US1839878A - Fuel delivering device - Google Patents

Description

`Fam. 5, 1932.

' F. HUBER 1,839,878

FUEL DELIVERING DEVICE Filed Nov. 4, 1930 I EN Patented Jan. 5, 1932 UNITED STATES PATENT OFFICE FRITZ HUBER, 0F MANNHEIM, GERMANY, ASSIGNGR T0 HEINRICH LANZ AKTIEN- GESELLSCHAFT', 0F MANNHEIM, GERMANY FUEL DELIVERING DEVICE Application filed November 4, 1930, Serial No.

The present invention relates to a device for delivering different liquids by means of a single pump and pressurefpiping with only one pressure valve, the device being particularly adapted to serve as fuel injecting appliance for heavy oil engines.

Devices for supplying internal combustion engines with two or more liquid fuels or other liquids in mixed'condition are known already, and the usual kinds of such devices comprise as a rule one pump piston, a pressure valve, a pressure piping, and a nozzle, while the suction pipings for the various liquids open directly into the suction space of the pump. These devices suffer from the drawback that, if the pump has been working for instance with heavy oil,'the entire pump chamber is filled with heavy oil up to the injection valve and, if during starting a change is to be made to light oil, considerable time is required until the heavy oil has been removed from the pum chamber. Furthermore, if benzine is use as light oil, the pump piston will work without lubrication while delivering the benzine, and similar difculties arise when one of the liquids is water which is often added to the heavy fuel.

The invention eliminates these drawbacks by providing means which reduce the amount of heavy oil reaching the nozzle during the alternate delivery of heavy and light oils and the change from heavy to'light oil to a minimum and which prevent benzine, if used as light oil, from entering the pump cylinder which thus remains lled with the Well ubricating heavy oil even if benzine is delivered.

According to the invention, these aims are y attained by disposing one of the suction valves for the different liquids more closely to the stroke space than the other and both in spaced relation to one another.

Another feature of the invention is that the farther removed suction valve is arranged in a casing containing also the pressure valve, an arrangement which, for instance in starting devices for heavy oil engines, a'ords the advantaoe that the connection for the light oil piplng and the pressure valve may be positioned 1n the immedi- 493,289, and in Germany November 22, 1929.

ate neighborhood of the nozzle so that only a minimum of heavy oil is injected when changing from heavy to light oil.

Still another feature of the invention is that the suction valve opens more easily for one liquid than for the other, owing to variations in the spring load of the suction valves or to different arrangement of the tanks for the liquid as to height. Something similar has been proposed already, but these proposals refer to devices, in which just as many pressure pipingsas suction pipings are required.

Devices for supplying different kinds of fuels to internal combustion engines, in which at a change from heavy to light oil the former presses the latter in front of it and into the nozzle, are known which have only one fuel pump. However, the suction pipingsfor the various fuels open directly into -the pump cylinder so that, if benzine is emplo ed, the piston will come in touch with it. oreover, the known devices of this class require double pressure pipings and double nozzles.

By way of example the invention is illustrated in the accompanying drawing in connection with the cylinder head of a hot bulb engine.

Referring to the drawing, a is the fuel pump with the piston b driven by the eccentric c. When the engine stops, the piston b may be advanced by the lever CZ' and returned in the known manner by a spring e. From the pump a fuel is supplied to the nozzle f by means of the pipes g and g1. In the immediate neighborhood of the stroke space of the pump the suction valve 71, for heavy fuel is provided. Between the pipes g and g1 a valve casing 21 is disposed' for the reception of the suction valve k for light fuel and of the pressure valve Z for light and heavy oils. m is the suction piping for the light fuel and can be shut 0H by the cock n. In order to cause the valve to open more easily than the valve L, either the spring closing the valve 7c has less tension than the spring closing the valve z, or the light oil tank is positioned on a higher level than the heavy oil tank.

The device functions as follows:

During normal operation with heavy oil the cock n is closed, and the pump sucks up fuel from the 'heavy oil piping through the valve 71, and presses the oil through the pipe g1 towards the nozzle. When the engine is stopped, the pump a, the pipings g, g1 and the casing z' will be filled with heavy oil. If the engine is to be started with light oil, the cock n 1s opened, and the pump a will then suck up fuel from the pipe m. As the pump as well as the piping g are filled with heavy oil, the aspirated light oil will not reach the stroke space of the pump a and the heavy oil in the stroke space of the pump a and in the piping g willv not be pressed into the nozzle. The casing z' may be made very small and the cross sections of the piping g1 and the nozzle body kept quite narrow so that a few motions of the lever d will suice to remove the heavy oil from the nozzle f and supply the latter with light oil. The piston b does not come into contact with the light oil but merely with the heavy oil which is superior to light oil in lubricating quality.

Instead of placing the light oil tank on a higher level than the heavy oil tank or loading the suction valve c with a lighter spring than the heavy oil valve h, the heavy oil piping may be provided with a cock adapted to be closed during light oil operation, though the construction described is preferred for the reason that it effectively prevents irregularities due tonegligence of the attendants who might forget to close the cock in the heavy oil piping.

The casing may be structurally united with the nozzle body or with the body of the pump, in which case provision should be made to retain the pipe g between the stroke space of the pump and-the pressure valve, the pipe ascending preferably from h to Z.

1. A device of the type described comprising a pump, two inlet ports thereto controlled by suction valves and located in spaced relationship one to the other and at ldifferent distances from the pump, a single outlet port therefrom controlled by a pressure valve, and means for selectively causing the pump to pump a fluid from either one of the two .inlet ports and discharge the same through the singleoutlet port.

2. 'A device according to claim 1 in which the inlet port nearest to the pump is connected with a source of supply of a heavy fuel oil and the more remotely located inlet port is connected with a source of supply of a light fuel oil.

3. A device according to claim 1 in which the two inlet ports are separated from each other by a vertically disposed pipe serving both to connect one inlet port with the outlet port and the other inlet port with the/ pump.

4. A device according to claim 1 in which the suction valve controlling the more remotely located of the two inlet valves is more easily responsive to the action of the 'pump than the suction valve controlling the inlet port located closer thereto.

5. A device according to claim 1 in which the inlet port nearest to the pump is connected with a sou-rce of supply of a heavy fuel signature.

FRITZ HUBER.

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