JPH0444811Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a silencer for an internal combustion engine.

[Prior art]

A problem with mufflers for internal combustion engines is that condensed water accumulates inside the muffler, corroding the muffler.

As a conventional method for actively draining this condensed water, as shown in FIG. A drain pipe 5 is provided which is connected to the drain pipe 5 and has its lower end opened at the bottom of the chamber 3, and the pressure generated at the open end of the drain pipe 5 into the chamber 3 and the pressure generated at the open end into the outlet pipe are separated. There is a system in which the condensed water accumulated in the chamber 3 is pumped up from the drain pipe 5 and drained outside the vessel from the outlet pipe 4 by the pressure difference between the two.

[Problem that this invention attempts to solve]

As mentioned above, in the case where water is pumped up from the drain pipe 5 using a differential pressure, since the drain pipe 5 is long, there is a problem that the condensed water is not pumped sufficiently when the differential pressure is small and the engine speed is low. be. Furthermore, in modern mufflers, since the exhaust resistance is small, the above-mentioned differential pressure does not become very high in the above-mentioned system, and the drainage performance thereof deteriorates.

Therefore, the present invention proposes a silencer that uses the exhaust flow inside the silencer to splash condensed water to the exhaust introduction part of the outlet pipe, without using differential pressure, and improves its drainage performance. This is the purpose.

[Means to solve the problem]

In order to solve the above-mentioned problem, the present invention provides a means for actively guiding the condensed water accumulated at the bottom of the chamber into the exhaust inlet at the bottom of the chamber where the exhaust inlet of the outlet pipe opens. This is a silencer featuring the following.

[Effect]

The scattering means is actuated by the exhaust flow, and the condensed water collected at the bottom of the scattering means is scattered and discharged from the outlet pipe to the outside of the vessel by the exhaust flow.

〔Example〕

Next, a first embodiment of the present invention shown in FIGS. 1 and 2 will be described.

Reference numeral 6 denotes an outer shell of the silencer, the interior of which is divided by a partition wall 7 into a plurality of chambers 8a, 8b, and 8c. A water passage hole 9 is formed at the lower end of the picture wall 7. 1
0 is an inlet pipe for introducing exhaust gas, and its downstream end opens into the first chamber 8a. 11 is an outlet pipe for exhaust, and its exhaust inlet 11a
opens into the third chamber 8c, and the downstream end opens outside the vessel. Reference numerals 12 and 13 are inner pipes that communicate the respective chambers. Reference numeral 14 denotes a guide plate that connects the third outlet pipe 11 to which the exhaust gas inlet 11a opens.
In the chamber 8c, it is located below the front of the exhaust gas introduction port 11a and is fixed to the inner surface of the bottom portion 6a. The peripheral wall 14a of the guide plate 14 is formed into a concave curved surface that is a part of a spherical surface. Further, a water guide hole 15 is formed at the bottom of the guide plate 14. 16 is an exhaust blowing pipe, the base end of which is connected to the inlet pipe 10.
The guide plate 14 is connected to the guide plate 14 in a branched manner, and its tip is opened near the bottom surface in the center of the guide plate 14 .

In this embodiment, when exhaust gas flows into the inlet pipe 10, part of the exhaust flow is diverted from the exhaust blowing pipe 16, and the diverted exhaust gas is
The condensed water W accumulated in the guide plate 14 is sprayed from the tip of the exhaust spray pipe 16. Therefore, the condensed water accumulated in the guide plate 14 is guided by the peripheral wall 14a of the guide plate 14 and splashed up, turns into water droplets, scatters at the exhaust inlet 11a of the outlet pipe 11, and is discharged by the exhaust flow. Lettu pipe 1
It is discharged from 1.

FIG. 3 shows a second embodiment of the present invention, in which the guide plate 14 is formed by bending a part of the bottom wall 6a of the outer shell 6 downward to form a guide plate 14b. FIG. 4 shows a third embodiment of the present invention, in which a curved guide plate 14 is provided at the lower end of the exhaust blowing pipe 16 and projects only toward the outlet pipe 11.
At the same time, an exhaust blowing hole 1 is fixed at the lower end of the exhaust blowing pipe 16 and located on the guide plate 14c side.
6a is formed.

Next, an embodiment according to claim 3 shown in FIGS. 5 to 7 will be described.

In this embodiment, reference numeral 17 denotes a rotating body for splashing water, which is located below the front of the exhaust inlet 11a of the outlet pipe 11 and is connected to the bottom wall 6a.
A rotary disk 19 that rotates in a plane around a support shaft 18 is provided on the inner surface of the rotary disk 19, and blades 20 are attached to the upper surface of the periphery of the rotary disk 19. A water splash guide 21 is provided on a part of the outer periphery of the rotating body 17. The water splash guide 21 is formed so that its peripheral wall expands upward, and a water guide hole 22 is formed in the lower part of the peripheral wall. The inlet pipe 13 is arranged so that the exhaust flow flowing out from the inlet pipe 13 hits the blades 20 of the rotary body 17 and rotates the rotary body 17.

In this embodiment, the rotating body 17 is rotated by the exhaust flow discharged from the inlet pipe 13,
The condensed water on the rotary body 17 is rotated and scattered upward in the form of water droplets due to its centrifugal force and the water splash guide 21. The scattered water droplets are then discharged from the outlet pipe 11 to the outside of the vessel by the exhaust flow.

Next, an embodiment according to claim 4 shown in FIGS. 8 and 9 will be described.

In this embodiment, 23 is a resonant member, which connects the exhaust gas inlet 11 in the outlet pipe 11.
It is located below the front part a and is fixed to the inner surface of the bottom wall 6a. As shown in FIG. 9, the resonance member 23 is made by integrally bending a mounting board 23a, a rising plate 23b from the mounting board 23a, and a resonance plate 23c horizontally projecting from the rising board 23b using a thin plate. It is formed. The inner pipe 13 is located at the rear of the resonance member 23, and the resonance plate 23c of the resonance member 23 is connected to the inner pipe 1.
The resonator plate 23c is oriented in the direction along the exhaust flow from the resonator plate 23c, and is installed so that the exhaust flow flows along the upper part of the resonance plate 23c.

In this embodiment, the resonance plate 23c of the resonance member 23 is caused by the pulsation of the exhaust flow rate flowing out from the inner pipe 13 due to the pulsation of the engine rotation.
vibrates. Due to this vibration, the resonance plate 23c
The condensed water is splashed up in the form of water droplets and discharged outside the vessel from the outlet pipe 11 by the exhaust flow.

Next, an embodiment according to claim 5 shown in FIG. 10 will be described.

In this embodiment, 24 is a water splashing plate, which connects the exhaust inlet 11 in the outlet pipe 11.
It is located below the front of the bottom wall 6a and is fixed to the inner surface of the bottom wall 6a. An exhaust passage 25 directed toward the water splash plate 24 is formed at the lower end of the partition wall 7 between the third chamber 8c in which the water splash plate 24 is installed and the second chamber 8b adjacent thereto. In addition, the water splash plate 24
is formed in an arc shape with its center on the exhaust passage 25 side.

In this embodiment, due to the exhaust flow from the exhaust passage 25, condensed water accumulated at the bottom of the water splash plate 2
4, the water becomes droplets and scatters upward, and is discharged from the inlet pipe 10 to the outside of the vessel by the exhaust flow.

Note that the inner pipe 13 may be installed near the bottom and also serve as the exhaust passage 25.

Next, an embodiment according to claim 6 shown in FIG. 11 will be described.

In this embodiment, 26 is the inlet pipe 1
An exhaust inlet pipe branched from 0, the tip of which is connected to the exhaust inlet 11 in the outlet pipe 11.
It opens upward from below in the bottom wall 6a located at the lower front of part a. A condensed water reservoir 27 is formed in the opening by making the bottom wall 6a concave.
As shown in FIG. 12, the opening has a flow dividing member 28 in the center, and has branched small-diameter jet passages 26a,
26b.

In this embodiment, the third
The condensed water accumulated on the bottom wall 6a is scattered upward by the exhaust gas ejected into the chamber 8c, and is discharged out of the vessel from the outlet pipe 11 by the exhaust flow.

[Effect of idea]

As described above, the present invention uses the exhaust flow as the operating source to scatter the condensed water accumulated at the bottom and discharge it outside the vessel from the outlet pipe using the exhaust flow.
Even when the engine speed is low or the differential pressure inside the muffler chamber is small, condensed water can be sufficiently discharged outside the muffler, preventing corrosion of the muffler due to condensed water, making it a highly durable muffler. can suggest.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing the first embodiment of the present invention;
FIG. 2 is an enlarged side sectional view showing the guide plate.
3 and 4 are side sectional views showing two other examples of the guide plate. FIG. 5 is a side sectional view showing the fourth embodiment of the present invention, and FIG. 6 is a plan view showing its rotating body.
FIG. 7 is a side sectional view of the rotating body. FIG. 8 is a side sectional view showing a fifth embodiment of the present invention, and FIG. 9 is a perspective view of its resonant member. FIG. 10 is a side sectional view showing a sixth embodiment of the present invention. FIG. 11 is a side sectional view showing a seventh embodiment of the present invention, and FIG. 12 is an enlarged side sectional view of the main part thereof. FIG. 13 is a side sectional view of the conventional structure. 10... Inlet pipe, 11... Outlet pipe, 11a... Exhaust inlet, 14... Guide plate, 16... Exhaust blowing pipe, 17... Rotating body,
23...Resonance member, 24...Water splash plate, 25
...Communication path, 26...Exhaust introduction pipe.

Claims (1)

[Claims for Utility Model Registration] 1. Exhaust inlet 11a of outlet pipe 11
A guide plate is provided at the bottom of the chamber where the chamber opens to guide the condensed water accumulated at the bottom to the exhaust inlet port 11a, and a small-diameter exhaust blower branched from the inlet pipe 10 and extended toward the guide plate. A silencer characterized in that a pipe 16 is provided. 2. A silencer according to claim 1 of the utility model registration, wherein the guide plate has a concave curved surface. 3 Exhaust inlet 11a of outlet pipe 11
A rotating body 17 is provided at the bottom of the chamber where the chamber opens, and guides the condensed water collected at the bottom to the exhaust inlet 11a.
A muffler is provided with an exhaust passage 13 for applying an exhaust flow to the rotating body. 4 Exhaust inlet 11a of outlet pipe 11
A resonant member 2 is provided at the bottom of the chamber where the chamber opens, and guides the condensed water collected at the bottom to the exhaust inlet 11a.
3 and an exhaust passage 13 for applying an exhaust flow to the resonant member so as to vibrate it. 5 Exhaust inlet 11a of outlet pipe 11
A water splash plate 24 is provided at the bottom of the chamber where the outlet pipe opens, and which guides the condensed water accumulated at the bottom to the exhaust inlet 11a. A communication path 25 is provided in the painting wall, and the communication path 2
The muffler is configured such that the exhaust flow from 5 hits the water splashing plate 24. 6 Exhaust inlet 11a of outlet pipe 11
An exhaust inlet pipe 26 is branched to the inlet pipe 10 at the bottom of the chamber where the chamber opens, in order to guide the condensed water accumulated at the bottom to the exhaust inlet 11a.
The muffler has its tip connected to the bottom wall of a chamber in which the exhaust gas inlet of the outlet pipe 11 opens, with its open end facing upward.