CN214221866U - Intelligent damping hole - Google Patents

Abstract

The utility model relates to an intelligence damping hole. It is mainly composed of graphene layers and polymer layers. In the hydraulic damping system, when the vibration frequency is too high or the working time is too long, the temperature of the oil liquid rises and the viscosity of the oil liquid falls, and meanwhile, the heated aperture of the damping hole is enlarged, so that the output damping force is influenced. The intelligent damping hole can automatically adjust the aperture to be reduced when the viscosity of oil is reduced, and then the damping force is stably output. The working principle is as follows: the thermal expansion coefficient of the graphene is negative, and the heated shrinkage aperture is reduced; the polymer layer has positive thermal expansion coefficient, and the graphene layer is thermally expanded due to effective heat transfer so as to avoid stress between the graphene layer and the outer wall and maintain the structural stability. Under the condition that the thickness of the graphene layer is larger than the thickness of the polymer layer, the aperture of the intelligent damping hole is reduced along with temperature rise, so that the stability of the output damping force of the system is kept. The utility model provides a damping force decline or sudden change problem that fluid high temperature brought, use intelligent material, simple structure, stable performance.

Description

Intelligent damping hole

Technical Field

The utility model relates to an intelligence damping hole can automatically regulated aperture in hydraulic damping system during operation, guarantees that the damping force is not suddenly dropped when especially fluid high temperature, exports stable damping force. Belongs to the field of hydraulic vibration reduction and intelligent structures.

Background

The damping hole is generally applied to a hydraulic system, and the small damping hole plays different roles in different occasions: stabilizing pressure, slowing shock, delaying response and the like, and plays a role in providing pressure difference and damping in the hydraulic damping system. This is often the case in general damping systems in applications: external vibration frequency is too high, or operating time overlength leads to fluid temperature to rise, and fluid viscosity descends thereupon to output damping force can descend, and the damping hole expend with heat and contract with cold makes the aperture grow this moment, can increase the range that damping force descends, consequently when operating environment leads to fluid viscosity to change, damping force also can sudden change if the slump, the damping effect variation of system. The utility model mainly relates to two kinds of intelligent materials: 1. the graphene material is found to have great influence on application research in many fields, has excellent mechanical property, electric conductivity, photo-thermal and electric-thermal conversion performance, extremely high thermal stability and excellent heat conduction performance, and has the heat conductivity reaching 5000W/m.K at room temperature. Due to the unique properties of the graphene materials, the graphene materials can be used as energy conversion elements to convert external stimuli such as electric energy, light and heat into mechanical deformation. Most importantly, graphene has a unique negative thermal expansion coefficient, and shows thermal shrinkage performance over a relatively wide temperature range. This characteristic is a key factor in implementing this intelligent damper by structural assembly. In addition, firstly, the corrugated micro-cavity in the reduced graphene oxide with the spongy fluffy structure is filled with gas and serves as a micro air bag, so that the micro air bag can generate thermal contraction to a greater extent than that of graphene, the contraction coefficient can reach-1.2E-4/DEG C, and the micro air bag is more suitable for being used as an inner layer of the damping hole. The high molecular polymer material mainly has the following characteristics: has a large positive thermal expansion coefficient, such as that of Polyimide (Polyimide) of about 1.7-3.0E-5/DEG C; high temperature resistance and high thermal stability, for example, polyimide is the highest polymer with thermal stability at present, the thermal decomposition temperature can reach about 600 ℃, the severe environment of 269 ℃ below zero can be resisted, and the stable performance is kept; other advantages are good mechanical property, light weight, easy processing and low cost. The utility model uses high molecular polymer material (such as polyimide PI, 2.8E-5/° C) as the outer layer of the intelligent damping hole; the reduced graphene oxide film (linear expansion coefficient-1.2E-4/DEG C) is selected as an inner layer, and the mechanical deformation of the whole damping hole is induced by utilizing the thermal shrinkage and cold expansion properties and excellent heat conduction property of the inner layer, so that the intelligent control is realized. At present, the double-layer structure is more used in the field of intelligent driving, and carbon nano materials and polymer materials are assembled to form a double-layer structure, wherein the carbon nano materials are used as energy conversion elements, and the polymer is used as a structural element, so that external electric energy, light energy and the like can be converted into mechanical energy to be output. But the field of taking the damping structure as an intelligent damping structure is still rarely researched. After finite element simulation is carried out on the intelligent damping hole structure, the fact that the function that the hole diameter is reduced along with temperature rise can be achieved when the ratio of the inner layer to the outer layer is larger than 1 and the relation between the hole diameter and the wall thickness is smaller than 3/4 on the basis of the expansion coefficient material is found. And the relationship between the pore size change and the sum of the thicknesses of the two layers of materials is as follows: the temperature rise aperture change degree is increased along with the increase of the sum of the thicknesses; the relationship between the pore size change and the thickness ratio of the two layers is: also the degree of pore size change increases with increasing ratio of inner and outer layer thickness. The utility model discloses can realize self-coupling intelligent control, need not any outside energy supply, consequently be fit for the self-adaptation control field that is used for hydraulic damping system.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an intelligence damping hole, it has characteristics such as simple structure, stable performance, stress minimum, self coupling and control. The intelligent damping hole is applied to a hydraulic system, when the temperature of oil is higher, the inner layer material has heat shrinkage performance, and the heat quantity stimulates the whole inner layer to generate mechanical shrinkage. Meanwhile, because the inner layer material has extremely high thermal conductivity and the two layers have good interface contact, on the basis of ensuring sealing, heat is effectively transferred to the outer layer of the polymer material to cause thermal expansion of the polymer material, so that stress between the polymer material and the outer wall is avoided, the structure is stable, and under a certain size, the aperture of the intelligent damping hole is reduced, thereby achieving the purpose of keeping the output damping force of the system stable. The utility model provides an in hydraulic pressure damping system because fluid high temperature, fluid viscosity descends and ordinary circulation hole material expend with heat and contract with cold simultaneously leads to the aperture grow to the damping force that brings descends or sudden change problem, uses intelligent material, simple structure, stable performance. Because the two materials have opposite thermal expansion coefficients, the stress between the two materials and the outer wall is avoided, and the structure is stable.

Drawings

Fig. 1 is a front sectional view of an intelligent damping hole according to the present invention. The components and numbers in fig. 1 are:

1. SRGO layer 2.PI layer

Fig. 2 is a front sectional view of a dual-tube shock absorber, which is an application scenario example for explaining the operation principle and process of the present invention. The components and numbers in fig. 2 are:

3. dust cover 4, through hole 5, intelligent damping hole 6, working cylinder 7, piston 8, through valve 9, expansion valve 10, compression valve 11 and compensation valve

Detailed Description

The purpose of the utility model is realized like this: the structure of the utility model is shown in figure 1. It comprises two-layer intelligent material, and the inlayer is for having the graphene oxide layer that spongy bulky structure reduces, SRGO layer 1 promptly, and the outer polymer polyimide layer that is, PI layer 2, two-layer material bond together through the chemistry, and strict sealing prevents that fluid from revealing between two-layer. Will the utility model discloses be fixed in valve opening or wall hole structure as the damping hole of circulation fluid, give an application scene example: for example, the flow hole 4 of the simple dual tube shock absorber shown in fig. 2 is chemically connected and fixed with an intelligent damping hole on the hole wall. Inner SRGO layer 1 is heated the shrink, and the aperture diminishes, and outer PI layer 2 receives the environment and graphene heating influence and expands, reduces the stress influence to the pore wall of connecting intelligent damping hole, plays stable structure's effect. The thickness ratio of the inner layer and the outer layer of the intelligent damping hole is larger than 1, the ratio of the inner diameter of the hole to the wall thickness of the hole is smaller than 3/4, and when the shock absorber works in the size, the temperature of oil flowing through the circulation hole 4 is increased, the aperture of the intelligent damping hole is reduced, and the damping caused by the reduction of viscosity due to the temperature increase can be effectively prevented from being reduced.

The working principle of the two layers of materials of the intelligent damping hole is as follows: the SRGO layer 1 and the PI layer 2 are assembled to form a double-layer annular structure, and fixed to a valve hole or a wall hole structure as a damping hole for passing oil, for example, a pass hole 4 and a compensation valve 11 of a simple dual-tube shock absorber shown in fig. 2, and an intelligent damping hole is chemically connected and fixed to a hole wall thereof. The SRGO layer 1 shows that the self-shrinkage pore diameter is reduced due to the special heat shrinkage performance of the SRGO layer, namely, the SRGO layer is stimulated by oil heat; and the graphene material has extremely high thermal conductivity, and can effectively transfer heat to the outer layer. The PI layer 2 absorbs heat generated by the SRGO layer 1 through good interface contact to realize thermal expansion deformation, and the stress of the whole structure on the wall of the vibration absorber cylinder is eliminated. And the inner layer and the outer layer are tightly bonded, so that the sealing is good, and the oil is prevented from damaging the double-layer structure, leaking and the like. The thermal expansion deformation degree generated by the polymer is smaller than that generated by the graphene, and in order to ensure that the deformation trend of the whole structure is consistent with that of the inner layer, the ratio of the thickness of the SRGO layer 1 to the thickness of the PI layer 2 is required to be larger than 1.

The working principle of the intelligent damping hole is as follows: when the external vibration frequency is higher or the working time is overlong and other factors cause the temperature of the oil to be high and the viscosity to be reduced, the SRGO layer 1 enables the whole inner layer to shrink under the action of heat generated by the oil. Meanwhile, due to the high thermal conductivity and good interface contact of the inner layer material, heat is effectively transferred to the PI layer 2 to cause thermal expansion of the PI layer, so that stress between the PI layer and the outer wall is avoided, the structure is stable, and the aperture of the intelligent damping hole is reduced at a certain size; on the contrary, when the external vibration frequency is low, the viscosity of the oil is not obviously reduced, the aperture of the intelligent damping hole is adjusted accordingly, the contraction effect is not obvious, and the fluctuation of the damping force output is not obvious. The intelligent damping hole takes the working environment temperature as a stimulus source, so that the intelligent damping hole can solve the problems of oil viscosity reduction and damping force sudden drop mutation caused by vibration frequency or long-time work, and the purpose of keeping the output damping force of the system stable is achieved.

Claims (3)

1. An intelligent damping hole is composed of two layers of intelligent materials, wherein the inner layer is a graphene layer, the outer layer is a polymer layer, the two layers of materials are chemically bonded together, the graphene inner layer has a negative thermal expansion coefficient, the polymer material outer layer has a positive thermal expansion coefficient, the two materials have opposite thermal expansion coefficients, stress between the two materials and the outer wall is avoided, and the structure is stable; the intelligent damping hole is characterized in that the inner graphene layer is heated and shrunk, the hole diameter is reduced, heat is effectively transferred to the outer polymer material layer to induce thermal expansion, stress influence on a hole wall connected with the intelligent damping hole is reduced, the change trend of the whole structure is that the vibration frequency is higher, the oil temperature is higher, and the whole hole diameter is smaller, so that the intelligent regulation of the hole diameter can be carried out by coupling the environment temperature, and damping is stably output.

2. The intelligent damping hole of claim 1, wherein the inner and outer layers of holes are chemically bonded, the two layers of materials are in good contact and tightly sealed, and the outermost layer is connected with the hole wall for use.

3. The intelligent damping hole of claim 1, wherein the ratio of the thickness of the inner layer to the thickness of the outer layer is greater than 1, i.e. the thickness of the inner layer is greater than the thickness of the outer layer, and the proportional relationship between the sum of the thickness of the inner layer and the thickness of the outer layer and the aperture satisfies the rule that the aperture becomes smaller when the temperature rises.

Images