KR970001519Y1 - A fresh-air inducting device of fuel supplying for lpg engine - Google Patents

Abstract

None.

Description

New Guidance System of LPG Engine Fuel Supply System

1 is a cross-sectional view showing a schematic configuration of a fuel supply device of a conventional LPG engine.

2 is a cross-sectional view showing a new air induction device portion of the fuel supply device of the LPG engine of the present invention.

3 is an enlarged cross-sectional view showing only the new air induction device portion of the fuel supply device of the LPG engine of the present invention.

＊ Explanation of symbols for main parts of drawing

1: housing 2: pipeline

3: throttle neck 4: fuel nozzle

5: hinge shaft 6: throttle valve

20: new device 21: casing

22: diaphragm 23: needle valve

24: spring

The present invention relates to a novel induction device for a fuel supply device of an LPG engine, and more specifically, to a fuel supply device for an automobile, in particular a vehicle using LPG as a fuel, by additionally providing a fuel The present invention relates to a novel air induction device for a fuel supply device for an LPG engine having a configuration for stable operation at a low speed rotation of the supply device.

In the case of automobiles, especially those with LPG as the main fuel, proper air-to-fuel ratio control has a very significant effect on the composition of the exhaust gas, so proper air-to-fuel ratio control requires very appropriate control in consideration of atmospheric factors. to be.

Therefore, there are various control means for the air-to-proper fuel ratio, but most of them have electronic control means or control by a feedback signal, which causes cost increase and is difficult to apply to small vehicles. .

A device for providing a proper air mixing ratio in a conventional fuel supply of such an LPG engine is shown in cross section in FIG.

The duct 2 is formed in the housing 1 which is usually manufactured by a method such as die casting made of aluminum, and a throttle neck having a narrow diameter of the duct 2 on one side (right side in the drawing) of the duct. (3) constitutes a part of the projecting diameter of the conduit.

On the throttle neck 3, a fuel nozzle 4 supplied with fuel from a vaporizer or the like not shown is partially provided while being provided with a fuel adjusting screw 9.

At the rear of the throttle neck 3, the throttle valve 6 rotated by the hinge shaft 5 rotates to open or close the conduit 2.

The air pipe 10 is connected to the front upper end side of the throttle valve 6, and is assembled with the adjusting screw 8 having a conventional screw configuration.

In the above configuration, conventionally, the mixing control of fresh air to fuel is performed by adjusting the fuel adjusting screw 9 of the fuel nozzle 4 on the throttle neck 3 flowing into the conduit 2. , So-called Open Loop Mixer Control, which is determined as a mechanical setting of the adjusting screw 8 of the air pipe 6 and a low speed adjusting screw (not shown).

However, as described above, the adjustment of the fuel adjusting screw 9 of the fuel nozzle 4 on the throttle neck 3, the adjusting screw 8 of the air pipe 6, and the low speed adjusting screw (not shown) are performed. In the open-loop mixing control at low speed, the inflow of air is extremely low at low speed at the time when the throttle neck 3 is almost closed with the non-uniformity of the fuel concentration supplied from the bearer at low speed. Has a problem that the control of fuel is difficult,

In addition, due to the durability of the plurality of members there is a problem that the exhaust gas of the configuration that causes air pollution after a time elapses, in spite of the use of the total sheet.

The present invention has been made in view of the problems of the fuel supply device of the LPG engine of the conventional configuration as described above is to solve the above problems by having an improved fresh air induction device.

The novel air induction device of the fuel supply device of the LPG engine of the present invention together with the accompanying drawings will be described in more detail in comparison with the prior art.

2 is a cross-sectional view showing a novel air flow unit portion of the fuel supply device of the LPG engine of the present invention, Figure 3 is an enlarged cross-sectional view showing only the fresh air induction device portion of the fuel supply device of the LPG engine of the present invention.

The same member as the conventional configuration uses the same member number.

The novel air induction device 20 of the fuel supply device of the LPG engine of the present invention is a control means of the diaphragm operation additionally attached to the fuel supply device of the conventional configuration.

As shown in FIG. 2, the novel air induction device 20 of the present invention, which is additionally configured outside the housing 1 of the fuel supply device, is housed in a single casing 21 as a closed actuator and each connecting tube is connected. It is configured as. This will be described in detail with reference to FIG. In FIG. 3, the shape formed integrally with the housing 1 is illustrated, but may be configured as a separate single case.

In the casing 21 made of metal or the like, the diaphragm 22, which is an elastic sealing operation material made of rubber or the like, bisects the inside of the casing 21, and a conical needle valve 23 is fixed to the center portion of the diaphragm 22. It is fixed to flow up and down integrally with the ram (22).

A spring 24, which is a power source for assisting the expansion and contraction of the diaphragm 22, is elastically provided above the diaphragm 22, and a vacuum port (behind the throttle valve 6) is provided in an upper space of the diaphragm 22. A connecting pipe 31 fluidly connected to V) is connected, and an air supply pipe 32 connected to the rear of the throttle valve 6 is connected to the lower space.

By having the adjusting hole 25 at the center of the diaphragm 22 below, the adjusting disk 26, together with the needle valve 23, whose opening degree is determined, is also fixed in the casing 21.

The adjusting disk 26 and the diaphragm 22 divide the inner region of the casing 21 into three parts, and the elastic adjustment space A between the casing 21 and the diaphragm A, the diaphragm 22 and the adjusting disk 26. Discharge space (B) between

It is composed of an adjusting space C between the adjusting disk 26 and the casing 21. A novel air supply pipe 33 is connected to the side wall of the casing 21 forming the adjusting space C.

The new air induction device of the fuel supply device of the LPG engine of the present invention of the above configuration will be described in more detail.

In addition to the control by the adjustment of the respective adjustment screws in the case of the normal steady state, etc., between the casing 21 and the bullet control space A between the diaphragms is applied to the vacuum port V at low speed rotation. The needle valve 23 rises upward while overcoming the spring 24 due to the negative pressure,

Therefore, the adjustment hole 25 on the adjustment disk 26 is opened to supply additional air, thereby supplying air to the fuel, and thereby supplying air when the low speed rotation occurs, that is, when the throttle valve 6 is almost upright. This increases the ratio of air to fuel, resulting in a combustion effect that is close to complete combustion, which greatly increases the combustion efficiency, thereby minimizing pollution of outside air at low speeds, and has an additional effect of increasing fuel efficiency. will be.

The novel air induction device of the LPG engine fuel supply device of the present invention as described above is provided as a single auxiliary means in addition to a conventional vehicle having an open-loop mixing control means, so that combustion at low speeds in which exhaust gas is severely emitted is particularly important. It is a useful design to minimize the emission of incomplete exhaust gas at low speed, which is the owner of increased fuel economy and environmental pollution by maximizing efficiency.

Claims (4)

In the housing (1), a conduit (2) is formed and a fuel nozzle in which fuel is multiplied in the throttle neck on the conduit is provided with a fuel adjusting screw, and a throttle valve rotated by a hinge shaft (5) behind the throttle neck. A fuel supply apparatus for an LPG engine having an adjustment screw by opening or closing a pipeline by rotating and connecting an air pipe to a front upper side of the throttle valve; The fuel supply device is a novel air induction apparatus of the fuel mixing device of the LPG engine, characterized in that further comprising a control means for additionally supplying fresh air at low speed rotation. The novel air induction apparatus of a fuel supply device of an LPG engine according to claim 1, wherein said regulating means is an opening and closing means of diaphragm operation additionally attached to said fuel supply device. The method of claim 1, wherein the adjusting means is provided with a casing (21) and the space for adjusting the bullet between the casing (21) and the diaphragm (A), the discharge space (B) between the diaphragm (22) and the adjusting disk (26). ), Divided into an adjusting space C between the adjusting disk 26 and the casing 21; The diaphragm 22 shot by the spring 24 flows up and down integrally with the needle valve 23 in the center, and has an adjustment hole 25 at its center to open and close in cooperation with the needle valve 23. A control disk 26 is provided, and a connecting pipe 31 fluidly connected to a vacuum port V behind the throttle valve 6 is connected to an upper space of the diaphragm 22, and a throttle valve is connected to a lower space. (6) is connected to the air supply pipe 32 for supplying air is connected to the control space (C) has a configuration that the novel air supply pipe 33 is connected; The diaphragm flows up and down by the negative pressure from the connecting pipe (31), thereby providing additional fresh air by opening the fresh air supply passage at low speed rotation. The novel air induction apparatus of claim 1, wherein the casing (21) may be integrated with the housing (1) of the fuel supply apparatus.