FR2766870A1 - Straight through silencer for internal combustion engine exhaust - Google Patents

Abstract

The silencer is constituted by a pipe (A) having two openings, with holes on its periphery, in which partitions (B), with a central drilled hole, are placed. Compression springs (F) between the partitions serve as shock absorbers. A partition (C) at one end of the pipe has a central drilling of the same diameter as the partitions and small peripheral holes according to the gas pressure. A pipe (E) with small peripheral holes exhausts gas contained in the casing (D) and the partition and cancels the residual sounds from pipe (A).

Description

 The present invention relates to a direct passage device for canceling the exhaust sound shock for internal combustion engines, internal combustion engines, firearms, propeller turbopropellers, compressed air purges.

The silent moderator currently in service has the drawback of gas braking and soot fouling which obstructs the drainage and water condensation holes, hence the tinkering on mopeds and motorcycles and unpleasant noises. of all portable thermal machines or not due to a bad design.

The device according to the invention overcomes these drawbacks, it indeed comprises according to a first characteristic a housing having two orifices in line through which enter and exit the gases or projectiles and gases.

According to particular embodiments, the housing comprises several types of internal constructions designated by 32 sectional figures. Details that illustrate the mounting differences depending on the power of the deflagrations canceled.

The basic device is thus composed:
Figure 1) - A tube A pierced with cylindrical holes of sufficient diameters or oblong holes fig 2, in which are placed in series partitions B held by springs F, H, or spacers I on rods G, following figures 3, 4 , 5, 6. a partition C pierced in its center with the same internal diameter as the partitions B, and on its periphery a series of cylindrical holes according to the pressure of the gases to be evacuated
- A tube E pierced with small cylindrical holes allows the evacuation of the gases contained in the box D and to cancel the residual waves of A.

The device works as follows:
Deflagrations and gases entering the housing D according to the arrow in the direction of direction. The shock waves having a very rapid annular expansion speed (300m / s) are reflected on the walls of the partitions B and on the tube A, which allows the formation of sound beams which pass through the perforations of the tube A, and collide in the housing D and cancel each other out in the same way as two water jets placed face to face.

 Figure 6 shows a partition B for rifle juxtaposed or superimposed beyond the same way it is possible to add an additional hole for a third barrel, which will have the effect of an extension of the tube A and a tightening of the partitions B. In the same way it proceed on partition C.

Figures 1 to 29 in sections show the different possible arrangements around the tube A identified by letters of designation according to the following list:
Tube A - Metal or composite tube which may have cylindrical, square, rectangular, etc. shapes, and drilled on its periphery with holes of various shapes but identical on the tube.

 Partition B - Breakthrough at the nominal diameter of the exhaust gas passage or at the upper diameter of the projectile to be passed, they must have a reduced space between them, shaped according to the profile of A.

 Partition C - Placed between A and E pierced in its center like B and small cylindrical holes for gas evacuation on its periphery.

 Tube E Metal or composite tube pierced with small holes on its periphery.

 Envelope D Metal or composite tube that can take any shape.

 Springs F - Compression of large diameter between the partitions B, D AND C, are used to maintain the spacing of the partitions B and shock absorbers.

 Guide geometry G Metal is used to prevent the partitions B with double holes from pivoting, they are held by the housing D at each end.

Springs H - Compression of small diameter on rods G and between partition B, same function as F. i
Spacers 1 - Maintains space between partition B for mounting with G.

 Molded packing J - In material absorbing shock waves in contact with the wall D.

 Trim L - Metallic knit, glass fabrics, kerlane etc .... serves as a shock wave absorber.

 Mesh M - Metallic, composite, used to maintain the L trim.

 Tube N - Metal or composite, envelops tube A. pierced on its periphery with holes smaller than tube A, serves to cancel shock waves more quickly and prevents a passage of flame towards D.

 Tube O - Metal or composite, envelope A and N, pierced on its periphery with holes smaller than tube N, gives a higher and faster cancellation of shock waves.

 P-rings - Metal or composite between the tube A and N are used to channel the shock waves and avoid spreading the waves throughout the housing D, can be mounted on all the assemblies A and N, and A N O.

 FIG. 30 shows a different assembly for very strong deflagrations, the tubes A and Al can receive in the housing D all the assemblies of the preceding figures.

 Figure 31 shows that the system with all the assemblies of the previous figures can be refrigerated with water for nautical systems or washing fumes, provided that the appropriate materials are used.

 Figure 32 shows the water-cooled system through an envelope outside the housing D.

 The device has the advantage of being able to adopt various fixing methods, to be mounted directly at the outlet of an exhaust manifold or weapon, does not in any way interfere with gas catalysis systems, it can receive a limiting diaphragm at the inlet or outlet outlet from box D.

 The device can be extended by direct mounting in series or with elbows to save space. This can have very small to very large dimensions depending on the volumes of gas and shock waves to be treated.

 The best shock wave cancellation efficiency is an assembly with cylindrical tubes inside the housing D. The housing D can take various forms without hampering the performance of the device.

The partition C can be mounted in a ring around the tube A during large assemblies and must be maintained by spacers, guide rods with spacers, or springs or circlips on guide rods not shown
The linings J, L associated with M; serve to maintain the partitions C mounted in rings on A, add perforated rings with blocking on the tube A
Partition C. It can be eliminated in certain assemblies and replaced by small holes on the outlet flange D not shown
The tube E pierced with small holes on its periphery serves to evacuate the gases from the case
D coming from partition C and cancels the residual waves. I1 can be eliminated in certain assemblies and replaced by small holes on the outlet flange of the case D not shown
Case D can receive a rise and a target sight outside for use with a weapon not shown
The tube A and the partitions B are larger than the tube Al and the partitions B 1 for the device with very high explosions
Large diameter partitions B can be fixed by mechanical technical means not shown
Not having at my disposal the financial means to practice tests on a reactor or a turbo reactor, to study the thrust losses of gases in direct assembly on the outlet of the nozzle, or if it is necessary to practice vents of air to obtain an optimal force inside the device, in order to have the strongest power of the gases pressing on the surrounding air at the outlet of the device. I think the system is able to work.

Claims (20)

 1) Device for canceling shock waves characterized in that it comprises a housing (D) having two orifices in which there is a tube (A) pierced with holes in which there are partitions (B) with springs (F ), and a partition (C) which is guided inside the case and a tube (E) pierced with small holes  2) Device according to claim 1 characterized in that the tube (A) constitutes by these sufficient perforations on its periphery the main element of the assembly with the partitions (B)  3) Device according to claim 1 or claim 2 characterized in that rods (G) with springs (H) or spacers (I) prevent the partitions (B) and (C) from rotating for the double holes or triple cannons  4) Device according to claim 1 or claim 3 characterized in that the partition (C) pierced in its center at nominal diameter and on its periphery with small degassing holes between the tube (A) and the housing (D) and the tube (E)  5) Device according to claim 1 characterized in that the molded lining (J) of shock wave absorbent material is in internal contact with the housing (D)  6) Device according to claim 1 or claim 5 in that the lining (L) serves as shock absorber and the mesh (M) to maintain the lining in the housing (D)  7) Device according to claim 1 or claim 2 in that the tube (N) of diameter larger than (A) is pierced with holes smaller than (A) on its periphery is used to cancel shock waves more quickly and flame arrester towards the wall of the housing (D)  8) Device according to claim 7 in that the tube (O) of diameter larger than (N) is pierced with holes smaller than (N) on its periphery gives a higher efficiency of cancellation of shock waves  9) Device according to any one of claims 7 and 8 characterized in that the rings (P) placed between the tube (A) and (N) are used to channel the waves, the rings () can also be mounted between the tubes (N) and (O)  10) Device according to any one of the preceding claims, characterized in that the partitions () can be mounted in a ring around the tube (A) during large assemblies and must be maintained by spacers, guide rods with spacers, or springs, or circlips on guide rods not shown  11) Device according to any one of the preceding claims 5 and 6 characterized in that the linings (J) (L) associated with (M); serve to maintain the partitions (C) mounted in rings on (A), add perforated rings with locking on the tube (A)  12) Device according to any one of the preceding claims, characterized in that the tube (E) pierced with small holes on its periphery serves to evacuate the gases from the housing (D) coming from the partition (C) and cancels the residual waves . It can be removed in certain assemblies and replaced by small holes on the outlet flange of the case ( D) not shown  13) Device according to any one of the preceding claims, characterized in that the partition (C). It can be eliminated in certain assemblies and replaced by small holes on the outlet flange of the housing (D) not shown.  14) Device according to any one of the preceding claims, characterized in that the box (D) with these two flanges entering and leaving the device is used for maintaining the assembly and for canceling the shock waves.  15) Device according to any one of the preceding claims, characterized in that the box (D) can receive at the inlet or outlet of the device a diaphragm to limit the passage of gases in the catalysis system, not shown.  16) Device according to any one of the preceding claims, characterized in that the box (D) can receive outside a rise and a sighting target for use with a weapon not shown  17) Device according to any one of the preceding claims, characterized in that the tube (A) and the partitions (B) are of larger dimensions than the tube (Al) and the partitions (1) for the device with very high explosions.  18) Device according to any one of the preceding claims, characterized in that the box (D) can be refrigerated directly inside at the inlet by the tube (A)  19) Device according to any one of the preceding claims, characterized in that the case (D) can be refrigerated by an envelope enclosing the case  20) Device according to any one of the preceding claims, characterized in that the partitions (B) of large diameter can be fixed by mechanical technical means not shown.