Pilot operated relief valve, hydraulic system and working machine
CN224693675UActive Publication Date: 2026-08-28ZOOMLION HEAVY INDUSTRY SCIENCE AND TECHNOLOGY CO LTD +1
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Patent Information
- Application Number
- CN202521893222.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-03
- Publication Date
- 2026-08-28
- Estimated Expiration
- 2035-09-03
AI Technical Summary
Technical Problem
[0004]针对上述的缺陷或不足，本实用新型提供了一种溢流阀、液压系统及作业机械，旨在解决现有的溢流阀在使用时噪音现象明显的技术问题
Benefits of technology
当进油口的压力超过设定值时，阀芯会克服先导弹簧端的作用力并朝导通阀位移动。由于阀芯上设有凸起遮蔽结构，当阀芯移动至导通阀位时，凸起遮蔽结构会部分遮蔽回油口，使得回油口因节流而降低液压油的流速，进而减轻了液压油因高速射流对阀体的冲击振动与噪音；同时，凸起遮蔽结构还能够对回油口处的液压油分散导流，避免了油液高速集中汇聚，有效抑制空穴现象的产生，降低流体噪音；另外，回油节流油道节流产生的回油背压可延缓阀芯的运动速度，使其启闭动作更平稳，从而缓解阀芯的频繁启闭现象。
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Figure CN224693675U_ABST
Abstract
The utility model belongs to hydraulic technology field and provide a kind of overflow valve, hydraulic system and operating machine, and overflow valve includes valve sleeve and valve core.Valve sleeve is equipped with hollow channel and the oil inlet and oil return port communicated with hollow channel respectively, valve core is movably arranged in hollow channel and axial one end is pilot spring end, pilot spring end is controlled by spring force and hydraulic pressure jointly, pilot spring end is used to control the on-off between oil inlet and oil return port, still be equipped with convex sheltering structure on valve core, when overflow valve is in conduction valve position, convex sheltering structure part shelters oil return port and forms oil return throttling oil passage between the inner wall of oil return port.This overflow valve controls oil return throttling oil passage, thereby reduce the opening noise of overflow valve, increase the opening stability of overflow valve.
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