RU2162544C2 - Fuel injection system fuel delivery meter - Google Patents

Abstract

FIELD: mechanical engineering; internal combustion engines; testing facilities of fuel injection equipment. SUBSTANCE: proposed device has vessel for collecting working liquid, three-way valve, drain tube, bushing with sealing ring, pipeline and level tube. Metering vessel whose inner surface is coated with monolayer of hydrophobic substance is used in device. Water is used in vessel as check liquid. For this purpose liquid collecting vessel and metering vessel are connected to form communicating vessels. EFFECT: simplified design, reduced cost of manufacture, increased capacity and improved accuracy of measurement. 1 dwg

Description

 The invention relates to the field of testing fuel-spraying equipment of internal combustion engines, and more particularly to a device for measuring the fuel supply of fuel-spraying systems.

 Known devices for measuring fuel supply with a piston-type sensor with a lip seal of a precision piston, the movement of which is transmitted to the sensor converting movement into an electrical signal.

 Also known are devices for measuring fuel supply, including glass measuring vessels with a scale.

 The disadvantages of such devices are the complexity and high cost of manufacturing piston-type devices and low measurement performance and the complexity of measurements with the required accuracy of devices with glass measuring containers.

 The technical performance of the claimed device is quite close to the design described in description 1.

 The disadvantage of this device is that it is inefficient and allows a large measurement error due to the low resolution of the scale, slow and unstable flow of fuel or other working fluid (hereinafter working fluid) from the walls of the vessel and the presence of a meniscus formed by the surface of the working fluid due to the phenomenon of capillarity. The smaller the diameter of the measuring vessel, the more strongly this phenomenon affects, as well as the greater part of the volume of the working fluid in contact with the surface of the walls of the vessel (with the same volume of the working fluid in vessels of different diameters).

 The aim of the invention is to increase the productivity and accuracy of measurements.

 To achieve this goal, a measuring vessel is used in the device, the inner surface of which is covered with a monomolecular layer of a hydrophobic substance, and water is used as a control liquid in the vessel, for which the vessel for collecting the working fluid and the measuring vessel are connected and form communicating vessels.

 Such a solution allows the use of a small diameter measuring vessel with a high resolution scale, for example, with a scale division price of 0.02 ml.

 The device is schematically depicted in the drawing and contains a measuring vessel 1 filled with water 2, a pipe 3, a sleeve 4, a sealing ring 5, a level 6 tube, a vessel for collecting control fluid 7, a three-way valve 8, a drain pipe 9.

 The device operates as follows.

 In the main position, a three-way valve 8 connects the vessel 7 to the tube 6. When measuring the flow of the working fluid, the valve 8 connects the vessel 7 to the vessel 1. After the bench counter has counted the specified number of cycles, the electromagnet switches the valve 8 to the main position. When this measuring vessel is connected to the tube 6.

 Thus, this goal is achieved by using a measuring vessel, the inner surface of which is covered with a monomolecular layer of a hydrophobic substance, and using water as a control liquid in the vessel, for which the vessel for collecting the working fluid and the measuring vessel are connected and form communicating vessels.

 This allows the use of a measuring vessel with a high resolution scale. For example, with a division value of 0.02 ml.

 As a result of patent research, it was not revealed that a measuring vessel for measuring the fuel (working fluid) supply is used, the inner surface of which is covered with a monomolecular layer of a hydrophobic substance, and water is used as a control fluid in the vessel, for which the vessel for collecting the working fluid and the measuring vessel are connected and form communicating vessels.

 Therefore, the proposed device meets the criterion of "significant differences".

 List of sources used.

 1. Description and maintenance instructions for the test bench NC 128-3208: ed. Department of Trade and Technical Services Motorpal Jihlava Czechoslovakia, 1986

 2. UK patent GB 210540 A.

Claims (1)

 A device for measuring the fuel supply of fuel injection systems, comprising a vessel for collecting working fluid, a three-way valve, a drain pipe, a sleeve with a sealing ring, a pipeline, a measuring vessel and a level pipe, characterized in that the device uses a measuring vessel, the inner surface of which is coated with a monomolecular layer hydrophobic substance, and water is used as a control liquid in the vessel, for which the vessel for collecting the working fluid and the measuring vessel are connected and form communicating vessels.