JP3232230B2 - Gas separation device in fuel supply path of internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a fuel supply path for supplying fuel in a fuel tank to a float chamber of a carburetor of an internal combustion engine, such as air in the fuel supply path or fuel vapor. The present invention relates to an apparatus for separating gas.

[0002]

2. Description of the Related Art In general, fuel pumped from a fuel tank by a fuel pump contains gas such as air or fuel vapor. Since gas will accumulate in the float chamber of the vessel, it is necessary to provide a gas separation device for separating gas in the fuel in the fuel supply path.

[0003] In this case, a conventional gas separation device is, for example, as disclosed in Japanese Utility Model Laid-Open No. 55-97166, etc. A fuel introduction socket tube for introducing fuel from a fuel pump into the closed container, a fuel outlet socket tube for a float in a vaporizer at a lower portion of the closed container, and a fuel By providing a socket tube for return to the tank, the fuel pumped from the fuel tank by the fuel pump is introduced into the sealed container from the fuel introduction socket tube, the gas in the fuel is separated, and the separated gas is separated. While returning from the upper return socket pipe to the fuel tank, the separated fuel is supplied from the lower fuel outlet socket pipe to the float chamber in the vaporizer. There.

[0004]

However, this conventional gas separation apparatus has a fuel inlet socket pipe, a return socket pipe, and a fuel outlet socket pipe provided on the side surface of a closed vessel. The socket pipes project laterally from the side surface of the closed container, so that, on the side of the closed container, a fuel line from a fuel pump is provided for each of the laterally projecting socket pipes;
Since it is necessary to secure a space for inserting and removing the return line to the fuel tank and the fuel line to the float chamber of the vaporizer, there is a problem that a large space is required for installing the gas separation device.

Further, since the fuel introduction socket pipe, the return socket pipe, and the fuel outlet socket pipe for the sealed container are configured to project from the side surface of the sealed container, each of the socket pipes is subjected to impact. There was also a problem that breakage easily occurred. It is a technical object of the present invention to provide a gas separation device that solves these problems.

[0006]

SUMMARY OF THE INVENTION In order to achieve this technical object, the present invention provides a fuel tank for introducing fuel from a fuel pump into a vertical cylindrical closed container. In a gas separation device provided with an inlet socket tube, a fuel outlet socket tube to a float in a vaporizer, and a return socket tube to a fuel tank, the return socket tube faces downward on the bottom surface of the closed container. Provided so as to protrude, and further provided with a concave portion from the side surface at the bottom of the closed container, and within the concave portion, the fuel introduction socket tube is provided so as to protrude downward,
The fuel outlet socket pipe is provided so as to protrude laterally, while a communication pipe which opens the return socket pipe at an upper portion in the closed vessel is provided in the closed vessel, and the fuel introduction socket pipe is provided in the closed vessel. A fuel introduction pipe is provided at an upper portion of the fuel injection pipe, which is opened at a position lower than the upper end of the communication pipe by an appropriate dimension. ".

[0007]

In this configuration, the fuel from the fuel introduction socket tube to the inside of the closed container flows into a relatively high portion of the closed container through the fuel introduction tube, and then flows into the closed container at the bottom. Since it flows out from the fuel outlet socket tube, during this time, gas such as air and fuel vapor in the fuel is separated so as to accumulate in the closed container at the upper portion. Then, the gas separated at the upper part in the sealed container is returned to the fuel tank from the communication pipe and the return socket pipe.

In this case, the return socket tube is provided so as to protrude downward from the bottom surface of the closed container, and a concave portion is provided at the bottom of the closed container from the side, and the concave portion is provided in the concave portion. By providing the fuel introduction socket tube so as to protrude downward, and by providing the fuel outlet socket tube so as to protrude laterally, each of the fuel introduction socket tube, the return socket tube and the fuel outlet socket tube, It can be collected at the bottom of the sealed container so as not to protrude from the side surface of the sealed container, or with the protrusion from the side surface reduced.

Therefore, according to the present invention, while the gas can be reliably separated from the fuel, the space required for providing the gas separation device can be greatly reduced, and the fuel introduction socket for the closed container can be provided. This has the effect that the occurrence of breakage in the pipe, return socket pipe and fuel outlet socket pipe can be reliably reduced.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. In this figure, reference numeral 1 denotes a vertically sealed cylindrical container made of a synthetic resin, which is a lower container 2 having a bottom plate 2a and an upper container 3 having a lid plate 3a. The upper container 3 is joined to the lower container 2 by an adhesive or friction welding.

A return socket tube 4 is integrally provided at a substantially central portion on the bottom surface of the closed container 1 so as to protrude downward. A recess 5 from the side surface is provided on the bottom surface of the sealed container 1, and a fuel outlet socket tube 6 is integrally provided on the side plate 5 a in the recess 5 so as to protrude laterally. I have. Also,
A fuel introduction socket tube 7 is provided integrally with the ceiling plate 5b in the recess 5 so as to protrude downward.

The return socket tube 4 includes:
A hose (not shown) for returning to the fuel tank, a hose (not shown) for supplying fuel to a float chamber in the vaporizer at the fuel outlet socket tube 6, and a hose (not shown) for supplying fuel to the float chamber in the vaporizer are provided at the fuel inlet socket tube 7. A hose (not shown) for supplying fuel from the fuel pump is inserted and connected. On the other hand, a communication pipe 8 for opening the return socket pipe 4 into the upper part of the closed vessel 1 is integrally provided in the closed vessel 1, and the fuel introduction socket pipe 7 is connected to the communication pipe 8. A fuel introduction pipe 9 is provided integrally with the inside of the closed vessel 1 so as to open to a portion lower than the upper end of the communication pipe 8 by an appropriate dimension L.

As shown in FIG. 4, a throttle orifice 10 for regulating the flow rate is provided in the communication pipe 8 in the middle thereof.
Is provided. In this configuration, the fuel from the fuel introduction socket tube 7 into the closed container 1 flows into a relatively high portion of the closed container 1 via the fuel introduction tube 9, and then the fuel outlet at the bottom of the closed container 1. Since the fuel gas flows out of the socket tube 6, during this time, gas such as air and fuel vapor in the fuel is separated so as to accumulate in the sealed container 1 at the upper portion. Then, the gas separated at the upper part in the closed vessel 1 is returned to the fuel tank from the communication pipe 8 and the return socket pipe 4.

In this case, as shown in FIGS. 2 and 3, the passage 9a in the fuel introduction pipe 9 is formed in a tapered shape so that the upper end thereof has an elliptical shape long in the circumferential direction of the closed casing 1. As a result, fuel flows out of the passage 9a in the fuel introduction pipe 9 in a direction indicated by an arrow A in FIGS. 2 and 3, and flows into the closed container 1 as shown by an arrow B in FIG. Can be provided. By providing the swirling flow, the flow distance of the fuel from the fuel introduction pipe 9 to the fuel outlet socket pipe 6 is increased, so that the reliability of separating the gas from the fuel can be improved, and the fuel can be removed from the sealed container 1. Has the advantage that it can be warmed by heat transfer.

Further, as in the above embodiment, the closed container 1
Are composed of a lower container 2 and an upper container 3 which are joined to each other by an adhesive or friction welding, and a fuel introduction socket tube 7, a return socket tube 4, a fuel outlet socket tube 6, With the structure in which the communication pipe 8 and the fuel introduction pipe 9 are integrally provided, the entire closed container 1 can be manufactured by injection molding using a synthetic resin. It is possible to achieve a reduction in weight and a reduction in manufacturing cost as compared with the conventional case of casting.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the present invention.

FIG. 2 is a plan sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a view showing a throttle orifice provided in the middle of the communication pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Lower container 3 Upper container 4 Return socket tube 5 Depression 6 Fuel outlet socket tube 7 Fuel introduction socket tube 8 Communication tube 9 Fuel introduction tube

Claims (1)

(57) [Claims] 1. A fuel introduction socket tube for introducing fuel from a fuel pump into the closed container formed in a vertically cylindrical closed container, a fuel outlet socket tube for a float in a carburetor, In a gas separation device comprising a return socket tube to a fuel tank, the return socket tube is provided on the bottom surface of the closed container so as to protrude downward, and further, a side surface is provided on the bottom of the closed container. A recess is provided, and within the recess, the fuel introduction socket tube is provided so as to protrude downward, and the fuel outlet socket tube is provided so as to protrude laterally.
In the closed container, a communication pipe that opens the return socket tube at an upper portion in the closed container is provided, and the fuel introduction socket tube is appropriately lower than the upper end of the communication tube in the upper portion of the closed container. A gas separation device in a fuel supply path of an internal combustion engine, wherein a fuel introduction pipe that opens at a portion is provided.