CA1240131A - Packing automobile exhaust silencers - Google Patents
Packing automobile exhaust silencersInfo
- Publication number
- CA1240131A CA1240131A CA000436414A CA436414A CA1240131A CA 1240131 A CA1240131 A CA 1240131A CA 000436414 A CA000436414 A CA 000436414A CA 436414 A CA436414 A CA 436414A CA 1240131 A CA1240131 A CA 1240131A
- Authority
- CA
- Canada
- Prior art keywords
- air flow
- casing
- silencer
- passageway
- glass fibres
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000012856 packing Methods 0.000 title claims abstract description 13
- 230000003584 silencer Effects 0.000 claims abstract description 48
- 239000003365 glass fiber Substances 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 19
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 description 7
- 239000000835 fiber Substances 0.000 description 4
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 4
- 229910052753 mercury Inorganic materials 0.000 description 4
- 239000007789 gas Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000030279 gene silencing Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
-
- 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
- F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing materials
-
- 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
- F01N2310/00—Selection of sound absorbing or insulating material
- F01N2310/02—Mineral wool, e.g. glass wool, rock wool, asbestos or the like
-
- 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
- F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
- F01N2450/06—Inserting sound absorbing material into a chamber
Abstract
ABSTRACT OF THE DISCLOSURE
PACKING AUTOMOBILE EXHAUST SILENCER CASING
An automobile silencer comprising a casing 1, a perforated tube 6 and an end piece 5 is packed with glass fibres by chopping a strand consisting of a plurality of continuous glass fibres into discrete lengths between two rollers and allowing the discrete lengths to be carried into the casing 1 in an air flow. The individual fibres of each discrete length separate from each other in the casing 1 to form the desired fluffed-up wool-like material. The air flow through the casing 1 may be established by a vacuum applied to one end of the tube 6 or by an air jet directed into the casing 1.
PACKING AUTOMOBILE EXHAUST SILENCER CASING
An automobile silencer comprising a casing 1, a perforated tube 6 and an end piece 5 is packed with glass fibres by chopping a strand consisting of a plurality of continuous glass fibres into discrete lengths between two rollers and allowing the discrete lengths to be carried into the casing 1 in an air flow. The individual fibres of each discrete length separate from each other in the casing 1 to form the desired fluffed-up wool-like material. The air flow through the casing 1 may be established by a vacuum applied to one end of the tube 6 or by an air jet directed into the casing 1.
Description
~40131 PACKING AUTOMOBILE EXHAUST SILENCER CASINGS
This invention relates to the packing of automobile exhaust silencer casines ~
Such silencer casings contain packing in order to assist in silencing exhaust gases from the vehicle engine by virtue of conversion of kinetic energy of the exhaust gases into mechanical displacements of the packing and thus heating thereof.
One of the materials used to pack such silencer casings is glass fibre fluffed up into a wool-like consistency. Thi3 material can be produced by chopping continuous strands of glass fibre.
In the past such si]encer casings have been packed with such material manually and, to assist in this process, it has been proposed to apply a vacuum to one end of the silencer casing.
In order to adapt the process for automatic operation, gla~s f~bre mPter~al in wool-like form has been fed into a hopper, from which it passes along ducts before being metered into individual quantities, each suitable for packing one silencer. However, the material has been prone to clog in the ducts and this has made the accurate metering of the material difficult, if the expense of weigh pans is to be avoided.
1240~31 According to a first aspect of this invention there is provided a method of packing an automobile silencer casing comprising the steps of:
establishing an air flow into one end of the silencer casing and then out of the other end through a perforated tube passing therethrough; and allowing discrete lengths of glass fibres to be carried into the silencer casing in the air flow, wherein the air flow i8 passed through a restricted passageway before entering the 3ilencer casing and a strand consisting of a plurality of continuous glass fibres i3 chopped into discrete lengths upstream of the restricted passageway ~o that as the discrete lengths are formed they are carried by the air flow through the restricted passageway and individual fibres in each discrete length separate from each other in a region of turbulence created thereby to form a wool-like material.
It has been found that the individual fibres of each discrete length of strand can 3eparate as they are being carried into the silencer in the air flow 90 that the packing fluffs up in the desired way in the silencer casing itself or as it is entering.
The strand, or roving, advantageously contains at least one hundred, preferably at least a thousand, individual continuous glass fibres whose diameter is advantageously less than 30 micron3 and perferably less than 15 microns. The fibres of the roving are preferably non-twisted~
~2~0~3~
Advantageously the roving i~ driven from two rollers in contact with each other; this makes it ea~y to meter accurate quantities of glass fibre into each silencer casing, since it is only necessary to leave the rollers running for a certain period of time in order to know exactly how much glass fibre has been fed into the silencer. A roller may also be provided for chopping the fibres, and they may be projected with the as~istance of an air blast.
Preferably, the air flows through a restricted passageway with a diameter of less than one inch (2.54cm), before it enters the casing: the fibre being fluffed up in the region of turbulence created thereby. The passageway may be formed by the narrow end of a tapering tubular member, the wide end of which receives the discrete length~. The taper may be from 15 to 75 included angle.
The air flow may be produced by means of a vacuum applied to where the air flow leaves the silencer casing. The vacuum applied to the silancer casing may be at least one inch of mercury (525N/m ), preferably at least five inches of mercury (2624N/m2), and advantageously between seven and a hfiif and ten and a half inches of mercury (3936-6560N/m2).
i The air flow may be established by means of a jet of compressed air directed into the passageway. In the case of the tapering tubular member referred to, the jet preferably feeds into the passageway at an angle cf 7.5 to 37.5 to the axis of the tubular member. The compressed air pressure should be at lea~t 70 pounds per square inch (483K~/m2).
:12~0~L3~
According to a second aspect of this invention there is provided apparatus for packing an automobile exhaust silencer casing comprising: means for establishing an air flow into one end of the silencer casing and then out of the other end through a perforated tube passing therethrough; means for supplying discrete lengths of glass fibre to be carried into the silencer casing in the air flow; and means for positioning upstream of the silencer casing to chop a strand consisting of a plurality of continuous glass fibres into discrete lengths and by a restricted passageway through which the air flow pa~ses before entering the silencer casing, the arrangement being such that, in use, as the discrete lengths are formed they are carried by the air flow through the restricted passageway so that individual fibres in each discrete length separate from each other in a region of turbulence created thereby to form a wool-like material.
According to a further a~pect of this invention there is provided an automobile exhaust silencer casing packed with discrete lengths of glass fibre in which the discrete lengths are fluffed up to produce a wool-like material.
Figure 1 is partly sectional view of first embodiment of apparatus according to this invention;
Figure 2 is a side view of a gun used in the apparatus of Figure 1 for feeding roving into the silence casing;
Figure 3 is a front view of the gun shown in ~igure 2;
1~4013~
Figure 4 is a plan view of the gun shown in Figure 2; and Fieure 5 is a schematic view of a second embodiment of apparatus according to this invention.
Referring to Figure 1, the first embodiment of apparatus for packing a 3ilencer casing 1 comprises a vacuum producing apparatus 2, a sealing apparatus 3 and a gun 4.
The casing of the silencer is circular in section, and one end of it has been closed by an end piece 5, which supports a perforated tube 6 running along the length of the silencer casing 1. The end piece 5 supports a stub pipe 7 which connects to the rest of the exhaust assembly in use. A similar end piece bearing a stub pipe is welded to the other end of the silencer when it has been packed.
The vacuum producing apparatus has a rubber sealing member 8 which fits tightly around the stub pipe 7. The vacuum is produced by means of a centrifugal compressor (not shown) driven by a forty horse power (30 kw) motor (not shown). This apparatus produces a vacuum of around ten inches of mercury (5248N/m2).
The sealing apparatus 3 likewise includes a sealing member 9 which seals against the open end of the casing and also blocks off the open end of the perforated tube 6, since this must not be filled with any packing material. The sealing member has 8 circular aperture 10 whose diameter is ~/4 inch (1.9 cm).
Referring to ~igure 2, the roving fed into the gun 4 consists of around two thousand mono-filamentary continuous glass fibres, whose diameters lie between about ~ix and twelve microns. The fibres in the roving are parallel to each other, that i3, the roving i3 not twisted. The roving i~
fed from a spool (not shown) containing a length of about a couple of hundred meters of the roving.
The gun has an air powered motor, contained in housing 11, to which rubber roller 12 is coaxially attached. The roving is driven by meqns of rubber roller 12 and steel roller 13 which is hard in contact with roller 12. The roving is cut into discrete lengths by means of a cutter 14 mounted diametrioally through a further roller 15. ~very half revolution of roller 15, the roving is severed at the point of contact with roller 12. The rollers are contained in a housing 16 having an inlet 17 and an outlet 18.
The air exhaust from the air powered motor is fed into the housing 16 and, since the area of the outlet 18 is much greater than that of the irlet 17, the chopped lengths of roving are projected out of the gun with the aid of an air blast.
In operation of the method of the invention, a silencer casing l to be filled is fitted onto the vacuum producing apparatus 2 and a sealing apparatus is brought up to the open end of the silencer. The vacuum pump is started. The gun 4 is then run and left running for a pre-determined period of time. This pre-determined period correqponds to the desired weight of glass fibre it iq desired to pack the particular silencer with, and this can be calculated simply from the weight per unit length of the roving and the velocity at which the roving is fed through the gun.
1~:401`3~
The chopped lengths of roving projected from the gun are all 3ucked through the aperture lO in the ~ealing member 9 bscause of the vacuum applied at the other end of the silencer casing, and the silencer i9 gradually filled with glass fibre. It has been found that the fibres of each chopped length of roving separate either before they enter the silencer casing or while they are in the silencer casing (probably the separation mainly takes place within the silencer), and this results in the production of the desired wool-like form of the glas~ fibre in the ~ilencer. The air flow within the silencer will of course be turbulent since it is being 3ucked through the perforated tube 6. Ihe lengths of fibre do not pass into the tube 6 themselves.
Among the advantages of the invention are that it is possible to accurately meter the quantities of glass fibre with which each silencer is packed, and that the ducting required for handling the wocl-like glass fibre i~
dispensed with.
Various modifications are of cour3e possible, for e~ample, tests have also been carried out with an acurate aperture lO in the sealing member, the length of which i9 around four times its diameter. Although the roving "fluffled-up" in a satisfactory manner, it was nevertheless found that it "fluffed-up" better with the 3/4 inch (l.9 cm) diameter aperture referred to earlier.
Referring to ~igure 5, the second form of apparatus differs from the first in that there is no vacuum required to draw the roving pieces into the ailencer, rather they are drawn in carried in an air flo~.
~L2~101`3~
A silencer 20 to be filled is closed at the lower end as seen in the drawing by a closing plate 21 which has an aperture through which a perforated tube 22 of the silencer e~tends. The silencer i9 mounted on a platform 23 through which air can pass. The upper end of the silencer as seen in the drawing i9 connected to the apparatus, in particular to a closing plate 24 which carries a plug 25 for closing the end of the perforated tube 22.
The chopped strands of roving are fed into the silencer casing via a tube 26 and conical member 27, the tube 26 being sealed in an aperture in the closing plate 24.
A gun 28 supplies roving to the wide end of the conical member: the gun 28 is identical to the gun 4 of the first apparatus except that air does not assist in projecting the cut strands of roving from the gun, the cut strands being projected solely be the rotation of the rollers. The roving using is the same as in the first apparatus.
A narrow tube 29 opens into the tube 26, and compressed air is supplied to its other end.
It has been found that the compressed air fed along the tube 26 draws large quantities of air into the conical member 27, and through the tube 26 into the silencer casing. In the process, the cut strands of roving are carried in the air flow into the silencer casing. The air flow leaves the silencer casing via the perforated tube and its open end which passes through the clo~ing plate 21. It has also been found that the cut strands are "fluffed-up" in the process, and that the casing is filled in a very satisfactory manner.
12~101~
g E2amples of 3uitable dimensions and presoures are: tube 26, three inche~
(7.62 cm) long, one half inch (1.27 cm) diameter; conical member 27, semi-angle 30 , diameter at wide end, three inches (7.62 cm); tube 29, angle to axis of conical member, 35 , air pressure 100 pounds per square inch (690 KN/m ).
It is believed that the narrow diameter of the tube 26 is important in fluffin~-up" the cut strands of roving, since only with a narrow diameter iB sufficient turbulence created in the tube to achieve thi~. It i~
believed that the narrow opening lO in the first apparatus is also respon~ible for creating the necessary turbulence. The narrowsr the diameter, the smaller the compressed air pressure or vacuum needed to fluff-up the fibre, but if the diameter is too ~mall, the restriction 1 prone to clogging.
This invention relates to the packing of automobile exhaust silencer casines ~
Such silencer casings contain packing in order to assist in silencing exhaust gases from the vehicle engine by virtue of conversion of kinetic energy of the exhaust gases into mechanical displacements of the packing and thus heating thereof.
One of the materials used to pack such silencer casings is glass fibre fluffed up into a wool-like consistency. Thi3 material can be produced by chopping continuous strands of glass fibre.
In the past such si]encer casings have been packed with such material manually and, to assist in this process, it has been proposed to apply a vacuum to one end of the silencer casing.
In order to adapt the process for automatic operation, gla~s f~bre mPter~al in wool-like form has been fed into a hopper, from which it passes along ducts before being metered into individual quantities, each suitable for packing one silencer. However, the material has been prone to clog in the ducts and this has made the accurate metering of the material difficult, if the expense of weigh pans is to be avoided.
1240~31 According to a first aspect of this invention there is provided a method of packing an automobile silencer casing comprising the steps of:
establishing an air flow into one end of the silencer casing and then out of the other end through a perforated tube passing therethrough; and allowing discrete lengths of glass fibres to be carried into the silencer casing in the air flow, wherein the air flow i8 passed through a restricted passageway before entering the 3ilencer casing and a strand consisting of a plurality of continuous glass fibres i3 chopped into discrete lengths upstream of the restricted passageway ~o that as the discrete lengths are formed they are carried by the air flow through the restricted passageway and individual fibres in each discrete length separate from each other in a region of turbulence created thereby to form a wool-like material.
It has been found that the individual fibres of each discrete length of strand can 3eparate as they are being carried into the silencer in the air flow 90 that the packing fluffs up in the desired way in the silencer casing itself or as it is entering.
The strand, or roving, advantageously contains at least one hundred, preferably at least a thousand, individual continuous glass fibres whose diameter is advantageously less than 30 micron3 and perferably less than 15 microns. The fibres of the roving are preferably non-twisted~
~2~0~3~
Advantageously the roving i~ driven from two rollers in contact with each other; this makes it ea~y to meter accurate quantities of glass fibre into each silencer casing, since it is only necessary to leave the rollers running for a certain period of time in order to know exactly how much glass fibre has been fed into the silencer. A roller may also be provided for chopping the fibres, and they may be projected with the as~istance of an air blast.
Preferably, the air flows through a restricted passageway with a diameter of less than one inch (2.54cm), before it enters the casing: the fibre being fluffed up in the region of turbulence created thereby. The passageway may be formed by the narrow end of a tapering tubular member, the wide end of which receives the discrete length~. The taper may be from 15 to 75 included angle.
The air flow may be produced by means of a vacuum applied to where the air flow leaves the silencer casing. The vacuum applied to the silancer casing may be at least one inch of mercury (525N/m ), preferably at least five inches of mercury (2624N/m2), and advantageously between seven and a hfiif and ten and a half inches of mercury (3936-6560N/m2).
i The air flow may be established by means of a jet of compressed air directed into the passageway. In the case of the tapering tubular member referred to, the jet preferably feeds into the passageway at an angle cf 7.5 to 37.5 to the axis of the tubular member. The compressed air pressure should be at lea~t 70 pounds per square inch (483K~/m2).
:12~0~L3~
According to a second aspect of this invention there is provided apparatus for packing an automobile exhaust silencer casing comprising: means for establishing an air flow into one end of the silencer casing and then out of the other end through a perforated tube passing therethrough; means for supplying discrete lengths of glass fibre to be carried into the silencer casing in the air flow; and means for positioning upstream of the silencer casing to chop a strand consisting of a plurality of continuous glass fibres into discrete lengths and by a restricted passageway through which the air flow pa~ses before entering the silencer casing, the arrangement being such that, in use, as the discrete lengths are formed they are carried by the air flow through the restricted passageway so that individual fibres in each discrete length separate from each other in a region of turbulence created thereby to form a wool-like material.
According to a further a~pect of this invention there is provided an automobile exhaust silencer casing packed with discrete lengths of glass fibre in which the discrete lengths are fluffed up to produce a wool-like material.
Figure 1 is partly sectional view of first embodiment of apparatus according to this invention;
Figure 2 is a side view of a gun used in the apparatus of Figure 1 for feeding roving into the silence casing;
Figure 3 is a front view of the gun shown in ~igure 2;
1~4013~
Figure 4 is a plan view of the gun shown in Figure 2; and Fieure 5 is a schematic view of a second embodiment of apparatus according to this invention.
Referring to Figure 1, the first embodiment of apparatus for packing a 3ilencer casing 1 comprises a vacuum producing apparatus 2, a sealing apparatus 3 and a gun 4.
The casing of the silencer is circular in section, and one end of it has been closed by an end piece 5, which supports a perforated tube 6 running along the length of the silencer casing 1. The end piece 5 supports a stub pipe 7 which connects to the rest of the exhaust assembly in use. A similar end piece bearing a stub pipe is welded to the other end of the silencer when it has been packed.
The vacuum producing apparatus has a rubber sealing member 8 which fits tightly around the stub pipe 7. The vacuum is produced by means of a centrifugal compressor (not shown) driven by a forty horse power (30 kw) motor (not shown). This apparatus produces a vacuum of around ten inches of mercury (5248N/m2).
The sealing apparatus 3 likewise includes a sealing member 9 which seals against the open end of the casing and also blocks off the open end of the perforated tube 6, since this must not be filled with any packing material. The sealing member has 8 circular aperture 10 whose diameter is ~/4 inch (1.9 cm).
Referring to ~igure 2, the roving fed into the gun 4 consists of around two thousand mono-filamentary continuous glass fibres, whose diameters lie between about ~ix and twelve microns. The fibres in the roving are parallel to each other, that i3, the roving i3 not twisted. The roving i~
fed from a spool (not shown) containing a length of about a couple of hundred meters of the roving.
The gun has an air powered motor, contained in housing 11, to which rubber roller 12 is coaxially attached. The roving is driven by meqns of rubber roller 12 and steel roller 13 which is hard in contact with roller 12. The roving is cut into discrete lengths by means of a cutter 14 mounted diametrioally through a further roller 15. ~very half revolution of roller 15, the roving is severed at the point of contact with roller 12. The rollers are contained in a housing 16 having an inlet 17 and an outlet 18.
The air exhaust from the air powered motor is fed into the housing 16 and, since the area of the outlet 18 is much greater than that of the irlet 17, the chopped lengths of roving are projected out of the gun with the aid of an air blast.
In operation of the method of the invention, a silencer casing l to be filled is fitted onto the vacuum producing apparatus 2 and a sealing apparatus is brought up to the open end of the silencer. The vacuum pump is started. The gun 4 is then run and left running for a pre-determined period of time. This pre-determined period correqponds to the desired weight of glass fibre it iq desired to pack the particular silencer with, and this can be calculated simply from the weight per unit length of the roving and the velocity at which the roving is fed through the gun.
1~:401`3~
The chopped lengths of roving projected from the gun are all 3ucked through the aperture lO in the ~ealing member 9 bscause of the vacuum applied at the other end of the silencer casing, and the silencer i9 gradually filled with glass fibre. It has been found that the fibres of each chopped length of roving separate either before they enter the silencer casing or while they are in the silencer casing (probably the separation mainly takes place within the silencer), and this results in the production of the desired wool-like form of the glas~ fibre in the ~ilencer. The air flow within the silencer will of course be turbulent since it is being 3ucked through the perforated tube 6. Ihe lengths of fibre do not pass into the tube 6 themselves.
Among the advantages of the invention are that it is possible to accurately meter the quantities of glass fibre with which each silencer is packed, and that the ducting required for handling the wocl-like glass fibre i~
dispensed with.
Various modifications are of cour3e possible, for e~ample, tests have also been carried out with an acurate aperture lO in the sealing member, the length of which i9 around four times its diameter. Although the roving "fluffled-up" in a satisfactory manner, it was nevertheless found that it "fluffed-up" better with the 3/4 inch (l.9 cm) diameter aperture referred to earlier.
Referring to ~igure 5, the second form of apparatus differs from the first in that there is no vacuum required to draw the roving pieces into the ailencer, rather they are drawn in carried in an air flo~.
~L2~101`3~
A silencer 20 to be filled is closed at the lower end as seen in the drawing by a closing plate 21 which has an aperture through which a perforated tube 22 of the silencer e~tends. The silencer i9 mounted on a platform 23 through which air can pass. The upper end of the silencer as seen in the drawing i9 connected to the apparatus, in particular to a closing plate 24 which carries a plug 25 for closing the end of the perforated tube 22.
The chopped strands of roving are fed into the silencer casing via a tube 26 and conical member 27, the tube 26 being sealed in an aperture in the closing plate 24.
A gun 28 supplies roving to the wide end of the conical member: the gun 28 is identical to the gun 4 of the first apparatus except that air does not assist in projecting the cut strands of roving from the gun, the cut strands being projected solely be the rotation of the rollers. The roving using is the same as in the first apparatus.
A narrow tube 29 opens into the tube 26, and compressed air is supplied to its other end.
It has been found that the compressed air fed along the tube 26 draws large quantities of air into the conical member 27, and through the tube 26 into the silencer casing. In the process, the cut strands of roving are carried in the air flow into the silencer casing. The air flow leaves the silencer casing via the perforated tube and its open end which passes through the clo~ing plate 21. It has also been found that the cut strands are "fluffed-up" in the process, and that the casing is filled in a very satisfactory manner.
12~101~
g E2amples of 3uitable dimensions and presoures are: tube 26, three inche~
(7.62 cm) long, one half inch (1.27 cm) diameter; conical member 27, semi-angle 30 , diameter at wide end, three inches (7.62 cm); tube 29, angle to axis of conical member, 35 , air pressure 100 pounds per square inch (690 KN/m ).
It is believed that the narrow diameter of the tube 26 is important in fluffin~-up" the cut strands of roving, since only with a narrow diameter iB sufficient turbulence created in the tube to achieve thi~. It i~
believed that the narrow opening lO in the first apparatus is also respon~ible for creating the necessary turbulence. The narrowsr the diameter, the smaller the compressed air pressure or vacuum needed to fluff-up the fibre, but if the diameter is too ~mall, the restriction 1 prone to clogging.
Claims (13)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of packing an automobile silencer easing comprising the steps of: establishing an air flow into one end of the silencer casing and then out of the other end through a perforated tube passing therethrough; and allowing discrete lengths of glass fibres to be carried into the silencer casing in the air flow, wherein the air flow is passed through a restricted passageway before entering the silencer casing and a strand consisting of a plurality of continuous glass fibres is chopped into discrete lengths upstream of the restricted passageway so that as the discrete lengths are formed they are carried by the air flow through the restricted passageway and individual fibres in each discrete length separate from each other in a region of turbulence created thereby to form a wool-like material.
2. A method as claimed in claim 1, in which the strand consists of at least one hundred continuous glass fibres.
3. A method as claimed in claim 2, in which the strand consists of at least a thousand continuous glass fibres.
4. A method as claimed in claim 1, in which the diameters of the continuous glass fibres are less than thirty microns.
5. A method as claimed in claim 4, in which the diameters of the continuous glass fibres are less than fifteen microns.
6. A method as claimed in claim 1, in which the strand is fed between two rollers engaging one another, one of which is driven.
7. A method as claimed in claim 6, in which the strand passes between a pair of rollers, one of which has a cutter mounted diametrically therethrough.
8. A method as claimed in claim 6 or 7, in which the discrete lengths are projected through the passageway with the assistance of an air blast.
9. A method as claimed in claim 1, in which the diameter of the passageway is less than one inch (2.54 cm).
10. A method as claimed in claim 9, in which the passageway is formed by the narrow end of a tapering tube, the wide end of which receives the discrete lengths.
11. A method as claimed in claim 1, in which the air flow is established by means of a vacuum applied where the air flow leaves the silencer casing.
12. A method as claimed in claim 10, in which the air flow is established by means of a jet of compressed air directed into the passageway.
13. A method as claimed in claims 10 and 12, in which the jet is inclined with respect to the axis of the tapering tube.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8225865 | 1982-09-10 | ||
| GB08225865A GB2127093B (en) | 1982-09-10 | 1982-09-10 | Packing automobile exhaust silencer casing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1240131A true CA1240131A (en) | 1988-08-09 |
Family
ID=10532835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000436414A Expired CA1240131A (en) | 1982-09-10 | 1983-09-09 | Packing automobile exhaust silencers |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0106481B1 (en) |
| JP (1) | JPS59131717A (en) |
| CA (1) | CA1240131A (en) |
| DE (1) | DE3369360D1 (en) |
| GB (1) | GB2127093B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8330799D0 (en) * | 1983-11-18 | 1983-12-29 | Tba Industrial Products Ltd | Glass fibre products |
| DE3476241D1 (en) * | 1983-11-18 | 1989-02-23 | Tba Industrial Products Ltd | Glass fibre products |
| GB2162577B (en) * | 1984-02-14 | 1987-07-01 | Unipart Group Ltd | Method of and apparatus for packing exhaust silencer casings |
| US6446750B1 (en) * | 2001-03-16 | 2002-09-10 | Owens Corning Fiberglas Technology, Inc. | Process for filling a muffler shell with fibrous material |
| US6581723B2 (en) * | 2001-08-31 | 2003-06-24 | Owens Corning Composites Sprl | Muffler shell filling process, muffler filled with fibrous material and vacuum filling device |
| US6607052B2 (en) | 2001-09-12 | 2003-08-19 | Owens Corning Composites Sprl | Muffler shell filling process and muffler filled with fibrous material |
| US8590155B2 (en) | 2009-06-03 | 2013-11-26 | Ocv Intellectual Capital, Llc | Apparatus for and process of filling a muffler with fibrous material utilizing a directional jet |
| JP6317561B2 (en) * | 2013-10-16 | 2018-04-25 | 株式会社Ｓｕｂａｒｕ | Fiber filling apparatus and fiber filling method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1279472A (en) * | 1969-10-30 | 1972-06-28 | Harmo Ind Ltd | Improvements in or relating to absorbent devices |
| SE445942B (en) * | 1982-04-06 | 1986-07-28 | Volvo Ab | Muffler AND METHOD AND DEVICE FOR MANUFACTURING THIS |
-
1982
- 1982-09-10 GB GB08225865A patent/GB2127093B/en not_active Expired
-
1983
- 1983-09-01 EP EP83305077A patent/EP0106481B1/en not_active Expired
- 1983-09-01 DE DE8383305077T patent/DE3369360D1/en not_active Expired
- 1983-09-09 CA CA000436414A patent/CA1240131A/en not_active Expired
- 1983-09-10 JP JP16737983A patent/JPS59131717A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59131717A (en) | 1984-07-28 |
| EP0106481B1 (en) | 1987-01-21 |
| GB2127093B (en) | 1986-01-29 |
| GB2127093A (en) | 1984-04-04 |
| DE3369360D1 (en) | 1987-02-26 |
| EP0106481A2 (en) | 1984-04-25 |
| EP0106481A3 (en) | 1984-07-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |