0002] The invention patent of publication number CN112879318A discloses a high-speed centrifugal compressor, and specifically discloses that the thrust air bearing includes a bottom plate, an intermediate support, and a top layer foil, the bottom plate is annular, and the bottom plate is provided with several cooling grooves along the circumference, The outer edge of the bottom plate is provided with a number of fixed mounting holes; the middle support includes a number of supporting foils and elastic foils, the supporting foils and the elastic foils are fixed on the bottom plate by spot welding, and the supporting foils and the elastic foils are two by two. One set is used to support the top foil; the top foil includes several single foils, the several single foils are arranged in a ring shape, and the flexible connectio...

Claims

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Application Information

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IPC IPC(8): F16C19/12F04D29/057
CPCF16C17/08F16C17/042F04D29/057
Inventor 邢子义丁晓洁王升科谢元豪赵林亭
Owner YANTAI DONGDE IND CO LTD