CN211525345U - V-shaped throttling type heavy-load static pressure air bearing - Google Patents
V-shaped throttling type heavy-load static pressure air bearing Download PDFInfo
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- CN211525345U CN211525345U CN201922177040.4U CN201922177040U CN211525345U CN 211525345 U CN211525345 U CN 211525345U CN 201922177040 U CN201922177040 U CN 201922177040U CN 211525345 U CN211525345 U CN 211525345U
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Abstract
The utility model provides a V type throttle formula heavy load static pressure air supporting bearing belongs to the bearing field, including upper end cover and bottom plate, be equipped with the sealing washer between upper end cover and the bottom plate, the bottom plate is close to one side of upper end cover is equipped with the air cavity, the side of bottom plate be equipped with the air supply hole of air cavity intercommunication, the lower extreme of bottom plate be equipped with the orifice of air cavity intercommunication, the vertical setting of orifice, the orifice includes the major diameter hole of upper end and the minor diameter hole of lower extreme, the minor diameter hole is the toper structure that the cross-section gradually reduces. The utility model discloses guarantee that the air current realizes smooth ground vector turn for the inside flow from orifice to the air film of bearing becomes more stable, thereby promotes the stability of bearing.
Description
Technical Field
The utility model belongs to the bearing field relates to air supporting bearing, especially relates to V type throttle formula heavy load static pressure air supporting bearing.
Background
With the rapid development of the aerospace industry in China, the micro-low gravity simulation test of large and ultra-large spacecrafts is a ground test essential for ensuring the performance and reliability of the spacecrafts.
The static pressure air bearing is taken as key equipment in the process of a microgravity ground simulation test of a spacecraft, the performance of the static pressure air bearing directly influences the precision of the ground test, but aiming at the development trend that the load of the large and ultra-large spacecraft is larger and higher and the requirement of the ground test on the bearing capacity of the air bearing is higher and higher, the traditional static pressure air bearing is generally a small-hole throttling type air bearing, the basic principle is that air in the bearing flows out through a throttling hole, so that a layer of air film is formed between the bearing and a lower plane, the bearing is suspended, the bearing capacity is improved by improving the air supply pressure, but along with the improvement of the air supply pressure, the flow speed in the throttling hole of the bearing is increased rapidly, even complicated phenomena such as supersonic flow, shock wave and the like occur, the Bernoulli principle shows that the pressure drop is obvious when the flow speed of the gas is larger, excessive flow velocities can severely affect the pressure within the gas film and thus the macroscopic load-bearing capacity.
The static pressure air bearing has the advantages of no friction, no pollution, high precision, low cost and the like, is widely applied in the fields of aerospace, electronic information, special machining, precision machinery and the like, but has the defects of small bearing capacity, low rigidity and the like of the traditional air bearing, limits the development of the gas bearing, and particularly has higher requirements on rigidity and stability for precision machining and detection equipment, such as precision machine tools, precision measuring instruments and the like.
According to gas dynamics, in the process of expanding and accelerating the gas flow from a high-pressure low-speed region, in a subsonic stage, the gas flow speed is increased along with the reduction of the flow passage area, and after the gas flow reaches the sonic speed at the throat part and enters a supersonic stage, the gas flow speed can be continuously increased along with the increase of the flow passage area. Thus, where supersonic flow is desired, the inner flow passage area is typically designed as a "bell mouth" shape of a convergent-throat-divergent section.
For the bearing, the bearing force F is formed by the pressure integral of an air film and is orthogonal to the direction of flow velocity V, namely the flow velocity is larger, the pressure is smaller, and the bearing force is also smaller.
SUMMERY OF THE UTILITY MODEL
The to-be-solved problem of the utility model is to provide a V type throttle formula heavy load static pressure air supporting bearing, under the high air feed pressure condition, do not have the existence of expansion section runner, guarantee that air velocity can't continue the increase, can realize the effect of deceleration pressure boost well to can realize the obvious promotion of bearing capacity.
In order to solve the technical problem, the utility model discloses a technical scheme is: the V-shaped throttling type heavy-load static pressure air bearing comprises an upper end cover and a lower supporting plate, wherein a sealing ring is arranged between the upper end cover and the lower supporting plate, an air cavity is arranged on one side, close to the upper end cover, of the lower supporting plate, an air supply hole communicated with the air cavity is formed in the side face of the lower supporting plate, a throttling hole communicated with the air cavity is formed in the lower end of the lower supporting plate, the throttling hole is vertically arranged and comprises a large-diameter hole in the upper end and a small-diameter hole in the lower end, and the small-diameter hole is of a conical structure with the section.
Furthermore, the throttle holes are uniformly distributed and arranged in a plurality of numbers relative to the axis of the lower supporting plate, and the throttle holes can be uniformly distributed and arranged in a plurality of circles.
Furthermore, the minimum aperture of the small-diameter hole is 0.03 mm-0.3 mm.
Furthermore, the taper of the small-diameter hole is 60-90 degrees.
Furthermore, the taper of the small-diameter hole is 70-80 degrees.
Further, the large-diameter hole and the small-diameter hole are coaxially arranged, the large-diameter hole and the small-diameter hole are connected through a conical section, and the taper of the conical section ranges from 25 degrees to 35 degrees.
Further, the diameter of the large-diameter hole is 2.8-3.6 times of the maximum diameter of the small-diameter hole, and the length of the large-diameter hole is 4-6 times of the length of the small-diameter hole.
Furthermore, the upper end of the large-diameter hole is provided with a leading-in hole, the leading-in hole and the large-diameter hole are coaxially arranged, the diameter of the leading-in hole is 4-6 times of that of the large-diameter hole, and the depth of the leading-in hole is smaller than that of the large-diameter hole and larger than 85% of that of the large-diameter hole.
Furthermore, a lower flat plate is correspondingly arranged on one side, away from the upper end cover, of the lower supporting plate, and after air flow is discharged through the throttling hole, an air film is formed between the lower flat plate and the lower supporting plate.
Furthermore, the V-shaped throttling type heavy-load static pressure air bearing is a plane thrust bearing, an arc radial bearing or a spherical bearing.
Compared with the prior art, the utility model has the advantages and positive effect as follows.
1. The utility model is suitable for various air bearing such as plane, sphere, the orifice sets up big footpath hole and aperture from top to bottom, and the sectional area reduces gradually, has avoided the sudden expansion and the change of runner, and in the medium outflow process, does not have the existence of expansion section runner, and the air velocity can't continue to increase, and the air current can realize the effect of deceleration pressure boost well to can realize the obvious promotion of bearing capacity;
2. the utility model can be applied to the equipment which has high rigidity and high stability requirement for the air bearing, such as aerospace micro-low gravity simulation, ultra-high precision testing rotary table, microelectronic equipment, high precision machine tool, etc., and has good social effect and economic value;
3. the minimum aperture of the small-diameter hole is 0.03 mm-0.3 mm; preferably 0.15-0.2 mm; more preferably, the tapering of path hole is 60 ~ 90 degrees, because the diameter of path hole is very little, calculates with the micron, tapering and aperture will match, and the minimum diameter of path hole is less, and then its tapering is big more, for convenient processing manufacturing, can adopt great drill bit to process big footpath hole earlier usually, processes the path hole at last, sets up above reasonable proportion parameter for the orifice is more convenient to be made, and reduce cost guarantees the stability of air current moreover.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
FIG. 1 is a schematic structural view of a V-shaped throttling type heavy-load static pressure air bearing of the present invention;
FIG. 2 is a cross-sectional view of the orifice of the present invention;
fig. 3 is an enlarged view of the small-diameter hole of the present invention.
Reference numerals:
1. an upper end cover; 2. a lower supporting plate; 21. an air cavity; 3. an air supply hole; 4. an orifice; 41. a large-diameter hole; 42. a small-diameter hole; 43. a conical section; 44. an introduction hole; 5. a seal ring; 6. a lower flat plate; 7. and (5) air film.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. 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," "second," etc. 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 otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.
As shown in fig. 1 to 3, the V-shaped throttling type heavy-duty static pressure air bearing comprises an upper end cover 1 and a lower supporting plate 2, a sealing ring 5 is arranged between the upper end cover 1 and the lower supporting plate 2, an air cavity 21 is arranged on one side of the lower supporting plate 2 close to the upper end cover 1, an air supply hole 3 communicated with the air cavity 21 is arranged on the side surface of the lower supporting plate 2, a throttling hole 4 communicated with the air cavity 21 is arranged at the lower end of the lower supporting plate 2, the throttling hole 4 is vertically arranged, the throttling hole 4 comprises a large-diameter hole 41 at the upper end and a small-diameter hole 42 at the lower end, and the small.
Preferably, the orifice 4 is set up to a plurality ofly for the axis equipartition of bottom plate 2, and orifice 4 equipartition can be for many rings setting, according to bearing the needs, designs orifice 4 quantity and overall arrangement, can satisfy the in-service use demand, if the bearing capacity demand is great, then need set up more orifice 4, guarantees more gas outflow, promotes the bearing capacity, if the bearing capacity is less, then set up less orifice 4 can, the arrangement of orifice 4 need not symmetry or other special settlement requirements.
Preferably, the minimum aperture of the small-diameter hole 42 is 0.03mm to 0.3 mm; preferably 0.15-0.2 mm; more preferably, the taper of the small-diameter hole 42 is 60 to 90 degrees, because the diameter of the small-diameter hole 42 is very small, calculated in microns, the taper and the aperture are matched, the smaller the minimum diameter of the small-diameter hole 42 is, the larger the taper is, for the convenience of processing and manufacturing, the larger drill bit is usually adopted to process the large-diameter hole 41 first, and the small-diameter hole 42 is processed last, and the reasonable proportion parameters are set, so that the throttling hole 4 is more convenient to manufacture, the cost is reduced, and the stability of the airflow is ensured.
Preferably, the taper of the small-diameter hole 42 is 70-80 degrees, and in the taper range, in the medium flowing process, no expansion section flow channel exists, the air flow speed cannot be increased continuously, the air flow can well achieve the speed reduction and pressurization effects, and therefore the bearing capacity of the bearing can be improved obviously.
Preferably, big footpath hole 41 and the coaxial setting of path hole 42, big footpath hole 41 and path hole 42 pass through circular cone section 43 and connect, the tapering of circular cone section 43 is 25 ~ 35 degrees, set up certain transition, more be favorable to transition and processing between big footpath hole 41 and the path hole 42, the tapering of circular cone section 43 is too big, lead to path hole 42 structural configuration to be unfavorable for the setting, the tapering of circular cone section 43 is too little, the transition is gentle inadequately, be unfavorable for the air current stable.
Preferably, the diameter of the large-diameter hole 41 is 2.8 to 3.6 times of the maximum diameter of the small-diameter hole 42, and the length of the large-diameter hole 41 is 4 to 6 times of the length of the small-diameter hole 42; more preferably, the upper end of the large-diameter hole 41 is provided with the leading-in hole 44, the leading-in hole 44 and the large-diameter hole 41 are coaxially arranged, the diameter of the leading-in hole 44 is 4-6 times of the diameter of the large-diameter hole 41, the depth of the leading-in hole 44 is smaller than the depth of the large-diameter hole 41 and larger than 85% of the depth of the large-diameter hole 41, the above arranged parameters better guarantee the process that the flow channel is gradually reduced, avoid sudden expansion and change of the flow channel, better guarantee the stability of the air flow velocity, further guarantee the speed reduction and increase effect, and improve the bearing capacity.
Preferably, a lower flat plate 6 is correspondingly arranged on one side, away from the upper end cover 1, of the lower supporting plate 2, after the air flow is discharged through the throttle hole 4, an air film 7 is formed between the lower flat plate 6 and the lower supporting plate 2, and the existence of the air film 7 is an air flotation layer, so that an air flotation principle is realized.
Preferably, the V-shaped throttling heavy-load static pressure air bearing is a plane thrust bearing, an arc radial bearing or a spherical bearing, and the application range is wide.
In the process of actual use, the air supply hole 3 is connected with an external air supply device, which can be nitrogen or common air, the setting is carried out according to the actual situation, the air cavity 21 is supplied with air through the air supply hole 3, then the air is sprayed out through the throttle hole 4, an air film 7 is formed between the lower support plate 2 and the lower flat plate 6, namely, an air floating layer, because the throttle hole 4 is sequentially provided with a lead-in hole 44, a large-diameter hole 41 and a small-diameter hole 42 from top to bottom, the sectional area is gradually reduced, the sudden expansion and change of a flow channel are avoided, in the medium flowing-out process, the flow channel is not provided with an expansion section, the air speed cannot be continuously increased, the air flow can well realize the effect of reducing speed and pressurizing, and the obvious improvement of the.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.
Claims (10)
- V type throttle formula heavy load static pressure air bearing, its characterized in that: the upper end cover and the lower supporting plate are arranged, a sealing ring is arranged between the upper end cover and the lower supporting plate, an air cavity is arranged on one side, close to the upper end cover, of the lower supporting plate, an air supply hole communicated with the air cavity is formed in the side face of the lower supporting plate, a throttling hole communicated with the air cavity is formed in the lower end of the lower supporting plate, the throttling hole is vertically arranged and comprises a large-diameter hole in the upper end and a small-diameter hole in the lower end, and the small-diameter hole is of a conical structure with the gradually reduced cross section.
- 2. The V-type throttling heavy-duty hydrostatic air bearing of claim 1, wherein: the orifices are uniformly distributed and arranged in a plurality of circles relative to the axis of the lower supporting plate.
- 3. The V-type throttling heavy-duty hydrostatic air bearing of claim 1, wherein: the minimum aperture of the small-diameter hole is 0.03 mm-0.3 mm.
- 4. The V-type throttling heavy-duty hydrostatic air bearing of claim 1, wherein: the taper of the small-diameter hole is 60-90 degrees.
- 5. The V-type throttling heavy-duty hydrostatic air bearing of claim 1, wherein: the taper of the small-diameter hole is 70-80 degrees.
- 6. The V-type throttling heavy-duty hydrostatic air bearing of claim 1, wherein: the large-diameter hole and the small-diameter hole are coaxially arranged and are connected through a conical section, and the conical degree of the conical section ranges from 25 degrees to 35 degrees.
- 7. The V-type throttling heavy-duty hydrostatic air bearing according to any one of claims 1 to 6, characterized in that: the diameter of the large-diameter hole is 2.8-3.6 times of the maximum diameter of the small-diameter hole, and the length of the large-diameter hole is 4-6 times of the length of the small-diameter hole.
- 8. The V-type throttling heavy-duty hydrostatic air bearing according to any one of claims 1 to 6, characterized in that: the upper end of the large-diameter hole is provided with a leading-in hole, the leading-in hole and the large-diameter hole are coaxially arranged, the diameter of the leading-in hole is 4-6 times of that of the large-diameter hole, and the depth of the leading-in hole is smaller than that of the large-diameter hole and larger than 85% of that of the large-diameter hole.
- 9. The V-type throttling heavy-duty hydrostatic air bearing of claim 1, wherein: and one side of the lower supporting plate, which is far away from the upper end cover, is correspondingly provided with a lower flat plate, and after air flow is discharged through the throttling hole, an air film is formed between the lower flat plate and the lower supporting plate.
- 10. The V-type throttling heavy-duty hydrostatic air bearing of claim 1, wherein: the V-shaped throttling type heavy-load static pressure air bearing is a plane thrust bearing, an arc radial bearing or a spherical bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922177040.4U CN211525345U (en) | 2019-12-06 | 2019-12-06 | V-shaped throttling type heavy-load static pressure air bearing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922177040.4U CN211525345U (en) | 2019-12-06 | 2019-12-06 | V-shaped throttling type heavy-load static pressure air bearing |
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| CN211525345U true CN211525345U (en) | 2020-09-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110939655A (en) * | 2019-12-06 | 2020-03-31 | 天津航天机电设备研究所 | V-shaped throttling type heavy-load static pressure air bearing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110939655A (en) * | 2019-12-06 | 2020-03-31 | 天津航天机电设备研究所 | V-shaped throttling type heavy-load static pressure air bearing |
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