Small hole throttling type static pressure gas bearing assembly

Abstract

The utility model discloses a small hole throttling type static pressure gas bearing assembly, and belongs to the field of gas bearings. The bearing is a radial thrust integrated bearing; a plurality of threaded holes which are provided with small throttling holes and serve as air supply channels are formed in the non-working face of the bearing body, and the small throttling holes are communicated with an air cavity in the working face of the bearing. A plurality of air outlet holes communicated with the inner wall of the bearing are formed in the non-working surface of the bearing main body; the inner wall of the bearing body and the end face, provided with the annular groove, of the bearing are covered with coatings with the thickness ranging from 0.01 mm to 0.2 mm. And a sealing ring is arranged between the gas bearing and the shell for conveying gas, so that the gas is prevented from leaking between the shell and the gas bearing. A new composition structure is provided for the static pressure gas bearing, due to the existence of the coating, when the rotor rotating at a high speed is unstable or slightly contacted with the bearing in an emergency, the phenomenon that the rotor is sintered and stuck is basically avoided, the possibility of serious faults when the rotor is used is greatly reduced, the use safety of equipment is improved, and the service life of the equipment is prolonged. The use cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of gas bearings, in particular to a small-hole throttling type static pressure gas bearing component. Background Art

[0002] Gas bearings are a type of sliding bearing that uses gas as a lubricating medium. Since gas has the characteristics of low viscosity, good viscosity-temperature characteristics and radiation resistance, gas bearings have shown excellent application prospects in special occasions such as high speed, high precision, low friction, low power consumption, high and low temperature, and radiation.

[0003] The throttling mechanisms commonly used in hydrostatic gas bearings include small hole throttling, annular throttling, porous throttling, etc. Small hole throttling has greater bearing capacity and stiffness than other throttling forms, so it is widely used. However, due to its poor stability and difficulty in manufacturing, there is still much room for improvement.

[0004] Coating is a common surface treatment method in mechanical processing, which can increase the corrosion resistance and wear resistance of parts. If the coating is damaged, the usability of the material can be evaluated according to the damage of the coating, and whether to repair or re-apply the coating can be selected to restore the performance of the material and reduce the cost of use.

[0005] The utility model adds a polytetrafluoroethylene (PTFE) coating or molybdenum disulfide (MoS) on the basis of the gas static pressure bearing. 2 ) coating, and designed a static pressure gas bearing with high load-bearing capacity, high rigidity and not easy to damage the main shaft. Summary of the invention

[0006] The utility model aims to provide a small-hole throttling static pressure gas bearing assembly to solve the problems of high processing difficulty and insufficient load-bearing capacity of the existing gas bearings.

[0007] The technical solution adopted by the utility model is:

[0008] A small-hole throttling static pressure gas bearing assembly comprises a static pressure gas bearing 1 and a housing 3. The bearing 1 is a radial thrust integrated bearing, comprising a bearing body 101 and a coating 102.

[0009] The non-working surface of the bearing body 101 is provided with two rows of parallel annular grooves 106, and a threaded hole 107 serving as an air supply channel is provided in the annular groove 106. A throttling hole 108 is provided in the threaded hole 107, and the throttling hole 108 is communicated with an air cavity 109 on the inner wall of the bearing body 101, and the air cavity 109 is an annular groove structure.

[0010] One row of threaded holes 107 on the non-working surface of the bearing body 101 serves as an air supply channel, and at the same time, a group of threaded holes 107 directed toward one end face of the bearing body is opened as a starting point, and a throttling hole 108 is opened in the threaded hole 107. The throttling hole 108 communicates with an air cavity 109 on one end face of the bearing body, and the air cavity 109 is an annular groove structure.

[0011] An annular groove 103 is provided on the inner wall of the bearing body; a plurality of vent holes 104 communicating with the annular groove 103 on the inner wall of the bearing are provided on the non-working surface of the bearing body 101; a plurality of through vent holes 105 are provided on the outer surface close to the other end face of the bearing body.

[0012] The inner wall of the bearing body 101 is covered with a coating 102 except for the positions of the pores and the grooves; the end surface of the bearing body 101 with the annular groove is covered with a coating 102 except for the positions of the grooves.

[0013] The coating 102 is made of polytetrafluoroethylene (PTFE) or molybdenum disulfide (MoS 2 ), thickness is 0.01-0.2mm.

[0014] Two sealing grooves are provided on the contact surface between the shell 3 and the gas bearing 1. During assembly, a sealing ring 2 is provided between the gas bearing 1 and the shell 3 for conveying gas to prevent gas leakage between the shell 3 and the gas bearing 1.

[0015] The shell 3 has two rows of gas pipelines 301 which are connected to the annular groove 106 on the gas bearing 1 ; the shell 3 has an annular groove 302 which is connected to the gas outlet 104 on the gas bearing 1 ; and the annular groove 302 has a plurality of gas outlets 303 .

[0016] The advantages of the utility model are:

[0017] The utility model provides a new structure for the gas bearing, which greatly reduces the use cost. Since the gas bearing is covered with a polytetrafluoroethylene (PTFE) coating or molybdenum disulfide (MoS 2 ) coating, when the high-speed rotating rotor becomes unstable or encounters an emergency and slightly contacts the bearing, sintering and jamming will not occur; or when it is jammed, the main shaft rotor of the general important component will not be damaged, only the gas bearing coating is damaged. After replacing the gas bearing, the equipment can resume operation. The gas bearing with damaged coating can be judged to be repairable and can be restored to use after treatment, reducing production costs.

[0018] The utility model provides a new assembly scheme for a gas bearing and solves the design problem of a shell for conveying gas during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the assembly structure of the gas bearing assembly of the utility model.

[0020] Figure 2 It is a left side view of the gas bearing of the utility model.

[0021] Figure 3 It is a structural schematic diagram of the gas bearing of the utility model.

[0022] Figure 4 It is a schematic diagram of the cross-sectional structure of the gas bearing throttle of the utility model.

[0023] Marks and corresponding parts names in the attached drawings:

[0024] 1-gas bearing, 2-seal ring, 3-housing, 4-rotor;

[0025] 101-gas bearing body, 102-gas bearing coating, 103-annular groove, 104-gas outlet, 105-gas outlet, 106-annular groove, 107-threaded hole, 108-throttling hole, 109-air cavity, 301-gas transmission pipeline, 302-annular groove, 303-gas outlet. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The schematic embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0027] Example:

[0028] See also Figure 1-Figure 4 The small-hole throttling static pressure gas bearing assembly described in the utility model includes a static pressure gas bearing 1 and a housing 3, wherein the gas bearing is a radial thrust integrated bearing, including a bearing body 101 and a coating 102.

[0029] Two rows of annular grooves 106 are provided on the non-working surface of the bearing body 101, and the annular grooves 106 are communicated with the threaded holes 107. A throttling hole 108 is provided in the threaded holes 107, and the throttling hole 108 is communicated with the inner wall of the bearing body 101 and the air cavity 109 on one side section, and the air cavity 109 is an annular groove structure; a plurality of air outlet holes 104 communicating with the annular grooves 103 on the inner wall of the bearing are provided on the non-working surface of the bearing body 101; a plurality of through air outlet holes 105 are provided on the outer surface close to the other side end face of the bearing body.

[0030] After the bearing body 101 is processed, the inner wall of the bearing and the end face with the annular groove are coated with a coating (the hole and the groove position need to be blocked). The coating material is polytetrafluoroethylene (PTFE) or molybdenum disulfide (MoS 2), thickness is 0.01-0.2mm.

[0031] Two rows of gas delivery pipelines 301 are provided on the shell 3 ; an annular groove 302 is provided on the shell 3 , and a plurality of gas outlet holes 303 are provided on the annular groove 302 .

[0032] In this embodiment, the outer contour of the housing 3 can be determined according to the specific installation environment and is not limited here.

[0033] In this embodiment, compressed gas enters from the gas supply pipeline 301 of the shell 3, flows into the gas supply threaded hole 107 through the annular groove 106 on the non-working surface of the gas bearing 1, passes through the throttle, reaches the gap between the gas bearing and the rotor 4, and forms a stable gas film to serve the purpose of support and thrust. Then the gas flows out of the gas bearing from the outlet holes 104 and 105.

[0034] The above content is a further detailed description of the utility model in combination with a specific preferred implementation method. It cannot be determined that the specific implementation methods of the utility model are limited to this. For ordinary technicians in the technical field to which the utility model belongs, they can make several simple deductions or substitutions without departing from the concept of the utility model, which should be regarded as belonging to the utility model and the scope of patent protection determined by the submitted claims.

Claims

1. A small-hole throttling static pressure gas bearing assembly, comprising a static pressure gas bearing and a housing, characterized in that: The bearing is a radial thrust integrated bearing, comprising a bearing body and a coating; two rows of annular grooves are provided on the non-working surface of the bearing body, a threaded hole with a throttling hole as an air supply channel is provided in the annular groove, the throttling hole is communicated with the air cavity on the inner wall of the bearing body, and the air cavity is an annular groove structure; a threaded hole with a throttling hole as an air supply channel is provided on the non-working surface of the bearing body, the throttling hole is communicated with the air cavity on one end face of the bearing body, and the air cavity is an annular groove structure; an annular groove is provided on the inner wall of the bearing body; a plurality of air outlet holes communicating with the annular groove on the inner wall of the bearing are provided on the non-working surface of the bearing body; a plurality of through air outlet holes are provided on the outer surface close to the other end face of the bearing body; the inner wall of the bearing body, except for the positions of the air holes and the grooves, is covered with a coating with a thickness of 0.01-0.2mm; the end face of the bearing with the annular groove, except for the position of the groove, is covered with a coating with a thickness of 0.01-0.2mm.

2. The small-hole throttling static pressure gas bearing assembly according to claim 1, characterized in that: The coating material is polytetrafluoroethylene (PTFE) or molybdenum disulfide (MoS2).

3. The small-hole throttling static pressure gas bearing assembly according to claim 1, characterized in that: Two sealing grooves are provided on the contact surface between the shell and the gas bearing. During assembly, a sealing ring is provided between the gas bearing and the shell for conveying gas to prevent gas leakage between the shell and the gas bearing. Two rows of gas pipelines are provided on the shell, which are connected to the annular groove of the gas supply channel on the gas bearing. An air cavity with an annular groove structure is provided on the shell, which is connected to the air outlet.

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