SU1747736A2 - Air purifier for internal combustion engine - Google Patents

Abstract

Usage: engine, in particular air cleaners, equipped with means of sound attenuation. Objective: to increase the efficiency of sound attenuation at the engine inlet. SUMMARY OF THE INVENTION: In the air cleaner, the ends of the deflector 8 are perforated, the total hole area of each perforation area being 0.5 ... 0.9 cross-sectional area of the channel section, at the location of the corresponding section: The length of the perforation areas is no more than four given diameters of the mentioned sections. 1 hp f-ly, 4 ill.

Description

6-6 5V 5 to 8

(L

I

eight

FIG. four

   with about

YU

FIELD OF THE INVENTION The invention relates to engine-making, in particular, to air purifier structures equipped with sound attenuating elements.

A known air cleaner for an internal combustion engine, comprising a cylindrical body with a bottom, provided with inlet and exhaust ports, respectively, the latter being offset relative to the axis of the cylindrical body, the body cover and the filter element. At the same time, the air cleaner is equipped with a defector located between the housing and the filtering element on the side of the inlet window and forming branching channels with the housing walls, with the dynamic sections of the channels located in a plane perpendicular to the plane passing through the center of the outlet window and the axis of the cylindrical body.

The disadvantage of this air cleaner is that when the engine is running, intense resonant oscillations of the air volume contained in the branching channels may occur, which reduces the intensity of the noise jamming and manifests itself, in particular, in the form of subjectively unpleasant bells.

The purpose of the invention is to increase the efficiency of sound attenuation.

The goal is achieved by the fact that in an air cleaner for an internal combustion engine, comprising a cylindrical housing with a bottom, provided with inlet and exhaust ports, respectively, the latter being displaced relative to the axis of the cylindrical housing, the housing cover and the filter element, as well as the baffle located between the housing, and the filter element on the side of the inlet window, forming branching channels with the casing walls, the dynamic sections of the channels being located in a plane, perpe a flat plane passing through the center of the outlet port and the axis of the cylindrical body, and perforated sections are made at the ends of the deflector. The most preferred case is when the total hole area of each of the perforation sections is 0.5-0.9 of the channel cross-sectional area at the location of the corresponding section, and the lengths of the perforation sections are no more than four given diameters of the said sections.

With this design, the resonances in the branching channels are effectively suppressed by successively connected resistances — perforation holes (diffusers) installed in the joints

oscillatory velocities (pressure nodes).

FIG. 1 shows the air cleaner

with the cover off, top view; in fig. 2, section A-A in FIG. one; in fig. 3 - epures

distribution of vibrational velocities b1

a pipe that is open on both sides on the lower resonance forms of its own (1, 2 and 3 forms of oscillations); in fig. 4 is a section BB in FIG. one.

The air cleaner includes a housing 1,

made in the form of a circular cylinder and the bottom 2. provided with an inlet 3 and outlet 4 windows, respectively, a housing cover 5 and a filtering element 6. as well as an air intake manifold 7. Inside the housing 1, from the inlet port 3, a deflector 8 is installed between the housing 1 and the filtering element 6 the possibility of formation between the deflector 8 and the housing 1 of the branching channels 9 and 10, while

The dynamic sections 11 and 12 of the respective channels 9 and 10 are located in the plane X-X, perpendicular to the plane Y-Y, passing through the center 0 of the inlet port 3 and the axis B-B of the cylindrical body 1.

The ends of the deflector 8 are perforated, the total area of the holes 13 of each of the perforations 14 and 15 is 0.5-0 9 and the cross section of the channel, respectively 9 and 10, at the location of the corresponding section 14 and 15 respectively. The lengths of the perforation sections 14 and 15 were There are no more than four given diameters of the above sections.

With this design, the resonances arising in the channels are effectively suppressed by means of successively connected diffusers (perforation holes) set by D

oscillations of oscillatory velocities Serially connected scatterers (sections 14 and 15) are most effective in zones of maximum oscillatory velocities. When re-energies of the branching channels 9 and 10, the antinodes of all the resonant waveforms of the channels are realized at their open ends. Thus, making the holes 13 of the perforations at the ends 14 and 15 of the channels 9 and 10 increases the suppression efficiency of the resonant channels 9 and 10 due to the selection of the most effective zone for performing the perforations 13

To compensate for the near hydrodynamic field at the end of the perforated

plots 14 and 15 associated with the buildup

gas in the perforation 13, it is necessary to take into account the value of the dynamic increment, measured from the junction point of the smooth section of the deflector 8 with perforated sections 14 and 15,

dA

Jl

4), +0.5 where /, p-Jup63 op) P,

where 5P is the thickness of the walls of the deflector, mm;

don - perforation hole diameter, mm;

n is the number of perforation holes in one row;

fo is the area of the bore of one hole, mm;

Fk is the cross-sectional area of the channel, mm,

t is the longitudinal pitch of perforation holes (their rows), mm;

1ef gk I-D2, where 1Gk is the length of a smooth channel;

And - a dynamic increment of the punched sites.

In practice, the total area of perforation holes should be R resp. "Q.5-0.9) FK.

In that case, KOI and the total perforation area exceeds 0.9 of the cross-sectional area of the channel 9 and 10, only an insignificant perforation area 14 and 15 is active. This is reasonable from economic considerations, as the metal consumption of the structures increases and the manufacturing labor intensity increases. At the same time, the further elongation of the perforated area does not affect practically the effectiveness of noise blocking. In the case when the perforation area is not less than 0.5 of the cross-sectional area of the channels 9 and 10, a significant part of the flow and sound will go to the nozzle (channel) along its axis, through the open one. At the same time, the potential damping capacity of the perforated sections 14 and 15 as sound diffusers will not be fully used. 5 Given the ratios of the total perforation area 13 and the cross-sectional area of channels 9 and 10, almost all the gas and sound will enter the channels through the perforations,

0 when the perforation areas 14 and 15 will be in close proximity to the smooth section of the channels 10 and 9, and the length of the perforated sections 14 and 15 should not exceed 4 d, where d 5 is the reduced diameter of the corresponding channel (the reduced diameter is RK / 4P, where P - channel perimeter). In this case, perforated sections 14 and 15 appear to have oscillatory velocity maxima, which

0 leads to intense dissipation of the energy of the resonant forms and they are significantly suppressed.

Claims (2)

Thus, the optimal location of the perforated areas on the de5flector 8 makes it possible to increase the efficiency of noise suppression, to obtain a technological structure that does not require additional metal costs. Invention Formula 51. Air cleaner for engine internal combustion, by author. EV, N 1375847, characterized in that, in order to increase the efficiency of sound attenuation, at the ends of the deflector are made 0 perforated areas. 2. The air cleaner according to claim 1, characterized in that the hole area of each of the perforation portions is 0.5-0.9 of the cross section of the channel at the location of the corresponding portion, and the lengths of the portions of the perforated portions are no more than four diameters of sections. BUT . X ff f4 15 ft