JPS5928119Y2 - air cleaner - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a dry air cleaner mainly for use in internal combustion engines.

Generally, in a dry air cleaner, as shown in Fig. 1, the inlet pipe 2 is attached to one end plate 1a, and the inlet pipe 2 is attached to the other end plate 1a.
An annular filtration element 4 with a chrysanthemum-shaped flap is housed inside a cylindrical case 1 to which an outlet pipe 3 is attached at b, so as to form an air passage 1c between the filtration element 4 and the case 1. Outside air is sucked into the cylindrical case 1 from the inlet pipe 2, and is passed through the filtration element 4 from the air passage 1C to remove dust contained in the outside air, and only the purified air is passed through the filtration element 4. The fuel is collected inside the engine and sent to the internal combustion engine through the outlet pipe 3.

By the way, in this conventional type, since the outside air is processed by a single filter element 4, the filtering element 4 receives the outside air containing dust particles of various sizes in a disorderly manner, Dust tends to adhere to the entire surface, leading to premature clogging and potentially shortening the life of the filtration.

This idea was made to solve the above-mentioned drawbacks, and uses a first filtration element with fine dead mesh and a second filtration element with normal dead mesh, and the first filtration element filters out a lot of the outside air containing fine dust. To provide an air cleaner in which the second filtration element filters outside air containing coarse dust to prevent clogging of the second element, extend its life, and improve filtration efficiency.

Referring to FIG. 2, an embodiment of this invention will be described. Reference numeral 11 is a cylindrical case of a required size, and an end plate 1 is provided with an inlet pipe 12 at one end, as in the conventional case.
1a is attached and swung by a plurality of clamp members C, and an end plate 11b having an outlet pipe 13 is attached to the other end, and the outlet pipe 13 is appropriately connected to the engine body (not shown).

By the way, inside the cylindrical case 11, there is a cylindrical first filtration element 14 with a slightly finer dead mesh than a general filter element, and a cylindrical 20th filter element 15 with the same diameter but a normal dead mesh. The first filter element is housed along the axis of the cylindrical case 11 so as to be placed on the side of the inlet pipe 12, and both filter elements 14 and 15 are made of strip material whose leg ends are fixed to the outlet pipe 13. An annular packing material 17 is fitted into a U-shaped support frame 16 consisting of
a, 17b are provided, a cover plate 18 of the first filter element 14 is screwed to the head end of the support frame 16, and both filter elements 14 and 15 are supported in the cylindrical case 1.

Further, a bell-shaped guide tube 19 that is slightly larger than the first filter element 14 is disposed on the outside of the first filter element 14, and this guide tube 19 has a neck portion 19a extending into the inlet pipe 12.
A shoulder portion 19b that extends into the cylindrical case 1 and has a plurality of spacers 20 at intervals on the inner surface, and a body portion having a plurality of inward protrusions 21 at intervals in the circumferential direction at the center of the inner surface. 19c, a coil spring 22 is provided between the outer surface of the shoulder portion 19b and the end plate 11a on the inlet pipe 12 side, and the spacer 20 is placed on the cover plate 18 of the first filter element 14. The inward protrusion 21 of the body 19c is in pressure contact with the first filter element 1.
One annular air passage A is formed between the guide cylinder 19 and the first filtration element 14, and further between the guide cylinder 19 and the cylindrical case 11 and the second Another air passage B is formed between the filter element 15 and the cylindrical case 11.

Inside the inlet pipe 12, a guide vane 23 for separation is located in front of the neck 19a of the guide tube 19.
is provided.

In its use, when the outlet pipe 13 is connected to the intake system of an internal combustion engine and the engine is operated, outside air containing various types of dust is sucked in through the inlet pipe 12, and the outside air is absorbed by passing through the guide vane 23 in the pipe. is given swirling properties, and is divided into an airflow containing coarse dust and an airflow containing fine dust. The coarse dust enters the cylindrical case 1 through the air passage B outside the guide tube 19, reaches the outer circumference of the 11i2 filter element 15, and crosses the second filter element 15. The trapped and dust-free air is sent through the outlet pipe 13 to the engine intake system.

At this time, an air permeable cake layer is formed on the surface of the second filter element 150 due to coarse dust.

On the other hand, the air flow containing fine dust enters the guide cylinder 19 from the neck part 19a as indicated by arrow Y, passes through the air passage A between the guide cylinder 19 and the first filter element 14, and most of the air flows through the air passage A. The air passes through a small first filtration element 14, where fine dust is removed, and the purified air exits to the center and joins the air treated by the second filtration element 15 toward the outlet pipe 13. heading to

In this case, the first filtration element 14 processes less dust than the conventional filter, but due to its small diameter, it becomes clogged over time.

As the clogging progresses and the ventilation resistance of the first filter element 140 increases, the airflow containing fine dust will flow through the guide tube 19.
The air flows through the air directly toward the second filtration element 15 with less pressure loss, and crosses the second filtration element 15 side by side with the air flow containing coarse dust.

However, at that time, a cake layer of coarse dust has already been formed on the second filtration element 15, and the fine dust is captured by this cake layer, so the filtration efficiency is improved, and the fine dust is filtered through the second filtration element 15. Since it does not directly adhere to the element 15, the second filtration element is less likely to become clogged and has a longer lifespan.

As described above, in this invention, a first filter element with a fine mesh and a second filter element with a normal mesh are arranged side by side along the axis in a cylindrical case, and a guide vane for separation is installed in the inlet pipe. The outside air sucked into the inlet pipe is divided into an airflow containing coarse dust and an airflow containing fine dust, and the airflow containing coarse dust is filtered by a normal second filter element, which contains fine dust. Since the airflow is filtered through the first filtration element with fine pores, it is possible to prevent clogging of the second filtration element, which normally has pores, and significantly extend the life of the air cleaner compared to conventional ones. In addition, dust retention is good and filtration efficiency can be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional air cleaner. FIG. 2 is a sectional view of an embodiment of this invention. In the figure, 11... Cylindrical case, 12...
・Inlet pipe, 13... Outlet pipe, 14... First filtration element, 15...-
...Second filtration element, 16...-support frame, 19...guide tube, 19a...neck,
19b...shoulder part, part, 23...guide vane. 19c... Torso

Claims (1)

[Scope of utility model registration request] Inside a cylindrical case 11 equipped with an inlet pipe 12 at one end and an outlet pipe 13 at the other end, a first filtration element 14 having a cylindrical shape with fine dead meshes and a second filtration element 14 having a cylindrical shape with normal dead meshes are provided. Element/H5 to 1st element 1
A bell-shaped guide consisting of a neck 19a, a shoulder 19b and a body 19c is arranged on the outside of the 10th filtration element 14 along the axis of the case 11 so that the 10th filtration element 14 is on the side of the inlet pipe 12. A cylinder 19 is provided, and one air passage A is formed between the guide cylinder 19 and the first element 14, and another air passage A is formed between the guide cylinder 19, the second element 15, and the case 11. An air cleaner in which a passage B is formed and a guide vane 23 for separation is provided in the middle of the inlet pipe 12.