JPS6010667Y2 - Disposable two-stage air cleaner - Google Patents

Description

[Detailed description of the invention] The present invention mainly relates to an air cleaner for small engines, and more specifically, it is a two-stage type air cleaner having a centrifugal precleaner as the first stage and a cylindrical dry filter element as the second stage. Regarding air cleaners.

Typically in this type of centrifugal air cleaner, the second stage filter element is periodically cleaned or replaced when it becomes clogged with dust.

The first stage centrifugal precleaner has the function of removing relatively heavy coarse particles in the dust-containing air before they reach the filter element, thereby increasing the life of the element until it becomes clogged.

The above are the general functions of this type of centrifugal air cleaner, but as explained below, the present invention improves the efficiency of the precleaner function by using the shape of the air inlet provided in the end cover. In addition to extending the service life until clogging more than ever before, it is a non-disassembly type that adheres and seals the element to other end caps, reducing the number of parts as much as possible.In addition to thinning the plate thickness of the casing and both end caps, the shape of the parts The purpose of the present invention is to provide an inexpensive improved air cleaner that can be replaced as a whole assembly when the element becomes clogged and reaches the end of its life by reducing costs by simplifying the process.

A more detailed explanation will be given below with reference to the drawings.

FIG. 1 shows a side cutaway view of a horizontal air cleaner as an embodiment of the present invention.

An end cap 11 disposed on the first open end of the cylindrical casing 10
The air outlet tube 13 is fitted and fixed at a certain depth to the center, and an annular R11a is provided with the inner circumference at the far end, and the large end 14a of the cone type filter element 14 is fitted into this. It shall be a one-piece structure that is bonded and held together with adhesive.

The end cover 12 disposed at the second open end of the casing 10 is designed to fit into the space between the outer periphery of the element and the inner wall of the casing, that is, the annular intake passage 19, as shown in FIG. 2, when the element is housed in the casing. A plurality of air inlets 12b are arranged in an annular manner in the flat part, and the opening shape has a semi-conical recessed type and a semi-conical raised type across a square hole, as shown in Fig. 3, to reduce suction resistance. It also serves as a directly molded centrifugal precleaner to generate a small amount of swirling flow with high separation efficiency.

In addition, one dust outlet 10a is provided on the side wall of the casing 10 near the first open end, which is the air outlet side, and a dust receiving tube 20 having a hole of the same shape as this is fixed on top of the other, and its open bottom surface An elastic body discharge valve 21 is fitted into the collar.

The cone type filter element 14 is composed of a pleated filter 15, a perforated plate 16 for protecting its inner periphery, and an end plate 17 for holding the small end 14b, and the large end 14a is attached to the end cap 11 with adhesive. It is adhered and held by.

The end plate 17 for holding the small end is made of synthetic resin and is molded with the small end embedded during molding.

A circular recess 17a provided in the center of the end plate is formed in the end cover 1 after assembly.
It fits into the circular convex portion 12a provided at the center of the element 2 with a slight gap in the axial direction, thereby suppressing swing vibration caused by cantilever holding of the element to a minimum.

In addition, the outer periphery of the pleated filter 15 near the large end 15a is wrapped and glued to an appropriate length with a cover plate 18 such as paper, so that the dust that collects near the dust outlet 10a is easily attached to the filter by suction from the air outlet. prevent it from becoming

The peripheral edges of the end covers 11 and 12 and the casing 1 explained above
A two-stage air cleaner is constructed in which the filter element is enclosed in a cantilevered manner by the end cover 11 by lock seaming the peripheries of both open ends of the filter element.

In the air cleaner attached to the engine, when the engine starts, air is sucked from the outlet tube 13 via the air cleaner.

At this time, the air flowing in from the air inlet 12b passes through an annular air passage 19 between the outer periphery of the element and the inner wall of the casing, becomes a swirling flow, and heads toward the air outlet side.

Relatively heavy coarse particles in the dust contained in the air travel along the inner wall of the casing due to centrifugal force, and are finally periodically discharged outward by the elastic discharge valve 21, which is installed in advance in a downward direction.

On the other hand, fine dust particles left in the air are trapped when the air passes through the element, making it clean and reaching the engine.

As explained above, there is no particular difference in function from a known centrifugal air cleaner, but by improving the efficiency of the precleaner, the lifespan of the element is extended from clogging, and by enclosing the element and making it impossible to remove it, the seal gasket In addition to omitting several parts for attaching the element and end cap, the thickness of the casing and end cap can also be made thinner, making it possible to significantly reduce costs. This is extremely effective in that it not only eliminates complaints caused by poor maintenance that previously occurred, but also saves the time and effort required for maintenance.

The above was explained as one embodiment based on the present invention, but
It is not limited to this description.

[Brief explanation of the drawing]

The drawing shows an example in which the present invention is applied to a horizontal air cleaner.
The figure is a side cutaway view, Figure 2 is a view from the A arrow, and Figure 3 is a B-
B shows a sectional view. 10...Casing, 10a...Dust outlet, 11...End cover, lla...
Groove, 12... end cover, 12a... convex part,
12b...Air inlet, 13...Air outlet tube, 14...Element, 14a...
...Large end, 14b...Small end, 15.
... Filter, 16 ... Perforated plate, 17
...End plate, 17a...Concavity, 18...
... Cover plate, 19 ... Air passage, 20 ...
...Dust receiving tube, 21...Dust discharge valve.

Claims (1)

[Claim for Utility Model Registration] A cylindrical casing 10 with both ends open and a dust discharge valve 21 fitted to the side wall, and an air outlet tube 13 in the center, with the inner periphery at the rear end of the tube. An end cover 11 is provided with an annular groove 11a, one end of which is closed with an end plate 17, and the other end of the cylindrical filter element 14 is fitted into the annular groove and held by adhesive, and a plurality of air inlets 12b are directly molded onto the flat part. In this centrifugal two-stage air cleaner, the end caps 11 and 12 are arranged in an annular manner and are also used as pre-cleaners. element 14
A disposable two-stage air cleaner featuring a sealed air cleaner.