CN214698814U - Liquid metal bearing and vacuum motor - Google Patents
Liquid metal bearing and vacuum motor Download PDFInfo
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- CN214698814U CN214698814U CN202121157760.5U CN202121157760U CN214698814U CN 214698814 U CN214698814 U CN 214698814U CN 202121157760 U CN202121157760 U CN 202121157760U CN 214698814 U CN214698814 U CN 214698814U
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- bearing
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Abstract
The utility model discloses a liquid metal bearing and vacuum motor relates to machinery, has solved the leak protection problem between the current liquid metal bearing, and its technical scheme main points are: including first bearing spare and with the second bearing spare that first bearing spare activity cup jointed, form the bearing clearance that supplies liquid metal to fill between first bearing spare and the second bearing spare, the open end inner wall ring of second bearing spare is equipped with a plurality of seal ring grooves, and a plurality of seal ring grooves set up along second bearing spare axis direction interval. The utility model discloses a set up the sealed annular that is located bearing clearance port department between first bearing spare and second bearing spare, under centripetal force and the viscosity effect that bearing operation liquid metal produced, effectively avoided liquid metal to ooze under the internal pressure effect, strengthened the sealing performance between the liquid metal bearing, solved the problem that liquid metal oozes under long-time use or high-speed operation between the liquid metal bearing.
Description
Technical Field
The utility model relates to the field of machinary, more specifically say, it relates to a liquid metal bearing and vacuum motor.
Background
Motors used in space equipment systems, vacuum systems, X-ray tubes need to work in a vacuum environment. In this case, the interior of the motor is also usually vacuum, so that the motor rotor cannot be cooled by using the air cooling adopted by the conventional motor. During the operation of the motor, the rotor of the motor can generate heat due to the copper loss of the rotor. Since air cooling cannot be used to cool the motor rotor, heat is difficult to dissipate. In this case, if the motor is operated under high power, the rotor of the motor is easily burnt. There is therefore a need for an efficient way of conducting away the heat generated by the motor rotor, i.e. to achieve cooling of the motor rotor.
The conventional vacuum motor uses a ball bearing, and the contact area between a ball and a bearing raceway is very small, so that the heat conduction capability of the ball bearing is poor. This limits the power of the vacuum motor, since the greater the power, the greater the heating value of the motor rotor, and the more difficult it is to dissipate the heat. In order to solve the above-mentioned drawbacks, it is well documented that the gap between the bearing members is filled with liquid metal, so that the friction loss between the bearing members can be effectively reduced, and the heat conductivity of the bearing can be improved.
However, since liquid metal has certain fluidity, the requirement for sealing performance between bearing parts is high, and since the bearing parts need to be relatively selected, the problem of leakage prevention between liquid metal bearings has been a problem which is difficult to overcome by relevant researchers. Therefore, how to research and design a liquid metal bearing and a vacuum motor is a problem which is urgently needed to be solved at present.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects in the prior art, the utility model aims to provide a liquid metal bearing and vacuum motor.
The above technical purpose of the present invention can be achieved by the following technical solutions:
the first aspect provides a liquid metal bearing, including first bearing spare and with the second bearing spare that first bearing spare activity cup jointed, form the bearing clearance that supplies liquid metal to fill between first bearing spare and the second bearing spare, the open end inner wall ring of second bearing spare is equipped with a plurality of seal ring grooves, and a plurality of seal ring grooves set up along the interval of second bearing spare axis direction.
Further, the depth of the seal ring groove gradually increases toward the open end of the second bearing.
Furthermore, the sealing ring groove is a trapezoidal groove or a rectangular groove.
Furthermore, the sealing ring grooves are right-angled trapezoidal grooves, and convex teeth formed between the adjacent sealing ring grooves are triangular.
Further, the distance between the sealing ring groove and the second bearing piece is 0.02mm-0.1 mm.
Further, the liquid metal is any one of gallium indium alloy or metal indium.
In a second aspect, there is provided a vacuum motor comprising a motor housing and at least one liquid metal bearing according to any one of the first aspect, the first bearing member being fixedly connected to the motor housing, the output end of the second bearing member projecting beyond the outer wall of the motor housing; a motor stator is arranged in the motor shell, and a motor rotor matched with the motor stator is fixedly connected to the second bearing part.
Further, the second bearing piece comprises a rotating shaft and bearing end covers, and the bearing end covers are connected with the opposite end faces of the rotating shaft in a sealing mode; the sealing ring groove is arranged in the bearing end cover, and the motor rotor is connected with the rotating shaft.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model discloses a set up the sealed annular that is located bearing clearance port department between first bearing spare and second bearing spare, under centripetal force and the viscosity effect that the bearing operation liquid metal produced, effectively avoided liquid metal to ooze under the internal pressure effect, strengthened the sealing performance between the liquid metal bearing, solved the problem that liquid metal oozes under long-time use or high-speed operation between the liquid metal bearing;
2. the utility model discloses a carry out dynamic design to the ratio of the volume of gallium material and the volume of indium material in the liquid metal, make the minimum temperature that the liquid metal keeps liquid match with the minimum operational environment temperature of liquid metal bearing, both can make the liquid metal automatic solidification when ambient temperature is less than the minimum temperature that the liquid metal keeps liquid, provide the low temperature protect function for the motor, can also cooperate with the seal ring groove after solidifying, have restricted the possibility that the liquid metal oozes, have lengthened the life of bearing in the liquid metal;
3. the liquid metal in the utility model is 10-4The vacuum degree above Pa keeps liquid state, the lubricant does not volatilize under vacuum and lose efficacy like other liquid lubricants, and the lubricant keeps liquid state at the high temperature from room temperature to 500 ℃ and does not volatilize under high temperature and lose efficacy like other liquid lubricants; in addition, the liquid metal is ledThe heat is much better than that of oil, so that the heat dissipation capability of the bearing is improved; when the rotating shaft rotates, the liquid metal completely isolates the friction contact between the rotating shaft and the fixed core shaft, and abrasion is eliminated, so that the service life of the rotating shaft is longer than that of a ball bearing, and the rotating shaft is particularly important for an aerospace equipment system; in addition, the viscosity of the liquid metal is close to that of water, and the viscosity is low, so that the generated flow resistance is small, and the friction of the bearing is small.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a liquid metal bearing according to an embodiment of the present invention;
FIG. 2 is a schematic view of the distribution structure of the seal ring groove in the embodiment of the present invention;
FIG. 3 is a schematic view of another arrangement of the seal ring groove according to the embodiment of the present invention;
fig. 4 is a schematic view of the internal structure of the vacuum motor according to the embodiment of the present invention.
Reference numbers and corresponding part names in the drawings:
101. a first bearing member; 102. a second bearing member; 103. sealing the ring groove; 104. a convex tooth; 105. a rotating shaft; 106. a bearing end cap; 107. a motor housing; 108. a motor stator; 109. a rotor of an electric machine.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and accompanying fig. 1-4, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended to limit the present invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
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 one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
Example 1: a liquid metal bearing comprises a first bearing part 101 and a second bearing part 102 movably sleeved with the first bearing part 101, a bearing gap filled with liquid metal is formed between the first bearing part 101 and the second bearing part 102, a plurality of sealing ring grooves 103 are annularly arranged on the inner wall of the opening end of the second bearing part 102, and the plurality of sealing ring grooves 103 are arranged at intervals along the axial direction of the second bearing part 102.
As shown in fig. 2 and 3, the depth of the seal ring groove 103 gradually increases toward the opening end of the second bearing 102, the depth of the seal ring groove 103 near the bearing gap is smaller than the depth near the opening end of the second bearing 102, the application range of the liquid metal bearing can be improved by setting the gradually changing depth, the exchange flow of the liquid metal in the bearing gap can be effectively reduced, the use stability of the liquid metal bearing is enhanced, more liquid metal leaked from the inside of the bearing can be stored, and the liquid metal can be prevented from continuously leaking outwards.
As shown in fig. 2 and 3, the seal ring groove 103 is a trapezoidal groove or a rectangular groove.
As shown in fig. 1 and 3, the seal ring grooves 103 are rectangular trapezoidal grooves, and the teeth 104 formed between adjacent seal ring grooves 103 are triangular. The volume of the seal ring groove 103 is further increased to prevent leakage of the liquid metal. Since the tooth tips are sharp, even if they contact the second bearing 102, the contact area is very small, and therefore, no seizure occurs. The spacing H1 between the seal ring groove 103 and the second bearing member 102 is typically 0.05mm to 0.1 mm. The narrower this distance H1, the better the seal against the liquid metal, but the greater the difficulty of assembly. Too small a gap H1 may cause jamming and prevent rotation. Therefore, by adopting the triangular design of the convex teeth 104, the distance H1 between the tooth top and the mandrel can be reduced to 0.02mm, so that the sealing effect is further improved. But the structure is the most difficult to manufacture.
In this embodiment, the liquid metal is any one of gallium indium alloy and metal indium.
The amount of gallium species and the amount of indium species in the liquid metal are configured according to the minimum operating ambient temperature of the liquid metal bearing: the ratio of the amount of indium in the liquid metal to the total amount of gallium-indium alloy is 0.13-1; the minimum temperature range at which the liquid metal remains liquid is 16 ℃ to 156 ℃. Here, the total amount of the gallium-indium alloy material refers to the sum of the amount of the gallium material and the amount of the indium material in the liquid metal.
The configuration process of the amount of the gallium substance and the amount of the indium substance in the liquid metal comprises the following specific steps:
T＝441x3-687x2+434x-32
wherein T represents the lowest temperature at which the liquid metal is kept in a liquid state, and the unit is; and x represents the proportion of the indium substance in the gallium-indium alloy to the total substance of the gallium-indium alloy. The parts in the liquid metal were prepared as shown in the following table:
| serial number | Percentage of gallium | Ratio of indium | Minimum temperature of liquid state |
| 1 | 0.87 | 0.13 | 16℃ |
| 2 | 0.75 | 0.25 | 40℃ |
| 3 | 0.5 | 0.5 | 68℃ |
| 4 | 0.25 | 0.75 | 93℃ |
| 5 | 0 | 1 | 156℃ |
The utility model discloses creative through regulation and control liquid metal keep liquid minimum temperature, can provide the low temperature protect function for the motor. When the ambient temperature is lower than the set minimum temperature for keeping the liquid metal in the liquid state, the liquid metal can be automatically solidified, so that the motor is in a locked state. When the ambient temperature is lower than the set temperature, the motor is self-locked, so that the motor and a system connected with the motor can be started only under the set temperature condition.
Example 2: a vacuum motor, as shown in fig. 4, comprising a motor housing 107 and at least one liquid metal bearing according to any one of the first aspect, wherein the first bearing member 101 is fixedly connected to the motor housing 107, and the output end of the second bearing member 102 protrudes from the outer wall of the motor housing 107; a motor stator 108 is provided in the motor housing 107, and a motor rotor 109 fitted to the motor stator 108 is fixedly attached to the second bearing member 102.
The second bearing 102 includes a rotating shaft 105, and a bearing cover 106, wherein the bearing cover 106 is connected with the opposite end face of the rotating shaft 105 in a sealing manner; the sealing ring groove 103 is arranged in the bearing end cover 106, and the motor rotor 109 is connected with the rotating shaft 105.
The working principle is as follows: on one hand, the sealing ring groove 103 positioned at the bearing gap port is arranged between the first bearing part 101 and the second bearing part 102, so that the liquid metal is effectively prevented from seeping under the action of internal pressure under the action of centripetal force and viscosity generated by the running liquid metal of the bearing, the sealing performance between the liquid metal bearings is enhanced, and the problem that the liquid metal among the liquid metal bearings seeps under long-time use or high-speed running is solved; on the other hand, the proportion of the amount of the gallium substance and the amount of the indium substance in the liquid metal is dynamically designed, so that the lowest temperature at which the liquid metal is kept is matched with the lowest working environment temperature of the liquid metal bearing, the liquid metal can be automatically solidified when the environment temperature is lower than the lowest temperature at which the liquid metal is kept, a low-temperature protection function is provided for the motor, the liquid metal can be matched with the sealing ring groove 103 after solidification, the possibility of seepage of the liquid metal is limited, and the service life of the bearing in the liquid metal is prolonged.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The utility model provides a liquid metal bearing, includes first bearing spare (101) and with first bearing spare (101) activity cup joint second bearing spare (102), forms the bearing clearance that supplies liquid metal to fill between first bearing spare (101) and the second bearing spare (102), characterized by, the open end inner wall ring of second bearing spare (102) is equipped with a plurality of seal ring grooves (103), and a plurality of seal ring grooves (103) set up along second bearing spare (102) axis direction interval.
2. A liquid metal bearing according to claim 1, wherein the depth of the sealing ring groove (103) increases gradually towards the open end of the second bearing part (102).
3. A liquid metal bearing according to claim 1, wherein the seal ring groove (103) is a trapezoidal or rectangular groove.
4. The liquid metal bearing of claim 1, wherein the seal ring grooves (103) are rectangular trapezoidal grooves, and the teeth (104) formed between adjacent seal ring grooves (103) are triangular.
5. A liquid metal bearing according to claim 1, wherein the sealing ring groove (103) is spaced from the second bearing member (102) by a distance of 0.02mm to 0.1 mm.
6. The liquid metal bearing of claim 1, wherein said liquid metal is any one of gallium indium alloy or metal indium.
7. A vacuum motor, characterized by comprising a motor housing (107) and at least one liquid metal bearing according to any one of claims 1 to 6, the first bearing member (101) being fixedly connected to the motor housing (107), the output end of the second bearing member (102) projecting beyond the outer wall of the motor housing (107); a motor stator (108) is arranged in the motor shell (107), and a motor rotor (109) matched with the motor stator (108) is fixedly connected to the second bearing piece (102).
8. A vacuum motor according to claim 7, characterized in that the second bearing member (102) comprises a rotary shaft (105), bearing caps (106), the bearing caps (106) being sealingly connected to facing end faces of the rotary shaft (105); the sealing ring groove (103) is arranged in the bearing end cover (106), and the motor rotor (109) is connected with the rotating shaft (105).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121157760.5U CN214698814U (en) | 2021-05-27 | 2021-05-27 | Liquid metal bearing and vacuum motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121157760.5U CN214698814U (en) | 2021-05-27 | 2021-05-27 | Liquid metal bearing and vacuum motor |
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| Publication Number | Publication Date |
|---|---|
| CN214698814U true CN214698814U (en) | 2021-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121157760.5U Active CN214698814U (en) | 2021-05-27 | 2021-05-27 | Liquid metal bearing and vacuum motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153907A (en) * | 2021-05-27 | 2021-07-23 | 中国工程物理研究院机械制造工艺研究所 | Liquid metal bearing and vacuum motor |
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2021
- 2021-05-27 CN CN202121157760.5U patent/CN214698814U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153907A (en) * | 2021-05-27 | 2021-07-23 | 中国工程物理研究院机械制造工艺研究所 | Liquid metal bearing and vacuum motor |
| CN113153907B (en) * | 2021-05-27 | 2024-09-20 | 中国工程物理研究院机械制造工艺研究所 | Liquid metal bearing and vacuum motor |
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