CN119267447B - A method for assembling a liquid metal bearing - Google Patents
A method for assembling a liquid metal bearing Download PDFInfo
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- CN119267447B CN119267447B CN202411817908.1A CN202411817908A CN119267447B CN 119267447 B CN119267447 B CN 119267447B CN 202411817908 A CN202411817908 A CN 202411817908A CN 119267447 B CN119267447 B CN 119267447B
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- inner shaft
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- alloy
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- 229910001338 liquidmetal Inorganic materials 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000007788 liquid Substances 0.000 claims description 24
- 229910045601 alloy Inorganic materials 0.000 claims description 15
- 239000000956 alloy Substances 0.000 claims description 15
- 229910002058 ternary alloy Inorganic materials 0.000 claims description 12
- 230000005496 eutectics Effects 0.000 claims description 10
- 229910001128 Sn alloy Inorganic materials 0.000 claims description 8
- 239000011261 inert gas Substances 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000006023 eutectic alloy Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 5
- 239000013078 crystal Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000007667 floating Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000004806 packaging method and process Methods 0.000 abstract description 8
- 230000001050 lubricating effect Effects 0.000 abstract description 3
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 13
- 229910052733 gallium Inorganic materials 0.000 description 13
- 238000005461 lubrication Methods 0.000 description 13
- 238000005538 encapsulation Methods 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 229910001092 metal group alloy Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- AJNVQOSZGJRYEI-UHFFFAOYSA-N digallium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Ga+3].[Ga+3] AJNVQOSZGJRYEI-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910001195 gallium oxide Inorganic materials 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C43/00—Assembling bearings
- F16C43/02—Assembling sliding-contact bearings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
The invention discloses an assembly method of a liquid metal bearing, which comprises the following steps of 1) placing an inner hole of an outer shaft sleeve upwards, injecting liquid metal into the inner hole, inserting the lower end of an inner shaft into the inner hole of the outer shaft sleeve, 2) sleeving an end cover and a gasket on the inner shaft, fixing the end cover and the gasket together by using a fixing tool, 3) reversing the outer shaft sleeve and the inner shaft upside down, placing the inner hole of the outer shaft sleeve downwards, arranging the end cover and the gasket below an outer shaft sleeve and an annular boss, 4) injecting liquid metal into a cavity surrounded by the gasket and the inner shaft, compressing the outer shaft sleeve, the gasket and the end cover together, inserting the annular boss into the gasket, and 5) fixing the outer shaft sleeve, the gasket and the end cover together by using a fastener. The assembly method of the liquid metal bearing can ensure that the lubricating gaps at the two sides of the annular boss are filled with the liquid metal, and realize good packaging of the liquid metal.
Description
Technical Field
The invention relates to an assembly method of a liquid metal bearing, and belongs to the technical field of liquid metal bearings.
Background
Gallium-based liquid alloys are widely used as lubricants for bearing systems. Because the liquid gallium-based alloy has good fluidity, the bearing system can operate under smaller resistance, can realize high-speed movement, and can achieve 30000 rpm. Since the liquid gallium-based alloy has a very wide liquid phase interval and is less volatile at high temperatures, it can be used for a long period of time at high temperatures. Because the liquid gallium-based alloy has good heat conducting property, heat can be transferred to a load with heat input, and the liquid gallium-based alloy can be effectively cooled. Therefore, gallium-based liquid metal bearings are widely used in industrial CT, medical CT, etc. inner rotating target disks and hard disks.
Gallium-based liquid metals have several characteristics that lead to the need for high vacuum systems or argon protection during packaging and use.
1. Gallium-based metal is easily oxidized, and an oxide film is formed on the surface.
2. The oxide film causes the apparent viscosity of the liquid gallium metal alloy to become large, resulting in an increase in bearing resistance.
3. Liquid gallium metal tends to absorb water in a humid environment. The hydrogen atoms dissolve in the liquid gallium metal alloy and oxygen combines with gallium to form gallium oxide. Under the vacuum high temperature condition, dissolved hydrogen atoms are collected and separated into hydrogen molecules which overflow in a gas form to cause the damage of a vacuum system, and electron beams generate ionization discharge to influence the normal work of a CT light source.
At present, the accurate control of the components of the gallium-indium-tin liquid alloy also has a certain problem.
1. Gallium is a liquid and indium and tin are solids at room temperature. The oxide layer exists on the surfaces of the indium and the tin ingots, and is not easy to remove. Therefore, when preparing a gallium-indium-tin liquid alloy, the presence of oxides in the alloy liquid needs to be removed. During the oxide removal process, the composition is inevitably fluctuated.
2. The gallium-indium-tin liquid alloy hopes to obtain the composition of the eutectic point, thereby ensuring that the liquid metal cannot solidify and avoiding damaging the bearing. But the composition is inconvenient to measure during the actual alloy configuration process. Therefore, the components have small deviation, the deviation of the components is easy to cause the rise of the phase change point, and the liquid metal is solidified.
As disclosed in patent document 1 (publication No. CN117628054 a), the liquid metal bearing is generally limited to radial runout by a friction pair bearing assembled by an inner shaft and an outer shaft, and is limited to axial movement by an annular boss, and an annular gasket (spacer ring) is provided on the periphery of the annular boss. The liquid metal bearing has a simple structure, can greatly improve machining precision, smoothness, concentricity and the like, and improves grinding precision, but has difficulties in packaging liquid metal.
1. The gallium-indium-tin alloy has small viscosity and good fluidity, and the surface tension is about 600N/m.
2. Because the gap between the sliding contact surfaces of the bearings is only tens of micrometers, and meanwhile, the surface tension of the gallium-indium-tin alloy is large, so that the liquid metal needs very large hydrostatic pressure to fill the whole gap from one end of the bearings (for example, a liquid metal bearing filling tool disclosed in Chinese patent publication No. CN221033677U adopts the mode).
3. Under huge hydrostatic pressure effect, liquid metal liquid overflows easily from the assembly gap, leads to the metal liquid quality control inaccurate to the condition that the metal liquid can not cover friction pair lubrication surface completely easily appears.
4. The two sides of the annular boss are formed into two chambers (lubrication gaps) for containing liquid metal, and when one end of the outer shaft is injected with the liquid metal, the two chambers are difficult to be filled with the liquid metal, so that the packaging is difficult to realize, and the capacity of packaging the liquid metal is more difficult to accurately control. The bearings operate at high temperatures and there is a risk of the excess liquid metal expanding over and damaging the bearings.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides an assembly method of a liquid metal bearing, which is favorable for realizing good packaging of liquid metal.
The assembly method of the liquid metal bearing comprises an outer shaft sleeve, an inner shaft, an end cover and a gasket, wherein one end of the inner shaft is positioned in the outer shaft sleeve, the inner shaft is provided with an annular boss, the gasket is positioned at the periphery of the annular boss, and the gasket is fixed between the outer shaft sleeve and the end cover;
the method is characterized by comprising the following steps of:
1) Placing the inner hole of the outer shaft sleeve upwards, injecting liquid metal into the inner hole, and inserting the lower end of the inner shaft into the inner hole of the outer shaft sleeve;
2) The end cover and the gasket are sleeved on the inner shaft, and the end cover and the gasket are fixed together by using a fixing tool;
3) The outer shaft sleeve and the inner shaft are turned upside down, so that the inner hole of the outer shaft sleeve is downwards placed, and the end cover and the gasket are positioned below the outer shaft sleeve and the annular boss;
4) Injecting liquid metal into a cavity surrounded by the gasket and the inner shaft, pressing the outer shaft sleeve, the gasket and the end cover together, and inserting the annular boss into the gasket;
5) And the outer shaft sleeve, the gasket and the end cover are fixedly connected together by using a fastener.
By adopting the technical scheme, the lubricating gap among the outer shaft sleeve, the inner shaft and the annular boss is filled with the liquid metal, the redundant liquid metal overflows from the gap between the outer shaft sleeve and the annular boss, then the inner hole of the outer shaft sleeve faces downwards after the outer shaft sleeve is reversed, the characteristic that the surface tension of the liquid metal is large is creatively utilized at the moment, and the liquid metal cannot flow out of the inner hole of the outer shaft sleeve. And filling the lubrication gap between the gasket and the annular boss and the lubrication gap between the end cover and the inner shaft with liquid metal. According to the invention, the lubrication gaps at two sides of the annular boss are filled in two stages, the filling quantity of the liquid metal is completely the same as the volume of the bearing lubrication gap, and good packaging of the liquid metal is ensured.
Preferably, each of the above steps of assembly is performed in a vacuum environment or in an oxygen-free inert gas atmosphere. The vacuum environment or inert gas environment may avoid the formation of an oxide layer in the liquid metal.
Further, the step 1) is performed in a closed space, and vacuum is pumped to the closed space before the lower end of the inner shaft is inserted into the inner hole of the outer sleeve. The inner shaft can fall under the action of gravity after being vacuumized in the airtight space, the lower end of the inner shaft is inserted into the inner hole of the outer shaft sleeve in a vacuum state and extrudes the injected liquid metal, so that the liquid metal fills a gap between the outer shaft sleeve and the inner shaft. After the lower end of the inner shaft is inserted into the inner bore of the outer sleeve, the gap between the inner shaft and the outer sleeve is filled up against the obstruction of liquid metal capillary action by the pressure exerted by the press. The process of applying pressure by the press machine can be carried out in a vacuum airtight space, and can also be carried out under the protection of inert gas filled in the airtight space.
Further, the outer peripheral surface of the gasket is provided with a groove, and the fixing tool is provided with two clamping jaws, wherein one clamping jaw is abutted against the outer end face of the end cover, and the other clamping jaw is abutted against the groove. Through setting up the recess, can avoid jack catch and outer sleeve to take place to interfere.
Further, in the step 1), the lower end of the inner shaft is inserted into the inner hole of the outer sleeve by using a press, and the lower end of the inner shaft is stopped when reaching a designed position. The process of applying pressure by the press machine can be carried out in a vacuum airtight space, and can also be carried out under the protection of inert gas filled in the airtight space.
Further, in the step 5), the excess liquid metal is removed before the fastener is locked.
Further, the fastener is a bolt.
Further, the liquid metal adopts gallium-indium-tin ternary alloy, and the preparation method of the liquid metal comprises the following steps:
S1, referring to a designed gallium-indium-tin ternary eutectic alloy, when in batching, the addition amount of Ga is larger than that of the designed gallium-indium-tin ternary eutectic alloy, so as to form an alloy with excessive Ga;
S2, melting the Ga-in-Sn ternary alloy with excessive Ga in a vacuum container, heating to above 100 ℃ higher than the melting temperature, uniformly mixing, cooling to 0.2-6 ℃ higher than the eutectic point temperature in the vacuum container, and removing the crystal Ga particles floating on the metal liquid surface in a filtering mode;
S3, continuously cooling the gallium-indium-tin ternary alloy In a vacuum container until 90-97% of the Ga-In-Sn alloy is solidified, and pouring out the residual liquid;
s4, repeating the step S2 and the step S3 at least once;
And S5, finally heating the liquid metal in the vacuum container to a temperature 10-20 ℃ higher than the eutectic point, and obtaining the liquid metal melted at the temperature for bearing encapsulation.
Preferably, in step S2, cooling is performed in a vacuum vessel to a temperature of 0.5-2 degrees above the eutectic point temperature.
Preferably, in step S3, the gallium-indium-tin ternary alloy is cooled to 94% -96% by volume of the Ga-In-Sn alloy solidification In a vacuum vessel.
Preferably, in step S4, steps S2 and S3 are repeated twice.
Compared with the prior art, the assembly method of the liquid metal bearing can ensure that the lubrication gaps at two sides of the annular boss are filled with liquid metal, so that good packaging of the liquid metal is realized, meanwhile, the purity of the gallium-indium-tin liquid alloy is improved by utilizing a control means of components and processes, the impurity content and the moisture of the gallium-indium-tin liquid alloy are reduced, and the high-temperature working performance of the liquid metal bearing is improved.
Drawings
FIG. 1 is a cross-sectional view of a liquid metal bearing of the present invention;
FIG. 2 is a cross-sectional view of the outer sleeve;
FIG. 3 is a cross-sectional view of the inner shaft;
FIG. 4 is a schematic illustration of the injection of liquid metal into an outer sleeve;
FIG. 5 is a schematic illustration of insertion of an inner shaft into an outer hub;
FIG. 6 is a schematic illustration of the injection of liquid metal into the cavity between the washer and the inner shaft;
FIG. 7 is a schematic illustration of the insertion of an annular boss into the cavity formed by the gasket and the end cap;
FIG. 8 is a schematic view of securing an outer sleeve, gasket and end cap with fasteners.
In the figure, an outer shaft sleeve 1, an inner hole 1.1, an inner shaft 2, an annular boss 2.1, an end cover 3, a gasket 4, a fixing tool 5, a cavity 6, a measuring tool 7 and a press 8 are arranged.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
Referring to fig. 1-3, the liquid metal bearing comprises an outer shaft sleeve 1, an inner shaft 2, an end cover 3 and a gasket 4, one end of the inner shaft 2 is positioned in the outer shaft sleeve 1, the inner shaft 2 is provided with an annular boss 2.1, the gasket 4 is positioned at the periphery of the annular boss 2.1, the gasket 4 is fixed between the outer shaft sleeve 1 and the end cover 3, the end cover 3 is sleeved on the inner shaft 2, the inner shaft 2 can rotate relative to the outer shaft sleeve 1, the end cover 3 and the gasket 4 in a use state, the liquid metal plays a role in lubrication, the liquid metal is positioned in a gap between the outer shaft sleeve 1 and the inner shaft 2, the gasket 4 is positioned in a gap between the end cover 3 and the inner shaft 2, a sealing structure is arranged on the end cover 3, the sealing structure prevents the liquid metal from leaking from the end cover 3 and the inner shaft 2, and the sealing structure adopts the prior art.
Referring to fig. 1-8, the method of assembling a liquid metal bearing includes the steps of:
1) As shown in fig. 4-5, the inner hole 1.1 of the outer sleeve 1 is placed upwards, excess liquid metal (red part) is injected into the inner hole 1.1 by a container or measuring tool 7 (the volume of injected liquid metal is larger than the lubrication clearance volume between the outer sleeve and the inner shaft), the closed space is vacuumized before the lower end of the inner shaft 2 is inserted into the inner hole 1.1 of the outer sleeve 1, and the outer sleeve 1 and the inner shaft 2 are assembled in the closed space. The inner shaft 2 can fall under the action of gravity after being vacuumized in the sealed space, the lower end of the inner shaft 2 is inserted into the inner hole 1.1 of the outer shaft sleeve 1 in a vacuum state and extrudes the injected gallium-indium-tin liquid metal, so that the liquid metal fills the gap between the outer shaft sleeve 1 and the inner shaft 2. After the lower end of the inner shaft 2 has been inserted into the inner bore 1.1 of the outer sleeve 1, the gap between the inner shaft 2 and the outer sleeve 1 is filled up against the obstruction of liquid metal capillary action by the pressure exerted by the press. The process of applying pressure by the press machine can be carried out in a vacuum airtight space, and can also be carried out under the protection of inert gas filled in the airtight space;
2) As shown in fig. 4 and 5, the end cover 3 and the gasket 4 are sleeved at the upper end of the inner shaft 2, the end cover 3 and the gasket 4 are fixed together by the fixing tool 5, and the contact surface between the end cover 3 and the gasket 4 has high smoothness and flatness, so that liquid metal cannot leak in a gap between the end cover 3 and the gasket 4;
3) As shown in fig. 6, the outer shaft sleeve 1 and the inner shaft 2 are turned upside down, so that the inner hole 1.1 of the outer shaft sleeve 1 is downwards placed, and the liquid metal encapsulated in the outer shaft sleeve 1 cannot flow out due to the larger surface tension of the liquid metal;
4) As shown in fig. 6-7, excessive liquid metal (the volume of the injected liquid metal is larger than the lubrication clearance volume between the inner shaft and the gasket and the end cover) is injected into a cavity 6 enclosed by the gasket 4 and the inner shaft 2, the outer shaft sleeve 1, the gasket 4 and the end cover 3 are tightly pressed together, and the annular boss 2.1 is inserted into the gasket 4;
5) As shown in fig. 8, the outer sleeve 1, the gasket 4 and the end cover 3 are fixedly connected together by using fasteners (preferably bolts), and the fixing tool 5 is removed.
By adopting the technical scheme, the lubricating gap among the outer shaft sleeve 1, the inner shaft 2 and the annular boss 2.1 is filled with the liquid metal, the redundant liquid metal overflows from the gap between the outer shaft sleeve 1 and the annular boss 2.1, then the inner hole 1.1 of the outer shaft sleeve 1 faces downwards after the outer shaft sleeve 1 is reversed, the characteristic that the surface tension of the liquid metal is large is creatively utilized at the moment, and the liquid metal cannot flow out of the inner hole 1.1 of the outer shaft sleeve 1. The lubrication gap between the gasket 4 and the annular boss 2.1, and the lubrication gap between the end cap 3 and the inner shaft 2 are then filled with liquid metal. The invention fills the lubrication gaps at the two sides of the annular boss 2.1 in two stages, thereby ensuring good encapsulation of liquid metal.
In one embodiment, each step of the assembly is performed in a vacuum environment with a vacuum degree of 0.01Pa to 0.0001Pa or in a high-purity Ar inert gas (with a purity of 99.995) protection environment. The formation of an oxide layer in the liquid metal can be avoided in a vacuum environment or in an oxygen-free inert gas-protected environment.
In one embodiment, the step 1) is performed in a closed space, and the closed space is evacuated before the lower end of the inner shaft 2 is inserted into the inner hole 1.1 of the outer sleeve 1, and then the inert gas is filled in the closed space after the lower end of the inner shaft 2 is inserted into the inner hole 1.1 of the outer sleeve 1. After the vacuum is pumped in the closed space, the inner shaft 2 can fall under the action of gravity to extrude the liquid metal, and then the press applies pressure to press the inner shaft 2 into the inner cavity of the outer shaft sleeve 1, so that the gap between the inner shaft 2 and the outer shaft sleeve 1 can be filled with the liquid metal.
Preferably, in step 1), the lower end of the inner shaft 2 is inserted into the inner bore 1.1 of the outer sleeve 1 using the press 8, the lower end of the inner shaft 2 being stopped to the design position.
In one embodiment, the liquid metal is gallium-indium-tin ternary alloy, and the preparation method of the liquid metal comprises the following steps of:
S1, referring to a designed gallium-indium-tin ternary eutectic alloy, when in batching, the addition amount of Ga is larger than that of the designed gallium-indium-tin ternary eutectic alloy, so as to form an alloy with excessive Ga;
S2, melting the Ga-in-Sn ternary alloy with excessive Ga in a vacuum container, heating to above 100 ℃ higher than the melting temperature, uniformly mixing, cooling to 0.2 ℃ higher than the eutectic point temperature in the vacuum container, and removing the crystal Ga particles floating on the metal liquid surface in a filtering mode;
s3, continuously cooling the gallium-indium-tin ternary alloy In a vacuum container until 90% of the Ga-In-Sn alloy is solidified, and pouring out the residual liquid;
S4, repeating the step S2 and the step S3 twice;
and S5, finally heating the liquid metal in the vacuum container to a temperature 10 ℃ higher than the eutectic point, and obtaining the liquid metal melted at the temperature for bearing encapsulation. Preferably, the vacuum degree of the vacuum container is 0.01 Pa-0.0001 Pa
In the step S2, the liquid metal with less impurities is prepared after the liquid metal is cooled to 0.5 degree, 2 degree and 6 degree higher than the eutectic point temperature In a vacuum container, and In the step S3, the gallium-indium-tin ternary alloy is cooled to 94%, 96% and 97% of the Ga-In-Sn alloy by volume In the vacuum container for solidification, and the liquid metal with less impurities is prepared.
The embodiments of the present invention have been described above with reference to the accompanying drawings, and the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict. The present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the invention and the scope of the appended claims, which are all within the scope of the invention.
Claims (10)
1. The assembly method of the liquid metal bearing comprises an outer shaft sleeve (1), an inner shaft (2), an end cover (3) and a gasket (4), wherein one end of the inner shaft (2) is positioned in the outer shaft sleeve (1), the inner shaft (2) is provided with an annular boss (2.1), the gasket (4) is positioned at the periphery of the annular boss (2.1), and the gasket (4) is fixed between the outer shaft sleeve (1) and the end cover (3);
the method is characterized by comprising the following steps of:
1) Placing an inner hole (1.1) of the outer sleeve (1) upwards, injecting liquid metal into the inner hole (1.1), and inserting the lower end of the inner shaft (2) into the inner hole (1.1) of the outer sleeve (1);
2) The end cover (3) and the gasket (4) are sleeved on the inner shaft (2), and the end cover (3) and the gasket (4) are fixed together by using a fixing tool (5);
3) -inverting the outer hub (1) and the inner hub (2) upside down such that the inner bore (1.1) of the outer hub (1) is placed downwards, the end cap (3) and the gasket (4) being located below the outer hub (1), the annular boss (2.1);
4) Injecting liquid metal into a cavity (6) surrounded by the gasket (4) and the inner shaft (2), pressing the outer sleeve (1), the gasket (4) and the end cover (3) together, and inserting the annular boss (2.1) into the gasket (4);
5) And the outer sleeve (1), the gasket (4) and the end cover (3) are fixedly connected together by using a fastener.
2. A method of assembling a liquid metal bearing according to claim 1, wherein each of the steps of assembling are performed in a vacuum environment or in an oxygen-free inert gas atmosphere.
3. A method of assembling a liquid metal bearing according to claim 1, wherein said step 1) is performed in a closed space, and wherein a vacuum is drawn in the closed space before the lower end of said inner shaft (2) is inserted into the inner bore (1.1) of said outer hub (1).
4. The method for assembling a liquid metal bearing according to claim 1, wherein the washer (4) is provided with a groove on the outer peripheral surface thereof, and the fixing tool (5) is provided with two jaws, one of which abuts against the outer end surface of the end cap (3) and the other of which abuts against the groove.
5. Method of assembling a liquid metal bearing according to claim 1, characterized in that in step 1) the lower end of the inner shaft (2) is inserted into the inner bore (1.1) of the outer sleeve (1) by means of a press (8), the lower end of the inner shaft (2) being stopped in the design position.
6. The method of assembling a liquid metal bearing of claim 1, wherein the fastener is a bolt.
7. The method for assembling a liquid metal bearing according to claim 1, wherein the liquid metal is a gallium-indium-tin ternary alloy, and the method for preparing the liquid metal comprises the following steps:
S1, referring to a designed gallium-indium-tin ternary eutectic alloy, when in batching, the addition amount of Ga is larger than that of the designed gallium-indium-tin ternary eutectic alloy, so as to form an alloy with excessive Ga;
S2, melting the Ga-in-Sn ternary alloy with excessive Ga in a vacuum container, heating to above 100 ℃ higher than the melting temperature, uniformly mixing, cooling to 0.2-6 ℃ higher than the eutectic point temperature in the vacuum container, and removing the crystal Ga particles floating on the metal liquid surface in a filtering mode;
S3, continuously cooling the gallium-indium-tin ternary alloy In a vacuum container until 90-97% of the Ga-In-Sn alloy is solidified, and pouring out the residual liquid;
s4, repeating the step S2 and the step S3 at least once;
and S5, finally heating the liquid metal in the vacuum container to a temperature 10-20 ℃ higher than the eutectic point to obtain the liquid metal melted at the temperature.
8. The method of assembling a liquid metal bearing according to claim 7, wherein in step S2, the liquid metal bearing is cooled to a temperature of 0.5-2 degrees above the eutectic point in a vacuum vessel.
9. A method of assembling a liquid metal bearing according to claim 7, wherein In step S3, the gallium-indium-tin ternary alloy is cooled to 94% -96% by volume of the Ga-In-Sn alloy to solidify In a vacuum vessel.
10. The method of assembling a liquid metal bearing according to claim 7, wherein in step S4, steps S2 and S3 are repeated twice.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411817908.1A CN119267447B (en) | 2024-12-11 | 2024-12-11 | A method for assembling a liquid metal bearing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411817908.1A CN119267447B (en) | 2024-12-11 | 2024-12-11 | A method for assembling a liquid metal bearing |
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| Publication Number | Publication Date |
|---|---|
| CN119267447A CN119267447A (en) | 2025-01-07 |
| CN119267447B true CN119267447B (en) | 2025-03-04 |
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| CN202411817908.1A Active CN119267447B (en) | 2024-12-11 | 2024-12-11 | A method for assembling a liquid metal bearing |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114263833A (en) * | 2021-12-01 | 2022-04-01 | 北京智束科技有限公司 | A liquid metal lubricated bearing filling device and method |
| CN117628054A (en) * | 2023-12-29 | 2024-03-01 | 麦默真空技术无锡有限公司 | Liquid metal bearing with reflow holes for balancing internal pressure |
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| JP2930272B2 (en) * | 1992-01-24 | 1999-08-03 | 株式会社東芝 | Rotating anode X-ray tube |
| JP2005273908A (en) * | 2004-02-23 | 2005-10-06 | Nippon Densan Corp | Method and device for filling lubricant into dynamic pressure bearing device and method of filling liquid |
| US8363787B2 (en) * | 2009-03-25 | 2013-01-29 | General Electric Company | Interface for liquid metal bearing and method of making same |
| DE102014218750A1 (en) * | 2014-09-18 | 2016-03-24 | Siemens Aktiengesellschaft | Liquid metal plain bearings |
| CN221033677U (en) * | 2023-11-29 | 2024-05-28 | 麦默真空技术无锡有限公司 | Liquid metal bearing liquid filling tool |
| CN117877952A (en) * | 2023-12-29 | 2024-04-12 | 北京智束科技有限公司 | Liquid metal bearings and X-ray tubes |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114263833A (en) * | 2021-12-01 | 2022-04-01 | 北京智束科技有限公司 | A liquid metal lubricated bearing filling device and method |
| CN117628054A (en) * | 2023-12-29 | 2024-03-01 | 麦默真空技术无锡有限公司 | Liquid metal bearing with reflow holes for balancing internal pressure |
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