A rapid measurement device for take-off speed of radial air foil bearing

Abstract

The invention discloses a rapid measuring device for the takeoff speed of a radial air foil bearing, comprising: a rotating shaft mounted on an output shaft of a motor; a bearing seat sleeve mounted on the rotating shaft; a radial air foil bearing mounted in the bearing seat, and an inner hole of the radial air foil bearing is mounted in cooperation with the rotating shaft; a loading mechanism is connected to the bearing seat, and the loading mechanism applies a load to the radial air foil bearing through the bearing seat; a measuring mechanism comprises an indicator light and a power supply, and the two ends of a series circuit of the indicator light and the power supply are electrically connected to the bearing seat and the rotating shaft respectively. When the motor stops, under the action of the loading mechanism, the rotating shaft fits the radial air foil bearing to be measured, the measuring mechanism circuit is closed, and the indicator light is on. After the motor is started, the rotating shaft is separated from the radial air foil bearing, the measuring mechanism circuit is disconnected, the indicator light becomes dark, and the speed recorded at this moment is the takeoff speed of the radial air foil bearing to be measured under this working condition, which can avoid measuring friction torque, reduce the measurement difficulty, and achieve high-precision measurement.

Description

Technical Field

[0001] The invention relates to the technical field of fluid dynamic pressure lubrication, and in particular to a rapid measurement device for the take-off rotation speed of a radial air foil bearing. Background Art

[0002] The radial air foil bearing is a hydrodynamic lubricated bearing that uses ambient air as the lubricating medium. The bearing uses the air sucked in by the rotating rotor to form a high-pressure lubricating air film to achieve radial support for the rotor and keep the rotor in a "suspended state", which can significantly reduce mechanical wear and extend the service life of the shaft system. Since no additional booster or cooling device is required, the radial air foil bearing has the advantages of simple structure, small size, and maintenance-free, and can be widely used in high-speed rotating machinery.

[0003] The take-off speed reflects the minimum speed at which the radial air foil bearing can operate normally under given working conditions and is one of the important performance parameters of the radial air foil bearing.

[0004] The patents that have been published so far on the measurement of takeoff speed of radial air foil bearings usually use the scheme of using friction torque to judge the takeoff state of the bearing. These schemes need to measure the friction torque of the bearing, but the bearing is in an unstable state during takeoff, and the measurement of friction torque is difficult and has low accuracy. Therefore, the takeoff speed measured by these schemes is not accurate enough and cannot meet the high-precision test requirements. Summary of the invention

[0005] The present application provides a rapid measurement device for the takeoff speed of a radial air foil bearing, which solves the technical problem of high difficulty and low precision in measuring the takeoff speed of a radial air foil bearing by friction torque in the prior art.

[0006] The present application provides a rapid measurement device for the take-off speed of a radial air foil bearing, comprising:

[0007] A motor, wherein the motor is mounted on a base plate;

[0008] A rotating shaft, the rotating shaft being mounted on an output shaft of the motor;

[0009] A bearing seat, wherein the bearing seat is sleeved on the rotating shaft;

[0010] A radial air foil bearing, wherein the radial air foil bearing is installed in the bearing seat, and the inner hole of the radial air foil bearing is installed in cooperation with the rotating shaft;

[0011] a loading mechanism, the loading mechanism being connected to the bearing seat, the loading mechanism applying a load to the radial air foil bearing through the bearing seat;

[0012] The measuring mechanism comprises an indicator light and a power supply connected in series, and two ends of the series circuit of the indicator light and the power supply are electrically connected to the bearing seat and the rotating shaft respectively.

[0013] In some embodiments, the rotating shaft is fixedly connected to the output shaft of the motor via a clamp.

[0014] In some embodiments, a rotation speed sensor and a rotation speed display meter are also included, and the rotation speed sensor and the rotation speed display meter are both mounted on the base plate, the rotation speed sensor and the rotation speed display meter are electrically connected, and the detection head of the rotation speed sensor is arranged corresponding to the rotating shaft.

[0015] In some embodiments, the loading mechanism includes a pulley frame, a rigid rope and a load weight. The pulley frame is fixedly disposed on the base plate, a fixed pulley is mounted on the pulley frame, the rigid rope passes around the fixed pulley, one end of the rigid rope is fixedly connected to the bearing seat, and the other end of the rigid rope is fixedly connected to the load weight.

[0016] In some embodiments, the number of the fixed pulleys is two.

[0017] In some embodiments, the centers of gravity of the load weight, rigid rope, and bearing seat are located in the same vertical plane.

[0018] In some embodiments, the measuring mechanism further comprises a circuit rack, the circuit rack is mounted on a base plate, and the indicator light and the power supply are mounted on the circuit rack.

[0019] In some embodiments, the measuring mechanism also includes a touch rod and a locking block, one end of the touch rod is connected to the wire of the measuring mechanism, a recess is provided at the end of the rotating shaft, the other end of the touch rod contacts the recess, the locking block is fixedly provided on the bottom plate, and the touch rod is clamped on the locking block.

[0020] In some embodiments, the touch rod is coaxially arranged with the rotating shaft.

[0021] In some embodiments, the locking block is made of insulating material.

[0022] The beneficial effects of this application are as follows:

[0023] The invention provides a rapid measurement device for the takeoff speed of a radial air foil bearing. When the motor stops, under the action of a loading mechanism, the rotating shaft fits the radial air foil bearing to be measured, the circuit of the measuring mechanism is closed, and the indicator light is on. When the motor starts and gradually accelerates, a lubricating gas film is formed between the rotating shaft and the radial air foil bearing to be measured, so that the two are separated. At this time, the circuit is disconnected, the indicator light becomes dark, and the speed recorded at this moment is the takeoff speed of the radial air foil bearing to be measured under this working condition, thereby avoiding the measurement of friction torque, reducing the measurement difficulty, and achieving high-precision measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention.

[0025] Figure 1 A schematic diagram of the overall structure of the measuring device provided in this application;

[0026] Figure 2 A schematic diagram of the specific structure of the cooperation between the rotating shaft and the bearing seat in the measuring device provided in this application;

[0027] Figure 3 This is a schematic diagram of the structure of the locking block and the feeler rod in the measuring device provided in the present application.

[0028] Among them, 1-base plate; 3-motor; 4-speed display meter; 5-speed sensor; 6-pulley frame; 7-rigid rope; 9-fixed pulley; 10-load weight; 13-power supply; 14-indicator light; 15-circuit stand; 16-rotating shaft; 17-radial air foil bearing; 18-bearing seat; 19-clamp; 20-pit; 21-touch rod; 22-locking block. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0032] The embodiment of the present application solves the technical problem of high difficulty and low precision in measuring the takeoff speed of a radial air foil bearing by friction torque in the prior art by providing a rapid measurement device for the takeoff speed of a radial air foil bearing.

[0033] The technical solution in the embodiment of the present application is to solve the above technical problems, and the overall idea is as follows:

[0034] like Figure 1 , Figure 2 As shown, the present application provides a rapid measurement device for the take-off speed of a radial air foil bearing 17, comprising:

[0035] A motor 3, wherein the motor 3 is mounted on the base plate 1;

[0036] A rotating shaft 16, wherein the rotating shaft 16 is mounted on the output shaft of the motor 3;

[0037] A bearing seat 18, wherein the bearing seat 18 is sleeved on the rotating shaft 16;

[0038] A radial air foil bearing 17, wherein the radial air foil bearing 17 is installed in the bearing seat 18, and the radial air foil bearing 17 is installed in cooperation with the rotating shaft 16;

[0039] A loading mechanism, the loading mechanism is connected to the bearing seat 18, and the loading mechanism applies a load to the radial air foil bearing 17 through the bearing seat 18;

[0040] The measuring mechanism includes an indicator light 14 and a power source 13 connected in series, and two ends of the series circuit of the indicator light 14 and the power source 13 are electrically connected to the bearing seat 18 and the rotating shaft 16 respectively.

[0041] Specifically, the rotating shaft 16 is fixedly connected to the output shaft of the motor 3 via a clamp 19 .

[0042] The measuring device also includes a speed sensor 5 and a speed display meter 4 , both of which are mounted on the base plate 1 , and are electrically connected to each other. The detection head of the speed sensor 5 is arranged corresponding to the rotating shaft 16 .

[0043] When the motor 3 stops, under the action of the loading mechanism, the rotating shaft 16 fits with the radial air foil bearing 17 to be measured, the circuit of the measuring mechanism is closed, and the indicator light 14 lights up. When the motor 3 starts and gradually accelerates, a lubricating gas film is formed between the rotating shaft 16 and the radial air foil bearing 17 to be measured, so that the two are separated. At this time, the circuit is disconnected, the indicator light 14 becomes dark, and the speed recorded at this moment is the take-off speed of the radial air foil bearing 17 to be measured under this working condition, avoiding the measurement of friction torque, reducing the measurement difficulty, and achieving high-precision measurement;

[0044] In the prior art, the take-off state of the radial air foil bearing 17 is usually determined by measuring mechanical physical quantities, such as measuring the friction torque, while the present invention determines the take-off state of the radial air foil bearing 17 by means of the opening and closing of the circuit;

[0045] It does not need to measure the friction torque of the bearing, and eliminates the need for pressure sensors, transmitters and other measuring equipment. The device has a simple structure and low cost.

[0046] By opening and closing the circuit (brightness or darkness of the indicator light 14), the take-off state of the radial air foil bearing 17 can be intuitively determined;

[0047] By means of the brightness of the indicator light 14 and the reading of the rotation speed display table 4, the take-off rotation speed of the radial air foil bearing 17 can be measured quickly and accurately.

[0048] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0049] Specifically, the loading mechanism includes a pulley frame 6, a rigid rope 7 and a load weight 10. The pulley frame 6 is fixedly arranged on the base plate 1. A fixed pulley 9 is installed on the pulley frame 6. The rigid rope 7 passes around the fixed pulley 9. One end of the rigid rope 7 is fixedly connected to the bearing seat 18, and the other end of the rigid rope 7 is fixedly connected to the load weight 10.

[0050] The number of the fixed pulleys 9 is two, and the centers of gravity of the load weight 10, the rigid rope 7 and the bearing seat 18 are located in the same vertical plane.

[0051] The loaded weight 10 lifts the bearing seat 18 upward through the fixed pulley 9 and the rigid rope 7, so that the radial air foil bearing 17 contacts the rotating shaft 16, the measuring mechanism circuit is closed, and the indicator light 14 lights up. Through the setting of the two fixed pulleys 9, the loading mechanism is prevented from shaking and the loading stability is improved.

[0052] Furthermore, the measuring mechanism also includes a circuit stand 15, which is installed on the base plate 1, and the indicator light 14 and the power supply 13 are installed on the circuit stand 15, so that the wires of the measuring mechanism are located on the same plane as the rotating shaft 16 and the bearing seat 18, thereby avoiding the influence of the rotation of the rotating shaft 16 on the circuit of the measuring mechanism.

[0053] Further, such as Figure 3 As shown, the measuring mechanism also includes a feeler rod 21 and a locking block 22, one end of the feeler rod 21 is connected to the wire of the measuring mechanism, a concave point 20 is provided at the end of the rotating shaft 16, the other end of the feeler rod 21 contacts the concave point 20, the locking block 22 is fixedly arranged on the bottom plate 1, the feeler rod 21 is clamped on the locking block 22, the feeler rod 21 is coaxially arranged with the rotating shaft 16, and the material of the locking block 22 is an insulating material.

[0054] The wire of the measuring mechanism contacts the rotating shaft 16 through the feeler rod 21 . The concave point 20 can make the feeler rod 21 and the rotating shaft 16 cooperate more stably. At the same time, a certain preload force is maintained between the feeler rod 21 and the rotating shaft 16 to ensure stable contact between the feeler rod 21 and the rotating shaft 16 .

[0055] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0056] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A rapid measurement device for take-off speed of radial air foil bearing, characterized in that: include: A motor, wherein the motor is mounted on a base plate; A rotating shaft, the rotating shaft being mounted on an output shaft of the motor; A bearing seat, wherein the bearing seat is sleeved on the rotating shaft; A radial air foil bearing, wherein the radial air foil bearing is installed in the bearing seat, and the inner hole of the radial air foil bearing is installed in cooperation with the rotating shaft; a loading mechanism, the loading mechanism being connected to the bearing seat, the loading mechanism applying a load to the radial air foil bearing through the bearing seat; A measuring mechanism, wherein the measuring mechanism comprises an indicator light and a power supply connected in series, and the two ends of the series circuit of the indicator light and the power supply are electrically connected to the bearing seat and the rotating shaft respectively; the measuring mechanism also comprises a feeler rod and a locking block, one end of the feeler rod is connected to the wire of the measuring mechanism, a concave point is provided at the end of the rotating shaft, and the other end of the feeler rod contacts the concave point, and the locking block is fixedly arranged on the bottom plate, and the feeler rod is clamped on the locking block; The rotating shaft is fixedly connected to the output shaft of the motor through a clamp; A speed sensor and a speed display meter, both of which are mounted on the bottom plate, the speed sensor and the speed display meter are electrically connected, and a detection head of the speed sensor is arranged corresponding to the rotating shaft; The loading mechanism comprises a pulley frame, a rigid rope and a loading weight, wherein the pulley frame is fixedly arranged on the bottom plate, a fixed pulley is installed on the pulley frame, the rigid rope passes around the fixed pulley, one end of the rigid rope is fixedly connected to the bearing seat, and the other end of the rigid rope is fixedly connected to the loading weight, and the center of gravity of the loading weight, the rigid rope and the bearing seat is located in the same vertical plane; The measuring mechanism further comprises a circuit rack, the circuit rack is mounted on the bottom plate, and the indicator light and the power supply are mounted on the circuit rack; The touch rod is coaxially arranged with the rotating shaft; When the motor stops, under the action of the loading mechanism, the rotating shaft fits with the radial air foil bearing to be tested, the circuit of the measuring mechanism is closed, and the indicator light is on; when the motor starts and gradually accelerates, a lubricating gas film is formed between the rotating shaft and the radial air foil bearing to be tested, so that the two are separated, and the circuit is disconnected at this time, the indicator light becomes dark, and the speed recorded at this moment is the take-off speed of the radial air foil bearing to be tested under this working condition, avoiding the measurement of friction torque, reducing the measurement difficulty, and achieving high-precision measurement; The wire of the measuring mechanism contacts the rotating shaft through the feeler rod. The concave point can make the feeler rod and the rotating shaft cooperate more stably. At the same time, a certain preload force is maintained between the feeler rod and the rotating shaft to ensure stable contact between the feeler rod and the rotating shaft.

2. The rapid measurement device for takeoff speed of radial air foil bearing according to claim 1, characterized in that: The number of the fixed pulleys is two.

3. The rapid measurement device for take-off speed of radial air foil bearing according to claim 1, characterized in that: The locking block is made of insulating material.

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