GB2039613A - Silencing means for a compressor installation - Google Patents

Silencing means for a compressor installation Download PDF

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Publication number
GB2039613A
GB2039613A GB8000985A GB8000985A GB2039613A GB 2039613 A GB2039613 A GB 2039613A GB 8000985 A GB8000985 A GB 8000985A GB 8000985 A GB8000985 A GB 8000985A GB 2039613 A GB2039613 A GB 2039613A
Authority
GB
United Kingdom
Prior art keywords
capillary
silencing means
air
surplus
throttling device
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Withdrawn
Application number
GB8000985A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daimler Benz AG
Original Assignee
Daimler Benz AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Daimler Benz AG filed Critical Daimler Benz AG
Publication of GB2039613A publication Critical patent/GB2039613A/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F16L55/02763—Throttle passages using an element with multiple tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0027—Pulsation and noise damping means
    • F04B39/0055—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes
    • F04B39/0061—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes using muffler volumes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0027—Pulsation and noise damping means
    • F04B39/0083—Pulsation and noise damping means using blow off silencers

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Compressor (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Pipe Accessories (AREA)

Abstract

For silencing air blown off from a compressed-air vessel via an over- pressure-relief valve a silencer which reduces the jet energy of the discharging air is disposed on the outlet side of the said valve. The silencer may comprise a capillary throttling device 3 or devices with a plurality of parallel capillary ducts 6 which are flared at their inlet ends 7. Cavities 9 may be interposed between such throttling devices disposed in series. A tubular shield 8 adjoining the silencer at the outlet end may extend out of or be formed as part of an enclosing casing 1. <IMAGE>

Description

SPECIFICATION Silencing means for a compressor installation This invention relates to silencing means for a compressor installation, particularly but not exclusively for a motor vehicle, comprising a compressed - air vessel and an overpressure-relief valve by means of which surplus compressed air is blown off into the atmosphere.
Compressor installations, particularly for motor vehicles, may be designed so that when the adjusted service or operating pressure of, say, approximately 8 bar is exceeded a pressure regulator is switched over and the compressor delivers, at a very low back or storage pressure into the atmosphere. Then, if the pressure, in the case of a vehicle-brake installation for example, falls below 7 bar, the regulator is switched back to normal delivery pressure. When the pressure is switched off from 8 bar to approximately 0 bar, a disagreeable explosive sound at approximately 109 decibel is provided.
Attempts have been made to attenuate this noise by a flexible hose pushed over the air-discharge orifice. However, this is only partially successful, as the noise level still remains above 100 decibel. Other known measures have also failed to produce satisfactory results or, in particular, were inadequate to reduce the noise to a tolerable level of approximately 85 decibel.
The present invention seeks, by simple inexpensive means, to reduce the noise level caused by surplus compressed air discharged from a compressor installation to such an extent that the measurable values are below 85 decibel.
In accordance with the invention, an element which reduces the jet energy of the discharged surplus compressed air is arranged on the outlet side of the overpressure-relief valve.
In this manner, the discharging compressed air is considerably expanded and the development of sound waves, particularly of high frequency, is counteracted.
According to a further feature of the invention, the element reducing the jet energy may be a capillary throttling device with a plurality of capillary ducts arranged parallel to each other. Energy is converted into heat by boundary-layer friction during flow through the several capillary ducts. As is known, loss of energy is synonymous with loss of sound intensity.
The individual capillary ducts of the throttling device may be widened at the inlet end with a funnel shape. This limits backwash of the discharging compressed air towards the relief valve, so that the operation of the latter is not impaired.
A plurality of capillary throttling devices may be arranged in series with intermediate cavities, so that the sound is also attenuated by interference.
A tubular shield may adjoin the capillary throttling device or that device which is last with respect to the direction of discharge. Such a tubular shield may extend beyond the casing of the apparatus and terminate in the atmosphere. Fouling of other parts disposed in the casing is also obviated in this manner.
An embodiment of the invention by way of example will now be more fully described with reference to the accompanying drawing, in which: Figure 1 is a longitudinal section through a silencing means comprising two capillary throttling devices disposed in series and Figure 2 an elevational view of the inlet end of the silencing means.
The silencing means illustrated, suitable for a compressor installation for a motor vehicle, comprises a tube 1 which is connected at its one end 2 to the outlet for surplus compressed air of an overpressure-relief valve (not shown) located downstream of a compressed-air tank. At least one capillary throttling device 3 is disposed in a fixed position in the bore of the tube 1. At its inlet end, the device 3 has the form of a nozzle 4 which widens abruptly, with a sharp edge, to form an expansion chamber 5. A plurality of parallel capillary ducts 6, which open into the chamber 5, each widen in funnel form towards the chamber 5 to prevent backwash of the discharging surplus air. A tubular shield 8 for or, as shown, forming part of the tube 1 may extend sufficiently for it to terminate in the atmosphere outside the casing of the apparatus.This has the advantage also that the other parts or components disposed in the casing are not fouled by the surplus air.
In the example illustrated, a second identical throttling device 3 follows the first with the interposition of an open cavity 9. More than two throttling devices could be similarly arranged or a single such device could be used.
The sound attenuation achieved by the silencing means is due, on the one hand, to boundary-layer friction during flow through the capillary ducts, whereby energy is converted into heat, and, on the other hand, to turbulance in the expansion chamber or chambers 5 and cavity or cavities 9 and the resultant effect of wave collision or interference.
1. Silencing means for a compressor installation, comprising a compressed-air vessel and an overpressure-relief valve by means of which surplus compressed air is blown off into the atmosphere, wherein an element which reduces the jet energy of the discharging surplus air is disposed on the outlet side of the said valve.
2. Silencing means according to Claim 1, wherein the said element comprises a capillary throttling device with a plurality of parallel capillary ducts.
3. Silencing means according to Claim 2, wherein the individual capillary ducts of the throttling device are widened at the inlet end with a funnel shape.
4. Silencing means according to any one of Claims 1 to 3, wherein the said element comprises a plurality of capillary throttling devices disposed in series with intervening cavities.
5. Silencing means according to any one of Claims 1 to 4, wherein a tubular shield adjoins the capillary throttling device, or the last, with respect to
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Silencing means for a compressor installation This invention relates to silencing means for a compressor installation, particularly but not exclusively for a motor vehicle, comprising a compressed - air vessel and an overpressure-relief valve by means of which surplus compressed air is blown off into the atmosphere. Compressor installations, particularly for motor vehicles, may be designed so that when the adjusted service or operating pressure of, say, approximately 8 bar is exceeded a pressure regulator is switched over and the compressor delivers, at a very low back or storage pressure into the atmosphere. Then, if the pressure, in the case of a vehicle-brake installation for example, falls below 7 bar, the regulator is switched back to normal delivery pressure. When the pressure is switched off from 8 bar to approximately 0 bar, a disagreeable explosive sound at approximately 109 decibel is provided. Attempts have been made to attenuate this noise by a flexible hose pushed over the air-discharge orifice. However, this is only partially successful, as the noise level still remains above 100 decibel. Other known measures have also failed to produce satisfactory results or, in particular, were inadequate to reduce the noise to a tolerable level of approximately 85 decibel. The present invention seeks, by simple inexpensive means, to reduce the noise level caused by surplus compressed air discharged from a compressor installation to such an extent that the measurable values are below 85 decibel. In accordance with the invention, an element which reduces the jet energy of the discharged surplus compressed air is arranged on the outlet side of the overpressure-relief valve. In this manner, the discharging compressed air is considerably expanded and the development of sound waves, particularly of high frequency, is counteracted. According to a further feature of the invention, the element reducing the jet energy may be a capillary throttling device with a plurality of capillary ducts arranged parallel to each other. Energy is converted into heat by boundary-layer friction during flow through the several capillary ducts. As is known, loss of energy is synonymous with loss of sound intensity. The individual capillary ducts of the throttling device may be widened at the inlet end with a funnel shape. This limits backwash of the discharging compressed air towards the relief valve, so that the operation of the latter is not impaired. A plurality of capillary throttling devices may be arranged in series with intermediate cavities, so that the sound is also attenuated by interference. A tubular shield may adjoin the capillary throttling device or that device which is last with respect to the direction of discharge. Such a tubular shield may extend beyond the casing of the apparatus and terminate in the atmosphere. Fouling of other parts disposed in the casing is also obviated in this manner. An embodiment of the invention by way of example will now be more fully described with reference to the accompanying drawing, in which: Figure 1 is a longitudinal section through a silencing means comprising two capillary throttling devices disposed in series and Figure 2 an elevational view of the inlet end of the silencing means. The silencing means illustrated, suitable for a compressor installation for a motor vehicle, comprises a tube 1 which is connected at its one end 2 to the outlet for surplus compressed air of an overpressure-relief valve (not shown) located downstream of a compressed-air tank. At least one capillary throttling device 3 is disposed in a fixed position in the bore of the tube 1. At its inlet end, the device 3 has the form of a nozzle 4 which widens abruptly, with a sharp edge, to form an expansion chamber 5. A plurality of parallel capillary ducts 6, which open into the chamber 5, each widen in funnel form towards the chamber 5 to prevent backwash of the discharging surplus air. A tubular shield 8 for or, as shown, forming part of the tube 1 may extend sufficiently for it to terminate in the atmosphere outside the casing of the apparatus.This has the advantage also that the other parts or components disposed in the casing are not fouled by the surplus air. In the example illustrated, a second identical throttling device 3 follows the first with the interposition of an open cavity 9. More than two throttling devices could be similarly arranged or a single such device could be used. The sound attenuation achieved by the silencing means is due, on the one hand, to boundary-layer friction during flow through the capillary ducts, whereby energy is converted into heat, and, on the other hand, to turbulance in the expansion chamber or chambers 5 and cavity or cavities 9 and the resultant effect of wave collision or interference. CLAIMS
1. Silencing means for a compressor installation, comprising a compressed-air vessel and an overpressure-relief valve by means of which surplus compressed air is blown off into the atmosphere, wherein an element which reduces the jet energy of the discharging surplus air is disposed on the outlet side of the said valve.
2. Silencing means according to Claim 1, wherein the said element comprises a capillary throttling device with a plurality of parallel capillary ducts.
3. Silencing means according to Claim 2, wherein the individual capillary ducts of the throttling device are widened at the inlet end with a funnel shape.
4. Silencing means according to any one of Claims 1 to 3, wherein the said element comprises a plurality of capillary throttling devices disposed in series with intervening cavities.
5. Silencing means according to any one of Claims 1 to 4, wherein a tubular shield adjoins the capillary throttling device, or the last, with respect to the direction of discharge, of a plurality of said devices, at the outlet end.
6. Silencing means according to Claim 5, wherein the tubular shield extends out of an enclosing casing and terminates in the atmosphere.
7. Silencing means for a compressor installation substantially as hereinbefore described with reference to the accompanying drawing.
GB8000985A 1979-01-13 1980-01-11 Silencing means for a compressor installation Withdrawn GB2039613A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19792901191 DE2901191A1 (en) 1979-01-13 1979-01-13 SOUND ABSORBER DEVICE FOR A COMPRESSOR SYSTEM, ESPECIALLY FOR MOTOR VEHICLES

Publications (1)

Publication Number Publication Date
GB2039613A true GB2039613A (en) 1980-08-13

Family

ID=6060496

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8000985A Withdrawn GB2039613A (en) 1979-01-13 1980-01-11 Silencing means for a compressor installation

Country Status (4)

Country Link
DE (1) DE2901191A1 (en)
FR (1) FR2446379A1 (en)
GB (1) GB2039613A (en)
IT (1) IT8047590A0 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2287752A (en) * 1994-03-19 1995-09-27 Ford Motor Co Gas flow silencer
US5765997A (en) * 1995-04-29 1998-06-16 Daewoo Electronics Co., Ltd. Bubble generator for a washing machine
US6935848B2 (en) 2003-05-19 2005-08-30 Bristol Compressors, Inc. Discharge muffler placement in a compressor
GB2512327A (en) * 2013-03-26 2014-10-01 Jaguar Land Rover Ltd Exhaust system
DE102017005984A1 (en) * 2017-06-23 2018-12-27 Linde Aktiengesellschaft Silencer device, pressure reduction device and tank system with a pressure reduction device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB377863A (en) * 1931-01-30 1932-08-04 Servel Inc Improvements in motor compressor units

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2287752A (en) * 1994-03-19 1995-09-27 Ford Motor Co Gas flow silencer
US5765997A (en) * 1995-04-29 1998-06-16 Daewoo Electronics Co., Ltd. Bubble generator for a washing machine
US6935848B2 (en) 2003-05-19 2005-08-30 Bristol Compressors, Inc. Discharge muffler placement in a compressor
GB2512327A (en) * 2013-03-26 2014-10-01 Jaguar Land Rover Ltd Exhaust system
DE102017005984A1 (en) * 2017-06-23 2018-12-27 Linde Aktiengesellschaft Silencer device, pressure reduction device and tank system with a pressure reduction device

Also Published As

Publication number Publication date
IT8047590A0 (en) 1980-01-14
FR2446379A1 (en) 1980-08-08
DE2901191A1 (en) 1980-07-24

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)