Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N1/00—Silencing apparatus characterised by method of silencing
  • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
  • F01N1/081—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling by passing the exhaust gases through a mass of particles
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
  • F01N1/00—Silencing apparatus characterised by method of silencing
  • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
  • F01N1/10—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling in combination with sound-absorbing materials

Definitions

• the present invention relates to a silencer in combination with a combustion apparatus or combustion engine
• a silencer in this connection must have such properties that it does not disturb the course of combus ⁇ tion. In the first place it is thus a condition that the flow resistance in the silencer is kept sufficiently low, which has up to now resulted in that in known combustion apparatus with a silencer on the exhaust and/or induction side, the silencer has been formed as far as possible with ' free through-flow. In certain cases the air or gases have passed through steel wool or fibre material with relatively large flow area between the fibres.
• the invention has the object of.providing a silencer combined with a combustion apparatus which gives comparatively very good sound damping, while at the same time the silencer will be easy to clean.
• This problem is solved in accordance with the invention by combining a combustion apparatus with a silencer, formed to guide the induction air or exhaust gases to or from the combustion apparatus through a granulate such as sand, gravel, pellets or similar grainy material.
• a granulate such as sand, gravel, pellets or similar grainy material.
• the silencer can be manufactured at a relatively low price. Cleaning the silencer can be performed in an extremely simple way by quite simply letting the sand run out through an emptying opening in the silencer casing, new and clean sand being subsequently supplied via a filling opening in the casing. This cleaning by exchanging cheap sound-damping material can be carried out in a short time and without special craftsmanship by practically anybody at all. The dirty sand can be subsequently washed in a special plant and can be used again.
• the silencer will also function as a filter which thus signifies cleaning of the air and the exhaust gases
• Fig. 1 is a schematic depiction of an apparatus for pulsating combustion in combination with a silencer in accordance with the invention, placed on the exhaust side and the induction side, respectively,
• Fig. 2 is a view of the wide side of the silencer
• Fig. 3 is a view of the narrow side of the silencer
• Fig. 4 is a section along the line 4-4 in Fig. 3,
• Fig. 5 is a section along the line 5-5 in Fig c 2
• Fig. 6 illustrates an alternative embodiment
• Fig. 7 illustrates a further alternative embodiment.
• the silencer A is formed with a casing 10 in the form of a simple box with two pair of sides 12,12 and 14,14, respectively, and end walls 16,18.
• the casing is intended for use upstanding on the end wall 16, but if so desired it can be also used lying on one side.
• Two parallel, mutually spaced tubular channel members 20,22 are disposed in the casing which members are identic ⁇ ally alike, for which reason only the member 20 is described in the following.
• the member 20 comprises an internal sleeve 24 consist ⁇ ing of metal wire netting rolled up into a sleeve. About this sleeve there is wound a layer of cellular plastics 26 with open cells.
• a pipe stub 28,30 is attached to each member and extends out through the upper end wall of the casing.
• the pipe stub 28 is intended for connection to the induction side of the combustion apparatus 29 in Fig Q 1 in the way illustrated.
• In the upper end wall 18 of the casing there is a filling opening 32 with a cover, and at the bottom end of the casing there is an emptying opening 34 with a cover 0
• the casing has been filled with sand through the opening 32 up to the level 38.
• the granular size of the sand is substantially in the range of about 1 mm when the silencer is connected to the induction side of the apparatus, and suitably in the range of about 3 ram when the silencer is connected to the exhaust side of the apparatus.
• the foamed plastics sheaths 26 on the two tubular elements 20,22 are so constituted that they do not let through grains of sand but allow the through-passage of air or exhaust gases.
• the netting sleeves 24 only form an inner support for the foamed plastics sheaths.
• the silencer illustrated in Fig. 4 has its inlet and outlet, respectively, situated at the same end of the casing 10, and for this reason it is suitable for connectin as a silencer to the induction side of the apparatus, as is indicated schematically in Fig. 1.
• a silencer B connected to the exhaust side and which is depicted separately in Fig. 6 as an alternative embodiment.
• the silencer in Fig. 6 also has a casing 10 and a tubular member 42 comprising a netting and a foamed plastics sleeve round it, the member being connected to an inlet pipe 44.
• the casing is filled with sand 36 in this case as well.
• a tubular member 46 suitably having a larger diameter than the tubular member 42 and of which the upper end portion is closed off by a sealing tube ' 46a, so that the exhaust-gases can only come into the tubular member after having passed a certain amount of sand.
• An inner pipe 48 is inserted in the tubular member 46 to form the outlet pipe, and has its- bottom end 46b situated outside the bottom end of the casing, while its upper end 46c is in the vicinity of the upper end of the tubular member 46.
• tubular members 20,22 in Fig. 4 have their correspondence in two cylindrical helical springs 50,52, the diameters of which are approximately the same as the diameters of the members 20,22.
• the springs can have a wire diameter of 2 mm, for example, but this diameter can be selected greater or smaller according to require- .
• the springs are wound with their turns lying closely adjacent each other, and the gap between the turns can be between 1 and 3 mm according as the diameter of the grains used in the granulate.
• the silencer in accordance with the invention has bee described in conjunction with a combustion apparatus for pulsating combustion, but the silencer in accordance with the invention can naturally be used for other combustion apparatus as well, e.g. diesel engines.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Exhaust Silencers (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20338629

Family Applications (1)

Country Status (2)

Families Citing this family (2)

Family Cites Families (7)

• 1980
  • 1980-08-14 WO PCT/SE1980/000210 patent/WO1981000591A1/en not_active Ceased
• 1981
  • 1981-03-09 EP EP19800901583 patent/EP0034603A1/de not_active Withdrawn

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events