RU2031238C1 - System for two-time supplying of fuel to diesel engine - Google Patents

Abstract

FIELD: engine engineering. SUBSTANCE: system has a device for diaphragm separation of fuel fractions. At first, light fractions are fed to the intake manifold. The main charge is then fed to the cylinders by a fuel pump. EFFECT: enhanced efficiency of the engine. 2 cl, 2 dwg

Description

 The invention relates to mechanical engineering, in particular to engine building, and can be used in fuel supply systems of diesel engines.

 A known system for two-time fuel injection containing a sequentially installed fuel tank, a coarse filter, a fuel priming pump and fine filters, a high pressure fuel pump, an intake and exhaust pipe and a fuel supply device to the intake pipe, consisting of two high pressure fuel pumps, an evaporator nozzles.

 However, the known system injects one fuel into the intake manifold and into the engine cylinders, which reduces the efficiency of the system.

 The purpose of the invention is improving efficiency.

 This goal is achieved by the fact that the system is equipped with a device for separating fuel fractions, made in the form of a cylindrical body, a tubular membrane element with an inlet and outlet placed in the body with the formation of an annular cavity, a fitting mounted on the body, seals installed between the body and the membrane element on the inlet and outlet of the latter, and the inlet of the tubular element is in communication with the fine filter, and the output is in contact with the high-pressure fuel pump, and the annular cavity is in communication with the inlet pipe vodom through fitting and check valve. In addition, additional tubular membrane elements can be installed in the housing.

 In FIG. 1 shows a diagram for a two-time fuel supply of a diesel engine; in FIG. 2 - a device for the separation of fuel fractions.

 The system comprises a diesel engine 1 with intake 2 and exhaust 3 manifolds, a high-pressure fuel pump 4 with a fuel priming pump 5, a sump 6, a coarse filter 7, a fine filter 8, a fuel fraction separation device 9, connected by a pipe 10 through a non-return valve 11 s intake manifold 2.

 The device for separating fuel fractions contains a cylindrical housing 12 with a tubular membrane element 13 placed inside it with the formation of an annular cavity between the housing 12 and the element 13. Between the housing 12 and the membrane element 13, seals 14 are installed at the input and output of the latter. Lids 15 are mounted on the cylindrical housing 12 and a fuel discharge fitting 16, and gaskets 17 are installed between the covers 15, the housing 12 and the tubular membrane element 13. The inlet of the tubular membrane element 13 is in communication with a fine filter 8, the output is with high pressure fuel pump 4, and the annular cavity is communicated by a pipe 10 with an intake manifold 2 through a check valve 11.

 The system for two-time fuel supply of a diesel engine operates as follows.

 Fuel from the tank is sequentially supplied through a sump 6, a coarse filter 7, a fuel priming pump 5, a fine filter 8 to a membrane device for separating fuel fractions 9. Passing through a tubular membrane element 13, mainly light fractions of diesel fuel are forced through the walls of the membrane element 13 and enter into the annular cavity between the membrane element 13 and the housing 12. Then, the fuel enters the high pressure fuel pump and engine cylinders. Due to the vacuum in the intake manifold, the non-return valve 11 opens and the light fractions of diesel fuel from the device for separating the fractions of fuel 9 through the pipeline 10 enter the intake manifold 2 of the engine. When a small portion of fuel is supplied to the intake manifold as a result of pre-flame oxidation processes, active chain reaction centers are created that initiate ignition of the main dose of fuel. At the same time, the stiffness and maximum combustion pressure are reduced, the emission of nitrogen oxides, the noise level are reduced, and the reliability of the diesel engine is increased.

 The optimal dose of fuel pre-supply to the intake manifold (12 ... 20%) is achieved by selecting the area of the tubular membrane element 13. For diesel engines of high power, a battery of tubular membrane elements can be installed in the cylindrical housing 12.

Claims (2)

 1. SYSTEM FOR TWO-TIME FEEDING OF DIESEL ENGINE FUEL, comprising a sequentially installed fuel tank, a coarse filter, a fuel priming pump and fine filters, a high pressure fuel pump, an intake and exhaust pipe and a fuel supply device to the intake pipe, characterized in that, with In order to increase efficiency, the system is equipped with a device for separating fuel fractions, made in the form of a cylindrical body, a tubular membrane element with an input and output placed about in the casing with the formation of an annular cavity, a fitting mounted on the casing, seals installed between the casing and the membrane element at the inlet and outlet of the latter, the inlet of the tubular element being in communication with a fine filter, the outlet in communication with a high-pressure fuel pump, and the annular cavity in communication with an inlet pipe through a fitting and a check valve.  2. The system according to claim 1, characterized in that additional tubular membrane elements are installed in the housing.

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