US1166855A - Safety device against explosions in the air-pipes of internal-combustion engines. - Google Patents

Description

c. c. REGENBOGEN & P. A. m. SAFETY DVICE AGAINST EXPLOSIONS IN THE AIR PIPES OF INTERNAL COMBUSTION ENGINES.

APPLICATION FIL ED SEPT. 19/1914.

Patentei Ja11.4, 1916.

connan c. nnennnoenn, or KIELGAARDEN, AND rain. a. BITTER, ceman can .MANY, .ASSIGNORS T FRIED- imuer ax'rrnnonsnmscnarg onanmwnnr'r,

OF KIEL-GAABDEN, GERMANY.

- 'SAFETYQDIEVICE AGAINST ii xrno's rons In mnn Jim-runs or mranconnps'rron I ENGINES.

Specification of Letters Patent. Patented J 1916.

Application filed September 19, 1914, Serial No. 862,618.

i To all whom'z't aaayconce'm:

room: and PAUL A. Rrrrnn, citizens of the Be it known that we, Conn'An O Recen- German Empire, residing at Kiel-Gaarden,

Germany, and Kiel, Germany, have invented certaln new and useful Improvements 1n.

SafetyDevices Against Explosions in the Ajr-Pipes of Internal-Combustion Engines, of which the followingis a specification.

I Should the pressure of the injection'air, for one reason or another, sink below the end pressure generated in the compression chamber of the cylinder during the opera I tion of internal combustion engines, the fuel 'at the time contained in the nozzle will,ion I the opening of the fuel injection valve, be

sprayed into the'air conduit insteadof in the cylinder. The combustible mixture generated' therebyymight on accidental ignition'give cause'to an explosion extremelydangerous to the operators'antl the engine.

In order to prevent such explosion to be transmitted to, the air supply tank, a nonreturn valve with brake disk is provided in the air duct, behVeGl'DfiliItahk and the fuel injecting valve. It'i's',-:however, not possible in this manner to prevent-' that all the partssituated in front of the .non' retu'rn valve in the; direction of the cylinder, in particular the atomizer, the atomizer needle, etc., are

.-dstroyed by the explosion. The object of the present invention is now to provide a de I 'vice, by means of which the consequences of the explosion are not lessened as for merly, but which prevents the forming of a combustiblemixture altogether and thereby avoids effectively the occurrence of an explosion in the air duct.

Two embodlments of the present invention are diagrammatically illustrated in the accompanyingdrawings and; Figure :1

shows an elevation of the device partly in section and, Fig. 2, a view sinularv to Fig.1

of a slightly modified arrangement. I

In Fig. 1 A is the working cylinder of an injection internal combustion engine-and B the fuel injecting valve. To the valve B are attached the fuel intake pipe D leading I from the fuel pump C, and the air injecting so pipe. F

' .preased which is'iconnected 'withia compump (1, its suction pipe D leads jto the fuel-supply tank E. I

In accordancewith the present invention, a shutting off member H is inserted in this fuel suction pi pe D which member isopened and closed by a'pressureregulator K in cooperation with; a connecting, rod M.

The pressure regulator K is of the usual oonstructlon and consists of a. piston-running-in a cylinder,and with a spring Lacting on one side thereof, the other side st nding under theinflutihcetif; the pressure om the injection hir,whi'ch. has admi'ttalnce to the cylinder of the pressure regulator by 'means of a branch pipe F ilrom the pipe F. The tension of the spring Llbeingso selected, that it is able to expand when the pres I i sure of the injection air has: fallen below, that required for injecting the fuelin the working cylinder. f

The opera-tiom of the described device is as follows: During sufiiciently high pressurefof the injection air, the ispringL will be compressed by the piston actuated by the pressureiof the injection air, so that the shutting ofi member H is opened as shown bydotted lines, position I, in the drawing,

and the fuel is permitted to pass through the piston of. the pressure regulator to the left, so'thatthe shutting-0ft member sirnul- I taneously is closed by meansof the connect- As the packing of the piston in the presingrods'M, see the fulfdrawir position II.

sure regulator is, on account of the high pressure of the injection air, connected with difliculties, a-diaphragm may, for this purpose be utilized instead of this piston.

, The embodiment illustrated in Fig. 2 differs from that in Fig. 1 only thereby that instead'of the spring L, a gaseous pressure means is used. This is provided in a simple manner, by directly connecting the'right' air receptacle-Q From the fuel hand cylinder-half 'ot the pressure cylind the right end face of the-pressure regulator piston is influenced by the compression pressure. This arrangement has the advantage,

that the piston of theprcssure regulator.

needs to be packed against a small portion of the pressure corresponding to the difference between the compression pressure and the injecting air pressure, that means that this arrangement is much easier to keep tight than the embodimentillustrated in Fig}. A non-return valve inserted in the pipe N prevents the transmission of the occurring pressure fluctuations in the working cylinder into the pipe N and causing a vibration of the piston of the pressure regulater. The manner of" operation of the arrangement according to Fig. 2' coincides with that shown in Fig. 1.

Instead of having the shutting-off member ll of the pressure regulator K positively connected, it might be so arranged that means'such as a spring or a weighted lever, is provided on the shuttingaiff member itself for closingit, the pressure regulator releasing only this closing device on the lowering of the pressure below a permissible amount in the air injection pipe. .WVe claim: v

1. A safety device against-explosions in the air pipes of internal combustion engines, comprising means for shutting'oll the fuel supply, directly the pressure in the'air pi pcs sinks below a certain amount, said means having a cylinder of constant volume, a reciprocating member therein, a normally open valve in the fuel conduit of the engine, said cylinder and said valve forming separate units, connection between said member and said. valve, one end of said cylinder having pipe connection with said air pipes, and pressure means for holding said member agains t said end of the cylinder,

incense 2. A safety device against explosions in,

the air pipes of internal combustion engines, comprising means for shutting off the fuel supply, directly the pressure in the air pipes sinks below a certain amount, said means having a cylinder of constant volume, a reciprocating member therein, a normally open valve inthe'fuel conduit of the engine, said cylinder and said valve forming separate units, connection between said member and said valve, one, end of said cylinder having a pipe connection with said air"pipes,and'

pressure means for holding said member against said end of the cylinder, sald pressure means having a conduit connecting the. compression chamber of the engine wlth the:

opposite end of said cylinder.

3. A safety device against explosions in the air pipes of internal combustion engines, con'iprising means for shutting ofi'the fuel supply, directly the pressurein the air pipes sinks below a'certain amount, said. means having a cylinder of constant volume, a reciprocating memberthereim-a normallyopen valve in thefuel conduit of the engine, said cylinder and said valve. forming separate units, connection between said niembcrand said valve, one end of saidcylinder having a pipe connection with said air pipes, and pressure means forholding said member 11 I i n v e against said end 01 the cylinder, said pressure means havinga'conduit connecting the compression chamber of the engine with the opposlte end of said cylinder and a nonretur'n valve in said conduit.

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