CN100403003C - Method and device for correcting dynamic balance of fan rotor - Google Patents

Abstract

A method and apparatus for correcting the dynamic balance of fan rotor. The invention provides a method and a device for correcting the balance of a rotating member by checking the specification and accurately calculating the balance grade, wherein the method for correcting the balance comprises the steps of placing a standard fan with known unbalance amount and phase angle on a vibration table, and measuring the unbalance vibration vector when the fan rotates; inputting the known unbalance amount and phase angle into the balancing machine to obtain the influence coefficient between the vibration vector and the unbalance vector, so as to transmit the unbalance mass and the phase angle of the standard fan to the balancing machine; measuring the unbalanced weight and phase angle of the fan to be measured according to the mass and phase angle of the standard fan; calculating a balance grade; the correction device comprises a balance analyzer, an input structure, a vibration table, a vibration sensor and an electronic switch.

Description

Fan rotor dynamic balance correction method and device

technical field

The invention belongs to a method and a device for correcting the balance of a rotating part, in particular to a method and a device for correcting the dynamic balance of a fan rotor.

Background technique

In the conventional fan manufacturing process, due to impossibility of perfect homogeneity of materials, limitation of manufacturing precision, unbalance and other factors, the fan will vibrate when it rotates. In particular, the weight distribution of the fan blades is not uniform, so that the center of gravity of the fan cannot coincide with the center of rotation of the fan, resulting in disadvantages of imbalance or vibration during rotation. When rotating, the centrifugal force caused by the uneven weight distribution will generate vibration in the radial and axial directions of the fan, which will reduce the precision and reliability of the fan and generate noise . Therefore, in the manufacture of fans, the dynamic balancing of the fan blade rotor is listed as a necessary work in the process by most fan manufacturers. For example, the impeller after injection molding and the fan blade (rotor) after installing the magnetic strip need to be dynamically balanced.

The dynamic balance correction method generally uses a dynamic balance correction machine with a vibration sensor and a phase meter to measure the vibration signal of the fan when it rotates. The vibration signal includes the vibration of the fan, such as the amplitude (displacement), the vibration speed, Acceleration, phase and frequency of unbalanced quantity, etc. are measured by the phase influence coefficient method or the standard part unbalanced transfer method to measure the size and position of the unbalanced mass of the fan rotor. Afterwards, refer to the inspection standard to reduce the unbalanced mass or increase the unbalanced mass at its symmetrical point to meet the requirements of the inspection standard.

However, at different rotational speeds, the amount of vibration measured is not the same, and the inspection standard of this conventional method is only determined by each manufacturer in a statistical manner, and does not provide a common inspection or evaluation standard. The dynamic balance detection of the fan involves many complicated parameters, such as the size and weight of the fan, the size of the fan blade, the unbalanced mass and position, and the working speed and so on. Even for fans of the same type, it is difficult to use a single measurement value to determine whether the fan is good or bad. However, there is no suitable method or device for easily measuring or evaluating the fan quality in the prior art.

In addition, another detection method provided by the fan manufacturer is to judge the vibration of the fan by finger feeling. This measurement method can not only sense the radial vibration of the fan, but also sense the fan shaft To (axial) vibration. However, the accelerometers or speed gauges provided in the prior art are all used to measure radial momentum instead of axial momentum. Therefore, the process of manual measurement cannot be completely replaced, so that the finger feels that the vibration in the radial direction is not good and the fan with a well-balanced diameter passes through the tube detection.

In view of this, it is necessary to provide a fan rotor dynamic balance correction method and device, which can measure radial and axial vibrations at the same time, and can perform dynamic balance measurement and correction under a common inspection standard.

Contents of the invention

The purpose of the present invention is to provide a method and device for correcting dynamic balance of a fan rotor with inspection standards and accurate calculation of balance grades.

The correction method of the present invention includes placing a standard fan (or fan to be tested) with known unbalance and phase angle on a vibrating table, and measuring the unbalance vibration vector when it rotates; Input the angle into the balancing machine to obtain the influence coefficient between the vibration vector and the unbalanced vector, so as to transfer the unbalanced mass and phase angle of the standard fan to the balancing machine to complete the function of transferring standard parts; through the mass of the standard fan and phase angle, (or put a test weight of known weight on a specific position of the fan to be tested, and measure the unbalanced vibration vector when it is combined with the test weight and rotate) to measure the unbalanced weight and phase angle of the fan to be tested ; Calculating the balance level; the correction device of the present invention includes a balance analyzer for collecting and analyzing vibration signals, an input structure for the user to input condition parameters, a vibrating table for relatively fixing the fan on its specific position, and a vibration table for After the measurement, the radial and axial vibrations of the fan are transmitted to the vibration sensor of the balance analyzer, placed above the vibration table and electrically connected to the electronic switch of the balance analyzer; the electronic switch is used to transfer the measured fan speed and phase sent to the balance analyzer.

in:

The calibration method also includes calculating the size and position of the increased/decreased mass of the fan under test, so as to make the fan under test meet a predetermined balance level.

The calibration method also includes calculating the size and position of the increased/decreased mass required for the fan under test to meet the predetermined balance standard, and making the fan under test meet the predetermined balance level by increasing/decreasing the mass of the fan under test.

The photoelectric switch is an optical fiber photoelectric switch.

The balance analyzer collects and analyzes the radial and axial vibrations, and calculates the size and position of the increased/decreased mass required for the fan to be tested to meet the predetermined balance standard. By increasing/decreasing the mass of the fan to be tested, Bring the fan under test to a predetermined balance level.

The balance grade system is the ISO1940 balance quality grade.

Because the correction method of the present invention includes placing a standard fan with known unbalance and phase angle on a vibrating table, measuring the unbalance vibration vector when it rotates; inputting the known unbalance and phase angle into the balancing machine to obtain The influence coefficient between the vibration vector and the unbalance vector, so as to transmit the unbalanced mass and phase angle of the standard fan to the balancing machine; through the mass and phase angle of the standard fan, measure the unbalanced mass and phase angle of the fan to be tested angle; calculate the balance level; the correction device of the present invention includes a balance analyzer, an input structure, a vibration table, a vibration sensor and an electronic switch. Use the balance analyzer of the present invention to measure the axial and radial vibrations of the fan or rotating parts using the phase influence coefficient method or the standard part unbalanced transfer method, so as to measure the eccentric moment of the fan or rotating parts; after that, refer to the balance quality Level, so as to judge the vibration level of the fan or rotating parts; therefore, the present invention can save the operation steps of dynamic balance, improve work efficiency, and through the specification of rotor dynamic balance, unify the identification of the quality of the fan in the fan manufacturing industry , eliminate disputes; not only test norms, but also accurately calculate the balance level, so as to achieve the purpose of the present invention.

Description of drawings

Fig. 1 is a schematic top view of the structure of the fan rotor dynamic balance correction device of the present invention.

Fig. 2 is a schematic side view of the structure of the fan rotor dynamic balance correction device of the present invention.

Detailed ways

As shown in Figures 1 and 2, the fan rotor dynamic balance correction device 10 of the present invention includes a balance analyzer 20 for collecting and analyzing vibration signals, an input structure for the user to input condition parameters, and is used to relatively fix the fan 5 on the The vibration table 30 on its specific position, the vibration sensor 40 used to transmit the radial (radial) and axial (axial) vibration of the rear fan to the balance analyzer 20 after measurement, is fixed on the vibration table 30 for the fan 5 The vibration on the vibrating table 30 is transmitted to the spring plate 35 of the vibration sensor 40, and the electronic switch 50 used to transmit the measured rotational speed and phase of the fan 5 to the balance analyzer 20 is placed behind the vibrating table 30 to The electronic switch 50 is sent to the pneumatic cylinder at the measuring position and the output structure for outputting the analyzed result of the balance analyzer 20 .

The electronic switch 50 is placed above the vibration table 30 and electrically connected to the balance analyzer 20 .

Those who are proficient in this technical field can understand that the electronic switch 50 can be a fiber optic photoelectric switch, a relay coupler switch (relay coupler) and so on.

The method for correcting the dynamic balance of the fan rotor of the present invention is that the inspector first fixes the fan 5 to be tested on the vibration table 30, and then inputs the condition parameters of the fan 6. The condition parameters are operating parameters, which include rotor weight M, working Speed ω, balance radius r and detection standard parameters. Test standard parameters such as allowable rotor balance grade (ie ISO1940 balance quality grade; ISO1940 Balancing Quality Grade; expressed in G) and allowable axial vibration.

After the inspector presses the start button, the fan 5 starts to rotate, and the electronic switch 50 also starts to measure the rotation speed of the fan 5 at the same time. When the operating speed is reached, the vibration sensor 40 will measure the vibration of the fan 5, and the electronic switch 50 will measure the phase of the unbalance.

The fan rotor dynamic balance correction method of the present invention is as follows: the fan rotor dynamic balance correction device 10 of the present invention uses the vibration sensor 40 to measure the vibration amount, and in addition, the electronic switch 50 is used to cooperate with the reference point on the fan 5 as a phase reference phase meter. When the reference point of the fan 5 passes through the electronic switch 50, the PB230 balancing machine is triggered to take a sample. In this way, the vibration waveform obtained by passing the reference point once in a circle has a phase relationship, and this e is the vibration vector. Afterwards, when a test weight of known weight is added to a specific position of the fan 5, the fan 5 is rotated to the same speed, thereby obtaining a synthesized unbalanced vibration synthesized signal. At this time, the computer will use the parallelogram method to derive the fan from the original vibration vector and another vibration vector caused by adding the known weight of the test weight, referring to the weight of the known weight of the test weight 5 unbalanced weights and corresponding angles. That is to calculate the size and position of the increase/decrease mass required for the fan 5 to be tested to meet the predetermined balance standard, and to make the fan 5 to be tested meet the predetermined ISO1940 balance quality level by increasing/decreasing the mass of the fan 5 to be tested.

The steps of another embodiment of the fan rotor dynamic balance correction method of the present invention are as follows:

Utilize a standard fan (Reference fan) with known unbalance and phase angle, place it on the vibrating table 30, and measure the unbalanced vibration vector when it rotates;

Then input the known unbalance and phase angle of the standard fan into the PB210M balancing machine to obtain the influence coefficient between the vibration vector and the unbalance vector, and transfer the quality and phase angle of the standard fan to the balancing machine. Complete the function of standard part delivery;

The fan 5 to be tested can only know its unbalanced weight and corresponding angle through a single test step, without the need for the second known weight measurement process of the previous step; by the standard fan Mass and phase angle, measure the unbalanced weight and phase angle of the fan to be tested.

At this time, the balance analyzer will calculate the ISO1940 balance quality grade of the fan 5 to be tested according to the previously input rotor weight and operating speed.

G (rotor balance level) = e (rotor eccentricity) × ω (speed);

e (rotor eccentricity) = U (residual unbalance) / M (rotor mass)

Thereby, the residual unbalanced mass and the unbalanced angle correction angle of the fan 5 are obtained. In addition, according to the relationship between the input balance radius and U=m×r, the deletion quality is calculated. If the balance level of the fan 5 is lower than the required level (the lower the G value, the higher the balance quality level), then calculate the corrected angle and weight, and the operator can achieve the ISO1940 balance required by the industry as long as the operator balances according to the instructions. quality grade. That is to say, the balance analyzer 20 will output that the fan needs to increase or decrease the mass at a certain radial or relative position of the fan 5, so as to meet the requirement of the balance level. Afterwards, the above steps can be repeated to confirm whether the fan 5 meets the prescribed balance standard.

In addition, the balance analyzer 20 can also display the axial vibration measured by the vibrating table 30 , which can replace the step of manually measuring the radial vibration in the prior art. Therefore, the dynamic balance correction device 10 of the present invention can provide scientific and standardized operating procedures.

To sum up, the balance analyzer 20 of the present invention measures the axial and radial vibrations of the fan or rotating parts by using the phase influence coefficient method or the unbalanced transfer method of standard parts, so as to measure the eccentric moment of the fan 5 or the rotating parts . Afterwards, reference is made to the ISO1940 balance quality level as a standard for judging the vibration level of the fan 5 or rotating parts. Therefore, the present invention can save the operation steps of dynamic balancing, improve work efficiency, and use the specification of ISO1940 rotor dynamic balancing to unify the fan manufacturing industry's determination of whether the fan is good or bad, and eliminate disputes.

Claims (10)

1. a fan rotor dynamic balance calibrating method is characterized in that it comprises the following steps:

The standard fan of a known amount of unbalance and phase angle is placed shaking table, the unbalance vibration vector when measuring its rotation;

In the known amount of unbalance of standard fan and phase angle input equilibrator, try to achieve the influence coefficient between moments of vibration and uneven vector, by this, the unbalance mass, and the phase angle of standard fan is passed to equilibrator, finish the function that standard component transmits;

By the quality and the phase angle of standard fan, measure uneven weight, the phase angle of fan to be measured;

The calculated equilibrium grade.

2. fan rotor dynamic balance calibrating method according to claim 1 is characterized in that it comprises that also calculating fan to be measured increases/subtract the size and the position of quality, uses fan to be measured is closed in predetermined balance level.

3. fan rotor dynamic balance calibrating method according to claim 1 is characterized in that described balance level is an ISO1940 balance quality grade.

4. a fan rotor dynamic balance calibrating method is characterized in that it comprises the following steps:

Fan to be measured is placed fixer for electric fan, and measure its unbalance vibration vector when rotating;

The test mass of known weight on the ad-hoc location of fan to be measured, and is measured itself and test mass unbalance vibration vector when merging the back and rotating;

Calculate the unbalanced weight and the corresponding angle of fan to be measured;

The calculated equilibrium grade.

5. fan rotor dynamic balance calibrating method according to claim 4, it is characterized in that it comprises that also calculating fan to be measured closes in predetermined required the increasing of tension metrics/the subtract size and the position of quality, by the quality that increases/subtract fan to be measured, fan to be measured is closed in predetermined balance level.

6. fan rotor dynamic balance calibrating method according to claim 4 is characterized in that described balance level is an ISO1940 balance quality grade.

7. fan rotor dynamic balance means for correcting is characterized in that it comprises in order to the equilibrium analysis instrument of collecting and analyze the vibration signal, for the input structure of user's initial conditions parameter, in order to the vibration transducer that is sent to the equilibrium analysis instrument with the shaking table of fan relative fixed on its ad-hoc location, in order to the axial vibration amount that radially reaches that will measure aft-fan, places above the shaking table and be electrically connected to the electronic switch of equilibrium analysis instrument; Electronic switch is sent to the equilibrium analysis instrument in order to rotation speed of the fan after will measuring and phase place.

8. fan rotor dynamic balance means for correcting according to claim 7 is characterized in that described optoelectronic switch is an optical fiber photoelectric switch.

9. fan rotor dynamic balance means for correcting according to claim 7, it is characterized in that described equilibrium analysis instrument is by collecting and analyze the axial vibration amount that radially reaches, calculating fan to be measured closes in predetermined required the increasing of tension metrics/the subtract size and location of quality, by the quality that increases/subtract fan to be measured, fan to be measured is closed in predetermined balance level.

10. fan rotor dynamic balance means for correcting according to claim 9 is characterized in that described balance level is an ISO1940 balance quality grade.

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