JPH0247254Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention A-1. Industrial application field This invention collects evaporated fuel from a fuel supply source such as a fuel tank or a vaporizer in a vehicle to prevent air pollution. This invention relates to a vaporized fuel collector, a so-called canister.

A-2 Prior Art Conventionally, as shown in FIG. 3, as shown in FIG.
A widely used system is one in which the adsorbed fuel vapor is adsorbed to an adsorbent within the internal combustion engine, and the adsorbed fuel vapor is separated from the adsorbent during operation of the internal combustion engine and is supplied to the engine from a vaporizer 5 or the like through a fuel vapor discharge passage 4. In such a collector, in order to improve the utilization of the adsorbent contained therein, as shown in FIGS. 4 and 5, the evaporative fuel introduction pipe 6 is buried in the adsorbent material 7 so as to protrude from the absorbent material 7. A flow deflector 8 in the shape of an inverted cone is buried in the adsorbent layer 7 at the outer periphery of the evaporated fuel introduction pipe 6 to control the flow of evaporated fuel in the adsorbent during adsorption. For example, JP-A-56-69455 and JP-A-57 disclose attempts to effectively use adsorbents over a wide range by dispersing them as shown by arrow A in the figure.
-Disclosed in Publication No. 157053.

A-3 Problems to be solved by the present invention In the conventional collector described above, evaporated fuel is effectively adsorbed over a wide range during adsorption, but when the engine is operating, the passes through the second diffusion chamber 10 to the perforated plate 11 and filter 12
is introduced into the adsorbent layer 7, and then, as shown by the broken line B in FIG.
Since the air flows out from the purge port 16 through the first diffusion chamber 15, the above-mentioned air flow does not occur in the area shown by C in the flow deflector 8. Therefore, there is a problem that the evaporated fuel adsorbed by the adsorbent in this region C is not released, and the regeneration efficiency of the adsorbent becomes insufficient, resulting in a worsening of the next adsorption efficiency. Therefore, in this study, in an engine equipped with a flow deflection body having the shape described above, the air introduced during engine operation is made to flow through the adsorbent layer in the region inside the flow deflection body. The purpose of this project is to improve the regeneration efficiency of water and propose a collector with high adsorption efficiency.

B. Structure of the invention B-1 Means for solving the problem In order to solve the above-mentioned problem, the present study aims to solve the above-mentioned problem by burying the evaporated fuel inlet pipe 6 with its opening buried in the adsorbent layer 7 inside the vessel. In addition, a flow deflector 8 having an opening on the insertion side of the evaporated fuel introduction pipe 6 is provided in the adsorbent layer 7.
The opening for the adsorbent layer 7 in the purge port 16 communicating with the engine is buried in the adsorbent layer included in the flow diverter 8. It is characterized by:

RO-2 Effect The evaporated fuel introduced when the engine is stopped flows through the evaporated fuel introduction pipe 6 into the adsorbent layer 7 in the flow deflector 8.
Then, after rising inside the flow deflection body 8, it flows out to the outer circumference of the flow deflection body 8 and descends.
The air that flows in during engine operation flows out of the purge port 16 into the engine through a flow opposite to the flow described above, and also removes the evaporated fuel adsorbed on the adsorbent layer 7 included in the flow deflector 8. and discharge it to the engine.

RO-3 Embodiment In the embodiment shown in FIG.
and a first diffusion chamber 1 located above the adsorption layer 7 and separated from the adsorption material layer 7 by a partition plate 19 made of a non-porous plate.
5, and a filter 1 located below the adsorbent layer 7.
3. Second diffusion chambers 10 separated by a perforated plate 14 are provided. Reference numeral 6 denotes an evaporative fuel inlet pipe, and a filter 20a is connected to an inlet port 20 whose upper end communicates with a evaporative fuel extraction hole of a fuel tank or a vaporizer.
The lower end is buried in the adsorbent layer 7 and is open. A purge port 16 communicates with the engine, and its tip opens into the first diffusion chamber 15. Reference numeral 21 denotes a cylindrical guide wall fixed to the partition plate 19 so as to form a purge passage 22 around the outer periphery of the fuel vapor introduction pipe 6, and its lower end is located below the adsorbent layer 7. The upper end of the purge passage 22 has an outflow hole 2 in the partition plate 19.
3 and is provided with a filter 23a, which communicates with the first diffusion chamber 15. Reference numeral 8 denotes a flow deflector having an inverted conical shape, and is installed so as to surround the lower part and the outer periphery of the guide wall 21 at a distance. The flow deflector 8 is maintained in its installed state by appropriate means such as supporting legs 24. Reference numeral 9 is an air port, 10 is a second diffusion chamber, 11 is a perforated plate, and 12 is a filter, which are the same as those in the conventional structure.

In this embodiment, when the engine is stopped, the filter 20a and the vaporized fuel inlet pipe 6 are connected to the inlet port 20.
The vaporized fuel introduced into the adsorbent layer 7 through
As shown by the solid arrow A in FIG. 1, it flows out from the lower end opening of the guide wall 21 to the outer periphery, then rises inside the flow deflection body 8, and then flows out from the upper end opening,
Then it descends. Therefore, as in the past, the flow of the vaporized fuel can be changed and the vaporized fuel can be effectively adsorbed on a wide range of adsorbents. Next, when the engine is operated, the negative pressure generated within the engine acts on the purge port 16, and the suction force caused by this negative pressure causes air to be sucked through the atmosphere port 9, and the air is transferred to the first diffusion port 16. It is introduced into the adsorbent layer 7 through the chamber 10, the porous plate 11, and the filter 12. The introduced air then flows through the purge passage 2.
Since the lower end opening of 2 is located at the lower part of the guide wall 8, as shown by the broken line B in FIG.
After that, it flows into the first diffusion chamber 15 through the purge passage 22, the filter 23a, and the outflow hole 23, and is introduced into the engine through the purge port 16. Therefore, the evaporated fuel that has been collected in the adsorbent layer 7 is separated from the adsorbent layer 7 by the circulating air as described above and flows out to the engine, and is also particularly distributed inside the flow deflector 8. Therefore, the evaporated fuel adsorbed on the adsorbent layer 7 in the flow deflector 8 can also be released and flowed out.

Next, a second embodiment of the present invention shown in FIG. 2 will be described. In this embodiment, the purge port 16 is arranged near the introduction port 20, the purge passage 22a is directly provided at the lower end of the purge port 16, and the lower end opening of the purge passage 22a is connected to the adsorbent layer 7 that the flow deflector 8 includes. It was buried to the bottom. The other structure is the same as that of the first embodiment. In this embodiment, the evaporated fuel is introduced as shown by the solid line arrow A in the figure, and the air flows as shown in the broken line arrow B in the figure, and the same functions and effects as in the previous embodiment are achieved.

C. Effect of the invention As described above, according to the invention, the air that releases the evaporated fuel adsorbed on the adsorbent layer also acts on the inside of the flow deflection body, so that the adsorbent contained in the flow deflection body It is also possible to scavenge vaporized fuel adsorbed in the layer.
Therefore, as shown in Fig. 6, the evaporated fuel detached weight A according to this study is larger than that of the conventional one B, the detachment performance is improved, the regeneration efficiency of the adsorbent is improved, and a trap with high adsorption efficiency is achieved. I can suggest a collector.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional perspective views showing two embodiments of the present invention, Figure 3 is a diagram showing an evaporative fuel system in which the collector of the present invention is installed, and Figures 4 and 5 are Each cross-sectional perspective view showing the conventional structure, FIG. 6 is a characteristic diagram comparing the weight of evaporated fuel between the present invention and the conventional structure. 6... Evaporated fuel introduction pipe, 7... Adsorbent layer, 8...
...Flow deflector, 16...Purge port, 20...
Introduction port, 22, 22a... purge passage.

Claims (1)

[Scope of utility model registration request] The evaporative fuel introduction pipe 6 is provided so that its opening is buried in the adsorbent layer 7 inside the vessel, and
In the adsorbent layer 7, flow deflectors 8, which are open on the insertion side of the fuel vapor introduction pipe 6, are installed facing each other so as to surround the outer periphery of the buried part of the fuel vapor introduction pipe 6. port 1
6. A vaporized fuel collector characterized in that the opening for the adsorbent layer 7 in 6 is embedded in the adsorbent layer included in the flow deflector 8.