A sealed shear thickening fluid squeeze film damper

Abstract

The application provides a sealed shear thickening fluid extrusion oil film damper, which comprises a damper inner ring and a damper outer ring which is sealed to the outside of the damper inner ring, the inside of the damper inner ring is connected with a rotor through a bearing, and a gap is formed between the inner wall of the damper outer ring and the outer wall of the damper inner ring, the gap is filled with a working medium, and the working medium is shear thickening fluid; a working medium filling structure is arranged on the damper outer ring and is used for realizing injection and suction of the shear thickening fluid in the gap. The sealed shear thickening fluid extrusion oil film damper does not need a more complex working medium circulating system device, the dependence on a complex structure is reduced, and the damper has a wider engineering application.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mechanical engineering vibration reduction, in particular, especially relates to a closed shear thickening liquid extrusion oil film damper. BACKGROUND

[0002] In the process of high-speed operation of modern rotating machinery, the rotor vibration is often inevitable due to the imbalance of the rotor and various complex excitation forces. Once the rotor amplitude exceeds the limit, it will cause the rubbing between the rotor and the stator, which seriously affects the performance and safe and stable operation of the whole machine. In order to improve the working reliability of the rotor of the rotating machinery, it is necessary to research and design the rotor shaft system damping device.

[0003] The extrusion oil film damper is a damping device widely used in the shaft system of rotating machinery such as aircraft engines. At present, the extrusion oil film damper uses lubricating oil with Newtonian fluid characteristics as working medium to provide additional viscous damping to reduce the rotor amplitude and absorb vibration energy. Since the viscosity of Newtonian fluid remains constant with the change of shear rate, the damping force generated by the extrusion oil film damper often cannot meet the damping requirements under high amplitude working conditions. In recent years, new materials such as electrorheological fluid and magnetorheological fluid have been applied to the research and development of extrusion oil film dampers. The rheological properties of these materials will change under the action of electric field or magnetic field, so that the viscosity can be adapted to different vibration conditions by controlling the electric field or magnetic field current, thereby improving the damping effect. However, due to the need for external excitation power supply, additional electric field or magnetic field device in the working of the electrorheological fluid and magnetorheological fluid extrusion oil film damper, the equipment structure is relatively complex, and the design difficulty of the control system is also great, which has not been applied in engineering.

[0004] Shear thickening fluid is a stress field response intelligent material, whose viscosity is related to shear rate. Under the action of high-speed load, the fluid viscosity will increase rapidly, and the appearance will solidify; after the external load is removed, it can restore its initial state in a short time. Compared with traditional viscous materials, shear thickening fluid can change its viscosity with the change of shear rate, and has the characteristics of self-adaptation. Compared with electrorheological fluid and magnetorheological fluid, it does not need external excitation power supply when used, which reduces the design difficulty. Therefore, the characteristics of shear thickening fluid are very suitable for vibration control field. SUMMARY

[0005] According to the above technical problems, a closed shear thickening liquid extrusion oil film damper is provided.

[0006] The technical means adopted by the present application are as follows:

[0007] The application discloses a closed shear thickening liquid extrusion oil film damper, which comprises a damper inner ring and a damper outer ring which is sealed outside the damper inner ring, the inside of the damper inner ring is connected with a rotor through a bearing, a gap is formed between the inner wall of the damper outer ring and the outer wall of the damper inner ring, and the gap is filled with a working medium, which is shear thickening liquid; a working medium filling structure is arranged on the damper outer ring, and is used for realizing injection and suction of the shear thickening liquid in the gap.

[0008] Further, the damper is in a circular ring type structure, an annular central groove which is in communication with the gap is formed in the inner surface of the damper outer ring in a circumferential direction, and the working medium filling structure is in communication with the central groove.

[0009] Further, the working medium filling structure comprises a liquid inlet through hole and a liquid outlet through hole, the liquid inlet through hole and the liquid outlet through hole are symmetrically arranged on the two radial sides of the damper outer ring, and both penetrate the radial wall of the damper outer ring.

[0010] Further, the liquid inlet through hole is arranged at the lowest position of the damper gap, and the liquid outlet through hole is arranged at the highest position of the gap.

[0011] The outer end of the liquid inlet through hole and the liquid outlet through hole is plugged by a plug, and a sensor can be connected in the liquid inlet through hole and the liquid outlet through hole.

[0012] Further, the bearing is a ball bearing, the ball bearing comprises a ball bearing inner ring, ball bearing balls and a ball bearing outer ring, the ball bearing inner ring is connected with the rotor, the ball bearing balls are connected between the ball bearing inner ring and the ball bearing outer ring, the damper inner ring is installed on the ball bearing outer ring in a sleeve structure, and common movement of the ball bearing outer ring and the damper inner ring is realized through interference fit.

[0013] Further, a slot is arranged on the damper inner ring, a threaded hole is formed on the damper outer ring, and a rotation stopping bolt is connected in the threaded hole in a matched mode; in the working process of the damper, the damper inner ring only performs precession movement and has no rotation movement, the rotation stopping bolt fixed on the damper outer ring is inserted into the slot, and rotation of the damper inner ring is stopped.

[0014] Further, a plurality of compensation grooves are formed in the central groove.

[0015] Further, the volume of the shear thickening liquid filled in the gap is the total volume of the damper gap minus the volume of all the compensation grooves.

[0016] Further, at least one installation groove is formed in the outer wall of the damper inner ring at both ends of the gap, an O-shaped ring is installed in the installation groove, and sealed connection between the damper inner ring and the damper outer ring is realized.

[0017] Further, the shear thickening fluid is prepared by mixing a dispersant and a dispersion medium, the dispersant is low viscosity polyethylene glycol, and the dispersion medium is nano silicon dioxide particles.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] 1. The closed shear thickening fluid extrusion oil film damper of the present application does not need an external more complex working fluid circulating system device, reduces the dependence on complex structure, and has a wider engineering application.

[0020] 2. The working fluid of the closed shear thickening fluid extrusion oil film damper has a shear thickening effect, that is, the viscosity of the working fluid increases with the increase of the precession radius, so that a greater damping force can be generated, and a better damping effect is achieved.

[0021] 3. The shear thickening fluid proposed by the present application is a stress field response intelligent material, which can change its viscosity according to the change of shear rate, and thus has a self-adapting characteristic. The shear thickening fluid extrusion oil film damper is a circular ring type, and the two ends are sealed by O-rings. A central groove structure is arranged on the inner surface of the outer ring of the damper, and two symmetrical through holes are arranged in the groove for injecting and sucking the shear thickening fluid into the gap of the damper. When the shear thickening fluid fills the gap between the inner ring and the outer ring of the damper, the liquid inlet and outlet holes are blocked, forming a closed extrusion oil film damper, which does not need the complex oil supply and discharge circulating device matched with the traditional extrusion oil film damper. The viscosity of the shear thickening fluid increases with the increase of the rotor precession radius during the precession process of the inner ring of the damper, so that a greater damping force is generated, and the rotor has a better damping effect compared with the traditional lubricating oil working fluid extrusion oil film damper.

[0022] Based on the above reasons, the present application can be widely popularized in the field of vibration reduction and the like. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative labor.

[0024] Figure 1 It is a longitudinal sectional view of the closed shear thickening fluid damper of the present application.

[0025] Figure 2 It is an axial central sectional view of the damper of the present application.

[0026] Figure 3 It is an enlarged view of part C in the above figure. Figure 1 ​

[0027] Figure 4 For the purpose of the present invention Figure 2 Partial enlarged view at D in the figure.

[0028] Figure 5 For the purpose of the present invention Figure 2 Partial enlarged view at E in the figure.

[0029] In the figure: 1, rotor; 2, inner ring of ball bearing; 3, ball of ball bearing; 4, outer ring of ball bearing; 5, inner ring of damper; 6, outer ring of damper; 7, liquid inlet through hole; 8, anti-rotation bolt; 9, liquid outlet through hole; 10, first O-ring; 11, second O-ring; 12, center groove; 13, compensation groove. DETAILED DESCRIPTION

[0030] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] It should be noted that the terms used herein are only for the purpose of describing the specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0033] The foregoing is considered as illustrative only of the principles of the application. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the application to the exact construction and practice described. Accordingly, all such variations are intended to be included within the scope of the present application as defined in the following claims, along with full equivalents thereof.

[0034] In the description of the present application, it is to be understood that the orientation terms such as "front", "back", "up", "down", "left", "right", "transverse", "vertical", "horizontal", "top", "bottom", etc. indicate the orientation or positional relationship shown in the drawings, which are merely for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the scope of protection of the present application. The orientation terms "inner", "outer" refer to the inner and outer relative to the contour of the components themselves.

[0035] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper", etc. can be used herein to describe the spatial positional relationship of one device or feature with respect to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the devices described in the drawings. For example, if the devices in the drawings are inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0036] In addition, it should be noted that the use of the terms "first", "second", etc. to describe various components is merely intended to distinguish the corresponding components, and the above terms do not have special meanings unless otherwise stated, and therefore cannot be construed as limiting the scope of protection of the present application.

[0037] The application aims at providing a closed extrusion oil film damper with working medium capable of generating shear thickening effect on the basis of Newton fluid extrusion oil film damper, which has simpler structure and better damping effect.

[0038] The application discloses a closed shear thickening liquid extrusion oil film damper, which is a closed shear thickening liquid extrusion oil film damper using shear thickening liquid as working medium and is used for reducing rotor vibration amplitude. The main structure comprises a damper outer ring 5, a damper inner ring 6, a liquid inlet through hole 7, a rotation stopping bolt 8, a liquid outlet through hole 9, a first O-shaped ring 10, a second O-shaped ring 11, a center groove 12 and a compensation groove 13. The inside of the damper inner ring 5 is connected with the rotor 1 through a ball bearing, and the damper outer ring 6 is sealed outside the damper inner ring 5. The inner wall of the damper outer ring 6 and the outer wall of the damper inner ring 5 have a gap, the gap is filled with working medium, and the working medium in the damper gap is shear thickening liquid prepared in advance. The two ends of the damper gap (the two ends in the direction of the width of the damper) are sealed by O-shaped rings, so as to ensure the airtightness of the damper gap.

[0039] The ball bearing comprises a ball bearing inner ring 2, ball bearing balls 3 and a ball bearing outer ring 4. The ball bearing inner ring 2 is connected with the rotor 1, the ball bearing balls 3 are connected between the ball bearing inner ring 2 and the ball bearing outer ring 4, the damper inner ring 5 is installed on the ball bearing outer ring 4 in a sleeve structure, and the ball bearing outer ring 4 and the damper inner ring 5 are jointly moved through interference fit.

[0040] The damper has a circular ring structure, the center groove 12 is arranged on the inner surface of the damper outer ring 6 in the axial center position and is communicated with the gap, the liquid inlet through hole 7 and the liquid outlet through hole 9 are arranged in the center groove 12 and are used for injecting and sucking the shear thickening liquid working medium into the gap. The liquid inlet through hole 7 and the liquid outlet through hole 9 are symmetrically arranged on the two sides of the radial direction of the damper outer ring 6 and penetrate the radial wall of the damper outer ring 6. The two ends of the damper gap are respectively sealed by the first O-shaped ring 10 and the second O-shaped ring 11. When the shear thickening liquid is injected into the damper gap cavity through the liquid inlet through hole 7 and the liquid outlet through hole 9, the two through holes are blocked, so as to form a closed shear thickening liquid extrusion oil film damper. That is, when the shear thickening liquid fills the gap between the damper inner ring and the damper outer ring, the two through holes are sealed to form a closed extrusion oil film damper, so that the oil supply circulating system device of the traditional extrusion oil film damper is omitted.

[0041] The damper inner ring 5 is provided with a slot, and the slot is located outside the second O-shaped ring 11 in the axial direction. The damper outer ring 6 is provided with a threaded hole, and the rotation stopping bolt 8 is connected in the threaded hole in a matched mode. In the working process of the damper, the damper inner ring 5 only performs precession motion and does not rotate. The rotation stopping bolt 8 fixed on the damper outer ring 6 is used for stopping the rotation of the damper inner ring 5.

[0042] It should be noted that the appendix Figure 1 The inner and outer ring structures of the squeeze film damper in the paper are simplified structures. In actual applications, the structures of the inner and outer rings of the damper are different, but the structure of the gap area between the inner and outer rings of the damper is basically the same.

[0043] The inner ring 5 of the damper has mounting grooves on its outer walls at both ends. The mounting grooves of the first O-ring 10 and the second O-ring 11 are axially sealed and are arranged on the inner ring 5 of the damper. Multiple seals can be arranged on the inner ring 5 of the damper to ensure the sealing effect, depending on the structural dimensions and sealing requirements of the actual application.

[0044] The shear thickening fluid is prepared by mixing low-viscosity polyethylene glycol as a dispersant and nano-silica particles as a dispersion medium. When applying this invention, it is necessary to prepare the optimal concentration of the nano-silica shear thickening fluid according to the working characteristics of the damper. The viscosity of the prepared shear thickening fluid increases with the shear rate, exhibiting different viscosity values ​​under different extrusion speeds within the damper's inner ring, thus generating different damping forces, demonstrating adaptive characteristics. Based on the rotor's requirement for the damping force provided by the shear thickening fluid damper, the optimal concentration of the nano-silica particle dispersant can be determined through simulation and experimentation to ensure that the prepared shear thickening fluid meets the viscosity characteristics of the damper under design conditions, achieving the ideal vibration reduction effect.

[0045] Two through holes are formed in the central groove 12 of the outer ring 6 of the damper: one inlet hole 7 and one outlet hole 9. When installing this shear-thickening fluid extrusion film damper, the inlet hole 7 is positioned at the lowest point of the damper gap, and the outlet hole 9 is positioned at the highest point. Their main function is to ensure that the shear-thickening fluid can smoothly fill the damper gap cavity, and the volume of the injected shear-thickening fluid can be controlled by the flow rate through the two through holes. Subsequently, the shear-thickening fluid working medium in the damper gap can be replaced as needed through the inlet hole 7 and the outlet hole 9.

[0046] After injecting an appropriate amount of shear thickening fluid into the gap, the aforementioned inlet hole 7 and outlet hole 9 can be sealed with plugs to form a closed-loop extrusion oil film damper.

[0047] Appendix Figure 2 and attached Figure 3 The specific positions of the inlet port 7 and outlet port 9 can be adjusted according to the different structures of the actual application. If it is necessary to detect changes in parameters such as pressure or temperature during the operation of the damper, the positions of the inlet port 7 and outlet port 9 can be connected to corresponding sensors.

[0048] Specifically, the inlet port 7 and outlet port 9, once filled with shear-thickening fluid within the damper gap, do not require plugging. To understand the changes in parameters such as liquid film pressure and temperature during damper operation, the inlet port 7 and outlet port 9 can be used as measurement holes for connecting corresponding sensors. That is, if monitoring parameters such as pressure and temperature within the damper gap during operation is considered, suitable sensors can be connected to the inlet port 7 and outlet port 9. In this case, the amount of shear-thickening fluid injected into the damper gap needs to take into account the gap between the port and the sensor.

[0049] When the damper needs to replace the shear thickening fluid working medium in the gap, the inlet port 7 and outlet port 9 can be reopened. Air can be injected into the gap first to ensure that the shear thickening fluid working medium is completely drained, and then the gap can be refilled with new shear thickening fluid.

[0050] Considering the high-speed precession of the inner ring 5 of the damper, and the cavitation and thermal expansion of the shear thickening fluid in the gap within the confined space, three compensation tanks 13 of a certain volume are uniformly arranged within the central tank 12. The total volume of the three compensation tanks 13 can be calculated based on the volume expansion rate of the shear thickening fluid and a given cavitation ratio. Therefore, the volume of the compensation tank 13 is not considered in the initial addition of shear thickening fluid to the gap. The total volume of the compensation tank 13 can be calculated based on the stable temperature and cavitation ratio of the damper during operation. The shear thickening fluid passes through the attached... Figure 3 Appendix Figure 4 The shear thickening fluid is injected into the damper gap through the through-holes. The volume of shear thickening fluid added into the gap is the total volume of the damper gap minus the volume of all compensation grooves. During the injection of shear thickening fluid into the gap, the volume of shear thickening fluid injected into the gap is determined by the volume difference of the shear thickening fluid in the two through-holes.

[0051] The physical properties of the shear thickening fluid are measured, and a certain value of the cavitation ratio in the gap is given. The stable temperature during the operation of the damper is estimated, and the expansion volume of the shear thickening fluid at the highest temperature is determined. This expansion volume is then distributed to the volumes of each compensation tank 13 in the central tank 12.

[0052] During the operation of the closed-loop shear-thickening fluid compression film damper, the inner ring 5 of the damper is restricted from rotation and can only precess. The continuous precession of the inner ring 5 shears and compresses the shear-thickening fluid in the gap, causing the fluid to generate different damping forces, thereby reducing the vibration amplitude of the rotor system. With the continuous precession of the inner ring 5, the viscosity of the shear-thickening fluid increases with the shear rate, resulting in a greater damping effect. The faster the precession speed of the inner ring 5 changes, the greater the shear rate experienced by the shear-thickening fluid, and the greater the resulting damping effect.

[0053] Specifically, the extrusion oil film damper of the closed shear thickening fluid, in the working process, the shear thickening fluid under extrusion has a larger shear rate along the direction of precession, and the viscosity of the shear thickening fluid increases, thereby generating a stronger damping effect. And the faster the inner ring 5 precession speed, the greater the shear rate of the shear thickening fluid, and the stronger the damping effect it generates. That is, the adaptive shear thickening fluid can automatically adapt to the working condition of the damper to change the viscosity value, thereby adjusting the size of the damping force and reducing the vibration amplitude of the rotor system.

[0054] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A closed shear thickening fluid squeeze film damper, characterized by, The application relates to a damping device, which comprises the following components: a damping device inner ring (5) and a damping device outer ring (6) outside the damping device inner ring (5), the inside of the damping device inner ring (5) is connected with a rotor (1) through a bearing, a gap is formed between the inner wall of the damping device outer ring (6) and the outer wall of the damping device inner ring (5), the gap is filled with a working medium, and the working medium is shear thickening liquid; a working medium filling structure is arranged on the damping device outer ring (6) and used for realizing injection and suction of the shear thickening liquid in the gap. The damping device is in a circular ring structure, an annular central groove (12) which is in communication with the gap is formed in the inner surface of the damping device outer ring (6) in the circumferential direction, and the working medium filling structure is in communication with the central groove (12). The working medium filling structure comprises liquid inlet through holes (7) and liquid outlet through holes (9), when it is needed to detect the change of pressure or temperature parameters of the damping device in the working process, the liquid inlet through holes (7) and the liquid outlet through holes (9) are connected with corresponding sensors. A plurality of compensation grooves (13) are formed in the central groove (12). The liquid inlet through holes (7) and the liquid outlet through holes (9) are symmetrically arranged on the two sides of the radial direction of the damping device outer ring (6) and penetrate the radial wall of the damping device outer ring (6).

2. A closed shear thickening fluid squeeze oil film damper according to claim 1, wherein, The liquid inlet through holes (7) are arranged at the lowest position of the damping device gap, and the liquid outlet through holes (9) are arranged at the highest position of the gap.

3. A closed shear thickening fluid squeeze oil film damper according to claim 2, wherein, The bearing is a ball bearing, which comprises a ball bearing inner ring (2), ball bearing balls (3) and a ball bearing outer ring (4), the ball bearing inner ring (2) is connected with the rotor (1), the ball bearing balls (3) are connected between the ball bearing inner ring (2) and the ball bearing outer ring (4), the damping device inner ring (5) is installed on the ball bearing outer ring (4) as a sleeve structure, and common movement of the ball bearing outer ring (4) and the damping device inner ring (5) is realized through interference fit.

4. The enclosed shear thickening fluid squeeze film damper of claim 1, wherein, A slot is arranged on the damping device inner ring (5), a threaded hole is formed in the damping device outer ring (6), and a rotation stopping bolt (8) is matched and connected in the threaded hole; in the working process of the damping device, only the damping device inner ring (5) performs precession movement without rotation movement, the rotation stopping bolt (8) fixed on the damping device outer ring (6) is inserted into the slot, and rotation of the damping device inner ring (5) is stopped.

5. The enclosed shear thickening fluid squeeze film damper of claim 1, wherein, The volume of the shear thickening liquid filled in the gap is the total volume of the damping device gap minus the volume of all the compensation grooves (13).

6. The enclosed shear thickening fluid squeeze film damper of claim 1, wherein, At least one installation groove is formed in the outer wall of the damping device inner ring (5) at both ends of the gap, an O-shaped ring is installed in the installation groove, and sealed connection between the damping device inner ring (5) and the damping device outer ring (6) is realized.

7. The enclosed shear thickening fluid squeeze film damper of claim 1, wherein, The shear thickening liquid is prepared by mixing a dispersant and a dispersion medium, the dispersant is low-viscosity polyethylene glycol, and the dispersion medium is nano-silicon dioxide particles.

8. The enclosed shear thickening fluid squeeze film damper of claim 1, wherein, ​

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