CN103216573A - Method of using radiation heating to restrain vibration of rotor - Google Patents

Abstract

The invention relates to a method for suppressing rotor vibration by using radiant heat to induce local thermal bending deformation of the rotor. It is characterized in that: first determine the unbalanced position of the rotor, and respectively determine the local compression surface and the local tension surface in the unbalanced position of the curved rotor; heat the local compression surface of the unbalanced position during the operation of the rotor system, and use the rotating rotor surface Local absorption of radiant heat, using coating technology, coating radiation-absorbing paint on the local compression surface of the unbalanced position of the rotor to improve the radiant heat absorption rate of the local surface of the coated rotor; when using thermal radiation to heat the rotor, with coating The temperature of the local surface of the coating rises, resulting in a temperature difference with the surface of the uncoated rotor, which causes the rotor to deform, thereby offsetting the original rotor imbalance and suppressing the vibration of the rotor. The purpose of the invention is to suppress the vibration of the rotor system, improve the running stability of the system, and make up for the deficiency of the current vibration suppression technology.

Description

A Method of Suppressing Rotor Vibration Using Radiation Heating

technical field

The present invention relates to a method for suppressing rotor vibration, in particular to a method for suppressing rotor vibration by using radiant heat to induce local thermal bending deformation of the rotor.

Background technique

The vibration problem of rotating machinery is an important factor affecting its stable operation. Various industries have regulations on the vibration of the rotor system, requiring the rotor vibration to be within a certain range during operation. However, rotating machinery will still generate large vibrations due to various reasons during operation, which will affect its operation stability.

At present, the main method of suppressing vibration is dynamic balance, but even if strict dynamic balance is performed on each rotor component, and the installation is well centered, strong vibration may occur during the operation of the composed system, which will make the previous dynamic balance invalid. In addition, vibration control methods also include electromagnetic bearings, controllable squeeze oil film dampers, piezoelectric regulators, shape memory alloy regulators, etc., but in many cases the vibration control technology is not perfect, such as dampers often fail , serious instability problems occur in the supercritical region of the rotor; the electromagnetic control force is relatively small, and the dynamic characteristics are difficult to control.

Contents of the invention

Purpose of the invention: In order to suppress the vibration of the rotor system, improve the operating stability of the system, and make up for the shortcomings of the current vibration suppression technology, the present invention proposes a method of using radiant heat to heat the local surface of the rotor during operation, so that the rotor system generates local heat. deformation to realize the method of suppressing vibration.

Technical side notes: the present invention is achieved through the following technical solutions:

A method for suppressing rotor vibration by radiation heating, characterized in that: firstly, the unbalanced position, size and phase of the rotor are determined by the influence coefficient method of the dynamic balance of the rotor, and the local compression surface and local compression surface in the unbalanced position of the curved rotor are respectively determined Stretch surface; during the operation of the rotor system, the local compression surface of the unbalanced position is heated, and the surface of the rotating rotor is used to locally absorb radiant heat. Coating technology is used to apply radiation-absorbing paint to the local compression surface of the unbalanced position of the rotor to improve The radiative heat absorption rate of the local surface of the coated rotor; when the rotor is heated by thermal radiation, the temperature of the local surface with the coating rises, and the temperature difference between the surface of the uncoated rotor and the deformation of the rotor is offset by the deformation of the rotor The original rotor is unbalanced, suppressing the vibration of the rotor.

Coat the original uncoated surface with a heat-reflecting radiation coating. When the radiation source radiates, under the same radiation structure parameters, a larger temperature difference can be formed locally on the rotor, and the thermal deformation can be accelerated and increased. Counteract the original deformation of the rotor due to unbalance.

This method can solve the vibration problem caused by the unbalance in many places of the rotor, that is, the local compression surface of the unbalanced position of the rotor is coated with radiation-absorbing materials, and other surfaces can also be coated with reflective radiation materials. Radiation irradiation by radiation sources with a wide range or multiple radiation sources with small radiation ranges can cause thermal bending at the local unbalanced position of the rotor, offset the original deformation of the rotor due to unbalance, and suppress the vibration of the rotor.

Advantages and effects: This method can suppress the vibration of the unbalanced rotor without stopping the machine. It is a method of completely suppressing the vibration on-line, which greatly reduces the cost and loss of the machine; Due to the controllability of the radiation, the accuracy of the method is very high, and the effect of suppressing vibration is remarkable, which makes up for the deficiencies in the current field of vibration suppression.

Description of drawings:

Fig. 1 is a principle diagram of radiation heating to suppress rotor vibration in the present invention.

Marked in the figure: 1. Radiation source; 2. Partial coating surface; 3. Rotor.

Implementation method:

The main idea of the present invention is: firstly, the unbalanced position, size and phase of the rotor are determined by the influence coefficient method of the dynamic balance of the rotor, and the local compression surface and the local tensile surface in the unbalanced position of the curved rotor are respectively determined; Heating the local compression surface of the unbalanced position during the process, using the mechanism of local absorption of radiant heat on the surface of the rotating rotor, using coating technology, coating the radiation-absorbing paint on the local compression surface of the unbalanced position of the rotor to improve the radiation of the local surface of the coated rotor Heat absorption rate, when heat radiation is used to heat the rotor, the temperature of the local surface with the coating rises, and a temperature difference occurs with the surface of the uncoated rotor, causing the rotor to deform, thereby offsetting the original rotor imbalance and suppressing Vibration of the rotor.

When the rotor system is in operation, the radiation source generates radiation light, which irradiates on the surface of the rotor shaft section with coating. Due to the rotation of the rotor, the radiation light irradiates on the entire circumferential surface of the rotor shaft section, but the radiation absorption rate of the coated surface is very low. High, the radiation absorption rate of the surface without coating is very low, so after a period of irradiation, the temperature of the surface with coating is much higher than that of other surfaces, resulting in temperature difference, forming thermal bending, and making the local part of the original unbalanced position The compression surface expands when heated, and gradually deforms, which offsets the original deformation caused by imbalance and suppresses the vibration of the rotor.

In addition, in order to further improve the efficiency, the original uncoated surface can also be coated with a reflective heat radiation coating. When the radiation source radiates, under the same radiation structure parameter conditions, the rotor can form a larger temperature locally. Poor, speed up and increase thermal deformation, offset the original deformation of the rotor due to imbalance.

This method can also solve the problem of vibration suppression under the condition of multiple unbalanced rotor vibrations. It can be coated with radiation-absorbing materials on the local compression surfaces of multiple rotor unbalanced positions at the same time, and can also be coated with reflective radiation materials on other surfaces. , using a radiation source with a large radiation range or multiple radiation sources with a small radiation range for radiation irradiation to cause thermal bending at the local unbalanced position of the rotor, offset the original deformation of the rotor due to unbalance, and suppress the vibration of the rotor.

Assume that the unbalanced position of rotor 3 is determined by the influence coefficient method of rotor dynamic balance as the reverse axis position of the position marked 2 in the figure, that is, the reverse axis position of the black part in the figure is the compression position of rotor unbalance. Then use the coating technology to apply the radiation-absorbing paint on the local compression surface of the unbalanced position of the rotor (that is, the partial coating surface 2); then adjust the position of the radiation source 1, and align the radiation source 1 with the position of the partial coating surface 2 The shaft section where the rotor is located begins to run, and the radiation source is turned on, the radiation intensity is adjusted, and the surface of the shaft section of the rotor is heated. After a period of time, the structure-temperature field system of the rotor reaches a steady state, and the coating surface and other surfaces generate temperature. Poor, make the shaft section expand here, produce thermal deformation, offset the original deformation of the rotor due to unbalance, and check the vibration of the rotor to see if the expected effect is achieved. If not, change the structure and radiation parameters, and continue to repeat the above method , until the vibration suppression meets the expected requirements.

The radiation source 1 in the figure can be one or more, and its position can also be adjusted, so this method can solve the vibration problem caused by the unbalance in many parts of the rotor; it is also possible to coat the surface of the white part in the figure with a reflective radiation material , when the radiation source is radiating, under the same radiation structure parameters such as radiation time, range, emissivity, heat transfer rate, radiation spacing, etc., the local unbalanced position of the rotor will quickly generate thermal bending, offsetting the original imbalance of the rotor The resulting deformation suppresses rotor vibration.

Claims (3)

1. method of utilizing radoal heating to suppress rotor oscillation, it is characterized in that: at first utilize the influence coefficient method of rotor dynamic balancing to determine non-equilibrium site, size and the phase place of rotor, and determine partial compression surface and local elongation surface in the crooked rotor unbalance position respectively; The partial compression surface of heating non-equilibrium site in the rotor-support-foundation system running, utilize rotary rotor surface local absorbed radiation heat, adopt cladding technique, absorbed radiation coating is coated in the partial compression surface of rotor unbalance position, to improve the radiation absorptivity of coated rotor local surfaces; When using thermal radiation heating rotor, the local surfaces temperature of coating raises, and produces temperature difference with not cated rotor surface, makes rotor produce distortion, offsets original rotor unbalance with this, suppresses the vibration of rotor.

2. a kind of method of utilizing radoal heating to suppress rotor oscillation according to claim 1, it is characterized in that: the reflective thermal radiation coating is coated on the surface of former not coating, when source of radiation carries out radiation, under the identical irradiation structure parameter condition, can make rotor local form bigger temperature difference, accelerate and the increasing thermal distortion, offset the original distortion of rotor owing to uneven generation.

3. a kind of method of utilizing radoal heating to suppress rotor oscillation according to claim 1, it is characterized in that: this method can solve the rotor many places because of the uneven vibration problem that produces, that is: coat the absorbed radiation material on the partial compression surface of rotor unbalance position, many places, also can coat the reflected radiation material on other surfaces, the source of radiation of a large radiation scope of employing or the source of radiation of a plurality of little radiation scopes carry out radiation exposure makes the rotor local non-equilibrium site produce thermal bending, it is original because the uneven distortion that produces suppresses rotor oscillation to offset rotor.

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