JPS5922244Y2 - Muffler for air control circuit exhaust port - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a muffler for an exhaust port of an air control circuit.

In general, in air control circuits that use air pressure to automatically control various mechanical devices, the pressurized air after operating the work equipment is released into the atmosphere by switching valves, and each exhaust port is I was installing a muffler to muffle the sound.

In the case of an exhaust port muffler used in this type of air control circuit, as shown in FIG. A closure plate 3 having a plurality of exhaust ports is welded and integrally provided, and the exhaust ports 4 are provided on the peripheral wall of the muffler main body 1 at approximately the center.
A sound absorbing material 5 such as glass cloth or metal wool is filled inside the muffler body 1, and the closing plate 3 is inserted between the shoulder 7 of the muffler body 1 and the closing plate 3. A muffler for the exhaust port was formed by tightening bolts 6 and nuts 7.7 to prevent it from coming off.

In such conventional exhaust port mufflers, abnormal operation of the actuator etc. occurs due to an increase in internal pressure during exhaust due to clogging of the sound absorbing material, and the closing plate comes off from the muffler main body 1, or the muffler In order to prevent the muffler from bursting, the closing plate is welded to the muffler body,
The closure plate and the muffler body were fastened together using bolts and nuts to form a sturdy muffler structure.

However, if the sound-absorbing material is replaced at the wrong time, there is still a risk that the closing plate may come off or the muffler itself may explode, causing damage to surrounding objects.

Another drawback is that it is extremely difficult to replace the sound absorbing material due to its sturdy structure.

Furthermore, as shown in FIG. 2, another conventional example of an exhaust port muffler has a sintered metal 12 screwed to one end of an exhaust introduction tube 11 having a flange 10 as a sound absorbing material in the form of a bottomed cylinder. The open end 13a of a bottomed cylindrical muffler case 13 is screwed onto the flange 10 of the exhaust introduction tube 11, and the screwed part is welded. Hole 14.14...
An exhaust port muffler is formed.

Even with such conventional exhaust port mufflers, there are problems such as abnormal operation of the actuator, etc. due to the increase in internal pressure during exhaust caused by clogging of the sintered metal as a sound absorbing material, and detachment of the muffler case from the flange. To prevent the muffler itself from exploding, the flange and muffler case were welded together to make the structure sturdy.

However, even in this case, the muffler case still comes off,
There was a risk that the muffler itself would explode, and the sintered metal was difficult to replace.

Furthermore, the timing of replacement due to clogging of the sintered metal must be determined by looking at the operating condition of the actuator, etc., which has the drawback of being quite difficult and requiring experience.

In view of the shortcomings of conventional exhaust port mufflers as described above, the present invention was developed when the sound absorbing material becomes clogged and the internal pressure of the muffler increases during exhaust, the muffler case moves away from the flange and comes off, causing the muffler to dislodge. It is an object of the present invention to provide a muffler for an exhaust port of an air control circuit, which eliminates the risk of the muffler itself bursting and also allows easy replacement of the sound absorbing material.

Embodiments of the present invention will be described in detail below with reference to the drawings.

In the figure, 20 is a rod-shaped connector that can freely communicate with the exhaust port of the air control circuit.

An exhaust inlet port 21 of the air control circuit is opened at the center of one end of the connecting body 20, and the one end is formed into a tapered shape, and an exhaust port mounting thread groove 22 is provided on the outer periphery.

Further, a plurality of exhaust outlet ports 23 are provided on the circumferential surface of the approximately central portion of the connecting body 20 and communicate with the exhaust gas inlet 21, and a plurality of fitting holes 23 are provided at appropriate intervals on the circumferential surface of the connecting body 20 near one end. A protrusion 24 is provided in a protruding manner.

Further, a flange 25 for closing the end of the muffler case is integrally provided at the other end of the connecting body 20, and the flange 25 includes a case receiving stepped portion 26 whose diameter gradually becomes smaller as it goes inward, and a sound absorbing material. A receiving stepped portion 27 is provided.

A plurality of fitting protrusions 28 are provided on the outer periphery of the case receiving stepped portion 26 at appropriate intervals.

Further, a cylindrical sound absorbing material 29 is inserted into the outer periphery of the sound absorbing material receiving stepped portion 27 via an annular backing 29a so as to surround the connecting body 20.

The sound absorbing material 29 is made of sintered metal or sintered resin having a large number of pores of about 15 μm to 75 μm, glass cloth, wire mesh, or the like.

Next, the muffler case 3 provided on the outer periphery of the connecting body 20
0 is made of plastic and is formed into a cylindrical shape with a bottom, and a through hole 32 for sliding the connecting body 20 is provided in the center of the bottom 31 of the muffler case 30, and the inner surface of the peripheral wall 33 of the muffler case 30 is thicker toward the bottom. A thick portion 34 is provided, and a cutout step portion 34 a for receiving a sound absorbing material is formed at the peripheral edge of the thick portion 34 .

Further, the peripheral wall 33 is provided with a plurality of rows of slit exhaust holes 35, 35 arranged at predetermined intervals.

Furthermore, an annular circumferential groove 37 is bored in the inner surface of the open end 36 of the peripheral wall 33 to fit with the fitting protrusion 28 provided on the case receiving step 26 of the flange 25. An annular circumferential groove 38 is formed on the inner circumferential surface of the hole 32 and fits into a fitting protrusion 24 provided on the circumferential surface of the connecting body 20 .

When attaching the muffler case 30 to the connecting body 20, attach the muffler case 3 from the exhaust inlet 21 side of the connecting body 20.
0, and slide the connecting body 20 into the through hole 32 of the muffler case 30 so that the end of the connecting body 20 extends outside from the through hole 32, so that the open end 36 When reaching the flange 25 of
The annular circumferential groove 37 of the muffler case 30 fits into the fitting protrusion 28 of the muffler case 30, and the fitting protrusion 24 provided on the circumferential surface of the connecting body 20 fits into the annular circumferential groove 38 provided in the through hole 32 of the muffler case 30. Thus, the muffler case 30 is removably attached to the connecting body 20.

At this time, the other end of the sound absorbing material 29, one end of which is inserted into the sound absorbing material receiving stepped portion 27 of the flange 25, is inserted into the annular backing into the sound absorbing material receiving cut stepped portion 34a provided in the thick wall portion 34 of the muffler case 30. 29 a.

FIG. 5 shows a modified embodiment of the exhaust port muffler according to the present invention, in which the same parts as in the previous embodiment are given the same reference numerals and explanations will be omitted, and only the different parts will be explained.

In this embodiment, the exhaust inlet 21' of the connecting body 20 reaches a position near the closing flange 25, and the exhaust outlet 23' communicates with the exhaust inlet 21' over substantially the entire circumferential length of the connecting body 20. There are several.

Further, in conjunction with this, slit exhaust holes 35', 35', . . . of the muffler case 30 are provided over substantially the entire length of the peripheral wall 33'.

Further, one end of the sound absorbing material 29 is inserted into the sound absorbing material receiving stepped portion 27 of the flange 25 via the annular backing 29a, and the other end of the sound absorbing material 29 is inserted into the sound absorbing material receiving step portion 34a' provided at the bottom of the muffler case 30. Abutment is made via an annular backing 29a.

Furthermore, the muffler case 30 is attached to the connecting body 20 by fitting an O-ring 39 to the end of the connecting body 20 extending from the through hole 32 of the muffler case 30 to prevent removal.

As mentioned above, the muffler for the exhaust port of the air control circuit according to the present invention includes a rod-shaped connecting body that can freely communicate with the exhaust port of the air control circuit and has an exhaust inlet opening in the center of one end that communicates with the exhaust port. The connecting body has a flange for closing the end of the muffler case at the other end, and has an exhaust outlet that communicates with the inlet on its peripheral surface, and has a member on the outer periphery of the connecting body that covers the exhaust outlet. A muffler case having a cylindrical bottom shape is provided, the open end of the muffler case is brought into contact with the flange, and a through hole formed at the center of the bottom of the muffler case is slidably fitted into the connecting body, The muffler case has a large number of exhaust holes on its peripheral wall and a sound absorbing material inside the exhaust holes, and when the internal pressure of the muffler case rises above a predetermined pressure, the muffler case is moved away from the flange. As a result, the sound-absorbing material becomes clogged and the internal pressure rises during exhaust, and if the internal pressure exceeds the specified pressure, the muffler case will easily come off the flange, eliminating the risk of the muffler itself bursting. It is something.

Furthermore, when the muffler case is removed from the flange, one end of the connecting body having the exhaust inlet is attached and fixed to the exhaust port of the air control circuit, and the open end of the case is attached to the flange, which is the other end of the connecting body. The parts are in contact with each other, and the through hole of the muffler case is slidably fitted into the connecting body, so when the muffler case is removed from the flange, the muffler case will be removed toward the exhaust inlet of the connecting body. , there is no risk of damaging anything around the muffler.

Furthermore, if the muffler case is detached from the flange, it is easy to see that the sound absorbing material is clogged, and since the muffler case is detachable from the connecting body, it is easy to see if the muffler case is detached from the flange. The sound-absorbing material can be easily replaced, and problems with working equipment due to clogging are eliminated.

Furthermore, since the muffler case can be made of synthetic resin, it also has the advantage that the muffler can be manufactured at low cost.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a muffler for an exhaust port showing a conventional example, Fig. 2 is a longitudinal sectional view of a muffler for an exhaust port showing another conventional example, and Fig. 3 is a muffler for an exhaust port according to the present invention. Fig. 4 is a longitudinal sectional view of the muffler, Fig. 4 is a perspective view showing the disassembled state of the muffler, Fig. 5 is
The figure is a longitudinal sectional view of a modified example of the same muffler. 20...Connection body, 21.21'...Exhaust inlet, 23°23'...Exhaust outlet, 25
...Flange, 30...Muffler case, 32...Through hole, 35.35'...
・Exhaust hole, 36...Open end.

Claims (1)

[Scope of utility model registration request] A rod-shaped connecting body is provided, which can freely communicate with the exhaust port of the air control circuit, and has an exhaust inlet opening in the center of one end that communicates with the exhaust port. A cylindrical muffler case with a bottom is provided on the outer periphery of the connecting body, the muffler case has a cylindrical shape with a bottom, and has a flange and an exhaust outlet that communicates with the inlet is opened on the peripheral surface. The open end of the muffler case is brought into contact with the flange, and a through hole formed at the center of the bottom of the bottomed cylindrical shape of the muffler case is slidably fitted into the connecting body, and the muffler case has a plurality of holes on its peripheral wall. The exhaust hole is provided with a sound absorbing material inside the exhaust hole, and the muffler case is moved in a direction away from the flange when the internal pressure of the muffler case rises above a predetermined pressure. Muffler for air control circuit exhaust port