A dynamic excitation device for high-speed rotating equipment, its usage method and application

Abstract

The present invention discloses a dynamic excitation device for a high-speed rotating device, its usage method and application. The dynamic excitation device for the high-speed rotating device includes a flange fixedly installed on the high-speed rotating device, a pump body fixedly connected to the flange, a cylinder body installed below the pump body, and a guide ring driven by the high-speed rotating device and rotating in the pump body; an exciter is installed in the pump body, and the exciter provides an external excitation for the guide ring. The dynamic excitation device for the high-speed rotating device can excite the rotor system of its rotating components under the high-speed operation state of the rotating device by applying an excitation to the guide ring through the exciter, and can dynamically excite the first bending vibration mode of the rotor.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration testing, and particularly to a dynamic excitation device for high-speed rotating equipment, its usage method, and application. Background Art

[0002] High-speed rotating equipment is widely used in the production of various stable isotopes. The rotor dynamics analysis and testing technology thereof has attracted much attention in the development of machine models and industrial applications. Different from conventional low-speed rotating machinery products, high-speed rotating equipment has strict requirements for the rotational speed and reliability index of the rotating component - the rotor. Therefore, the research on the rotor dynamics problem of high-speed rotating equipment is extremely crucial.

[0003] For subcritical high-speed rotating equipment, it is required that the ratio of the first bending critical frequency of the rotor to the working rotational frequency is greater than 1. Due to the existence of the gyroscopic effect, the modal frequency of the rotating component - the rotor system changes with the rotational speed, and the modal frequency obtained by exciting the rotor statically cannot represent the critical frequency of the rotor. Limited by the test equipment and the strength of the rotor, there is currently no ability to obtain the critical frequency through an acceleration test method. There has been no systematic theoretical and experimental research work on the excitation test in the rotating state of the rotor. The critical frequency is mainly obtained by theoretical analysis means, and there is no direct experimental test data support. With the improvement of the development level of high-speed rotating equipment, the research on rotor dynamic excitation technology has become increasingly urgent. Achieving rotor dynamic excitation testing is of great significance for improving the stability evaluation level of existing high-speed rotating equipment. Summary of the Invention

[0004] The purpose of the present invention is to provide a dynamic excitation device for high-speed rotating equipment to address the technical defects existing in the prior art.

[0005] Another purpose of the present invention is to provide a usage method for the above-mentioned dynamic excitation device for high-speed rotating equipment.

[0006] Another purpose of the present invention is to provide an application of the above usage method in dynamic excitation testing.

[0007] The technical solution adopted to achieve the purpose of the present invention is as follows:

[0008] A dynamic excitation device for high-speed rotating equipment includes a flange fixedly installed on the high-speed rotating equipment, a pump body fixedly connected to the flange, a cylinder body installed below the pump body, and a guide ring driven by the high-speed rotating equipment and rotating in the pump body; an exciter is installed in the pump body, and the exciter provides an external excitation for the guide ring.

[0009] In the above technical solution, a threaded hole is provided on the side surface of the pump body.

[0010] In the above technical solution, a thread is provided on the surface of the vibrator, and the vibrator is installed in the threaded hole through the thread.

[0011] In the above technical solution, the vibrator is 1 mm away from the lower end surface of the flange.

[0012] In the above technical solution, the working end face of the vibrator is close to the inner wall edge of the pump body.

[0013] In the above technical solution, the working end face of the vibrator is 1 mm away from the guide ring.

[0014] In the above technical solution, the upper part of the pump body and the flange are connected by screwing.

[0015] In the above technical solution, the lower part of the pump body is in interference connection with the cylinder body.

[0016] On the other hand of the present invention, a method for using the above dynamic vibration excitation device for high-speed rotating equipment includes the following steps:

[0017] S1: Install the vibrator inside the pump body; connect the guide ring to the high-speed rotating equipment and place it in the cavity inside the pump body.

[0018] S2: Turn on the high-speed rotating equipment to drive the guide ring to rotate.

[0019] S3: Turn on the vibrator and set the sweep frequency excitation mode; the electromagnetic force generated by the vibrator excites the guide ring to vibrate along the axial direction of the vibrator.

[0020] S4: Measure the vibration response of the rotor under excitation, judge by the peak value of the FFT transformation, and record the first bending vibration frequency and the corresponding amplitude value of the rotor.

[0021] In the above technical solution, in S2, the rotation speed of the guide ring is less than or equal to 500 r / min, and the output electromagnetic force is less than 3 N.

[0022] In the above technical solution, the starting frequency of the sweep frequency excitation mode is 1900 Hz; the ending frequency is 2000 Hz.

[0023] In the above technical solution, the sweep frequency interval of the sweep frequency excitation mode is 1 Hz.

[0024] On the other hand of the present invention, the application of the above method in dynamic vibration excitation testing.

[0025] On the other hand of the present invention, first, through the above method, the rotation speeds of the guide ring 4 are set to 50, 200, 300, and 500 respectively; the first bending frequencies corresponding to the rotation speeds are obtained. Then, a relationship curve between the rotation speed and the first bending frequency is drawn, so as to estimate the first bending frequency of the rotor at the operating speed.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1. For the dynamic excitation device of high-speed rotating equipment provided by the present invention, by applying excitation to the guide ring through the exciter, the rotor system of the rotating components can be excited under the high-speed operation state of the rotating equipment, and the first bending vibration mode of the rotor can be excited dynamically.

[0028] 2. The usage method of the dynamic excitation device of high-speed rotating equipment provided by the present invention can measure the first bending vibration mode of the rotor at different rotational speeds.

[0029] 3. The application of the practical method of the dynamic excitation device of high-speed rotating equipment provided by the present invention in dynamic excitation testing obtains the phenomenon that the first bending vibration frequency of the rotor increases with the increase of the rotor rotation speed through experiments, which is consistent with the theoretical calculation trend, and verifies the calculation results of the numerical calculation model of the rotor-bearing system. Description of the Drawings

[0030] Figure 1 The following shows the structural schematic diagram of the dynamic excitation device of high-speed rotating equipment.

[0031] In the figure: 1 - flange, 2 - pump body, 3 - cylinder body, 4 - guide ring, 5 - exciter, 6 - threaded hole, 7 - screw. Detailed Embodiments

[0032] The following further elaborates on the present invention in detail in combination with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] Embodiment 1

[0034] A dynamic excitation device for high-speed rotating equipment, as Figure 1 shown, includes a flange 1 fixedly installed on the high-speed rotating equipment, a pump body 2 fixedly connected to the flange, a cylinder body 3 installed below the pump body 2, and a guide ring 4 driven by the high-speed rotating equipment and rotating within the pump body; an exciter 5 is installed inside the pump body 2, and the exciter 5 provides external excitation for the guide ring 4.

[0035] Embodiment 2

[0036] This embodiment introduces its detailed structural information on the basis of Embodiment 1.

[0037] A threaded hole 6 is provided on the side of the pump body 2; the surface of the vibrator 5 is provided with threads, and the vibrator 5 is installed in the threaded hole 6 through the threads. The vibrator 5 is 1 mm away from the lower end face of the flange 1. The working end face of the vibrator 5 is close to the inner wall edge of the pump body 2 and is about 1 mm away from the guide ring 4. The output power and excitation mode of the vibrator 5 can be adjusted by external equipment. When the vibrator 5 works, the output excitation force does not exceed 3 N.

[0038] The upper part of the pump body 2 and the flange 1 are connected by screws 7.

[0039] The lower part of the pump body 2 is in interference connection with the cylinder body 3. The cylinder body 3 is cylindrical and forms an operation protection structure with the pump body 2.

[0040] The guide ring 4 is a circular ring structure made of magnetic material and serves as the object to be excited in this device. The guide ring 4 is located inside the cavity of the pump body 2 and is about 1 mm away from the inner wall of the pump body. Its upper end is close to the edge of the flange 1 and is connected to a high-speed rotating device.

[0041] Embodiment 3

[0042] This embodiment introduces its usage method on the basis of Embodiments 1 and 2.

[0043] The usage method of the dynamic vibration excitation device for the high-speed rotating device includes the following steps:

[0044] S1: Install the vibrator 5 inside the pump body 2; connect the guide ring 4 to the high-speed rotating device and place it in the cavity inside the pump body 2;

[0045] S2: Turn on the high-speed rotating device to drive the guide ring 4 to rotate;

[0046] S3: Turn on the vibrator 5 and set the sweep frequency excitation mode; the electromagnetic force generated by the vibrator 5 excites the guide ring to vibrate along the axial direction of the vibrator.

[0047] S4: Measure the vibration response of the rotor under excitation, judge through the peak value of the FFT transformation, and record the first bending vibration frequency and the corresponding amplitude value of the rotor.

[0048] Embodiment 4

[0049] This embodiment introduces its application in the rotor dynamic vibration excitation test based on Embodiment 3.

[0050] The purpose of the above dynamic excitation device for high-speed rotating equipment is to obtain the actual first bending critical frequency of the rotor through tests. The guide ring 4 is excited by the exciter 5, and then the rotor (the guide ring 4 is connected to the rotor) is excited. When the excitation frequency of the exciter 5 is consistent with the first bending critical frequency of the rotor, the amplitude of the rotor increases and a resonance amplitude is generated. When picking up the vibration signal through the sensor for spectrum analysis, the position of the frequency peak can be observed, and the excitation frequency corresponding to this position is considered as the first bending frequency of the rotor.

[0051] Since the rotor system may cause the divergence of its amplitude after excitation and resonance, resulting in the instability of the rotor system and even the failure of the machine due to explosion. Therefore, the rotational speed of the guide ring 4 in the dynamic test is controlled within 500 r / min, and the output electromagnetic force is less than 3 N.

[0052] There are two methods to obtain the first bending frequency by applying the above dynamic excitation device for high-speed rotating equipment.

[0053] First, by the method of Embodiment 3, the rotational speeds of the guide ring 4 are set to 50 r / min, 200 r / min, 300 r / min, and 500 r / min respectively; the first bending frequencies corresponding to the respective rotational speeds are obtained. Then, a relationship curve between the rotational speed and the first bending frequency is plotted, so as to estimate the first bending frequency of the rotor at the operating speed.

[0054] Second, directly at the operating speed, the first bending frequency is obtained by the method in Embodiment 3.

[0055] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A dynamic excitation device for a high-speed rotating device, Characterized in that: It includes a flange fixedly installed on the high-speed rotating device, a pump body fixedly connected to the flange, a cylinder installed below the pump body, and a guide ring driven by the high-speed rotating device and rotating in the pump body; an exciter is installed in the pump body, and the exciter provides an external excitation for the guide ring.

2. The dynamic excitation device for a high-speed rotating device according to claim 1, Characterized in that: A threaded hole is provided on the side surface of the pump body.

3. The dynamic excitation device for a high-speed rotating device according to claim 2, Characterized in that: Threads are provided on the surface of the exciter, and the exciter is installed in the threaded hole through the threads.

4. The dynamic excitation device for a high-speed rotating device according to claim 1, Characterized in that: The exciter is 1 mm away from the lower end face of the flange.

5. The dynamic excitation device for a high-speed rotating device according to claim 4, Characterized in that: The working end face of the exciter is close to the inner wall edge of the pump body.

6. The dynamic excitation device for a high-speed rotating device according to claim 5, Characterized in that: The working end face of the exciter is 1 mm away from the guide ring.

7. The dynamic excitation device for a high-speed rotating device according to claim 1, Characterized in that: The upper part of the pump body and the flange are connected by screws.

8. The dynamic excitation device for a high-speed rotating device according to claim 7, Characterized in that: The lower part of the pump body is connected to the cylinder by interference fit.

9. A method for using the dynamic excitation device for a high-speed rotating device according to any one of claims 1-8, Characterized in that: It includes the following steps: S1: Install the exciter inside the pump body; connect the guide ring to the high-speed rotating device and place it in the cavity inside the pump body; S2: Turn on the high-speed rotating device to drive the guide ring to rotate; S3: Turn on the exciter and set the frequency sweep excitation mode; the electromagnetic force generated by the exciter excites the guide ring to vibrate along the axial direction of the exciter; S4: Measure the vibration response of the rotor under the excitation, judge through the peak value of the FFT transformation, and record the first bending vibration frequency and the corresponding amplitude of the rotor.

10. The method for using according to claim 9, Characterized in that: In S2, the rotation speed of the guide ring is less than or equal to 500 r / min, and the output electromagnetic force is less than 3 N.

11. The method for using according to claim 10, Characterized in that: The starting frequency of the frequency sweep excitation mode is 1900 Hz; the ending frequency is 2000 Hz.

12. The method for using according to claim 11, Characterized in that: The frequency sweep interval of the frequency sweep excitation mode is 1 Hz.

13. Application of the method for using according to any one of claims 9-12 in dynamic excitation testing.

14. The application according to claim 13, Characterized in that: First, through the method for using according to claims 9-12, set the rotation speeds of the guide ring 4 to 50 r / min, 200 r / min, 300 r / min, and 500 r / min respectively; obtain the first bending frequencies corresponding to the rotation speeds; then draw a relationship curve between the rotation speed and the first bending frequency, so as to estimate the first bending frequency of the rotor at the operating speed.

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