Performance detection method of dynamic pressure sliding bearing and X-ray tube

Abstract

The invention 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: acquiring standard data of preset sliding of the dynamic pressure sliding bearing in an unpowered state; acquiring actual measurement data of the to-be-detected dynamic pressure sliding bearing sliding in an unpowered state; and determining performance parameters of the to-be-detected dynamic pressure sliding bearing according to the standard data and the measured data. Therefore, an operator can conveniently monitor the performance of the dynamic pressure sliding bearing, so that the use performance of the dynamic pressure sliding bearing can be known in time, and the normal use of the X-ray tube is prevented from being influenced by the performance reduction of the dynamic pressure sliding bearing.

Description

Technical Field

[0001] The present application relates to the technical field of medical device monitoring, and in particular to a performance detection method for a hydrodynamic sliding bearing and an X-ray tube. Background Art

[0002] X-ray tubes play an important role in various fields such as medical diagnosis, safety 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 the 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. The high-speed electrons interact with the atoms of the target 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. Part of the heat on the anode target is radiated to the outside of the X-ray tube by thermal radiation, and the other part of the heat is conducted to the outside of the X-ray tube through the rotor and the hydrodynamic sliding bearing.

[0003] However, after long-term operation of the hydrodynamic sliding bearing, the wear of the bearing and the oxidation of the liquid metal can easily lead to changes in the bearing performance. Therefore, how to monitor the performance of the bearing has become an urgent problem to be solved. Summary of the invention

[0004] Based on this, it is necessary to provide a performance detection method and an X-ray tube for a hydrodynamic sliding bearing to address the above problems.

[0005] In a first aspect, the present application provides a method for detecting the performance of a hydrodynamic sliding bearing, the method comprising:

[0006] Obtaining standard data of a preset hydrodynamic sliding bearing sliding in a powerless state;

[0007] Acquire measured data of the dynamic pressure sliding bearing to be tested sliding in a powerless state;

[0008] The performance parameters of the dynamic pressure sliding bearing to be tested are determined according to the standard data and the measured data.

[0009] In one embodiment, the step of obtaining standard data of the preset dynamic pressure sliding bearing sliding in a powerless state includes:

[0010] The standard interval time corresponding to the preset dynamic pressure sliding bearing in the preset speed range is obtained.

[0011] In one embodiment, the step of obtaining measured data of the dynamic pressure sliding bearing to be tested sliding in a powerless state includes:

[0012] Obtaining the actual measured interval time corresponding to the dynamic pressure sliding bearing to be tested in the preset speed range;

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

[0014] The performance parameter of the dynamic pressure sliding bearing to be tested is determined according to the standard interval time and the measured interval time; when 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 tested is less than a preset performance threshold.

[0015] In one embodiment, the step of obtaining standard data of the preset dynamic pressure sliding bearing sliding in a powerless state includes:

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

[0017] In one embodiment, the step of obtaining measured data of the dynamic pressure sliding bearing to be tested sliding in a powerless state includes:

[0018] Obtaining the actual measured interval time corresponding to each of the plurality of sub-preset speed sections of the dynamic pressure sliding bearing to be tested;

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

[0020] The performance parameters of the dynamic pressure sliding bearing to be tested are determined based on the standard interval time and the measured interval time of each sub-preset speed segment; wherein, when the measured interval time of any sub-preset speed segment is less than the standard interval time of the sub-preset speed segment, it is determined that the performance parameters of the liquid metal bearing to be tested are less than a preset performance threshold.

[0021] In one of the embodiments, among 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 in sequence according to a preset step size.

[0022] In one embodiment, the step of obtaining standard data of the preset dynamic pressure sliding bearing sliding in a powerless state includes:

[0023] Obtaining a first relationship curve between the rotation speed and time of the preset dynamic pressure sliding bearing;

[0024] According to the first relationship curve, a standard rotation speed mutation value is determined.

[0025] In one embodiment, the step of obtaining measured data of the dynamic pressure sliding bearing to be tested sliding in a powerless state includes:

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

[0027] Determining a sudden change value of the actually measured rotation speed according to the second relationship curve;

[0028] The step of determining the performance parameters of the dynamic pressure sliding bearing to be tested according to the standard data and the measured data comprises:

[0029] The performance parameters of the dynamic pressure sliding bearing to be tested are determined according to the standard speed mutation value and the measured speed mutation value; wherein, when the measured speed mutation value is greater than the standard speed mutation value, it is determined that the performance parameters of the liquid metal bearing to be tested are less than a preset performance threshold.

[0030] The performance detection method of the dynamic pressure sliding bearing provided in the present application determines the performance parameters of the dynamic pressure sliding bearing to be detected based on the preset standard data of the dynamic pressure sliding bearing in the unpowered state and the measured data of the dynamic pressure sliding bearing to be detected in the unpowered state. In this way, it is convenient for the operator to monitor the performance of the dynamic pressure sliding bearing, so as to timely understand the performance of the dynamic pressure sliding bearing and avoid affecting the normal use of the X-ray tube due to the degradation of the performance of the dynamic pressure sliding bearing.

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

[0032] A dynamic pressure sliding bearing comprises a core shaft and a bearing sleeve sleeved on the core shaft, wherein liquid metal is arranged between the core shaft and the bearing sleeve;

[0033] A target plate is arranged on the bearing sleeve;

[0034] A driving assembly, comprising a rotor and a stator coil sleeved on the rotor; the rotor is sleeved on the core shaft and connected to the bearing sleeve;

[0035] The detection part is used to obtain the rotation speed of the bearing sleeve.

[0036] In one of the embodiments, the detection element is a rotation speed sensor;

[0037] Alternatively, the detection element is an electromagnetic detection element, which is used to detect the induced electromotive force on the stator coil.

[0038] The X-ray tube provided in the present application is provided with a detection member for obtaining the rotation speed of the bearing sleeve, so that it is convenient for the operator to detect the rotation speed of the bearing sleeve in a non-powered state, thereby facilitating the operator to timely understand the use performance of the hydrodynamic sliding bearing, and avoiding the normal use of the X-ray tube being affected by the degradation of the performance of the hydrodynamic sliding bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 A schematic flow chart of a method for detecting the performance of a hydrodynamic sliding bearing provided in one embodiment of the present application.

[0041] Figure 2 Another schematic flow chart of a method for detecting the performance of a hydrodynamic sliding bearing provided in an embodiment of the present application.

[0042] Figure 3 A schematic diagram of another flow chart of a method for detecting the performance of a hydrodynamic sliding bearing provided in an embodiment of the present application.

[0043] Figure 4 for Figure 1 A schematic diagram of a flow chart of S110 in the method shown.

[0044] Figure 5 for Figure 1 A schematic diagram of a flow chart of S120 in the method shown.

[0045] Figure 6 A schematic diagram of the structure of an X-ray tube provided in one embodiment of the present application.

[0046] Figure 7 A schematic diagram of the structure of another X-ray tube provided in an embodiment of the present application.

[0047] Description of reference numerals:

[0048] 10. X-ray tube; 11. hydrodynamic sliding bearing; 111. mandrel; 112. bearing sleeve; 113. liquid metal; 12. target plate; 13. drive assembly; 131. rotor; 132. stator coil; 14. detection part; 15. connecting ring. DETAILED DESCRIPTION

[0049] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0050] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0053] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0054] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0055] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, in this specification, the term "and / or" includes any and all combinations of the relevant listed items.

[0056] First, refer to Figure 1 As shown, an embodiment of the present application provides a performance detection method for a hydrodynamic sliding bearing, and the performance detection method for a hydrodynamic sliding bearing includes:

[0057] S110: Acquire standard data of a preset dynamic pressure sliding bearing sliding in a powerless state.

[0058] Here, it should be noted that the preset dynamic pressure sliding bearing refers to: a dynamic pressure sliding bearing with normal performance. In one example, the preset dynamic pressure sliding bearing can be a dynamic pressure sliding bearing just shipped from the factory. Standard data refers to: detection data of the preset dynamic pressure sliding bearing in a non-powered state.

[0059] It is understandable that, referring to Figure 6 As shown, the hydrodynamic sliding bearing 11 generally includes a core shaft 111 and a bearing sleeve 112 sleeved on the core shaft 111, and liquid metal 113 is arranged between the core shaft 111 and the bearing sleeve 112. The target plate 12 is usually arranged on the bearing sleeve 112, and the bearing sleeve 112 rotates under the drive of the driving component 13. Specifically, the driving component 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 through 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 plate 12 to rotate. In the embodiment of the present application, the unpowered state means: during the rotation of the rotor 131 and the bearing sleeve 112, the stator coil 132 is powered off 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 inertia. It can be understood that due to the existence of friction, the rotation speed of the rotor 131 and the bearing sleeve 112 becomes smaller and smaller until the rotation speed becomes zero.

[0061] S120: Acquire actual measured data of the dynamic pressure sliding bearing to be tested sliding in a powerless state.

[0062] Here, it should be noted that the dynamic pressure sliding bearing to be tested refers to: a dynamic pressure sliding bearing that needs to be tested for performance after a period of use. The measured data refers to: the test data of the dynamic pressure sliding bearing to be tested in a non-powered state.

[0063] It should be noted that when detecting the parameters of the dynamic pressure sliding bearing (the preset dynamic pressure sliding bearing and the dynamic pressure sliding bearing to be detected), the dynamic pressure sliding bearing can first be made to reach a first preset speed, and then the stator winding can be powered off to put the dynamic pressure sliding bearing in an unpowered state.

[0064] In one embodiment, the first preset speed may be in the range of 5000-15000 r / min. Specifically, the first preset speed may 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 the hydrodynamic sliding bearing, the speed of the hydrodynamic sliding bearing can be firstly made to reach 15000r / min, and then the stator coil can be powered off to put the hydrodynamic sliding bearing in an unpowered state, that is, the bearing sleeve rotates under the action of inertia. In this way, the speed of the hydrodynamic sliding bearing in the unpowered state gradually decreases from 15000r / min until the speed is zero. By making the hydrodynamic sliding bearing reach the first preset speed, the hydrodynamic sliding bearing can slide for a long enough time in the unpowered state, which is convenient for testing the parameters of the hydrodynamic sliding bearing.

[0066] S130: Determine the performance parameters of the dynamic pressure sliding bearing to be tested according to the standard data and the measured data.

[0067] Here, it should be noted that the performance parameter may be the damping performance of the hydrodynamic sliding bearing. When the components of the hydrodynamic sliding bearing are in a normal state, the damping performance is within a preset range. When the components of the hydrodynamic sliding bearing encounter an adverse condition, the damping performance deviates from the preset range. For example, when wear and abrasion occur between the bearing sleeve and the core shaft, or when the liquid metal oxidizes, the damping performance of the hydrodynamic sliding bearing will be affected, causing the damping performance to deviate from the preset range. Therefore, the embodiment of the present application can obtain the performance of the hydrodynamic sliding bearing by determining the damping performance of the hydrodynamic sliding bearing.

[0068] In one example, the performance parameters of the dynamic pressure sliding bearing to be tested can be determined by comparing the numerical values ​​of the standard data and the measured data. For example, if the numerical value of the measured data is greater than the numerical value of the standard data, it is determined that the performance of the dynamic pressure sliding bearing to be tested is relatively poor, and the dynamic pressure sliding bearing needs to be replaced. If the numerical value of the measured data is less than or equal to the numerical value of the standard data, it is determined that the performance of the dynamic pressure sliding bearing to be tested is good, and the dynamic pressure sliding bearing can continue to be used.

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

[0070] The performance detection method of the dynamic pressure sliding bearing provided in the present application determines the performance parameters of the dynamic pressure sliding bearing to be detected based on the preset standard data of the dynamic pressure sliding bearing in the unpowered state and the measured data of the dynamic pressure sliding bearing to be detected in the unpowered state. In this way, it is convenient for the operator to monitor the performance of the dynamic pressure sliding bearing, so as to timely understand the performance of the dynamic pressure sliding bearing. When the performance of the dynamic pressure sliding bearing is poor, the operator can take intervention actions in time, such as replacing the dynamic pressure sliding bearing, to avoid further deterioration of the performance of the dynamic pressure sliding bearing, thereby affecting the normal use of the X-ray tube.

[0071] In one embodiment, referring to Figure 2 As shown, S110: the step of obtaining standard data of the preset dynamic pressure sliding bearing sliding in a powerless state includes:

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

[0073] Here, it should be noted that the preset speed section refers to: the sliding section from a certain high speed to a certain low speed when the hydrodynamic sliding bearing is sliding. For example, the preset speed section may be: the sliding section from 1000r / min to 500r / min of the hydrodynamic sliding bearing. The time spent in the sliding section is the standard interval time corresponding to the preset speed section.

[0074] In one embodiment, the standard interval time is a specific value. Specifically, in one example, when obtaining the standard interval time, the same preset dynamic pressure sliding bearing can be measured multiple times to obtain multiple interval time values, and the average of all the interval time values ​​is calculated, and the average value is the standard interval time. In another example, when obtaining the standard interval time, multiple preset dynamic pressure sliding bearings of the same series can be measured separately to obtain multiple interval time values, and the average of all the interval time values ​​is calculated, and the 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, the same preset dynamic pressure sliding bearing can be measured multiple times to obtain multiple interval time values, wherein the maximum interval time and the minimum interval time constitute the endpoint value of the numerical range of the standard interval time. In another example, when obtaining the standard interval time, multiple preset dynamic pressure sliding bearings of the same series can be measured respectively to obtain multiple interval time values, wherein the maximum interval time and the minimum interval time constitute the endpoint value of the numerical range of the standard interval time. It can be understood that setting the standard interval time as a numerical range can improve the accuracy of performance detection.

[0076] In one embodiment, referring to Figure 2 As shown, S120: the step of obtaining measured data of the dynamic pressure sliding bearing to be tested sliding in a powerless state includes:

[0077] S121: Obtaining the actual measured interval time corresponding to the dynamic pressure sliding bearing to be tested in the preset speed range.

[0078] It should be noted that, in one example, when obtaining the measured interval time, the dynamic pressure sliding bearing to be tested is tested only once to obtain the measured interval time. In another example, when obtaining the measured interval time, multiple tests are performed, and the values ​​of the multiple measurement results are averaged, and the average value is the measured interval time.

[0079] S130: The step of determining the performance parameters of the dynamic pressure sliding bearing to be tested according to the standard data and the measured data includes:

[0080] S131: Determine the performance parameter of the dynamic pressure sliding bearing to be tested according to the standard interval time and the measured interval time. When the measured interval time is less than the standard interval time, determine that the performance parameter of the liquid metal bearing to be tested is less than a 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 work normally.

[0082] Specifically, when the standard interval time is a specific value, the numerical values ​​of the measured interval time and the standard interval time are compared. If the measured interval time is less than the standard interval time, it is determined that the performance of the dynamic pressure sliding bearing to be tested is relatively poor and the aging of the parts is relatively serious. If the measured interval time is greater than or equal to the standard interval time, it is determined that the performance of the dynamic pressure sliding bearing to be tested is good.

[0083] When the standard interval time is a numerical range, the performance parameters of the dynamic pressure sliding bearing to be tested are determined by judging whether the measured interval time falls within the numerical range of the standard interval time. If the measured interval time falls within the numerical range of the standard interval time, it is determined that the performance of the dynamic pressure sliding bearing to be tested is good. If the measured interval time is less than the numerical range of the standard interval time, it is determined that the performance of the dynamic pressure sliding bearing to be tested is relatively poor and the aging of the parts is relatively serious.

[0084] In one embodiment, referring to Figure 3 As shown, S110: the step of obtaining standard data of the preset dynamic pressure sliding bearing sliding in a powerless state includes:

[0085] S112: Obtaining the standard interval time corresponding to each of the plurality of sub-preset speed sections of the preset dynamic pressure sliding bearing, wherein the speed range of each sub-preset speed section is different.

[0086] In this way, it is equivalent to obtaining the standard interval time corresponding to the preset dynamic pressure sliding bearing in different sub-preset speed sections, that is, making the data sample range of the standard data wider and more data, thereby improving the accuracy of performance detection.

[0087] Here, it should be noted that the sub-preset speed section refers to: the sliding section from a certain high speed to a certain low speed when the hydrodynamic sliding bearing is sliding. Exemplarily, the sub-preset speed section may be: the sliding section from 1000r / min to 500r / min of the hydrodynamic sliding bearing. The time spent in the sliding section is the standard interval time corresponding to the sub-preset speed section.

[0088] In one embodiment, the standard interval time is a specific value, and the standard interval time can be obtained by:

[0089] In one example, when obtaining the standard interval time corresponding to the same sub-preset speed segment, the same preset dynamic pressure sliding bearing can be measured multiple times to obtain multiple interval time values, and the average value of all the interval time values ​​is calculated, and the average value is the standard interval time. In another example, when obtaining the standard interval time corresponding to the same sub-preset speed segment, multiple preset dynamic pressure sliding bearings of the same series can be measured separately to obtain multiple interval time values, and the average value of all the interval time values ​​is calculated, and the average value is the standard interval time.

[0090] In another embodiment, the standard interval time is a value range, and the standard interval time can be obtained by:

[0091] In one example, when obtaining the standard interval time corresponding to the same sub-preset speed segment, the same preset dynamic pressure sliding bearing can be measured multiple times to obtain multiple interval time values, wherein the maximum interval time and the minimum interval time constitute the endpoint value of the numerical range of the standard interval time. In another example, when obtaining the standard interval time corresponding to the same sub-preset speed segment, multiple preset dynamic pressure sliding bearings of the same series can be measured respectively to obtain multiple interval time values, wherein the maximum interval time and the minimum interval time constitute the endpoint value of the numerical range of the standard interval time. It can be understood that setting the standard interval time as a numerical range can improve the accuracy of performance detection.

[0092] In one embodiment, S120: the step of obtaining measured data of the dynamic pressure sliding bearing to be tested sliding in a powerless state comprises:

[0093] S122: Obtaining the actual measured interval times corresponding to the dynamic pressure sliding bearing to be tested in multiple sub-preset speed ranges.

[0094] It should be noted that, in one example, when obtaining the actual measured interval time corresponding to a sub-preset speed segment, the dynamic pressure sliding bearing to be tested is only tested once to obtain the actual measured interval time. In another example, when obtaining the actual measured interval time corresponding to a sub-preset speed segment, multiple tests are performed, and the values ​​of the multiple measurement results are averaged, and the average value is the actual measured interval time corresponding to the sub-preset speed segment.

[0095] S130: The step of determining the performance parameters of the dynamic pressure sliding bearing to be tested according to the standard data and the measured data includes:

[0096] S132: Determine the performance parameter of the dynamic pressure sliding bearing to be tested according to the standard interval time and the measured interval time of each sub-preset speed segment. Wherein, when the measured interval time of any sub-preset speed segment 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 tested is less than the preset performance threshold.

[0097] Specifically, the standard interval time and the measured interval time of each sub-preset speed segment are compared respectively. Among all the sub-preset speed segments, as long as the measured interval time of one sub-preset speed segment is smaller than the standard interval time, it is determined that the performance parameter of the liquid metal bearing to be tested is smaller than the preset performance threshold; otherwise, it is determined that the performance of the liquid metal bearing to be tested meets 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, it is determined that the performance of the dynamic pressure sliding bearing to be tested is relatively poor and the aging of the parts is relatively serious. If the measured interval time is greater than or equal to the standard interval time, it is determined that the dynamic pressure sliding bearing to be tested meets the performance requirements in the sub-preset speed range.

[0100] When the standard interval time is a numerical range, the performance parameters of the dynamic pressure sliding bearing to be tested are determined by judging whether the measured interval time falls within the numerical range of the standard interval time. If the measured interval time falls within the numerical range of the standard interval time, it is determined that the dynamic pressure sliding bearing to be tested meets the performance requirements under the sub-preset speed range. If the measured interval time is less than the numerical range of the standard interval time, it is determined that the performance of the dynamic pressure sliding bearing to be tested is relatively poor and the aging of the parts is relatively serious.

[0101] In one of the embodiments, among the above-mentioned multiple sub-preset speed sections, the speed difference of each sub-preset speed section is equal, and the speed range of each sub-preset speed section decreases in sequence according to a preset step size.

[0102] Specifically, the embodiment of the present application takes a specific numerical value as an example to illustrate the speed range and the preset step length. It is assumed that three sub-preset speed segments need to be measured, namely the first sub-preset speed segment, the second sub-preset speed segment and the third sub-preset speed segment. The speed range of the first sub-preset speed segment is 5000-4500r / min, the speed range of the second sub-preset speed segment is 4000-3500r / min, and the speed range of the third sub-preset speed segment is 3000-2500r / min. Among them, the speed ranges of the first sub-preset speed segment, the second sub-preset speed segment and the third sub-preset speed segment are all 500r / min, the step length between the first sub-preset speed segment and the second sub-preset speed segment is 500r / min, and the step length between the second sub-preset speed segment and the third sub-preset speed segment is 500r / min.

[0103] The embodiment of the present application makes the speed range of each sub-preset speed segment decrease in sequence according to a preset step size, so that the distribution of all sub-preset speed segments can be more uniform, thereby improving the accuracy of performance detection.

[0104] In one embodiment, all sub-preset speed segments can be within a preset speed range. The highest speed of the preset speed range is the second preset speed, and the lowest speed of the preset speed range is the third preset speed. In one example, the speed range of the second preset speed is between 9600-10800 r / min, that is, the specific value of the second preset speed can be selected according to actual conditions within the above range. The third preset speed is between 2400-3600 r / min, that is, the specific value of the third preset speed can be selected according to actual conditions within the above range.

[0105] In a specific example, 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.

[0106] It should be noted that by making all sub-preset speed segments within the preset speed range, and making the highest speed and the lowest speed of the preset speed range within the above range, on the one hand, the distribution area of ​​the sub-preset speed segments can be made more reasonable and closer to the actual working conditions, thereby improving the accuracy of performance testing.

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

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

[0109] Among them, the value of the preset step size is 1000, that is: the first value is 1000, the difference between the second preset speed and the third preset speed is 7000, that is: the second value is 7000, and the ratio of the first value to the second value is 0.143.

[0110] By making the ratio of the first value to the second value within the above range, each sub-preset speed segment can be arranged more evenly within the preset speed range, thereby improving the accuracy of performance detection.

[0111] In one embodiment, referring to Figure 4 As shown, S110: the step of obtaining standard data of the preset dynamic pressure sliding bearing sliding in a powerless state includes:

[0112] S1131: Obtain a first relationship curve between the rotation speed of the preset dynamic pressure sliding bearing and time, that is, obtain a curve of the rotation speed of the preset dynamic pressure sliding bearing changing with time.

[0113] S1132: Determine a standard rotation speed mutation value according to the first relationship curve.

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

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

[0116] In one example, multiple measurements are performed on the same preset dynamic pressure sliding bearing to obtain multiple first relationship curves, and multiple standard speed mutation values ​​are determined in the multiple first relationship curves. The maximum value and the minimum value of the multiple standard speed mutation values ​​constitute the two endpoint values ​​of the numerical range.

[0117] In another example, multiple preset dynamic pressure sliding bearings of the same series are measured separately to obtain multiple first relationship curves, and multiple standard speed mutation values ​​are determined in the multiple first relationship curves. The maximum value and the minimum value of the multiple standard speed mutation values ​​constitute the two endpoint values ​​of the numerical range.

[0118] In one embodiment, referring to Figure 5 As shown, S120: the step of obtaining measured data of the dynamic pressure sliding bearing to be tested sliding in a powerless state includes:

[0119] S1231: Obtain a second relationship curve between the rotation speed of the dynamic pressure sliding bearing to be tested and time, that is, obtain a curve of the rotation speed of the dynamic pressure sliding bearing to be tested changing with time.

[0120] S1232: Determine the actual measured rotation speed mutation value according to the second relationship curve.

[0121] Specifically, the measured speed mutation value refers to: the inflection point value where the speed decreases rapidly in the second relationship curve. Here, the measured speed mutation value is a specific value. In the actual detection process, it is only necessary to obtain the second relationship curve of the dynamic pressure sliding bearing to be detected once, and then determine the measured speed mutation value in the second relationship curve.

[0122] S130: The step of determining the performance parameters of the dynamic pressure sliding bearing to be tested according to the standard data and the measured data includes:

[0123] S133: Determine the performance parameter of the dynamic pressure sliding bearing to be tested according to the standard speed mutation value and the measured speed mutation value. Wherein, when the measured speed mutation value is greater than the standard speed mutation value, it is determined that the performance parameter of the liquid metal bearing to be tested is less than a preset performance threshold.

[0124] Specifically, if the measured speed mutation value is greater than the range of the standard speed mutation value, it is determined that the performance of the dynamic pressure sliding bearing to be tested is relatively poor and the aging of the parts is relatively serious. Further, if the measured speed mutation value exceeds the range of the standard speed mutation value by a certain proportion, it is determined that the performance of the dynamic pressure sliding bearing to be tested is particularly poor and the aging of the parts is particularly serious.

[0125] If the measured speed mutation value falls within the range of the standard speed mutation value, it is determined that the performance of the dynamic pressure sliding bearing to be tested is good.

[0126] Second, refer to Figure 6 and Figure 7 As shown, an embodiment of the present application provides an X-ray tube 10 , which includes a hydrodynamic sliding bearing 11 , a target plate 12 , a driving assembly 13 and a detection member 14 .

[0127] Specifically, the hydrodynamic sliding bearing 11 includes a core shaft 111 and a bearing sleeve 112 sleeved on the core shaft 111, and a liquid metal 113 is arranged between the core shaft 111 and the bearing sleeve 112. The target plate 12 is arranged on the bearing sleeve 112. The driving component 13 includes a rotor 131 and a stator coil 132 sleeved on the rotor 131. The rotor 131 is sleeved on the core shaft 111 and connected to the bearing sleeve 112. The detection member 14 is used to obtain the rotation speed of the bearing sleeve 112.

[0128] The X-ray tube 10 provided in the present application is provided with a detection member 14 for obtaining the rotation speed of the bearing sleeve 112, so that it is convenient for the operator to detect the rotation speed of the bearing sleeve 112 in a non-powered state, thereby facilitating the operator to timely understand the performance of the dynamic pressure sliding bearing 11, and avoiding the normal use of the X-ray tube 10 being affected by the degradation of the performance of the dynamic pressure sliding bearing 11. It can be understood that the X-ray tube 10 provided in the embodiment of the present application can be detected by the performance detection method in the first aspect.

[0129] In one embodiment, referring to Figure 6 As shown, the detection member 14 is a speed sensor. Exemplarily, the speed sensor can be a photoelectric speed sensor, a variable magnetic resistance speed sensor, a capacitive speed sensor, or a Hall speed sensor. In a specific detection process, the speed sensor can detect the actual speed of any one of the target plate 12, the bearing sleeve 112, and the rotor 131.

[0130] In a preferred embodiment, the rotation speed sensor is used to detect the actual rotation speed of the target disk 12. Further, a detection mark is provided on the target disk 12, wherein the detection mark can be a pit or a protrusion.

[0131] It can be understood that the X-ray tube 10 further includes a housing, and the hydrodynamic sliding bearing 11, the target plate 12, the driving assembly 13 and the detection element 14 are all arranged in the housing.

[0132] Furthermore, the speed sensor can be arranged on the housing. Since the housing is in a vacuum environment, the speed sensor can be arranged outside the housing. A part of the housing is a transparent housing, that is, the speed sensor detects the detection mark through the transparent housing.

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

[0134] Specifically, when the stator coil 132 is powered off, the bearing sleeve 112 and the rotor 131 slide in an unpowered state, and the residual magnetism on the rotor 131 generates an induced electromotive force on the stator. The electromagnetic detection component 14 detects the induced electromotive force on the stator and obtains the rotation speed of the rotor 131 through the frequency of the induced electromotive force.

[0135] In one embodiment, referring to Figure 6 As shown, the X-ray tube 10 further 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 description with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0137] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features of the above-described 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 above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A method for detecting the performance of a hydrodynamic sliding bearing, characterized in that: include: Obtaining standard data of a preset hydrodynamic sliding bearing sliding in a powerless state; Acquire measured data of the dynamic pressure sliding bearing to be tested sliding in a powerless state; The performance parameters of the dynamic pressure sliding bearing to be tested are determined according to the standard data and the measured data.

2. The performance detection method of a hydrodynamic sliding bearing according to claim 1, characterized in that: The step of obtaining the preset standard data of the dynamic pressure sliding bearing sliding in a powerless state comprises: The standard interval time corresponding to the preset dynamic pressure sliding bearing in the preset speed range is obtained.

3. The performance detection method of a dynamic pressure sliding bearing according to claim 2, characterized in that: The step of obtaining measured data of the dynamic pressure sliding bearing to be tested sliding in a powerless state comprises: Obtaining the actual measured interval time corresponding to the dynamic pressure sliding bearing to be tested in the preset speed range; The step of determining the performance parameters of the dynamic pressure sliding bearing to be tested according to the standard data and the measured data comprises: The performance parameter of the dynamic pressure sliding bearing to be tested is determined according to the standard interval time and the measured interval time; when 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 tested is less than a preset performance threshold.

4. The performance detection method of a hydrodynamic sliding bearing according to claim 1, characterized in that: The step of obtaining the preset standard data of the dynamic pressure sliding bearing sliding in a powerless state comprises: The standard interval time corresponding to each of the preset dynamic pressure sliding bearing in a plurality of sub-preset speed sections is obtained; wherein the speed range of each sub-preset speed section is different.

5. The performance detection method of a hydrodynamic sliding bearing according to claim 4, characterized in that: The step of obtaining measured data of the dynamic pressure sliding bearing to be tested sliding in a powerless state comprises: Obtaining the actual measured interval time corresponding to each of the plurality of sub-preset speed sections of the dynamic pressure sliding bearing to be tested; The step of determining the performance parameters of the dynamic pressure sliding bearing to be tested according to the standard data and the measured data comprises: The performance parameters of the dynamic pressure sliding bearing to be tested are determined based on the standard interval time and the measured interval time of each sub-preset speed segment; wherein, when the measured interval time of any sub-preset speed segment is less than the standard interval time of the sub-preset speed segment, it is determined that the performance parameters of the liquid metal bearing to be tested are less than a preset performance threshold.

6. The performance testing method of a hydrodynamic sliding bearing according to claim 4, characterized in that: In the plurality of sub-preset speed sections, the speed differences of the sub-preset speed sections are all equal, and the speed ranges of the sub-preset speed sections decrease in sequence according to the preset step lengths.

7. The performance detection method of a hydrodynamic sliding bearing according to claim 1, characterized in that: The step of obtaining the preset standard data of the dynamic pressure sliding bearing sliding in a powerless state comprises: Obtaining a first relationship curve between the rotation speed and time of the preset dynamic pressure sliding bearing; According to the first relationship curve, a standard rotation speed mutation value is determined.

8. The method for testing the performance of a hydrodynamic sliding bearing according to claim 7, characterized in that: The step of obtaining measured data of the dynamic pressure sliding bearing to be tested sliding in a powerless state comprises: Acquire a second relationship curve between the rotation speed and time of the dynamic pressure sliding bearing to be tested; Determining a sudden change value of the actually measured rotation speed according to the second relationship curve; The step of determining the performance parameters of the dynamic pressure sliding bearing to be tested according to the standard data and the measured data comprises: The performance parameters of the dynamic pressure sliding bearing to be tested are determined according to the standard speed mutation value and the measured speed mutation value; wherein, when the measured speed mutation value is greater than the standard speed mutation value, it is determined that the performance parameters of the liquid metal bearing to be tested are less than a preset performance threshold.

9. An X-ray tube, characterized in that: include: A dynamic pressure sliding bearing (11) comprises a core shaft (111) and a bearing sleeve (112) sleeved on the core shaft (111), wherein liquid metal (113) is arranged between the core shaft (111) and the bearing sleeve (112); A target plate (12) is arranged on the bearing sleeve (112); A driving assembly (13) comprises a rotor (131) and a stator coil (132) sleeved on the rotor (131); the rotor (131) is sleeved on the core shaft (111) and connected to the bearing sleeve (112); The detection element (14) is used to obtain the rotation speed of the bearing sleeve (112).

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

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