JPH07694Y2 - Fuel vapor collector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a fuel vapor collection device for collecting fuel vapor generated from a fuel tank of an automobile and preventing the fuel vapor from being released into the outside air.

(Prior Art) The fuel vapor collection device includes an adsorbent container filled with a fuel vapor adsorbent such as activated carbon, and a fuel vapor inlet port leading to a fuel supply source such as a fuel tank is provided at the top end of the container. The structure is such that a fuel vapor lead-out port communicating with the intake system of the engine is provided and an outside air introducing port communicating with the outside air is provided at the bottom end.

Then, when the engine is stopped, the fuel vapor introduced from the fuel tank or the like through the fuel vapor inlet into the container is adsorbed by the vapor adsorbent and prevented from being released into the outside air. The fuel vapor introduced from the outside air inlet into the container and adsorbed on the adsorbent is separated from the adsorbent and sent to the intake system.

By the way, in the fuel vapor collecting device having the above structure, there is a possibility that water, muddy water, dust, and the like may enter from the outside air introduction port together with air.

Therefore, measures are taken to extend the outside air introduction hose 101 as shown in FIG. 5 from the outside air introduction port 102 and insert the tip thereof into the box-shaped body frame 103. The vehicle body frame 103 is a substantially closed structure having a small gap or hole through which air enters and leaves, and the air from the outside air inlet 102 to the adsorbent container 100 via the hose 101 contains almost no muddy water or dust. It has a special feature.

However, since it is not completely sealed, a small amount of muddy water may enter the body frame 103 and also the hose 101. Considering this point, it is necessary to arrange the hose 101 on the downward slope toward the vehicle body frame 103.

In addition, in Japanese Utility Model Publication No. 61-167459, a cover is attached to the bottom end of the container to form a closed chamber between the two, and an outside air intake is provided on the bottom of the cover so that the outside air intake Even if air containing water etc. is taken in, it is proposed to remove it in the process of passing through the closed chamber and reaching the outside air introduction port,
Further, it has been proposed that a large number of partition walls are provided in the cover body to form a labyrinthine passage between the outside air intake port and the outside air introduction port to improve the adhesion efficiency of water and the like.

(Problems to be solved by the invention) However, in the fuel vapor collection device with the gradient hose, the fuel vapor collection device must be placed at a position higher than the body frame, and the fuel vapor collection device between the body frame and the fuel vapor collection device Problems such as many restrictions on mutual positions are occurring.

Further, in the fuel vapor collecting device of Japanese Utility Model Laid-Open No. 61-167459, the cover has an extremely complicated structure because it forms a maze.

(Means for Solving the Problems) In order to solve the above problems, the present invention connects a bottom cap to the lower portion of the adsorbent container. The bottom cap has a bottom plate tilted with respect to a horizontal plane, and an intermediate partition plate tilted in the opposite direction to the bottom plate is provided above the bottom plate and below the adsorbent container, and the bottom corners of the bottom plate and the middle partition plate are provided. Each section is provided with an outside air introduction port and a ventilation port.

Further, on the upper surface of the partition plate, a plurality of radial ribs extending around the vent hole are provided upright.

(Function) Most of the muddy water that has entered from the outside air inlet of the bottom cap bottom plate flows down along the slope on the bottom plate and is discharged from the outside air inlet, and some muddy water that has risen through the vent and entered It flows down on the partition plate along its inclination and is discharged through the vent hole and the bottom plate.

Further, the outside air introduction port introduced through the outside air introduction port and the ventilation port uniformly enters the adsorbent container by the radiating rib.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional side view of a fuel vapor collection device according to the present invention.

The fuel vapor collection device 1 includes, for example, a fuel vapor introduction port 3 leading to a fuel tank at the top end 2a of an adsorbent container 2 filled with activated carbon C, a fuel vapor introduction port 4 leading to a float chamber of a carburetor, and an intake system of an engine. A filter 6 for supporting activated carbon C is provided on the lower portion 2b of the adsorbent container 2, which is provided with a fuel vapor introducing port 5 which communicates with the adsorbent container 2, and a grid 7 is provided under the filter, and a dust filter 8 is arranged below the grid. A bottom cap 10 for introducing outside air is placed below the dust filter, and the bottom cap is connected to the adsorbent container 2. In this embodiment, the grid 7 is fitted in the container 2, and the grid supports the filter 6 and the activated carbon C.

The bottom cap 10 is a bottomed cylindrical body composed of a bottom plate 11 and a cylinder 12, and the bottom plate 11 is inclined downward to the left in the drawing and is shown above the bottom plate 11 and below the adsorbent container 2. It has a middle partition plate 13 that has a downward slope to the right. The bottom cap 10 is a water trap S in the space below the partition plate 13.
1, and the space above the partition plate 13 is divided into dust traps S2.

An outside air introduction port 14 is opened at the lower corner 11a of the bottom plate 11.

The outside air introduction port 14 has a protruding pipe 14a protruding downward from the lower surface of the bottom plate 11, a barrier 14b protruding upward from the upper surface of the bottom plate 11 in a U-shaped cross section in a plan view, and a rib 14c protruding from the upper end of the barrier to the air passage side. And a rib 14d projecting toward the air passage side at the base end of the projection tube.

In the figure, 15 and 15 are ribs that stand upright on the upper surface of the bottom plate 11. These ribs 15 and 15 are expanded in a V shape around the outside air inlet 14 as shown in FIG.

Further, as shown in the figure, the ribs 14c and the ribs 14d related to the outside air introduction port 14 face each other and close about half of the air passage, so it is difficult to face the partition plate 13 through the projection tube 14a.

The partition plate 13 has a lower end portion 13 as shown in FIG.
The vent 16 is opened in a. The ventilation port 16 has a protrusion 16 protruding downward from the lower surface of the partition plate 13 and having a U-shaped cross section in plan view.
a, and the lower end of this protrusion is closed by a rib 16b.

On the left side of the vent hole 16 in the figure, ribs 17 ... Stand upright on the partition plate 13. These ribs are radial ribs arranged radially around the vent hole 16 as shown in FIG. 3 which is a sectional view taken along the line BB of FIG.

Reference numeral 18 denotes a sub-outside air introduction port, which is a nozzle extending in the tangential direction of the cylinder 12 of the bottom cap as shown.

The operation of the fuel vapor collection device having the above configuration will be described below.

FIG. 4 is an operation diagram. When the fuel vapor pressure in the fuel tank exceeds a certain value while the engine is stopped, the check valve 19a opens and the fuel vapor enters the container through the fuel vapor inlet 3. Similarly, the fuel vapor in the carburetor float chamber will be discharged from the check valve 19b.
Through the fuel vapor inlet 4 into the container 2.

These fuel vapors are absorbed and accumulated in the activated carbon C in the container.

Check valve when the engine starts and the negative pressure in the intake system increases
19c is opened, the check valves 19a and 19b are closed, and the fuel vapor accumulated in the activated carbon C is sucked into the intake system. At this time, the outside air is sucked into the container 2 through the outside air inlet 14 according to the negative pressure inside the container 2.

That is, this outside air enters the projection tube 14a of the outside air introduction port shown in FIG. 1, collides with the ribs 14d and 14c while being raised, and is deflected before reaching the water trap chamber S1.

The outside air that has exited the outside air introduction port 14 traverses the water trap chamber S1 and reaches the ventilation port 16 located on the opposite side. Since the back surface of the protruding portion 16a and the rib 16b obstruct the ventilation hole 16, the air largely bypasses and then passes through the ventilation hole 16 and enters the dust trap chamber S2.

In the dust trap chamber S2, the air rises while being evenly dispersed by the radial ribs 17 ... And enters the dust filter 8.

Clean air from which dust and the like has been removed reaches the activated carbon C through the dust filter 8, the grid 7 and the filter 6.

Since the bottom cap 10 has the above-mentioned configuration, even if mud should enter through the outside air inlet 14, most of it will be blocked by the ribs 14d and 14c.

Then, the residual water is blocked by the protruding portions 16a and the ribs 16b of the ventilation port, and most of it falls on the bottom plate 11.

In addition, a small amount of residual water that has passed through the vent 16 will not be removed by the partition plate 13.
Fall on.

The water on the middle partition plate 13 is collected in the ventilation port 16 of the lower corner portion 13a because the middle partition plate is inclined, and falls from the ventilation port 16 onto the bottom plate 11.

The water on the bottom plate 11 is made to flow along the slope of the bottom plate, and the water flows in the plan view V.
It is guided by the ribs 15, 15 to reach the lower corner 11a, and the barrier 14b
Is discharged from the outside air introduction port 14 to the lower part of the bottom cap 10 through the side of.

Further, since the outside air introduction port 14 and the ventilation port 16 are provided at both ends in the radial direction of the bottom cap 10, the dust and the like that have entered from the outside air introduction port 14 move while folding back over a long distance, and the dust and the like are caught between the bottom plate. It can be dropped onto the partition 11 or the partition plate 13, and therefore intrusion of dust and the like can be efficiently prevented.

The sub-outside air introduction port 18 provided in the dust trap chamber S2 may be blind with a cap (not shown), or if there is a substantially closed space in the vicinity, air may be introduced from this space. good.

(Effects of the Invention) As described above, the present invention provides the outside air inlet and the ventilation hole at both ends of the bottom cap in the radial direction so that dust and the like entering from the outside air inlet can be folded back and moved over a long distance. Therefore, the fuel vapor collection device is strong against intrusion of muddy water,
Therefore, the fuel vapor collection device can be arranged at an extremely free height.

In addition, the bottom cap has a simple structure and is extremely easy to manufacture.

Further, since the air can be made to uniformly enter the dust filter by employing the radial ribs, the radial cross section of the fuel vapor collection device can be effectively utilized.

[Brief description of drawings]

FIG. 1 is a sectional side view of a fuel vapor collection device according to the present invention, FIG.
The drawing is a view taken in the direction of arrow A in FIG. 1, FIG. 3 is a sectional view taken along the line BB in FIG. 1, FIG. 4 is an operation view, and FIG. 1 ... Fuel vapor collection device, 2 ... Adsorbent container 2a ... Vessel top end, 2b ... Container lower part 3,4 ... Fuel vapor inlet port 5 ... Fuel vapor outlet port, 10 ... Bottom cap 11 ... Bottom plate, 11a ... Lower corner 13 ... Middle partition, 13a ... Lower corner 14 ... Outside air inlet, 16 ... Vent 17 ... Radial rib

Claims (2)

[Scope of utility model registration request] 1. An adsorbent container filled with a fuel vapor adsorbent is provided with a fuel vapor inlet port leading to a fuel tank or the like and a fuel vapor outlet port leading to an intake system of an engine, and below the adsorbent container. In a fuel vapor collection device connected to a bottom cap capable of introducing outside air into the container, the bottom cap has a bottom plate inclined with respect to a horizontal plane, and above the bottom plate and in the adsorbent container. A fuel vapor collection device, characterized in that a middle partition plate that is tilted in the opposite direction to the bottom plate is provided below, and an outside air introduction port and a ventilation port are provided at the lower corners of the bottom plate and the middle partition plate, respectively. 2. The fuel vapor collection device according to claim 1, wherein a plurality of radial ribs extending around the vent hole are provided upright on the upper surface of the partition plate.