DE9004460U1 - Filter cartridge anti-theft device - Google Patents

Description

Description Filter cartridge anti-theft device Lr hydraulically operated fascias «ad systems fc^

usually to prevent malfunctions and to reduce wear and tear, which is important for keeping the hydraulic fluids clean.

To ensure that the filters function properly, they are often used as contamination indicators

Equipped with a necessary replacement of the

ti «««ate £o _% H«ier*—

Unfortunately, it now happens very quickly _that the staff who work all shifts miss the changeover signal and are unable to finish their shift without disruption.

Used «at any time*, »~-«;printed pressure filters,

which can withstand the operating pressure of the system even when completely overloaded is ensured by the all-metal

Add 4es Bleach the system iaster slowly until In extreme cases no function can be operated very smoothly.

Without the use of return filters, the degree of contamination is monitored by a pressure switch valve. And when a certain value is reached, a hydraulic switching function prevents pressure build-up in the storage area and thus forces a change of the filter element*

Unfortunately, it is a common practice for the operating personnel to simply remove the filter element and continue without filtering.

As a rule, the next shift does not know anything about this and also operates without filtering, so that the systems are operated for days and weeks without filtering, leading to the failure of expensive pumps, valves and heaters.

Disadvantages of a previous use (see &bgr;&bgr;&bgr;&idiagr;&Ogr;529·6) using a flow-through shut-off valve are the increased flow resistance through the valve, which has particularly detrimental effects on return filters. Furthermore, this design tends to cause the valve to jam _because dirt particles get stuck in the valve gap and it therefore no longer functions. In addition, this valve design is much more complex and expensive than the present invention.

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The entire valve can _also be easily removed by unscrewing it.

The object of the invention is therefore to create a gate device which can be operated safely without filtering.

This task _is solved by the filter element Ib in the installed state closing a control line "X",

If the filter element is removed, the outlet line "X" is opened.

With appropriate maintenance of the hydraulic system.) (e.g. switchgear Fig. 5, 6 and 7), further operation of the system is prevented until a new filter element is inserted, which is located in a filter element container installed in the system as shown in Fig. 8.

The invention is explained below using purely serious drawings with various exemplary embodiments. It shows:

Fig. 1 A schematic sectional view in which a filter bowl 3 is screwed into a filter head 1 and fixes a filter element 3 which is placed on a pin 7 provided in the filter head and is provided with a seal β. At the same time as the filter element 3, a bolt 4 fastened to the element is inserted into a bore which has a seal 5 and at the same time forms the control connection "X". When the filter element is removed, the control connection "X ¹ * is opened.

rig. a A schematic sectional view similar to Fig. 1, but here a hole 6 provided in the filter element base Sl with the seal 5 delivers a piece of pipe β which is fastened in the filter head 1 and forms the control connection "X". When the element is removed, the connection "X" is opened.

fig. 3 An acheamatic sectional division similar to Fig. 1, however the filter element is provided with two seals 8 which close the bore or annular gap 13 when installed. This bore forms the control connection ^N X ^M which is open when the filter element is removed.

Fig. 4 Differing from Fig· 3 in that the

Element 3 is not placed on a pin, but is inserted into a hole 14.

Examples »of hydraulic shading

Fig. 5 A pressure filter connected downstream of a hydraulic pump according to the present invention has a line to the tank at the control connection "X". Thus, when the filter element is removed, no useful pressure build-up takes place in order to operate the system.

Fig. 6 Here, the control flange "X" of the filter according to the invention is connected to the control circuit of a control pump. When the filter element is removed, the control oil of the pump flows out and prevents the regulator from swinging out and thus the system from operating.

Fig. 7 See in Fig.6 ■ However, a return filter according to the invention is provided here.

Claims (1)

Walter Schmidt Viesbacher Str. 19 A 6688 Ul Ingen 2 Pi lterpatronan-Entwendoachutg- Device Schutzsansprttche 1. Device for filtering hydraulic fluids ■with a replaceable filter element, characterized in that the filter element (3) closes a bore (6) or annular gap (13). S. Device according to claim 1, characterized in that the filter element (3) is plugged or screwed on and, when removed, opens a bore (6) or an annular gap (13). 3· Device according to claim 1 and 2 « characterized in that the bore (6) or the annular gap (13) is provided with a connection which serves as a control line and, through suitable wiring in a hydraulic circuit, allows control oil to flow both into and out of the filter.