WO2001063113A1

WO2001063113A1 - A plunger type carburetter with pore-adjusted jet-pipe

Info

Publication number: WO2001063113A1
Application number: PCT/CN2001/000119
Authority: WO
Inventors: Lei Chen; Yan Chen; Feichang Chen
Original assignee: Lei Chen; Yan Chen
Priority date: 2000-02-18
Filing date: 2001-02-08
Publication date: 2001-08-30
Also published as: AU3358601A; WO2001063113A8

Abstract

A plunger type carburetter with a pore-adjusted jet-pipe is designed to lengthen a main jet-pipe. The said main jet-pipe is of valve jacket which has a thin wall and is projected in the Venturi tube of carburetter after installation. A portion of jet-pipe wall projected in the Venturi tube is provided with one array or several arrays of pores. There is a valve stem instead of jet needle. The valve stem is moved with the plunger to controll the amount of gasoline needed by various engine operating conditions by opening or closing different number of pores. The size and the number of pores are determined by the requirement of gasoline atomizing degree and the amount of gasoline needed by various engine operating conditions.

Description

Plunger type adjustable micro-hole nozzle carburetor TECHNICAL FIELD

The invention relates to a plunger type adjustable micro-hole nozzle carburetor. technical background

The traditional plunger carburetor uses the up and down movement of the plunger to change the size of the throat, so as to control the amount of combustible mixture entering the engine cylinder. The gasoline metering task in the main working area of the engine mainly depends on the plunger. The size of the circular cross section between the oil needle and the main nozzle moving together is controlled. However, when the engine needs to output a large amount of power, when the plunger and the oil needle are raised to a higher position, the annular cross section between the oil needle and the main nozzle is larger than that of the main measuring hole, and the fuel supply is controlled by the main measuring hole. The oil needle cannot control the amount of oil in this area. The vacuum carburetor is also an adjustable throat type carburetor. As the amount of air taken in by the engine changes, the degree of vacuum at the throat will also change. The diaphragm divides the air chamber of the plunger into two parts. The pressure difference in the chamber also changes accordingly, so that the plunger is automatically adjusted up and down to reach a new balance with the spring force of the plunger spring, so that the oil needle that is raised and lowered simultaneously with the plunger can also adjust the fuel supply amount more accurately. Similarly, in the heavy load area of the engine, the oil quantity can only be controlled by the main measuring hole. From the above analysis, it can be seen that the plunger type and iso-vacuum carburetor are mainly used in the engine's main working area (low and medium load range). The oil supply is mainly adjusted by the needle, compared with the fixed throat type carburetor. Device, because it does not have components such as plungers, oil needles, etc., the gasoline supply cannot be adjusted according to engine operating conditions is a major improvement; but in a certain area of engine heavy load operating conditions can not play the role of adjustment, so Only the foam pipe can be set to suppress the excessive injection. In addition, the plunger type and iso-vacuum carburetor injects fuel in an annular gap formed between the needle and the main nozzle. As the needle is raised, the larger the annular gap is, the finer the gasoline is. The worse the degree, the worse the atomization, and the worse the quality of mixing with the air. Li Zhong, a citizen of Tianjin, the People's Republic of China, designed the "spray tube plunger type" "Oiler" (Chinese patent 96205136.5), its main oil supply system uses a spray tube installed below the plunger to replace the original oil needle, the spray tube passes through the throat, the guide tube, and is inserted into the oil well in the foam chamber. There are several spray holes that communicate with the center of the tube. This structure has the following disadvantages: First, when the plunger is not fully open, because the spray tube is inserted into the oil well, the foam tube does not work, and excessive fuel injection will occur, and the oil and gas cannot be controlled. The correct proportion. Second, the spray tube of this structure is like a cartridge filter, and the spray holes are easy to block. Third, the spray tube is a semi-circular circular tube. High-speed flowing gasoline forms a vortex in the circular tube, resulting in The amount of fuel is unstable, so that the engine operation is also unstable. At present, the electronic fuel injection technology of the engine has been widely used. It uses an electronic control system to perform timing and quantitative injection control of the fuel of the engine, and instantaneously orders the fuel in the intake pipe. Point or multi-point injection of gasoline or high-pressure cylinder injection; but because its gasoline injection process is extremely short-lived compared to the entire intake process, The degree of mixing of fuel and air atomized actuator is not good, which also affects the quality of combustion. Object of the invention

The purpose of the present invention is to solve the disadvantages that the original plunger type carburetor and iso-vacuum type carburetor cannot adjust the gasoline supply in the area of heavy engine operating conditions, and solve the "spray tube plunger type carburettor" designed by Li Zhong. The above-mentioned shortcomings of the "carburetor" also provide a carburetor that can accurately supply the required amount of fuel in all operating conditions and has a better degree of atomization of gasoline than EFI technology. Summary of invention

The carburetor of the present invention includes various systems such as oil feeding, starting, idling ... transition, main oil supply and the like. In the main oil supply system, the main nozzle is designed as a cylindrical structure, and one or more rows of micro-holes are arranged on the cylinder wall along the axial direction. The size of the micro-holes is based on the vacuum degree of the carburetor throat of each engine at medium load. The size and the amount of gasoline atomization are determined. The size and number of micropores must not only meet the amount of oil required for each operating condition of the engine, but also ensure sufficient atomization of gasoline. Generally, the pore size is about 0.1 ~ 0.3 mm. Every The number of rows of holes and the location of each hole are determined according to the fuel supply characteristics of the gasoline engine at medium and small loads and under heavy load conditions. The valve rod is used instead of the oil needle. In order to generate the normal spraying force of the foamed oil and gas in the nozzle from the micro holes, no vortex is generated in the nozzle, and the valve head is also designed to be longer for the convenience of assembly. Taper, but does not need a tapered thread structure like a needle. The tail of the valve stem is designed with multiple ring grooves, and the retaining ring is inserted into a ring groove to change the position of the valve stem in the main nozzle. The bottom of the plunger is designed to be hollow, leaving room for nozzle installation.

The carburetor of the present invention can be designed as a double nozzle or multi-nozzle structure. Two or more valve stems are installed on the same plunger, and a corresponding number of nozzles are installed on the carburetor. The intake direction is lined up. This structure is designed for high-power gasoline engines. Brief description of the drawings

FIG. 1 is a schematic diagram of a plunger type adjustable micro-hole nozzle carburetor with a single nozzle.

FIG. 2 is a schematic diagram of a plunger type adjustable micro-hole nozzle carburetor with double nozzles. Preferred embodiment

The present invention will now be described in detail with reference to the drawings.

According to FIG. 1, the carburetor main oil supply system includes a plunger 1, a barrel main nozzle 2, a valve stem 3, a foam pipe 4, a main measuring hole 5, a retaining ring 6 and a wide rod ring groove 7. The bottom of the plunger is designed to be hollow, leaving a space for the installation of the barrel main nozzle; the barrel main nozzle is located on the semi-cylindrical side facing away from the intake direction of the intake pipe, and a row or Several rows of micro-holes, tested on motorcycles, the micro-holes of about 0.15mm work well; the front end of the valve stem is designed with a long taper, and when the taper of the valve stem and the intersection of the cylinder with the plunger move, The micro holes for oil supply required by each operating condition of the engine are opened; the retaining ring and the stem ring groove are mainly used to adjust the position of the valve stem; the foam tube and the main measuring hole are only used to assist in controlling the oil when the engine is running at high speed and under heavy load The role of quantity. According to Figure 2, the bottom of the plunger is designed to leave space for the installation of double nozzles. Two wide rods are installed on the plunger, and two main nozzles 2 'and 2 "are installed on the carburetor. The tube is on the side of the semi-cylindrical side facing away from the inlet direction of the intake pipe. One or more rows of micro holes are arranged on the pipe wall along the axis direction. The spray angle of the 2 "nozzle micro hole design should avoid the 2 'nozzle. The size and number of holes must not only meet the amount of oil required for each operating condition of the engine, but also ensure sufficient atomization of gasoline. In this way, the movement of the plunger is used to control how many micro-holes are opened on each nozzle to ensure the fuel supply required for each working condition of the high-power engine.

The carburetor of the present invention has the following advantages compared with the original plunger type carburetor, iso-vacuum carburetor, "spray tube plunger type carburetor" designed by Li Zhong and the engine fuel electronic injection technology:

1. Regarding the working conditions of gasoline engines, the adjustment of fuel supply is more accurate when the engine is running at high speed and under heavy load.

2: Because it uses micro-hole injection during the entire intake process of the engine, the degree of gasoline atomization is better. (The performance of the carburetor in this structure exceeds that of the electronic injection system.) After the test, the average fuel consumption was reduced by about 15%. It also greatly reduces exhaust emissions. Emission test under the working condition method, the emissions of carbon monoxide, hydrocarbons and nitrogen oxides are far below the European II standards.

3. Because the structure of the valve stem and the main nozzle is similar to the valve stem and valve sleeve of the hydraulic parts, the relative movement is frequent, and it will not cause the accumulation and clogging of cotton-like impurities.

4. Because the main nozzle is installed in the throat of the carburetor, the valve stem is designed to be tapered, high-speed flowing gasoline will not generate vortex in the nozzle, and the oil output is stable, so that the idle speed of the engine and the operation of each working condition are more stable. .

The carburetor of the present invention is suitable for various types of motorcycles and automobiles or other gasoline engines that need to adjust the output speed and power.

Claims

Rights request

1. A plunger-type adjustable micro-hole nozzle carburetor comprising a main oil supply system, characterized in that: the main oil supply system is provided with a barrel main nozzle, and a semi-cylindrical cylinder on the back side in the air intake direction One or more rows of misaligned mini-holes in the axial direction are set on the tube wall. The bottom of the plunger is designed to be hollow, leaving a space for the installation of the barrel main nozzle. The wide rod and valve stem that move with the plunger are designed. The head is provided with a long needle taper, and the tail of the valve stem is designed with multiple ring grooves, and the position of the wide stem is adjusted by a retaining ring.

2. The carburetor according to claim 1, characterized in that: the size and number of the micro-holes in the barrel-type main nozzle are determined according to the characteristics of the working conditions of the engine and the requirements of gasoline atomization;

3. The carburetor according to claim 1 or 2, characterized by having a double nozzle or a multi-nozzle structure; the bottom of the plunger is designed to leave space for the installation of the double or multiple nozzles, and the plunger is designed to be installed. Two or more wide poles.