A synthetic jet-extrusion suspension hybrid bearing

Abstract

The present invention discloses a synthetic jet - squeeze suspension hybrid bearing, which couples the two principles of synthetic jet and squeeze suspension, and includes a synthetic jet device, a squeeze suspension device, a piezoelectric vibrator, a horn, and a lever amplification mechanism. The synthetic jet device includes a closed cylindrical cavity with an outlet, a vibrating diaphragm, an O - ring, and a piezoelectric vibrator. The piezoelectric vibrator is composed of a piezoelectric ceramic sheet and a metal diaphragm. The piezoelectric vibrator performs high - frequency vibration on the vibrating diaphragm at the bottom of the cavity. When the gas pressure difference inside and outside the cavity increases, an air flow with a certain suspension force and velocity will be generated inside the cavity and flow out from the outlet to support an object. The O - ring is used to seal the cylindrical cavity. The squeeze suspension device includes a vibrating disk, a piezoelectric vibrator, and a horn. The horn amplifies the displacement generated by the vibration of the piezoelectric vibrator and directly acts on the vibrating disk to form an acoustic radiation force on the surface of the vibrating disk to support an object. The lever amplification mechanism can amplify the displacement generated by the piezoelectric vibrator and act on the side surface of the cylindrical cavity to cause periodic deformation, which plays a promoting role in the synthetic jet effect. The synthetic jet suspension and the squeeze suspension are coupled with each other and promote each other.

Description

Technical Field

[0001] The present invention relates to the technical field of suspension bearings, and particularly to a synthetic jet-extrusion suspension hybrid bearing. Background Art

[0002] Suspension bearings have the characteristics of no friction, no slip, no pollution, etc. Compared with traditional contact bearings, suspension bearings have the characteristic of no mechanical contact, so the generated heat is very small, the service life is extended, and they are widely used in various high-end equipment.

[0003] At present, synthetic jets are generally more applied in the fields of electronic system heat dissipation, aircraft climbing and diving, and underwater vehicle steering, etc., and less applied in the field of bearings. However, synthetic jets can increase the jet velocity and jet force by optimizing their own structure, adjusting the driving frequency, amplitude, and the distribution of piezoelectric vibrators, so they can be applied in the field of bearings. The extrusion suspension technology is currently relatively mature, but its bearing capacity is limited.

[0004] The present invention couples synthetic jets and extrusion suspension to establish a synthetic jet-extrusion suspension hybrid bearing. The two effects can promote and couple with each other, and finally achieve the effect that one plus one is greater than two. Summary of the Invention

[0005] The present invention discloses a synthetic jet-extrusion suspension hybrid bearing. An upward suspension force is generated by a synthetic jet device. Under the combined action of a piezoelectric vibrator and a horn, the extrusion suspension device will also generate an upward acoustic radiation force to jointly support an object. While vibrating upward, the piezoelectric vibrator will also vibrate downward. The downward vibration directly acts on a lever amplification mechanism, and the lever amplification mechanism acts on the side surface of a cylindrical cavity with the driving force, causing it to generate periodic deformation and promoting the synthetic jet.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] A synthetic jet-extrusion suspension hybrid bearing, the main part of the bearing includes a synthetic jet device, an extrusion suspension device and a lever amplification mechanism, and the synthetic jet device is located in the middle of the bearing structure. The synthetic jet device is composed of a vibrating disk, a jet orifice, a cylindrical cavity, an O-ring, a piezoelectric ceramic sheet, a vibrating film and bolts. The piezoelectric ceramic sheet is attached to the vibrating film below the synthetic jet device. Using the inverse piezoelectric effect of the piezoelectric ceramic, after applying a voltage, it performs periodic high-frequency vibration, causing the vibrating film to also generate high-frequency vibration. Since the vibration frequency is much greater than the rate of gas outflow from the cavity, the gas pressure in the cavity increases, and a large pressure difference is generated between the inside and outside of the cavity. Therefore, a stable jet with a certain suspension force is generated at the jet orifice to support the suspension disk. The extrusion suspension device is composed of a vibrating disk, an air film, a horn and a piezoelectric vibrator. The piezoelectric vibrator is composed of four identical piezoelectric ceramic sheets stacked together and is connected to the lower end of the horn. The horn amplifies the displacement generated by the vibration of the piezoelectric vibrator and acts on the lower part of the vibrating disk, causing the upper surface of the vibrating disk to resonate and generate acoustic radiation force to support the suspension disk. At this time, an air film will be formed between the vibrating disk and the suspension disk. It should be noted that the vibrating disk is both a structure for forming extrusion suspension and one of the structures for forming a sealed cavity for synthetic jet. The lever amplification mechanism is composed of flexible hinges, flexible hinges, a fixing device, steel balls, springs and levers. The rotational stiffness of the flexible hinge is small. One end of it is in contact with the lower surface of the piezoelectric vibrator, and the other end is in contact with the lever, so as to ensure that the force generated downward by the piezoelectric vibrator acts completely on the lever. The flexible hinge serves as the rotation fulcrum of the lever, and the lever rotates repeatedly around the flexible hinge. The lever amplifies the displacement generated by the piezoelectric vibrator and acts on the side surface of the cylindrical cavity, causing it to deform and promoting the synthetic jet.

[0008] As a preference of the present invention, the vibrating disk, the jet orifice, the inside of the cylindrical cavity, the cylindrical cavity, the suspension disk, the O-ring and the vibrating film are all cylindrical, and the O-ring seals the cylindrical cavity.

[0009] As a preference of the present invention, the bolts are used to fix the cylindrical cavity, the O-ring and the vibrating film. There are a total of 8 bolts, which are symmetrically distributed in a circle along the outer side of the cylindrical cavity, and the piezoelectric ceramic sheet is attached to the lower surface of the vibrating film.

[0010] As a preference of the present invention, the number of horns and piezoelectric vibrators is 4 each, and they are symmetrically distributed along the outer side of the cylindrical cavity. The upper surface of each horn is in contact with the lower surface of the vibrating disk, and each piezoelectric vibrator is composed of 4 identical piezoelectric ceramic sheets combined.

[0011] As a preference of the present invention, there are four sets of the lever amplification mechanism, which are also symmetrically distributed along the outer side of the cavity. The flexible hinge of each set of the lever amplification mechanism is in contact with the lower surface of the piezoelectric vibrator, and the fixing device is fixed to the bottom surface or the experimental table to fix and limit the lever amplification mechanism.

[0012] As a preference of the present invention, the suspension force generated jointly by the synthetic jet and the squeeze suspension supports the suspension disk, and a gas film with a certain pressure and thickness will be formed between the vibrating disk and the suspension disk.

[0013] As a preference of the present invention, both ends of the vibrating disk are processed into an inverted V shape, so that the force and displacement acting on the lower surface of the vibrating disk by the horn can be more concentrated and more uniform.

[0014] As a preference of the present invention, there are four sets of the lever amplification mechanism in total, which are all fixed at the same horizontal height and evenly distributed on the outer side of the cylindrical cavity.

[0015] As a preference of the present invention, the piezoelectric vibrator and the horn are in coaxial contact. The piezoelectric vibrator is formed by coaxially bonding four piezoelectric ceramic sheets of the same size.

[0016] An advantage of the synthetic jet-squeeze suspension hybrid bearing provided by the present invention is that:

[0017] This bearing supports the object in a suspended manner, avoiding mechanical contact, thereby reducing friction and heat generation, and being able to extend the service life.

[0018] This bearing adopts the synthetic jet and squeeze suspension hybrid support method, coupling the excellent performance of the two principles, improving the suspension force and suspension height of the bearing. At the same time, the lever amplification mechanism will amplify the force and displacement generated by the squeeze vibration and act on the side surface of the cylindrical cavity to promote the synthetic jet.

[0019] This bearing can increase the supply voltage of the piezoelectric vibrator, increase the vibration frequency, improve the effects of the synthetic jet and the squeeze suspension, and finally increase the suspension force and suspension height to achieve active control. Description of the Drawings

[0020] In order to more clearly introduce the technical solutions in the embodiments of the present invention, the drawings required for the embodiments of the present invention are introduced in detail below. Obviously, the following-introduced drawings are only one embodiment of the present invention. For other scholars and engineering technicians in the field, other structural designs can be made according to these drawings without creative labor. Among them:

[0021] Figure 1 It is the overall structure plan view of the embodiment of the present invention;

[0022] Figure 2 Three - view drawings and three - dimensional structure diagrams of the synthetic jet device according to the embodiments of the present invention;

[0023] Figure 3 Three - dimensional structure diagram of the extrusion suspension device according to the embodiments of the present invention;

[0024] Figure 4 Planar structure diagram of the lever amplification mechanism according to the embodiments of the present invention;

[0025] Figure 5 Schematic diagrams of the piezoelectric ceramic sheet and the piezoelectric vibrator in the embodiments of the present invention.

[0026] Among them, 1 is the vibrating disc, 2 is the air film, 3 is the jet orifice, 4 is the interior of the cavity, 5 is the cylindrical cavity, 6 is the suspension disc, 7 is the horn, 8 is the piezoelectric vibrator, 9 is the flexible hinge, 10 is the flexible hinge, 11 is the fixing device of the lever amplification mechanism, 12 is the steel ball, 13 is the O - ring, 14 is the piezoelectric ceramic sheet, 15 is the vibrating film, 16 is the bolt, 17 is the spring, 18 is the lever mechanism. Detailed implementation manners

[0027] The technical solutions in the embodiments of the present invention will be described completely, in detail and clearly below with reference to the accompanying drawings in the embodiments of the present invention.

[0028] The main part of the bearing includes a synthetic jet device, an extrusion suspension device and a lever amplification mechanism. The synthetic jet device is in the middle of the bearing structure. The synthetic jet device is composed of a vibrating disc 1, a jet orifice 3, a cylindrical cavity 5, an O - ring 13, a piezoelectric ceramic sheet 14, a vibrating film 15 and a bolt 16. The piezoelectric ceramic sheet 14 is attached to the vibrating film 15 below the synthetic jet device. Utilizing the inverse piezoelectric effect of the piezoelectric ceramic, after applying a voltage, it performs periodic high - frequency vibration, causing the vibrating film 15 to also generate high - frequency vibration. Since the vibration frequency is much greater than the rate of gas flowing out of the cavity, the gas pressure in the cavity increases, and a large pressure difference is generated between the inside and outside of the cavity. Thus, a stable jet with a certain suspension force is generated at the jet orifice to support the suspension disc 6.

[0029] The extrusion suspension device is composed of a vibrating disc 1, an air film 2, a horn 7 and a piezoelectric vibrator 8. The piezoelectric vibrator 8 is composed of four identical piezoelectric ceramic sheets stacked together and is connected to the lower end of the horn 7. The horn 7 amplifies the displacement generated by the vibration of the piezoelectric vibrator 8 and acts on the lower surface of the vibrating disc 1, causing the upper surface of the vibrating disc 1 to resonate to generate an acoustic radiation force to support the suspension disc 6. At this time, an air film will be formed between the vibrating disc 1 and the suspension disc 6. It should be noted that the vibrating disc 1 is both a structure for forming extrusion suspension and one of the structures for forming a sealed cavity for the synthetic jet.

[0030] The lever amplification mechanism is composed of a flexible hinge 9, a flexible hinge 10, a fixing device 11, a steel ball 12, a spring 17, and a lever 18. The rotational stiffness of the flexible hinge 9 is relatively small. One end of it is in close contact with the lower surface of the piezoelectric vibrator 8, and the other end is in close contact with the lever 18. In this way, it can ensure that the force generated downward by the piezoelectric vibrator 8 acts completely on the lever 18 without loss of the elongation deformation of the piezoelectric vibrator 8. The flexible hinge 10 serves as the rotation fulcrum of the lever 18. The lever 18 rotates repeatedly around the flexible hinge 10. The lever amplifies the displacement generated by the piezoelectric vibrator and acts on the side of the cylindrical cavity, causing it to deform and promoting the synthetic jet.

[0031] When the piezoelectric vibrator vibrates, the lever 18 of the lever amplification mechanism will vibrate downward at the same time, causing the steel ball 12 to be squeezed and the spring 17 to be compressed. When the piezoelectric vibrator returns to its original position, the elastic force of the spring causes the steel ball to return to its initial position to complete the reset work.

[0032] Four sets of the extrusion suspension devices are provided, and can be set to 8 sets or 12 sets according to specific situations, and are symmetrically distributed in a circle along the outer side of the cavity. The function of the extrusion suspension device is to generate acoustic radiation force on the surface of the vibrating disk through the high-frequency vibration of the piezoelectric vibrator to support the suspension disk.

[0033] Four sets of the lever amplification mechanisms are also provided, and can be set to 8 sets or 12 sets according to specific situations. The overall lever amplification mechanism is symmetrically distributed in a circle along the outer side of the cavity. Its function is to amplify the force and displacement generated by the downward vibration of the piezoelectric vibrator and act on the side of the cylindrical cavity again, so that while the bottom of the cavity vibrates, vibration also occurs on the side, making the gas change amount in the cavity as large as possible to generate a larger and stronger jet.

[0034] The three components of the flexible hinge 10, the steel ball 12, and the spring 17 of the lever amplification mechanism are all fixed on the fixing device 11, and the fixing device 11 is fixed on the experimental table or other horizontal surfaces.

[0035] The vibrating disk 1 has an inverted eight-shaped frustum structure, which can make the force and displacement transmitted by the horn more concentrated and produce a better suspension effect.

[0036] The horn 7 and the piezoelectric vibrator 8 are already assembled and installed during the processing stage. During operation, an AC signal power supply needs to be connected to provide voltages of different magnitudes to make the piezoelectric vibrator generate different driving frequencies and amplitudes.

[0037] The vibrating disk 1 and the cylindrical cavity 5 are made of aluminum. The flexible hinge 9 and the flexible hinge 10 are made of spring steel (65Mn). The O-ring 13 is made of polymer rubber. The vibrating film 15 is made of carbon fiber. The lever 18 is made of a material with light weight and relatively large stiffness.

[0038] It should be noted that the above-described content is only one embodiment of the present invention and should not be construed as a limitation of the present invention. For those skilled in the art of engineering, various modifications can be made on this basis, and all of them fall within the protection scope of the present invention without creative labor.

Claims

1. A synthetic jet-extrusion suspension hybrid bearing, characterized in that, the main part of the bearing includes a synthetic jet device, an extrusion suspension device and a lever amplification mechanism. The synthetic jet device is located in the middle of the bearing structure; the synthetic jet device is composed of a vibrating disk (1), a jet orifice (3), a cylindrical cavity (5), an O-ring (13), a piezoelectric ceramic sheet (14), a vibrating film (15) and a bolt (16). The piezoelectric ceramic sheet (14) is attached to the vibrating film (15) below the synthetic jet device. Using the inverse piezoelectric effect of the piezoelectric ceramic, after applying a voltage, it performs periodic high-frequency vibration, causing the vibrating film (15) to also generate high-frequency vibration. Since the vibration frequency is much greater than the rate of gas outflow from the cavity, the gas pressure in the cavity increases, and a pressure difference is generated between the inside and outside of the cavity. Therefore, a stable jet with a certain suspension force is generated at the jet orifice to support the suspension disk (6); the extrusion suspension device is composed of a vibrating disk (1), an air film (2), a horn (7) and a piezoelectric vibrator (8). The piezoelectric vibrator (8) is stacked by four identical piezoelectric ceramic sheets and is connected to the lower end of the horn (7). The horn (7) amplifies the displacement generated by the vibration of the piezoelectric vibrator (8) and acts on the lower surface of the vibrating disk (1), causing the upper surface of the vibrating disk (1) to resonate and generate acoustic radiation force to support the suspension disk (6). At this time, an air film will be formed between the vibrating disk (1) and the suspension disk (6); the vibrating disk (1) is both a structure for forming extrusion suspension and one of the structures for forming a sealed cavity for the synthetic jet; the lever amplification mechanism is composed of a flexible hinge (9), a flexible hinge (10), a fixing device (11), a steel ball (12), a spring (17) and a lever (18). The rotational stiffness of the flexible hinge (9) is relatively small. One end of it is in contact with the lower surface of the piezoelectric vibrator (8), and the other end is in contact with the lever (18). The force generated by the piezoelectric vibrator (8) downward acts completely on the lever (18); the flexible hinge (10) serves as the rotation fulcrum of the lever (18). The lever (18) rotates repeatedly around the flexible hinge (10). The lever amplifies the displacement generated by the piezoelectric vibrator and acts on the side surface of the cylindrical cavity, causing it to deform and promoting the synthetic jet; after the piezoelectric vibrator (8) and the piezoelectric ceramic sheet (14) are energized, they respectively generate extrusion suspension force and synthetic jet suspension force. The piezoelectric vibrator (8) transmits its own vibration to the side surface of the cylindrical cavity (5) through the lever amplification mechanism, causing it to vibrate and compress the volume of the cavity, promoting the synthetic jet effect. The two can be coupled with each other; the vibration phase of the piezoelectric vibrator (8) of the extrusion suspension device is adjustable, and the vibration phase of the piezoelectric ceramic sheet (14) of the synthetic jet device is also adjustable. The two can achieve active control during the coupling process and produce different suspension effects.

2. The synthetic jet-extrusion suspension hybrid bearing according to claim 1, characterized in that: The vibrating disk (1), jet orifice (3), inside of the cylindrical cavity (4), cylindrical cavity (5), suspension disk (6), O-ring (13) and vibrating diaphragm (15) are all cylindrical, and the O-ring (13) seals the cylindrical cavity (5).

3. A synthetic jet-extrusion suspension hybrid bearing according to claim 1, characterized in that: The bolts (16) are used to fix the cylindrical cavity, O-ring (13) and vibrating diaphragm (15). There are 8 bolts (16) in total, which are symmetrically distributed in a circular pattern along the outer side of the cylindrical cavity. The piezoelectric ceramic sheets (14) are attached to the lower surface of the vibrating diaphragm (15).

4. A synthetic jet-extrusion suspension hybrid bearing according to claim 1, characterized in that: The number of horn (7) and piezoelectric vibrator (8) are both 4, which are symmetrically distributed along the outer side of the cylindrical cavity. The upper surface of each horn is in contact with the lower surface of the vibrating disk (1). Each piezoelectric vibrator is composed of 4 identical piezoelectric ceramic sheets combined together.

5. A synthetic jet-extrusion suspension hybrid bearing according to claim 1, characterized in that: There are 4 sets of lever amplification mechanisms, which are also symmetrically distributed along the outer side of the cavity. The flexible hinge (9) of each set of lever amplification mechanisms is in contact with the lower surface of the piezoelectric vibrator. The fixing device (11) is fixed to the bottom surface or the test bench to fix and limit the lever amplification mechanism.

6. A synthetic jet-extrusion suspension hybrid bearing according to claim 1, characterized in that: The suspension force generated jointly by the synthetic jet and extrusion suspension supports the suspension disk (6), and an air film (2) with a certain pressure and thickness will be formed between the vibrating disk (1) and the suspension disk (6).

7. A synthetic jet-extrusion suspension hybrid bearing according to claim 1, characterized in that: Both ends of the vibrating disk (1) are processed into an inverted V shape, so that the force and displacement acting on the lower surface of the vibrating disk (1) by the horn (7) can be concentrated and uniform.

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