KR20040087015A - Solenoid valve for fuel suppiy control of LPG automobiles - Google Patents

Abstract

PURPOSE: A solenoid valve structure for controlling the fuel supply of an LPG(Liquefied Petroleum Gas) vehicle is provided to prevent tar from being accumulated in the valve by discharging the tar flowing in through a gap between an inner peripheral wall of a housing and a plunger through an outlet to a vaporizer only by opening a valve seat. CONSTITUTION: In a solenoid valve structure for controlling the fuel supply of an LPG vehicle, a valve body(121) formed at the front end of a plunger(120) receiving pressure of a spring(122) in a cut-off solenoid valve housing(110) opens and closes a valve seat(113) as power is applied to a solenoid or not. An inlet(111), an outlet(112), and the valve seat of the cut-off solenoid housing are aligned on the straight line. The plunger receiving the pressure of the spring and the valve body are operated, opened and closed in the same direction from the inlet to the outlet along the progressive direction of a passage.

Description

Solenoid valve structure for fuel suppiy control of LPG automobiles

The present invention relates to the structure of the solenoid valve for fuel supply control of an LPI vehicle, and in particular, a phenomenon in which tar such as tar is stagnated in an LPG flow path inside a cut-off solenoid valve installed at an inlet side of an LPG vehicle. The present invention relates to a solenoid valve structure for controlling fuel supply of an LPG vehicle, which can prevent the problem of poor starting failure of an LPG vehicle.

In general, most LPG vehicles are filled with liquid LPG fuel in a fuel tank, and the liquid fuel filled in the fuel tank is mostly used in a state where a mixture of inexpensive butane and expensive propane is mixed at a predetermined ratio to reduce fuel costs. .

In addition, a vaporizer (Vaporizer), which is one of the important parts of a vehicle using fuel, plays an important role in converting the liquid LPG fuel supplied from the fuel tank into a gas, and the fuel supplied from the fuel tank is supplied to the inlet side of the vaporizer. Fuel is supplied through the fuel supply line, which in its original specification had the fuel supply pipe end fastened directly to the inlet side of the carburetor.

However, in general, the position of the carburetor is located in the engine room, so the LPG fuel in the high-temperature starting fuel supply pipe becomes excessively elevated due to the high temperature around it. When the gas is introduced into the carburetor there is a problem that the startability is not good.

Therefore, in order to improve this, conventionally, a cut-off solenoid valve is installed at the inlet side of the opportunity unit as shown in FIG. 1 and when the power is supplied to the cut-off solenoid at the start of the vehicle, the plunger opens the valve seat to open the carburetor. LPG fuel is supplied to the inside, so that the startability is improved to be started regardless of the external temperature. Such a conventional cut-off solenoid valve has the following problems due to the flow path of the fuel.

That is, in the conventional cut-off solenoid valve installed at the inlet side of the vaporizer 30 as shown in FIG. 1, the inlet side 11 and the outlet side 12 of the housing 10 have a valve seat 13. Is connected at right angles so that the plunger 20 operating the valve seat 21 for opening and closing the valve seat 13 is mounted at right angles with the inlet side 11 and the outlet side 12. It is configured to work.

In the case of LPG fuel, when a liquid fuel is vaporized into a gas, a tar component is generated, and when the amount of tar accumulated in the gap of each solenoid component increases, there is a problem in operation of each solenoid component. Will be created.

That is, when the cut-off solenoid is applied, some of the fuel in the plunger 20 portion is generated as a small tar in the valve housing 10 as the vaporization proceeds. As it progresses, it gradually increases, and the increased tar eventually accumulates in the gap between the plunger 20 and the valve housing 10.

At this time, the conventional cut-off solenoid has a flow path structure for opening and closing the valve seat 13 in a state where the plunger 20 is perpendicular to the inlet side 11 and the outlet side 12 during valve operation as described above. When the valve seat 13 is opened and the fuel passes, the tar buried in the region adjacent to the valve body 21 is swept away along with the passing fuel.

However, the fuel flowed in through the inlet side 11 and far from the burning valve seat 13 caught in the peripheral gap where the spring 22 of the plunger 20 is located immediately exits through the adjacent valve seat 13. As the fuel passes, the tar trapped in the gap around the spring 22 side is not easily swept away, but gradually accumulates, and if a large amount of tar is caught in the gap, the power is finally applied to the cut-off solenoid. Since the operation of the plunger 20 is not possible, the fuel supply to the vaporizer is not good, and thus there is a problem that the startability is poor.

Accordingly, the present invention was developed to solve the problems of the conventional cut-off solenoid as described above, and the object of the present invention is that it is not possible to suppress the occurrence of tar in the cut-off solenoid on the LPG component. It is possible to provide a solenoid valve structure for controlling fuel supply of an LPI vehicle, in which a tar can be discharged to a carburetor before it is stagnated and accumulated in the valve so that the plunger operation of the valve is always smooth even when the vehicle mileage increases.

The present invention is to ensure that the inlet and outlet side of the cut-off solenoid in a straight state to achieve the above object, and the plunger and the valve body installed therebetween also operate in the flow direction of the flow path to open and close the valve seat It characterized in that the solenoid valve structure for controlling fuel supply of the vehicle is formed.

In the present invention, even if the tar generated inside the valve flows into the gap between the plunger and the housing, the fuel flowing from the inlet side at each start-up passes toward the opposite side from one side of the gap between the plunger and the housing as well as the central flow path. Since the tar is entrained in the outlet side and sent out to the carburetor, there is no fear that the tar will stagnate and accumulate inside the valve, thereby achieving the above object effectively.

1 is a perspective view showing a state where a conventional solenoid valve for LPG fuel supply control is installed

Figure 2 is a cross-sectional view showing the operating state of the conventional solenoid valve

Figure 3 is a perspective view illustrating a state in which the solenoid valve for LPG fuel supply control of the present invention is installed

Figure 4a is a cross-sectional view showing a closed state of the solenoid valve for LPG fuel supply control of the present invention.

Figure 4b is a cross-sectional view showing an open state of the solenoid valve for LPG fuel supply control of the present invention.

FIG. 5 is an enlarged cross-sectional view illustrating a flow of fuel by enlarging the inner circle A of FIG. 4B according to the present invention; FIG.

Explanation of symbols for main parts of the drawings

110 housing 111 inlet side

112: outlet side 113: valve seat

120: plunger 121: valve body

122: spring 130: carburetor

Hereinafter, described in detail by the accompanying drawings the technical configuration and operation of a preferred embodiment that can effectively achieve the above object of the present invention.

3 is a perspective view illustrating a state in which a solenoid valve for LPG fuel supply control according to the present invention is installed, and FIG. 4A is an enlarged cross-sectional view illustrating main parts of a plunger operating in a cut-off solenoid valve of the present invention.

As shown therein, the valve body 121 installed at the tip of the plunger 120 inside the cut-off solenoid valve housing 110 in the configuration of the present invention blocks the valve seat 113 by the spring 122 pressure. When power is applied to the solenoid, as the plunger 120 moves while compressing the spring 122, the valve structure 121 is separated from the valve seat 113 to open the valve seat 113, which is the same as the conventional art. have.

The structural features of the present invention are formed such that both the inlet side 111 and the outlet side 112 and the valve seat 113 of the housing 110 of the cut-off solenoid are aligned with each other, and the spring 122 It is characterized in that the plunger 120 for opening and closing the valve seat 113 at the tip end of the valve body 121 under pressure is also installed to operate along the traveling direction of the flow path from the inlet side 111 toward the outlet side 112. do.

In the present invention, reference numeral 123 in the drawing is a fuel passage hole formed in the plunger to pass the fuel, and 130 is a vaporizer.

In the present invention formed as described above, when power is not applied to the cut-off solenoid, the valve body 121 at the tip of the plunger 120 under the pressure of the spring 122 inside the housing 110 as shown in FIG. The sheet 113 is being blocked.

In this state, when power is applied to the solenoid, the plunger 120 is absorbed by the force of the electromagnet and moves while compressing the spring 122, and the valve body 121 installed at the tip thereof along the plunger 120 is also a valve seat. Since it is separated from the 113, the valve seat 113 is eventually opened as shown in Figure 4b.

As such, when the valve seat 113 is opened, the fuel flowing through the inlet side 111 passes through the fuel passage hole 123 formed at the center of the plunger 120 to the outlet side 112, and the inlet A portion of the fuel flowing from the side 111 proceeds in the direction of the portion where the valve body 121 at the tip is located through the gap between the inner circumferential wall of the housing 110 and the plunger 120 as shown in FIG. 5.

Thus, the tar introduced between the inner circumferential wall of the valve housing 110 and the plunger 120 is discharged to the outlet side 112 through the valve seat 113 together with the fuel by the pressure and flow of the fuel passing through the gap. After being sent to the carburetor 130, the tar introduced into the carburetor 130 is collected in the tar chamber attached to the second chamber of the carburetor 130, like the existing LPG vehicle, so that the vehicle driver should drain treatment every certain distance driving. .

As described above, in the present invention, tar is continuously generated inside the cut-off solenoid valve during long time running, and power is applied to the solenoid as described above even if the generated tar flows into a gap between the plunger and the inner wall of the housing. As long as the valve seat is opened, the tar, which has flowed into the gap between the inner circumference of the housing and the plunger, is discharged to the carburetor through the outlet side, so that the tar is stagnant and accumulated inside the valve like a conventional cut-off solenoid valve.

Therefore, if the cut-off solenoid valve of the present invention is used, there is no fear that the plunger of the valve will be inoperable due to the tar generated inside the valve every time the vehicle is operated, so that the starting failure is not generated, thereby increasing the consumer's reliability on the LPG vehicle. It can be effective.

Claims (1)

In the LPG vehicle, the valve body 121 at the tip of the plunger 120 subjected to the spring 122 pressure inside the cut-off solenoid valve housing 110 opens and closes the valve seat 113 depending on whether power is applied to the solenoid. In constructing a solenoid valve for fuel supply control, The inlet side 111 and the outlet side 112 of the cut-off solenoid housing 110 and the valve seat 113 are formed in a straight line with each other, and the plunger 120 receives the pressure of the spring 122. And the valve body 121 at the front end thereof is opened and closed while operating in the same direction along the advancing direction of the flow path from the inlet side 111 in the straight state toward the outlet side 112. Control solenoid valve structure.