Exhaust valve assembly and air bearing

Abstract

The present invention provides an exhaust valve assembly, which includes a housing, an air inlet formed in the housing, a sliding rod disposed in the housing, and a driving device for driving the sliding rod to move. A receiving space is formed in the housing, the air inlet is communicated with the receiving space, the sliding rod is coaxially arranged with the air inlet, and the driving device is used to drive the sliding rod to approach or move away from the air inlet. In the exhaust valve assembly of the present invention, by providing a sliding rod, a spiral moving ring and a ventilation plate, the flow resistance is increased in various ways, the structure is small and exquisite, and the effect is remarkable.

Description

Technical Field

[0001] The present invention relates to an exhaust valve assembly and an air floating bearing. Background Art

[0002] Air static pressure guides are widely used due to their characteristics of small friction coefficient, long working life, and uniform temperature distribution. Higher stiffness, larger load, and flexible and controllable compensation schemes will enable the guide to achieve more excellent performance.

[0003] Currently, most methods for optimizing performance lie in the innovative optimization of throttling methods, as well as the dynamic adjustment of intake pressure and flow rate to increase stiffness. In the prior art, the way to increase the load is to adjust the input pressure or design the flow resistance of the throttle to increase the bearing capacity. Currently, a large number of studies have been conducted on the throttle scheme, and the room for improvement is very small; moreover, in the process of dynamic adjustment, it can only be adjusted by changing the intake pressure, and the efficiency is not high. And if the intake pressure is too high, the phenomenon of gas vibration is likely to occur.

[0004] In view of this, it is necessary to improve the existing exhaust valve assembly to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide an exhaust valve assembly and an air floating bearing to solve the problem of gas vibration caused by insufficient bearing capacity of the existing air static pressure guide.

[0006] To achieve the above purpose, the present invention provides an exhaust valve assembly, which includes a housing, an air inlet formed on the housing, a sliding rod disposed in the housing, and a driving device for driving the sliding rod to move. A receiving space is formed in the housing, the air inlet is connected to the receiving space, the sliding rod is coaxially arranged with the air inlet, and the driving device is used to drive the sliding rod to approach or move away from the air inlet.

[0007] As a further improvement of the present invention, one end of the sliding rod close to the air inlet is conical.

[0008] As a further improvement of the present invention, the exhaust valve assembly further includes a base, an air outlet is formed on the base, and the base is connected to one end of the housing far from the air inlet.

[0009] As a further improvement of the present invention, the base is connected to the receiving space, and a ventilation plate is provided at the connection. The ventilation plate is made of porous material, the sliding rod penetrates through the ventilation plate, and a first rotating bushing is provided between the ventilation plate and the sliding rod.

[0010] As a further improvement of the present invention, the driving device is disposed in the base.

[0011] As a further improvement of the present invention, the exhaust valve assembly further includes a shrapnel, which is arranged at one end of the slide rod away from the air inlet and is fixed to the slide rod.

[0012] As a further improvement of the present invention, the exhaust valve assembly includes a spiral moving ring, which is arranged around the slide rod and abuts against the inner wall of the housing. An annular air passage is provided on the spiral moving ring, and when air flows through the annular air passage, it drives the spiral moving ring to rotate.

[0013] As a further improvement of the present invention, the exhaust valve assembly further includes a fixing plate and a second rotating bushing. The fixing plate is arranged between the spiral moving ring and the air inlet, the slide rod passes through the fixing plate, and the second rotating bushing is arranged between the fixing plate and the slide rod.

[0014] The present invention also provides an air floating bearing, which includes a first inner sleeve, a second inner sleeve arranged at an interval from the first inner sleeve, a rotor sleeved outside the first inner sleeve and the second inner sleeve, a first bearing housing fixed to the first inner sleeve, and a second bearing housing fixed to the second inner sleeve. An annular cavity and an air inlet joint communicated with the annular cavity are provided on the first bearing housing. The exhaust valve assembly and an exhaust passage as described above are provided on the second bearing housing. The air inlet of the exhaust valve assembly is connected to the exhaust passage. Throttle air passages are provided on the first inner sleeve and the second inner sleeve. The throttle air passage on the first inner sleeve is communicated with the annular cavity, and the throttle air passage on the second inner sleeve is communicated with the exhaust passage. Air is introduced into the air inlet joint, enters the throttle air passage through the annular cavity, forms an air film between the rotor and the first inner sleeve and the second inner sleeve, and is discharged through the exhaust valve assembly.

[0015] As a further improvement of the present invention, a throttle is provided at the connection between the throttle air passage and the rotor.

[0016] The beneficial effects of the present invention are as follows: The exhaust valve assembly of the present invention improves the flow resistance in multiple ways by arranging a slide rod, a spiral moving ring and a ventilation plate, and has a small structure and remarkable effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the air floating bearing of the present invention;

[0018] Figure 2 is a schematic structural diagram of the exhaust valve assembly of the present invention;

[0019] Figure 3 is a cross-sectional top view of the exhaust valve assembly of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] As Figures 1 to 3 shown, the air floating bearing 100 of the present invention includes a first inner sleeve 1, a second inner sleeve 2 spaced from the first inner sleeve 1, a rotor 3 sleeved outside the first inner sleeve 1 and the second inner sleeve 2, a first bearing housing 4 fixed to the first inner sleeve 1, and a second bearing housing 5 fixed to the second inner sleeve 2.

[0022] The rotor 3 is rotatably arranged with the first inner sleeve 1 and the second inner sleeve 2 as the rotating shafts.

[0023] The first bearing housing 4 is provided with an annular cavity 41 and an air inlet joint 42 communicating with the annular cavity 41. The second bearing housing 5 is provided with an exhaust valve assembly 6 and an exhaust passage 51. The first inner sleeve 1 and the second inner sleeve 2 are provided with throttle airways 11. The throttle airway 11 on the first inner sleeve 1 is connected to the annular cavity 41, and the throttle airway 11 on the second inner sleeve 2 is connected to the exhaust passage 51. A throttle 12 is provided at the connection of the throttle airway 11 and the rotor 3 to throttle the incoming air and regulate the air flow rate.

[0024] The usage process is as follows: Air is introduced into the air inlet joint 42. The air enters the throttle airway 11 through the annular cavity 41, forms an air film between the rotor 3 and the first inner sleeve 1 and the second inner sleeve 2, thereby reducing the friction between the rotor 3, the first inner sleeve 1 and the second inner sleeve 2. Then, the air flows from the throttle airway 11 of the second inner sleeve 2 into the exhaust passage 51 and the exhaust valve assembly 6 and is discharged through the exhaust valve assembly 6.

[0025] According to the static pressure bearing principle, the impedance of the gas passing through the exhaust valve assembly 6 is R, the exhaust pressure is Pa, the bearing pressure is Po, and the flow rate is Q. According to the mass conservation theorem of the fluid, we can obtain:

[0026] Po–Pa = Q*R;

[0027] In order to increase the bearing pressure Po, it can be achieved by increasing the impedance R of the exhaust valve assembly 6. The exhaust valve assembly 6 of this embodiment can achieve the effect of adjusting the impedance.

[0028] The exhaust valve assembly 6 of this embodiment includes a housing 61, a base 62, an air inlet 63 opened on the housing 61, a slide bar 64 arranged in the housing 61, a driving device 65 for driving the slide bar 64 to move, a spring piece 66, a spiral moving ring 67, a fixing plate 68 and a second rotating bushing 69.

[0029] A receiving space 611 is formed inside the housing 61. The air inlet 63 is connected to the receiving space 611, and the other end of the air inlet 63 is connected to the exhaust passage 51 to receive air.

[0030] The sliding rod 64 is coaxially arranged with the air inlet 63, and the driving device 65 is used to drive the sliding rod 64 to approach or move away from the air inlet 63. One end of the sliding rod 64 close to the air inlet 63 is conical. When the sliding rod 64 approaches the air inlet 63, the air entering from the air inlet 63 is blocked, achieving the effect of changing the gas flow resistance. Being set as conical can guide the entering air towards both sides to smoothly enter the receiving space 611.

[0031] An air outlet 623 is formed on the base 62, and the base 62 is connected to one end of the housing 61 far from the air inlet 63.

[0032] The base 62 is connected to the receiving space 611, and a ventilation plate 621 is arranged at the connection. The ventilation plate 621 is made of porous material. The sliding rod 64 penetrates through the ventilation plate 621, and a first rotating bushing 622 is arranged between the ventilation plate 621 and the sliding rod 64. In this embodiment, the ventilation plate 621 blocks the air outlet 623. When air passes through the ventilation plate 621, it can be further damped due to the influence of the porous material.

[0033] The driving device 65 is arranged inside the base 62 and is fixedly connected to the sliding rod 64 to drive the sliding rod 64 to approach or move away from the air inlet 63.

[0034] The elastic piece 66 is arranged at one end of the sliding rod 64 far from the air inlet 63 and is fixed to the sliding rod 64. So that when the driving device 65 does not work, it can also drive the sliding rod 64 to move to the initial position, that is, to make the sliding rod 64 move away from the air inlet 63.

[0035] The spiral moving ring 67 is arranged around the sliding rod 64 and abuts against the inner wall of the housing 61. An annular air passage 671 is arranged on the spiral moving ring 67, and when air flows through the annular air passage 671, it drives the spiral moving ring 67 to rotate. In this embodiment, the receiving space 611 is cylindrical, the spiral moving ring 67 is integrally cylindrical, takes the sliding rod 64 as the axis, and tightly abuts against the inner wall of the housing 61. The annular air passage 671 is spirally arranged around the periphery of the spiral moving ring 67, and the two ends are respectively connected to the air inlet 63 and the air outlet 623. After air enters from the air inlet 63, it flows along the annular air passage 671, and can drive the spiral moving ring 67 to rotate during the flowing process, thereby converting the gas kinetic energy into the kinetic energy of the spiral moving ring 67 to enhance the damping effect.

[0036] The fixed plate 68 is arranged between the spiral moving ring 67 and the air inlet 63. The sliding rod 64 penetrates through the fixed plate 68. The second rotating bushing 69 is arranged between the fixed plate 68 and the sliding rod 64 for supporting the sliding rod 64.

[0037] In this embodiment, the spiral moving ring 67 is located between the fixed plate 68 and the ventilation plate 621, and the sliding rod 64 is defined by the fixed plate 68 and the ventilation plate 621. In this embodiment, the ventilation plate 621 abuts and is fixed to the outer shell 61, while leaving a gap so that air can enter the spiral moving ring 67.

[0038] For the air floating bearing 100 of the present invention, by providing the exhaust valve assembly 6, the flow resistance of exhaust is increased, so that the bearing pressure of the air floating bearing 100 can be improved, and it is not easy to have an air shock phenomenon even when the intake pressure increases; for the exhaust valve assembly 6 of the present invention, by providing the sliding rod 64, the spiral moving ring 67 and the ventilation plate 621, the flow resistance is increased in various ways, and the structure is small and the effect is remarkable.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. An exhaust valve assembly, characterized in that: The exhaust valve assembly includes a shell, an air inlet opened on the shell, a sliding rod arranged in the shell, a driving device for driving the sliding rod to move, and a spring fixed to the sliding rod. A receiving space is formed in the shell, the air inlet is communicated with the receiving space, the sliding rod is coaxially arranged with the air inlet, the spring is arranged at one end of the sliding rod away from the air inlet, the driving device is used to drive the sliding rod close to or away from the air inlet, and when the driving device is not working, the spring drives the sliding rod to move to an initial position.

2. The exhaust valve assembly according to claim 1, characterized in that: One end of the sliding rod close to the air inlet is tapered.

3. The exhaust valve assembly according to claim 1, characterized in that: The exhaust valve assembly further includes a base, an air outlet is provided on the base, and the base is connected to an end of the shell away from the air inlet.

4. The exhaust valve assembly according to claim 3, characterized in that: The base is communicated with the receiving space, and a ventilation plate is provided at the connection. The ventilation plate is made of porous material. The slide rod passes through the ventilation plate, and a first rotating bushing is provided between the ventilation plate and the slide rod.

5. The exhaust valve assembly according to claim 3, characterized in that: The driving device is arranged in the base.

6. The exhaust valve assembly according to claim 1, wherein: The exhaust valve assembly includes a spiral dynamic ring, which is arranged around the slide rod and abuts against the inner wall of the shell. The spiral dynamic ring is provided with an annular air channel, and the spiral dynamic ring is driven to rotate when air flows through the annular air channel.

7. The exhaust valve assembly according to claim 6, characterized in that: The exhaust valve assembly further includes a fixed plate and a second rotating bushing, wherein the fixed plate is arranged between the spiral dynamic ring and the air inlet, the sliding rod passes through the fixed plate, and the second rotating bushing is arranged between the fixed plate and the sliding rod.

8. An air bearing, characterized in that: The air-floating bearing includes a first inner sleeve, a second inner sleeve spaced apart from the first inner sleeve, a rotor sleeved on the outside of the first inner sleeve and the second inner sleeve, a first bearing shell fixed to the first inner sleeve, and a second bearing shell fixed to the second inner sleeve. The first bearing shell is provided with an annular cavity and an air inlet joint connected to the annular cavity, the second bearing shell is provided with an exhaust valve assembly and an exhaust channel as described in any one of claims 1 to 7, the air inlet of the exhaust valve assembly is connected to the exhaust channel, the first inner sleeve and the second inner sleeve are provided with a throttling air channel, the throttling air channel on the first inner sleeve is connected to the annular cavity, the throttling air channel on the second inner sleeve is connected to the exhaust channel, air is introduced into the intake joint, enters the throttling air channel through the annular cavity, forms an air film between the rotor and the first inner sleeve and the second inner sleeve, and is discharged through the exhaust valve assembly.

9. The air bearing according to claim 8, characterized in that: A throttle is provided at the connection between the throttling air passage and the rotor.

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