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Loop flushing systems for hydrostatic equipment

A hydrostatic and equipment technology, applied in the field of hydraulic loop flushing devices, can solve the problems that imply that the hydraulic system is damaged, hinder the optimal cooling of movable parts, and cannot establish a constant flushing flow, etc., and achieve the reduction in size and size Effect

Active Publication Date: 2019-03-01
DANFOSS POWER SOLUTIONS GMBH & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This oscillating opening and closing of the flush valve produces / causes a noise that is suggestive of damage in the hydraulic system
Furthermore, these oscillations may also hinder effective and / or optimal cooling of the hydraulic fluid and the movable parts of the hydraulic system, since a controlled constant flushing flow cannot be established
These oscillations are carried further back into the low pressure line, potentially causing more distress

Method used

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  • Loop flushing systems for hydrostatic equipment
  • Loop flushing systems for hydrostatic equipment
  • Loop flushing systems for hydrostatic equipment

Examples

Experimental program
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Effect test

Embodiment Construction

[0035] figure 1 A circuit diagram of a loop flushing system known from the prior art, for example the loop flushing system taught in US 6,430,923 B1, is schematically shown. In this system, each working line 2 and 3 of the hydrostatic propulsion system is led to one of the sensing diameters 25 or 26 of the shuttle valve spool 22 of the shuttle valve 20 . If the pressure difference between the high pressure side and the low pressure side produces a pressure on one of the sensing diameters 25 or 26 that is higher than the force of the shuttle valve spring 24 arranged on the opposite sensing diameter 26 or 25, the shuttle valve The spool 22 is moved so that the fluid connection to the passage 29 is opened for one of the inlet ports 5 or 6 (inlet port for low pressure). The fluid pressure generated in passage 29 in this manner is used to generate a cracking pressure against the force of flush valve spring 14 on sensing surface 18 of flush valve cartridge 12 of flush valve 10 . T...

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PUM

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Abstract

A hydraulic fluid loop flushing device for hydrostatic equipment comprising a valve housing having a cylindrical valve bore with a high pressure inlet, a low pressure inlet and a discharge outlet. The first flushing valve spool is arranged elastically preloaded in the valve bore for enabling a fluid connection between the low-pressure inlet and the discharge outlet by means of the first fluid passage. In addition, the shuttle valve spool is arranged elastically preloaded in the valve bore for further enabling a fluid connection between the low pressure inlet and the discharge outlet by means of a fluid passage. To this end, the first flush valve spool and the shuttle valve spool are concentrically arranged and movable relative to each other, and the fluid connection between the low-pressure inlet and the discharge outlet is only when the first flush valve spool and the shuttle valve spool are in their respective positions. Only turns on when the position is turned on.

Description

technical field [0001] The invention relates to a hydraulic circuit flushing device for hydrostatic equipment according to the body of claim 1 . The invention also relates to hydraulic equipment using such a circuit flushing device. Background technique [0002] Hydraulic fluid for generating hydraulic pressure and hydraulic performance in hydraulic machines having a closed circuit for the hydraulic fluid, such as hydrostatic drive or propulsion systems, especially in hydrostatic machines, such as hydrostatic pumps and hydrostatic motors are subjected to elevated temperatures during operation of the machine or plant, respectively. Additionally, during operation, the movable parts of hydrostatic equipment, such as supports, bearings, guide shoes, etc., require lubrication to function properly and prevent overheating. Such lubrication and protection against overheating is usually performed by a loop flushing system that produces - in addition to the inevitable leakage of val...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B13/042F16H61/4104F15B21/04F15B21/0423F15B21/045
CPCF15B13/042F16H61/4104F15B7/006F15B13/024F15B2211/20561F15B2211/20569F15B2211/27F15B2211/3052F15B2211/31558F15B2211/50518F15B2211/5159F15B2211/611F15B2211/62F15B21/005F15B21/045F15B21/04F15B21/0423F16H61/4165
Inventor 安·斯特布劳
Owner DANFOSS POWER SOLUTIONS GMBH & CO
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