Rotation eccentric structure for optimizing rotor operation and manufacturing method thereof

Abstract

The invention relates to a rotating eccentric structure for optimizing rotor operation and a manufacturing method of the rotating eccentric structure, and belongs to the technical field of rotor production. The rotating eccentric structure for optimizing rotor operation comprises a shell, a rotor arranged in the shell and a fan connected with the rotor; the rotor is sequentially provided with a rotor shaft core, a wear-resisting plate and a magnet from top to bottom, a spherical surface bulge is formed at the lower part of the rotor shaft core, the wear-resisting plate is provided with a concave part matched with the spherical surface bulge, the fan is provided with a weight balance block, and the method comprises the following steps: step 1, assembling the fan and preparing for testing; and 2, detecting whether the quality deviation value of the fan blade exceeds a deviation threshold value or not through a machine, if not, executing the step 3, and if yes, determining that the fan blade is qualified. Thirdly, the axis of the fan blade serves as a reference line, a weight balance block is arranged in the opposite direction of the mass deviation direction, and the second step is executed again; the mass distribution can be measured, and the test accuracy is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of rotor production, and particularly relates to an optimized rotor operation rotation eccentric structure and its manufacturing method. Background Art

[0002] Fans, especially small fans, are the core heat dissipation components of various household appliances such as televisions and computers. They drive air flow or exhaust air through high-speed rotation. When the rotation structure of the fan, for example, the axis line of the rotor shaft core does not coincide with the axis line of the fixed structure, the rotor shaft core will always swing during the rotation process, reducing the service life. And after the fan rotates for a long time, there is a probability of wear. At this time, the fixed structure cannot fix the rotor shaft core well, further reducing the service life.

[0003] For this reason, it is necessary to perform an eccentricity test before assembling the fan, and then optimize the eccentricity structure. A typical test method, for example, a device for measuring the eccentricity of a screw pump rotor disclosed in CN210892979U, includes a measurement base, a depth gauge fixing seat fixedly installed on the measurement base, and a digital display depth gauge fixedly installed on the depth gauge fixing seat. It modifies the digital display depth gauge in the prior art and provides a device suitable for measuring the eccentricity of a screw pump rotor, which has the advantages of simple structure, low cost, and convenient operation, and is suitable for mass production and popularization.

[0004] However, in the above solution, there is no correction plan for the rotor structure given according to the test method, and the test only focuses on whether eccentricity has occurred, and cannot cope with the eccentricity that occurs after long-term rotation due to uneven self-weight of the rotation structure. The test is not highly targeted. Therefore, there is a need for an optimized rotor operation rotation eccentric structure and its manufacturing method that can measure mass distribution and has high test accuracy. Summary of the Invention

[0005] To solve the above problems existing in the prior art, the present invention provides an optimized rotor operation rotation eccentric structure and its manufacturing method, which has the characteristics of being able to measure mass distribution and having high test accuracy.

[0006] The object of the present invention can be achieved by the following technical solutions:

[0007] An optimized 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 sequentially 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.

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

[0009] As a preferred technical solution of the present invention, annular receiving grooves are respectively formed on the upper edge and the lower edge of the fan, and the receiving grooves are used to receive weight balance blocks.

[0010] A manufacturing method for optimizing the rotating eccentric structure of a rotor, applicable to the above-mentioned optimized rotating eccentric structure of a rotor, further includes the following steps:

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

[0012] Step 2: Use a machine to detect whether the quality 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.

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

[0014] As a preferred technical solution of the present invention, Step 1 further includes: setting the rotation speed of the fan and measuring the mass of the fan, and calculating the deviation threshold according to the rotation speed of the fan and the measured mass of the fan.

[0015] As a preferred technical solution of the present invention, Step 1 further includes: setting the rotation speed R of the fan and measuring the mass M of the fan, and calculating the deviation threshold A according to the rotation speed of the fan and the measured mass of the fan, where A = R0 / R × M0 / M × A0, R0 is the pre-input standard rotation speed, M0 is the pre-input standard weight, and A0 is the pre-input standard deviation threshold.

[0016] As a preferred technical solution of the present invention, Step 1 further includes: measuring the eccentricity of the concave part of the wear-resistant piece, and correcting the deviation threshold according to the eccentricity of the concave part.

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

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

[0019] (1) By providing a spherical surface protrusion below the rotor shaft core and cooperating with a concave part under the spherical surface protrusion directly below the rotor shaft core, the spherical surface protrusion at the lower end of the rotor shaft core is embedded in the concave part to complete the fixation of the rotor shaft core, reducing the probability of eccentricity of the rotor shaft core;

[0020] (2) Detect whether the quality deviation value of the fan blade exceeds the deviation threshold through a machine, and set a weight balance block in the opposite direction of the quality deviation direction to complete the detection and correction of the quality deviation of the fan blade part, reduce the eccentric tendency caused by long-term rotation, improve the test accuracy, and correct according to the test results;

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

[0022] (4) By calculating the deviation threshold according to the rotation speed of the fan and measuring the fan quality, when the fan has a high rotation speed, a large mass, and a large eccentric tendency caused by the same degree of mass unevenness during use, the threshold is reduced, so that a lower quality deviation value can trigger the threshold, improving the judgment standard. When the fan has a low rotation speed, a low mass, and a small eccentric tendency caused by the same degree of mass unevenness during use, there is no need to react to the relatively light mass unevenness, and the threshold is reduced to lower the judgment standard;

[0023] (5) By measuring the eccentricity of the concave part of the wear-resistant piece and correcting the deviation threshold according to the eccentricity of the concave part, before the assembly is completed, when the wear-resistant piece itself causes an eccentric tendency and it is necessary to improve the judgment standard for the unevenness of the blade quality, the judgment standard is further improved. Brief Description of the Drawings

[0024] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

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

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

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

[0028] Main Element Symbol Description:

[0029] In the figure: 1, rotor shaft core; 11, spherical protrusion; 2, fan blade; 21, accommodation groove; 3, housing; 4, wear-resistant plate; 41, lubricating oil accommodation cavity; 5, magnet. Detailed Embodiments

[0030] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following will, with reference to the accompanying drawings and preferred embodiments, describe in detail the specific embodiments, structures, features, and their effects according to the present invention.

[0031] Please refer to Figures 1-3, An optimized rotating eccentric structure for a rotor, comprising 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 successively includes a rotor shaft core 1, a wear-resistant plate 4, and a magnet 5 from top to bottom. A spherical surface protrusion is formed at the lower part of the rotor shaft core 1. The wear-resistant plate 4 is provided with a recess corresponding to the spherical surface protrusion. The fan is provided with a weight balance block;

[0032] Specifically, an axis accommodation cavity is provided at the center of the housing 3. The axis accommodation cavity is cylindrical. An oil-containing bearing is provided in the axis accommodation cavity. The rotor shaft core 1 is provided in the oil-containing bearing. The outer side of the oil-containing bearing is in rolling fit with the inner wall of the axis accommodation cavity, and the inner side is in rolling fit with the rotor shaft core 1;

[0033] A groove is opened at the bottom of the axis accommodation cavity. A strong magnet 5 is provided at the bottom of the groove. The wear-resistant plate 4 is provided on the top surface of the strong magnet 5;

[0034] A spherical surface protrusion 11 protrudes from the bottom of the rotor shaft core 1. The lower end of the column of the rotor shaft core 1 converges inward, and thus a mushroom-shaped structure is formed at the bottom of the rotor shaft core 1. The spherical surface protrusion 11 at the bottom of the rotor shaft core 1 abuts against the wear-resistant plate 4. The part of the wear-resistant plate 4 in contact with the bottom of the rotor shaft core 1 forms a recess for accommodating the spherical surface protrusion 11;

[0035] When the rotor shaft core 1 has a tendency of eccentric movement, pressure is applied to the inner wall of the recess 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 providing a spherical surface protrusion below the rotor shaft core 1 and providing a recess corresponding to the spherical surface protrusion 11 directly below the rotor shaft core 1, the spherical surface protrusion 11 at the lower end of the rotor shaft core 1 is embedded in the recess, completing the fixation of the rotor shaft core 1 and reducing the probability of eccentricity of the rotor shaft core 1;

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

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

[0039] When the fan rotates, lubricating oil needs to be replenished at all times. At this time, by providing a lubricating oil accommodation cavity 41 between the wear-resistant plate 4 and the magnet 5, the gap formed by the additionally provided structure is utilized to improve the lubricating oil replenishing ability, and thus the operating efficiency is improved;

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

[0041] In actual production, there is a probability that the quality of the fan itself is uneven. During long-term rotation, the uneven quality forms a local centrifugal force, driving the fan to have an eccentric tendency. Therefore, it is necessary to detect the degree of uneven quality and place weight balance blocks at positions of the fan far from the axis line according to the uneven quality. For the convenience of placing the weight balance blocks, annular receiving grooves 21 are respectively formed on the upper and lower edges of the fan, and the receiving grooves 21 are used to receive the weight balance blocks; specifically, the annular receiving grooves 21 are arranged around the rotating shaft.

[0042] A manufacturing method for optimizing the rotation eccentric structure of a rotor, characterized in that it is applicable to the above-mentioned optimized rotation eccentric structure of a rotor, and further includes the following steps:

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

[0044] Step 2: Use a machine to detect whether the quality deviation value of the fan blade 2 exceeds the deviation threshold. When the judgment result is no, execute Step 3. When the judgment result is yes, it is regarded as qualified.

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

[0046] By using a machine to detect whether the quality deviation value of the fan blade 2 exceeds the deviation threshold and setting a weight balance block in the opposite direction of the quality deviation direction, the quality deviation detection and correction of the fan blade 2 part are completed, reducing the eccentric tendency caused by long-term rotation, improving the test accuracy, and correcting according to the test result;

[0047] Under different states, the detection standards of the fan are different. For example, when the fan has a large mass and a high rotational speed, the same mass unevenness has a greater centrifugal tendency, which will cause more serious consequences. At this time, it is necessary to lower the threshold value so that a lower quality deviation value can trigger the threshold. When the fan has a low rotational speed and a low mass, and the eccentric tendency brought by the same degree of mass unevenness during use is small, there is no need to respond to the less severe mass unevenness, and the threshold value is increased to improve the detection efficiency. Step 1 further includes: setting the rotational speed of the fan and measuring the mass of the fan, and calculating the deviation threshold according to the rotational speed of the fan and measuring the mass of the fan.

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

[0049] When the mass M of the fan is large or the rotational speed R is large, the threshold needs to be lowered. 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 has a large mass or a large rotational speed.

[0050] Similarly, when the mass M of the fan is small or the rotational 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 increase is completed.

[0051] By calculating the deviation threshold according to the rotational speed of the fan and measuring the mass of the fan, when the rotational speed of the fan is high, the mass is large, and the eccentricity trend 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, improving the judgment standard. When the rotational speed of the fan is low, the mass is low, and the eccentricity trend caused by the same degree of mass unevenness during use is small, there is no need to respond to the relatively light mass unevenness, and the threshold is lowered, reducing the judgment standard.

[0052] The concave part of the wear-resistant piece is arranged in cooperation with the protruding part at the bottom of the rotor shaft core 1, and the inner surface is also spherical. When the spherical surface of the concave part itself is eccentric, the matching degree with the rotor shaft core 1 is reduced. When the spherical protrusion 11 of the rotor shaft core 1 is fitted to the concave part, the mismatched part between the concave part and the spherical protrusion 11 of the rotor shaft core 1 will still cause an eccentricity trend based on the force in the radial direction of the rotor shaft core 1. At this time, it is more necessary to ensure reducing the influence of the uneven mass of the fan blade 2 on eccentricity, that is, it is necessary to further lower the threshold and improve the judgment standard for the uneven mass of the blade. When the fan blade 2 has a lighter degree of uneven mass, for this reason, step one further includes: measuring the eccentricity of the concave part of the wear-resistant piece and correcting the deviation threshold according to the eccentricity of the concave part.

[0053] Specifically, step one further includes: measuring the eccentricity of the concave part of the wear-resistant piece to obtain the eccentricity P of the accommodation cavity, and correcting the deviation threshold A by X times, where X = 1 - P / R, R is the radius of the concave part, and the eccentricity is the distance from the deepest part at the bottom of the accommodation cavity to the axis line of the rotor shaft core 1.

[0054] When P is large, it means that the eccentricity is large, and the eccentric accommodation cavity acts on the eccentric accommodation cavity. At this time, it is necessary to further lower the threshold to 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 concave part of the wear-resistant piece and correcting the deviation threshold according to the eccentricity of the concave part, before the assembly is completed, when the wear-resistant piece itself causes an eccentric trend and it is necessary to improve the judgment standard for the uneven quality of the blade, the threshold value is further reduced to improve the judgment standard;

[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. When P > 0.001R, P = 0.001R is taken.

[0057] When the concave part starts to be eccentric, it is necessary to quickly reduce the threshold value to ensure that the influence of the uneven quality of the fan blade 2 on the eccentricity is reduced. Since the function image feature of X = -0.5log(10y + 1) + 1 is that in the range of P values, the function value drops rapidly in the first half. At this time, X decreases rapidly as P decreases. When the deviation threshold A is corrected by X times, the threshold value is quickly reduced when starting to be eccentric;

[0058] When the eccentricity of the concave part approaches the upper limit of the value range, to further ensure that the influence of the quality uniformity of the fan blade 2 on the eccentricity correction is limited and there is no need to quickly reduce the threshold value. Since the function image feature of X = -0.5log(10y + 1) + 1 is that in the range of P values, the function value drops slowly in the second half. At this time, X decreases slowly as P decreases. When the deviation threshold A is corrected by X times, the threshold value is slowly reduced when the eccentricity degree approaches the upper limit;

[0059] The working principle and usage process of the present invention:

[0060] Before use, first test the fan to obtain the quality deviation value of the fan blade 2. Then place the weight balance block in the receiving groove 21 at the position in the opposite direction of the quality deviation with the fan axis as the reference point;

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

[0062] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or decorations equivalent to changes within the scope of the technical solution of the present invention without departing from the technical solution of the present invention. However, any brief modification, equivalent change and decoration made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An optimized rotating eccentric structure for rotor operation, characterized in that: It includes a housing, a rotor disposed in the housing, and a fan connected to the rotor. The rotor is rotatably disposed in the housing and includes a rotor shaft core, a wear-resistant plate, and a magnet arranged in sequence from top to bottom. A spherical surface protrusion is formed at the lower part of the rotor shaft core, and a recess is provided on the wear-resistant plate to cooperate with the spherical surface protrusion. The fan is provided with weight balance blocks.

2. An optimized rotor running rotary eccentric structure according to claim 1, characterized in that: A lubricating oil accommodating cavity is provided between the wear-resistant plate and the magnet.

3. An optimized rotor running rotary eccentric structure according to claim 2, characterized in that: Circular accommodating grooves are respectively formed at the upper edge and the lower edge of the fan, and the accommodating grooves are used to accommodate the weight balance blocks.

4. A manufacturing method for optimizing the rotating eccentric structure of a rotor, characterized in that, For an optimized rotor operation rotation eccentricity structure according to any one of claims 2 to 3, the following steps are further included: 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. If the judgment result is no, go to Step 3; if 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.

5. A manufacturing method of an optimized rotor running rotation eccentric structure according to claim 4, characterized in that, Step 1 further includes: setting the rotation speed of the fan and measuring the mass of the fan, and calculating the deviation threshold according to the rotation speed of the fan and the measured mass of the fan.

6. The manufacturing method of an optimized rotor running rotary eccentric structure according to claim 4, characterized in that, Step 1 further includes: setting the rotation speed R of the fan and measuring the mass M of the fan, and calculating the deviation threshold A according to the rotation speed of the fan and the measured mass of the fan, where A = R0 / R × M0 / M × A0, R0 is a pre-input standard rotation speed, M0 is a pre-input standard weight, and A0 is a pre-input standard deviation threshold.

7. A manufacturing method for optimizing the rotating eccentric structure of a rotor according to claim 4, characterized in that, Step 1 further includes: measuring the eccentricity of the recess of the wear-resistant sheet and correcting the deviation threshold according to the eccentricity of the recess.

8. A manufacturing method of an optimized rotor running rotary eccentric structure according to claim 4, characterized in that Step 1 further includes: measuring the eccentricity of the recess of the wear-resistant sheet to obtain the eccentricity P of the accommodating cavity, and correcting the deviation threshold A by X times, where X = 1 - P / R, and R is the radius of the recess.

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