EP0293213B1 - Appareillage à compresseur - Google Patents

Appareillage à compresseur Download PDF

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Publication number
EP0293213B1
EP0293213B1 EP88304809A EP88304809A EP0293213B1 EP 0293213 B1 EP0293213 B1 EP 0293213B1 EP 88304809 A EP88304809 A EP 88304809A EP 88304809 A EP88304809 A EP 88304809A EP 0293213 B1 EP0293213 B1 EP 0293213B1
Authority
EP
European Patent Office
Prior art keywords
valve
compression chamber
compressor
volume
gas compressor
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 - Lifetime
Application number
EP88304809A
Other languages
German (de)
English (en)
Other versions
EP0293213A2 (fr
EP0293213A3 (en
Inventor
Jeremy James Durrant
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.)
Honeywell UK Ltd
Original Assignee
Bendix Ltd
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 Bendix Ltd filed Critical Bendix Ltd
Publication of EP0293213A2 publication Critical patent/EP0293213A2/fr
Publication of EP0293213A3 publication Critical patent/EP0293213A3/en
Application granted granted Critical
Publication of EP0293213B1 publication Critical patent/EP0293213B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

Definitions

  • This invention relates to gas compressor apparatus and relates especially but not exclusively to reciprocating piston compressors which are required to be driven by a prime mover through a gear train.
  • a compressor driven from the engine via a train of gears.
  • the compressor may either be provided with means such as an unloader valve operated by a governor for unloading it when the reservoirs are fully charged to a preset pressure or the compressor may be disengaged from the engine by means of a clutch.
  • an unloader valve operated by a governor for unloading it when the reservoirs are fully charged to a preset pressure or the compressor may be disengaged from the engine by means of a clutch.
  • a gas compressor apparatus including a housing having bearing means carrying a crankshaft and a reciprocating compressor member cyclically operable by the crankshaft to increase and decrease the volume of a compression chamber to induce gas via an inlet valve and to drive it under compression through an outlet valve and characterised by a pressure relief valve operable by means of an eccentric cam of the crankshaft to open a venting passage to vent the compression chamber in the proximity of a point of minimum volume thereof.
  • venting passage connects the compression chamber to the crankcase of the compressor.
  • the compressor may have unloading means for unloading the compressor by connecting an additional volume to the compression chamber and includes inhibiting means to prevent the operation of the relief valve whilst the compressor is unloaded.
  • said relief means vents the compression chamber in the proximity of a point of minimum volume thereof into a closed volume at or near a point of minimum volume of the compression chamber, and means for unloading the compressor operates by connecting the compression chamber to said closed volume.
  • the compressor has a crankcase and cylinder casting denoted by reference 1, provided with a mounting flange 2 for mounting the compressor on to the crankcase of an engine of a heavy vehicle.
  • the compressor is, therefore, intended to be driven through a train of gears (not shown) connecting the engine to the driven end 3 of the crankshaft of the compressor.
  • the crankshaft runs in main bearings 4 and 5 and has a crankpin 6 connected by a connecting rod 7 and a gudgeon pin 8 to a piston 9, which is thereby able to reciprocate in a bore 10 of the compressor cylinder.
  • the cylinder is provided with a valve plate 11 and a cylinder head 12, details of which are not shown but it should be appreciated that the valve plate 11 comprises reed-valves for intake and delivery via respective input and output ports in the head 12.
  • an eccentric machined cam surface 14 against which a lower end 15 of a rod-like valve member 16 is urged by a spring 17.
  • the rod-like valve member 16 is provided with an annular seal 18 retained in the crankcase casting by a washer 19 held in position by spring 17.
  • the rod 16 is thereby sealingly slideable in a bore 20, drilled alongside the cylinder bore 10 and the upper end 21 provides for opening and closing of a venting passage 22 from the compression chamber 10a of the compressor cylinder.
  • the passage 22 communicates with the crankcase volume via a valve assembly 23 bolted to the side of the compressor cylinder.
  • the valve assembly 23 has a passage 24 which registers with the passage 22 and communicates via a closure element 25 and a passage 27 with a chamber 26 connected to the crankcase volume via a drilling in the housing as denoted by reference 27a and shown dotted.
  • the closure member 25 has two seals 28 and 29, one each side of 24 and provides a seat 30 for a small check valve member 31 urged into engagement therewith by a light spring 32 resting against a piston 33 with an upward extending stem 33a.
  • the underside of the piston 33 is connected to a control port 34 such that when sufficient pressure is applied to port 34, the piston stem 33a moves upwards against 31 to maintain the check valve closed against its seat 30 for reasons to be described below.
  • the crankshaft 3 is driven through the drive means comprising a train of gears and operates in the normal way to supply compressed air via check valves or protection valves to reservoirs of a vehicle braking system.
  • the eccentric cam surface 14 is such that is operates to allow the rod 16 to move downwards under the influence of spring 17 to uncover the vent passage 22 at or near the point of minumum volume for the compression chamber 10a above piston 9.
  • the otherwise trapped high pressure in the compression chamber is thereby vented via passage 22, closure member 31 of check valve 33, chamber 26 and passages 27 and 27a into the crankcase volume of the compressor.
  • the compressor may be provided with an unloader valve which interconnects the inlet and outlet chambers to interrupt the operation of the compressor when the reservoirs are fully charged. In these conditions, the crankshaft continues to rotate off-load absorbing relatively little power from the engine.
  • An alternative method for unloading the compressor is to provide an unloader valve in the cylinder head of the compressor which conects the compression chamber to an additional clearance volume. Such an arrangement is described for example in the Specification of European Patent Application No. 0254524 In that case, a variable volume of air is enclosed within the combined compression chamber and an additional clearance volume also provided in the cylinder head.
  • the piston 33 is signalled by an unloader signal pressure at port 34 from the governor at the same time as the unloader valve is signalled to connect the compression chamber to the additional clearance volume. The effect of this is to maintain the check valve member 31 closed against seat 30 as described above so that continuing actuation of the rod 16 during the unloaded condition 1 of the compressor has no effect.
  • valve means which vents the compression chamber of the compressor into the crankcase volume at or near the point of minimum volume.
  • a compressor in which unloading is accomplished by means of an unload valve for connecting an additional clearance volume torque reversal may be reduced by means of a small valve such as 16 but which connects the compression chamber not to the crank case but to the additional clearance volume at or near the point of minimum volume.
  • a small valve such as 16 but which connects the compression chamber not to the crank case but to the additional clearance volume at or near the point of minimum volume.
  • An advantage of this arrangement is that it is not now necessary to provide a valve such as provided by seat 30 and valve member 31.
  • energy inparted by the compressor piston to air in the extra volume is in part returned to the system during each induction stroke. The effect is therefore to reduce the magnitude and widen the reverse torque characteristic of the compressor.
  • torque reversal may be reduced by arranging the unload valve to be operated on every cycle at or near the point of minimum volume of the compression chamber. This maybe readily achieved by means of a suitable overhead valve rocker arrangement operated by a push rod activated by the eccentric cam surface 14.
  • the unload valve thereby also operates as the pressure relief valve, in accordance with the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Claims (7)

  1. Appareil compresseur de gaz comprenant un carter muni de moyens de palier supportant un vilebrequin (3) et un organe compresseur (9) mobile en va-et-vient cycliquement actionné par le vilebrequin pour faire croître et décroître le volume d'une chambre de compression (10a) de manière à y injecter du gaz à travers une soupape d'entrée et à le pousser par compression à travers une soupape de sortie, caractérisé par une soupape de réduction de pression (21, 22) actionnable au moyen d'une came excentrique (14,15) du vilebrequin pour ouvrir un passage d'évent (22) de manière à aérer la chambre de compression (10a) quand celle-ci est voisine de son volume minimal.
  2. Appareil compresseur de gaz conforme à la revendication 1, caractérisé en ce que ladite soupape de réduction de pression comprend un organe de soupape en forme de tige, coulissant dans un alésage du carter pour couvrir ou découvrir le passage d'évent (22) communiquant avec la chambre de compression.
  3. Appareil compresseur de gaz conforme à la revendication 1 ou 2, caractérisé par une soupape supplémentaire (23) actionnée par un signal de déchargement du compresseur pour empêcher une aération par le passage d'évent (22).
  4. Appareil compresseur de gaz conforme à la revendication 3, caractérisé an ce que ladite soupape supplémentaire (23) est actionnée par une pression de fluide commandée par un signal de déchargement à un orifice de commande (34).
  5. Appareil compresseur de gaz conforme à la revendication 1,2,3 ou 4, caractérisé en ce que ledit passage d'évent est disposé entre la chambre de compression et un volume de boîtier de vilebrequin.
  6. Appareil compresseur de gaz conforme à la revendication 1 ou 2, caractérisé en ce que l'appareil comprend un moyen pour décharger le compresseur par raccordement de la chambre de compression à un volume fermé additionnel et en ce que ledit passage d'évent de la soupape de réduction de pression (21,22) raccorde ladite chambre de compression audit volume additionnel.
  7. Appareil compresseur de gaz conforme à la revendication 1, caractérisé en ce que ladite soupape de réduction de pression comprend un moyen de soupape qui est aussi actionné par un signal de déchargement de compresseur pour raccorder ladite chambre de compression à un volume additionnel.
EP88304809A 1987-05-28 1988-05-27 Appareillage à compresseur Expired - Lifetime EP0293213B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB878712538A GB8712538D0 (en) 1987-05-28 1987-05-28 Gas compressor apparatus
GB8712538 1987-05-28

Publications (3)

Publication Number Publication Date
EP0293213A2 EP0293213A2 (fr) 1988-11-30
EP0293213A3 EP0293213A3 (en) 1989-12-06
EP0293213B1 true EP0293213B1 (fr) 1992-10-28

Family

ID=10618032

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88304809A Expired - Lifetime EP0293213B1 (fr) 1987-05-28 1988-05-27 Appareillage à compresseur

Country Status (4)

Country Link
EP (1) EP0293213B1 (fr)
DE (1) DE3875523T2 (fr)
ES (1) ES2035921T3 (fr)
GB (2) GB8712538D0 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2356681A (en) 1999-11-29 2001-05-30 Knorr Bremse Systeme Anti-backlash, noise reducing gear wheel
CN106762539A (zh) * 2015-11-19 2017-05-31 张家港合升进出口有限公司 风冷单缸式空气压缩机
DE102016201208B4 (de) * 2016-01-27 2024-01-11 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Kolbenkompressor mit Entlüftungseinrichtung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0254524A2 (fr) * 1986-07-25 1988-01-27 Bendix Limited Réglage pour compresseur de gaz

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR963663A (fr) * 1950-07-18
DE138907C (fr) *
FR433191A (fr) * 1911-08-11 1911-12-27 Armand Rueff Perfectionnements apportés aux moteurs utilisant comme fluide moteur des fluides élastiques, plus particulièrement applicables à ceux de petite puissance, notamment ceux destinés à l'actionnement de petits outils domestiques, médicaux ou autres
GB455102A (en) * 1935-05-29 1936-10-14 Matthew White Ridley Improvements relating to compressors for air or other gases
GB2158888B (en) * 1984-05-19 1989-06-01 Bendix Ltd Improvements relating to gas compressor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0254524A2 (fr) * 1986-07-25 1988-01-27 Bendix Limited Réglage pour compresseur de gaz

Also Published As

Publication number Publication date
GB2205904B (en) 1991-06-19
ES2035921T3 (es) 1993-05-01
GB8812624D0 (en) 1988-06-29
EP0293213A2 (fr) 1988-11-30
GB8712538D0 (en) 1987-07-01
GB2205904A (en) 1988-12-21
DE3875523T2 (de) 1993-06-03
EP0293213A3 (en) 1989-12-06
DE3875523D1 (de) 1992-12-03

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