JPH0414112Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a filter element that prevents vaporized gasoline from being released into the atmosphere from a carburetor in an automobile engine.

(Prior art) Some air cleaners used in gasoline engines have an adsorbent such as activated carbon installed in the element inside the air cleaner in order to adsorb vaporized gasoline emitted from the carburetor and prevent it from being released into the atmosphere. be. As an example of this, an air cleaner 20 shown in FIGS. 4 and 5 has a nonwoven fabric 24 wrapped around an inner cylinder 25 having holes, and a chrysanthemum-shaped overbody 22 formed by pleating a band of paper on the outside. An element 21 is installed in which an absorbent material 23 such as activated carbon paper is filled between each pleat of the overbody 22 and the nonwoven fabric 24, and end plates are provided at both ends of the absorbent material 23.

During operation of the engine, dust-containing air is sucked in through the intake port 26, and the dust is captured by the overbody 22, and only the purified air is sent to the engine through the supply port 27. When the engine is stopped, a large amount of evaporated gasoline generated in the intake manifold and carburetor due to engine residual heat flows into the air cleaner 21, is adsorbed by the adsorbent 23 filled in the element 21, and is released into the atmosphere from the intake port 26. This prevents

(Problem to be solved by the invention) However, this element 21 has a high ventilation resistance because the atmosphere always passes through the adsorbent 23 filled with the element 21, and furthermore, the fine diameter dust that has passed through the holes in the element 21 is absorbed into the adsorbent 23 and increases resistance, reducing engine output. In addition, the adsorbents move and come into contact with each other due to engine vibrations, producing abrasion powder that may be carried away by the intake air and clog the carburetor nozzle. Furthermore, since the adsorbent 23 is contained inside, the number of folds in the overbody 22 is reduced, resulting in the problem that the overbody 22 becomes clogged early.

(Means for solving the problem) An adsorption method in which activated carbon paper with a required number of corrugated grooves in the width direction is pleated and slitted leaving the edges on both sides of the peaks and troughs of each pleat. An adsorbent body with one or both sides slit is superimposed on an overbody made by pleating a strip material to form a chrysanthemum shape, and the adsorbent body is placed inside around an inner cylinder with holes, and the adsorbent body is placed on both ends of the body. An end plate was installed.

(Function) When the engine starts, air containing dust flows into the air cleaner from the air cleaner inlet.
It passes through the supernatant and reaches the adsorbent. At this time, dust is captured. The air that reaches the adsorbent flows along the uneven lines provided in the pleats, exits without resistance through the slits in the valleys of the pleats, and heads toward the engine through the supply port. When the engine is stopped, evaporated gasoline generated by the carburetor, etc. flows to the clean side of the air cleaner and passes through the slit of the adsorbent to reach the overbody, but is blocked by the overbody and is adsorbed on both sides of the adsorbent while remaining there.

(Example) In the air cleaner 1 shown in FIG. 1, an element 2 is disposed through a packing 7 in a housing formed by a casing 3 and a cover 4, which have an inlet 5 on the side wall and a supply port 6 on the bottom wall. It consists of being set up.

Element 2 has overbody 11 as shown in FIG.
It consists of an adsorbent 12 and an end plate 17. overbody 11
is made by pleating a strip of paper or nonwoven fabric to the required width. The adsorbent 12 is made of a band-shaped activated carbon paper 13 with a thickness of approximately 0.2 mm to 1 mm, and may be paper made by directly forming activated carbon fibers, activated carbon particles attached to the surface of sheet paper via a binder, or It is made from a mixture of activated carbon particles and natural pulp.
As shown in FIG. 3, a required number of corrugated stripes 14 are formed in the width direction. This activated carbon paper 13
is pleated to the same width as the overbody 11, and slits 15 are formed by leaving edges (approximately 5 mm) on both sides at the fold lines between the peaks and troughs of the pleats. slit 15
It is good to have only the valley side.

The adsorbent 12 is placed around the inner cylinder 16 having pores by aligning the pleat crests of the adsorbent 12, the pleats crests of the overbody 11, and the fold troughs and stacking them together.
The element 2 is formed by arranging the end plates 17 on the sides in a chrysanthemum shape, and arranging end plates 17 having an opening in the center at both ends thereof and fixing them with an adhesive. In addition, the pleat width of the absorbent body 12 is made longer so that the pleated ridges of the absorbent body 12 and the overbody 1
1, and form a gap in the pleat valley, or shorten the pleat width of the absorbent body 12, and align the pleat valleys of the overbody 11 and the absorbent body 12,
The adsorption area of the adsorbent 12 may be changed by forming gaps in the pleats.

(Effects) As described above, the present invention uses an adsorbent body in which slits are provided in the ridges and valleys of the porous inner cylinder, or in either one of the ridges and grooves, and the grooves are formed on the outside of the adsorbent body. Since the filter element has a folded overbody, after the intake air passes through the overbody, it flows along the uneven lines of the folds of the adsorbent, and flows out from the slits of the folded lines without resistance, which improves ventilation. resistance can be lowered. Furthermore, since both the overbody and the adsorbent are pleated and disposed around the inner cylinder, the pitches can be made finer, increasing the area and extending the life of the element. Since the adsorbent that adsorbs evaporated gasoline is made of activated carbon paper, it does not generate abrasion powder due to vibrations or the like, and does not clog the carburetor nozzle.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of an air cleaner equipped with the filter element of the present invention, Figure 2 is a partial cross-sectional perspective view of the filter element of the present invention, Figure 3 is an enlarged view of the adsorbent, and Figures 4 and 5 are FIG. 2 is a cross-sectional view of a conventional air cleaner and filter element. DESCRIPTION OF SYMBOLS 1... Air cleaner, 2... Filter element, 5... Suction port, 6... Supply port, 11... Overbody, 12... Adsorption body, 14... Uneven strip, 15...
Slits.

Claims (1)

[Scope of utility model registration request] An adsorbent that is made by pleating activated carbon paper with an overbody formed by pleating a material and an uneven strip forming a corrugated width in the width direction, and slits are provided in both or either of the pleat crests and troughs. A filter element is made up of a chrysanthemum-like structure in which adsorbents are placed inside around an inner cylinder having overlapping holes, and end plates are provided at both ends.