Stepped hole air bearing convenient to machine

Abstract

A stepped hole air bearing convenient to machine comprises a base body and a throttling plate. The base body comprises a main body, a throttle plate installation groove and an air inlet hole. The throttling hole mounting groove comprises a mounting groove body and an airflow communicating groove formed in one side of the mounting groove body. The throttling plate comprises a plate body and at least one throttling hole formed in the plate body. And each throttling hole comprises a first throttling hole, a pressure equalizing cavity and a second throttling hole. The first throttling hole and the pressure equalizing cavity are drilled oppositely from the two sides of the plate body respectively, and a partition plate which is 0-3 mm thick and easy for small hole machining is formed between the first throttling hole and the pressure equalizing cavity. And the second throttling hole is formed in the spacing plate, so that the second throttling hole can be drilled by adopting conventional machining equipment.

Description

Technical Field

[0001] The utility model relates to the field of small hole type air bearings, in particular to a step hole air bearing which is easy to process. Background Art

[0002] Air bearings are fluid-lubricated bearings that use gas as a lubricant, and small-hole air bearings are a branch of these bearings that use a single or multiple small holes as throttles. The principle is that external air is pressed into the bearing, and then a throttling effect is generated when it passes through the small-hole throttle. The gas flow rate increases after passing through the orifice, forming a solid and stable air mold between the air bearing and the support surface, achieving non-contact support, thereby achieving a lubrication effect.

[0003] The existing porous air bearings mainly adopt the inlay form of gem small hole throttle, that is, after the shell with air passage is processed, the gem throttle with small hole is inlaid into it. Although this method is conducive to mass production of air bearings with different throttle apertures, the mold opening cost is too high when dealing with non-standard and small quantity small hole air bearings. For example, a high-speed spiral groove small hole throttle hydrostatic gas bearing device disclosed in patent number CN 113431844 A has multiple air delivery holes and throttles, which makes its overall manufacturing process complicated and the mold opening cost high, which is not conducive to non-standard and small quantity production. Summary of the invention

[0004] In view of this, the utility model provides an easy-to-process step hole air bearing that can solve the above problems.

[0005] A step hole air bearing that is easy to process, comprising a substrate and a throttle plate arranged on one side of the substrate. The substrate comprises a main body, a throttle plate mounting groove arranged on one side of the main body, and an air inlet hole arranged on the main body and connected to the throttle plate mounting groove. The throttle plate mounting groove comprises a mounting groove main body and an air flow connecting groove arranged on one side of the mounting groove main body. The throttle plate comprises a plate body and a plurality of throttle holes opened on the plate body. The throttle holes penetrate the plate body. Each of the throttle holes comprises a first throttle hole arranged on the side of the plate body facing the substrate, a pressure equalizing cavity arranged on the side of the plate body facing away from the first throttle hole, and a second throttle hole located between the first throttle hole and the pressure equalizing cavity. A partition plate is formed between the pressure equalizing cavity and the first throttle hole, and the thickness of the partition plate is between 0-3 mm. A first throttle hole is arranged on the partition plate, and the second throttle hole connects the first throttle hole and the pressure equalizing cavity, and the diameter of the second throttle hole is between 0.1-0.5 mm.

[0006] Furthermore, the shape and specification of the throttle plate correspond to the throttle plate mounting groove, and the throttle plate mounting groove and the throttle plate are fixedly connected by any one of interference fit, threaded connection and glue bonding.

[0007] Furthermore, the airflow communicating groove is an annular communicating groove, and the shape of the airflow communicating groove is consistent with the shape of the main body.

[0008] Further, the air inlet hole extends in a direction perpendicular to a depth direction of the airflow communicating groove and is connected to the airflow communicating groove.

[0009] Furthermore, the throttle holes are arranged in a matrix or a circle according to the shape of the throttle plate.

[0010] Furthermore, the diameter of the first throttle hole and the diameter of the pressure equalizing chamber are both larger than the diameter of the second throttle hole.

[0011] Furthermore, the throttle hole and the airflow communicating groove are communicated with each other.

[0012] Furthermore, the outer contour of the installation groove body is larger than the outer contour of the airflow connecting groove.

[0013] Compared with the prior art, the utility model provides a step hole air bearing that is easy to process, including a substrate and a throttle plate arranged on one side of the substrate. The substrate includes a main body and a throttle plate mounting groove arranged on one side of the main body. The throttle plate mounting groove includes a mounting groove main body for accommodating the throttle plate and an air flow connecting groove. The air flow connecting groove is an annular connecting groove, which has a low processing depth and a small area compared with air channels or air cavities, and is easier to process. The throttle plate includes a plate body and a plurality of throttle holes opened on the plate body. Each of the throttle holes includes a first throttle hole, a pressure equalizing chamber, and a second throttle hole. The diameters of the first throttle hole and the pressure equalizing chamber are both larger than the diameter of the second throttle hole for easy processing. When processing the throttle plate, the first throttle hole and the pressure equalizing chamber are first processed from both sides of the plate body to form a spacer plate with a thickness of less than 3 mm between the first throttle hole and the pressure equalizing chamber, which is easy to process small holes, and then the second throttle hole is processed on the spacer plate, thereby reducing the processing difficulty of the second throttle hole. Therefore, the split design reduces the difficulty of machining the air bearing as a whole, especially makes the perforation thickness of the second throttle hole between 3 mm, so that the air bearing as a whole can be completed using ordinary machining equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model provides a schematic diagram of the exploded structure of a step hole air bearing that is easy to process.

[0015] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of an easy-to-process step hole air bearing.

[0016] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of an easy-to-process step hole air bearing. DETAILED DESCRIPTION

[0017] The following is a further detailed description of the specific embodiments of the present invention. It should be understood that the description of the present invention herein is not intended to limit the protection scope of the present invention.

[0018] like Figures 1 to 3 As shown, it is a schematic diagram of the structure of a step hole air bearing that is easy to process provided by the utility model. The step hole air bearing that is easy to process includes a base 10 and a throttle plate 20 arranged on one side of the base 10. It is conceivable that the step hole air bearing that is easy to process should also include some other functional components, such as dustproof components, connection components, etc., which are well-known technologies to those skilled in the art and will not be described one by one here.

[0019] The base body 10 includes a main body 11 , a throttle plate mounting groove 12 disposed on one side of the main body 11 , and an air inlet hole 13 disposed on the main body 11 and connected to the throttle plate mounting groove 12 .

[0020] The specific scale of the main body 11 can be designed according to actual needs, and the main body 11 can be a square body or a cylinder.

[0021] The throttle plate mounting groove 12 is provided on one side of the main body 11, and includes a mounting groove main body 121, and an airflow communication groove 122 provided on one side of the mounting groove main body 121. The shapes of the mounting groove main body 121 and the airflow communication groove 122 correspond to the shape of the main body 11, and can be circular or square. The outer contour of the mounting groove main body 121 is larger than the outer contour of the airflow communication groove 122. The mounting groove main body 121 is used to accommodate the throttle plate 20. The airflow communication groove 122 is an annular communication groove provided at one end of the throttle plate mounting groove 12, which is lower in depth and easier to process than air cavities, airways, etc. When the main body 11 is a square body structure, the airflow communication groove 122 can be a square ring, and when the main body 11 is a cylindrical structure, the airflow communication groove 122 can be a circular ring structure, so that the airflow communication groove 122 can correspond to the arrangement of the throttle holes, so that the connectivity of the air bearing is better.

[0022] The air inlet hole 13 extends in a direction perpendicular to the depth direction of the air flow communicating groove 122 and penetrates the air flow communicating groove 122 , thereby conveying external air into the air flow communicating groove 122 .

[0023] The throttle plate 20 includes a plate body 21 and a plurality of throttle holes 22 opened on the plate body 21 .

[0024] The plate body 21 is arranged corresponding to the mounting groove body 121, and can be arranged in a circular or square shape according to the structure of the body 11. Preferably, when the body 11 is cylindrical, the plate body 21 can be circular, and when the body 11 is a square structure, the plate body 21 can be a corresponding square. The corresponding design of the shape makes the overall appearance elements of the air bearing more consistent and more aesthetically pleasing. At the same time, the consistent shape can set a larger number of evenly distributed throttle holes 22, making the performance of the air bearing more stable. The plate body 21 can be fixedly installed in the throttle plate mounting groove 12 by interference fit, threaded connection, glue bonding, etc., and can be further sealed with sealing components such as O-rings.

[0025] The throttle holes 22 can be arranged in a matrix or a circle on the plate body 21 according to the shape of the plate body 21. When the plate body 21 is square, the throttle holes 22 are arranged in a matrix, and when the plate body 21 is round, the throttle holes are arranged in a circle, thereby ensuring that the throttle holes 22 are evenly distributed on the plate body 21 so that the air outlet surface of the air bearing is evenly stressed and the air film is formed stably.

[0026] Each of the throttling holes 22 includes a first throttling hole 221 arranged on the side of the plate body 21 facing the base body 10, a pressure equalizing chamber 222 arranged on the side of the plate body 21 facing away from the first throttling hole 221, and a second throttling hole 223 arranged between the first throttling hole 221 and the pressure equalizing chamber 222.

[0027] The first throttle hole 221 is in communication with the airflow communication groove 122. The diameter of the first throttle hole 221 is greater than the diameter of the second throttle hole 223, so that the first throttle hole 221 can be processed by a common tool such as a countersunk drill.

[0028] The pressure equalizing chamber 222 and the first throttle hole 221 are drilled from opposite sides of the plate body 21, so as to form a partition plate between the pressure equalizing chamber 222 and the first throttle hole 221, and the thickness of the partition plate is between 0-3 mm, so as to open the second throttle hole 223. The diameter of the pressure equalizing chamber 222 is larger than the diameter of the second throttle hole 223. The pressure equalizing chamber 222 is used to improve the load-bearing capacity and rigidity of the air bearing.

[0029] The second throttle hole 223 is provided on the partition between the first throttle hole 221 and the pressure equalizing chamber 222 and connects the first throttle hole 221 and the pressure equalizing chamber 222. The second throttle hole 223 is a small hole with a diameter between 0.1 and 0.5 mm, which is used to throttle the gas to produce a throttling effect, thereby forming an air film on the outlet surface of the air bearing.

[0030] The throttle hole 22 and the airflow connecting groove 122 are connected to each other. Air enters the airflow connecting groove 122 through the air inlet hole 13, flows out through the throttle hole 22 and produces a throttling effect, and is pressure-equalized by the pressure-equalizing chamber 222 to form a stable supporting air film between the air outlet surface of the air bearing and the support body.

[0031] The air bearing is divided into the base body 10 and the throttle plate 20 by a split processing method and processed separately. The airflow connecting groove 122 is provided on the base body 10, and the air inlet hole 13 is opened to penetrate the airflow connecting groove 122. The throttle plate 20 is provided with the throttle hole 22. The throttle hole 22 includes the first throttle hole 221, the second throttle hole 223, and the equalizing pressure chamber 222. The diameters of the first throttle hole 221 and the equalizing pressure chamber 222 are both larger than the diameter of the second throttle hole 223. During processing, after the equalizing pressure chamber 222 is processed according to the number of the throttle holes 22, the processing depth of the first throttle hole 221 is adjusted according to the needs on the other side of the plate body 21, so that a spacer plate with a thickness of less than 3 mm is formed between the first throttle hole 221 and the equalizing pressure chamber 222, which is conducive to small hole processing. The second throttle hole 223 penetrates the partition plate and communicates with the first throttle hole 221 and the pressure equalizing chamber 222 .

[0032] Compared with the prior art, the utility model provides a step hole air bearing that is easy to process, including a substrate 10 and a throttle plate 20 arranged on one side of the substrate. The substrate 10 includes a main body 11 and a throttle plate mounting groove 12 arranged on one side of the main body 11. The throttle plate mounting groove 12 includes a mounting groove main body 121 for accommodating the throttle plate 20 and an air flow connecting groove 122. The air flow connecting groove 122 is an annular connecting groove, which has a low processing depth and a small area compared to air channels or air cavities, and is easier to process. The throttle plate 20 includes a plate body 21 and a plurality of throttle holes 22 opened on the plate body. The throttle holes 22 include a first throttle hole 221, a pressure equalizing chamber 222, and a second throttle hole 223. The diameters of the first throttle hole 221 and the pressure equalizing chamber 222 are both larger than the diameter of the second throttle hole 223 for easy processing. When processing the throttle plate 20, the first throttle hole 221 and the pressure equalizing chamber 222 are first processed from both sides of the plate body 21 to form a spacer plate with a thickness of 0-3mm between the first throttle hole 221 and the pressure equalizing chamber 222, which is easy to process small holes, and then the second throttle hole 223 is processed on the spacer plate, thereby reducing the processing difficulty of the second throttle hole 223. Therefore, the split design reduces the overall processing difficulty of the air bearing, especially the perforation thickness of the second throttle hole 223 is between 0.1-0.5mm, so that the air bearing can be completed as a whole using ordinary machining equipment.

[0033] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement or improvement within the spirit of the present invention are included in the scope of the claims of the present invention.

Claims

1. An air bearing with a stepped hole that is easy to process, characterized in that: The step hole air bearing that is easy to process includes a substrate and a throttle plate arranged on one side of the substrate, the substrate includes a main body, a throttle plate mounting groove arranged on one side of the main body, and an air inlet hole arranged on the main body and connected to the throttle plate mounting groove, the throttle plate mounting groove includes a mounting groove main body, and an air flow connecting groove arranged on one side of the mounting groove main body, the throttle plate includes a plate body, and a plurality of throttle holes opened on the plate body, the throttle holes penetrate the plate body, each of the throttle holes includes a first throttle hole arranged on the side of the plate body facing the substrate, a pressure equalizing chamber arranged on the side of the plate body facing away from the first throttle hole, and a second throttle hole located between the first throttle hole and the pressure equalizing chamber, a partition plate is formed between the pressure equalizing chamber and the first throttle hole, the thickness of the partition plate is between 0-3mm, the first throttle hole is arranged on the partition plate, the second throttle hole connects the first throttle hole and the pressure equalizing chamber and the diameter of the second throttle hole is between 0.1-0.5mm.

2. The easy-to-process step hole air bearing according to claim 1, characterized in that: The shape and specification of the throttle plate correspond to the throttle plate installation groove, and the throttle plate installation groove and the throttle plate are fixedly connected by any one of interference fit, thread connection and glue bonding.

3. The easy-to-process step hole air bearing according to claim 1, characterized in that: The airflow communicating groove is an annular communicating groove, and the shape of the airflow communicating groove is consistent with the shape of the main body.

4. The easy-to-process step hole air bearing according to claim 1, characterized in that: The air inlet hole extends in a direction perpendicular to a depth direction of the air flow communicating groove and is connected to the air flow communicating groove.

5. The easy-to-process step hole air bearing according to claim 1, characterized in that: The throttle holes are arranged in a matrix or a circle according to the shape of the throttle plate.

6. The easy-to-process step hole air bearing according to claim 1, characterized in that: The diameter of the first throttle hole and the diameter of the pressure equalizing chamber are both larger than the diameter of the second throttle hole.

7. The easy-to-process step hole air bearing according to claim 1, characterized in that: The throttle hole and the airflow communicating groove are communicated with each other.

8. The easy-to-process step hole air bearing according to claim 1, characterized in that: The outer contour of the installation groove body is larger than the outer contour of the airflow communication groove.

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