FI58011B - SAEKERHETSVENTIL FOER SLUTNA UTRYMMEN - Google Patents

Description

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Austria-Austria (AT) A U583 / 73 (71) Hoerbiger Ventilverke Aktiengesellschaft, Braunhubergasse 23, Vienna XI, Austria-Austria (AT) (72) Hans Hrabal, Vienna, Manfred Kuntzl, Vienna, Karl Berger, Vienna, Austria-Austria (AT) (7 * 0 Berggren Oy Ab (5 * 0 Safety valve for enclosed spaces - Säkerhetsventil for slutna utrymmene

The invention relates to a safety valve for enclosed spaces, in particular for the protection of the crankcase of internal combustion rotors in explosions, in the valve spring.

Safety valves with such a structure are used to protect enclosed spaces where explosions may occur from damage or rupture due to the pressure of the explosion. In particular, such valves are installed in the crankcase walls of two-stroke diesel engines, especially in marine engines, in order to achieve a rapid pressure drop in the event of an oil mist explosion and to avoid dangerous overpressure. Other examples of use are gas tanks, larger gas pipelines and other spaces in which explosive substances are stored and in which flammable gases may be generated. Safety valves, which are highly demanded for safety reasons, are usually manufactured in special factories and subsequently installed in equipment to be protected, such as marine engines. Therefore, measures are needed right from the design to enable a quick and safe installation.

5801 1

In a known embodiment, the valve parts are connected to each other by a plurality of tie bolts screwed to the valve seat at one end and having a stop at one end for supporting a detent which is secured by nuts screwed onto the bolts. To install this valve on the crankcase wall of an internal combustion engine, separate screws are required which either pass through the valve seat from the outside and engage a nut thread attached to the crankcase wall or are screwed from the inside of the crankcase through its wall into the valve seat. In another known device, the retaining bolts holding the detent are further provided for attaching the safety valve to the crankcase wall. The end of the tie bolts is then extended and protrudes into the crankcase, where the fastening screws are screwed onto the ends of the tie bolts. Finally, it is also known to screw the connecting bolts through the valve seat inside the ring arranged inside the crankcase and thus fasten the valve seat to the crankcase wall.

In known embodiments, the installation of the safety valve is difficult and time consuming. The use of own fastening screws often does not have the necessary space, so these are arranged in awkward places and in most cases make it necessary to partially disassemble the valve during installation. Even when the tie bolts themselves are also used to fasten the valve to the crankcase wall, the valve can only be assembled after installation, in particular only then can the retainer be placed on top of the tie bolts and fastened to them. In various embodiments, installation work inside the crankcase is also necessary, which is time-consuming and, above all, on smaller machines, only possible when access to the interior is made possible by removing the safety valve shut-off plate.

The object of the invention is to facilitate the installation of such safety valves in the boundary wall of the space to be protected, whereby it is possible to fasten the pre-assembled valve quickly and securely from the outside to the boundary wall. The main features of the invention 3,581,011 will become apparent from the appended claims.

The purpose of the screw bolts is then only to secure the safety valve to the boundary wall of the space to be protected and to receive the thrust forces caused by the shutter-plate retainer when the valve opens. The task, keeping the retainer at the correct distance from the shutter-plate, is again performed by the spacers. Therefore, there is no need for any stepped tie bolts with a retaining nut at their outer end, but only simple screw bolts that support their base on the outside of the retainer and are "well on hand to install and remove the entire valve.

„The drawing shows an embodiment of a safety valve according to the invention in axial section.

In the exemplary embodiment, the safety valve consists of an annular valve seat 1, the passage opening of which is covered with a closing plate 2, which is against a sealing ring 3 embedded in the valve seat 1. The closing plate 2 is loaded by a conically threaded coil spring 4, which supports the baffle 5 formed as a guide plate for the outgoing gas. The retainer 5 is held by spacers 6 at a distance from the valve seat with recesses 7 for the ends of the spacers 6. Simple screw bolts 8 protrude through the intermediate sleeves 6, passing through the valve seat 1 from the smooth bores and provided with threads from the ends 9 projecting through the valve seat 1.

The valve is mounted on the boundary wall of the space to be protected, e.g. the crankcase wall of a diesel engine, simply by placing the valve on the boundary wall, around a safety opening made therein, and then screwing the bolts 8 into threaded bores at the edge of the wall Separate nuts for the screw bolts 8 can also be fastened in the boundary wall. The ends of the screw bolts 8 are freely on the outside of the retainer 5 and are therefore well accessible, so that the installation work can be carried out quickly and without difficulty with a simple screwdriver. The tightening of the screw bolts 58011 is also used to press the valve seat 1 against the delimiting wall of the space to be firmly protected by means of the intermediate sleeves 6 so that a proper sealing is guaranteed.

The valve seat 1 further has threaded bores 10 to which the retaining screws 11 are screwed, which on their grips 12 engage the retainer 5. The retaining screws 11 firmly tighten the spacer sleeves 6 between the valve seat 1 and the retainer 5 and thus hold the valve parts together even before installation. The ends 12 of the retaining screws 11 are also easily accessible on the outside of the valve, so that either in the assembly of the valve itself or when it is installed in the place of use, the screws or other fastening means can be fastened in an inaccessible place. Since when the valve opens the screw bolts 8 fully absorb the pushing forces caused by the closing plate 2 on the retainer and these are immediately anchored to the boundary wall of the space to be protected, the valve seat 1 is only relatively lightly loaded, so it can be formed thin accordingly. Thus, its manufacture becomes substantially simple. The safety valve thus also means a very simple structure due to its easy installation.