EP0240278B1 - Compresseur de gaz - Google Patents

Compresseur de gaz Download PDF

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Publication number
EP0240278B1
EP0240278B1 EP19870302717 EP87302717A EP0240278B1 EP 0240278 B1 EP0240278 B1 EP 0240278B1 EP 19870302717 EP19870302717 EP 19870302717 EP 87302717 A EP87302717 A EP 87302717A EP 0240278 B1 EP0240278 B1 EP 0240278B1
Authority
EP
European Patent Office
Prior art keywords
valve
pressure
chamber
compression chamber
area
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
Application number
EP19870302717
Other languages
German (de)
English (en)
Other versions
EP0240278A3 (en
EP0240278A2 (fr
Inventor
Michael Charles Christmas
William James Bentick Swinton-Clarke
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10595495&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0240278(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Bendix Ltd filed Critical Bendix Ltd
Publication of EP0240278A2 publication Critical patent/EP0240278A2/fr
Publication of EP0240278A3 publication Critical patent/EP0240278A3/en
Application granted granted Critical
Publication of EP0240278B1 publication Critical patent/EP0240278B1/fr
Expired 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/24—Bypassing

Definitions

  • This invention relates to gas compressors and relates more especially to air compressors fitted with unloader valves which when signalled operate to connect a compression chamber to atmosphere.
  • an unloader valve In air compressors of a type fitted to and driven by heavy vehicle engines for supplying compressed air to reservoirs of compressed air braking systems, it is common to fit an unloader valve to be signalled in response to a desired reservoir pressure being attained.
  • a valve can be fitted in the cylinder head of a piston and cylinder compressor and arranged to open when signalled to connect the compression chamber to the inlet chamber so as to interrupt supply of compressed air to a delivery port and the reservoirs.
  • Unloader valves of this type are described, for example, in German Offenlegungsschrift 2918482. With integral unloader valves of such a general type it has been found that undue heating has occurred within the cylinder head of the compressor during normal operation.
  • the present invention has an object to provide a gas compressor wherein such heating or energy dissipation within the cylinder head is removed or at least appreciably reduced.
  • a gas compressor comprising a reciprocating member forming a movable wall of a compression chamber for cyclicly increasing and decreasing the volume thereof to induce and deliver compressed gas to a delivery port an unloader valve integral with the head of the compressor and including a biassed valve member acting in a sense to close a vent passage communicating with said chamber, said unloader valve being operable by a fluid pressure signal acting on a pressure responsive area thereof in a sense to counteract the bias and thereby to vent said compression chamber during compression strokes of said member characterised in that said valve has a further area subject to the pressure in said compression chamber whereby said pressure acts thereon in a sense to assist the spring bias.
  • said further pressure area is at least as large as the area presented to the pressure in said chamber by the valve member in the closed position thereof.
  • FIG. 1 illustrates the upper part of a single cylinder piston-type air compressor, with the crankcase and crankshaft assembly not shown.
  • the crankshaft is pivotally connected to a piston 2 via a gudgeon pin 3 and a connecting rod, the upper end of which is indicated by reference 1.
  • the piston 2 is thereby reciprocable in a bore 4 of a cylinder 5 alternatively to increase and decrease the volume of a compression chamber 6 of which the piston 2 forms one wall.
  • the compressor is also provided with a valve plate 7 carrying a delivery reed valve 8 and an inlet reed valve 9.
  • the delivery reed valve 8 provides a one way communication from the compression chamber 6 through the valve plate to a delivery port 10 of a cylinder head 11 and the inlet valve 9 provides a one way communication between a induction or inlet chamber 12 through a passage 13 in the valve plate.
  • the cylinder head and valve plate are assembled to the cylinder by conventional bolts denoted by ref. 14.
  • the cylinder head is further provided with an unloader valve illustrated on a larger scale in Fig. 2 and comprising a valve member 15 sealingly slideable in a bore 16 to open and close a passage 17 between the compression chamber 6 and the inlet chamber 12.
  • This valve member has an annular pressure responsive area 24 subject to control pressure at a control port 27 acting in a sense to overcome the bias of a spring 18 when a desired reservoir pressure is attained. Additionally, the pressure responsive member is provided with an internal passage-way 19 which communicates with a further area 20 located to act in a sense to enhance the bias of spring 18 in the presence of pressure in the chamber 6.
  • the whole assembly of the unloader valve is held together by a vented closure member 21 located in the cylinder head by an internal circlip 22.
  • the closure member 21 being provided with a spigot 25 having an annular seal 23 upon which the valve member is sealingly slideable.
  • the unloader valve tends to close during induction strokes but to partially open on compression strokes, such opening being caused by recovering reservoir pressure enhanced by compression chamber pressure acting on the valve closure area of 17.
  • the result of this partial opening can be substantial energy dissipation and over heating.
  • the additional area 20 is at least as large as the area of the valve member covering the vent passage 17 which is subject to compression chamber pressure in the closed position thereof.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)

Claims (2)

  1. Compresseur à gaz comprenant un organe (2) mobile à va-et-vient, formant une paroi mobile d'une chambre de compression pour augmenter et réduire de façon cyclique le volume de celle-ci afin de créer et éjecter du gaz comprimé vers un passage de sortie (10), une valve de décharge faisant partie de la tête du compresseur et comprenant un organe de valve (15) poussé par ressort et agissant dans une direction de fermeture d'un passage d'évent (17) communicant avec ladite chambre, cette valve de décharge pouvant être actionnée par un signal de pression de fluide agissant sur une surface (24) de ladite valve soumise à une pression dans un sens tel qu'elle s'oppose à la force du ressort et ainsi mettre à l'atmosphère ladite chambre de compression durant les courses de compression dudit organe,
    car en ce que ladite valve présente une autre surface (20) soumise à la pression régnant dans ladite chambre de compression de telle façon que ladite pression agit sur cette surface dans le sens de l'assistance à la force du ressort.
  2. Compresseur à gaz selon la revendication 1, caractérisé en ce que ladite autre surface (20) est au moins aussi étendue que la surface que l'organe de valve présente à la pression régnant dans ladite chambre quand elle est en position de fermeture.
EP19870302717 1986-04-01 1987-03-30 Compresseur de gaz Expired EP0240278B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB08607955A GB2188682A (en) 1986-04-01 1986-04-01 Unloader valve for compressor
GB8607955 1986-04-01

Publications (3)

Publication Number Publication Date
EP0240278A2 EP0240278A2 (fr) 1987-10-07
EP0240278A3 EP0240278A3 (en) 1989-08-30
EP0240278B1 true EP0240278B1 (fr) 1991-10-16

Family

ID=10595495

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870302717 Expired EP0240278B1 (fr) 1986-04-01 1987-03-30 Compresseur de gaz

Country Status (4)

Country Link
EP (1) EP0240278B1 (fr)
DE (1) DE3773723D1 (fr)
ES (1) ES2026529T3 (fr)
GB (1) GB2188682A (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1259589B (it) * 1992-06-22 1996-03-20 Bendix Heavy Vehicle Syst Compressore volumetrico alternativo a stantuffo, particolarmente per impianti pneumatici di frenatura.
GB2319569A (en) * 1996-11-22 1998-05-27 Knorr Bremse Systeme Unloading gas compressors
US9657733B2 (en) * 2013-12-16 2017-05-23 Wabco Compressor Manufacturing Co. Compressor for a vehicle air supply system
US20160298763A1 (en) 2015-04-09 2016-10-13 Bendix Commercial Vehicle Systems Llc Piston assembly for an unloader valve of an air compressor
EP3718844B1 (fr) * 2019-04-05 2023-02-08 KNORR-BREMSE Systeme für Nutzfahrzeuge GmbH Ensemble de piston pour soupape de décharge d'un compresseur d'air

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1352457A (fr) * 1963-03-29 1964-02-14 Normalair Ltd Dispositif de marche à vide pour compresseur
DE1940736A1 (de) * 1969-08-09 1971-02-18 Condor Werk Frede Kg Geb Steuereinrichtung fuer Kompressoranlagen
CH566505A5 (fr) * 1974-04-09 1975-09-15 Von Roll Ag
DE3042069A1 (de) * 1980-11-07 1982-06-16 Knorr-Bremse GmbH, 8000 München Ventilvorrichtung fuer eine pneumatisch gesteuerte kompressor-abschaltkupplung

Also Published As

Publication number Publication date
EP0240278A3 (en) 1989-08-30
GB8607955D0 (en) 1986-05-08
DE3773723D1 (de) 1991-11-21
GB2188682A (en) 1987-10-07
GB2188682B (fr) 1989-11-15
ES2026529T3 (es) 1992-05-01
EP0240278A2 (fr) 1987-10-07

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