JP2002147297A - Evaporated fuel treating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an evaporated fuel treating device of a structure not requiring long assembly time, capable of easily corresponding to a change in capacity of an adsorbing material or complication of a shape of an adsorbing material chamber. SOLUTION: Since the adsorbing material 2 is plurally divided, wrapped by a filter material 3a, and incorporated in the adsorbing material chamber 1a of an adsorbing device 1 as an adsorbing material cartridge 4, it is easily housed in the adsorbing material chamber 1a and it does not take time for incorporation. Also, the adsorbing material 2 does not leak outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an evaporative fuel processing apparatus for an internal combustion engine, and more particularly, to an evaporative fuel processing apparatus capable of preventing the adsorbent of an adsorbing device from leaking and improving assemblability. is there.

[0002]

2. Description of the Related Art When an engine is stopped, evaporated fuel slightly leaking from an injector or the like of a fuel injection device is adsorbed by an adsorbent filled in an adsorbing device provided on an inner wall of an intake passage, and is caused to flow by an intake air flow while the engine is running. Let me leave,
FIGS. 4 and 5 show a conventional evaporative fuel processing apparatus for burning in a combustion chamber. FIG. 4 is a longitudinal sectional view of a conventional evaporative fuel treatment apparatus, and FIG.
C. Referring to FIG.
An adsorbing device 24 is provided between the throttle body 22 and the air cleaner 23 provided in the middle of a. In FIG. 5, a cylindrical rib 25a substantially the same as the intake passage 21a is provided upright at the center of a cylindrical case 25 constituting the suction device 24, and an outer cylindrical portion 25b of the case 25 is provided.
Is filled with the adsorbent 2 via a gas-permeable filter 26 wound around the outer periphery of the rib 25a, and the cover 27 is attached to complete the adsorbent chamber 25c.

An inlet pipe 25d and an outlet pipe 27a provided at the openings of the case 25 and the cover 27 are used to connect the air cleaner 23 (FIG. 4) and the intake passage 21b (FIG. 4) on the throttle body 22 (FIG. 4) side. Connected. While the engine 21 (FIG. 4) is stopped, the injector 28
(FIG. 4), the evaporated fuel leaking from the intake passages 21a, 21a
1b (FIG. 4) to reach the suction device 24, and the rib 2
The light passes through the filter 26 through the gap 5a and is adsorbed by the adsorbent 2, thereby preventing the air from leaking from the air cleaner 23 to the outside. When the engine 21 operates, the intake passages 21a,
The fuel vapor adsorbed by the adsorbent 2 is desorbed by the intake air passing through 1b, and is burned in the combustion chamber 21c.

However, in the above-described adsorption device 24, when the adsorbent chamber 25c is filled with the adsorbent 2, it is difficult to confirm even if the filter 26 is turned up, and the adsorbent 2 is filled in the turned up state. In this case, there is a possibility that the adsorbent 2 leaks out with the lapse of use. Therefore, as a countermeasure, as shown in FIG. 6, after the adsorbent 2 is packed in a bag-shaped filter 31 made of a filter material 31a having air permeability, the inlet is sealed and the adsorbent cartridge 3 is closed.
2 and the adsorbent cartridge 32 is inserted into the adsorbent chamber 25c.
A suction device 33 of a type that is housed in a device is known. This type of adsorption device is also disclosed as a gas engine deodorizing device in Japanese Utility Model Application Laid-Open No. 7-17945. According to the publication, between an outer cylinder having a number of small holes formed on the peripheral side surface and an inner cylinder having similar small holes formed therein, a bag filled with activated carbon formed of filter paper, It is designed to be housed in a ring shape.

[0005]

However, in the above technique, it is necessary to manufacture adsorbent cartridges having different adsorbent capacities for different diameters of the intake passage, and various shapes are required depending on the volume of the adsorbent chamber. It is necessary to manufacture an adsorbent cartridge, and it takes time to design. In addition, since the capacity of the adsorbent is large, it is difficult to store the adsorbent in the adsorbent chamber, so that it takes time and trouble to assemble the adsorbent. Therefore, an object of the present invention is to provide an evaporative fuel processing apparatus that can easily cope with a change in the capacity of the adsorbent and a complicated shape of the adsorbent chamber and that does not require assembling time. It is assumed that.

[0006]

According to a first aspect of the present invention, there is provided an engine provided in an intake passage of an engine, wherein when the engine is stopped, fuel vapor generated in the intake pipe is adsorbed by an adsorbent. An adsorbent is divided into a plurality of parts, wrapped with a filter, and incorporated as an adsorbent cartridge in an evaporative fuel treatment apparatus for desorbing and burning adsorbed evaporative fuel when the engine is operating. The invention according to claim 2 is characterized in that the shape of the surface of the adsorbent cartridge is rectangular. The invention according to a third aspect is characterized in that the shape of the surface of the adsorbent cartridge is square. According to a fourth aspect of the present invention, the adsorbent cartridge according to the second aspect and the adsorbent cartridge according to the third aspect include the following.
It is characterized by being appropriately mixed and incorporated.

[0007]

As described above, according to the present invention, the fuel vapor generated in the intake passage while the engine is stopped is passed between the ribs of the adsorption device, passes through the filter, and is adsorbed by the adsorbent. Does not leak from the air cleaner to the outside. During operation of the engine, the adsorbed fuel vapor is desorbed by the intake air flowing through the intake passage and burned in the combustion chamber of the engine. Since the adsorbent is divided into a plurality of parts and wrapped by the filter, the adsorbent does not leak to the outside due to the turning of the filter as in the related art, and can be easily assembled even if the adsorbent chamber has a complicated shape.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1A shows a first embodiment of the present invention.
1B is a cross-sectional view of the adsorbent cartridge of the evaporative fuel treatment apparatus according to the embodiment, FIG. 1B is a cross-sectional view taken along the line AA, and FIG. In FIG. 1, an adsorbent 2 such as an activated carbon filled in an adsorbent chamber 1a of an adsorption device 1 is divided into an appropriate amount, and is divided by a filter 3 made of, for example, a non-woven fabric, a urethane material, a nylon material, a metal, etc. having air permeability. The adsorbent cartridge 4 is wrapped to form a rectangular shape. Since the rectangular adsorbent cartridge 4 is divided into a plurality, the adsorbent cartridge 4 can be housed in the cylindrical adsorbent chamber 1a of the adsorbing device 1 as shown in FIG. Next, a method for manufacturing the adsorbent cartridge 4 will be described with reference to FIG. The adsorbent cartridge 4 is shown in FIG.
As shown in (a), three sides of two rectangular filter materials 3a are welded or bonded on the surface side 4a to form a bag shape, and after the adsorbent 2 is packed from the inlet 3b, FIG.
As shown in (b), the inlet 3b is heat-welded or bonded by the heat-welding device 5 or the bonding device 6 to be completed. The dimension of the width side 4b of the adsorbent cartridge 4 is substantially equal to the width 1 of the adsorbent chamber 1a. FIG. 2D shows another embodiment of the filter 3 in which two sides of one filter material 3c are welded or bonded to form a bag-shaped filter 3A.

Next, a fuel vapor processing apparatus according to a second embodiment of the present invention will be described. FIG. 3A is a cross-sectional view of the adsorbent cartridge of the evaporative fuel treatment device according to the second embodiment of the present invention, and FIG.
(C), (d) and (e) are longitudinal sectional views of the suction device.
In FIG. 3, the adsorbent 2 filled in the adsorbent chamber 7a of the adsorption device 7 is divided into a suitable amount, and is wrapped by a filter 8 having air permeability to form an adsorbent cartridge 9. The adsorbent cartridge 9 is formed by filling the adsorbent 2 in a bag in which three sides of two square filter materials 8a are welded or bonded on the surface side 9a, and the inlet 8b is welded or bonded. Note that the method of manufacturing the adsorbent cartridge 9 is the same as that of the first embodiment, and will not be described.

Next, various forms of a suction device using the adsorbent cartridge 9 according to the present embodiment will be described. FIG. 3D shows a case in which the length of the adsorbent chamber 10a of the adsorbing device 10 is increased, and corresponds to an example in which the number of the adsorbent cartridges 9 is increased by the increased length. FIG. 3 (e)
Is a case where the adsorbent chambers 11a and 11b of the adsorbent device 11 are curved, and the adsorbent cartridge 9 is formed in a square shape on the surface side 9a and is divided.
Even when the shapes of a and 11b are curved, the adsorbent cartridge 9 can be housed neatly regardless of the complicated shape. In addition, since the adsorbent cartridge 9 is square on the surface side 9a, there is no need to distinguish between the vertical and horizontal directions, and it takes no time to assemble.

Although not shown, the above-described rectangular adsorbent cartridge and the square adsorbent cartridge are appropriately mixed and used, so that it is possible to incorporate the cartridge into an adsorption device having a more complicated adsorbent chamber. .

[0012]

The present invention has the following effects because it is configured as described above. That is, in the first aspect of the present invention, the adsorbent is divided into a plurality of parts, wrapped with a filter material, and incorporated as an adsorbent cartridge. improves. Also, the adsorbent does not leak out. According to the second aspect of the present invention, since the shape of the surface of the adsorbent cartridge is formed in a rectangular shape and the width is adjusted to the width of the adsorbent chamber, it can be easily and neatly assembled simply by arranging vertically. ,It does not take time and effort.

According to the third aspect of the present invention, since the shape of the surface of the adsorbent cartridge is formed to be square and the width is made to match the width of the adsorbent chamber, there is no need to distinguish between the vertical and horizontal directions. It is hard to be limited by the shape of the adsorbent chamber, and it can be neatly and easily accommodated even in a complicated curved adsorbent chamber,
The assemblability is further improved. Further, in the invention of claim 4, since vertically long rectangular and square adsorbent cartridges are appropriately mixed and incorporated, it is possible to accommodate the adsorbent device having an adsorbent chamber having a more complicated shape without any trouble. As a result, assemblability is improved, and the number of types of adsorbent cartridges can be reduced, which is advantageous in design and cost can be reduced.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of an adsorbent cartridge of an evaporative fuel treatment apparatus according to a first embodiment of the present invention. FIG. 1B is a cross section AA. FIG. 1C is a longitudinal sectional view of the suction device.

FIG. 2A is a front perspective view of a filter used for an adsorbent cartridge according to the first embodiment of the present invention. FIG. 2B is a top view at the time of heat welding of the filter.
FIG. 2C is a vertical cross-sectional side view of the filter during thermal welding. FIG. 2D is a front perspective view showing another embodiment of the filter.

FIG. 3A is a cross-sectional view of an adsorbent cartridge of an evaporative fuel treatment apparatus according to a second embodiment of the present invention. FIG. 3B is a cross section BB. FIG. 3C is a longitudinal sectional view of the suction device. FIG. 3D is a longitudinal sectional view of the suction device. FIG. 3E is a cross-sectional view of the suction device.

FIG. 4 is a longitudinal sectional view of a conventional evaporative fuel processing apparatus.

FIG. 5A is a longitudinal sectional view of an adsorption device of a conventional evaporative fuel treatment apparatus. FIG. 5B is a cross section CC.

FIG. 6A is a longitudinal sectional view of an adsorption device of a conventional evaporative fuel processing apparatus. FIG. 6B is a cross section DD.

[Explanation of symbols]

 2 adsorbent 3 filter 3a filter material 4 adsorbent cartridge 4a surface side 8 filter 8a filter material 9 adsorbent cartridge 9a surface side

Claims (4)

[Claims] 1. An evaporative fuel processing device provided in an intake passage of an engine, wherein the evaporative fuel generated in the intake pipe is adsorbed by an adsorbent when the engine is stopped, and the adsorbed evaporative fuel is desorbed and burned when the engine is operating. An evaporative fuel treatment apparatus wherein the adsorbent is divided into a plurality of parts, wrapped with a filter, and incorporated as an adsorbent cartridge. 2. The evaporative fuel treatment apparatus according to claim 1, wherein the surface of the adsorbent cartridge has a rectangular shape. 3. The evaporative fuel treatment apparatus according to claim 1, wherein the surface of the adsorbent cartridge has a square shape. 4. An evaporative fuel treatment apparatus, wherein the adsorbent cartridge according to claim 2 and the adsorbent cartridge according to claim 3 are appropriately mixed and incorporated.