Double-layer bump foil radial bearing with multi-blade top foil

Abstract

The double-layer bump foil radial bearing comprises a bearing seat, a bearing hole is formed in the surface of the bearing seat in the axial direction in a penetrating mode, and a plurality of clamping grooves are formed in the inner surface of the bearing seat at equal intervals in a surrounding mode. A plurality of upper-layer bump foils, a plurality of bottom-layer bump foils and a plurality of multi-blade top foils, which are matched with the clamping grooves for use, are arranged in the bearing seat at equal intervals in a surrounding manner. According to the double-layer bump foil radial bearing with the multi-blade top foils, a plurality of upper-layer bump foils, bottom-layer bump foils and the multi-blade top foils are arranged in the bearing seat at equal intervals in a surrounding manner, and the bottom-layer bump foils, the upper-layer bump foils and the multi-blade top foils in the same direction are embedded into the clamping grooves in sequence, so that the arc sections in the multiple multi-blade top foils are enabled to be clamped in the clamping grooves; a wedge-shaped gas film can be formed when the rotor rotates at a high speed, and the problems that a gas bearing is insufficient in high-speed running stability and small in bearing capacity are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to bearing technical field, concretely is a kind of double-layer wave foil radial bearing with multi-leaf top foil. BACKGROUND

[0002] The foil gas bearing is a self-acting dynamic pressure gas bearing using elastic support, since it uses gas as lubricating medium, has the advantages of low friction resistance, high speed, low maintenance cost, green and sustainable, etc., has wide application in the fields of airplane environmental control system, hydrogen fuel cell air compressor, air suspension centrifugal blower, turbocharger, high-speed oxygen-increasing machine, etc.

[0003] The traditional radial foil gas bearing is formed by the circumferential gas pressure difference using the dynamic pressure effect between rotor and top foil under the high-speed rotation of rotor, to support the high-speed rotation of rotor, since the gas film pressure distribution is uneven, the bearing stability is insufficient, and the bending stress of wave foil is much larger than that of top foil when the bearing is actually stably operated, so the fatigue life of bearing is mainly determined by wave foil, therefore, the single wave foil structure restricts the improvement of bearing life, thus a double-layer wave foil radial bearing with multi-leaf top foil is proposed to solve the existing problems. SUMMARY

[0004] In view of the deficiencies of the prior art, the utility model provides a double-layer wave foil radial bearing with multi-leaf top foil, which solves the problems of insufficient device stability and single wave foil structure restricting the improvement of bearing life.

[0005] To achieve the above object, the utility model is realized by the following technical scheme: a double-layer wave foil radial bearing with multi-leaf top foil, comprising a bearing seat, a bearing hole is formed through the surface of the bearing seat along the axial direction, a plurality of clamping grooves are equidistantly formed on the inner surface of the bearing seat, and a plurality of upper wave foils, bottom wave foils and multi-leaf top foils matched with the clamping grooves are equidistantly arranged in the bearing seat.

[0006] Preferably, the upper wave foil is composed of a protruding upper wave foil fixing segment, an upper wave foil circular-arc protruding segment and an upper wave foil connecting flat segment, the upper wave foil fixing segment is embedded in the inner part of the clamping groove, the bottom wave foil is composed of a protruding bottom wave foil fixing segment, a bottom wave foil circular-arc protruding segment and a bottom wave foil connecting flat segment, and the bottom wave foil fixing segment is embedded in the inner part of the clamping groove, and the upper wave foil circular-arc protruding segment and the bottom wave foil circular-arc protruding segment are both provided with a plurality of segments.

[0007] Preferably, the multi-leaf top foil is composed of a multi-leaf top foil fixing segment and a circular-arc segment, and the multi-leaf top foil fixing segment is embedded in the inner part of the clamping groove, and the bottom wave foil fixing segment, the upper wave foil fixing segment and the multi-leaf top foil fixing segment are embedded in the inner part of the clamping groove in the same direction.

[0008] Preferably, the bearing hole is internally mounted with a rotor. Advantages

[0009] The utility model provides a double -deck wave foil radial bearing with multilobe top foil, has the following beneficial effects compared with prior art: the utility model discloses a plurality of upper layer wave foils, bottom layer wave foils and multilobe top foils are arranged equidistantly in the inside of bearing seat, and the same azimuth bottom layer wave foil, upper layer wave foil and multilobe top foil are embedded in the inside of the card slot in order, the circular arc section in a plurality of multilobe top foils can form wedge -shaped gas film when the rotor high -speed rotates, improve the problem that gas bearing high -speed operation stability is insufficient and carrying capacity is small,

[0010] Secondly, the upper layer wave foil circular arc convex section in the upper layer wave foil is wrapped in the bottom layer wave foil circular arc convex section in the bottom layer wave foil, so that when the bearing carries larger, the bottom layer wave foil circular arc convex section can support the upper layer wave foil circular arc convex section, reduce the stress effect that the upper layer wave foil circular arc convex section bears, thereby increasing the service life of the bearing;

[0011] Secondly, the upper layer wave foil connecting flat section in the upper layer wave foil and the bottom layer wave foil connecting flat section in the bottom layer wave foil are contacted, so that the relative slip of two contact surfaces can also provide certain damping for the bearing, and the stability of the bearing is enhanced;

[0012] Through the plurality of bottom layer wave foil circular arc convex sections and upper layer wave foil circular arc convex sections in the bottom layer wave foil and upper layer wave foil, the change of the increasing arc radian in turn can strengthen the support of the single multilobe top foil different from the bearing seat, so that compared with the prior art of single multilobe top foil and the combination of bottom layer wave foil and multilobe top foil, the firmness of the device can be improved, and the service life can be prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the external structure schematic drawing of the utility model;

[0014] Figure 2 It is the bearing seat internal structure expansion view of the utility model;

[0015] Figure 3 It is the schematic diagram of the card slot structure of the utility model;

[0016] Figure 4 It is the schematic diagram of the upper layer wave foil structure of the utility model;

[0017] Figure 5 It is the schematic diagram of the bottom layer wave foil structure of the utility model;

[0018] Figure 6 It is the schematic diagram of the multilobe top foil structure of the utility model;

[0019] Figure 7 It is a schematic view of the bottom wave foil, the bottom wave foil and the multi-leaf top foil of the utility model.

[0020] In the figure: 1, bearing seat; 2, clamping groove; 3, upper layer wave foil; 31, upper layer wave foil fixed section; 32, upper layer wave foil arc convex section; 33, upper layer wave foil connection flat section; 4, bottom wave foil; 41, bottom wave foil fixed section; 42, bottom wave foil arc convex section; 43, bottom wave foil connection flat section; 5, multi-leaf top foil; 51, multi-leaf top foil fixed section; 52, arc section; 6, rotor; 12, bearing hole. DETAILED DESCRIPTION

[0021] The technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model.

[0022] Please refer to Figures 1-7 The utility model provides a kind of technical scheme: a double-layer wave foil radial bearing with multi-leaf top foil, including bearing seat 1, bearing seat 1 is equipped with bearing hole 12 along the surface of axial direction through, the inside of bearing hole 12 is installed with rotor 6.

[0023] The inner surface of bearing seat 1 is equidistantly provided with a plurality of clamping grooves 2, and the inside of bearing seat 1 is equidistantly provided with a plurality of upper layer wave foils 3, bottom wave foils 4 and multi-leaf top foils 5 matched with the clamping grooves 2;

[0024] The upper layer wave foil 3 is composed of the protruding upper layer wave foil fixed section 31, the upper layer wave foil arc convex section 32 and the upper layer wave foil connection flat section 33, and the upper layer wave foil fixed section 31 is embedded in the inside of the clamping groove 2; the bottom wave foil 4 is composed of the protruding bottom wave foil fixed section 41, the bottom wave foil arc convex section 42 and the bottom wave foil connection flat section 43, and the bottom wave foil fixed section 41 is embedded in the inside of the clamping groove 2; the upper layer wave foil arc convex section 32 and the bottom wave foil arc convex section 42 are both provided with a plurality of; the multi-leaf top foil 5 is composed of the multi-leaf top foil fixed section 51 and the arc section 52, and the multi-leaf top foil fixed section 51 is embedded in the inside of the clamping groove 2; the same orientation bottom wave foil fixed section 41, upper layer wave foil fixed section 31 and multi-leaf top foil fixed section 51 are sequentially embedded in the inside of the clamping groove 2; as detailed explanation: the side of the arc section 52 in contact with the rotor 6 is coated with a wear-resistant coating, and the wear-resistant coating is a molybdenum disulfide coating;

[0025] It should be noted that the curvature of the plurality of upper layer wave foil arc convex sections 32 and the bottom wave foil arc convex sections 42 is increasing, and the plurality of increasing upper layer wave foil arc convex sections 32 are attached to the surface of the multi-leaf top foil 5 at different positions.

[0026] In use, when the rotor 6 rotates at high speed, the multi-leaf top foil 5 and the rotor 6 form a plurality of converging wedge-shaped air films in the circumferential direction, which assists the bearing to operate stably, and the air film load capacity is mainly determined by the upper wave foil 3 and the bottom wave foil 4. When the load is small, the upper wave foil 3 mainly bears, mainly relying on the arc of the upper wave foil arc convex section 32 to support, when the load is large, the upper wave foil 3 and the bottom wave foil 4 jointly bear, and the upper wave foil arc convex section 32 is in contact with the bottom wave foil arc convex section 42 under stress.

Claims

1. A double-layer wave foil radial bearing with multi-leaf top foil, comprising a bearing housing (1), characterized in that: The surface of the bearing seat (1) is provided with a bearing hole (12) in the axial direction, the inner surface of the bearing seat (1) is provided with a plurality of clamping grooves (2) at equal intervals, and the inner part of the bearing seat (1) is provided with a plurality of upper wave foils (3), bottom wave foils (4) and multi-leaf top foils (5) at equal intervals.

2. A dual layer wave foil radial bearing with multi-leaf top foil as claimed in claim 1, wherein: The upper wave foil (3) is composed of a protruding upper wave foil fixed segment (31), an upper wave foil circular arc protruding segment (32) and an upper wave foil connecting flat segment (33), and the upper wave foil fixed segment (31) is embedded in the inner part of the clamping groove (2); the bottom wave foil (4) is composed of a protruding bottom wave foil fixed segment (41), a bottom wave foil circular arc protruding segment (42) and a bottom wave foil connecting flat segment (43), and the bottom wave foil fixed segment (41) is embedded in the inner part of the clamping groove (2); the upper wave foil circular arc protruding segment (32) and the bottom wave foil circular arc protruding segment (42) are both provided with a plurality of segments.

3. A dual layer wave foil radial bearing with multi-leaf top foil as claimed in claim 2, wherein: The multi-leaf top foil (5) is composed of a multi-leaf top foil fixed segment (51) and a circular arc segment (52), and the multi-leaf top foil fixed segment (51) is embedded in the inner part of the clamping groove (2); the bottom wave foil fixed segment (41), the upper wave foil fixed segment (31) and the multi-leaf top foil fixed segment (51) are embedded in the inner part of the clamping groove (2) in the same direction.

4. A dual layer wave foil radial bearing with multi-leaf top foil as claimed in claim 1, wherein: The inner part of the bearing hole (12) is provided with a rotor (6).

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