DE1761674A1 - Filters, especially for a fuel monitoring device - Google Patents

Description

The Bendix Corporation, Usher Building, Detroit, Michigan, USA

Filters, in particular for a fuel monitoring device

In most of today's refueling systems, fuel monitoring devices are arranged behind conventional filter water separators. In such systems, the fuel monitors typically operate for long periods of time without exposure to large amounts of pollution. During such normal operation, the pressure drop through the fuel monitoring device gradually builds up, and the melting elements are activated after a certain time interval, i.e. after six months, or when the pressure differential across the heating elements has reached a certain value, for example 1-1.4 kg / om ² reached, replaced. Under such conditions, the fuel monitoring devices hold back all or almost all of the solid and water components in the fuel flow therethrough.

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More recently, fuel monitors have been used in combination with filter / water separators in many plants has been used effectively with it. Even in such systems, if the fuel is of average quality, i.e. only contains relatively small amounts of water and solids, the melting elements have no difficulty in holding back and trapping the contaminants. With such systems However, certain operating conditions can occur which have the consequence that small amounts of water seep through between the layers forming the edge-like joined melting elements and flow to the outlet opening of the fuel monitoring device.

To prevent such leakage, an am 6/21/68 oe patent application of the same applicant, which was received at the patent office, describes a device in which a water-soluble partition cooperates with a valve member and the latter prevents the melt filter from sealingly as long as the amount of water in the fuel does not exceeds a given ratio.

The present invention represents an improvement on this device and is mainly characterized by that the water-soluble partition or intermediate wall is arranged on a perforated holding member, because the partition or> "Partition wall can withstand the required pressure.

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In the drawing, the invention is in one embodiment shown,

Figure 1 shows a fuel monitoring device in view, partly in section with a plurality of goods units according to the invention.

Figure 2 is a longitudinal section through a filter or a melting unit according to the invention on an enlarged scale and shows the shut-off valve in different positions.

A housing 10 of a fuel tank is provided with an inlet opening -12 and an outlet opening 14. A separation or partition wall 16 is fixed to the housing and separates this into a EinlaiBkammer 18 and a Auelaßkammer 20. A plurality of filter or melting units 22 is fixed to the intermediate wall 16 and is held by a holding plate 24 which ^v with the housing 10 is connected. The direction of flow through the tank is indicated by arrows.

Each filter or melting device 22, as shown in Figure 2, includes a metal tube 26 having a plurality of perforated inlet openings 28, which is a compressible, porous, tubular, edge-assembled filter element 30 surrounds, which consists of a plurality of mutually aligned and in mutual surface contact Disks.

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A nipple-like Kunstetoffendring 32, which with the one End of the tube is connected and sioh against the sine end of the Supports the filter element is provided with a valve seat 34 for receiving a valve member, which is generally denoted by 36 is designated. A perforated retaining disc 38 is at the other end of the tube and a cup-shaped end plate 40 with a Recess 42 and a sioh outwardly extending flange 44 at the upper end, the other end of the filter element

30 arranged. A preloaded spring 46 holds the filter element under the desired calibrated pretension. The valve member 36 is arranged within the recess 42 of the end plate and enclosed therein by a compliant lip 48 which extends from the end plate 40. The closed end of the end plate 40, which acts as a Rliokhalteglied, contains a A plurality of duroplastic holes 50. A water-soluble, membrane-like barrier 52 is held against the perforated back holding part of the end plate 40 by a barrier holder 54. This water * soluble, membrane-like barrier can be formed from any suitable material such as cellulosic polymer, which under the registered trademark "Dissolvo" is.

As can be seen from Fig. 2, the device consists of a Valve ball 36, a valve retainer end plate 44, a water soluble barrier 52, and a barrier retainer 54. Although the lower side of the valve ball the flow pressure within the Filter element 30 is exposed, prevents the water-soluble

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ORIGINAL

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Locks 52 as long as it is okay that the top of the Ball exposed to the flow pressure outside the filter element 30 is. Thus, the water-soluble barrier isolates the ball from the pressure differential present above the enamel element. The small holes or perforations 50 in the retaining portion of the valve retaining end plate 44 enable the barrier to be used as required Resists pressure. When the through the fusible element ' If the fuel flowing through contains water, the barrier either dissolves completely or it softens and breaks on the Parts where not supported by the endplate valve holder will. When the perforations become free, the full effect is effective Pressure differential across the fusible element on the valve ball 36 off. If at that moment the pressure differential is sufficiently large and the ball on the flexible lip 48 of the valve holder is pushed past, the ball is ejected, driven down into the bore of the fusible element and into the seat 34 of the melting nipple 32 wedged. This prevents any further flow through the outlet opening of the fusible element. On the other hand, if the existing pressure differential is not great enough to eject the ball, it will be held back, until an additional accumulation of solid and aqueous components through the disks of the fusible element 30 that Pressure differential increased to the predetermined actuation value. Until then, the passage of water and test components into the interior of the fusible element is through full circle contact between the ball and the lip 48 of the opening in the end of the

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Ventilriiokträgerendplatte 44 prevented.

Instead of a valve holder with a lip-like opening 48, which through the ball valve according to Tig. 2 needs to be expanded, a valve holder with stretchable plastic or metal fingers can also be used. Furthermore, according to FIG the water soluble barrier 52 held in place by a cap 54, which fits over the end of the valve holder 44. The lock can also be held in place by a retaining ring, which is shown in a recess is pressed in the valve holder. Another modified method of attaching the barrier 52 to the perforated support portion of the valve holder would be simple consist of gluing it in place.

209813/0455

Claims (7)

Β / ρ 634-9 21.6.68 B / We Claims Filter, in particular for a fuel monitoring device, which has a tubular housing with inlet and outlet openings, a tubular support element arranged in the housing to enable a flow flow through from the outside to the inside, one end of which is supported against the housing in alignment with the outlet opening, a valve which rests against the other end of the tubular element, closes the latter and contains a releasable valve member, one side of which is in communication with the inside of the flow of the tubular element, and has locking means which are connected to the valve and prevent that the other side of the valve member can come into communication with the fluid outside of the tubular element, except when the fluid contains water constituents, and the valve member cooperates with the tubular element and the outlet opening so that when the differential pressure across it ü rises above a certain value, the valve member is released and moves from the end of the tubular element into the outlet opening and prevents further flow, the barrier containing a water-soluble membrane which is in a solid state in which it is prevented that the other side of the valve member comes into communication with the flow medium outside the tubular element and is in a second disengaged state to enable such a connection, characterized in that the filter (22) furthermore has a 209813 / CH55 Β / ρ 6349 6/21/68 B / * e Support member (40) with perforations near the membrane (52) so that the membrane can withstand the required pressure. , 2. Filter according to claim 1, characterized in that the support member (40) consists of a cup-shaped end plate in support with the other end of the tubular member (30), and the end plate (40) with a recess (42) for receiving the Valve member (36) and with means (48) is provided to the To hold the valve member within the recess (42) as long as the differential pressure via the valve member (36) is below the certain value. 3. Filter according to claim 2, characterized in that there is means (54) for holding the membrane (52) against the support member (40). 4. Filter according to claim 3 «characterized in that these means (54), a holding member (54) in contact with the membrane (52) and a preloaded spring (46) to urge the retaining member (54) against the support member (40). 5 «Filter according to claim 3», characterized in that the means (54) contain an adhesive material which is arranged between the membrane (52) and the support member (40). 6. Filter according to claim 3, characterized in that the means 209813/0455 BATH ORIGINAL Β / ρ 6349 6/21/68 Β / β for holding the valve member (36) within the recesses (42) have a resilient lip (43). 7. filter naoh claim 6, characterized in that the valve * member consists of a ball (36). 6. filter naoh claim 7, characterized in that the means' have flexible fingers to hold the valve member (36) within the recess (42) 209813/0455 Blank page