A gas floating ball bearing structure capable of moving gas

Abstract

The application provides a movable gas supply air floating ball bearing structure, the upper end of the bearing convex ball is fixedly connected to a device to be measured or a simulated motion part of a space vehicle, the lower end of the bearing concave ball is fixedly connected to a fixed position, the bearing concave ball is provided with a first gas path, the bearing convex ball is provided with a second gas path, the gas inlet end of the first gas path is communicated with an external gas injection device, and the gas outlet end of the first gas path is communicated with the gas inlet end of the second gas path. The movable gas supply air floating ball bearing structure avoids the problems of a general high-pressure gas cylinder, large volume, change of gas consumption mass characteristics, high simulation cost and poor effect, and improves test precision and efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of air floating bearing, in particular to a kind of air floating ball bearing structure of movable gas transmission. BACKGROUND

[0002] Gas bearing, sliding bearing with gas as lubricant. The most commonly used gas lubricant is air, and nitrogen, argon, hydrogen, helium or carbon dioxide can also be used as needed. In gas compressor, expander and circulator, the working medium is often used as lubricant, and one of the key components of ground simulation of space vehicle is air floating ball bearing. When in use, the concave ball is generally the fixed part, and the convex ball is the moving part. The upper edge of the convex ball is generally equipped with a moving simulation component. A pressure gas source is often needed for nozzle thrust simulation. Space simulation cannot have various disturbances, so it is not feasible to use a lifting pipe to supply gas when the convex ball moves. Generally, a high-pressure gas cylinder is configured. The high-pressure gas cylinder is large in size, and the mass characteristics change with gas consumption. The simulation cost is high, and the effect is poor. SUMMARY

[0003] Therefore, the present application aims to provide an air floating ball bearing structure with movable gas transmission to solve the problems of large size of high-pressure gas cylinder, change of mass characteristics with gas consumption, high simulation cost and poor effect in space nozzle thrust simulation of the prior art.

[0004] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0005] An air floating ball bearing structure with movable gas transmission includes a bearing convex ball and a bearing concave ball arranged below the bearing convex ball. The lower end of the bearing convex ball can roll on the upper end of the bearing concave ball. The upper end of the bearing concave ball is provided with a groove. The lower end of the bearing convex ball is an arc-shaped structure, which is located in the groove. The upper end of the bearing convex ball is fixedly connected to a device to be tested. The lower end of the bearing concave ball is fixedly connected to a fixed position. The bearing concave ball is provided with a first gas path. The bearing convex ball is provided with a second gas path. The gas inlet end of the first gas path is connected to an external gas injection device. The gas outlet end of the first gas path is connected to the gas inlet end of the second gas path. The gas outlet end of the second gas path is connected to the device to be tested.

[0006] Further, the upper end of the bearing convex ball is provided with a blind groove, and a gas connection disc is installed in the blind groove. The gas outlet end of the second gas path is connected to the gas inlet end of the gas connection disc, and a plurality of first gas connection nozzles are installed on the gas connection disc.

[0007] Further, the first gas path includes a first gas inlet path and a first gas distribution path. The bearing concave ball is provided with a first gas inlet path, and the first gas distribution path is an annular groove arranged along the bottom of the groove. The first gas distribution path is connected to the external gas injection device through the first gas inlet path.

[0008] Further, the second gas path comprises a second gas inlet path and a second gas distribution path, the second gas inlet path is arranged on the bearing convex ball, and the second gas distribution path is an annular groove arranged along the bottom of the arc structure.

[0009] Further, the inner diameter of the second gas distribution path is the same as the inner diameter of the first gas distribution path.

[0010] Further, the first gas distribution path is multiple, and the multiple first gas distribution paths are arranged from inside to outside along the axis of the bearing concave ball, and the inner diameter difference between adjacent two first gas distribution paths is not greater than the inner diameter of the second gas distribution path.

[0011] Further, the distance between the outermost first gas distribution path and the inner edge of the groove is greater than the inner diameter of the second gas distribution path.

[0012] Compared with the prior art, the movable gas conveying air floating ball bearing structure has the following beneficial effects: the first gas path and the second gas path are connected in series, and then the gas is distributed to the space simulation aircraft by the gas receiving disc, so that the gas is conveyed from the static gas conveying bearing concave ball to the movable gas conveying bearing convex ball and the space aircraft, the gas conveying process is realized without additional disturbance and friction, and the inherent ultra-low friction of the air floating ball bearing is not reduced, the problems of large volume, change of gas consumption mass characteristics, high simulation cost and poor effect of the existing high-pressure gas cylinder are avoided, and the test precision and efficiency are improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] The drawings constituting a part of the present application are used to provide further understanding of the present application, the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0014] Figure 1 The structure schematic view of the movable gas conveying air floating ball bearing structure according to the embodiment of the present application;

[0015] Figure 2 The cross-sectional schematic view of the movable gas conveying air floating ball bearing structure according to the embodiment of the present application;

[0016] Figure 3 The exploded structure schematic view of the movable gas conveying air floating ball bearing structure according to the embodiment of the present application;

[0017] Figure 4 The lower view schematic view of the bearing convex ball according to the embodiment of the present application;

[0018] Figure 5 The upper view schematic view of the bearing concave ball according to the embodiment of the present application;

[0019] Figure 6 A cross-sectional view of the maximum turning angle of the bearing convex ball according to an embodiment of the present application is shown in FIG. 1.

[0020] Explanation of reference numerals:

[0021] 1 - bearing convex ball; 11 - second sub-gas passage; 2 - bearing concave ball; 21 - first sub-gas passage; 3 - gas receiving disc. DETAILED DESCRIPTION

[0022] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0023] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0024] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0025] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0026] As Figures 1-6As shown, a movable air-bearing ball bearing structure includes a bearing convex ball 1 and a bearing concave ball 2 disposed below it. The lower end of the bearing convex ball 1 can roll without friction on the upper end of the bearing concave ball 2 via air buoyancy. The structure and principle of the air-bearing ball 1 and the bearing concave ball 2 rolling without friction are existing technologies. The upper end of the bearing concave ball 2 is provided with a groove, and the lower end of the bearing convex ball 1 has an arc-shaped structure located within the groove. The upper end of the bearing convex ball 1 is fixedly connected to the device under test, and the lower end of the bearing concave ball 2 is fixedly connected to a fixed position. The bearing concave ball 2 is provided with a first air passage, and the bearing convex ball 1 is provided with a second air passage. The air inlet end of the first air passage is connected to an external injection device. The gas equipment has a first gas path outlet connected to a second gas path inlet, and a second gas path outlet connected to the device under test. The upper end of the bearing convex ball 1 is provided with a blind groove, and a gas receiving plate 3 is installed in the blind groove. The outlet of the second gas path is connected to the inlet of the gas receiving plate 3, and several first gas nozzles are installed on the gas receiving plate 3. The first and second gas paths are connected in series, and then the gas receiving plate 3 branches the gas to the spacer. This realizes the transfer of gas from the stationary gas-carrying bearing concave ball 2 to the moving gas-carrying bearing convex ball 1 and the spacer. This avoids the problems of large volume of practical high-pressure gas cylinders, changes in mass characteristics with gas consumption, high simulation cost, and poor effect, thus improving the testing accuracy and efficiency.

[0027] like Figure 2 As shown, the first air path includes a first air inlet and a first air distribution path 21. The bearing concave ball 2 is provided with a first air inlet, and the first air distribution path 21 is an annular groove provided along the bottom of the concave groove. The first air distribution path 21 is connected to an external air injection device through the first air inlet, and the external air injection device is an air pump. The second air path includes a second air inlet and a second air distribution path 11. The bearing convex ball 1 is provided with a second air inlet, and the second air distribution path 11 is an annular groove provided along the bottom of the arc-shaped structure. The second air distribution path 11 is connected to the air receiving plate 3 through the second air inlet, and the second air distribution path 11 is connected to the first air distribution path 21. The inner diameter A of the second air distribution path 11 is the same as the inner diameter D of the first air distribution path 21.

[0028] To improve the multi-degree-of-freedom rotation radius of the bearing cam 1, the first air distribution path 21 needs to be divided into multiple paths, such as... Figure 2 and Figure 5 As shown, multiple first air distribution channels 21 are arranged sequentially from the inside to the outside along the axis of the bearing concave ball 2, and the difference B between the inner diameters of two adjacent first air distribution channels 21 is not greater than the inner diameter A of the second air distribution channel 11.

[0029] Meanwhile, in order to ensure that the first air distribution path 21 and the second air distribution path 11 always remain in a state of ventilation, such as Figure 2 As shown, the distance C of the first air distribution path 21 located on the outermost layer from the inner edge of the groove is greater than the inner diameter A of the second air distribution path 11, and when the second air distribution path 11 is connected to the air passage through the first air distribution path 21 on the outermost layer, as... Figure 6The maximum rotation angle of the bearing convex ball 1 is shown, which can be limited by an external baffle.

[0030] The above description is merely preferred embodiments of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A movable air-bearing ball bearing structure, comprising a bearing convex ball (1) and a bearing concave ball (2) disposed below it, wherein the lower end of the bearing convex ball (1) is capable of rolling on the upper end of the bearing concave ball (2), the upper end of the bearing concave ball (2) is provided with a groove, the lower end of the bearing convex ball (1) is an arc-shaped structure, the arc-shaped structure being located within the groove, the upper end of the bearing convex ball (1) is fixedly connected to the device under test, and the lower end of the bearing concave ball (2) is fixedly connected to a fixed position, characterized in that: The bearing concave ball (2) is provided with a first air passage, and the bearing convex ball (1) is provided with a second air passage. The air inlet of the first air passage is connected to an external air injection device, the air outlet of the first air passage is connected to the air inlet of the second air passage, and the air outlet of the second air passage is connected to the device to be tested. The upper end of the bearing ball (1) is provided with a blind groove, and the air receiving plate (3) is installed in the blind groove; The first air passage includes a first air inlet passage and a first air distribution passage (21). The bearing concave ball (2) is provided with a first air inlet passage, and the first air distribution passage (21) is an annular groove provided along the bottom of the groove. The first air distribution passage (21) is connected to an external air injection device through the first air inlet passage. The second air passage includes a second air inlet passage and a second air distribution passage (11). The bearing convex ball (1) is provided with a second air inlet passage, and the second air distribution passage (11) is an annular groove provided along the bottom of the arc structure. The second air distribution passage (11) is connected to the air receiving plate (3) through the second air inlet passage, and the second air distribution passage (11) is connected to the first air distribution passage (21). There are multiple first air distribution channels (21), and the multiple first air distribution channels (21) are arranged from the inside to the outside along the axis of the bearing concave ball (2). The difference in the inner diameter of two adjacent first air distribution channels (21) is not greater than the inner diameter of the second air distribution channel (11). The distance between the first air distribution path (21) located on the outermost layer and the inner edge of the groove is greater than the inner diameter of the second air distribution path (11); When the second air distribution path (11) is connected to the air distribution path through the outermost first air distribution path (21), it is the maximum rotation angle of the bearing convex ball (1).

2. The movable air-bearing ball bearing structure according to claim 1, characterized in that: The outlet of the second air passage is connected to the inlet of the air receiving plate (3), and several first air nozzles are installed on the air receiving plate (3).

3. The movable air-bearing ball bearing structure according to claim 1, characterized in that: The inner diameter of the second gas distribution channel (11) is the same as the inner diameter of the innermost first gas distribution channel (21).

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