CN114508547A - Static pressure gas radial bearing with adjustable throttling hole parameters and centrifugal fan - Google Patents

Abstract

The invention discloses a static pressure gas radial bearing with adjustable orifice parameters and a centrifugal fan, and relates to the field of high-speed rotating machinery. An air supply hole is opened on the outer cylindrical surface of the bearing, and a threaded hole is opened below the air supply hole; the upper end of the threaded hole is connected with the air supply hole, and the lower end of the threaded hole is located on the working surface of the bearing; the threaded hole is provided with a screw, and the screw is provided with a screw. Orifice, the screw is divided into various specifications according to the diameter of the orifice. The static pressure gas radial bearing provided by the invention has a simple structure and is convenient to manufacture. By replacing different screws, the throttling effect of the throttle hole and the bearing clearance can be changed, thereby adjusting the rigidity and bearing capacity of the static pressure gas radial bearing; It is easy to disassemble and assemble, and it is convenient to adjust the orifice parameters according to the actual needs, so that the same bearing can be used under different working fluids and different load conditions, which broadens the application scope of the bearing.

Description

A static pressure gas radial bearing with adjustable orifice parameters and a centrifugal fan

technical field

The invention relates to the technical field of high-speed rotating machinery, in particular to a static pressure gas radial bearing with adjustable orifice parameters and a centrifugal fan.

Background technique

The static pressure gas radial bearing uses the working gas as a lubricant, which has the advantages of no oil, low friction loss, long working life and high motion accuracy. and other technical fields have been widely used. Bearing stiffness is the main performance index of hydrostatic gas radial bearings, and it is also the key to ensure bearing accuracy and accuracy retention. Small hole throttling static pressure gas radial bearing adopts a small diameter orifice and a small bearing clearance, so that the gas has a strong throttling effect in the process of passing the orifice and the bearing clearance, so as to ensure that the bearing obtains higher stiffness.

At present, traditional static pressure gas radial bearings mostly use the method of directly drilling holes on the outer cylindrical surface of the bearing to set orifices. This drilling method is not only difficult to operate, but also the drill bit is easy to break during drilling; in addition, the rotor and the The center of the bearing will be eccentric due to the action of the load. In order to reduce the difficulty of processing, the orifice with the same diameter opened by direct drilling cannot achieve the best bearing stiffness; when the load changes or the lubricating medium changes, the bearing needs to be re-processed. The design and manufacture increase the cost and limit the application scope of the static pressure gas radial bearing with the same main shaft diameter.

SUMMARY OF THE INVENTION

In order to overcome the above shortcomings of the prior art, one aspect of the present invention provides a static pressure gas radial bearing with adjustable orifice parameters, which can optimize the bearing capacity under different loads and lubricating medium conditions, and has Good processing and assembly properties.

In order to achieve the above object, the present invention adopts the following technical solutions to be realized:

A static pressure gas radial bearing with adjustable orifice parameters, the outer cylindrical surface of the bearing is provided with an air supply hole, and a threaded hole is formed below the air supply hole; the orifice at the upper end of the threaded hole is connected with the air supply hole, and the lower end is located at the working position of the bearing. A screw is arranged in the threaded hole, and a throttle hole is opened on the screw.

The screw is provided with an orifice which is coaxial with the external thread on the screw, and the diameter of the orifice is 0.1-0.8mm.

The threaded holes are distributed in one row, two rows or four rows along the axial direction of the bearing, each row of threaded holes is evenly distributed along the circumferential direction of the bearing seat, and the number of each row is 4-24.

The apertures of the orifices in the same row of screws may be the same, or screws with different apertures may be used for arrangement and arrangement according to requirements.

The screw includes one or more of a hexagonal socket set screw, a flat socket set screw, and a cross recess set screw, and the screw and the threaded hole are sealed with thread tightening glue or raw tape.

The air supply hole is coaxial with the threaded hole, and the diameter of the air supply hole is greater than or equal to the diameter of the threaded hole.

Change the depth of the pressure equalizing groove and whether to set the pressure equalizing groove by changing the depth of the screw into the threaded hole.

Another aspect of the present invention also provides a centrifugal fan, comprising: an impeller, a bearing cover, a rotor, the rotor passing through the bearing cover, and a static pressure gas with adjustable orifice parameters provided by the present invention The radial bearing is connected to the impeller at one end, and the static pressure gas radial bearing with adjustable orifice parameters is mounted on the bearing cover plate.

Compared with the prior art, the present invention has the following beneficial technical effects:

The static pressure gas radial bearing with adjustable orifice parameters provided by the invention has a simple structure and is convenient to manufacture. The throttling effect can improve the rigidity and bearing capacity of the static pressure gas radial bearing; when the static pressure gas radial bearing is used in a centrifugal fan, since the screws are easy to disassemble and assemble, it is convenient to adjust the orifice diameter and load distribution according to the load distribution. The arrangement allows the same bearing to be used under different working fluids and under different load conditions, which broadens the application scope of the bearing.

Description of drawings

FIG. 1 is a transverse cross-sectional view (1) of the bearing of the present invention.

FIG. 2 is a schematic structural diagram (1) of the bearing of the present invention.

FIG. 3 is a schematic structural diagram of the screw of the present invention.

4 is a cross-sectional view of the screw of the present invention.

FIG. 5 is a schematic structural diagram (2) of the bearing of the present invention.

FIG. 6 is a transverse cross-sectional view (2) of the bearing of the present invention.

Fig. 7 is a longitudinal sectional view of the bearing of the present invention.

8 is a schematic diagram of the application of the static pressure gas radial bearing provided in an embodiment of the present invention to a centrifugal fan;

In the figure, 1 is an air supply hole, 2 is a threaded hole, 3 is a screw, 4 is an orifice, 5 is an impeller, 6 is a bearing cover, 7 is a rotor, and 8 is a static pressure with adjustable orifice parameters. Gas radial bearings.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Embodiment 1:

The structure of a static pressure gas radial bearing with adjustable orifice parameters of the present invention is shown in FIG. 1 , an air supply hole 1 is formed on the outer cylindrical surface of the bearing, and a threaded hole 2 is formed under the air supply hole 1 The upper end of the threaded hole 2 communicates with the air supply hole 1, and the lower end is located on the bearing working surface; the threaded hole 2 is provided with a screw 3, and the screw 3 is provided with a throttle hole 4.

As shown in Figure 1, the air supply hole 1 is coaxial with the threaded hole 2, the diameter of the air supply hole 1 is greater than or equal to the diameter of the threaded hole 2; the throttle hole 4 is coaxial with the external thread on the screw.

As shown in Figure 1, the screw 3 and the threaded hole 2 are sealed with thread tightening glue or raw tape.

As shown in Figure 1, when the screw 3 is matched with the threaded hole 2, first insert the through gauge with the same diameter as the inner cylindrical surface of the bearing into the bearing, and then screw the screw 3 into the threaded hole 2. When the pressure equalizing groove 2.1 is not required, the bottom end of the screw 3 is in contact with the outer cylindrical surface of the general gauge; when the pressure equalizing groove 2.1 is required, the bottom end of the screw 3 is kept at a distance from the outer cylindrical surface of the general gauge. This embodiment shows the form in which the pressure equalizing groove is not provided.

As shown in Figure 2, the threaded holes are distributed in one row, two rows or four rows along the axial direction of the bearing, and the threaded holes in each row are evenly distributed along the circumferential direction of the bearing, and the number of each row is 4-24.

As shown in Figures 1 and 2, each row of threaded holes (3) evenly distributed along the bearing circumference, the orifices (5) of the screws (4) can be of the same size, or can be arranged according to actual needs and arrangement to maximize the stiffness and load-carrying capacity of the bearing in the circumferential direction.

As shown in FIG. 3 , the screw 3 includes one or more of a set screw with a hexagonal socket end, a set screw with a slotted end, and a set screw with a cross recessed end.

As shown in Figure 4, the throttle hole 1 opened on the screw 3 is a through hole, and the screw 3 is divided into various specifications according to the different diameter d of the throttle hole 4. The screw 4 with different lengths can also be throttled according to requirements. Hole 5 to change the orifice depth h; the orifice diameter d is 0.1-0.8mm, and the orifice depth h is 3-30mm.

As shown in Figure 2, Figure 3, Figure 4, in order to change the arrangement of the orifice 4 on the bearing, some screws 4 may not have the orifice.

In this embodiment, the threaded holes are distributed in two rows along the axial direction of the bearing, the number of threaded holes in each row is 8, and the screws are set screws with hexagonal socket ends of the same specification.

Example 2:

As shown in Figures 5 and 6, the structure of this embodiment is the same as that of Embodiment 1. The difference is that in this embodiment, the threaded holes are distributed in four rows along the axial direction of the bearing, and the number of threaded holes in each row is It is 16. If you want to change the number of orifice holes, you can use screws with orifice holes and screws without holes in each row of threaded holes at intervals; the distance between the first row of threaded holes 21 and the end face of the bearing seat It is L2, and the end face distance between the second row of threaded holes 22 and the bearing seat is L1. If the end face distance is required to be L1, the first row of threaded holes 21 and the fourth row of threaded holes 24 use unopened screws, and the other two rows use Hole-opened screws; if the end face distance is L2, the second row of threaded holes 22 and the third row of threaded holes 23 use unopened screws, and the other two rows use open-hole screws.

Example 3:

As shown in FIG. 7 , the structure of this embodiment is the same as that of Embodiment 1. The difference is that in this embodiment, the orifices (4) of the same row of screws (3) distributed along the circumferential direction have different diameters .

Example 4:

As shown in FIG. 8 , the rotor 7 passes through the bearing cover plate 6 and the static pressure gas radial bearing 8 with adjustable orifice parameters provided by the present invention, and one end is connected to the impeller 5 . The static pressure gas radial bearing 8 is installed on the bearing cover plate 6, and the two are connected by screws.

The invention has the advantages of simple structure, easy processing and assembly. First, throttling holes with different diameters are opened on the screw, and then the screw is matched with the threaded hole on the outer cylindrical surface of the bearing, and the throttling effect is adjusted by changing the parameters of the orifice hole, and then the stiffness and load capacity of the static pressure gas radial bearing are adjusted. When applied in centrifugal fans, the bearings of the same main shaft diameter can be used under different working fluids and different load conditions, which broadens the application scope of the bearings.

The above content is a further detailed description of the present invention in conjunction with the specific preferred embodiments, and it cannot be considered that the specific embodiments of the present invention are limited to this. Below, some simple deductions or substitutions can also be made, all of which should be regarded as belonging to the invention and the scope of patent protection determined by the submitted claims.

Claims (8)

1. The static pressure gas radial bearing with adjustable throttling hole parameters is characterized in that a gas supply hole (1) is formed in the outer cylindrical surface of the bearing, and a threaded hole (2) is formed below the gas supply hole (1); the orifice at the upper end of the threaded hole (2) is communicated with the air supply hole (1), and the lower end of the threaded hole is positioned on the bearing working surface; and a screw (3) is arranged in the threaded hole (2), and a throttling hole (4) is formed in the screw (3).

2. An orifice parameter adjustable hydrostatic gas radial bearing as claimed in claim 1, wherein: an orifice (4) is formed in the screw (3), the orifice (4) and the external thread on the screw (3) are coaxial, and the aperture of the orifice (4) is 0.1-0.8 mm.

3. An orifice parameter adjustable hydrostatic gas radial bearing as claimed in claim 1, wherein: the threaded holes (2) are distributed in one row or multiple rows along the axial direction of the bearing, each row of threaded holes are uniformly distributed along the circumferential direction of the bearing seat, and the number of each row is 4-24.

4. An orifice parameter adjustable hydrostatic gas radial bearing as claimed in claim 1, wherein: the aperture of the throttling holes (4) in the same row of screws (3) can be the same, and screws with different apertures can be used for arrangement and arrangement according to requirements; the aperture of the throttling holes (4) in the screws (3) can be the same or different among different rows.

5. An orifice parameter adjustable hydrostatic gas radial bearing as claimed in claim 1, wherein: the screw (3) comprises an inner hexagonal concave end holding screw, a straight concave end holding screw and a cross concave end holding screw.

6. An orifice parameter adjustable hydrostatic gas radial bearing as claimed in claim 1, wherein: the air supply hole (1) and the threaded hole (2) are coaxial, and the diameter of the air supply hole (1) is larger than or equal to that of the threaded hole (2).

7. An orifice parameter adjustable hydrostatic gas radial bearing as claimed in claim 1, wherein: the depth of the equalizing groove (2.1) and whether the equalizing groove is arranged or not are changed by changing the depth of the screw (3) screwed into the threaded hole (2).

8. A centrifugal fan, comprising: -an impeller (5), -a bearing cover plate (6), -a rotor (7), said rotor (7) passing through said bearing cover plate (6) and through one orifice parameter adjustable static gas radial bearing (8) of claims 1-7 and being connected at one end to the impeller (5), said one orifice parameter adjustable static gas radial bearing (8) being mounted on the bearing cover plate (6).

Images