SU1550201A1 - Injection pump-nozzle - Google Patents

Abstract

The invention relates to electrically controlled fuel injection devices and improves speed, preheating the fuel, extends the range and accuracy of dosing. Electrode (E) 4 is installed in housing 1 with fuel inlet duct 2 and nozzle 3, isolated from housing 1 by sleeve 5 made of electrically insulating material, rigidly connected to the latter with the formation of an evaporation chamber 6 and a super-cavity 7, a ring-shaped discharge heat exchanger (PT ) 8 of a porous ceramic material with electrically conductive inclusions, a locking element (D) 9, a spring 10 connected to an E 4, and a shutter, made in the form of a check valve 11. The ZE 9 is installed on an E 4 through an insulator 13, and the lower end E 4 is located inside PT 8 with radial y gap. The fuel is supplied to the evaporation chamber 6, and an electrical impulse of high voltage is applied to the E 4. Between the lower end of E 4 and the housing 1 there occurs a discharge penetrating the PT 8. The fuel in the pores of the PT 8 evaporates, the pressure in the evaporation chamber 6 increases, the EE 9 together with the E 4, the sleeve 5 and the sleeve 12 moves upwards, opening the nozzle 3. Injection occurs. The dose of fuel is regulated by changing the parameters of the control electrical impulse and the pressure of the fuel supplied to the evaporation chamber 6. 2 Cp. f-ly, 1 ill.

Description

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The invention relates to an engine structure, in particular to electrically controlled fuel injection devices.

The purpose of the invention is to increase speed, provide preheating of fuel, expanding the range and accuracy of dosing.

The drawing shows the proposed pump nozzle.

The pump nozzle includes a housing 1 with a fuel inlet duct 2 and a nozzle 3, the electrode 4 mounted in the housing 1 is isolated from the housing by a sleeve 5 of electrically insulating material rigidly connected to the latter with the formation of the evaporation chamber 6 and the supra-cavity 7, an annular discharge a heat exchanger 8 made of porous ceramic material with electrically conductive inclusions, a locking element 9 mounted on the lower end of the electrode 4, a spring 10 placed in the supernatural cavity 7 and connected to the upper end of the electrode k, and a creative, made in the form of a check valve 11 placed in the fuel supply channel 2. The sleeve 5 with the electrode is fixed in the holder 12 with the possibility of its reciprocating movement in the housing 1. The locking element 9 is mounted on the electrode through an insulator 13. For supplying an electric pulse on the electrode t the pump nozzle is provided with a tip 1 connected to the spring 10. The lower end of the electrode 4 is placed in the central hole of the ring-shaped discharge heat exchanger 8 with a radial clearance.

Pump-nozzle works as follows.

Fuel from the power source is supplied through a pipeline (not shown) under pressure through a check valve 11 and channel 2 is fed to the evaporator chamber RU 6.

When applied to the electrode k through the tip 1 and the spring 10 of a high-voltage control electrical pulse, an electrical discharge occurs between the lower end of electrode A and the housing 1, which penetrates the volume of the discharge heat exchanger 8 in the radial direction. Fuel in the heat exchanger 8, evaporates at the same time

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heating of conductive inclusions occurs. The evaporating fuel vapor pressure spreads throughout the entire volume of the evaporator chamber 6. The check valve 11 prevents the fuel from flowing back into the pipeline. When the vapor pressure of the fuel in chamber 6 is higher than the force generated by the spring 10, the locking element 9 together with the electrode 4 is bushing 5 and the sleeve 12 moves upwards, opening the nozzle 3 through which the evaporated fuel is injected into the engine. When the fuel flows through the nozzle 3, the pressure in the evaporation chamber 6 drops and the electrode 4 under the action of the compressed spring 10, together with the sleeve 5, the sleeve 12 and the locking element 9 moves downwards. The nozzle 3 closes and the injection stops. When the pressure in the evaporating chamber 6 is below the fuel supply pressure to the injector pump, the check valve 11 opens, as a result of which the fuel through the channel 2 enters the evaporation chamber 6, filling the pores of the discharge heat exchanger 8, where it is additionally heated due to the heat removed from the electrically conductive inclusions heated by the action of an electric pulse. After the evaporating chamber 6 is filled with fuel, the work cycle ends. The pump-injector is ready to supply the next control electrical impulse to tip 1. The dose of fuel per cycle is controlled by changing the parameters of the control electrical impulse and the pressure of the fuel supplied to the evaporator chamber 6,

The proposed Surge pump (as compared to the known ones) has an increased speed, an extended range, and metering accuracy s provides preheating of the fuel, which together leads to an improvement in the injection process.

Claims (3)

Invention Formula 1, a pump nozzle comprising a hollow body with a fuel inlet channel and a nozzle, an electrode mounted in the case, insulated from the case by a sleeve of electrically insulating material, rigidly connected to the latter to form an evaporation chamber placed on the side of the nozzle, and a supra-cavity, and a shutter that communicates the evaporation chamber with the fuel supply channel, the lower horse of the electrode is placed in the evaporation chamber, and the upper one is located in the supra-articular cavity, which, in order to increase speed, fuel preheating, expansion of the range and accuracy of metering, the pump nozzle is equipped with a ring-shaped discharge heat exchanger made of porous ceramic material with electrically conductive inclusions placed in the evaporation chamber in 1550201 the central hole of which is located with the radial clearance of the lower end of the electrode, the sleeve is installed in the housing with the possibility of reciprocating movement, the lower end of the electrode is provided with a locking element, and a spring is placed in the super-cavity cavity connected to the upper the end of the electrode. 2. The pump injector according to claim 1, wherein the valve is designed as a check valve. 3. A pump nozzle according to claims 1 and 2, characterized in that the pores of the discharge heat exchanger are oriented in the direction of the nozzle.