CN113161217A - Large-bearing radial liquid metal bearing - Google Patents
Large-bearing radial liquid metal bearing Download PDFInfo
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- CN113161217A CN113161217A CN202110409849.4A CN202110409849A CN113161217A CN 113161217 A CN113161217 A CN 113161217A CN 202110409849 A CN202110409849 A CN 202110409849A CN 113161217 A CN113161217 A CN 113161217A
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- 229910001338 liquidmetal Inorganic materials 0.000 title claims abstract description 39
- 230000001154 acute effect Effects 0.000 claims description 10
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000005461 lubrication Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 239000000314 lubricant Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
- H01J35/08—Anodes; Anti cathodes
- H01J35/10—Rotary anodes; Arrangements for rotating anodes; Cooling rotary anodes
- H01J35/101—Arrangements for rotating anodes, e.g. supporting means, means for greasing, means for sealing the axle or means for shielding or protecting the driving
- H01J35/1017—Bearings for rotating anodes
- H01J35/104—Fluid bearings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
- H01J35/08—Anodes; Anti cathodes
- H01J35/10—Rotary anodes; Arrangements for rotating anodes; Cooling rotary anodes
- H01J35/101—Arrangements for rotating anodes, e.g. supporting means, means for greasing, means for sealing the axle or means for shielding or protecting the driving
- H01J35/1017—Bearings for rotating anodes
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- Sliding-Contact Bearings (AREA)
Abstract
本发明公开了一种大承载径向液态金属轴承，包括轴径和轴套，所述轴径设置在所述轴套内，所述轴径的外圆周面设置有槽纹；所述槽纹包括人字槽和八字槽，所述人字槽和/或八字槽设置在所述轴径的外圆周面；本发明通过设置八字槽，在轴径的中部增加了承载面积，在满足主承载区润滑的情况下增大了液态金属轴承的承载能力，提升了旋转速度，也提升了CT检测的效率。
The invention discloses a large-load radial liquid metal bearing, comprising a shaft diameter and a shaft sleeve, the shaft diameter is arranged in the shaft sleeve, and the outer circumferential surface of the shaft diameter is provided with grooves; the grooves Including a herringbone slot and a character-eight slot, the herringbone slot and/or the character-eight slot are arranged on the outer circumferential surface of the shaft diameter; the present invention increases the bearing area in the middle of the shaft diameter by setting the character-eight slot, and meets the main load In the case of regional lubrication, the bearing capacity of the liquid metal bearing is increased, the rotation speed is increased, and the efficiency of CT detection is also improved.
Description
Technical Field
The invention relates to the field of bearing transmission, in particular to a large-bearing radial liquid metal bearing.
Background
The rotating target X-ray tube is a high-power X-ray tube and is used in a rotating CT machine, and when the X-ray tube works, the rotating target generates X-rays under the bombardment of high-energy electrons. Only 1% of the energy is converted to X-rays and about 99% of the energy is converted to heat. In order to prevent the surface material from being ablated due to the serious heating of the electron bombardment area, a high-speed bearing is required to support the rotating target to rotate at a high speed. At the same time, the high-speed bearing should have good thermal conductivity. The liquid metal bearing adopts liquid metal as a lubricant, has the performances of low friction, high heat conduction, good electric conduction and liquid state maintenance under vacuum, and therefore, as an optimal scheme of a high-speed bearing in a rotary target X-ray tube, the liquid metal bearing comprises a radial bearing and a thrust bearing.
The surface of the traditional radial liquid metal bearing is also provided with a diversion trench for guiding the liquid metal as a lubricant; meanwhile, in the operation of the rotary CT machine, the X-ray tube rotates around the patient at a high speed to generate a large centrifugal load, and the centrifugal load needs to be borne by the radial bearing.
The conventional diversion trench only plays a role in diversion, and even the bearing capacity of the radial bearing can be reduced, if the bearing capacity of the radial bearing is low, the rotation speed of the rotary CT is limited, and the CT detection efficiency is also limited.
Disclosure of Invention
The invention aims to solve the problem that the radial liquid metal bearing has low bearing capacity, and aims to provide a large-bearing radial liquid metal bearing and solve the problem of limiting the rotating speed of a rotating CT.
A large-bearing radial liquid metal bearing comprises a shaft diameter and a shaft sleeve, wherein the shaft diameter is arranged in the shaft sleeve, and grooves are formed in the outer circumferential surface of the shaft diameter;
the grooves comprise herringbone grooves and splayed grooves, and the herringbone grooves and/or the splayed grooves are arranged on the outer circumferential surface of the shaft diameter;
the herringbone groove comprises a first groove and a second groove, the outer end of the first groove is communicated with the first end surface of the shaft diameter, the outer end of the second groove is communicated with the second end surface of the shaft diameter, the inner end of the first groove is communicated with the inner end of the second groove, and an included angle between the first groove and the second groove is an acute angle;
the splayed groove comprises a first side groove and a second side groove, the outer end of the first side groove is communicated with the first end face of the shaft diameter, the outer end of the second side groove is communicated with the second end face of the shaft diameter, the inner end of the first side groove is not communicated with the inner end of the second side groove, and the extension line of the first side groove is acute-angled with the included angle between the extension lines of the second side groove.
Specifically, the depth of the first groove, the depth of the second groove, the depth of the first side groove and the depth of the second side groove are all equal, and the depth of the first groove is 10-50 micrometers.
Preferably, the length of the first groove is equal to that of the second groove, and the inner end of the first groove and the inner end of the second groove are both arranged on the middle section of the shaft diameter.
Specifically, the length of the first side groove is equal to that of the second side groove, and the distance between the inner end of the first side groove and the middle section of the shaft diameter is equal to that between the inner end of the second side groove and the middle section of the shaft diameter.
Specifically, the length of the first side groove is smaller than the length of the first groove.
As an embodiment, the flutes on the outer circumference of the shaft diameter are provided as a plurality of the splay grooves, a plurality of the first side grooves are all provided in parallel, and a plurality of the second side grooves are all provided in parallel.
Specifically, the distance between two adjacent first side grooves is equal, and the distance between two adjacent second side grooves is equal.
As another embodiment, the grooves of the outer circumference of the shaft diameter are provided as a plurality of the herringbone grooves and a plurality of the splay grooves, the herringbone grooves and the splay grooves are sequentially provided at intervals, a plurality of the first side grooves and a plurality of the first grooves are all provided in parallel, and a plurality of the second side grooves and a plurality of the second grooves are all provided in parallel.
Specifically, the distance between the first side groove and two adjacent first grooves is equal, and the distance between the second side groove and two adjacent second grooves is equal.
As another embodiment, the splayed grooves include short splayed grooves and long splayed grooves, and a plurality of the short splayed grooves and a plurality of the long splayed grooves are sequentially arranged on the outer circumferential surface of the shaft diameter at intervals;
the short splayed groove comprises a first short side groove and a second short side groove, the outer end of the first short side groove is communicated with the first end face of the shaft diameter, the outer end of the second short side groove is communicated with the second end face of the shaft diameter, and an included angle between an extension line of the first short side groove and an extension line of the second short side groove is an acute angle;
the long splayed groove comprises a first long side groove and a second long side groove, the outer end of the first long side groove is communicated with the first end face of the shaft diameter, the outer end of the second long side groove is communicated with the second end face of the shaft diameter, and an included angle between an extension line of the first long side groove and an extension line of the second long side groove is an acute angle;
the length of the first short side groove is equal to that of the second short side groove, the length of the first long side groove is equal to that of the second long side groove, the length of the first groove is equal to that of the second groove, the length of the first short side groove is smaller than that of the first long side groove, and the length of the first long side groove is smaller than that of the first groove.
Compared with the prior art, the bearing area is increased in the middle of the shaft diameter by arranging the splayed groove, the bearing capacity of the liquid metal bearing is increased under the condition that lubrication of a main bearing area is met, the rotating speed is improved, and the CT detection efficiency is also improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the principles of the invention.
Fig. 1 is a schematic structural diagram of a high load-bearing radial liquid metal bearing according to the present invention.
Fig. 2 is a schematic structural diagram of a first embodiment according to the present invention.
Fig. 3 is a schematic structural diagram of a second embodiment according to the present invention.
Fig. 4 is a schematic structural diagram of a third embodiment according to the present invention.
Reference numerals: 1-shaft sleeve, 2-shaft diameter, 3-flute, 4-first side groove, 5-second side groove, 6-first groove, 7-second groove, 41-first long side groove, 42-first short side groove, 51-second long side groove and 52-second short side groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the invention.
It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
In the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
A large-bearing radial liquid metal bearing comprises a shaft diameter 2 and a shaft sleeve 1, wherein the shaft diameter 2 is arranged in the shaft sleeve 1, and grooves 3 are formed in the outer circumferential surface of the shaft diameter 2;
as shown in fig. 1, the grooves 3 of the prior art typically include only chevron-shaped grooves that push the liquid metal within the bearing gap to concentrate the liquid metal toward the middle section during high speed rotation of the shaft diameter 2.
The middle end of the bearing is a main bearing section, a large centrifugal force load needs to be borne, the bearing capacity is in direct proportion to the bearing area, and if grooving is carried out on the middle section, the bearing area of a main bearing area is reduced, and the bearing capacity is influenced.
The area of the herringbone groove in the main bearing area is reduced to be in proportion to the total area of the main bearing area.
The herringbone groove comprises a first groove 6 and a second groove 7, the outer end of the first groove 6 is communicated with the first end face of the shaft diameter 2, the outer end of the second groove 7 is communicated with the second end face of the shaft diameter 2, the inner end of the first groove 6 is communicated with the inner end of the second groove 7, and an included angle between the first groove 6 and the second groove 7 is an acute angle;
the herringbone groove in the present stage is constructed as described above, and under the rotation of the shaft diameter 2, the liquid metal in the vicinity of the outer end of the first groove 6 and the outer end of the second groove 7 flows into the inner end of the first groove 6 and the inner end of the second groove 7 along the herringbone groove.
In the embodiment of the present invention, a groove 3, i.e., a chevron groove, is additionally provided.
The groove line 3 comprises a herringbone groove and a splayed groove, and the herringbone groove and/or the splayed groove are/is arranged on the outer circumferential surface of the shaft diameter 2;
the splayed groove comprises a first side groove 4 and a second side groove 5, the outer end of the first side groove 4 is communicated with the first end face of the shaft diameter 2, the outer end of the second side groove 5 is communicated with the second end face of the shaft diameter 2, the inner end of the first side groove 4 is not communicated with the inner end of the second side groove 5, and the included angle between the extension line of the first side groove 4 and the extension line of the second side groove 5 is an acute angle.
The structure of the splayed groove is shown in fig. 2, and the inner ends of the side groove of the first side groove 4 and the second side groove 5 are not communicated, namely the area of the main bearing section is not reduced.
The depth of the first groove 6, the depth of the second groove 7, the depth of the first side groove 4 and the depth of the second side groove 5 are all equal, and the depth of the first groove 6 is 10-50 microns.
The 10-50 microns can ensure that the relative motion between the shaft diameter 2 and the shaft sleeve 1 is not influenced to a certain degree, and simultaneously can ensure that the liquid metal can move in the herringbone groove and the splayed groove.
The depth of each groove is set to be the same, so that the phenomenon that the liquid metal is stressed unevenly in the groove grains 3 to influence the performance of the bearing can be avoided.
The length of the first groove 6 is equal to that of the second groove 7, the inner end of the first groove 6 and the inner end of the second groove 7 are both arranged on the middle section of the shaft diameter 2, the length of the first side groove 4 is equal to that of the second side groove 5, the distance between the inner end of the first side groove 4 and the middle section of the shaft diameter 2 is equal to that between the inner end of the second side groove 5 and the middle section of the shaft diameter 2, and the length of the first side groove 4 is smaller than that of the first groove 6.
The herringbone groove and the splayed groove are arranged to be of symmetrical structures, so that the two ends of the shaft diameter 2 are stressed equally, and the condition that the stress at the two ends is uneven and extra stress is generated is avoided.
Based on the mating of the herringbone grooves and the octagonal grooves, a detailed description of various embodiments is provided below.
Example one
In this embodiment, only the octagon groove is adopted, that is, as shown in fig. 2, the flutes 3 on the outer circumference of the shaft diameter 2 are provided as a plurality of octagon grooves, the first side grooves 4 are all arranged in parallel, the second side grooves 5 are all arranged in parallel, the distance between two adjacent first side grooves 4 is equal, and the distance between two adjacent second side grooves 5 is equal.
The first side groove 4 and the second side groove 5 are not communicated, so that the area of the main bearing section (namely, the middle section in the figure) of the shaft diameter 2 is increased relative to the prior art, and the bearing capacity is improved.
Meanwhile, the diversion trenches on the two sides are reserved (splayed trenches), so that under the condition that the shaft diameter 2 rotates, liquid metal is continuously supplied to the middle section, and sufficient lubricant in the middle section of the main bearing area is ensured.
It should be noted that the direction of rotation of the shaft diameter 2 is decisive for the flow of the liquid metal, and as shown in fig. 2, it is ensured that the liquid metal will flow into the intermediate section along the first side channel 4 and the second side channel 5 only if the shaft diameter 2 is rotated counterclockwise.
Example two
Although the first embodiment increases the load carrying capacity of the main load carrying section, another problem arises because all of the channels are in communication with the main load carrying section, and there may be insufficient lubricant in the main load carrying section.
In the embodiment, a combination of herringbone grooves and splayed grooves is adopted, the grooves 3 on the outer circumference of the shaft diameter 2 are provided with a plurality of herringbone grooves and a plurality of splayed grooves which are arranged at intervals in sequence, a plurality of first side grooves 4 and a plurality of first grooves 6 are arranged in parallel, a plurality of second side grooves 5 and a plurality of second grooves 7 are arranged in parallel, the distance between the first side groove 4 and two adjacent first grooves 6 is equal, and the distance between the second side groove 5 and two adjacent second grooves 7 is equal.
As shown in fig. 3, the zigzag grooves and the splayed grooves are arranged alternately, so that the area of the main bearing section can be increased to a certain extent relative to the prior art, and the amount of liquid metal flowing to the main bearing section can be increased to a certain extent relative to the first embodiment, thereby reaching the intermediate point between the first embodiment and the prior art.
In addition, in the embodiment, the combination form of the chevron grooves and the herringbone grooves is as follows: the herringbone grooves, the splayed grooves, the herringbone grooves and the splayed grooves … … are sequentially arranged at intervals.
In reality, the combination form can also be changed according to the requirement, for example:
if the area of the main bearing section needs to be increased, the combination form can be adopted as follows: the herringbone groove-the splay groove-the herringbone groove … … increases the number of the splay grooves.
If it is desired to increase the supply of liquid metal, the combination can be used: the herringbone grooves, the splayed grooves, the herringbone grooves and the splayed grooves … … increase the number of the herringbone grooves.
EXAMPLE III
The embodiment is an optimization for the first embodiment, that is, under the condition that the splayed grooves are adopted, the bearing capacity can be adjusted.
In the embodiment, the splayed grooves are divided into short splayed grooves and long splayed grooves, and a plurality of short splayed grooves and a plurality of long splayed grooves are sequentially arranged on the outer circumferential surface of the shaft diameter 2 at intervals;
similar to the structure of the second embodiment, the combination of the short splayed groove and the long splayed groove can be adjusted according to the area requirement of the main bearing section or the supply requirement of the liquid metal.
The following is a brief explanation of the example in which short and long splayed grooves are sequentially spaced, as shown in fig. 4.
The short splayed groove comprises a first short side groove 42 and a second short side groove 52, the outer end of the first short side groove 42 is communicated with the first end face of the shaft diameter 2, the outer end of the second short side groove 52 is communicated with the second end face of the shaft diameter 2, and the included angle between the extension line of the first short side groove 42 and the extension line of the second short side groove 52 is an acute angle;
the long splayed groove comprises a first long-side groove 41 and a second long-side groove 51, the outer end of the first long-side groove 41 is communicated with the first end face of the shaft diameter 2, the outer end of the second long-side groove 51 is communicated with the second end face of the shaft diameter 2, and an included angle between the extension line of the first long-side groove 41 and the extension line of the second long-side groove 51 is an acute angle;
the length of the first short side groove 42 is equal to the length of the second short side groove 52, the length of the first long side groove 41 is equal to the length of the second long side groove 51, the length of the first groove 6 is equal to the length of the second groove 7, the length of the first short side groove 42 is smaller than the length of the first long side groove 41, and the length of the first long side groove 41 is smaller than the length of the first groove 6.
The use of the splayed groove can avoid reducing the bearing area of the main bearing section as much as possible, and simultaneously, the supply amount of the liquid metal can be adjusted by arranging the long splayed groove.
Meanwhile, in actual use, the lengths of the first long side groove 41 and the first short side groove 42 can be adjusted according to requirements, the area of the bearing area can be regulated and controlled through different length combinations, and a better adjusting range is achieved.
In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of description and are not intended to limit the scope of the invention. It will be apparent to those skilled in the art that other variations or modifications may be made on the above invention and still be within the scope of the invention.
Claims (10)
1. A large-bearing radial liquid metal bearing comprises a shaft diameter and a shaft sleeve, wherein the shaft diameter is arranged in the shaft sleeve, and the large-bearing radial liquid metal bearing is characterized in that grooves are formed in the outer circumferential surface of the shaft diameter;
the grooves comprise herringbone grooves and splayed grooves, and the herringbone grooves and/or the splayed grooves are arranged on the outer circumferential surface of the shaft diameter;
the herringbone groove comprises a first groove and a second groove, the outer end of the first groove is communicated with the first end surface of the shaft diameter, the outer end of the second groove is communicated with the second end surface of the shaft diameter, the inner end of the first groove is communicated with the inner end of the second groove, and an included angle between the first groove and the second groove is an acute angle;
the splayed groove comprises a first side groove and a second side groove, the outer end of the first side groove is communicated with the first end face of the shaft diameter, the outer end of the second side groove is communicated with the second end face of the shaft diameter, the inner end of the first side groove is not communicated with the inner end of the second side groove, and the extension line of the first side groove is acute-angled with the included angle between the extension lines of the second side groove.
2. A high load-bearing radial liquid metal bearing as claimed in claim 1, wherein the depth of said first groove, the depth of said second groove, the depth of said first side groove and the depth of said second side groove are all equal, and the depth of said first groove is 10-50 μm.
3. A high load-bearing radial liquid metal bearing as claimed in claim 1, wherein said first groove has a length equal to a length of said second groove, and wherein an inner end of said first groove and an inner end of said second groove are both disposed on a mid-section of said shaft diameter.
4. A high load-bearing radial liquid metal bearing as claimed in claim 3, wherein said first side groove has a length equal to that of said second side groove, and the distance between the inner end of said first side groove and the middle section of said shaft diameter is equal to that of said second side groove.
5. A high load bearing radial liquid metal bearing according to claim 4 wherein said first side groove has a length less than the length of said first groove.
6. A high load-bearing radial liquid metal bearing as claimed in claim 1, wherein said grooves of the outer circumference of said shaft diameter are provided as a plurality of said splayed grooves, a plurality of said first side grooves are provided in parallel, and a plurality of said second side grooves are provided in parallel.
7. A high load radial liquid metal bearing according to claim 6, wherein the distance between two adjacent first side grooves is equal, and the distance between two adjacent second side grooves is equal.
8. A high load-bearing radial liquid metal bearing as claimed in claim 1, wherein said grooves of said outer circumference of said shaft diameter are provided as a plurality of said herringbone grooves and a plurality of said splay grooves, said herringbone grooves and said splay grooves being sequentially spaced apart, a plurality of said first side grooves and a plurality of said first grooves being arranged in parallel, a plurality of said second side grooves and a plurality of said second grooves being arranged in parallel.
9. A high load radial liquid metal bearing as claimed in claim 8, wherein said first side groove is equidistant from two adjacent first grooves and said second side groove is equidistant from two adjacent second grooves.
10. The heavy duty radial liquid metal bearing of claim 6, wherein said chevron grooves include short and long chevron grooves, a plurality of said short and long chevron grooves being sequentially spaced apart on the outer circumferential surface of said shaft diameter;
the short splayed groove comprises a first short side groove and a second short side groove, the outer end of the first short side groove is communicated with the first end face of the shaft diameter, the outer end of the second short side groove is communicated with the second end face of the shaft diameter, and an included angle between an extension line of the first short side groove and an extension line of the second short side groove is an acute angle;
the long splayed groove comprises a first long side groove and a second long side groove, the outer end of the first long side groove is communicated with the first end face of the shaft diameter, the outer end of the second long side groove is communicated with the second end face of the shaft diameter, and an included angle between an extension line of the first long side groove and an extension line of the second long side groove is an acute angle;
the length of the first short side groove is equal to that of the second short side groove, the length of the first long side groove is equal to that of the second long side groove, the length of the first groove is equal to that of the second groove, the length of the first short side groove is smaller than that of the first long side groove, and the length of the first long side groove is smaller than that of the first groove.
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| CN202110409849.4A CN113161217B (en) | 2021-04-16 | 2021-04-16 | A large load radial liquid metal bearing |
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| CN202110409849.4A CN113161217B (en) | 2021-04-16 | 2021-04-16 | A large load radial liquid metal bearing |
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