A method for determining the center of a large fan impeller and an impeller safety system

Abstract

The present invention relates to the technical field of fan impellers, and in particular to a method for determining the center of a large fan impeller and an impeller safety system, comprising preparing a transparent plate; positioning and fixing the transparent plate; tracing an impeller contour on the outer wall of the transparent plate; checking and correcting the traced impeller contour; marking key points of the impeller on the outer wall of the transparent plate; determining the center of the impeller and the equally divided points by calculation; verifying the calculation results and drilling marks on the outer wall of the impeller; the present invention has the following beneficial effects: improving the positioning accuracy of the impeller center, reducing the imbalance of the impeller, and significantly reducing the vibration level of the adjusted impeller under various wind speeds, thereby ensuring the long-term stable operation of the fan, and reducing the vibration means reducing the wear of mechanical parts, improving the service life and safety of the equipment, and reducing the maintenance frequency and extending the life of the equipment, which can bring significant economic benefits to the power plant.

Description

Technical Field

[0001] The invention relates to the technical field of fan impellers, and in particular to a method for determining the center of a large fan impeller and an impeller safety system. Background Art

[0002] As an important energy conversion device, the operating efficiency and stability of large wind turbines directly affect the performance of the entire wind power generation system. As the core part of the wind turbine, the impeller's design and manufacturing process directly determine the aerodynamic performance and durability of the wind turbine. However, in the existing wind turbine impeller manufacturing process, especially the determination of the impeller center is a technical problem. Traditional center determination methods rely on mechanical measuring tools such as calipers and gauges. These methods are susceptible to human factors and environmental influences when dealing with large, irregularly shaped impellers, resulting in inaccurate positioning, which affects subsequent assembly and operation.

[0003] During long-term operation, the impeller may become unbalanced due to factors such as wind pressure, temperature changes, and dust accumulation, which may lead to serious vibration problems. This vibration will not only reduce the power generation efficiency of the fan, but also accelerate mechanical wear and even endanger equipment safety.

[0004] Based on the above problems, we proposed a method for determining the center of a large fan impeller and an impeller safety system. Summary of the invention

[0005] In view of the above-mentioned technical problem that the center of a large, irregularly shaped impeller is easily located inaccurately when determining the center, a method for determining the center of a large fan impeller in the present invention is proposed.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: a method for determining the center of a large fan impeller, which includes preparing a transparent plate; positioning and fixing the transparent plate; tracing the impeller contour on the outer wall of the transparent plate; checking and correcting the traced impeller contour; marking the key points of the impeller on the outer wall of the transparent plate; determining the center of the impeller and the equal division points by calculation; verifying the calculation results and drilling marks on the outer wall of the impeller.

[0007] As a preferred solution of the method for determining the center of a large fan impeller of the present invention, the surface of the transparent plate needs to be clean, free of scratches, dust and stains, and its size must be able to cover the entire surface of the impeller.

[0008] As a preferred solution of the method for determining the center of a large fan impeller of the present invention, the impeller is placed on a workbench to ensure that it is stable and motionless, and the transparent plate is placed above the impeller to align the center of the impeller.

[0009] As a preferred solution of the method for determining the center of a large fan impeller of the present invention, a fixing device is used to fix the transparent plate to prevent it from moving during the copying process.

[0010] As a preferred solution of the method for determining the center of a large fan impeller of the present invention, a marking pen is used to trace the outline of the impeller on the outer wall of the transparent plate.

[0011] As a preferred solution of the method for determining the center of a large fan impeller of the present invention, it is necessary to check whether the outline on the transparent plate is consistent with the actual outline of the impeller. If there are deviations or unclear parts, they can be corrected with a fine marker pen.

[0012] As a preferred solution of the method for determining the center of a large fan impeller of the present invention, the starting point and the ending point key points of the impeller blades are marked on the outer wall of the transparent plate.

[0013] As a preferred solution of the method for determining the center of a large fan impeller of the present invention, the center position of the impeller is calculated by the mathematical principle of determining the center of a circle, and the equal division points are marked using the mathematical principle of eight equal divisions to ensure the symmetry and balance of the impeller during installation and maintenance.

[0014] As a preferred solution of the method for determining the center of a large fan impeller of the present invention, the equally divided points are verified using a measuring device, and the marked points on the transparent plate are transferred to the impeller, and the marked points are drilled on the impeller using a drilling tool.

[0015] As a preferred solution of the impeller safety system of the present invention, it includes a method for determining the center of a large wind turbine impeller, as well as; an impeller center positioning module, a sensing module, a processing module and an execution and maintenance module; the impeller center positioning module provides initial balance parameters; the sensing module monitors the impeller status in real time and transmits the data to the processing module; the processing module analyzes the data and makes a decision, and sends the decision instruction to the execution and maintenance module.

[0016] The beneficial effects of the present invention are: the positioning accuracy of the impeller center is improved, the imbalance of the impeller is reduced, and the vibration level of the adjusted impeller is significantly reduced under various wind speeds, ensuring the long-term stable operation of the fan. The reduced vibration means reduced wear of mechanical parts, improved service life and safety of the equipment, reduced maintenance frequency and extended equipment life, which can bring significant economic benefits to the power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 The figure is a flow chart of the method for determining the center of the large fan impeller in the present invention.

[0019] Figure 2 It is a schematic diagram of the transparent plate and the impeller in the present invention.

[0020] Figure 3 A schematic diagram of a perpendicular midline is made for the marking points in the present invention.

[0021] Figure 4 For the present invention Figure 3 The enlarged view of the structure of part "A" is the schematic diagram of determining the center of the circle.

[0022] Figure 5 This is a flow chart of the impeller safety system in the present invention. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0026] Example 1, reference Figure 1-2, which is the first embodiment of the present invention, and this embodiment provides a method for determining the center of a large fan impeller, including S1: preparing a transparent plate 100; S2: positioning and fixing the transparent plate 100; S3: tracing the outline of the impeller 200 on the outer wall of the transparent plate 100; S4: checking and correcting the traced outline of the impeller 200; S5: marking key points of the impeller 200 on the outer wall of the transparent plate 100; S6: determining the center of the impeller 200 and the equal division points by calculation; S7: verifying the calculation results and drilling marks on the outer wall of the impeller 200.

[0027] Specifically, the surface of the transparent plate 100 needs to be clean, free of scratches, dust and stains, and ensure that it is large enough to cover the entire surface of the impeller 200.

[0028] The transparent plate 100 should be of suitable size to completely cover the surface of the impeller 200 whose center is to be determined. The surface of the transparent plate 100 (eg, acrylic plate) should be clean, without scratches, dust or stains.

[0029] Preferably, the impeller 200 is placed on a workbench to ensure that it is stable and motionless, and the transparent plate 100 is placed above the impeller and aligned with the center of the impeller 200.

[0030] The transparent plate 100 is placed above the impeller 200 , ensuring that the transparent plate 100 is aligned with the center of the impeller 200 .

[0031] Preferably, a fixing device is used to fix the transparent plate 100 to prevent movement during the copying process.

[0032] A fixing device (eg, a clamp or a suction cup) is used to fix the transparent plate 100 to ensure that the transparent plate 100 does not move or deform during the copying process.

[0033] Preferably, a marker is used to trace the outline of the impeller 200 on the outer wall of the transparent plate 100 .

[0034] Here, a marker is used to trace along the outline of the impeller 200 on the outer wall of the transparent plate 100. During the tracing process, the hand needs to be kept stable to avoid shaking or deviation. For complex shapes of the impeller 200, it can be traced in sections to ensure that the outline of each part is clearly visible.

[0035] Preferably, check whether the outline on the transparent plate 100 is consistent with the actual outline of the impeller 200. If there are deviations or unclear parts, they can be corrected with a fine marker pen.

[0036] After the copying is completed, carefully check whether the outline on the transparent plate 100 is consistent with the actual outline of the impeller 200. If any deviation or unclear part is found, it can be corrected with a fine marker to ensure that every detail is accurate.

[0037] Preferably, the starting point and the ending point of the blades of the impeller 200 are marked on the outer wall of the transparent plate 100 .

[0038] Among them, the key points of the fan impeller, such as the starting point, end point, and joining point of the blades, are marked on the outer wall of the transparent plate 100. The impeller 200 will be worn during operation and is not a standard circle. Several feature points need to be selected for places that are obviously not like a circle to the naked eye. These key points will be used for subsequent center determination and equal division operations.

[0039] Preferably, the center position of the impeller 200 is calculated by the mathematical principle of determining the center of a circle, and the equal division points are marked using the mathematical principle of eight equal divisions, thereby ensuring the symmetry and balance of the impeller 200 during installation and maintenance.

[0040] Among them, three non-collinear points A1, B1, and C1 are selected on the rim of the impeller 200 under the transparent plate 100. These points can be any three characteristic points on the contour of the impeller 200. The purpose of selecting non-collinear points is to ensure that these three points can uniquely determine a circle; two sides are selected through the three points A1, B1, and C1 (for example, A1B1 and B1C1) to draw the perpendicular bisectors of two line segments respectively, and the intersection of these two perpendicular bisectors is the center O1 of the triangle A1B1C1; on the transparent plate 10 Select two different sets of three points A2, B2, C2, A3, B3, C3 on the rim of the impeller 200 under 0, repeat the above steps to obtain the center O2 of the triangle A2B2C2 and the center O3 of the triangle A3B3C3; select any two sides (for example, select O1O2, O2O3) from the three points O1, O2, O3 to draw the perpendicular bisectors of two line segments respectively, the intersection of these two perpendicular bisectors is the center O of the triangle O1O2O3, which is also the center of the approximately circular impeller 200;

[0041] Starting from the center of the circle, choose any direction and make a "radius". Since the shape of the impeller 200 rim is irregular, the "radii" are not necessarily equal. The error of each radius is controlled within 0.1mm. This "radius" will be used as the starting point for equal division; the circumference is divided into eight equal parts, and the angle of each equal part is 360° / 8=45°. Therefore, it is necessary to make radii in eight directions at the center of the circle, and the angle between each radius is 45°; mark the equal division points at the intersection of each radius and the circumference. These equal division points divide the circumference evenly into eight parts, ensuring the symmetry and balance of the impeller 200 during installation and maintenance.

[0042] Preferably, the equally divided points are verified using a measuring device, and the marked points on the transparent plate 100 are transferred to the impeller 200 , and the marked points are drilled on the impeller 200 using a drilling tool.

[0043] In order to ensure the accuracy of equal division, a protractor or electronic measuring equipment can be used to verify each equal division point. If the angular error between all equal division points is within the allowable range of 0.1°, it means that the equal division operation is successful; the marking points on the transparent plate 100 are transferred to the impeller 200, and the marking points are drilled on the impeller 200 using a drilling tool. These marking points will be used for subsequent installation and debugging work.

[0044] In summary, the positioning accuracy of the center of the impeller 200 is improved through the method for determining the center of the large wind turbine impeller, and the imbalance of the impeller 200 is reduced. Under various wind speeds, the vibration level of the adjusted impeller 200 is significantly reduced, ensuring the long-term stable operation of the fan. The reduced vibration means reduced wear of mechanical parts, improved service life and safety of the equipment, reduced maintenance frequency and extended equipment life, which can bring significant economic benefits to the power plant.

[0045] Example 2, reference Figure 1 to Figure 4 This is the second embodiment of the present invention. Taking the first-phase boiler blower of a thermal power plant as an example, it is necessary to determine the impeller center. This blower model is FAF17-10-1, the impeller diameter is 1678mm, and there are 20 blades per stage. In order to ensure the stability and efficiency of the blower during operation, it is very important to accurately determine the impeller center.

[0046] 1. Choose a transparent acrylic sheet with a thickness of 5 mm. The length and width are slightly larger than the impeller diameter (1800 mm) to ensure that the impeller can be completely covered. The technician fixes the acrylic sheet above the impeller to ensure that it is parallel and centered with the impeller.

[0047] 2. Use a laser pen to trace the outline of the impeller on the acrylic plate. The technician uses a fine-line pen to mark along the outline on the acrylic plate to ensure the accuracy and continuity of the line. This process requires multiple corrections and adjustments to ensure that the outline on the acrylic plate is completely consistent with the actual impeller.

[0048] 3. After completing the outline, make installation marks, remove the acrylic plate, and the technicians use geometric principles to determine the center of the impeller. Select three groups of three non-collinear points (a total of 9 points) as reference points. The three points of each group of reference points should not be too close to each other. It is best to have a 120° difference on the rim. Mark them as (A1, B1, C1), (A2, B2, C2), (A3, B3, C3). The technicians use a ruler and compass to draw the perpendicular bisectors of the line segments A1B1 and A1C1 respectively. The intersection of these two perpendicular bisectors is the center point O1 of the triangle A1B1C1.

[0049] 4. Repeat step 3 for (A2, B2, C2) and (A3, B3, C3) to determine the center point O2 of triangle A2B2C2 and the center point O3 of triangle A3B3C3.

[0050] 5. Repeat step 3 for the new triangle O1, O2, O3 formed by the three points O1, O2, O3, and determine the center point O of the triangle O1O2O3, which is the center point of the impeller.

[0051] 6. After determining the center point, the technician further divides the impeller into eight equal parts. With the center point O as the center of the circle, choose any direction, and the horizontal direction is the best, to make a "radius". Since the shape of the fan impeller rim is irregular, the "radius" may not be equal. The error of each radius is controlled within 0.1mm. This "radius" will be used as the starting point for equal division.

[0052] 7 Calculate the angle of equal division: Divide the circumference into eight equal parts, and the angle of each equal part is 360° / 8=45°. Therefore, it is necessary to make eight radii at the center of the circle, and the angle between each radius is 45°.

[0053] 8. Mark the dividing points: Mark the dividing points at the intersection of each radius and the circumference. These dividing points divide the circumference into eight parts, ensuring the symmetry and balance of the impeller during installation and maintenance.

[0054] 9. Verify the accuracy of equal division: To ensure the accuracy of equal division, you can use a protractor or electronic measuring equipment to verify each equal division point. If the angle error between all equal division points is within the allowable range of 0.1°, it means that the equal division operation is successful.

[0055] 10. Transfer the marking points on the acrylic plate to the impeller and use a drilling tool to drill the marking points on the impeller. These marking points will be used for subsequent installation and commissioning work to ensure that the impeller remains balanced and stable during operation.

[0056] In summary, through this series of operations, the technicians successfully determined the center of the FAF17-10-1 fan impeller and completed the equal division marking, providing reliable guarantee for the efficient operation of the fan.

[0057] Example 3, reference Figure 1 to Figure 5 , which is the third embodiment of the present invention, provides an impeller safety system, including an impeller center positioning module 300, a sensing module 400, a processing module 500 and a maintenance execution module 600.

[0058] The impeller center positioning module 300 provides the initial balancing parameters of the impeller 200; the sensing module 400 includes a vibration monitoring sensor 401, a temperature monitoring sensor 402 and a pressure monitoring sensor 403, which can monitor the state of the impeller 200 in real time, collect vibration data, temperature data and wind pressure data, and transmit the data to the processing module 500; the processing module 500 includes a data acquisition unit 501 and a central processing unit 502, the data acquisition unit 501 collects data from the sensing module 400, the central processing unit 502 analyzes the data to make a decision, and sends the decision instruction to the execution maintenance module 600; the execution maintenance module 600 includes a control system 601, an alarm system 602 and a maintenance management system 603, the control system 601 adjusts the operating state of the fan according to the instruction of the central processing unit 502; the alarm system 602 issues an alarm when an abnormality is detected; the maintenance management system 603 records maintenance logs and predicts maintenance needs.

[0059] In summary, by implementing the impeller safety system, the stability and efficiency of the impeller 200 during operation can be ensured, and the vibration problem caused by the imbalance of the impeller 200 can be reduced, thereby reducing the maintenance cost of the fan and improving its operating efficiency.

[0060] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0061] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0062] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0063] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for determining the center of a large fan impeller, characterized in that: include, S1: preparing a transparent plate (100); S2: Positioning and fixing the transparent plate (100); S3: Tracing the outline of the impeller (200) on the outer wall of the transparent plate (100); S4: Checking and correcting the profile of the impeller (200); S5: marking key points of the impeller (200) on the outer wall of the transparent plate (100); S6: determining the center and the equally divided points of the impeller (200) by calculation; S7: Verify the calculation results and drill holes and mark the outer wall of the impeller (200).

2. The method for determining the center of a large fan impeller according to claim 1, characterized in that: The surface of the transparent plate (100) must be clean, free of scratches, dust and stains, and its size must be able to cover the entire surface of the impeller (200).

3. The method for determining the center of a large fan impeller according to claim 2, characterized in that: The impeller (200) is placed on a workbench to ensure that it is stable and motionless, and the transparent plate (100) is placed above the impeller and aligned with the center of the impeller (200).

4. The method for determining the center of a large fan impeller according to claim 3, characterized in that: A fixing device is used to fix the transparent plate (100) to prevent it from moving during the copying process.

5. The method for determining the center of a large fan impeller according to claim 4, characterized in that: Use a marker pen to trace the outline of the impeller (200) on the outer wall of the transparent plate (100).

6. The method for determining the center of a large fan impeller according to claim 5, characterized in that: Check whether the outline on the transparent plate (100) is consistent with the actual outline of the impeller (200). If there is a deviation or unclear part, a fine marker pen can be used to correct it.

7. The method for determining the center of a large fan impeller according to claim 6, characterized in that: The key points of the starting point and the ending point of the blades of the impeller (200) are marked on the outer wall of the transparent plate (100).

8. The method for determining the center of a large fan impeller according to claim 7, characterized in that: The center position of the impeller is calculated by using the mathematical principle of determining the center of a circle, and the equal division points are marked using the mathematical principle of eight equal divisions, thereby ensuring the symmetry and balance of the impeller (200) during installation and maintenance.

9. The method for determining the center of a large fan impeller according to claim 8, characterized in that: The equally divided points are verified using a measuring device, and the marked points on the transparent plate (100) are transferred to the impeller (200), and the marked points are drilled on the impeller (200) using a drilling tool.

10. An impeller safety system, characterized in that: The method comprises the method for determining the center of a large fan impeller as claimed in any one of claims 1 to 9, and; An impeller center positioning module (300), a sensing module (400), a processing module (500) and a maintenance execution module (600); The impeller center positioning module (300) provides initial balancing parameters; The sensing module (400) monitors the state of the impeller in real time and transmits the data to the processing module (500); The processing module (500) analyzes the data and makes a decision, and sends the decision instruction to the execution and maintenance module (600).

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