Self-cleaning filter system for high-pressure systems

Abstract

Self-cleaning filter device for high-pressure systems, characterized in that it has an integrated cleaning unit which is automatically activated during pressure peaks, pressure drops or periodic cleaning pulses in order to loosen, remove or dislodge accumulated particles, dirt or residues from the filter zone. to divert, whereby the system for liquid and / or gaseous media at operating pressures of at least 100 bar, especially up to over 700 bar, enabling continuous flow without manual cleaning.

Description

[0001] The present invention relates to a self-cleaning filter system for high-pressure lines, particularly in hydraulic applications of construction machinery, agricultural equipment, and stationary systems. The aim is to extend the service life of hydraulic systems, prevent failures due to contamination, and simultaneously significantly reduce maintenance requirements.

[0002] Hydraulic systems operate under extreme conditions at pressures exceeding 400 bar. Even the smallest particles of dirt in the oil circuit can cause significant damage to pumps, valves, or lines. Previously used return or pressure filters require regular manual replacement or cleaning. This results in downtime, high maintenance costs, and the risk of missed maintenance intervals. This system is specifically designed for use in high-pressure lines operating with hydraulic, pneumatic, water-based, or other pressurized fluids. It is ideally suited for applications with operating pressures starting at approximately 100 bar, preferably above 250 bar, and in extended versions can also be used at operating pressures exceeding 400 bar.

[0003] The invention provides a solution through a compact, self-cleaning filter system that can be integrated into high-pressure circuits. The system combines the following features: 1. Automatic self-cleaning – An integrated mechanism periodically or as needed removes adhering particles from the filter element. This can be achieved through backwashing, mechanical wiping, or a combination of both. 2. High pressure resistance – The filter body and functional units are designed to operate reliably even at pressures exceeding 400 bar. This makes the system suitable for high-pressure hydraulics, where conventional filter solutions quickly reach their limits. 3. Continuous operation – Cleaning takes place without a complete interruption of operation. This protects the oil circuit while the system automatically removes residues or collects them in a collection chamber. 4. Universal application – The filter system has a modular design and can be integrated into both return and pressure lines. This makes it suitable for a wide range of machines and applications.

[0004] The particular advantage of the invention lies in the fact that, unlike existing systems, it does not merely provide for manual maintenance or subsequent replacement, but rather represents a permanent, integrated solution. This reduces unplanned downtime, increases machine safety, and improves cost-effectiveness through fewer spare parts and less downtime.

[0005] The invention thus makes a crucial contribution to increasing operational safety in high-pressure hydraulic systems and represents an innovative advancement over the state of the art.

Claims

[1] Self-cleaning filter device for high-pressure systems,- characterized by that it has an integrated cleaning unit which is automatically activated during pressure peaks, pressure drops or periodic cleaning pulses to loosen, remove or dislodge accumulated particles, dirt or residues from the filter zone to divert, whereby the system for liquid and / or gaseous media at operating pressures of at least 100 bar, especially up to over 700 bar, enabling continuous flow without manual cleaning. [2] Filter device according to claim 1, characterized by , that the cleaning mechanism is implemented by means of a backflow or backwash line, which briefly generates a counter-current flow to remove accumulated particles. [3] Filter device according to one of the preceding claims, characterized bythat a return channel is provided through which removed particles are returned to a collection container or to the main tank. [4] Filter device according to any one of the preceding claims, characterized by that the cleaning activation is triggered by pressure sensors, flow sensors or a combined sensor unit. [5] Filter device according to claim 4, characterized by that the sensor detects a pressure change of at least 5% and thereby triggers the automatic cleaning pulse. [6] Filter device according to any one of the preceding claims, characterized by that the filter unit has a modular design and contains replaceable filter elements or sieve modules. [7] Filter device according to any one of the preceding claims, characterized by that it can be integrated as an inline system into existing cable runs. [8] Filter device according to any one of the preceding claims, characterized by, that the cleaning unit is automatically activated by the system pressure, without an external energy source. [9] Filter device according to any one of the preceding claims, characterized by , that a manually triggered cleaning mechanism is also provided. [10] Filter device according to any one of the preceding claims, characterized by that the filter unit is made of high-pressure resistant stainless steel, hardened aluminum or composite material. [11] Filter device according to any one of the preceding claims, characterized by that it is designed for media such as hydraulic oil, water, emulsions, air, gas or mixed media. [12] Filter device according to any one of the preceding claims, characterized by that a backwash cycle is completed in less than 1 second. [13] Filter device according to one of the preceding claims, characterized bythat the backwashing or cleaning direction is switched via a valve control. [14] Filter device according to any one of the preceding claims, characterized by that the valve control is mechanically, pneumatically or hydraulically actuated. [15] Filter device according to any one of the preceding claims, characterized by that the system has a feedback function to a control unit or a display unit. [16] Filter device according to claim 15, characterized by that the control unit allows for automatic adjustment of the cleaning intervals. [17] Filter device according to one of the preceding claims, characterized by that an overpressure valve is integrated, which limits the maximum pressure before the filter unit. [18] Filter device according to any one of the preceding claims, characterized by that it has a self-venting unit to prevent gas bubbles or cavitation. [19] Filter device according to any one of the preceding claims, characterized by that it performs an automatic backwash sequence when the system starts or stops. [20] Filter device according to any one of the preceding claims, characterized by that the cleaning frequency is adaptively adjusted to the degree of soiling. [21] Filter device according to any one of the preceding claims, characterized by that the system is connected to a heat exchanger or pressure vessel via a return line. [22] Filter device according to one of the preceding claims, characterized by that it is designed as a disposable, reusable or permanent filter variant. [23] Filter device according to one of the preceding claims, characterized by that the cleaning unit performs a helical or rotating movement to remove particles. [24] Filter device according to one of the preceding claims, characterized bythat a recoil chamber is provided which is periodically filled and emptied via the system pressure. [25] Filter device according to any one of the preceding claims, characterized by that the system is vibration-resistant and suitable for mobile machinery. [26] Filter device according to one of the preceding claims, characterized by that it is designed for temperatures between -30 °C and +120 °C. [27] Filter device according to any one of the preceding claims, characterized by that the backwash flow is regulated by a one-way valve. [28] Filter device according to one of the preceding claims, characterized by that the return flow is via a pipe which is emptied via a drain system or a separator. [29] Filter device according to any one of the preceding claims, characterized by that it can be combined modularly with pumps, sensors or valves. [30] Filter device according to any one of the preceding claims, characterized by that it can be used in stationary and mobile systems, especially in agricultural, construction, industrial, automotive, marine and aviation technology. [31] Filter device according to one of the preceding claims, characterized by that it is low-maintenance, energy self-sufficient and designed for continuous use in closed high-pressure circuits.