阅读说明：本技术 旋转设备的动平衡实现方法 (Dynamic balance implementation method of rotating equipment ) 是由 王春 耿清华 隆元林 李贵吉 王亮 罗小晶 陈凯 叶喻萍 于 2021-05-07 设计创作，主要内容包括：本申请涉及一种旋转设备的动平衡实现方法,该方法包括：对旋转设备的机组进行第一次配重,并根据在所述第一次配重前后机组的摆振数据确定机组失重点的滞后角；根据所述滞后角和在所述第一次配重后机组的摆振数据,确定所述机组的当前失重点,并根据所述当前失重点进行第二次配重。本申请仅通过两次配重就使机组实现了动平衡,可有效降低机组的不平衡质量力,大大减少了因试验人员不能准确找到机组失重点而反复进行机组动平衡试验的次数,减少了所花费的时间。而且,由于本申请考虑到不平衡质量力传递过程中机组失重点会发生变化,因此利用滞后角对失重点进行调整,提高了机组失重点的准确率,从而大大提高了动平衡的准确性。(The application relates to a dynamic balance implementation method of rotating equipment, which comprises the following steps: carrying out primary counterweight on a unit of rotary equipment, and determining a lag angle of a unit key losing point according to shimmy data of the unit before and after the primary counterweight; and determining the current weightlessness point of the unit according to the lag angle and the shimmy data of the unit after the first counterweight, and performing second counterweight according to the current weightlessness point. This application just makes the unit realize dynamic balance through twice counter weights, can effectively reduce the unbalanced mass power of unit, greatly reduced because of the experimenter can not accurately find the unit and lose focus and carry out the number of times that the unit dynamic balance was tested repeatedly, reduced the time spent. In addition, the loss point of the unit is changed in the unbalanced mass force transmission process, so that the loss point is adjusted by utilizing the lag angle, the accuracy rate of the loss point of the unit is improved, and the accuracy of dynamic balance is greatly improved.)

1. A dynamic balance implementation method of a rotating device is characterized by comprising the following steps:

carrying out primary counterweight on a set of rotating equipment, and determining a lag angle of a set point of unbalance according to shimmy data of the set before and after the primary counterweight, wherein the lag angle is a rotating angle of the set point of unbalance in the process of transmitting the unbalanced mass force;

and determining the current weightlessness point of the unit according to the lag angle and the shimmy data of the unit after the first counterweight, and performing second counterweight according to the current weightlessness point.

2. The method of claim 1, wherein determining lag angles of unit de-emphasis points from shimmy data of the unit before and after the first counterweight comprises:

determining the shimmy change of the unit caused by the first counterweight according to shimmy data of the unit before and after the first counterweight;

and determining the lag angle according to the shimmy change and the position of the balancing weight used for balancing for the first time.

3. The method of claim 2, wherein determining the shimmy change of the unit caused by the first counterweight based on the shimmy data of the unit before and after the first counterweight comprises:

determining a first vector corresponding to shimmy data of the machine set before the first time of counterweight and a second vector corresponding to shimmy data of the machine set after the first time of counterweight in a coordinate system;

and performing vector subtraction on the second vector and the first vector to obtain a third vector corresponding to shimmy change caused by the first counterweight.

4. The method of claim 3, wherein determining the lag angle based on the lag variation and a position of a weight used for first weighting comprises:

determining a fourth vector corresponding to the position of the balancing weight used by the first time of balancing weight in the coordinate system;

translating the third vector so that the starting point of the third vector is located at the origin of the coordinate system;

and taking an included angle between the translated third vector and the translated fourth vector as the lag angle.

5. The method of claim 4, wherein said determining a current point of imbalance of the unit based on the lag angle and the shimmy data of the unit after the first weighting comprises:

and in the coordinate system, clockwise rotating the second vector by the lag angle to obtain a fifth vector, and taking the end point of the fifth vector as the current point of imbalance.

6. A method according to any one of claims 1 to 5, wherein the shimmy data comprises the shimmy amplitude and phase of the unit bearings.

Technical Field

The application relates to the technical field of dynamic balance, in particular to a dynamic balance implementation method of rotating equipment.

Background

In the production and installation processes of large-sized rotating machinery (such as a water turbine generator set), because rotating parts cannot be perfectly balanced, the rotating center is deviated from the mass center, the unit generates eccentric mass force during operation, the larger the mass is, the larger the eccentric mass force of the unit at higher rotating speed is, and therefore a dynamic balance test is required to reduce the unbalanced mass force of the unit.

The current dynamic balance test is a four-time counterweight method, and generally, the counterweight test is carried out through the first three times, and the accurate counterweight is carried out through calculation for the fourth time. The specific scheme is as follows: the key phase sensor is installed, the key phase block is installed on the rotating component, the phase difference between the key phase block and the point of unbalance (namely the maximum point of the gap between the bearing of the unit and the swing sensor) is measured when the unit swings, the point of unbalance is found according to the key phase block and the phase difference when the unit is stopped, and the counter weight with proper weight is added to the point of weightlessness, so that the purpose of offsetting unbalanced mass force is achieved.

This kind of scheme needs 4 counter weights, and the counter weight number of times is more, need to shut down many times and weld the balancing weight, and operating time is long. In the scheme, the maximum point of a gap between a throw sensor and a bearing of the unit is used as a unit weightless point to perform balance weight calculation, the condition that unbalanced mass force is generated from a rotor and is transmitted to a shafting to cause shafting bending is not fully considered, time is needed for transmitting the unbalanced mass force from the shafting to a sensor measuring position, the time is not instantaneous, when the unbalanced mass force causes deformation bending to be transmitted to the throw sensor or a frame, the unbalanced mass point of the rotor of the unit is not in the original position, but rotates by a certain angle, and the higher the rotating speed of the unit is, the larger the angle difference is (namely, the lag angle). Because the influence of the lag angle on the dynamic balance of the unit is not considered, the unit key point is difficult to accurately find.

Disclosure of Invention

In order to solve the above technical problem or at least partially solve the above technical problem, the present application provides a dynamic balance implementation method of a rotating device.

The application provides a dynamic balance implementation method of rotating equipment, which comprises the following steps:

carrying out primary counterweight on a set of rotating equipment, and determining a lag angle of a set point of unbalance according to shimmy data of the set before and after the primary counterweight, wherein the lag angle is a rotating angle of the set point of unbalance in the process of transmitting the unbalanced mass force;

and determining the current weightlessness point of the unit according to the lag angle and the shimmy data of the unit after the first counterweight, and performing second counterweight according to the current weightlessness point.

According to the dynamic balance implementation method of the rotating equipment, after the first counterweight, the rotation angle of the unit imbalance point in the unbalanced mass force transmission process, namely the lag angle, is calculated, then the actual imbalance point of the unit, namely the current imbalance point, is determined according to the lag angle, and then the second counterweight is performed according to the current weightlessness point. Therefore, the first counter weight is a trial counter weight, the second counter weight is an accurate counter weight, the dynamic balance of the unit is realized only by twice counter weights, the unbalanced mass force of the unit can be effectively reduced, the times of repeated dynamic balance tests (namely the times of the counter weights) of the unit due to the fact that testers cannot accurately find the key points of the unit are greatly reduced, and the time spent is reduced. In addition, the loss point of the unit is changed in the unbalanced mass force transmission process, so that the loss point is adjusted by utilizing the lag angle, the accuracy rate of the loss point of the unit is improved, and the accuracy of dynamic balance is greatly improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic flow chart of a dynamic balance implementation method of a rotating device provided in the present application;

FIG. 2 is a schematic diagram of various vectors in a coordinate system provided herein;

reference numerals: a first vector-1; a second vector-2; third vector before translation-31; translated third vector-32; a fourth vector of-4; fifth vector-5; lag angle-r.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The application provides a dynamic balance implementation method of a rotating device, as shown in fig. 1, the method comprises the following steps:

s110, carrying out primary counterweight on a set of rotating equipment, and determining a lag angle of a set point of unbalance according to shimmy data of the set before and after the primary counterweight, wherein the lag angle is a rotating angle of the set point of unbalance in the process of transmitting the unbalanced mass force;

wherein the rotating equipment may comprise a hydro-turbo set or other large rotating mechanical equipment.

The shimmy data may include the shimmy amplitude and phase of the unit bearing.

In specific implementation, the acquisition mode of the shimmy data may be: a shimmy tester is arranged on a rotor (namely a mass center) of the unit, a shimmy sensor is arranged on a stator, and the amplitude and the phase of the shimmy of the unit are obtained through the shimmy tester and the shimmy sensor.

It can be understood that before the first counterweight, the shimmy data of the maximum point of the gap between the unit bearing and the shimmy sensor is used as the shimmy data of the unit before and after the first counterweight in the swinging process of the unit bearing. And after the first counterweight, similarly taking the shimmy data of the maximum point of the gap between the bearing of the unit and the shimmy sensor as the shimmy data of the unit after the first counterweight. After the first counterweight, both the unit throw amplitude and phase may change.

The balance weight used for balancing for the first time can also be called a trial balance weight, the mass of the balance weight can be two ten-thousandth of the mass of a rotor, the arrangement position of the trial balance weight can be the maximum distance position between a swing sensor and a unit bearing detected by a swing tester, the phase difference between the trial balance weight and a key phase block can be calculated by the swing tester, and the specific position can be determined according to the position and the phase difference of the key phase block when the unit stops.

The unbalanced mass force refers to an eccentric mass force generated by deviation between a rotation center and a mass point in a rotation process of the rotating equipment after the rotating equipment is subjected to first counter weight.

It can be understood that after the first counterweight, the maximum point of the gap between the bearing of the unit and the throw sensor after counterweight is taken as the current unit key point. After the first counterweight, in the rotating process, eccentric mass force is generated from the rotor and is transmitted to the bearing to cause the bearing to bend, and then is transmitted to the swing sensor from the bearing, a certain time is needed in the transmitting process, when the eccentric mass force is transmitted to the swing sensor, the imbalance point of the unit is not in the original position, but is rotated by a certain angle, and the rotating angle is the rotating angle of the imbalance point of the unit in the transmitting process of the imbalance mass force, namely the lag angle.

In a specific implementation, the step of determining the lag angle of the unit imbalance point according to the shimmy data of the unit before and after the first balancing in S110 may include:

s111, determining the shimmy change of the unit caused by the primary counterweight according to shimmy data of the unit before and after the primary counterweight;

it will be appreciated that since the lag data may include both the lag magnitude and phase, the lag variation may include both the amount of change in the lag magnitude and the amount of change in the phase.

In a specific implementation, in order to quantify the shimmy variation, a coordinate system may be used, so that S111 may specifically include:

s111a, determining a first vector corresponding to shimmy data of the primary pre-counterweight unit and a second vector corresponding to shimmy data of the primary post-counterweight unit in a coordinate system;

as shown in fig. 2, in the figure, a first vector 1 is used to represent the swing amplitude and phase of the primary counterweight front unit, and a second vector 2 is used to represent the swing amplitude and phase of the primary counterweight rear unit.

And S111b, performing vector subtraction on the second vector and the first vector to obtain a third vector corresponding to the shimmy change caused by the first counterweight.

For example, in fig. 2, the second vector 2 is subtracted from the first vector 1 to obtain a third vector 31, and the third vector 31 represents the shimmy change caused by the first counterweight.

And S112, determining the lag angle according to the shimmy change and the position of the balancing weight used for balancing for the first time.

In an implementation, based on the coordinate system in fig. 2, S112 may specifically include:

s112a, determining a fourth vector 4 corresponding to the position of the balancing weight used by the first time of balancing weight in the coordinate system; translating the third vector 31 so that the starting point of the translated third vector 32 is located at the origin of the coordinate system;

it can be understood that the position of the counterweight used for the first counterweight is the position of the counterweight relative to the center of mass of the unit, the origin of the coordinate system represents the center of mass of the unit, and the position of the counterweight relative to the center of mass of the unit is mapped into the coordinate system to obtain a fourth vector. The length of the fourth vector represents the distance of the balancing weight used for the first time of balancing relative to the mass center of the machine set, and the direction of the fourth vector represents the direction of the balancing weight used for the first time of balancing relative to the mass center of the machine set.

It will be appreciated that the third vector is translated for subsequent ease of determining the home angle of the two.

S112b, and setting an angle r between the translated third vector 32 and the fourth vector 4 as the lag angle.

Here, the angle between the translated third vector 32 and the fourth vector 4 is taken as the lag angle because: the third vector 32 is the vector influence of the first added balancing weight on the vibration, the fourth vector 4 is the position of the balancing weight used for the first balancing weight, the third vector and the fourth vector should coincide without considering the ideal condition of the lag angle, but the vector influence of the balancing weight on the vibration of the unit is not in the direction of the balancing weight due to the lag angle, and therefore the included angle between the third vector and the fourth vector is the lag angle.

And S120, determining a current weightlessness point of the unit according to the lag angle and the shimmy data of the unit after the first counterweight, and performing second counterweight according to the current imbalance point.

In a specific implementation, the specific process of determining the current imbalance point of the unit according to the lag angle and the shimmy data of the unit after the first balancing in S120 includes:

in the coordinate system shown in fig. 2, the second vector 2 is rotated clockwise by the retard angle r to obtain a fifth vector 5, and an end point of the fifth vector is taken as the current point of imbalance.

It can be understood that the second vector is the unit imbalance point when the unbalanced mass force is not transferred to the throw sensor after the first counterweight. And after the unbalanced mass force is transmitted to the unit weight losing point of the swing sensor, the unit weight losing point rotates by a lag angle to obtain a fifth vector.

It can be understood that the current weight loss point is the point of imbalance mass force transferred to the unit after the swing sensor.

It can be understood that the lag angle is rotated at the dead center of the unit, only the phase is changed, and the amplitude is not changed.

After the current point of weakness is obtained, the balancing weight with proper mass is selected, and the balancing weight is arranged at the mapping position of the terminal point of the fifth vector on the unit, so that the unbalanced mass force of the unit can be effectively eliminated, and dynamic balance is realized.

In specific implementation, the influence coefficient of the mass of the balancing weight on the runout amplitude of the unit can be calculated according to the proportional relation between the size of the third vector 31 and the balancing weight used for the first balancing weight, and the mass of the balancing weight used for the second balancing weight can be calculated according to the size and the influence coefficient of the second vector 2.

It is understood that the above mass is weight.

The application provides a dynamic balance implementation method of rotating equipment, after the first counterweight, the rotating angle of the unit key point, namely the lag angle, in the unbalanced mass force transmission process is calculated, then the actual key point of the unit, namely the current key point, is determined according to the lag angle, and then the second counterweight is carried out according to the current weightless point so as to implement dynamic balance. It can be seen that the first counter weight is a trial counter weight, the second counter weight is an accurate counter weight, the dynamic balance of the unit can be realized only by twice counter weights, the unbalanced mass force of the unit can be effectively reduced, the times (namely the times of the counter weights) of the unit dynamic balance test which is repeatedly carried out due to the fact that testers cannot accurately find the key points of the unit are greatly reduced, and the time spent is reduced. In addition, the loss point of the unit is changed in the unbalanced mass force transmission process, so that the loss point is adjusted by utilizing the lag angle, the accuracy rate of the loss point of the unit is improved, and the accuracy of dynamic balance is greatly improved.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.