Rotor driving system supported by permanent magnet composite dynamic pressure air bearing

Abstract

The utility model discloses a rotor driving system supported by a permanent magnet composite dynamic pressure air bearing, which comprises a sleeve, an air bearing core shaft is arranged in the sleeve, and a first air bearing sleeve, a rotor of a permanent magnet brushless motor and a second air bearing sleeve are sleeved on the air bearing core shaft. A rotor of the permanent magnet brushless motor is sleeved with a stator of the permanent magnet brushless motor; a first passive permanent magnet axial thrust bearing is mounted at the first end of the air bearing mandrel, a first permanent magnet axially excluding the first passive permanent magnet axial thrust bearing is mounted at the first end of the sleeve at the same end, and the second end of the air bearing mandrel extends out of the sleeve and is connected with a rotor sliding magnet in an adsorption manner; a second passive permanent magnet axial thrust bearing is mounted at the position, close to the second end of the sleeve, of the air bearing mandrel, and a second permanent magnet axially excluding the second passive permanent magnet axial thrust bearing is mounted at the second end of the sleeve. The revolving cup is higher in rotating speed and more stable in operation under the non-contact support of the air bearing.

Description

Technical Field

[0001] This utility model relates to the field of air-jet spinning machine technology, and more specifically, to a rotor drive system supported by a permanent magnet composite dynamic pressure air bearing. Background Technology

[0002] The rotor of an air-jet spinning machine is a high-speed rotating component in the air-jet spinning process, and its rotational speed directly determines the efficiency and cost of spinning production. Currently, in semi-automatic rotor spinning machines, the rotor is supported by direct bearings and driven by a belt, with an actual maximum rotor speed not exceeding 110,000 rpm. The biggest obstacle to increasing rotor speed is the rotor bearings. Although current bearings use high-precision ceramic balls instead of steel balls, they can only reach 120,000 rpm for short periods. With the increasing demand for high-speed, low-cost spinning production, the existing rolling bearing-supported, belt-driven rotor rotation method is increasingly unable to meet process requirements.

[0003] Therefore, it is necessary to improve the existing technology. Utility Model Content

[0004] The purpose of this utility model is to provide a rotating cup drive system supported by a permanent magnet composite dynamic pressure air bearing, aiming to solve at least one of the technical problems existing in the prior art. To achieve the above objective, the technical solution adopted is as follows:

[0005] A rotating cup drive system supported by a permanent magnet composite dynamic pressure air bearing includes a sleeve, inside which an air bearing mandrel is disposed. A first air bearing sleeve, a rotor of a permanent magnet brushless motor, and a second air bearing sleeve are sequentially mounted on the air bearing mandrel. Both the first and second air bearing sleeves are tightly fitted to the inner wall of the sleeve and have a clearance fit with the outer wall of the air bearing mandrel. The rotor of the permanent magnet brushless motor is tightly fitted to the outer wall of the air bearing mandrel. A stator of the permanent magnet brushless motor is mounted on the rotor of the permanent magnet brushless motor. The stator of the permanent magnet brushless motor is tightly fitted to the inner wall of the sleeve and has a clearance fit with the rotor of the permanent magnet brushless motor.

[0006] A first passive permanent magnet axial thrust bearing is installed at the first end of the air bearing mandrel, and a first permanent magnet that is axially repelled by the first passive permanent magnet axial thrust bearing is installed at the first end of the sleeve at the same end. The second end of the air bearing mandrel extends out of the sleeve and is attracted and connected to the rotating cup sliding magnet. A second passive permanent magnet axial thrust bearing is installed at the position of the air bearing mandrel near the second end of the sleeve, and a second permanent magnet that is axially repelled by the second passive permanent magnet axial thrust bearing is installed at the second end of the sleeve.

[0007] An air intake channel is provided inside the side wall of the sleeve. Both the first air bearing sleeve and the second air bearing sleeve have pressure equalization holes arranged radially on the side wall, and each pressure equalization hole is connected to the air intake channel.

[0008] Preferably, the second permanent magnet is annular and has a clearance fit with the air bearing spindle.

[0009] Preferably, the pressure equalization through-hole is connected to the intake channel via an integrated throttle.

[0010] Preferably, an air supply solenoid valve is provided on the outer wall of the sleeve, and the air inlet channel is connected to the air supply solenoid valve.

[0011] Preferably, heat sinks are provided on the outer wall of the sleeve.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This utility model discloses a rotor drive system supported by a permanent magnet composite dynamic pressure air bearing. Under the non-contact support of the air bearing, the rotor simultaneously exerts two opposing magnetic forces on the spindle of the air bearing, which is driven by a permanent magnet brushless motor. Compared with rolling bearings, it has a higher rotation speed, higher rotational accuracy, smoother operation, low friction and no heat generation, no oil lubrication, and does not pollute the spinning environment, thus improving the quality of spinning products. Attached Figure Description

[0014] To more clearly illustrate the technical solution of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the rotor drive system of this utility model.

[0016] In the diagram: 1. Sleeve; 2. Air bearing mandrel; 3. First air bearing sleeve; 4. Rotor of permanent magnet brushless motor; 5. Second air bearing sleeve; 6. Stator of permanent magnet brushless motor; 7. First passive permanent magnet axial thrust bearing; 8. First permanent magnet; 9. Rotor cup; 10. Second passive permanent magnet axial thrust bearing; 11. Second permanent magnet; 12. Inlet channel; 13. Pressure equalization through hole; 14. Integrated throttle. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] A preferred embodiment of this utility model provides a rotating cup drive system supported by a permanent magnet composite dynamic pressure air bearing.

[0020] like Figure 1 As shown, the system includes a sleeve 1, inside which is an air bearing mandrel 2. A first air bearing sleeve 3, a rotor 4 of a permanent magnet brushless motor, and a second air bearing sleeve 5 are mounted on the air bearing mandrel 2. The rotor 4 of the permanent magnet brushless motor is located between the first air bearing sleeve 3 and the second air bearing sleeve 5. Both the first air bearing sleeve 3 and the second air bearing sleeve 5 are tightly fitted to the inner wall of the sleeve 1, and simultaneously have a clearance fit with the outer wall of the air bearing mandrel 2. The rotor 4 of the permanent magnet brushless motor is tightly fitted to the outer wall of the air bearing mandrel 2. A stator 6 of the permanent magnet brushless motor is mounted on the rotor 4. The stator 6 of the permanent magnet brushless motor is tightly fitted to the inner wall of the sleeve 1, and simultaneously has a clearance fit with the rotor 4. The rotor and stator are the main components of the permanent magnet brushless motor. Of course, the permanent magnet brushless motor also includes other components, which will not be described in detail here.

[0021] A first passive permanent magnet axial thrust bearing 7 is installed at the first end of the air bearing mandrel 2, and a first permanent magnet 8 is installed at the first end of the sleeve 1 at the same end. The first passive permanent magnet axial thrust bearing 7 and the first permanent magnet 8 are axially mutually repelled. The second end of the air bearing mandrel 2 extends out of the sleeve 1 and is attracted and connected to the sliding magnet of the rotating cup 9. This sliding fit is attracted and connected by a strong magnet and is detachable. A second passive permanent magnet axial thrust bearing 10 is installed at the position of the air bearing mandrel 2 near the second end of the sleeve 1. A second permanent magnet 11 is installed at the second end of the sleeve 1. The second permanent magnet 11 is annular, and its outer wall is tightly fitted with the sleeve 1, while its inner wall is clearance-fitted with the outer wall of the air bearing mandrel 2. The second passive permanent magnet axial thrust bearing 10 and the second permanent magnet 11 are axially mutually repelled.

[0022] Based on the above structure, the air bearing mandrel 2 is subjected to two magnetic forces in opposite directions in the axial direction, which makes the air bearing mandrel 2 tend to be balanced in the sleeve 1 and the operation more stable.

[0023] A strip-shaped air intake channel 12 is provided inside the side wall of the sleeve 1 along the length direction of the sleeve. The first air bearing sleeve 3 and the second air bearing sleeve 5 are both provided with pressure equalization through holes 13 in the radial direction on the side wall. Each pressure equalization through hole 13 is connected to the air intake channel 12 through an integrated throttle 14.

[0024] Furthermore, a heat sink and an air supply solenoid valve (not shown in the figure) are provided on the outer wall of the sleeve 1, and the air inlet channel 12 is connected to the air supply solenoid valve.

[0025] When the gas supply solenoid valve is activated, gas enters through the air inlet channel 12 and passes through the pressure equalization through-hole 13 into the gap between the air bearing sleeve and the air bearing mandrel 2. It then exits through the gap between the second permanent magnet 11 and the air bearing mandrel 2. The dynamic pressure effect of the gas in the gap between the air bearing sleeve and the air bearing mandrel 2 generates a supporting force, causing the air bearing mandrel 2 to float. Afterwards, the permanent magnet brushless motor is activated, driving the air bearing mandrel 2 and the rotating cup 9 to rotate.

[0026] In summary, the permanent magnet composite dynamic pressure air bearing supported rotor drive system described in this embodiment of the invention allows the rotor to be supported without contact by the air bearing, while simultaneously exerting two opposing magnetic forces on the air bearing spindle. Driven by a permanent magnet brushless motor, this system offers higher rotational speed, higher rotational accuracy, smoother operation, lower friction and no heat generation, oil-free lubrication, and no pollution of the spinning environment, thus improving the quality of spun yarn products.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A rotating cup drive system supported by a permanent magnet composite dynamic pressure air bearing, characterized in that, The device includes a sleeve, inside which is installed an air bearing mandrel. On the air bearing mandrel, a first air bearing sleeve, a rotor of a permanent magnet brushless motor, and a second air bearing sleeve are sequentially mounted. Both the first and second air bearing sleeves are tightly fitted to the inner wall of the sleeve and also have a clearance fit with the outer wall of the air bearing mandrel. The rotor of the permanent magnet brushless motor is tightly fitted to the outer wall of the air bearing mandrel. The stator of the permanent magnet brushless motor is mounted on the rotor of the permanent magnet brushless motor. The stator of the permanent magnet brushless motor is tightly fitted to the inner wall of the sleeve and also has a clearance fit with the rotor of the permanent magnet brushless motor. A first passive permanent magnet axial thrust bearing is installed at the first end of the air bearing mandrel. A first permanent magnet that is axially repelled by the first passive permanent magnet axial thrust bearing is installed at the first end of the sleeve at the same end. The second end of the air bearing mandrel extends out of the sleeve and is attracted and connected to the rotating cup sliding magnet. A second passive permanent magnet axial thrust bearing is installed at the position of the air bearing mandrel near the second end of the sleeve. A second permanent magnet that is axially repelled by the second passive permanent magnet axial thrust bearing is installed at the second end of the sleeve. The second permanent magnet is annular and has a clearance fit with the air bearing mandrel. An air intake channel is provided inside the side wall of the sleeve. Both the first air bearing sleeve and the second air bearing sleeve have pressure equalization holes arranged radially on the side wall. Each pressure equalization hole is connected to the air intake channel through an integrated throttle. An air supply solenoid valve is provided on the outer wall of the sleeve, and the air intake channel is connected to the air supply solenoid valve.

2. The rotating cup drive system supported by a permanent magnet composite dynamic pressure air bearing according to claim 1, characterized in that, The outer wall of the sleeve is provided with heat dissipation fins.

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