A high-frequency response controllable liquid hydrostatic bearing

Abstract

The present invention relates to a high-frequency response controllable liquid hydrostatic bearing, which belongs to the technical field of bearings and solves the defects of current controllable liquid hydrostatic bearings. The present invention comprises a lower valve body, wherein the lower valve body is provided with a plurality of throttling components arranged along the circumferential direction, and the throttling components comprise an upper valve body, a film is provided between the upper valve body and the lower valve body, an oil chamber is provided on the inner side of the film and is opened in the lower valve body, the oil chamber is connected with an oil outlet opened in the lower valve body through a gap between the lower valve body and the film, the upper valve body is provided with a driving mechanism matched with the film, the driving mechanism can drive the film to move to adjust the gap size, the oil chamber is connected with an oil inlet channel, and the oil inlet channels corresponding to two relatively arranged throttling components are connected through a connecting groove, and the connecting groove is connected with an oil inlet provided on the lower valve body. The bearing control effect of the present invention is good, the applicable frequency band range is wide, and the processing technology is simple.

Description

Technical Field

[0001] The invention relates to the technical field of bearings, and in particular to a high-frequency response controllable liquid hydrostatic bearing. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Sliding bearings can be used to support sliding, rotating, swinging or reciprocating motion. Compared with rolling bearings, sliding bearings have better load-bearing capacity and vibration reduction capabilities, so they are widely used in aerospace equipment, precision heavy-duty machinery and other fields.

[0004] With the increasing requirements for speed and precision, the demand for sliding bearings is not only to carry the movement of the rotor (shaft), but also to better suppress the vibration generated by the rotor during rotation, and even to obtain the desired axis trajectory through control. Many new structures have been proposed, so that some new sliding bearings have the ability to adjust bearing characteristics, control the radial movement of the rotor, or form the desired axis trajectory, that is, controllable bearings. However, the performance of most controllable bearings is not ideal. The main reasons are: the actuator action speed is not fast enough, the lag effect of oil circuits, nonlinear damping, etc. is significant, the response characteristics of the control system are not good enough, and it is difficult to compensate for errors in time to achieve fast and precise control.

[0005] Patent CN116044903B discloses a high-frequency response controllable hydrostatic bearing with an integrated piezoelectric throttle, in which the piezoelectric throttle is embedded in four oil chambers evenly distributed around the hydrostatic bearing, the intermediate oil circuit is omitted, and an elastic oil storage chamber is added. The novel controllable hydrostatic bearing has the advantages of fast response speed and high control accuracy. However, in the above scheme, after the elastic oil storage chamber stabilizes the pressure fluctuation through the stored elastic potential energy, it takes a certain amount of time to re-store energy. When the pressure fluctuation frequency is too high, the elastic oil storage chamber cannot complete the energy storage in time, which will lead to control failure in certain frequency bands, and multiple elastic oil storage chambers need to be processed and assembled, which is a complicated process. Summary of the invention

[0006] In view of the deficiencies in the prior art, an object of the present invention is to provide a high-frequency response controllable liquid hydrostatic bearing, which overcomes the defects of the current controllable liquid hydrostatic bearings.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0008] In the first aspect, an embodiment of the present invention provides a high-frequency response controllable liquid hydrostatic bearing, including a lower valve body, wherein the lower valve body has a plurality of throttling components arranged circumferentially, the throttling component including an upper valve body, a film is provided between the upper valve body and the lower valve body, an oil chamber is provided on the inner side of the film and is opened in the lower valve body, the oil chamber is connected with an oil outlet opened in the lower valve body through a gap between the lower valve body and the film, the upper valve body is provided with a driving mechanism cooperating with the film, the driving mechanism can drive the film to move to adjust the gap size, the oil chamber is connected with an oil inlet channel, the oil inlet channels corresponding to the two relatively arranged throttling components are connected through a connecting groove, and the connecting groove is connected with the oil inlet provided in the lower valve body.

[0009] Optionally, the communicating groove is a semicircular ring groove.

[0010] Optionally, the oil inlet is connected to the middle position of the semicircular annular groove.

[0011] In the second aspect, an embodiment of the present invention provides a high-frequency response controllable liquid hydrostatic bearing, including a lower valve body, the lower valve body having a plurality of throttling components arranged circumferentially, the throttling component including an upper valve body, a film is provided between the upper valve body and the lower valve body, an oil chamber is provided on the inner side of the film and is opened in the lower valve body, the oil chamber is connected with an oil outlet opened in the lower valve body through a gap between the lower valve body and the film, the upper valve body is provided with a driving mechanism cooperating with the film, the driving mechanism can drive the film to move to adjust the gap size, the oil chamber is connected with the oil inlet channel, all the oil inlet channels are connected through a connecting groove, and the connecting groove is connected with the oil inlet provided in the lower valve body.

[0012] Optionally, the communicating groove is a circular ring-shaped groove.

[0013] Optionally, the lower valve body comprises a valve body portion, a plurality of throttling components are arranged circumferentially on the valve body portion, and cover plates are provided at both ends of the valve body portion;

[0014] The inner end surface of the cover plate is provided with a first groove, and the outer end surface of the valve body is provided with a second groove matching the first groove. After the cover plate is fixed to the lower valve body, the first groove and the second groove form a connecting groove, and the oil inlet is opened on the cover plate.

[0015] Optionally, the oil chamber is a circular oil chamber, the top surface of the oil chamber extends to the outer peripheral surface of the lower valve body, the oil outlet is coaxially arranged with the circular oil chamber and arranged on the inner side of the circular oil chamber, and a gap is formed between the top surface of the lower valve body part between the oil outlet and the circular oil chamber and the film.

[0016] Optionally, the driving mechanism includes a base, which is fixed to the outer side surface of the upper valve body, and a piezoelectric ceramic is provided inside the base. The piezoelectric ceramic contacts one end of the push rod, and the push rod is slidably connected to the upper valve body. The other end of the push rod cooperates with the film, and the other end of the piezoelectric ceramic contacts a threaded adjustment part threadedly connected to the base.

[0017] Optionally, a copper sheet is provided between the film and the lower valve body.

[0018] Optionally, a sealing ring is provided between the push rod and the upper valve body.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. The controllable liquid hydrostatic bearing of the present invention utilizes a connecting groove to connect the oil inlet channels of the relatively arranged throttling components or to connect all the oil inlet channels. When the relatively arranged throttling components work in a differential manner, the pressure on the oil inlet channels of the two relatively arranged throttling components is beneficially affected by the oil inlet channels on the other side, and the pressure at the oil inlet channels remains basically unchanged, which significantly reduces the pressure fluctuation of the oil inlet channels, thereby avoiding the attenuation of the pressure change amplitude of the bearing oil chamber, improving the stability and control effect of the controllable hydrostatic bearing, and having a fast response speed, reducing the delay of the bearing-rotor system. Compared with the use of oil storage chambers and elastic elements, it avoids the energy storage process, and can improve the stability and control effect of the bearing-rotor system within a wider working frequency band.

[0021] 2. The controllable liquid hydrostatic bearing of the present invention avoids the need to process an oil storage chamber for each throttling component by setting a connecting groove, which makes the process simpler. Moreover, a connecting groove connects multiple oil inlet channels, which can reduce the number of channels, reduce the complexity of the structure, make processing more convenient, and reduce processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0023] Figure 1 The overall structure of the embodiment 1 of the present invention is shown in cross section. Figure 1 ;

[0024] Figure 2 The overall structure of the embodiment 1 of the present invention is shown in cross section. Figure 2 ;

[0025] Figure 3 This is a schematic diagram of the cover structure of Example 1 of the present invention;

[0026] Figure 4 This is an overall structural appearance diagram of Embodiment 1 of the present invention;

[0027] Figure 5 This is an exploded schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0028] Figure 6 This is a schematic diagram of the arrangement of the connecting grooves in Embodiment 2 of the present invention;

[0029] Among them, 1. adjusting screw, 2. base, 3. piezoelectric ceramic, 4. second screw, 5. first screw, 6. upper valve body, 7. push rod, 8. sealing ring, 9. balance chamber, 10. copper sheet, 11. oil inlet channel, 12. valve body, 13. oil outlet, 14. connecting groove, 15. cover plate, 16. third screw, 17. first oil inlet part, 18. second oil inlet part, 19. film, 20. oil chamber, 21. gap. DETAILED DESCRIPTION

[0030] Example 1

[0031] This embodiment provides a high-frequency response controllable liquid hydrostatic bearing, such as Figure 1-Figure 5 As shown, it includes a lower valve body, and the lower valve body is provided with multiple throttling components along the circumferential direction. In this embodiment, the lower valve body is provided with four throttling components along the circumferential direction, and adjacent throttling components are arranged at 90° intervals, so that two throttling components are arranged oppositely, and the other two throttling components are arranged oppositely. The structures of the four throttling components are the same, and one of the throttling components is taken as an example for description:

[0032] The throttling assembly comprises an upper valve body 6, a film 19 and a driving mechanism which are coaxially arranged.

[0033] The upper valve body 6 is buckled on the outer peripheral surface of the lower valve body, and a film 19 is provided between the upper valve body 6 and the lower valve body. The film 19 is located in a mounting groove provided on the peripheral surface of the lower valve body. In this embodiment, the film 19 is made of spring steel, and the upper valve body 6 and the film 19 are fixedly connected to the lower valve body by a plurality of threaded fasteners. Specifically, the threaded fastener is a first screw 5, which passes through the upper valve body 6 and the film 19 and is threadedly connected to the lower valve body, thereby realizing that the upper valve body 6 and the film 19 are pressed against the lower valve body.

[0034] Furthermore, a copper sheet 10 is provided between the film 19 and the lower valve body.

[0035] The upper valve body 6 is equipped with a driving mechanism, which is coaxially arranged with the upper valve body 6 and fits with the outer side surface of the film 19 to drive the film 19 to produce deformation movement.

[0036] The driving mechanism includes a base 2, which is fixed to the outer side of the upper valve body 6 by a plurality of second screws 4. A piezoelectric ceramic 3 is provided inside the base 2. One end of the piezoelectric ceramic 3 contacts the end of an adjusting threaded member. The adjusting threaded member is threadedly connected to an adjusting screw 1 on the top of the base 2. The other end of the piezoelectric ceramic 3 contacts one end of a push rod 7. The push rod 7 is coaxially arranged with the piezoelectric ceramic 3. After the push rod 7 passes through the upper valve body 6, the other end of the push rod 7 contacts the film 19. The push rod 7 is slidably connected to the upper valve body 6 so that the push rod 7 can move along its own axial direction. By rotating the adjusting screw 1, the preload force of the push rod 7 on the film 19 can be adjusted.

[0037] Furthermore, a sealing ring 8 is provided between the push rod 7 and the upper valve body 6 to prevent oil leakage.

[0038] The outer side of the film 19 is provided with a balancing chamber 9 opened in the upper valve body 6, the push rod 7 extends into the balancing chamber 9 and contacts the film 19, and the other side of the film 19 is provided with an oil chamber 20 opened in the lower valve body. The oil chamber 20 is a circular oil chamber, and a plurality of through holes are provided on the film 19, through which the oil chamber 20 and the balancing chamber 9 are connected to each other.

[0039] An oil outlet 13 coaxial with the annular oil chamber is provided on the inner side of the annular oil chamber. The oil outlet 13 is opened on the lower valve body and coaxially arranged with the annular oil chamber.

[0040] One end of the oil outlet 13 extends to the outer peripheral surface of the lower valve body, and the other end extends to the inner annular surface of the lower valve body so that the oil outlet 13 is connected to the oil cavity inside the bearing.

[0041] A gap 21 is formed between the top surface of the lower valve body portion between the oil outlet 13 and the oil chamber 20 and the film 19. The gap 21 is an annular gap. The gap 21 connects the oil outlet 13 and the oil chamber 20 to each other. The push rod 7 pushes the film 19 to deform and move, and the size of the gap 21 can be adjusted.

[0042] The oil chamber 20 is connected to one end of the oil inlet channel 11, and the other ends of the oil inlet channels 11 corresponding to the two relatively arranged throttling assemblies are connected to the same connecting groove 14 opened in the lower valve body, that is, the oil inlet channels 11 corresponding to the two relatively arranged throttling assemblies are connected through the connecting groove 14.

[0043] In this embodiment, the connecting groove 14 is a semicircular ring groove, and the lower valve body is also provided with an oil inlet, which includes a first oil inlet portion 17 arranged along the axial direction of the bearing and a second oil inlet portion 18 arranged along the radial direction of the bearing. The second oil inlet portion 18 is connected to the first oil inlet portion 17, and the first oil inlet portion 17 is connected to the connecting groove 14. The second oil inlet portion 18 extends to the circumferential surface of the lower valve body and is used to connect to the oil supply system to facilitate the introduction of oil into the connecting groove 14.

[0044] like Figure 5 As shown, the relatively arranged throttling components are defined as a group, the connecting grooves 14 corresponding to the two groups of throttling components are arranged at 90° intervals along the annular direction of the lower valve body, and the oil inlets corresponding to the two groups of throttling components are arranged at 90° intervals along the annular direction of the lower valve body.

[0045] Specifically, in order to facilitate the processing of the connecting groove 14, the lower valve body includes a valve body portion 12, and the outer peripheral surface of the valve body portion 12 is circumferentially provided with a plurality of throttling components, and the two ends of the valve body portion 12 are fixed with a cover plate 15 by a third screw 16, and the inner side surface of the cover plate 15 is provided with a semicircular first groove, and the outer end surface of the valve body portion 12 is provided with a second groove matching the first groove. After the cover plate 15 and the valve body portion 12 are assembled by the third screw 16, the first groove and the second groove together constitute the connecting groove 14.

[0046] like Figure 4 As shown, the cover plate 15 is provided with an oil inlet, which is connected to the middle position of the connecting groove 14 to allow oil to flow into the connecting groove 14 .

[0047] The inner side surface of the cover plate 15 is provided with a first semicircular groove, and the outer end surface of the valve body 12 is provided with a second groove matching the first groove. After the cover plate 15 and the valve body 12 are assembled by the third screw 16, the first groove and the second groove together constitute a connecting groove 14. The connecting groove 14 is arranged in this way. The first groove and the second groove can be processed on the valve body 12 and the cover plate 15 by milling technology. Compared with multiple independent oil storage tanks or other corresponding structures that may exist in other types of controllable bearings, the structure of the controllable liquid hydrostatic bearing of this embodiment is easy to process and assemble, which reduces the processing cost. Moreover, the oil inlet channels of the relatively arranged throttling components share a connecting groove 14 and an oil inlet, which can reduce the number of channels, reduce complexity, and save costs. In summary, the overall structure of the liquid hydrostatic bearing of this embodiment is simple and the function is reliable.

[0048] The working principle of this embodiment is:

[0049] The oil enters the connecting groove 14 through the oil inlet provided on the cover plate 15, enters the corresponding oil chamber 20 through the connecting groove 14, and finally flows out through the oil outlet 13. Through the four throttling components, the pressure and flow changes in four directions in the oil chamber inside the bearing can be controlled respectively, thereby promoting the change of the radial position of the main shaft, and finally realizing the rapid and accurate control of the axis trajectory.

[0050] Different voltages are applied to the piezoelectric ceramic 3, and the deformation of the piezoelectric ceramic 3 is transmitted to the film 19 through the push rod 7. The deformation of the film 19 causes the size of the gap 21 between the oil chamber 20 and the oil outlet 13 to change, thereby changing the liquid resistance of the throttling component, and realizing the control of the flow rate and pressure of the oil outlet 13 corresponding to the throttling component, thereby changing the pressure of the oil chamber inside the hydrostatic bearing, promoting the change of the axis center position, and realizing vibration suppression and the desired axis center trajectory.

[0051] Specifically, the two throttling components arranged opposite to each other work in a differential manner. When the piezoelectric ceramic 3 of the throttling component on one side is extended, it pushes the push rod 7 to reduce the gap 21, so that the fluid resistance of the throttling component increases and the flow rate decreases, thereby causing the pressure in the oil chamber inside the corresponding bearing to drop. The piezoelectric ceramic 3 of the throttling component on the other side is shortened, the gap 21 increases, the throttling fluid resistance decreases, the flow rate increases, and the pressure in the oil chamber inside the corresponding bearing increases. In this way, the internal main shaft is driven to move, and the axis position is driven to change.

[0052] When the piezoelectric ceramic 3 of the throttling assembly operates at a high frequency, resulting in a rapid change in flow, the oil inlet channel 11 of the throttling assembly will experience a large fluctuation due to the water hammer effect, that is, in the two throttling assemblies arranged relatively to each other, when the flow of one throttling assembly suddenly increases, the pressure of the oil inlet channel 11 decreases, and when the flow of the other throttling assembly suddenly decreases, the pressure of the oil inlet channel 11 increases. The purpose of suddenly increasing the flow rate is usually to quickly increase the pressure of the oil chamber inside the bearing. At this time, the decrease in the inlet pressure of the oil inlet channel 11 makes it difficult to achieve this purpose. Similarly, the purpose of suddenly reducing the flow rate is usually to quickly reduce the pressure of the oil chamber inside the bearing. At this time, the increase in the pressure of the oil inlet channel 11 also makes it difficult to achieve this purpose.

[0053] In this embodiment, by setting a connecting groove 14, the oil inlet channels 11 corresponding to the two relatively arranged throttling assemblies are connected through the connecting groove 14. Because the two throttling assemblies work in a differential manner, the pressure on one oil inlet channel 11 is beneficially affected by the other oil inlet channel 11, thereby offsetting the opposite pressure changes at the two oil inlet channels 11, so that the pressure at the oil inlet channels 11 of the two throttling assemblies remains basically unchanged, significantly reducing the oil pressure fluctuation in the oil inlet channel 11, thereby avoiding the attenuation of the pressure change amplitude of the oil chamber inside the bearing, and improving the stability and control effect of the controllable hydrostatic bearing. Moreover, in this way, compared with the use of an oil storage chamber and an elastic element, the energy storage process is avoided, and the stability and control effect of the hydrostatic bearing-rotor system can be improved within a wide working frequency band. At the same time, the oil inlet is connected to the middle of the connecting groove 14, and the lengths of the connecting groove 14 parts on both sides of the oil inlet are equal, which greatly improves the delay of the operation of the hydrostatic bearing-rotor system, which can also improve the stability and control effect of the controllable hydrostatic bearing to a certain extent.

[0054] For example, Figure 2As shown, the cavity inside the lower valve body is the internal oil cavity of the bearing, and a main shaft is arranged inside the cavity. If the main shaft is pushed to the left, the gap 21 of the left throttling assembly is reduced, the pressure of the oil cavity on the left side of the bearing is reduced, the gap 21 of the right throttling assembly is increased, and the pressure of the oil cavity on the right side of the bearing is increased, pushing the axis to move to the left to a new equilibrium position. At the moment of starting the above action, due to the water hammer effect, the pressure of the oil inlet channel 11 of the left throttling assembly will rise, and the pressure of the oil inlet channel 11 of the right throttling assembly will drop. In this embodiment, by setting a connecting groove 14, the pressure of the oil inlet channel 11 of the throttling assembly on the left and right sides is beneficially affected by the pressure of the oil inlet channel 11 on the opposite side, that is, the pressure of the oil inlet channel 11 on the left side drops and the pressure of the oil inlet channel 11 on the right side rises, which can enhance the control effect of the leftward movement of the axis.

[0055] Example 2

[0056] This embodiment provides a high-frequency response controllable liquid hydrostatic bearing, such as Figure 6 As shown, compared with embodiment 1, the difference is that the four oil inlet channels 11 are all connected to a connecting groove 14, the connecting groove 14 is a circular ring groove, and an oil inlet is provided, and the oil inlet is connected to the connecting groove 14.

[0057] The rest of the structure of this embodiment is the same as that of Embodiment 1 and will not be described again here.

[0058] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-frequency response controllable liquid hydrostatic bearing, characterized in that: The throttling device is a kind of machine-made oil-soluble ... The oil cavity is an annular oil cavity, the top surface of the oil cavity extends to the outer peripheral surface of the lower valve body, the oil outlet is coaxially arranged with the annular oil cavity and arranged on the inner side of the annular oil cavity, and a gap is formed between the top surface of the lower valve body part between the oil outlet and the annular oil cavity and the film; The connecting groove is a semicircular annular groove, and the oil inlet is connected to the middle position of the semicircular annular groove; When different voltages are applied to the piezoelectric ceramic, the deformation of the piezoelectric ceramic is transmitted to the film through the push rod. The deformation of the film causes the size of the gap between the oil chamber and the oil outlet to change, thereby changing the liquid resistance of the throttling component and achieving control of the flow and pressure of the oil outlet corresponding to the throttling component.

2. The high frequency response controllable liquid hydrostatic bearing according to claim 1, characterized in that: The lower valve body comprises a valve body portion, a plurality of throttling components are arranged circumferentially on the valve body portion, and cover plates are provided at both ends of the valve body portion; The inner end surface of the cover plate is provided with a first groove, and the outer end surface of the valve body is provided with a second groove matching the first groove. After the cover plate is fixed to the lower valve body, the first groove and the second groove form a connecting groove, and the oil inlet is opened on the cover plate.

3. The high frequency response controllable liquid hydrostatic bearing according to claim 1, characterized in that: A copper sheet is arranged between the film and the lower valve body.

4. The high frequency response controllable liquid hydrostatic bearing according to claim 1, characterized in that: A sealing ring is arranged between the top rod and the upper valve body.

Images