Experimental study on thermal deformation and clamping force characteristics of hydraulic spool valve

Chen, Qianpeng; Hong, Jung-Pyo; Xing, Huihui; Zhao, Hongke

doi:10.1016/j.engfailanal.2021.105698

Cited by 8 publications

(3 citation statements)

References 19 publications

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“…Furthermore, Guardino et al [12] investigated the diference in various values of the roughness amplitude to the clearance flm ratio and pointed out that the diference increases with the ratio. In the following years, some research results [13][14][15][16][17][18] used in hydrostatic gas-lubricated tribological components obtained the same results as those in reference [12]. Simultaneously, the research methods based on the NS equation are applicable to the study of the clearance flm lubrication between the sleeve and the spool as the depth of the groove to the thickness of the clearance flm ratio is greater than ten [19,20].…”

Section: Introductionmentioning

confidence: 64%

An Accurate Mathematical Model and Experimental Research of Pressure Distribution in the Spool Valve Clearance Film

Chen

Yang

2022

Mathematical Problems in Engineering

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As an actuator control element of the electrohydraulic system in aerospace, airplanes, and other equipment, the spool valve is prone to the “hydraulic lock” problem, which may cause major accidents of these electrohydraulic systems. The grooves engraved on the spool can effectively eliminate this problem by migrating the uneven pressure distribution in the clearance film between the sleeve and the spool. The effect of migrating uneven pressure distribution depends on the groove parameters. This paper proposed an accurate mathematical model with rectangular grooves to investigate the effect. Unlike previous mathematical models based on the Reynolds equation, the proposed model is based on the Navier–Stokes equation, which is more valid in the range where the clearance film thickness is much less than the groove depth. Meanwhile, the mathematical model takes the distributions, width, depth, and the number of grooves into consideration. Then, the proposed mathematical model was used to investigate the effects of mitigating the uneven pressure distribution under various parameters of grooves. To verify the accuracy of the mathematical model, the volume flow leakage in the clearance film obtained by the proposed model and the Reynolds equation, respectively, is compared with that obtained by the experimental test. The comparison results indicate that the results obtained by the Reynolds equation could reach a maximum of 14.75% different from the experimental results, while the results obtained by the NS equation are only 5.57% different under the same conditions, implying that the mathematical model derived from the NS equation is more accurate.

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Section: Introductionmentioning

confidence: 64%

An Accurate Mathematical Model and Experimental Research of Pressure Distribution in the Spool Valve Clearance Film

Chen

Yang

2022

Mathematical Problems in Engineering

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“…Thermal deformation and solid particles can also affect the hydraulic clamping force. Chen et al [37,38] measured the temperature of slide valve cores with K, U, and V throttling slots using the in situ measurement method of temperature distribution embedded with micro-thermocouples. They found that a smaller valve opening results in a large temperature gradient in spool valves, and as the spool valve opening or pressure difference increases, the local high-temperature zone on the throttling edge gradually expands.…”

Section: Radial Flow Forcementioning

confidence: 99%

Review of the Research on and Optimization of the Flow Force of Hydraulic Spool Valves

Sun

et al. 2023

Processes

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As one of the important factors affecting the stability of slide valves, the analysis and research of flow force are of great significance. In recent years, more and more experts and scholars have conducted research in this field, attempting to find methods to reduce or utilize the flow force of hydraulic spool valves. Flow force includes steady-state flow force and transient flow force, with steady-state flow force having the most significant impact on spool valves. The influencing factors of flow force are complex and diverse, including the cavitation phenomenon, shape of the throttling groove, and jet angle. At present, the main ways to reduce flow force are to design the structure of the spool valve, the structure of the valve sleeve, and the flow channel of the valve body. This article mainly reviews the definition, calculation methods, influencing factors, and methods for reducing the flow force of slide valves. This provides a new approach to reducing the flow force in hydraulic spool valves.

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“…The high costs of servo-valves compared to proportional valves are substantially related to their higher precision [2]. The diameter clearances of spool valves are in the range of 4 to 20 µm [3], depending on the spool diameter, valve overlap and valve type. The leakage increases with the third power of clearance and is inversely proportional to the gap length.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Analysis of a Non Contacting Elastohydrodynamic Sealing

Scherrer

Scheidl

2023

TJFP

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This paper presents a novel elastohydrodynamic sealing concept for the contactless sealing of spool valves. The basic goal is that the spool and the sleeve can be manufactured with standard mechanical engineering precision. High initial gaps are compensated for the elastic deformation of an elastomer seal driven by a self-regulating hydrodynamic effect. The final gap reveals a small leakage within the range normal for precisely manufactured spool valves and also features a low friction since a direct, solid contact between the seal and the sleeve is prevented. This sought-after behavior in ideal conditions is compared with imperfect situations by means of a simulation study and experiments. The simulation uses a Finite Element model which takes the seal‘s elastic deformation, the mechanical contact, the sealing gap pressure and the surface roughness into account. A simple prototype of the sealing system was produced to test its functionality in real conditions. Leakages of QLeak <= 18 ml/min @180 bar were recorded. However, an unexpectedly high friction occurred indicating an actual contact between the seal and the sleeve. The component roughness was identified as the cause of this behavior.

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Experimental study on thermal deformation and clamping force characteristics of hydraulic spool valve

Cited by 8 publications

References 19 publications

An Accurate Mathematical Model and Experimental Research of Pressure Distribution in the Spool Valve Clearance Film

An Accurate Mathematical Model and Experimental Research of Pressure Distribution in the Spool Valve Clearance Film

Review of the Research on and Optimization of the Flow Force of Hydraulic Spool Valves

Theoretical and Experimental Analysis of a Non Contacting Elastohydrodynamic Sealing

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