Method for testing performance of hydrodynamic sliding bearing, x-ray tube

Abstract

The application relates to a performance detection method of a dynamic pressure sliding bearing and an X-ray tube. The performance detection method of the dynamic pressure sliding bearing comprises the following steps: obtaining standard data of a preset dynamic pressure sliding bearing sliding under a non-powered state; obtaining measured data of a to-be-detected dynamic pressure sliding bearing sliding under the non-powered state; and determining a performance parameter of the to-be-detected dynamic pressure sliding bearing according to the standard data and the measured data. In this way, the performance of the dynamic pressure sliding bearing can be monitored by an operator, so that the use performance of the dynamic pressure sliding bearing can be learned in a timely manner, and the normal use of the X-ray tube can be prevented from being affected due to the performance decline of the dynamic pressure sliding bearing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical instrument monitoring, in particular to a performance detection method of a dynamic pressure sliding bearing and an X-ray tube. BACKGROUND

[0002] The X-ray tube plays an important role in various fields such as medical diagnosis, security inspection and non-destructive testing. When the X-ray tube is working, a hot electron cloud is generated around the cathode filament. Under the action of high voltage between the cathode and the anode, the electrons in the hot electron cloud fly to the anode at high speed and hit the anode target disc. The high-speed moving electrons interact with the atoms of the target disc material to generate X-rays. Among them, only about 1% of the energy is converted into X-rays, and the remaining 99% of the energy is converted into heat and deposited on the anode target disc. Part of the heat on the anode target disc is radiated to the outside of the X-ray tube through thermal radiation, and the other part of the heat is conducted to the outside of the X-ray tube through the rotor and the dynamic pressure sliding bearing.

[0003] However, after the dynamic pressure sliding bearing is operated for a long time, the wear of the bearing and the oxidation of the liquid metal are easy to cause changes in the performance of the bearing. Therefore, how to monitor the performance status of the bearing becomes a problem to be solved. SUMMARY

[0004] Therefore, it is necessary to provide a performance detection method of a dynamic pressure sliding bearing and an X-ray tube aiming at the above problems.

[0005] In a first aspect, the present application provides a performance detection method of a dynamic pressure sliding bearing, which comprises:

[0006] obtaining standard data of a preset dynamic pressure sliding bearing sliding in a non-powered state;

[0007] obtaining measured data of a to-be-detected dynamic pressure sliding bearing sliding in a non-powered state;

[0008] determining a performance parameter of the to-be-detected dynamic pressure sliding bearing according to the standard data and the measured data.

[0009] In one embodiment, the step of obtaining the standard data of the preset dynamic pressure sliding bearing sliding in the non-powered state comprises:

[0010] obtaining a standard interval time corresponding to a preset speed segment of the preset dynamic pressure sliding bearing.

[0011] In one embodiment, the step of obtaining the measured data of the to-be-detected dynamic pressure sliding bearing sliding in the non-powered state comprises:

[0012] obtaining a measured interval time corresponding to the preset speed segment of the to-be-detected dynamic pressure sliding bearing;

[0013] The step of determining the performance parameter of the dynamic pressure sliding bearing to be detected according to the standard data and the measured data comprises:

[0014] The performance parameter of the dynamic pressure sliding bearing to be detected is determined according to the standard interval time and the measured interval time; in the case that the measured interval time is less than the standard interval time, it is determined that the performance parameter of the liquid metal bearing to be detected is less than a preset performance threshold.

[0015] In one of the embodiments, the step of obtaining the standard data of the preset dynamic pressure sliding bearing sliding in a non-powered state comprises:

[0016] The standard interval time corresponding to each of a plurality of sub preset speed segments of the preset dynamic pressure sliding bearing is obtained; wherein the speed range of each of the sub preset speed segments is different.

[0017] In one of the embodiments, the step of obtaining the measured data of the dynamic pressure sliding bearing to be detected sliding in a non-powered state comprises:

[0018] The measured interval time corresponding to each of a plurality of sub preset speed segments of the dynamic pressure sliding bearing to be detected is obtained;

[0019] The step of determining the performance parameter of the dynamic pressure sliding bearing to be detected according to the standard data and the measured data comprises:

[0020] The performance parameter of the dynamic pressure sliding bearing to be detected is determined according to the standard interval time and the measured interval time of each of the sub preset speed segments; wherein in the case that the measured interval time of any of the sub preset speed segments is less than the standard interval time of the sub preset speed segment, it is determined that the performance parameter of the liquid metal bearing to be detected is less than a preset performance threshold.

[0021] In one of the embodiments, the speed difference of each of the sub preset speed segments in the plurality of sub preset speed segments is equal, and the speed range of each of the sub preset speed segments decreases by a preset step length in turn.

[0022] In one of the embodiments, the step of obtaining the standard data of the preset dynamic pressure sliding bearing sliding in a non-powered state comprises:

[0023] A first relationship curve between the speed and time of the preset dynamic pressure sliding bearing is obtained;

[0024] A standard speed mutation value is determined according to the first relationship curve.

[0025] In one of the embodiments, the step of obtaining the measured data of the dynamic pressure sliding bearing to be detected sliding in a non-powered state comprises:

[0026] obtaining a second relationship curve of the rotation speed and time of the dynamic pressure sliding bearing to be detected;

[0027] determining an actual rotation speed mutation value according to the second relationship curve;

[0028] The step of determining the performance parameter of the dynamic pressure sliding bearing to be detected according to the standard data and the actual data comprises:

[0029] determining the performance parameter of the dynamic pressure sliding bearing to be detected according to the standard rotation speed mutation value and the actual rotation speed mutation value; wherein, in the case that the actual rotation speed mutation value is greater than the standard rotation speed mutation value, it is determined that the performance parameter of the liquid metal bearing to be detected is less than a preset performance threshold.

[0030] The performance detection method of the dynamic pressure sliding bearing provided in the application determines the performance parameter of the dynamic pressure sliding bearing to be detected according to the standard data of the preset dynamic pressure sliding bearing in the unpowered state and the actual data of the dynamic pressure sliding bearing to be detected in the unpowered state. In this way, the operator can monitor the performance of the dynamic pressure sliding bearing, so as to timely understand the use performance of the dynamic pressure sliding bearing and avoid affecting the normal use of the X-ray tube due to the performance decline of the dynamic pressure sliding bearing.

[0031] In a second aspect, the application provides an X-ray tube, comprising:

[0032] a dynamic pressure sliding bearing comprising a mandrel and a bearing sleeve sleeved on the mandrel, and a liquid metal being arranged between the mandrel and the bearing sleeve;

[0033] a target disc arranged on the bearing sleeve;

[0034] a driving assembly comprising a rotor and a stator winding sleeved on the rotor; the rotor is sleeved on the mandrel and connected with the bearing sleeve;

[0035] a detection member for obtaining the rotation speed of the bearing sleeve.

[0036] In one embodiment, the detection member is a rotation speed sensor.

[0037] Alternatively, the detection member is an electromagnetic detection member for detecting the induced electromotive force on the stator winding.

[0038] The X-ray tube provided in the application comprises a detection member for obtaining the rotation speed of the bearing sleeve. In this way, the operator can detect the rotation speed of the bearing sleeve in the unpowered state, so as to timely understand the use performance of the dynamic pressure sliding bearing and avoid affecting the normal use of the X-ray tube due to the performance decline of the dynamic pressure sliding bearing. BRIEF DESCRIPTION OF DRAWINGS

[0039] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic flowchart of a performance testing method for a hydrodynamic sliding bearing provided in an embodiment of this application.

[0041] Figure 2 This is another schematic flowchart illustrating a performance testing method for a hydrodynamic sliding bearing provided in an embodiment of this application.

[0042] Figure 3 This is another schematic flowchart of a performance testing method for a hydrodynamic sliding bearing provided in an embodiment of this application.

[0043] Figure 4 for Figure 1 A flowchart of S110 in the method shown.

[0044] Figure 5 for Figure 1 A flowchart of S120 in the method shown.

[0045] Figure 6 This is a schematic diagram of the structure of an X-ray tube provided in an embodiment of this application.

[0046] Figure 7 This is a schematic diagram of another X-ray tube provided in an embodiment of this application.

[0047] Explanation of reference numerals in the attached figures:

[0048] 10. X-ray tube; 11. Hydrodynamic sliding bearing; 111. Mandrel; 112. Bearing sleeve; 113. Liquid metal; 12. Target disk; 13. Drive assembly; 131. Rotor; 132. Stator coil; 14. Detection component; 15. Connecting ring. Detailed Implementation

[0049] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0050] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0054] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0055] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, in this specification, the term “and / or” includes any and all combinations of the associated listed items.

[0056] Firstly, referring to Figure 1 As shown in the embodiment of this application, a performance testing method for a hydrodynamic sliding bearing is provided, which includes:

[0057] S110: Obtain standard data on the sliding motion of a preset hydrodynamic sliding bearing in a non-powered state.

[0058] It should be noted here that "preset hydrodynamic sliding bearing" refers to a hydrodynamic sliding bearing in normal operating condition. In one example, the preset hydrodynamic sliding bearing could be the hydrodynamic sliding bearing as it was when it left the factory. "Standard data" refers to the test data of the preset hydrodynamic sliding bearing under no-power conditions.

[0059] Understandably, referring to Figure 6 As shown, the hydrodynamic sliding bearing 11 generally includes a spindle 111 and a bearing sleeve 112 sleeved on the spindle 111, with liquid metal 113 disposed between the spindle 111 and the bearing sleeve 112. The target disk 12 is typically mounted on the bearing sleeve 112, which rotates under the drive of the drive assembly 13. Specifically, the drive assembly 13 includes a stator coil 132 and a rotor 131. The rotor 131 is connected to the bearing sleeve 112, and the stator coil 132 drives the rotor 131 to rotate via electromagnetic force.

[0060] Generally, during normal operation, the stator coil 132 generates electromagnetic force to drive the rotor 131 to rotate. The rotor 131 drives the bearing sleeve 112 to rotate, and the bearing sleeve 112 drives the target disk 12 to rotate. In this embodiment, the no-power state refers to the situation where, during the rotation of the rotor 131 and the bearing sleeve 112, the stator coil 132 is de-energized, so that the stator coil 132 does not generate electromagnetic force. In this way, the stator coil 132 does not drive the rotor 131 to rotate, and the rotor 131 and the bearing sleeve 112 rotate under the action of inertial force. It can be understood that, due to the existence of friction, the rotational speed of the rotor 131 and the bearing sleeve 112 gradually decreases until the rotational speed becomes zero.

[0061] S120: Obtain the measured data of the sliding motion of the hydrodynamic sliding bearing under test in a non-powered state.

[0062] It should be noted here that the term "hydrodynamic sliding bearing to be tested" refers to a hydrodynamic sliding bearing whose performance needs to be tested after a period of use. "Measured data" refers to the test data of the hydrodynamic sliding bearing under no-power conditions.

[0063] It should be noted that when testing the parameters of the hydrodynamic sliding bearing (the preset hydrodynamic sliding bearing and the hydrodynamic sliding bearing to be tested), the hydrodynamic sliding bearing can be brought to the first preset speed first, and then the stator coil can be de-energized to put the hydrodynamic sliding bearing in a powerless state.

[0064] In one embodiment, the first preset speed can be in the range of 5000-15000 r / min. Specifically, the first preset speed can be 5000 r / min, 6000 r / min, 8000 r / min, 10000 r / min, 13000 r / min or 15000 r / min.

[0065] For example, when testing the parameters of a hydrodynamic sliding bearing, the bearing speed can first be increased to 15000 r / min, and then the stator coil can be de-energized, placing the bearing in a powerless state, i.e., the bearing sleeve rotates under the action of inertial force. In this way, the speed of the hydrodynamic sliding bearing in the powerless state gradually decreases from 15000 r / min until it reaches zero. By allowing the hydrodynamic sliding bearing to reach a first preset speed, the time it slides in the powerless state is sufficiently long, facilitating the testing of its parameters.

[0066] S130: Determine the performance parameters of the hydrodynamic sliding bearing to be tested based on standard data and measured data.

[0067] It should be noted here that the performance parameter can be the damping performance of the hydrodynamic sliding bearing. When all components of the hydrodynamic sliding bearing are in normal condition, the damping performance is within a preset range. When adverse conditions occur in the components of the hydrodynamic sliding bearing, the damping performance deviates from the preset range. For example, wear or scratches between the bearing sleeve and the spindle, or oxidation of the liquid metal, will affect the damping performance of the hydrodynamic sliding bearing, causing it to deviate from the preset range. Therefore, by determining the damping performance of the hydrodynamic sliding bearing, the performance characteristics of the hydrodynamic sliding bearing can be obtained in this embodiment of the application.

[0068] In one example, the performance parameters of the hydrodynamic sliding bearing under test can be determined by comparing the values ​​of standard data and measured data. For instance, if the measured data value is greater than the standard data value, the performance of the hydrodynamic sliding bearing under test is considered poor, and it needs to be replaced. If the measured data value is less than or equal to the standard data value, the performance of the hydrodynamic sliding bearing under test is considered good, and it can continue to be used.

[0069] In another example, the standard data is a numerical range, and the measured data is a specific value. The performance parameters of the hydrodynamic sliding bearing under test are determined by judging whether the measured data falls within the range of the standard data. For example, if the measured data falls within the range of the standard data, the hydrodynamic sliding bearing under test is considered to have good performance and can continue to be used. If the measured data is outside the range of the standard data, the hydrodynamic sliding bearing under test is considered to have poor performance and needs to be replaced.

[0070] The performance testing method for hydrodynamic sliding bearings provided in this application determines the performance parameters of the bearing under test based on preset standard data of the hydrodynamic sliding bearing in a non-powered state and measured data of the bearing under test in the same state. This facilitates operator monitoring of the bearing's performance, allowing for timely understanding of its performance characteristics. When the bearing's performance is poor, operators can take immediate intervention measures, such as replacing the bearing, to prevent further deterioration and ensure the normal operation of the X-ray tube.

[0071] In one embodiment, reference Figure 2 As shown, S110: The step of obtaining standard data on the sliding motion of a preset hydrodynamic sliding bearing in a powerless state includes:

[0072] S111: Obtain the standard interval time corresponding to the preset dynamic pressure sliding bearing in the preset speed range.

[0073] It should be noted here that the preset speed range refers to the sliding segment of a hydrodynamic sliding bearing between a certain high speed and a certain low speed during sliding. For example, the preset speed range could be the sliding segment from 1000 r / min to 500 r / min. The time elapsed during this sliding segment is the standard interval time corresponding to the preset speed range.

[0074] In one embodiment, the standard interval time is a specific numerical value. Specifically, in one example, to obtain the standard interval time, multiple measurements can be performed on the same preset hydrodynamic sliding bearing to obtain multiple interval time values, and the average value of all interval time values ​​is calculated; this average value is the standard interval time. In another example, to obtain the standard interval time, multiple preset hydrodynamic sliding bearings of the same series can be measured separately to obtain multiple interval time values, and the average value of all interval time values ​​is calculated; this average value is the standard interval time.

[0075] In another embodiment, the standard interval time is a numerical range. Specifically, in one example, when obtaining the standard interval time, multiple measurements can be performed on the same preset hydrodynamic sliding bearing to obtain multiple interval time values, wherein the maximum and minimum interval times constitute the endpoints of the numerical range of the standard interval time. In another example, when obtaining the standard interval time, multiple preset hydrodynamic sliding bearings of the same series can be measured separately to obtain multiple interval time values, wherein the maximum and minimum interval times constitute the endpoints of the numerical range of the standard interval time. It is understood that setting the standard interval time as a numerical range can improve the accuracy of performance testing.

[0076] In one embodiment, reference Figure 2 As shown, S120: The step of obtaining the measured data of the sliding motion of the hydrodynamic sliding bearing under test in a powerless state includes:

[0077] S121: Obtain the measured interval time corresponding to the preset speed range of the hydrodynamic sliding bearing to be tested.

[0078] It should be noted that in one example, the measured interval time is obtained by measuring the hydrodynamic sliding bearing only once. In another example, the measured interval time is obtained by measuring multiple times and averaging the values ​​of the multiple measurements. This average value is the measured interval time.

[0079] S130: The steps for determining the performance parameters of the hydrodynamic sliding bearing to be tested based on standard data and measured data include:

[0080] S131: Determine the performance parameters of the hydrodynamic sliding bearing to be tested based on the standard interval time and the measured interval time. If the measured interval time is less than the standard interval time, determine that the performance parameters of the liquid metal bearing to be tested are less than the preset performance threshold.

[0081] It should be noted that the preset performance threshold means that all components of the liquid metal bearing are in a normal state and can perform normal operation.

[0082] Specifically, when the standard interval time is a specific value, the measured interval time and the standard interval time are compared. If the measured interval time is less than the standard interval time, the performance of the hydrodynamic sliding bearing under test is judged to be relatively poor, and the components are severely aged. If the measured interval time is greater than or equal to the standard interval time, the performance of the hydrodynamic sliding bearing under test is judged to be relatively good.

[0083] When the standard interval time is within a certain range, the performance parameters of the hydrodynamic sliding bearing under test are determined by judging whether the measured interval time falls within the range of the standard interval time. If the measured interval time falls within the range of the standard interval time, the performance of the hydrodynamic sliding bearing under test is considered to be good. If the measured interval time is less than the range of the standard interval time, the performance of the hydrodynamic sliding bearing under test is considered to be poor, and the components are considered to be severely aged.

[0084] In one embodiment, reference Figure 3 As shown, S110: The step of obtaining standard data on the sliding motion of a preset hydrodynamic sliding bearing in a powerless state includes:

[0085] S112: Obtain the standard interval time corresponding to the preset hydrodynamic sliding bearing in multiple sub-preset speed ranges. The speed range of each sub-preset speed range is different.

[0086] This is equivalent to obtaining the standard interval time corresponding to different sub-preset speed ranges of the preset hydrodynamic sliding bearing, that is, making the data sample range of the standard data wider and the data more abundant, thereby improving the accuracy of performance testing.

[0087] It should be noted here that the sub-preset speed range refers to the sliding segment of a hydrodynamic sliding bearing between a certain high speed and a certain low speed during sliding. For example, the sub-preset speed range could be the sliding segment from 1000 r / min to 500 r / min. The time experienced during this sliding segment is the standard interval time corresponding to that sub-preset speed range.

[0088] In one embodiment, the standard interval time is a specific numerical value, which can be obtained in the following way:

[0089] In one example, to obtain the standard interval time corresponding to the same sub-preset speed range, multiple measurements can be performed on the same preset hydrodynamic sliding bearing to obtain multiple interval time values. The average value of all interval time values ​​is then calculated, and this average value is the standard interval time. In another example, to obtain the standard interval time corresponding to the same sub-preset speed range, multiple preset hydrodynamic sliding bearings of the same series can be measured separately to obtain multiple interval time values. The average value of all interval time values ​​is then calculated, and this average value is the standard interval time.

[0090] In another embodiment, the standard interval time is a numerical range, which can be obtained in the following way:

[0091] In one example, when obtaining the standard interval time corresponding to the same sub-preset speed range, multiple measurements can be performed on the same preset hydrodynamic sliding bearing to obtain multiple interval time values. The maximum and minimum interval times constitute the endpoints of the standard interval time's numerical range. In another example, when obtaining the standard interval time corresponding to the same sub-preset speed range, multiple preset hydrodynamic sliding bearings of the same series can be measured separately to obtain multiple interval time values. The maximum and minimum interval times constitute the endpoints of the standard interval time's numerical range. It is understandable that setting the standard interval time as a numerical range can improve the accuracy of performance testing.

[0092] In one embodiment, S120: the step of acquiring measured data of the sliding motion of the hydrodynamic sliding bearing under test in a powerless state includes:

[0093] S122: Obtain the measured interval time corresponding to the hydrodynamic sliding bearing under test in multiple sub-preset speed ranges.

[0094] It should be noted that, in one example, when obtaining the measured interval time corresponding to a preset speed range, the hydrodynamic sliding bearing under test only needs to be tested once to obtain the measured interval time. In another example, when obtaining the measured interval time corresponding to a preset speed range, multiple tests are performed, and the average value of the multiple measurement results is calculated. This average value is the measured interval time corresponding to the preset speed range.

[0095] S130: The steps for determining the performance parameters of the hydrodynamic sliding bearing to be tested based on standard data and measured data include:

[0096] S132: Determine the performance parameters of the hydrodynamic sliding bearing to be tested based on the standard interval time and the measured interval time of each sub-preset speed segment. Where the measured interval time of any sub-preset speed segment is less than the standard interval time of that sub-preset speed segment, the performance parameters of the liquid metal bearing to be tested are determined to be less than a preset performance threshold.

[0097] Specifically, the standard interval time and the measured interval time of each sub-preset speed segment are compared. If the measured interval time of any sub-preset speed segment is less than the standard interval time, the performance parameters of the liquid metal bearing under test are determined to be less than the preset performance threshold. Otherwise, the performance of the liquid metal bearing under test is determined to meet the performance requirements.

[0098] Specifically, when comparing the standard interval time and the measured interval time of a certain sub-preset speed range, the following methods can be adopted:

[0099] When the standard interval time is a specific value, the measured interval time and the standard interval time are compared. If the measured interval time is less than the standard interval time, the performance of the hydrodynamic sliding bearing under test is determined to be poor, and the components are severely aged. If the measured interval time is greater than or equal to the standard interval time, the hydrodynamic sliding bearing under test is determined to meet the performance requirements within the preset speed range.

[0100] When the standard interval time is within a certain range, the performance parameters of the hydrodynamic sliding bearing under test are determined by judging whether the measured interval time falls within the range of the standard interval time. If the measured interval time falls within the range of the standard interval time, the hydrodynamic sliding bearing under test is determined to meet the performance requirements at the preset speed range. If the measured interval time is less than the range of the standard interval time, the performance of the hydrodynamic sliding bearing under test is determined to be poor, and the components are severely aged.

[0101] In one embodiment, the speed difference between each of the multiple sub-preset speed segments is equal, and the speed range of each sub-preset speed segment decreases sequentially according to a preset step size.

[0102] Specifically, this application uses specific numerical examples to illustrate the speed range and preset step size. Assume that three sub-preset speed ranges need to be measured: a first sub-preset speed range, a second sub-preset speed range, and a third sub-preset speed range. The speed range of the first sub-preset speed range is 5000-4500 r / min, the speed range of the second sub-preset speed range is 4000-3500 r / min, and the speed range of the third sub-preset speed range is 3000-2500 r / min. The speed range of the first, second, and third sub-preset speed ranges is 500 r / min, the step size between the first and second sub-preset speed ranges is 500 r / min, and the step size between the second and third sub-preset speed ranges is 500 r / min.

[0103] This application embodiment improves the accuracy of performance testing by making the speed range of each sub-preset speed segment decrease sequentially according to a preset step size, so that the distribution of all sub-preset speed segments is more uniform.

[0104] In one embodiment, all sub-preset speed ranges can be located within a preset speed range. The highest speed within this preset speed range is the second preset speed, and the lowest speed is the third preset speed. In one example, the second preset speed range is between 9600-10800 r / min, meaning the specific value of the second preset speed can be selected within this range based on actual conditions. The third preset speed range is between 2400-3600 r / min, meaning the specific value of the third preset speed can be selected within this range based on actual conditions.

[0105] In a specific example, the second preset speed is 10000 r / min, the third preset speed is 3000 r / min, then the preset speed range is 10000-3000 r / min. The first sub-preset speed range is 9000-8000 r / min, the second sub-preset speed range is 7000-6000 r / min, and the third sub-preset speed range is 5000-4000 r / min.

[0106] It should be noted that by ensuring all sub-preset speed ranges are within the preset speed range, and that the highest and lowest speeds within the preset speed range are respectively within the aforementioned ranges, the distribution of the sub-preset speed ranges can be made more reasonable and closer to actual operating conditions, thereby improving the accuracy of performance testing.

[0107] In one embodiment, the preset step size is a first value, the difference between the second preset rotation speed and the third preset rotation speed is a second value, and the ratio of the first value to the second value is between 0.05 and 0.5, that is, the ratio of the first value to the second value is within the above range.

[0108] Specifically, this application uses specific numerical values ​​as examples to illustrate the speed range and preset step size. The second preset speed is 10000 r / min, the third preset speed is 3000 r / min, and the preset speed range is 10000-3000 r / min. The first sub-preset speed range is 9000-8000 r / min, the second sub-preset speed range is 7000-6000 r / min, and the third sub-preset speed range is 5000-4000 r / min.

[0109] The preset step size is 1000, meaning the first value is 1000. The difference between the second and third preset speeds is 7000, meaning the second value is 7000. The ratio of the first value to the second value is 0.143.

[0110] By ensuring that the ratio of the first value to the second value falls within the aforementioned range, the sub-preset speed segments can be arranged more evenly within the preset speed range, thereby improving the accuracy of performance testing.

[0111] In one embodiment, reference Figure 4 As shown, S110: The step of obtaining standard data on the sliding motion of a preset hydrodynamic sliding bearing in a powerless state includes:

[0112] S1131: Obtain the first relationship curve between the rotational speed and time of the preset hydrodynamic sliding bearing. That is: obtain the curve of the rotational speed of the preset hydrodynamic sliding bearing changing with time.

[0113] S1132: Determine the standard rotational speed mutation value based on the first relationship curve.

[0114] Here, the standard speed change value refers to the inflection point value in the first relationship curve where the speed decreases rapidly.

[0115] It should be noted that, in this embodiment, the standard rotational speed mutation value is a numerical range. The numerical range of the standard rotational speed mutation value can be obtained in the following way:

[0116] In one example, multiple measurements are performed on the same preset hydrodynamic sliding bearing to obtain multiple first relationship curves. Multiple standard speed change values ​​are determined from these multiple first relationship curves. The maximum and minimum values ​​among these multiple standard speed change values ​​constitute the two endpoints of the numerical range.

[0117] In another example, multiple preset hydrodynamic sliding bearings of the same series are measured to obtain multiple first relationship curves. Multiple standard speed change values ​​are determined in these multiple first relationship curves. The maximum and minimum values ​​of these multiple standard speed change values ​​constitute the two endpoints of the numerical range.

[0118] In one embodiment, reference Figure 5 As shown, S120: The step of obtaining the measured data of the sliding motion of the hydrodynamic sliding bearing under test in a powerless state includes:

[0119] S1231: Obtain the second relationship curve between the rotational speed and time of the hydrodynamic sliding bearing under test. That is, obtain the curve showing the change in rotational speed of the hydrodynamic sliding bearing under test over time.

[0120] S1232: Determine the measured speed change value based on the second relationship curve.

[0121] Specifically, the measured speed change value refers to the inflection point where the speed decreases rapidly in the second relationship curve. Here, the measured speed change value is a specific numerical value. In the actual testing process, it is only necessary to obtain the second relationship curve of the hydrodynamic sliding bearing under test once, and then determine the measured speed change value in that second relationship curve.

[0122] S130: The steps for determining the performance parameters of the hydrodynamic sliding bearing to be tested based on standard data and measured data include:

[0123] S133: Determine the performance parameters of the hydrodynamic sliding bearing to be tested based on the standard speed change value and the measured speed change value. Specifically, if the measured speed change value is greater than the standard speed change value, determine that the performance parameters of the liquid metal bearing to be tested are less than a preset performance threshold.

[0124] Specifically, if the measured speed change exceeds the range of the standard speed change, the performance of the hydrodynamic sliding bearing under test is considered poor, and the components are severely aged. Furthermore, if the measured speed change exceeds the range of the standard speed change by a certain percentage, the performance of the hydrodynamic sliding bearing under test is considered extremely poor, and the components are extremely severely aged.

[0125] If the measured speed change value falls within the range of the standard speed change value, the performance of the hydrodynamic sliding bearing under test is considered to be good.

[0126] Secondly, referring to Figure 6 and Figure 7 As shown, this application embodiment provides an X-ray tube 10, which includes a hydrodynamic sliding bearing 11, a target disk 12, a drive assembly 13, and a detection element 14.

[0127] Specifically, the hydrodynamic sliding bearing 11 includes a spindle 111 and a bearing sleeve 112 fitted onto the spindle 111, with liquid metal 113 disposed between the spindle 111 and the bearing sleeve 112. A target disk 12 is disposed on the bearing sleeve 112. The drive assembly 13 includes a rotor 131 and a stator coil 132 fitted onto the rotor 131. The rotor 131 is fitted onto the spindle 111 and connected to the bearing sleeve 112. A detection element 14 is used to acquire the rotational speed of the bearing sleeve 112.

[0128] The X-ray tube 10 provided in this application includes a detection element 14 for acquiring the rotational speed of the bearing sleeve 112. This allows operators to easily detect the rotational speed of the bearing sleeve 112 even without power, enabling them to promptly understand the performance of the hydrodynamic sliding bearing 11 and preventing the X-ray tube 10 from being affected by a decline in the performance of the hydrodynamic sliding bearing 11. It is understood that the X-ray tube 10 provided in this embodiment can be tested using the performance testing method described in the first aspect.

[0129] In one embodiment, reference Figure 6 As shown, the detection element 14 is a speed sensor. For example, the speed sensor can be a photoelectric speed sensor, a variable reluctance speed sensor, a capacitive speed sensor, or a Hall effect speed sensor. In the specific detection process, the speed sensor can detect the actual speed of any one of the target disk 12, the bearing sleeve 112, and the rotor 131.

[0130] In a preferred embodiment, a speed sensor is used to detect the actual rotational speed of the target disk 12. Further, the target disk 12 is provided with detection marks, which can be pits or protrusions.

[0131] Understandably, the X-ray tube 10 also includes a housing, and the hydrodynamic sliding bearing 11, target disk 12, drive assembly 13 and detection element 14 are all disposed within the housing.

[0132] Furthermore, the speed sensor can be mounted on the housing. Since the housing is a vacuum environment, the speed sensor can be mounted outside the housing. Part of the housing is transparent, meaning the speed sensor detects the detection mark through the transparent housing.

[0133] In one embodiment, reference Figure 7 As shown, the detection element 14 is an electromagnetic detection element 14, used to detect the induced electromotive force on the stator coil 132. Furthermore, the electromagnetic detection element 14 is electrically connected to the stator coil 132.

[0134] Specifically, when the stator coil 132 is de-energized, the bearing sleeve 112 and the rotor 131 slide in a powerless state. The residual magnetism on the rotor 131 will generate an induced electromotive force on the stator. The electromagnetic detection element 14 detects the induced electromotive force on the stator and obtains the rotational speed of the rotor 131 by the frequency of the induced electromotive force.

[0135] In one embodiment, reference Figure 6 As shown, the X-ray tube 10 also includes a connecting ring 15, which is disposed between the bearing sleeve 112 and the rotor 131, and connects the bearing sleeve 112 and the rotor 131.

[0136] In the description of this specification, the references to terms such as "some embodiments," "other embodiments," "ideal embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0137] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features of the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0138] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for testing the performance of a hydrodynamic sliding bearing, characterized in that, include: Obtain standard data on the sliding motion of a preset hydrodynamic sliding bearing under no-power conditions; The standard data is one of the following: the standard interval time corresponding to the preset dynamic pressure sliding bearing in the preset speed range, the standard interval time corresponding to the preset dynamic pressure sliding bearing in multiple sub-preset speed ranges, and the standard speed change value. Obtain measured data of the sliding motion of the hydrodynamic sliding bearing under test in a powerless state; the measured data is one of the measured interval time corresponding to the hydrodynamic sliding bearing under test in the preset speed range, the measured interval time corresponding to the hydrodynamic sliding bearing under test in multiple sub-preset speed ranges respectively, and the measured speed change value. The performance parameters of the hydrodynamic sliding bearing to be tested are determined based on the standard data and the measured data; if the measured interval time is less than the standard interval time, the performance parameters of the liquid metal bearing to be tested are determined to be less than a preset performance threshold; or, if the measured interval time in any of the sub-preset speed segments is less than the standard interval time in that sub-preset speed segment, the performance parameters of the liquid metal bearing to be tested are determined to be less than a preset performance threshold; or, if the measured speed change value is greater than the standard speed change value, the performance parameters of the liquid metal bearing to be tested are determined to be less than a preset performance threshold.

2. The performance testing method for a hydrodynamic sliding bearing according to claim 1, characterized in that, The step of obtaining standard data on the sliding motion of a preset hydrodynamic sliding bearing in a powerless state includes: Obtain the standard interval time corresponding to the preset dynamic pressure sliding bearing in the preset speed range.

3. The performance testing method for a hydrodynamic sliding bearing according to claim 2, characterized in that, The step of obtaining measured data of the sliding motion of the hydrodynamic sliding bearing under test in a powerless state includes: Obtain the measured interval time corresponding to the preset speed range of the hydrodynamic sliding bearing under test; The step of determining the performance parameters of the hydrodynamic sliding bearing to be tested based on the standard data and the measured data includes: The performance parameters of the hydrodynamic sliding bearing to be tested are determined based on the standard interval time and the measured interval time; if the measured interval time is less than the standard interval time, the performance parameters of the liquid metal bearing to be tested are determined to be less than a preset performance threshold.

4. The performance testing method for a hydrodynamic sliding bearing according to claim 1, characterized in that, The step of obtaining standard data on the sliding motion of a preset hydrodynamic sliding bearing in a powerless state includes: Obtain the standard interval time corresponding to the preset hydrodynamic sliding bearing in multiple sub-preset speed ranges; wherein, the speed range of each sub-preset speed range is different.

5. The performance testing method for a hydrodynamic sliding bearing according to claim 4, characterized in that, The step of obtaining measured data of the sliding motion of the hydrodynamic sliding bearing under test in a powerless state includes: Obtain the measured interval time corresponding to the hydrodynamic sliding bearing under test in each of the multiple sub-preset speed ranges; The step of determining the performance parameters of the hydrodynamic sliding bearing to be tested based on the standard data and the measured data includes: The performance parameters of the hydrodynamic sliding bearing to be tested are determined based on the standard interval time and the measured interval time of each of the sub-preset speed segments; wherein, if the measured interval time of any sub-preset speed segment is less than the standard interval time of that sub-preset speed segment, the performance parameters of the liquid metal bearing to be tested are determined to be less than a preset performance threshold.

6. The performance testing method for a hydrodynamic sliding bearing according to claim 4, characterized in that, In the plurality of sub-preset speed segments, the speed difference of each sub-preset speed segment is equal, and the speed range of each sub-preset speed segment decreases sequentially according to a preset step size.

7. The performance testing method for a hydrodynamic sliding bearing according to claim 1, characterized in that, The step of obtaining standard data on the sliding motion of a preset hydrodynamic sliding bearing in a powerless state includes: Obtain the first relationship curve between the rotational speed and time of the preset hydrodynamic sliding bearing; Based on the first relationship curve, determine the standard rotational speed mutation value.

8. The performance testing method for a hydrodynamic sliding bearing according to claim 7, characterized in that, The step of obtaining measured data of the sliding motion of the hydrodynamic sliding bearing under test in a powerless state includes: Obtain the second relationship curve between the rotational speed and time of the hydrodynamic sliding bearing to be tested; Based on the second relationship curve, determine the measured speed change value; The step of determining the performance parameters of the hydrodynamic sliding bearing to be tested based on the standard data and the measured data includes: The performance parameters of the hydrodynamic sliding bearing to be tested are determined based on the standard speed change value and the measured speed change value; wherein, if the measured speed change value is greater than the standard speed change value, the performance parameters of the liquid metal bearing to be tested are determined to be less than a preset performance threshold.

9. An X-ray tube, characterized in that, include: A hydrodynamic sliding bearing (11) includes a spindle (111) and a bearing sleeve (112) sleeved on the spindle (111), wherein liquid metal (113) is disposed between the spindle (111) and the bearing sleeve (112); The target plate (12) is disposed on the bearing sleeve (112); The drive assembly (13) includes a rotor (131) and a stator coil (132) sleeved on the rotor (131); the rotor (131) is sleeved on the spindle (111) and connected to the bearing sleeve (112); The detection element (14) is used to obtain the rotational speed of the bearing sleeve (112); the drive assembly (13) and the detection element (14) can cooperate with each other to detect the performance of the hydrodynamic sliding bearing (11) using the performance testing method of the hydrodynamic sliding bearing as described in any one of claims 1-8.

10. The X-ray tube according to claim 9, characterized in that, The detection component (14) is a speed sensor; Alternatively, the detection element (14) may be an electromagnetic detection element used to detect the induced electromotive force on the stator coil (132).

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