Fan impeller dynamic balance detection method, leveling method and leveling system

Abstract

The present invention discloses a method for detecting the dynamic balance of a fan impeller, comprising the following steps: S1, constructing a signal output surface on the impeller; S2, constructing a signal receiving surface outside the signal output surface; S3, the signal receiving surface operates synchronously with the signal output surface, receives the signal from the signal output surface, and establishes a signal change surface; S4, establishing an imbalance distribution model according to the signal change surface; S41, defining a balance horizontal plane; S42, defining a range center point, and obtaining the range area; S43, obtaining the position of the highest point of the range, and the distance from the highest point to the balance horizontal plane is the height information; S44, obtaining the point distance between the center point of the range and the highest point of the range projected to the balance horizontal plane, and defining the point distance as the imbalance distribution center point; S45, defining a circular area obtained with a radius from the center point to the nearest point of the range as the imbalance distribution area; S46, defining a height threshold according to custom, and giving the imbalance situation of the imbalance distribution area according to the height information.

Description

Technical Field

[0001] The present invention belongs to the technical field of impeller dynamic balance detection, and in particular relates to a fan impeller dynamic balance detection system and detection method. Background Art

[0002] Fan impeller dynamic balancing is a testing technique that ensures optimal impeller operation. The fan impeller dynamic balancing system consists of an engine, aerodynamic analysis, measurement system, data processing components, control system, and instrumentation. Its goal is to determine if the impeller is balanced, measure its imbalance, and then reduce or increase the weight to bring the imbalance value within acceptable limits.

[0003] Chinese patent publication number CN108119384B discloses a method and apparatus for adjusting the dynamic balancing of a centrifugal compressor rotor. The method first monitors the vibration state of the centrifugal compressor rotor, then obtains the phase and mass of the rotor's dynamic balancing weight, and finally achieves balance by adjusting the counterweight. The patent discloses a balancing adjustment scheme that uses vibration state detection to position the counterweight for leveling. However, the implementation scheme for the counterweight, as well as the specific method for obtaining the phase and mass of the weight, are not detailed, meaning the scheme is incomplete and unfavorable for intelligent implementation.

[0004] In summary, dynamic balance detection and balancing actually involves finding the unbalanced position and adjusting it to balance it. Chinese patent applications with publication numbers CN115333314A and CN115378210A disclose dynamic balance adjustment methods, one of which adjusts the mass distribution by adjusting the amount of liquid by changing the size of the deformation chamber, and the other adjusts the mass distribution by controlling the strength of the electromagnet and adjusting the distribution of iron powder. The main focus of this solution is on how to achieve weight adjustment, leading the applicant to apply for multiple series of inventions. However, the leveling in this technology is not combined with the acquisition of the unbalanced position, making it difficult to ensure adjustment accuracy and efficiency. Although it has a certain leveling capability, it is unable to accurately determine the unbalanced position, resulting in reduced adjustment capability. Summary of the Invention

[0005] The purpose of the present invention is to provide a fan impeller dynamic balance detection method, leveling method and leveling system to solve the problems of low accuracy caused by low efficiency of existing impeller dynamic balance detection, low leveling efficiency and low consistency between detection and leveling.

[0006] In order to achieve the purpose of the present invention, the present invention discloses a method for detecting the dynamic balance of a fan impeller, comprising the following steps:

[0007] S1. Construct a signal output surface on the impeller;

[0008] Specifically, a plurality of output units are evenly arranged on the impeller, and the output units are optical signal output or magnetic signal output;

[0009] S2. construct a signal receiving surface outside the signal output surface;

[0010] Specifically, the signal receiving surface is used to receive optical signals or magnetic signals;

[0011] S3, the signal receiving surface receives the signal from the signal output surface and establishes a signal change surface;

[0012] Specifically, the signal receiving surface operates synchronously with the signal output surface, and a curved surface is established based on the optical signal or magnetic signal. During normal operation, the curved surface tends to be flat, and its vibration is allowed within a certain range, which is considered to be in a balanced state. When imbalance occurs, unevenness will appear on the composed plane, which is the distribution of the imbalance amount. The surface model is obtained here through MATLAB modeling.

[0013] S4. Establish an imbalance distribution model based on the signal change surface; obtain the distribution of convex and concave parts, including range and height information, by feature capture; specifically,

[0014] First, define the equilibrium horizontal plane; the equilibrium horizontal plane is the plane where most feature points are located, and it is defined as the equilibrium horizontal plane;

[0015] Then define the center point of the range on the concave and convex parts to obtain the range area; grab the area of ​​the concave and convex parts on the equilibrium horizontal plane, which is the range area;

[0016] Then the highest point position of the range is obtained, and the distance from the highest point to the equilibrium horizontal plane is the height information;

[0017] Finally, the distance between the center point of the range and the highest point of the range projected onto the balanced horizontal plane is calculated. The midpoint of this distance is defined as the center point of the imbalance distribution. A circular area is drawn with the radius from the center point to the nearest point of the range. This area is the imbalance distribution area. A height threshold is defined according to convention, and the imbalance distribution of the imbalance distribution area is given based on this height information. Because the model has multiple concave and convex areas, some of which are relatively small and unavoidable imbalance, which means that the vibration they generate is within the allowable range. Therefore, a threshold is defined according to convention, and data points outside the threshold are removed to obtain the required data points.

[0018] The present invention also discloses a leveling method based on the fan impeller dynamic balance detection method, comprising the following steps:

[0019] S5. Construct an adjustment surface. The function of the adjustment surface is to solve the imbalance on the impeller. In the prior art, leveling is usually performed by adding or removing weight.

[0020] S6. Based on the imbalance distribution model, construct an adjustment surface model that is a mirror image of the imbalance distribution model.

[0021] Preferably, the adjustment surface model includes a panel, mounting studs provided on the panel, and counterweight nuts threadedly mounted on the mounting studs. This solution is to perform leveling by adding or removing weights, and balance is achieved by adding or removing counterweight nuts on the mounting studs.

[0022] Preferably, the regulating surface model includes a panel and electromagnets evenly distributed on the panel.

[0023] The construction of the regulation model comprises the following steps:

[0024] S7. Obtain the imbalance distribution model and extract its feature points. The extraction of the feature points is the re-extraction of the height information and range information in step S4.

[0025] S8. Define the feature point on the adjustment surface, find the nearest electromagnet, and define it as the leveling point; since the distribution of electromagnets cannot achieve full coverage, there is a situation where it is impossible to achieve point-to-point relative coverage. Based on this, we can only find the nearest electromagnet to achieve leveling.

[0026] S9, converting the height information into current information of the electromagnet, and adjusting the current flowing through the electromagnet;

[0027] S10: Obtain the latest unbalanced distribution model and adjust the current information until the current information tends to be stable.

[0028] The present invention also discloses a fan impeller dynamic balancing and leveling system, including an impeller unit, a drive unit, a detection unit and an adjustment unit. The drive unit is used to drive the impeller unit to rotate. The detection unit includes a signal output module arranged on the impeller unit, a signal receiving module and a signal processing module that operate synchronously with the impeller unit. The adjustment unit includes an electromagnetic adjustment module and an electromagnetic execution module. The electromagnetic adjustment module is responsible for receiving information from the signal processing module and controlling the execution of the electromagnetic execution module.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The fan impeller dynamic balance detection method of the present invention constructs a standard imbalance distribution by optimizing the data of the actual imbalance, which is helpful for the next leveling step.

[0031] The fan impeller dynamic balancing and leveling method of the present invention is combined with a magnetic signal detection method. By giving a variable current to the electromagnet, an adjustment surface model identical to the imbalance surface model is given. The high efficiency of surface construction leads to high leveling efficiency. At the same time, the same signal input and output are used, which has high accuracy and is conducive to ensuring the accuracy of leveling.

[0032] The fan impeller balancing and leveling system of the present invention solves the problems of low accuracy caused by low efficiency of existing impeller dynamic balancing detection, low leveling efficiency, and poor consistency between detection and leveling by organically coordinating the detection signal with the leveling signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the structure of the leveling system of the present invention;

[0034] Figure 2 Schematic diagram of the distribution of unbalanced points in step S4 of the present invention;

[0035] Figure 3 This is a schematic diagram of capturing the center point of the imbalance distribution in step S4 of the present invention;

[0036] Figure 4 for Figure 3 Partial enlarged view;

[0037] Figure 5 Schematic diagram of the imbalance distribution in step S4 of the present invention.

[0038] Figure numerals: 1. impeller unit; 2. drive unit; 3. detection unit; 4. adjustment unit; 5. magnetic surface; 6. auxiliary drive structure; 31. signal output module; 32. signal receiving module; 41. electromagnetic execution module. DETAILED DESCRIPTION

[0039] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0040] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] Example 1

[0044] This embodiment discloses a method for detecting the dynamic balance of a fan impeller, comprising the following steps:

[0045] S1. Construct a signal output surface on the impeller;

[0046] S2. construct a signal receiving surface outside the signal output surface;

[0047] S3, the signal receiving surface operates synchronously with the signal output surface, receives the signal from the signal output surface, and establishes a signal change surface;

[0048] S4. Establishing an imbalance distribution model based on the signal change surface;

[0049] Specifically, obtain the distribution of convex and concave parts on the signal change surface, including range and height information;

[0050] S41. Define a balanced horizontal plane. The balanced horizontal plane is the plane where most signal points are located. This is defined as the balanced plane. Uneven areas relative to this balanced plane are unbalanced points. The distribution values ​​of the unbalanced points are connected to form a curved surface. Unbalanced data can be obtained by processing the data on the uneven surface.

[0051] S42. Define the center point of the range and obtain the area of ​​the range; use software to capture the center point of the concave and convex surface projection range. The area of ​​the range is provided to assist in quickly obtaining the center point.

[0052] S43. Obtain the highest point within the range. The distance from the highest point to the equilibrium horizontal plane is the height information. The highest point indicates the imbalance, that is, the amount of imbalance. Existing techniques achieve balance by adding or removing weight at relative positions to measure the imbalance. Since the above values ​​are actual values, there are slight errors in the data. Balancing based on these actual values ​​results in a large amount of data, which is inconvenient to calculate. Therefore, this data needs to be processed.

[0053] S44, obtaining the distance between the center point of the range and the highest point of the range projected onto the equilibrium horizontal plane, and defining the midpoint of the distance as the center point of the imbalance distribution;

[0054] S45. The circular area obtained by taking the center point to the nearest point of the range as the radius is defined as the imbalance distribution area;

[0055] S46. Define a height threshold according to custom, and provide an imbalance situation of the imbalance distribution area according to the height information.

[0056] According to S45 and S46, the conversion of the actual value is completed, and the original irregular shape is converted into a regular cone, with the height as the vertex, that is, the imbalance is obtained, and the bottom surface of the cone is the imbalance distribution phase, which is conducive to the adjustment of the leveling unit.

[0057] The signal output surface includes output units uniformly distributed across the impeller, which can output photoelectric or magnetic signals. This embodiment is only used to detect phase and imbalance, so optical signals can be used for detection. Radar signals or other ranging signals can also be used, primarily to detect distance fluctuations caused by vibration. The principle of magnetic signal output here also uses distance measurement.

[0058] This embodiment

[0059] Example 2

[0060] This embodiment discloses a method for dynamic balancing and leveling a fan impeller, comprising the following steps:

[0061] S5, constructing an adjustment surface;

[0062] S6. Based on the imbalance distribution model, construct an adjustment surface model that is a mirror image of the imbalance distribution model.

[0063] The regulating surface is fixedly connected to the impeller as a whole. The regulating surface model includes a panel, a mounting stud arranged on the panel, and a counterweight nut threadedly mounted on the mounting stud.

[0064] The adjustment surface of this embodiment is weight adjustment. The solution in Example 1 is used to determine the unbalanced position. The corresponding mounting stud position is then found, and the weight nuts are added or removed. The unbalanced value and the amount of increase or decrease can be calculated using conventional formulas. This embodiment discloses a relatively conventional technical method, and other intelligent designs of the adjustment surface can be used to achieve automatic weight increase and reduction.

[0065] Example 3

[0066] Unlike Example 2, the regulating surface and the impeller in this embodiment are split structures, and are kept consistent with the impeller speed through the auxiliary drive structure 6. The regulating surface model includes a panel and electromagnets evenly distributed on the panel. This embodiment does not use gravity for leveling, but uses magnetism for leveling. Specifically, a magnetic surface is provided on the impeller. In order not to interfere with the detection, a magnetic surface 5 can be provided at the other end of the impeller, that is, the side opposite to the signal output surface. Here, the signal output surface uses magnetic signal output, and the receiving surface receives the magnetic pole signal to produce an unbalanced distribution model as in Example 1. Since the output quantity is a magnetic signal, the regulating quantity is also a magnetic signal, the regulating efficiency is relatively high, and balance can be achieved quickly.

[0067] Building the adjustment surface model includes the following steps:

[0068] S7. Obtain an imbalance distribution model and extract its characteristic points. The characteristic point information includes the imbalance distribution center point, the imbalance distribution area, and the imbalance amount. This step is actually to obtain the cone information in Example 1.

[0069] S8. Define the corresponding imbalance center point and imbalance distribution area on the adjustment surface, that is, distribute the cone information in step S7 on the adjustment surface. Due to the limited distribution of electromagnets, there is a situation where there is incomplete coverage. It is necessary to select the electromagnet as the leveling point by constructing a selection model. Specifically, constructing the selection model includes the following steps:

[0070] S81. Find the unbalanced distribution area defined on the adjustment surface, that is, find the coverage surface;

[0071] S82, find the electromagnet in the area in S81, and find the electromagnet in the coverage area;

[0072] If no electromagnet is found in the area, the area of ​​the area is expanded until at least one electromagnet is found in the area and defined as the leveling point; when the coverage area is small and there is no electromagnet in the area, leveling can only be performed through the surrounding electromagnets to expand the area. The interval time, radius, etc. can be adjusted based on multiple tests. When the first electromagnet is found, it is defined as the electromagnet for leveling. Since the electromagnet is not in the center position, it cannot directly output according to the standard value when outputting a signal, and needs to be adjusted through step S9.

[0073] If there are multiple electromagnets in the area, define them as combined leveling points and calculate the distributed current for each electromagnet. If the area is large and contains multiple electromagnets, the area reduction solution is not applicable. Therefore, all electromagnets in the area must be selected. If there are electromagnets that are not fully covered, they will be selected if the coverage area exceeds 60%. If not, they will be discarded. Since multiple electromagnets can generate a combined magnetic signal, it is necessary to calculate the combined force.

[0074] S9, converting the unbalanced state into current information of the electromagnet, and adjusting the current flowing through the electromagnet;

[0075] S91. Simulating the unbalanced state as an adjustment surface model constructed by an electromagnet according to the conversion model;

[0076] S92. Calculate the current required by the electromagnet to construct the adjustment surface model described in S91, and gradually increase or decrease the current until the model is constructed. Current adjustment is the calculation of the resultant force or the magnetic output of a single electromagnet. The adjustment formula can be obtained by fitting multiple test data and performing calculations.

[0077] S10: Obtain the latest imbalance distribution model and adjust the current information until the current information stabilizes. Imbalances may occur during continuous operation, and the latest imbalance distribution information is obtained at intervals. This allows the solution to perform real-time leveling, even for intact impellers.

[0078] Example 4

[0079] This embodiment discloses a fan impeller dynamic balancing and leveling system, including an impeller unit 1, a drive unit 2, a detection unit 3 and an adjustment unit 4. The drive unit 2 is used to drive the impeller unit 1 to rotate. The detection unit 3 includes a signal output module 31 arranged on the impeller unit 1, a signal receiving module 32 and a signal processing module that operate synchronously with the impeller unit. The adjustment unit 4 includes an electromagnetic adjustment module and an electromagnetic execution module 41. The electromagnetic adjustment module 41 is responsible for receiving information from the signal processing module and controlling the execution of the electromagnetic execution module.

[0080] The above is only an embodiment of the present invention, and common sense such as the specific structure and characteristics of the scheme are not described in detail here. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claim involved.

Claims

1. A method for detecting the dynamic balance of a fan impeller, characterized in that: The following steps are involved: S1. Construct a signal output surface on the impeller; S2. Construct a signal receiving surface outside the signal output surface; S3, the signal receiving surface operates synchronously with the signal output surface, receives the signal from the signal output surface, and establishes a signal change surface; S4. Establishing an imbalance distribution model based on the signal change surface; Specifically, obtain the distribution of convex and concave parts on the signal change surface, including range and height information; S41. Define the equilibrium level; S42, defining the center point of the range and obtaining the area of ​​the range; S43, obtaining the highest point position within the range, and the distance from the highest point to the equilibrium horizontal plane is the height information; S44, obtaining the distance between the center point of the range and the highest point of the range projected onto the equilibrium horizontal plane, and defining the midpoint of the distance as the center point of the imbalance distribution; S45. The circular area obtained by taking the center point to the nearest point of the range as the radius is defined as the imbalance distribution area; S46. Define a height threshold according to custom, and provide an imbalance situation of the imbalance distribution area according to the height information.

2. The method for detecting dynamic balance of a fan impeller according to claim 1, wherein: The signal output surface includes output units uniformly disposed on the impeller, and the output units are photoelectric signal output or magnetic signal output.

3. A leveling method based on the fan impeller dynamic balance detection method according to claim 2, characterized in that: The following steps are involved: S5, constructing an adjustment surface; S6. Constructing an adjustment surface model that is a mirror image of the imbalance distribution model based on the imbalance distribution model; the adjustment surface model includes a panel and electromagnets evenly distributed on the panel; The construction of the adjustment surface model comprises the following steps: S7. Obtain an imbalance distribution model and extract its feature points, wherein the feature point information includes the imbalance distribution center point, the imbalance distribution area, and the imbalance amount; S8. defining the corresponding unbalance center point and unbalance distribution area on the adjustment surface, and selecting the electromagnet as the leveling point by constructing a selection model; S9, converting the unbalanced state into current information of the electromagnet, and adjusting the current flowing through the electromagnet; S91. Simulating the unbalanced state as an adjustment surface model constructed by an electromagnet according to the conversion model; S92, calculating the current required by the electromagnet to construct the adjusted surface model in S91, and gradually increasing or decreasing the current until the model is constructed; S10: Obtain the latest unbalanced distribution model and adjust the current information until the current information tends to be stable.

4. The leveling method according to claim 3, characterized in that: The regulating surface is fixedly connected to the impeller as a whole.

5. The leveling method according to claim 4, characterized in that: The regulating surface and the impeller are of separate structures, and the regulating surface keeps the same rotation speed with the impeller through an auxiliary driving structure.

6. The leveling method according to claim 4, characterized in that: The adjustment surface model includes a panel, a mounting stud arranged on the panel, and a counterweight nut threadedly mounted on the mounting stud.

7. The leveling method according to claim 3, characterized in that: The construction of the selection model comprises the following steps: S81. Find an unbalanced distribution area defined on the adjustment surface; S82, find the electromagnet in the area of ​​S81, If no electromagnet is found in the area, the area of ​​the area is expanded until at least one electromagnet is found in the area, which is defined as the leveling point. If there are multiple electromagnets in the area, define the multiple electromagnets as combined leveling points and calculate the distributed current of each electromagnet.

8. A leveling system based on the leveling method according to claim 7, characterized in that: It includes an impeller unit, a driving unit, a detection unit and an adjustment unit. The driving unit is used to drive the impeller unit to rotate. The detection unit includes a signal output module arranged on the impeller unit, a signal receiving module and a signal processing module that operate synchronously with the impeller unit. The adjustment unit includes an electromagnetic adjustment module and an electromagnetic execution module. The electromagnetic adjustment module is responsible for receiving information from the signal processing module and controlling the execution of the electromagnetic execution module.

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