An optimized rotor running eccentric structure and its manufacturing method

Abstract

The present invention relates to an optimized rotor operation rotation eccentric structure and its manufacturing method, belonging to the technical field of rotor production. The rotor operation rotation eccentric structure includes a housing, a rotor disposed in the housing, and a fan connected to the rotor. The rotor is rotatably disposed in the housing. The rotor is successively provided with a rotor shaft core, a wear-resistant plate, and a magnet from top to bottom. A spherical surface protrusion is formed at the lower part of the rotor shaft core. The wear-resistant plate is provided with a recess portion that cooperates with the spherical surface protrusion. The fan is provided with a weight balance block. The method includes: Step 1: Assemble the fan and prepare for testing; Step 2: Use a machine to detect whether the mass deviation value of the fan blade exceeds the deviation threshold. When the judgment result is no, execute Step 3. When the judgment result is yes, it is regarded as qualified. Step 3: Set a weight balance block in the opposite direction of the mass deviation direction with the fan blade axis as the reference line, and return to Step 2; it can measure the mass distribution and has high test accuracy.

Description

Technical Field

[0001] This invention belongs to the field of rotor manufacturing technology, specifically relating to an optimized rotor rotational eccentric structure and its manufacturing method. Background Technology

[0002] Fans, especially small fans, are core heat dissipation components in various home appliances such as televisions and computers. They drive airflow or exhaust air by rotating at high speed. When the rotating structure of the fan, such as the axis of the rotor shaft, does not coincide with the axis of the fixed structure, the rotor shaft will constantly wobble during rotation, reducing its service life. After long-term rotation, the fan may wear out, and at this time, the fixed structure will not be able to hold the rotor shaft in place properly, further reducing its service life.

[0003] Therefore, eccentricity testing is required before fan assembly to optimize the eccentric structure. A typical testing method is a device for measuring the eccentricity of a screw pump rotor disclosed in CN210892979U, which includes a measuring base, a depth gauge holder fixedly mounted on the measuring base, and a digital depth gauge fixedly mounted on the depth gauge holder. This device modifies the existing digital depth gauge and provides a suitable device for measuring the eccentricity of a screw pump rotor. It has the advantages of simple structure, low cost, and convenient operation, making it suitable for mass production and widespread use.

[0004] However, the above schemes do not provide a correction plan for the rotor structure based on the test method, and the test only focuses on whether eccentricity has occurred. It cannot cope with the situation where eccentricity occurs after long-term rotation due to uneven weight of the rotating structure itself. The test is not very targeted. Therefore, there is a need for an optimized rotor rotation eccentricity structure that can measure mass distribution and has high test accuracy, as well as its manufacturing method. Summary of the Invention

[0005] To address the aforementioned problems in the existing technology, this invention provides an optimized rotor rotational eccentric structure and its manufacturing method, which features measurable mass distribution and high testing accuracy.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] An optimized rotor rotation eccentric structure includes a housing, a rotor disposed in the housing, and a fan connected to the rotor. The rotor is rotatably disposed in the housing. The rotor has a rotor shaft, a wear-resistant plate, and a magnet arranged sequentially from top to bottom. A spherical protrusion is formed on the lower part of the rotor shaft. The wear-resistant plate has a recessed portion that matches the spherical protrusion. The fan is provided with a weight balance block.

[0008] As a preferred embodiment of the present invention, a lubricating oil receiving cavity is provided between the wear-resistant plate and the magnet.

[0009] As a preferred embodiment of the present invention, the upper and lower edges of the fan are respectively provided with annular receiving grooves, which are used to accommodate weight balance blocks.

[0010] A method for manufacturing an optimized rotor rotational eccentric structure, applicable to the aforementioned optimized rotor rotational eccentric structure, further includes the following steps:

[0011] Step 1: Assemble the fan and prepare for testing;

[0012] Step 2: Use a machine to check whether the quality deviation of the fan blades exceeds the deviation threshold. If the result is negative, proceed to Step 3. If the result is positive, it is considered qualified.

[0013] Step 3: Using the fan blade axis as a reference line, set a weight balance block in the opposite direction of the mass deviation direction, and return to Step 2.

[0014] As a preferred embodiment of the present invention, step one further includes: setting the fan speed and measuring the fan mass, and calculating a deviation threshold based on the fan speed and the measured fan mass.

[0015] As a preferred embodiment of the present invention, step one further includes: setting the fan speed R and measuring the fan mass M, and calculating the deviation threshold A based on the fan speed and the measured fan mass, where A = R0 / R×M0 / M×A0, R0 is the pre-input standard speed, M0 is the pre-input standard weight, and A0 is the pre-input standard deviation threshold.

[0016] As a preferred embodiment of the present invention, step one further includes: measuring the eccentricity of the recessed portion of the wear-resistant sheet, and correcting the deviation threshold based on the eccentricity of the recessed portion.

[0017] As a preferred technical solution of the present invention, step one further includes: measuring the eccentricity of the recessed part of the wear-resistant sheet to obtain the eccentricity P of the receiving cavity, and correcting the deviation threshold A by a factor of X, where X = 1 - P / R, and R is the radius of the recessed part.

[0018] The beneficial effects of this invention are as follows:

[0019] (1) By setting a spherical protrusion below the rotor shaft core and setting a recessed part in conjunction with the spherical protrusion directly below the rotor shaft core, the spherical protrusion at the lower end of the rotor shaft core is embedded in the recessed part, thereby fixing the rotor shaft core and reducing the probability of rotor shaft core misalignment.

[0020] (2) The machine detects whether the mass deviation of the fan blade exceeds the deviation threshold, and sets a weight balance block in the opposite direction of the mass deviation to complete the mass deviation detection and correction of the fan blade, reduce the eccentricity trend caused by long-term rotation, improve the test accuracy, and correct the test results.

[0021] (3) At the same time, by improving the accuracy of the test, the fan eccentricity is lower, the air output efficiency is higher under unit energy consumption, and the energy saving effect or heat dissipation effect is improved.

[0022] (4) By calculating the deviation threshold based on the fan speed and measuring the fan mass, when the fan speed is high, the mass is large, and the eccentricity caused by the same degree of mass unevenness during use is large, the threshold is reduced so that a lower mass deviation value can trigger the threshold, thus improving the judgment standard. When the fan speed is low, the mass is low, and the eccentricity caused by the same degree of mass unevenness during use is small, there is no need to react to the minor mass unevenness, thus reducing the threshold and lowering the judgment standard.

[0023] (5) By measuring the eccentricity of the concave part of the wear-resistant sheet, the deviation threshold is corrected according to the eccentricity of the concave part. Before the assembly is completed, the wear-resistant sheet itself causes an eccentricity tendency. When it is necessary to improve the judgment standard for uneven blade quality, the judgment standard is further improved. Attached Figure Description

[0024] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the rotor shaft core of the present invention;

[0027] Figure 3 This is a schematic diagram of the wear-resistant plate of the present invention;

[0028] Explanation of key component symbols:

[0029] In the diagram: 1. Rotor shaft; 11. Spherical protrusion; 2. Fan blade; 21. Receiving groove; 3. Housing; 4. Wear-resistant plate; 41. Lubricating oil receiving cavity; 5. Magnet. Detailed Implementation

[0030] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0031] Please see Figure 1-3An optimized rotor rotation eccentric structure includes a housing 3, a rotor disposed in the housing 3, and a fan connected to the rotor. The rotor is rotatably disposed in the housing 3. The rotor has a rotor shaft core 1, a wear-resistant plate 4, and a magnet 5 arranged sequentially from top to bottom. A spherical protrusion is formed on the lower part of the rotor shaft core 1. The wear-resistant plate 4 has a recessed part that matches the spherical protrusion. The fan is provided with a weight balance block.

[0032] Specifically, the housing 3 has a shaft receiving cavity at its center. The shaft receiving cavity is cylindrical. An oil-impregnated bearing is installed in the shaft receiving cavity. The rotor shaft core 1 is installed in the oil-impregnated bearing. The outer side of the oil-impregnated bearing is rolled and fitted against the inner wall of the shaft receiving cavity, and the inner side is rolled and fitted against the rotor shaft core 1.

[0033] The bottom of the shaft receiving cavity has a groove, a strong magnet 5 is installed at the bottom of the groove, and a wear-resistant plate 4 is installed on the top surface of the strong magnet 5;

[0034] A spherical protrusion 11 is formed at the bottom of the rotor shaft core 1. The lower end of the rotor shaft core 1 is tapered inward, and a mushroom-shaped structure is formed at the bottom of the rotor shaft core 1. The spherical protrusion 11 at the bottom of the rotor shaft core 1 abuts against the wear-resistant plate 4. A recess is formed in the part of the wear-resistant plate 4 that contacts the bottom of the rotor shaft core 1 to accommodate the spherical protrusion 11.

[0035] When the rotor shaft core 1 tends to move eccentrically, pressure is applied to the inner wall of the recessed part of the wear-resistant plate 4. At this time, the wear-resistant plate 4 plays a fixing role and fixes the rotor shaft core 1 in place.

[0036] By setting a spherical protrusion below the rotor shaft core 1 and setting a recessed part in conjunction with the spherical protrusion 11 directly below the rotor shaft core 1, the spherical protrusion 11 at the lower end of the rotor shaft core 1 is embedded in the recessed part, thereby fixing the rotor shaft core 1 and reducing the probability of the rotor shaft core 1 being off-center.

[0037] A lubricating oil receiving cavity 41 is provided between the wear-resistant plate 4 and the magnet 5;

[0038] Specifically, the bottom of the wear-resistant plate 4 has a spherical recess, and the space between the spherical recess and the strong magnet 5 is used to fill lubricating oil.

[0039] When the fan is running, it needs to be replenished with lubricating oil at all times. At this time, by setting a lubricating oil receiving cavity 41 between the wear-resistant plate 4 and the magnet 5, the gap formed by the additional structure is utilized to improve the lubricating oil replenishment capacity, thereby improving the operating efficiency.

[0040] Meanwhile, the centers of the two spherical surfaces of the lubricating oil receiving cavity 41 and the recessed part coincide with the axis of the rotor shaft core 1, so that the lubricating oil receiving cavity 41 forms an arched structure located directly below the wear-resistant plate 4 and the rotor shaft core 1 on it, supporting the wear-resistant plate 4 and the rotor shaft core 1 on it, providing space for lubricating oil, and further enhancing the structural strength.

[0041] In actual production, the fan itself may experience uneven mass distribution. Over long-term rotation, this uneven mass distribution creates localized centrifugal force, causing the fan to tend towards eccentricity. Therefore, it is necessary to detect the degree of mass unevenness and place a weight counterweight away from the fan's axis based on this unevenness. To facilitate the placement of the weight counterweight, annular receiving grooves 21 are provided along the upper and lower edges of the fan. These grooves 21 are used to accommodate the weight counterweight; specifically, the annular receiving grooves 21 are arranged around the rotating shaft.

[0042] A method for manufacturing an optimized rotor rotational eccentric structure, characterized in that, applicable to the aforementioned optimized rotor rotational eccentric structure, it further includes the following steps:

[0043] Step 1: Assemble the fan and prepare for testing;

[0044] Step 2: Use the machine to check whether the quality deviation value of fan blade 2 exceeds the deviation threshold. If the result is negative, proceed to step 3. If the result is positive, it is considered qualified.

[0045] Step 3: Using the axis of fan blade 2 as a reference line, set a weight balance block in the opposite direction of the mass deviation direction, and return to step 2.

[0046] The machine detects whether the mass deviation of fan blade 2 exceeds the deviation threshold, and sets a weight balance block in the opposite direction of the mass deviation to complete the mass deviation detection and correction of fan blade 2. This reduces the eccentricity trend caused by long-term rotation, improves the test accuracy, and corrects the test results.

[0047] The detection standards for fans differ under different conditions. For example, when the fan has a large mass and a high speed, even with the same degree of mass unevenness, there is a greater centrifugal tendency, which can lead to more serious consequences. In this case, the threshold needs to be lowered so that a lower mass deviation value can trigger the threshold. When the fan speed is low, the mass is low, and the centrifugal tendency caused by the same degree of mass unevenness during use is small, there is no need to react to minor mass unevenness. The threshold can be increased to improve detection efficiency. Step one also includes: setting the fan speed and measuring the fan mass, and calculating the deviation threshold based on the fan speed and measured fan mass.

[0048] Specifically, step one also includes: setting the fan speed R and measuring the fan mass M, and calculating the deviation threshold A based on the fan speed and the measured fan mass, where A = R0 / R×M0 / M×A0, R0 is the pre-input standard speed, M0 is the pre-input standard weight, and A0 is the pre-input standard deviation threshold.

[0049] When the fan mass M is large or the speed R is large, the threshold needs to be reduced. At this time, the value of A = R0 / R×M0 / M×A0 is small. When the control module sets the deviation threshold to A, the threshold reduction is completed when the fan mass or speed is large.

[0050] Similarly, when the fan mass M is small or the speed R is small, the value of A = R0 / R×M0 / M×A0 is large. When the control module sets the deviation threshold to A, the threshold is raised.

[0051] By calculating the deviation threshold based on the fan speed and measuring the fan mass, when the fan speed is high, the mass is large, and the eccentricity caused by the same degree of mass unevenness during use is large, the threshold is lowered so that a lower mass deviation value can trigger the threshold, thus improving the judgment standard. When the fan speed is low, the mass is low, and the eccentricity caused by the same degree of mass unevenness during use is small, there is no need to react to the minor mass unevenness, thus lowering the threshold and reducing the judgment standard.

[0052] The wear-resistant plate recess is designed to match the bottom protrusion of the rotor shaft core 1. The inner surface is also spherical. When the spherical surface of the recess itself becomes eccentric, the matching degree with the rotor shaft core 1 decreases. When the spherical protrusion 11 of the rotor shaft core 1 is attached to the recess, the mismatch between the recess and the spherical protrusion 11 of the rotor shaft core 1 will still lead to the eccentric tendency based on the radial force of the rotor shaft core 1. At this time, it is even more necessary to ensure that the impact of the uneven mass of the fan blade 2 on the eccentricity is reduced. That is, it is necessary to further lower the threshold and improve the judgment standard for uneven mass of the blade. When the fan blade 2 has a less severe degree of uneven mass, step one also includes: measuring the eccentricity of the recess of the wear-resistant plate and correcting the deviation threshold according to the eccentricity of the recess.

[0053] Specifically, step one also includes: measuring the eccentricity of the recessed part of the wear-resistant plate to obtain the eccentricity P of the receiving cavity, and correcting the deviation threshold A by a factor of X, where X = 1 - P / R, R is the radius of the recessed part, and the eccentricity is the distance between the deepest part of the bottom of the receiving cavity and the axis of the rotor shaft 1.

[0054] When P is large, it means that the eccentricity is large. The eccentricity of the receiving cavity acts on the eccentric receiving cavity. At this time, it is necessary to further reduce the threshold and improve the judgment standard. At this time, the value of X = 1 - P / R is small, less than 1. When the deviation threshold A is corrected by X times, the threshold reduction when the eccentricity is large is completed.

[0055] By measuring the eccentricity of the recessed part of the wear-resistant sheet, and correcting the deviation threshold based on the eccentricity of the recessed part, the threshold is further reduced to improve the judgment standard when the wear-resistant sheet itself causes an eccentricity tendency before assembly is completed and it is necessary to improve the judgment standard for uneven blade quality.

[0056] Alternatively, X = -0.5log(10y+1)+1, y = P / R×d, where d is a pre-input correction coefficient. In this embodiment, d is 1000, 0≤P≤0.001R, and when P>0.001R, P = 0.001R is taken.

[0057] When the concave part begins to deviate from the core, the threshold needs to be reduced quickly to ensure that the impact of uneven fan blade mass on the deviating core is reduced. Since the function graph of X = -0.5log(10y+1)+1 has the characteristic that the function value drops rapidly in the first half of the range of P, X decreases rapidly as P decreases. When the deviation threshold A is corrected by a factor of X, the threshold is reduced quickly when the deviating core begins.

[0058] When the eccentricity of the recessed part approaches the upper limit of the value, it is further ensured that the impact of the uniformity of the fan blade 2 mass on the eccentricity correction is limited, and there is no need to quickly reduce the threshold. Since the function graph of X = -0.5log(10y+1)+1 has the characteristic that the function value in the second half decreases slowly within the range of P, X decreases slowly as P decreases. When the deviation threshold A is corrected by X times, the threshold is slowly reduced when the degree of eccentricity approaches the upper limit.

[0059] Working principle and usage process of this invention:

[0060] Before use, the fan will be tested to determine the mass deviation of the fan blades 2. Then, the weight balance block will be placed in the receiving slot 21 with the fan shaft center as the reference point, at the position opposite to the mass deviation.

[0061] Finally, align the lower spherical protrusion of the fan rotor shaft 1 with the wear-resistant plate 4 at the bottom of the shaft housing 3 for installation.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for manufacturing an optimized rotor rotational eccentric structure, characterized in that, The eccentric structure includes a housing, a rotor disposed within the housing, and a fan connected to the rotor. The rotor is rotatably disposed within the housing. From top to bottom, the rotor includes a rotor shaft, a wear-resistant plate, and a magnet. A spherical protrusion is formed on the lower part of the rotor shaft. The wear-resistant plate has a recessed portion that mates with the spherical protrusion. The fan is equipped with a weight counterweight. A lubricating oil receiving cavity is provided between the wear-resistant plate and the magnet. Annular receiving grooves are respectively formed on the upper and lower edges of the fan for accommodating the weight counterweight. The method includes the following steps: Step 1: Assemble the fan and prepare for testing; Step 2: Use a machine to check whether the quality deviation of the fan blades exceeds the deviation threshold. If the result is yes, proceed to step 3. If the result is no, it is considered qualified. Step 3: Using the fan blade axis as a reference line, set up a weight balance block in the opposite direction of the mass deviation direction, and return to Step 2; Step one further includes: setting the fan speed R and measuring the fan mass M, and calculating the deviation threshold A based on the fan speed and the measured fan mass, where A = R0 / R×M0 / M×A0, R0 is the pre-input standard speed, M0 is the pre-input standard weight, and A0 is the pre-input standard deviation threshold. Step one further includes: measuring the eccentricity of the recessed part of the wear-resistant sheet to obtain the eccentricity P of the receiving cavity, and correcting the deviation threshold A by a factor of X, where X = 1 - P / R, and R is the radius of the recessed part.

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