CN211874947U - A high-speed helical groove small hole node hydrostatic gas bearing device - Google Patents

Abstract

The utility model belongs to the technical field of gas bearings, and in particular relates to a high-speed helical groove and small hole knot flow static pressure gas bearing device. The gas bearing is a hollow cylinder, the outer side wall of the hollow cylinder is evenly distributed with double rows of air supply holes along the circumferential direction, and each air supply hole is coaxially matched with the small hole restrictor. The inner side wall of the hollow cylinder is machined with rectangular axial micro-through grooves along the circumferential direction to connect the double-row small hole restrictors, and at the same time, a plurality of sets of spiral grooves are processed symmetrically distributed on both sides of the axial micro-through grooves. The utility model combines the advantages of two types of gas bearings, static pressure and dynamic pressure. In the starting and stopping stages of the bearing, the external high-pressure gas is firstly transported to the small hole restrictor through the gas supply hole to form a static pressure effect and increase the rigidity of the gas film. Improve the stability, stop the continuous high-pressure air supply from the outside during high-speed rotation, and use the rotation of the journal to press the air into the spiral groove to generate the dynamic pressure effect of the fluid, improve the bearing capacity, and achieve the purpose of enhancing the overall performance of the bearing.

Description

A high-speed helical groove small hole node hydrostatic gas bearing device

Technical field:

The utility model belongs to the technical field of gas bearings, and in particular relates to a high-speed helical groove and small hole knot flow static pressure gas bearing device.

Background technique:

With the rapid development of various emerging technology industries, bearings, as a key component of machinery, restrict the development of other technologies, so various industries have put forward more stringent conditions for their mechanical parts. Traditional bearings are more and more difficult to meet the high requirements of machinery for their performance, while gas bearings benefit from their advantages of high precision, low frictional energy consumption, long service life, strong adaptability to various environments, cleanliness and environmental protection, etc., in modern machinery. more and more widely used. However, because the working medium is gas, the gas bearing has the problems of insufficient load bearing and insufficient anti-interference ability to vibration caused by the small surface stiffness of the gas film. Therefore, improving the bearing capacity of the gas bearing and the rigidity of the gas film surface has profound significance for the further application of the gas bearing in the field of modern machinery, so a high-load, high-rigidity dynamic and static pressure gas bearing device is required.

Utility model content:

The purpose of this utility model is to aim at the above-mentioned deficiencies of the prior art, to provide a high-speed helical groove small-hole joint fluid static pressure gas bearing device, which can meet the requirements of improving the bearing capacity of the gas bearing and the surface rigidity of the gas film, thereby achieving enhanced gas The purpose of the overall performance of the bearing.

The utility model adopts the following technical solutions:

The utility model relates to a high-speed helical groove small hole choke flow static pressure gas bearing, which is machined with an air supply hole, a small hole restrictor, a spiral groove and an axial micro-through groove.

A plurality of rectangular axial micro-through grooves are formed in the middle section of the inner side wall of the high-speed helical groove small hole node hydrostatic gas bearing, and a plurality of sets of symmetrical spiral grooves are also formed on both sides of the axial micro-through groove along the circumferential direction. The outer side wall of the high-speed helical groove small-hole block flow static pressure gas bearing is provided with a plurality of groups of double-row air supply holes along the circumferential direction, and a small-hole restrictor is arranged at the bottom of each air supply hole, and the double-row air supply holes are connected by the small-hole restrictor. In communication with the axial micro-through groove, the air supply hole is coaxially corresponding to the small hole restrictor.

The technical scheme adopted by the utility model has the following beneficial effects: the utility model combines the advantages of the two types of gas bearings of static pressure and dynamic pressure, and can meet the requirements that the bearing can first transport the external high-pressure gas through the air supply hole to the small hole during the starting and stopping stages. In the restrictor, a static pressure effect is formed to avoid dry friction, increase the surface rigidity of the air film, and improve the stability. It can also meet the requirements of stopping the continuous high-pressure air supply from the outside when the bearing rotates at high speed, and uses the rotation of the journal to reduce the air pressure. The dynamic pressure effect of the fluid is generated by entering the spiral groove, which improves the bearing capacity and achieves the purpose of enhancing the overall performance of the bearing.

Description of drawings:

Fig. 1 is the perspective view of the present utility model;

Fig. 2 is the left side view of the present utility model;

Fig. 3 is the A-A sectional view of Fig. 2 and a partial enlarged view;

Fig. 4 is the top view of the present utility model;

Fig. 5 is the B-B sectional view of Fig. 4 and partial enlarged view;

FIG. 6 is a C-C sectional view and a partial enlarged view of FIG. 4 .

In the figure: 1 air supply hole; 2 small hole restrictor; 3 spiral groove; 4 axial micro-through groove.

Detailed ways:

The following will further clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention.

Referring to FIGS. 1 to 6 , this embodiment discloses a high-speed helical groove small-hole block flow hydrostatic gas bearing, which is machined with air supply holes, small-hole restrictors, spiral grooves and axial micro-through grooves. The high-speed helical groove small hole section flow static pressure gas bearing is a hollow cylinder, and the outer side wall of the hollow cylinder is provided with a plurality of air supply holes 1 along the circumferential direction. The orifice restrictor 2 communicates. The air supply hole 1 is coaxially corresponding to the small hole restrictor 2 . The middle section of the inner side wall of the hollow cylinder is provided with a plurality of rectangular axial micro-through grooves 4 along the circumferential direction, the bottom of the small hole restrictor 2 is communicated with the axial micro-through groove 4, and the corresponding air supply holes are communicated through the small hole restrictor 2 1 and the axial micro-through slot 4. The inner side wall of the hollow cylinder is also provided with a plurality of helical grooves 3 along the circumferential direction. In this embodiment, the symmetrical helical grooves 3 are distributed on both sides of the axial micro-through groove 4 respectively.

Specifically, the present embodiment will be described with reference to FIG. 3 and FIG. 4. The outer diameter of the high-speed helical groove small-hole joint hydrostatic gas bearing is D, D is generally 80-100 mm, and the width is L, and L is generally 60 mm. ~80mm, and others are the same as in the first embodiment.

Specifically, the present embodiment is described with reference to FIG. 3 , the width of the helical groove 3 is b _g , which directly affects the static performance of the bearing, and b _g is generally _1-3 mm; the helix angle of the helical groove 3 is β, The angle of β is 40°～50°; the air supply hole 1 is a double row air supply hole, the diameter of the air supply hole 1 is d ₁ , and d ₁ is generally 2 to 4 mm; the diameter of the small hole restrictor 2 is d _2. In order to facilitate processing and the small holes are not easily blocked during the working process of the bearing, d ₂ is generally 0.2 to 0.4 mm; the depth of the axial micro-through groove 4 is h, which will have a great impact on the bearing performance, and the depth h is generally . 0.16-0.18mm, and the axial micro-through groove 4 communicates the double-row small hole restrictors 2, and the other is the same as the specific embodiment 1.

Specifically, the present embodiment is described with reference to FIG. 5 . The width of the axial micro-through groove 4 is b, and the bearing capacity of the bearing and the surface stiffness of the air film show an increasing trend with the increase of the width b, but when the width b increases to After a certain degree, the effect of improving the bearing capacity and the surface stiffness of the air film is not obvious, and the width b is generally 0.6 to 0.8 mm. And there are 8 axial micro-through grooves 4 evenly distributed along the circumferential direction, and the air supply holes 1 and the small hole restrictor 2 are evenly distributed with 8 groups along the circumferential direction, which ensures the uniformity of high-pressure gas supply. It is the same as the specific embodiment 1.

Specifically, the present embodiment is described with reference to FIG. 6 . The depth of the spiral groove 3 is h _g , and the change of h _g will cause the change of the thickness of the gas film to affect the bearing capacity. The bearing capacity increases with the decrease of the depth. The depth h _g is generally 0.1 to 0.3 mm. In addition, there are 24 groups of the spiral grooves 3 symmetrically distributed along the circumferential direction, and the others are the same as the first embodiment.

working principle

When the utility model works, the external high-pressure gas is transported into the small-hole restrictor through a plurality of air supply holes, and the pressure drop is generated through the throttling action of the small-hole restrictor to form a static pressure bearing, and the external high-pressure gas supply is stopped under high-speed operation. , using the rotation of the journal to press the air into the spiral groove to form the dynamic pressure effect of the fluid, thereby achieving the characteristics of the utility model.

Claims (6)

1. A high-speed helical groove small hole section hydrostatic gas bearing, characterized in that: the hydrostatic gas bearing is a hollow cylinder, and the outer side wall of the hollow cylinder is evenly distributed with double-row air supply holes (1) along the circumferential direction, And each air supply hole (1) is matched with a small hole restrictor (2), the air supply hole (1) is coaxially corresponding to the small hole restrictor (2), and the inner side wall of the hollow cylinder is processed along the middle of the circumferential direction. There are rectangular axial micro-through grooves (4) to communicate the double-row orifice restrictors (2), and a plurality of sets of helical grooves (3) are formed on the inner side wall of the hollow cylinder, and the helical grooves (3) are symmetrically distributed in Both sides of the axial micro-through groove (4). 2 . A high-speed helical groove small hole node hydrostatic gas bearing according to claim 1 , wherein the helical groove (3) is uniformly distributed in 24 groups along the circumferential direction, and the groove depth h _g is 0.1～ 0.3 mm, the groove width b _g is 1 to 3 mm, and the angle of the helix angle β is 40° to 50°. 3. A kind of high-speed helical groove small hole joint flow static pressure gas bearing according to claim 1, characterized in that: the air supply holes (1) are double-row air supply holes, and there are 8 groups of air supply holes evenly distributed along the circumference. (1) is a circular hole with a diameter d ₁ of 2 to 4 mm. 4. A kind of high-speed helical groove small hole node hydrostatic gas bearing according to claim 1, characterized in that: the outer diameter of the hollow cylinder is D, D is generally 80-100mm, and the width is L, L Generally 60 ~ 80mm. 5. A kind of high-speed helical groove small hole joint flow static pressure gas bearing according to claim 1, characterized in that: the small hole restrictor (2) is evenly distributed with 8 groups along the circumference, and the diameter of the small hole is d. ₂ is 0.2 to 0.4 mm. 6. A kind of high-speed helical groove small hole node hydrostatic gas bearing according to claim 1, characterized in that: the axial micro-through grooves (4) are rectangular, and there are 8 evenly distributed along the circumference, and the groove width b is 0.6 to 0.8 mm, and the groove depth h is 0.16 to 0.18 mm.

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