High speed frictionless aerodynamic rotary unit structure

Abstract

The application discloses a high-speed frictionless pneumatic rotating unit structure applied to the technical field of rotating shafts, and the high-pressure airflow is sent into the gas chamber in the axial air floating turntable module through a gas feeding pipe, the high-pressure airflow is discharged outward from the gas outlet holes on the upper and lower surfaces of the air floating turntable module, the air floating turntable module is suspended in the rotating groove, the contactless rotation of the rotating shaft body 1 and the air floating turntable module is realized, since all the gas outlet holes are communicated with the same gas chamber, therefore, the total air pressure in the gas chamber only needs to be controlled, the blowing pressure of each gas outlet hole can be uniformly controlled, compared with the traditional structure, the air floating stability can be more effectively ensured, and then the rotating effect and service life of the rotating shaft body are effectively improved; the airflow blown out from the gas outlet holes below the air floating turntable module is recombined into the airflow in the shaft of the gas feeding pipe through the air return holes, the airflow oscillation inside the rotating groove is effectively prevented, and the rotating stability of the rotating shaft body is further effectively improved.

Description

Technical Field

[0001] This invention relates to the field of rotating shaft technology, and in particular to a high-speed frictionless pneumatic rotating unit structure. Background Technology

[0002] Currently, there are various types of rotary shaft structures used in high-precision positioning platforms. Most rotary shaft structures use direct contact. However, during the high-speed rotation of the platform, the connected shafts wear due to friction. As the rotation time increases, the stability of the rotation decreases, affecting the accuracy of the high-precision positioning platform. For example, Chinese patent CN105478808B discloses a pneumatic spindle device with a hemispherical bearing. The air bearing is a sliding bearing that uses gas as a lubricant. High-pressure gas forms an air film between the journal and the bearing ring to achieve contactless support of the rotary shaft structure. Another example is an air suspension bearing with an axial suspension self-correcting structure disclosed in Chinese patent CN113915234B. The high-pressure gas input method used in existing air suspension rotary structures is relatively complex. The high-pressure gas needs to undergo complex air pressure correction to stabilize the stability of the air suspension rotary structure. Summary of the Invention

[0003] The core of this invention lies in the concentrated blowing of high-pressure airflow through the air-float turntable module, which facilitates uniform air pressure correction and solves the problem that the rotational stability of the air-float rotating structure is easily affected by airflow oscillation in the prior art.

[0004] To solve the above problems, the present invention adopts the following technical solution.

[0005] A high-speed frictionless pneumatic rotating unit structure includes a rotating shaft body with a rotating groove at the bottom end. An air-bearing turntable module is rotatably connected inside the rotating groove. A gas inlet pipe shaft is fixedly connected to the middle of the air-bearing turntable module. A rotating shaft fixing ring is fixedly connected to the outside of the rotating groove and is sleeved with the gas inlet pipe shaft. An air chamber is formed inside the air-bearing turntable module and is fixedly connected to the gas inlet pipe shaft. Multiple evenly distributed air outlet holes are formed between the upper and lower surfaces of the air-bearing turntable module and the air chamber. An air outlet cavity is formed in the middle of the rotating shaft body and communicates with the rotating groove. A sealing ring is fitted between the bottom of the inner ring of the rotating shaft fixing ring and the gas inlet pipe shaft. The sealing ring and the gas inlet pipe shaft are fixedly connected by bolts. Multiple layers of oil seals are fixedly connected to the outside of the sealing ring. The oil seals slide in contact with the inner ring wall of the rotating shaft fixing ring. A return air hole is opened at the connection end of the gas inlet pipe shaft and the air flotation turntable module. A one-way air plug is fixedly connected inside the return air hole.

[0006] Furthermore, a gas input rotary joint is rotatably connected to the bottom end of the gas inlet pipe shaft, and a gas output rotary joint is rotatably connected to the top end of the shaft body, with the gas output rotary joint communicating with the top end of the outlet pipe cavity.

[0007] Furthermore, an oil storage chamber is provided inside the sealing ring, and an oil outlet is provided between two adjacent oil seal rings, with the oil outlet communicating with the oil storage chamber.

[0008] Furthermore, an oil injection hole is provided at one end of the bottom of the sealing ring, and a pressure seal plug is connected to the internal thread of the oil injection hole.

[0009] Preferably, the outer ring of the air flotation turntable module has multiple evenly distributed circumferential holes, which are connected to the air chamber.

[0010] Furthermore, a separator ring is fixedly connected to the bottom of the outer ring of the air flotation turntable module, and the height of the upper surface of the separator ring is lower than the setting height of the hole around the disc.

[0011] Furthermore, a base plate is laid inside the rotating trough. The outer diameter of the base plate is smaller than the inner diameter of the rotating trough, and a support pad is fixedly connected between the base plate and the inner wall of the inner end of the rotating trough. The distance between the base plate and the upper surface of the air flotation turntable module and the distance between the rotating shaft fixing ring and the lower surface of the air flotation turntable module are the same.

[0012] Furthermore, a conical hole is provided in the middle of the base plate. The conical hole is coaxially arranged with the air outlet cavity, and a guide diaphragm is fixedly connected to the upper opening of the conical hole. The outer ring of the top of the guide diaphragm contacts the inner wall of the bottom end of the air outlet cavity, and the guide diaphragm is made of elastic silicone rubber material.

[0013] Compared with the prior art, the advantages of this invention are: (1) In this invention, a high-pressure airflow is introduced into the air chamber of the air flotation turntable module through a gas inlet pipe. The high-pressure airflow is discharged outward from the air outlets on the upper and lower surfaces of the air flotation turntable module, so that the air flotation turntable module is suspended in the rotating groove, realizing the non-contact rotation of the rotating shaft 1 and the air flotation turntable module. Since all the air outlets are connected to the same air chamber, it is only necessary to control the total air pressure in the air chamber to uniformly regulate the blowing pressure of each air outlet. Compared with the traditional structure, this centralized control method can more effectively ensure the air flotation stability, thereby effectively improving the rotation effect and service life of the rotating shaft.

[0014] (2) The present invention uses a sealing ring and an oil seal to seal the rotating shaft fixing ring and the gas inlet pipe shaft with oil, which effectively avoids air leakage between the rotating shaft fixing ring and the gas inlet pipe shaft. When the airflow blown out from the air outlet below the air flotation turntable module passes through the inner ring of the rotating shaft fixing ring and descends, this part of the airflow is re-integrated into the airflow in the gas inlet pipe shaft through the return air hole, which effectively stabilizes this part of the airflow. This effectively prevents the airflow from being disturbed and oscillating inside the rotating groove by the airflow blown out from the air outlet above the air flotation turntable module, thereby effectively improving the rotational stability of the rotating shaft body.

[0015] (3) The present invention sets a high-pressure airflow to be discharged outward from the circumferential hole on the outer periphery of the air flotation turntable module. The pressure of the airflow effectively prevents the air flotation turntable module from contacting the inner wall of the rotating groove, thereby further improving the rotational stability of the rotating shaft. Furthermore, the airflow blown out from the circumferential hole is blocked by the partition ring, so that this part of the airflow rises and passes through the gap between the pad and the rotating groove, effectively reducing the influence of this part of the airflow on the airflow blown out from the air outlet above the air flotation turntable module, thereby effectively improving the rotational stability of the rotating shaft. The airflow blown out from the air outlet above the air flotation turntable module directly passes through the conical hole and enters the air outlet cavity, so that the airflow flowing above and below the pad converges in the air outlet cavity and is discharged uniformly through the gas output rotary joint. Attached Figure Description

[0016] Figure 1 This is a cross-sectional perspective view of the present invention; Figure 2 This is a three-dimensional structural diagram of the present invention; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is a diagram illustrating the changes in airflow motion according to the present invention; Figure 5 This is an enlarged view of the sealing ring and vent hole of the present invention; Figure 6 This is a three-dimensional structural diagram of the sealing ring of the present invention; Figure 7 This is a top-view three-dimensional structural diagram of the air flotation turntable module of the present invention; Figure 8 This is a three-dimensional structural diagram of the rotating shaft, the air flotation turntable module, and the base plate of the present invention. Figure 9 This diagram illustrates the changes in airflow above and below the base plate of the present invention.

[0017] Explanation of the labels in the diagram: 1. Rotary shaft body, 101. Rotary groove, 102. Air flotation turntable module, 103. Gas inlet pipe shaft, 104. Rotary shaft fixing ring, 105. Air chamber, 106. Air outlet, 107. Air outlet pipe cavity, 108. Sealing ring, 109. Oil seal ring, 110. Air return hole, 111. One-way air plug, 112. Gas input rotary joint, 113. Gas output rotary joint, 114. Oil storage chamber, 115. Oil outlet, 116. Oil injection hole, 117. Pressure seal plug, 2. Disc peripheral hole, 201. Separating ring, 202. Base plate, 203. Support pad, 204. Conical hole, 205. Guide diaphragm ring. Detailed Implementation

[0018] The technical solutions will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0019] First implementation method: Please see Figures 1 to 5 A high-speed frictionless pneumatic rotating unit structure includes a rotating shaft 1, with a rotating groove 101 at the bottom end of the rotating shaft 1. An air-bearing turntable module 102 is rotatably connected inside the rotating groove 101. A gas inlet pipe shaft 103 is fixedly connected to the middle of the air-bearing turntable module 102. A rotating shaft fixing ring 104 is fixedly connected to the outside of the rotating groove 101, and the rotating shaft fixing ring 104 is sleeved with the gas inlet pipe shaft 103. The rotating shaft 1 is connected to the gas inlet pipe shaft 103 by the rotation of the air-bearing turntable module 102 within the rotating groove 101. The air-bearing tube shaft 103 forms a rotating unit structure. An air chamber 105 is provided inside the air-bearing turntable module 102, which is fixedly connected to the air-bearing tube shaft 103. Multiple evenly distributed air outlets 106 are provided between the upper and lower surfaces of the air-bearing turntable module 102 and the air chamber 105. High-pressure airflow from the air chamber 105 is discharged outwards through the air outlets 106, causing the air-bearing turntable module 102 to suspend within the rotating groove 101, thus achieving the rotation of the air-bearing tube shaft 102. The air flotation turntable module 102 rotates without contact. Since all air outlets 106 are connected to the same air chamber 105, the blowing pressure of each air outlet 106 can be uniformly controlled simply by controlling the total air pressure in the air chamber 105. Compared with the traditional structure, this centralized control method can more effectively ensure the stability of air flotation. An air outlet cavity 107 is opened in the middle of the rotating shaft 1. The air outlet cavity 107 is connected to the rotating groove 101. The bottom end of the gas supply tube 103 is rotatably connected to the gas input rotating section. The top end of the rotating shaft 1 is rotatably connected to the connector 112 and the gas output rotary connector 113. The gas output rotary connector 113 is connected to the top end of the gas outlet chamber 107. The high-pressure airflow is sent into the gas inlet tube 103 through the gas inlet rotary connector 112, so that the high-pressure airflow enters the gas chamber 105 in the air flotation turntable module 102 through the gas inlet tube 103. The airflow in the rotating groove 101 passes through the rotating shaft 1 through the gas outlet chamber 107 and then is discharged through the gas output rotary connector 113. When using this rotating unit structure, high-pressure airflow is sent into the gas inlet tube 103 through the gas inlet rotary joint 112, so that the high-pressure airflow enters the air chamber 105 in the air flotation turntable module 102 through the gas inlet tube 103. The high-pressure airflow in the air chamber 105 is discharged outward from the air outlet 106. Using the pressure of the airflow, the air flotation turntable module 102 is suspended in the rotating groove 101, realizing the rotation of the rotating shaft 1 and the air flotation turntable module 102 without contact. Since all the air outlets 106 are connected to the same air chamber 105, it is only necessary to control the total air pressure in the air chamber 105, that is, to control the gas inlet pressure of the gas inlet tube 103. By uniformly regulating the blowing pressure of each air outlet 106, the centralized control method of blowing pressure can more effectively ensure the stability of air flotation compared with the traditional structure. The airflow entering the rotating groove 101 then passes through the air outlet tube 107 through the rotating shaft 1, and is finally discharged through the gas output rotary joint 113.

[0020] Please see Figure 5 and Figure 6A sealing ring 108 is fitted between the bottom of the inner ring of the rotating shaft fixing ring 104 and the gas inlet pipe shaft 103. The sealing ring 108 is fixedly connected to the gas inlet pipe shaft 103 by bolts, and multiple layers of oil seal rings 109 are fixedly connected to the outside of the sealing ring 108 at equal intervals. The oil seal rings 109 slide in contact with the inner ring wall of the rotating shaft fixing ring 104. The sealing ring 108 and the oil seal rings 109 provide an oil seal between the rotating shaft fixing ring 104 and the gas inlet pipe shaft 103, effectively preventing air leakage. A return air hole 110 is provided at the connection end between 103 and the air flotation turntable module 102. When the airflow blown out from the air outlet 106 below the air flotation turntable module 102 descends through the inner ring of the rotating shaft fixing ring 104, it is returned to the tube shaft 103 via the return air hole 110. This allows the airflow to be re-incorporated into the airflow supplied to the tube shaft 103, effectively stabilizing the airflow blown out from the air outlet 106 below the air flotation turntable module 102, effectively preventing airflow oscillation, and thus effectively improving the rotational stability of the rotating shaft 1. The return air hole 110... An internally fixed one-way air plug 111 is provided to allow one-way flow through the return air hole 110, effectively preventing gas from being sent into the tube shaft 103 and then reversing into the rotating groove 101 through the return air hole 110. An oil storage chamber 114 is provided inside the sealing ring 108, and an oil outlet hole 115 is provided between two adjacent oil seal rings 109. The oil outlet hole 115 communicates with the oil storage chamber 114, which is filled with lubricating oil. The lubricating oil fills the space between the oil seal rings 109 through the oil outlet hole 115, allowing the lubricating oil to flow freely. To effectively reduce friction between the gas inlet pipe shaft 103 and the oil seal ring 109, an oil injection hole 116 is provided at one end of the bottom of the sealing ring 108. Lubricating oil is injected into the oil storage chamber 114 through the oil injection hole 116. The oil injection hole 116 is internally threaded with a pressure sealing plug 117. The pressure sealing plug 117 is used to seal the oil injection hole 116. By controlling the extent to which the pressure sealing plug 117 extends into the oil injection hole 116, the lubricating oil in the oil storage chamber 114 is squeezed from the oil outlet hole 115 into the space between the oil seal rings 109. The sealing ring 108 and the oil seal ring 109 are used to seal the rotating shaft fixing ring 104 and the gas inlet pipe shaft 103 with oil, which effectively prevents air leakage between the rotating shaft fixing ring 104 and the gas inlet pipe shaft 103. When the airflow blown out from the air outlet 106 below the air flotation turntable module 102 passes through the inner ring of the rotating shaft fixing ring 104 and descends, this part of the airflow is re-integrated into the airflow in the gas inlet pipe shaft 103 through the return air hole 110, which effectively stabilizes this part of the airflow and prevents it from affecting the flow of other airflows in the rotating groove 101. This effectively prevents the internal airflow oscillation in the rotating groove 101 and thus effectively improves the rotational stability of the rotating shaft body 1. Lubricating oil is injected into the oil reservoir 114 through the oil injection hole 116, and then the oil injection hole 116 is sealed by the pressure sealing plug 117. By controlling the pressure sealing plug 117 to extend into the oil injection hole 116, pressure is applied to the lubricating oil in the oil reservoir 114, causing the lubricating oil in the oil reservoir 114 to be squeezed from the oil outlet hole 115 into the space between the oil seal rings 109. The lubricating oil effectively reduces the friction between the shaft fixing ring 104 and the oil seal ring 109, and the filling of the oil seal ring 109 with lubricating oil effectively improves the resistance of the oil seal ring 109 to high-pressure airflow, thereby effectively improving the sealing effect of the oil seal ring 109.

[0021] Second implementation method: Compared to the first embodiment, the main addition is a circumferential hole 2, the specific addition structure is as follows, and the rest of the structure is the same as the first embodiment.

[0022] Please see Figure 4 and Figures 7 to 9 The outer ring of the air flotation turntable module 102 is provided with a plurality of evenly distributed circumferential holes 2. The circumferential holes 2 are connected to the air chamber 105. The high-pressure airflow inside the air chamber 105 is blown out through the circumferential holes 2. The airflow pressure is used to apply a thrust between the suspended air flotation turntable module 102 and the inner wall of the rotating groove 101, which effectively prevents the air flotation turntable module 102 from contacting the inner wall of the rotating groove 101, and further improves the rotational stability of the rotating shaft body 1. A partition ring 201 is fixedly connected to the bottom of the outer ring of the air flotation turntable module 102. The upper surface of the partition ring 201 is lower than the setting height of the circumferential hole 2. The airflow blown outward from the circumferential hole 2 is blocked by the partition ring 201, effectively preventing the airflow from descending. This effectively reduces the airflow flowing between the rotating shaft fixing ring 104 and the gas inlet pipe shaft 103. A base plate 202 is laid inside the rotating groove 101. The outer diameter of the base plate 202 is smaller than the inner diameter of the rotating groove 101. A support pad 203 is fixedly connected between the base plate 202 and the inner wall of the inner end of the rotating groove 101. The airflow blown outward from the circumferential hole 2 moves upward. This portion of the airflow passes through the gap between the base plate 202 and the rotating groove 101 and directly enters the air outlet cavity 107, effectively reducing the impact of this portion of the airflow on the airflow blowing through the air outlet 106 above the air flotation turntable module 102, thereby effectively improving the rotational stability of the rotating shaft body 1. The distance between the base plate 202 and the upper surface of the air flotation turntable module 102 and the distance between the rotating shaft fixing ring 104 and the lower surface of the air flotation turntable module 102 are the same, effectively balancing the reverse force of the airflow blowing through the air outlet 106 above and below the air flotation turntable module 102 on the base plate 202 and the rotating shaft fixing ring 104, thereby effectively improving the suspension stability of the air flotation turntable module 102. A conical hole 204 is provided in the middle of the base plate 202. The conical hole 204 is coaxially arranged with the air outlet cavity 107. The airflow flowing in the gap between the base plate 202 and the rotating groove 101 is guided by the outer periphery of the conical hole 204, so that part of the airflow enters the air outlet cavity 107. A guide diaphragm ring 205 is fixedly connected to the upper opening of the conical hole 204. The outer ring of the top of the guide diaphragm ring 205 contacts the inner wall of the bottom end of the air outlet cavity 107. The guide diaphragm ring 205 is made of elastic silicone rubber material. The guide diaphragm ring 205 is used to distinguish the airflow flowing above the base plate 202 and the airflow flowing below the base plate 202. The airflow flowing above the base plate 202 is mainly formed by the circumferential hole 204. The airflow is blown out, and this part of the airflow exerts force on the outer ring of the guide diaphragm 205, causing the guide diaphragm 205 to contract and deform, thereby allowing this part of the airflow to enter the air outlet cavity 107. The airflow flowing below the base plate 202 is mainly blown out through the air outlet 106 above the air flotation turntable module 102. This part of the airflow passes through the conical hole 204 and directly enters the air outlet cavity 107. This part of the airflow exerts force on the inner ring of the guide diaphragm 205. Since the guide diaphragm 205 is in contact with the air outlet cavity 107, the guide diaphragm 205 does not undergo outward expansion deformation. Finally, the airflow flowing above and below the base plate 202 converges in the air outlet cavity 107 and is discharged uniformly through the gas output rotary joint 113. The high-pressure airflow inside the air chamber 105 is blown outward through the circumferential hole 2. The airflow pressure applies a thrust between the suspended air-float turntable module 102 and the inner wall of the rotating groove 101, effectively preventing contact between the air-float turntable module 102 and the inner wall of the rotating groove 101, further improving the rotational stability of the shaft body 1. The airflow blown out from the circumferential hole 2 is blocked by the partition ring 201, guiding this portion of the airflow through the gap between the base plate 202 and the rotating groove 101, effectively reducing the impact of this portion of the airflow on the air-float turntable module 102. The air outlet 106 blows away the influence of the airflow, thereby effectively improving the rotational stability of the rotating shaft 1. The subsequent airflow exerts force on the outer ring of the guide diaphragm 205, causing the guide diaphragm 205 to contract and deform, so that this part of the airflow enters the air outlet cavity 107. The airflow blown out by the air outlet 106 above the air flotation turntable module 102 directly passes through the conical hole 204 and enters the air outlet cavity 107. Finally, the airflow flowing above and below the base plate 202 converges in the air outlet cavity 107 and is discharged uniformly through the gas output rotary joint 113.

[0023] The above description is merely a preferred embodiment of the present invention; it encompasses all the protection scope of the present invention. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solutions and improved concepts of the present invention, should be covered within the protection scope of the present invention.

Claims

1. A high-speed frictionless pneumatic rotating unit structure, comprising a rotating shaft (1), characterized in that: The bottom end of the rotating shaft (1) is provided with a rotating groove (101). The rotating groove (101) is rotatably connected to an air flotation turntable module (102). The middle part of the air flotation turntable module (102) is fixedly connected to a gas inlet pipe shaft (103). The outside of the rotating groove (101) is fixedly connected to a rotating shaft fixing ring (104). The rotating shaft fixing ring (104) is sleeved with the gas inlet pipe shaft (103). The inside of the air flotation turntable module (102) is provided with an air chamber (105). The air chamber (105) is fixedly connected to the gas inlet pipe shaft (103). The upper and lower surfaces of the air flotation turntable module (102) and the air chamber (105) are both provided with a plurality of evenly distributed air outlet holes (106). The middle part of the rotating shaft (1) is provided with an air outlet cavity (107). The air outlet cavity (107) is connected to the rotating groove (101). A sealing ring (108) is fitted between the bottom of the inner ring of the rotating shaft fixing ring (104) and the gas inlet pipe shaft (103). The sealing ring (108) and the gas inlet pipe shaft (103) are fixedly connected by bolts. A multi-layer oil seal ring (109) is fixedly connected to the outside of the sealing ring (108). The oil seal ring (109) slides in contact with the inner ring wall of the rotating shaft fixing ring (104). A return air hole (110) is opened at the connection end of the gas inlet pipe shaft (103) and the air flotation turntable module (102). A one-way air plug (111) is fixedly connected inside the return air hole (110).

2. The high-speed frictionless pneumatic rotating unit structure according to claim 1, characterized in that: The bottom end of the gas inlet tube (103) is rotatably connected to a gas inlet rotary joint (112), and the top end of the rotating shaft (1) is rotatably connected to a gas outlet rotary joint (113). The gas outlet rotary joint (113) is connected to the top end of the gas outlet cavity (107).

3. The high-speed frictionless pneumatic rotating unit structure according to claim 1, characterized in that: The sealing ring (108) has an oil storage chamber (114) inside, and an oil outlet (115) is provided between two adjacent oil seal rings (109), and the oil outlet (115) is connected to the oil storage chamber (114).

4. The high-speed frictionless pneumatic rotating unit structure according to claim 3, characterized in that: The sealing ring (108) has an oil injection hole (116) at one bottom end, and the oil injection hole (116) is internally threaded with a pressure sealing plug (117).

5. The high-speed frictionless pneumatic rotating unit structure according to claim 1, characterized in that: The outer ring of the air flotation turntable module (102) is provided with a plurality of evenly distributed circumferential holes (2), which are connected to the air chamber (105).

6. The high-speed frictionless pneumatic rotating unit structure according to claim 5, characterized in that: The bottom of the outer ring of the air flotation turntable module (102) is fixedly connected to a separator ring (201), and the height of the upper surface of the separator ring (201) is lower than the setting height of the circumferential hole (2).

7. The high-speed frictionless pneumatic rotating unit structure according to claim 5, characterized in that: The interior of the rotating groove (101) is provided with a base plate (202). The outer diameter of the base plate (202) is smaller than the inner diameter of the rotating groove (101). A support pad (203) is fixedly connected between the base plate (202) and the inner wall of the inner end of the rotating groove (101). The distance between the base plate (202) and the upper surface of the air flotation turntable module (102) and the distance between the rotating shaft fixing ring (104) and the lower surface of the air flotation turntable module (102) are the same.

8. The high-speed frictionless pneumatic rotating unit structure according to claim 7, characterized in that: The base plate (202) has a conical hole (204) in the middle. The conical hole (204) is coaxially arranged with the air outlet cavity (107). A guide diaphragm ring (205) is fixedly connected to the outside of the upper opening of the conical hole (204). The outer ring of the top end of the guide diaphragm ring (205) contacts the inner wall of the bottom end of the air outlet cavity (107). The guide diaphragm ring (205) is made of elastic silicone rubber material.

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