JPH0313592Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to a silencer that is attached to an air intake port of a reciprocating air compressor or the like.

"Prior Art" Various types of silencers have been known in the past, but the one proposed by the applicant in Utility Model Application No. 60-5049 is effective against both high-frequency sounds and low-frequency sounds. It also has an extremely excellent sound deadening effect.

5 to 7 are diagrams showing the structure of this muffler. In these figures, reference numeral 1 indicates a cylindrical main body made of synthetic resin. A lid 2 is detachably attached to an opening at one end of the main body 1, and the opening at the other end is closed by a bottom wall 3 integrally molded with the main body 1. An expansion chamber 4 is formed in the center of the main body 1, and a cylindrical filter 5 is accommodated therein.

Inside the main body 1, a tail pipe member 6 having an arcuate cross section is provided along the circumferential direction of the main body 1 at a position spaced apart from the inner wall of the main body 1 by a predetermined distance, extending in the longitudinal direction, The gap between the tail tube member 6 and the main body 1 forms the tail tube portion 7. A dead end portion 8 is formed in the tail tube portion 7 at a joint between one end side of the tail tube member 6 and the main body 1.

Four engagement grooves 9, 9, . . . are formed in the outer circumference of the main body 1 on the lid 2 side. On the other hand, a fitting edge 10 is formed on the periphery of the lid 2, and four engaging protrusions 1 are formed on the inner periphery of the fitting edge 10.
1, 11... are formed at approximately equal intervals on the circumference. The lid 2 is rotated by fitting the engaging protrusions 11, 11... into the engaging grooves 9, 9... of the main body 1, and turning the lid 2 into the recesses 11a, 1 of the engaging protrusions 11, 11...
1a... to the protrusions 9a, 9a... of the engagement grooves 9, 9...
It is removably attached by fitting into... A plurality of inlets 12, 12, . . . communicating with the dead end portion 8 are formed in the lid 2 and the bottom wall 3.

An opening 13 is formed in the center of the bottom wall 3, and an annular convex portion 14 that projects radially inward is formed on the inner circumference of the opening 13. A pipe joint 16 having an outlet 15 is attached to the opening 13, and a recess 17 is formed on the outer periphery of one end of the pipe joint 16.
The pipe joint 16 is attached by engaging with the convex portion 14, and the other end of the pipe joint 16 is connected to an air intake port of a reciprocating air compressor (not shown).

As shown in FIG. 7, the filter 5 is formed by folding a long cloth filter medium having a predetermined width into a bellows shape, and is wound around the outer periphery of a cylindrical punched metal 18. And this filter 5
The seal member 19 fixed to the bottom wall 2 and the lid 2
It is fixed by annular protrusions 20, 20 formed on the inner surface of the main body 1, and is accommodated in the expansion chamber 4 of the main body 1.

In the above-mentioned conventional silencer, air from the outside enters the dead end portion 8 through the inflow ports 12, 12, . After passing through the pipe section 7 and the filter 5, it is sucked into the compressor from the pipe joint 16. In this process, a silencing effect is obtained. Also, when unloading, oil-laden air is blown back in the opposite direction to the above.
The sound is muted.

"Problems that the invention attempts to solve" However, in the above conventional silencer,
When the air sucked in from the inlets 12, 12... passes through the arc-shaped tail tube section 7, centrifugal force is generated, and the air pressure on the inner circumferential side of the tail tube section 7 is higher than the air pressure on the outer circumferential side of the same section. tends to be lower. This tendency becomes more pronounced as the air flow rate increases, so the conventional muffler has a problem in that intake resistance increases when high-speed air intake is performed.

"Means for Solving the Problem" This invention consists of a plurality of tail tubes arranged circumferentially inward of the main body, and ends of the tail tubes facing each other and communicating with the expansion chamber. By forming it in such a manner, it is possible to prevent intake resistance from increasing during high-speed intake.

``Example'' Figures 1 to 4 show an example of the silencer of this invention, and parts having the same basic structure as those shown in Figures 5 to 7 are the same. The description thereof will be omitted.

In these figures, the tail tube member 6 has a cylindrical shape, and the tail tube portion 7 formed between the tail tube member 6 and the main body 1 has an inner peripheral surface of the main body 1 and the tail tube member 6.
The partition 2 is perpendicular to the outer circumferential surface and spans the entire length in the axial direction.
8 is formed. The tail tube portion 7 is divided into two by this partition 28, and dead end portions 8, 8 are formed here. The lid 2 and the bottom wall 3 have
The same number of inlets 12, 12, . Further, in the tail tube member 6, a rectangular opening 26 is formed over the entire length in the axial direction, at a position facing the partition 28, for communicating the tail tube portions 7, 7 and the expansion chamber 4.

Next, the operation of the above silencer will be explained. When a reciprocating air compressor (not shown) connected to the pipe joint 16 of the muffler is operated, external air is sucked in from the inlets 12, 12, . . . . These airs flow in the same amount into the dead end parts 8, 8 formed by the partition 28, and are divided into two parts, which circulate in the semi-cylindrical tail pipe parts 7, 7 at approximately the same speed in mutually opposite directions. , collides with the partition 28 at a position 180° apart. Since the opening 26 is formed at this position, the air flows into the expansion chamber 4 through the opening 26, passes through the bellows-shaped filter 5, and flows out through the outlet 15.

In a silencer with such a configuration, the inlet 1
The air taken in from 2, 12... is divided into two parts, circulated in opposite directions inside the tail pipe parts 7, 7, and then collided with each other, so that the air flows inside the tail pipe parts 7, 7 at high speed. It is possible to offset the centrifugal force generated when flowing, and reduce the intake resistance caused by this centrifugal force.

In addition, in this muffler, two tail pipe parts 7 are formed, and inlets 12, 12, . As a result, the air flow path is substantially widened, and intake resistance and exhaust resistance are reduced.

Furthermore, since this muffler has reduced exhaust resistance as described above, it is possible to reduce fluid noise caused by exhaust air when the air compressor is unloaded.

As shown in FIG. 8, on the inner circumferential surface of the main body 1, at a position facing the opening 26 of the tail tube member 6,
When the triangular prism-shaped guide section is formed, the air that has passed through the tail tube sections 7, 7 can be introduced into the expansion chamber 4 more smoothly, and the ventilation resistance can be further reduced compared to the above example. and fluid noise.

It is also possible to further increase the number of tail tube sections and arrange three or more tail tube sections, or to have a configuration in which the tail tube sections are each independent, as shown in FIG.

Furthermore, if the numbers of inflow ports on the left and right sides are not the same, the positions of the inflow ports can be biased toward the side with fewer inflow ports.

Furthermore, if the inlet is formed at a distance of 180° from the opening of the tail tube, there may be no partition between the two tail tubes.

``Effects of the invention'' In the silencer of this invention, the air taken in from the inlet is divided into two parts, circulated in the opposite directions in multiple tail tubes, and then re-merged before being introduced into the expansion chamber, so it can be used at high speed. Even if centrifugal force is generated by the air flow within the tail pipe portion during intake, this can be offset, and an increase in intake resistance due to this centrifugal force can be prevented. Furthermore, since the air flow path becomes substantially wider, intake resistance and exhaust resistance can be reduced, and in particular, fluid noise during exhaust can be reduced.

[Brief explanation of the drawing]

1 to 4 are diagrams showing an embodiment of the muffler of this invention. Fig. 1 is a side sectional view, Fig. 2 is a sectional view taken along line A-A of the main body part in Fig. 1, Fig. 3 is a side view of the opening side of the main body, and Fig. 4 is a view of the lid from inside. It is a front view. Moreover, FIGS. 5 to 7 are diagrams showing conventional silencers, and FIG. 5 is a side sectional view, and FIG. 6 is a side sectional view.
The figure is a front view of the main body portion, and FIG. 7 is a partially cutaway front view of the filter portion. Also, Figures 8 and 9
The figure is an explanatory view showing another embodiment of this muffler. 1...Body, 2...Lid, 3...Bottom wall, 4...
Expansion chamber, 5...filter, 7...tail pipe section, 12...
...Inflow port, 15...Outflow port.

Claims (1)

[Claims for Utility Model Registration] A cylindrical main body in which an expansion chamber and a tail pipe portion communicating with the expansion chamber are formed, and one end of the main body is closed and an outlet to the outside of the main body is formed. a bottom wall, a lid removably attached to the other end of the main body opposite to the bottom wall, an inlet communicating with the tail tube, and a filter housed in the expansion chamber. The tail pipe portion is arranged circumferentially inward of the main body and located in the expansion chamber at a position that offsets the centrifugal force generated when the air from the inlet flows in opposite directions. A silencer characterized by being formed so as to communicate with the.