GB2050503A - Noise Mufflers for Valves in Compressed Air Equipment - Google Patents
Noise Mufflers for Valves in Compressed Air Equipment Download PDFInfo
- Publication number
- GB2050503A GB2050503A GB8008465A GB8008465A GB2050503A GB 2050503 A GB2050503 A GB 2050503A GB 8008465 A GB8008465 A GB 8008465A GB 8008465 A GB8008465 A GB 8008465A GB 2050503 A GB2050503 A GB 2050503A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sound
- inlet
- housing
- deadening material
- noise
- 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.)
- Withdrawn
Links
- 239000000463 material Substances 0.000 claims abstract description 30
- 239000012535 impurity Substances 0.000 description 7
- 230000035515 penetration Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 230000001914 calming effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/002—Air treatment devices
- B60T17/008—Silencer devices
-
- 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
-
- 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
- F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/027—Throttle passages
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/027—Throttle passages
- F16L55/02745—Throttle passages by passing through a mass of particles or a porous member
-
- 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
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
- F01N2470/24—Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Exhaust Silencers (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
- Self-Closing Valves And Venting Or Aerating Valves (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
A housing containing sound- deadening material 3 bounding an expansion region 5 has an inlet 2 at one end and an outlet at the other end and at least one passage 4 extends longitudinally through the sound- deadening material to connect the expansion region 5 to the outlet. The end of the, or each, passage 4 is offset with respect to the, or each, inlet aperture. <IMAGE>
Description
SPECIFICATION
Noise Muffler for Valve Devices in Compressed
Air Equipment
The invention relates to noise mufflers for valve devices in compressed air equipment, especially in vehicle braking systems.
Noise mufflers of this type are intended to reduce the blow-off noise which is produces, for example, when superfluous compressed air is discharged into the atmosphere from compressed air brake systems) to a sound level prescribed by the authorities. The noise muffler is generally fitted to a valve device built into or attached to a compressed air line system of the braking equipment, which valve device discharges into the atmosphere as part of its function.
In particular, it is the pressure regulators and relay valves (intended to regulate the operating pressure in compressed air braking systems) which are equipped with noise mufflers, since the sudden discharging into the atmosphere when a particular tank pressure is reached causes loud noises to be produced.
Noise mufflers are known which, in order to damp the flow of air, consist of resistance or deadening elements arranged in hollow bodies and deflecting the air flow as a result of their transverse position with respect to the air flow.
A noise muffler of this type, for compressed air braking systems, is described in German
Offenlegungsschrift 22 53 995. This noisedamping device consists of a closed hollow body with sound-deadening elements composed of resilient material and with lateral air outlet channels leading out through the walls of the hollow body.
Noise mufflers constructed in this way only achieve an adequate effect, however, if they are of comparatively large volume. Moreover, although impurities and moisture from the braking system are eliminated by means of a separation apertuere in an end wall of the hollow body, dirt can penetrate through the lateral air outlet channels from outside and may block up the muffler. The same disadvantage applies to another form of noise muffling device which is open on all sides and composed of sinter material, while a still further form of noise muffler which is constructed on the exhaust principle (i.e. which consists of a body containing perforated metal plates connected in series and provided with central holes) has the disadvantage that it must be of relatively long construction in order to achieve adequate sound deadening.
An object of the present invention is to make it possible to provide a noise muffler which is not readily dirtied by impurities and moisture from the compressed air system, or in which dirtying is reduced to a minimum, and which is so designed that the penetration of dirt from outside can easily be prevented. In view of the limited space which is usually available to accommodate noise mufflers, a further object is to provide a muffler which can be manufactured with comparatively
small dimensions. It is also desirable that a noise
muffler should not affect substantially the
operation of the valves and apparatus with which
it is associated or produced an undesirable
deterioration in the venting times.
The present invention provides a noise
muffler for valve devices in compressed air
equipment, comprising a housing with an inlet
and an outlet in respective, opposed, end walls of
the housing and a sound-deadening material
arranged within the housing, there being an
expansion area within the housing adjacent the
inlet and limited by the sound-deadening
material, and at least one passage running
through the sound-deadening material
substantially longitudinally of the housing to
connect the expansion area with the outlet in the
second end wall of the housing, the or each
passage being so arranged that the end of the
passage nearest to the inlet is offset with respect
to the or each inlet aperture.
The invention will now be described in
greater detail, with reference to two exemplary
embodiments which are illustrated in the
drawings, in which
Figure 1 shows a noise muffler for valve
devices which have a bunched central outlet, and
Figure 2 shows a noise muffler for valve
devices with outlets which are not bunched together but are distributed over a certain radius.
The noise muffler shown in Figure 1 is for valve
devices of a braking system and consists of a
cylindrical housing 1 which is open at one end
and has a central inlet 2 at the other end, and the
cavity of which contains sound-deadening
material 3. In principle, any porous and air
permeable material may be used as the sound
deadening material 3, for example rock wool,
spun glass (heat-resistant) or reticulated
polyurethane foam (very high permeability to air).
Outside the central air entry region, i.e. near the
walls of the cylinder, several passages 4 are
provided which penetrate longitudinally through
the sound-deadening material 3, with the
diameter of the passages and the nature of the
sound-deadening material 3 being so selected
that the venting times and/or the operation of the
braking system remain unaffected by the
presence of the muffler. A free space remaining in
the housing at the inlet end above the sound
deadening material 3 acts as an expansion area 5
for the expansion of compressed air flowing in by
way of the inlet 2. The open end of the housing
(the outlet end) is closed by a cover acting as a
non-return valve 6 which prevents the penetration
of spray and dirt.
The operation of the noise muffler which has
been described with reference to Fig. 1 is as
follows:
Compressed air flowing out of a valve
device of the braking system is first led by way of
the inlet 2 and inlet aperture 8 into the expansion
area 5 and then onto the upper baffle surface 7
formed by the sound-deadening material 3. The
expansion area 5 produces a uniform distribution
of pressure over the sound-deadening material 3.
An addition air-permeable baffle plate 7a
which is provided in the expansion area 5 protects
the baffle surface 7 from overloading.
The air flow is discharged through both the
sound-deadening material 3 and the free
passages 4 out into the atmosphere by way of the
non-return valve 6.
The housing 1 which is completely sealed by
means of the non-return valve 6 ensures that the
noise muffler operates effectively without being
affected by outside influences.
The sound energy is substantially absorbed as
a result of the incoming air flow being aimed
directly onto the baffle plate 7a and/or baffle
surface of the sound-deadening material 3, and
the calming effect achieved by the simultaneous
free expansion of the air in the expansion area 5
and the uniform diffusion through the sound
deadening material, and also by the deflection
and friction of the part streams of the air flow led
through the free passages 4.
The configuration of the various features of the
noise muffler, namely baffle surface 7 and
additional baffle plate 7a (when present),
expansion area 5, sound-deadening material 3
and free passages 4, allow moisture and
impurities produced in the braking system to flow
readily through the muffler: at the same time, the
closure 6 at the outlet end prevents impurities
entering from outside and, in this way, the noise
muffler is protected against becoming blocked.
In Fig. 2 of the drawings, the reference
numerals used correspond, where possible to
those used in Fig. 1. In the muffler shown in Fig.
2, due to the form of the connecting flange of the
valve device for the mounting of the muffler, the inlet 2 has several inlet openings 9. As a
consequence, following the principle of the
impact of inflowing air on baffle surface 7 of the
sound-deadening material 3 (according to Figure
1), there is a single free passage 10 through the
material 3, set in the centre of the muffler.
In this case, the passage 10 is lined by a plate
11 which could be omitted but which, when
present, is perforated to allow the penetration of
air from the sound-deadening material 3 into the
passage 10, this being necessary for effective
operation of the device. Similar perforated plates
could be used to line the passages 4 in the Figure
1 embodiment.
A non-return valve (not shown) of appropriate
form, corresponding to the non-return valve 6 of
Figure 1, would be associated with the outlet 12
in Figure-2 to prevent impurities entering the
muffler from outside.
The operation of this embodiment is the same
as that described with reference to Figure 1 and,
although only a single passage 10 is shown
through the sound-deadening material 3, several
passages could be provided if appropriate having regard to the positions of inlet openings 9.
In each of the embodiments described above, due to the introduction of longitudinal channel(s) 10, 4 running through the air-permeable material 3 contained in the housing 1 (in contrast to lateral air passages used in prior art mufflers), there is only the lower discharge aperture 12 to be protected from the action of impurities and moisture from the outside. At the same time the, of each, vertical passage 10, 4 allows any moisture and impurities produced in the braking system to flow out through the muffler, and the position chosen for the passage(s), which allows only an indirect inflow of the compressed air coming from the valve, ensures an optimum damping effect.
Finally, mufflers in accordance with the invention can be used for noise reduction generally, in any system in which air is blown off into the atmosphere, and are not restricted to use on braking systems.
Claims (7)
1. A noise muffler for valve devices in compressed air equipment, comprising a housing with an inlet and an outlet inrespective, opposed, end walls of the housing and a sound-deadening material arranged within the housing, there being an expansion area within the housing adjacent the inlet and limited by the sound-deadening material, and at least one passage running through the sound-deadening material substantially longitudinally of the housing to connect the expansion area with the outlet in the second end wall of the housing, the of each passage being so arranged that the end of the passage nearest to the inlet is offset with respect to the or each inlet aperture.
2. A noise muffler according to claim 1, in which the outlet end wall of the housing is provided with a non-return valve opening to the exterior of the housing.
3. A noise muffler according to claim 1 or claim 2, in which the inlet comprises a single inlet aperture and there are a plurality of passages running through the sound-deadening material.
4. A noise muffler according to claim 1 or claim 2 in which the inlet comprises a plurality of inlet apertures and a single passage runs through the sound-deadening material.
5. A noise muffler according to claim 1, in which the inlet comprises a plurality of inlet apertures and there are a plurality of passages running through the sound-deadening material.
6. A noise muffler according to any one of claims 1 to 3, in which an air-permeable baffle plate is arranged in the expansion area between the inlet and the sound-deadening material.
7. A noise muffler substantially as described herein with reference to, and as shown in, Fig. 1 or Fig. 2 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792910209 DE2910209A1 (en) | 1979-03-15 | 1979-03-15 | NOISE SHOCK ABSORBER FOR VALVE DEVICES IN COMPRESSED AIR BRAKE SYSTEMS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2050503A true GB2050503A (en) | 1981-01-07 |
Family
ID=6065495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8008465A Withdrawn GB2050503A (en) | 1979-03-15 | 1980-03-13 | Noise Mufflers for Valves in Compressed Air Equipment |
Country Status (5)
| Country | Link |
|---|---|
| DE (1) | DE2910209A1 (en) |
| FR (1) | FR2451530A1 (en) |
| GB (1) | GB2050503A (en) |
| IT (1) | IT8067345A0 (en) |
| SE (1) | SE8001929L (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007046204A1 (en) * | 2007-09-27 | 2009-04-09 | Audi Ag | Gas compressor for internal combustion engine, has gas outlet opening provided at roots-blower and attached to flow distributor with function of pressure pulsation damping, where impact plate is provided in distributor |
| DE102017005984A1 (en) * | 2017-06-23 | 2018-12-27 | Linde Aktiengesellschaft | Silencer device, pressure reduction device and tank system with a pressure reduction device |
| CN113217339A (en) * | 2021-05-27 | 2021-08-06 | 莆田市斯凡登电子商务有限公司 | Silencing equipment for air pressure system |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2922677C2 (en) * | 1979-06-02 | 1982-12-09 | Wabco Fahrzeugbremsen Gmbh, 3000 Hannover | Silencer for valve devices in compressed air brake systems |
| DE3216914A1 (en) * | 1982-05-06 | 1983-11-10 | Wabco Westinghouse Fahrzeugbremsen GmbH, 3000 Hannover | NOISE SHOCK ABSORBER FOR VALVE DEVICES IN COMPRESSED AIR BRAKE SYSTEMS |
| DE3224937C2 (en) * | 1982-07-03 | 1985-05-02 | Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen | Valve device |
| DE3327902A1 (en) * | 1983-08-02 | 1985-02-14 | Knorr-Bremse GmbH, 8000 München | NOISE SHOCK ABSORBER FOR VALVE ARRANGEMENTS IN COMPRESSED AIR SYSTEMS, ESPECIALLY IN VEHICLE AIR BRAKE SYSTEMS |
| DE3832029C2 (en) * | 1988-09-21 | 1997-12-11 | Wabco Gmbh | Compressed air ventilation device |
| DE3901335A1 (en) * | 1989-01-18 | 1990-07-19 | Knorr Bremse Ag | MUFFLER |
| DE4210786C2 (en) * | 1992-04-01 | 1994-11-10 | Bayer Ag | Sound absorbing resonator for pipes |
| DE4237630A1 (en) * | 1992-11-05 | 1994-05-11 | Wabco Westinghouse Fahrzeug | Compressed air ventilation device |
| DE102015111512A1 (en) * | 2015-07-16 | 2017-01-19 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | silencer |
| DE102017122215A1 (en) | 2017-09-26 | 2019-03-28 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Silencer for compressed air systems and a method for its production |
| CN110864180A (en) * | 2019-11-07 | 2020-03-06 | 哈尔滨工程大学 | High-efficient compact sea water pipeline silencer |
| DE102019130610B3 (en) * | 2019-11-13 | 2021-01-21 | Nidec Gpm Gmbh | Soundproofing device for vacuum pumps |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4108276A (en) * | 1976-09-20 | 1978-08-22 | Nelson Industries, Inc. | Vent silencer |
-
1979
- 1979-03-15 DE DE19792910209 patent/DE2910209A1/en not_active Ceased
-
1980
- 1980-03-05 IT IT8067345A patent/IT8067345A0/en unknown
- 1980-03-12 SE SE8001929A patent/SE8001929L/en not_active Application Discontinuation
- 1980-03-13 GB GB8008465A patent/GB2050503A/en not_active Withdrawn
- 1980-03-14 FR FR8005829A patent/FR2451530A1/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007046204A1 (en) * | 2007-09-27 | 2009-04-09 | Audi Ag | Gas compressor for internal combustion engine, has gas outlet opening provided at roots-blower and attached to flow distributor with function of pressure pulsation damping, where impact plate is provided in distributor |
| DE102007046204B4 (en) * | 2007-09-27 | 2015-04-02 | Audi Ag | Gas compressor of an internal combustion engine |
| DE102017005984A1 (en) * | 2017-06-23 | 2018-12-27 | Linde Aktiengesellschaft | Silencer device, pressure reduction device and tank system with a pressure reduction device |
| CN113217339A (en) * | 2021-05-27 | 2021-08-06 | 莆田市斯凡登电子商务有限公司 | Silencing equipment for air pressure system |
Also Published As
| Publication number | Publication date |
|---|---|
| IT8067345A0 (en) | 1980-03-05 |
| SE8001929L (en) | 1980-09-16 |
| FR2451530A1 (en) | 1980-10-10 |
| DE2910209A1 (en) | 1980-09-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |