Method for reducing the imbalance of a rotating component for an electric pump, balancing machine, computer program, computer-readable medium and rotating component for the method

Abstract

Method for reducing the imbalance of a rotating component for an electric pump, balancing machine, computer program, computer-readable medium and rotating component for the method The invention relates to a method for reducing the imbalance of a rotating component (1) for an electric pump. The method comprises material removal using laser radiation (3) and associated material removal rates selected such that the resulting imbalance of the rotating component (2) after material removal is below a threshold value. The invention further relates to a balancing machine (1), a computer program (7), and a computer-readable medium (6).

Description

[0001] Method for reducing an unbalance of a rotating component for an electric pump, balancing machine, computer program, computer-readable medium and rotating component for the method Technical area

[0002] The invention relates to a method for reducing an unbalance of a rotating component for an electric pump, a balancing machine, a computer program and a computer-readable medium.

[0003] An imbalance in a rotating component can cause damage to pumps. Such imbalance can also lead to acoustic disturbances. Therefore, reducing the imbalance is crucial. State of the art

[0004] The documents DE 10 2014 103 060 A1 and EP 0 922 208 A1 relate to a method and a device for balancing rotors.

[0005] The publications DE 10 2016 106 676 A1 and DE 199 10 276 A1 concern balancing procedures.

[0006] A particular disadvantage of the prior art devices is the long duration of a balancing process. Description of the invention, task, solution, advantages

[0007] Therefore, the object of the present invention is to provide an alternative method for reducing an imbalance of a rotating component for an electric pump, which is characterized in particular by its short duration. A further object is to provide a balancing machine configured to carry out this method. A further object is to provide a computer program for carrying out the method. A further object is to provide a computer-readable medium with the computer program. A further object is to provide a rotating component for the method according to the invention.

[0008] The problem with regard to the method is solved by a method having the features of claim 1.

[0009] This creates a process that differs from prior art methods in its extremely short duration. This is primarily due to the fact that the required number and size of the individual material removals are determined before the material removal process begins.

[0010] Preferably, the individual material removals and / or the material removal form circular segment-shaped or ring segment-shaped recesses on the rotary component.

[0011] It is particularly advantageous if the laser radiation comprises at least one laser beam. The laser radiation or laser beam is preferably generated by a laser source, such as a laser diode.

[0012] It is also advantageous if the imbalance of the rotating component is determined using a balancing machine. The balancing machine preferably has a dedicated sensor system for this purpose. For example, the imbalance is determined by setting the rotating component in rotation and using the sensor system to measure a radial force resulting from the imbalance, from which the imbalance can be determined.

[0013] The fact that the unbalance corresponds to at least one threshold value is preferably to be understood in such a way that one or the size of the unbalance corresponds to at least the threshold value.

[0014] Furthermore, it is preferred if the number of individual material removals and their material removal sizes are determined before the, in particular associated, reduction of the unbalance.

[0015] It is particularly advantageous to use an algorithm and / or artificial intelligence to determine the number of individual material removal steps and their respective material removal sizes. This allows this process step to be automated.

[0016] Furthermore, it is advantageous if the number of individual material removals and their material removal sizes are determined on the basis of previous balancing data.

[0017] Preferably, the method steps which do not require specific means for their execution are computer-implemented method steps.

[0018] In general, it is preferable if one or the unbalance reduction variable(s) is understood to be a variable that represents a measure of the reduction in unbalance. In other words, the greater the one or the unbalance reduction variable(s), the greater the reduction in unbalance.

[0019] Furthermore, it is expedient if the rotating component for the electric pump is a rotor or a pump impeller. Furthermore, it is expedient if the rotating component of the electric pump is a rotor-pump impeller unit. Regardless of the design of the rotating component, it is generally preferred if the rotating component comprises plastic or is at least partially made of plastic. It is particularly preferred if the rotating component comprises plastic at the points where the material is removed, or if the rotating component is made of plastic at least at these points.The plastic is preferably a plastic that is matched to the laser radiation or the at least one laser beam, in particular such that the laser radiation or the at least one laser beam generates or carries out material removal upon impact with the plastic. Alternatively, it is conceivable for the rotating component to be made of brass, although this would require a higher energy expenditure for the individual material removal and / or the laser and / or the laser beam than for a rotating component made of plastic.

[0020] Preferably, the rotating component is designed such that it comprises a material accumulation and / or material accumulations, in particular made of plastic or brass, which are designed and / or provided to enable the reduction of the imbalance by means of material removal on the rotating component. In other words, specific locations are provided on the rotating component where the material removal and / or individual material removals can be performed to reduce the imbalance.

[0021] A preferred embodiment is characterized in that the individual material removals take place at least partially simultaneously or successively.

[0022] Simultaneous material removal can further save time. Preferably, multiple individual material removals are performed using at least one laser beam each. The laser source preferably comprises one laser diode for each individual material removal, which is performed simultaneously.

[0023] In cases where the laser source is only capable of generating a single laser beam, it is advantageous if no further determination of the unbalance of the rotating component is performed between successive material removals. This saves time. The goal is to reduce the time required to achieve a threshold value, which is avoided by eliminating intermediate measurements to determine the residual unbalance after each individual material removal.

[0024] A further preferred embodiment is characterized in that after the reduction of the unbalance, the resulting unbalance of the rotating component is determined, wherein the method is repeated if, after the reduction of the unbalance, the resulting unbalance of the rotating component corresponds at least to the threshold value, and / or the method is terminated if, after the reduction of the unbalance, the resulting unbalance of the rotating component is below the threshold value.

[0025] By repeating the procedure, it is ensured that the unbalance is reduced to below the threshold value.

[0026] Time is saved by terminating the process when it is determined that the unbalance has already been reduced to a size that meets the requirements of the rotating component in its field of application.

[0027] The method further comprises the step: - Correcting the standardized material removal quantities if the resulting unbalance of the rotating component after the material removal deviates from a value that is different from the unbalance less the unbalance reduction quantities of the individual material removals carried out, which result from the material removal.

[0028] By correcting the standardized material removal sizes, the accuracy of the process is increased or the device used to perform the process is automatically readjusted.

[0029] It is particularly advantageous to use an algorithm and / or artificial intelligence to evaluate the deviation between the resulting unbalance of the rotating component after material removal and the value resulting from the unbalance minus the unbalance reduction values ​​of the individual material removals performed. This allows this process step to be automated.

[0030] Furthermore, it is advantageous if the correction and / or evaluation is carried out on the basis of previous balancing data.

[0031] A further preferred embodiment is characterized in that the material removal quantities differ from one another in their shape and / or in their distance from the rotation axis of the rotating component and / or in their dimensions.

[0032] This allows us to accommodate differently designed rotational component variants.

[0033] A further preferred embodiment is characterized in that the determination of the necessary number of individual material removals and / or the material removal sizes takes place as a function of the material removal duration and / or the difference between the unbalance and the threshold value, i.e. in particular the intended reduction of the unbalance.

[0034] If, for example, the requirement is to ensure the lowest possible unbalance, a larger number of individual material removal operations with different standardized material removal sizes will most likely be necessary. The number and the standardized material removal sizes are selected such that the unbalance successively approaches zero after each individual material removal, i.e. is successively reduced and almost eliminated. To achieve this, it is expedient to select a smaller standardized material removal size than before for each subsequent individual material removal. This results in a particularly high, i.e. rapid, reduction in unbalance at the beginning of the material removal, while towards the end, as the material removal size decreases, the unbalance is reduced as precisely as possible. This approach leads to extremely low unbalance at the expense of the material removal time.The higher the number of individual material removals and / or the smaller the material removal amounts in relation to the difference between the unbalance and the threshold value, the longer it takes to reduce the unbalance to a value below the threshold value. In other words, the longer the material removal time. Therefore, it is particularly preferred to select material removal amounts that reduce the material removal time. This is preferably achieved by determining or selecting material removal amounts that are as large as possible in relation to the difference between the unbalance and the threshold value, while simultaneously being smaller than the unbalance.In other words, by determining the material removal quantities, the number of individual material removals is minimized in such a way that the material removal time is minimized and at the same time it is ensured that the unbalance after the material removal corresponds to a size below the threshold value.

[0035] In principle, it is preferred if the individual material removal quantities are graduated relative to one another. In principle, it is expedient if the individual material removal quantities are predetermined. Furthermore, it is preferred if the graduation to the next larger material removal quantity is at least 5%, 10%, 15%, 20%, 30%, 40%, or 50%.

[0036] The object relating to the balancing machine is achieved by a balancing machine which is configured to carry out the method according to the invention. The balancing machine preferably has sensors to determine the imbalance. Furthermore, it is expedient if the balancing machine has a laser source which in particular comprises one laser diode or several laser diodes, wherein laser radiation or laser beams can be generated by the laser source or the laser diode or the several laser diodes. Furthermore, it is expedient for the balancing machine to comprise a control unit which is configured to operate the balancing machine. Furthermore, it is expedient if the control unit is configured to evaluate sensor signals determined by the sensors. Furthermore, it is advantageous if the control unit can operate the laser source or the laser diode or the several laser diodes.Furthermore, it is advantageous if the control device is configured to operate the balancing machine in such a way that the balancing machine carries out the method according to the invention.

[0037] This creates a balancing machine that enables the balancing process to be as short as possible.

[0038] The problem regarding the computer program is solved by a computer program that includes instructions that cause the balancing machine to execute the method steps of the method according to the invention. Such a computer program can be executed, for example, by the control unit of the balancing machine.

[0039] The problem regarding the computer-readable medium is solved by a computer-readable medium on which the computer program according to the invention is stored. The computer-readable medium is preferably a non-volatile memory. Preferably, the computer-readable medium or the non-volatile memory is included in the control unit.

[0040] The object with regard to the rotating component is achieved by providing a rotating component for the method according to the invention. The rotating component is preferably designed such that it comprises a material accumulation and / or material accumulations, in particular made of plastic or brass, which are designed and / or provided to enable the reduction of the imbalance by means of material removal on the rotating component. In other words, special locations are provided on the rotating component at which the material removal and / or the individual material removals can be carried out in order to reduce the imbalance. According to the explanations regarding the method, the rotating component can be different types of rotating components, such as pump impellers or rotors for pumps.These material accumulations are preferably circular or ring-shaped, allowing for ring-segment-shaped or circular-segment-shaped removal. This ensures that sufficient material is retained at the necessary locations to reduce imbalance using the method according to the invention.

[0041] Advantageous further developments of the present invention are described in the subclaims and in the following description of the figures. Short description of the drawings

[0042] The invention is explained in detail below using exemplary embodiments with reference to the drawings. In the drawings: Fig. 1 a balancing machine according to the invention, and Fig. 2 a flowchart of the method according to the invention, Preferred embodiment of the invention

[0043] The Fig. 1 shows a balancing machine 1 according to the invention with a rotating component 2 for an electric pump to be balanced. The electric pump is preferably a vacuum pump, a so-called active purge pump, while the rotating component 2 is a rotor-pump impeller unit. In addition, the balancing machine 1 comprises a laser source 4a having a laser diode 4b with which laser radiation 3 in the form of a laser beam can be directed onto the rotating component 2, whereby material is removed to reduce the imbalance of the rotating component 2, since the rotating component 2 is at least partially made of plastic. The plastic is matched to the laser beam in such a way that material is removed when the laser beam strikes the plastic of the rotating component 2.Furthermore, the balancing machine 1 comprises a control unit 5 with a computer-readable medium 6 according to the invention, which is designed as a non-volatile memory. The balancing machine can be operated by means of the control unit 5. The computer program 7 according to the invention is stored on the computer-readable medium 6, wherein the computer program 7 comprises commands that cause the balancing machine 1 to execute the method according to the invention.

[0044] The Fig. 2 shows a flow chart of the method according to the invention, which is carried out by the balancing machine from Fig. 1 is executable. First, the method is initialized 8. This is followed by the first method step 9, which comprises determining an imbalance of the rotating component. This is followed by the second method step 10, which comprises determining the number of individual material removals and their material removal sizes, specifically such that the resulting unbalance of the rotating component after the material removal corresponds to a size below the threshold value. Next, the third method step 11 follows, which comprises reducing the unbalance by means of material removal on the rotating component if the imbalance corresponds to at least one threshold value. The material removal comprises at least two individual material removals using laser radiation.This is followed by the fourth method step 12, which initiates the termination 13 of the method if the imbalance resulting after material removal corresponds to a value below the threshold value. If the imbalance resulting after material removal continues to correspond to at least the threshold value, the fourth method step initiates a repetition of the third method step 11, after which the fourth method step 12 is performed again. At the same time, an algorithm or artificial intelligence is used to adjust or correct the standardized material removal value(s) used in such a way that a repetition of the fourth method step 12 is no longer necessary in the future.

[0045] The different features of the individual embodiments can also be combined with each other.

[0046] The examples of the Fig.1 to 2 are not restrictive in nature and serve to clarify the inventive concept. List of reference symbols 1 balancing machine 2 Rotational component 3 Laser radiation 4a Laser source 4b Laser diode 5 Control unit 6 computer-readable medium 7 Computer program 8 Initialization 9 first procedural step 10 second procedural step 11 third procedural step 12 fourth procedural step 13 Termination

Claims

[1] Method for reducing an unbalance of a rotating component (2) for an electric pump, comprising the following steps: - Determining an imbalance of the rotating component (2), - reducing the unbalance by removing material from the rotating component (2) if the unbalance corresponds to at least one threshold value, wherein the material removal comprises at least two individual material removals by means of laser radiation (3), whereby the individual material removals are each assigned to one of at least two standardized material removal sizes, wherein the at least two material removal quantities differ from each other by the unbalance reduction quantities assigned to them, - determining the number of individual material removals and their material removal sizes, such that the resulting unbalance of the rotating component (2) after the material removal corresponds to a size below the threshold value, - Correcting the standardized material removal quantities if the resulting unbalance of the rotating component (2) after the material removal deviates from a value that results from the unbalance less the unbalance reduction quantities of the individual material removals carried out, which result from the material removal. [2] Method according to claim 1, wherein the individual material removals take place at least partially simultaneously or sequentially. [3] Method according to one of the preceding claims, wherein after the reduction of the unbalance the resulting unbalance of the rotary component (2) is determined, wherein the method is repeated if after the reduction of the unbalance the resulting unbalance of the rotary component (2) corresponds at least to the threshold value, and / or the method is terminated if after the reduction of the unbalance the resulting unbalance of the rotary component (2) is below the threshold value. [4] Method according to one of the preceding claims, wherein the material removal quantities differ from one another in their shape, in their distance from the axis of rotation of the rotating component (2) and / or in their dimensions. [5] Method according to one of the preceding claims, wherein the determination of the necessary number of individual material removals and / or the material removal sizes is carried out as a function of the material removal duration and / or the difference between the unbalance and the threshold value. [6] Balancing machine (1) configured to carry out the method according to any one of the preceding claims. [7] A computer program (7) comprising instructions causing the device of claim 6 to carry out the method steps according to any one of methods 1 to 5. [8] Computer-readable medium (6) on which the computer program (7) according to claim 7 is stored.

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