GB2184816A - Non-return valve - Google Patents

Non-return valve Download PDF

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Publication number
GB2184816A
GB2184816A GB08629419A GB8629419A GB2184816A GB 2184816 A GB2184816 A GB 2184816A GB 08629419 A GB08629419 A GB 08629419A GB 8629419 A GB8629419 A GB 8629419A GB 2184816 A GB2184816 A GB 2184816A
Authority
GB
United Kingdom
Prior art keywords
valve
air
passage
flow
compression spring
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Withdrawn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
GB08629419A
Other versions
GB8629419D0 (en
Inventor
Helmut Rossel
Franz-Josef Werhahn
Albert Friesen
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.)
Pierburg GmbH
Original Assignee
Pierburg GmbH
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 Pierburg GmbH filed Critical Pierburg GmbH
Publication of GB8629419D0 publication Critical patent/GB8629419D0/en
Publication of GB2184816A publication Critical patent/GB2184816A/en
Withdrawn legal-status Critical Current

Links

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
    • B60T17/02—Arrangements of pumps or compressors, or control devices therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
    • F04C18/344—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C18/3441—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps
    • F04C29/126—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type
    • 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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/025—Check valves with guided rigid valve members the valve being loaded by a spring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2220/00—Application
    • F04C2220/10—Vacuum

Abstract

A non-return valve, interposed between a vacuum tank, particularly of the kind used for the braking system in motor vehicles, and a vacuum pump, comprises a valve seat 8, a valve head 10 urged towards the seat by a compression spring 11. The valve head is dimensioned and constructed, relative to the passage in which it is installed, in such a way that when the air-stream flowing through the valve passage exceeds a certain speed of flow the valve head is carried along, against the influence of the compression spring, until it obturates an aperture 13, leaving open for the passage of air only at least one further aperture 14, thereby throttling the flow of air discharged into the engine crankcase and ensures good starting of the engine. <IMAGE>

Description

SPECIFICATION Non-return valve The invention relates to a non-return valve interposed between a vacuum tank, particularly of a kind used for the braking systems in motor vehicles, and a vacuum pump, the valve comprising a valve seat, a valve head and a compression spring.
A non-return valve of this general kind is known, for example, from the British Patent Specification 912 119 and serves for preventing back-flow of air from the suction chamber of the pump into the vacuum tank, carrying lubricant with it.
For harmless disposal, the oil-laden air from the vacuum pump is often discharged into the crankcase of the engine, which is usually vented into the air-intake system of the engine. This has the disadvantage that when the vacuum pump is discharging a large stream of air, for example when the engine is being started up or when the braking system is being heavily used, the large stream of air discharged into the crankcase and vented into the air-intake system can precipitate oil there, causing excessive burning of oil in the cylinders, or the engine becomes difficult to start.
The intention in the present invention is to obviate this difficulty. The problem is solved by the characteristic described in the claim.
Accordingly, this invention provides a nonreturn valve interposed between a vacuum reservoir, particularly of the kind used for the braking systems in motor vehicles, and a vacuum pump, the valve comprising a valve seat, and a valve head urged towards the seat by a compression spring, and wherein the valve head is dimensioned and constructed, relative to the passage in which it is installed, in such a way that when the air-stream flowing through the valve passage exceeds a certain speed of flow the valve head is carried along, against the influence of the compression spring until it obturates an aperture, leaving open for the passage of air only at least one further aperture, thereby throttling the flow of air aspirated by the vacuum pump.
One example of the invention shown will now be described with reference to the accompanying drawing.
The drawing shows a vacuum pump 1 with its cover removed, the suction chamber of the pump being shown at 2.
The pump 1 extracts air through a connection 3 from a vacuum reservoir, shown diagrammatically at R in the drawing, which can, for example, serve the vacuum-operated vehicle braking system shown diagrammatically at S. The air extracted from the vacuum reservoir R passes inwards towards the pump 1 through an inlet passage 6 in the connection 3, through a valve passage 5 of greater diameter and through a pump-inlet port 4 into the suction chamber 2 of the pump. Between the inlet passage 6 and the valve passage 5 of greater diameter, there is a shoulder 7.
The shoulder 7 forms a valve seat 8 for a valve head 10 which is thrust into contact with its seat 8 by a compression spring 11, which takes support against a valve plate 12, which has a central aperture 13 and, in addition, one or more auxiliary side-apertures 14.
The valve-head 10 is so dimensioned and constructed, relative to the valve passage 5, that when a moderate stream of air is being extracted from the vacuum reservoir R the valve-head 10 is lifted only a little way off its seat 8 but with increasing flow of air the valve-head 10 is carried along, against the influence of the compression spring 11, until it comes into contact with the valve plate 12, obturating the central aperture 13 of the valve plate 12, but with the side aperture 14, or apertures, remaining open.
This reduces the rate of flow of extracted air into the crankcase of the engine but without impairing the action of the non-return valve 9 in preventing the pressure in the pumping chamber 2 from striking back into the vacuum reservoir R, carrying lubricating oil with it.
Thus the sring loaded valve device is so constructed and arranged that when the airstream flowing through the valve passage exceeds a certain rate or speed of flow the valve head 10 is carried along, against the influence of the compression spring 11, until it obturates the main aperture 13, leaving open for the passage of air only the (at least one) further aperture 14, thereby throttling the flow of air discharged into the engine crankcase.
Inter alia this helps to ensure good starting of the engine.
CLAIM
1. A non-return valve interposed between a vacuum reservoir, particularly of the kind used for the braking systems in motor vehicles, and a vacuum pump, the valve comprising a valve seat, and a valve head urged towards the seat by a compression spring, and wherein the valve head (10) is dimensioned and constructed, relative to the passage (5) in which it is installed, in such a way that when the air-stream flowing through the valve passage (5) exceeds a certain speed of flow the valve head (10) is carried along, against the influence of the compression spring (11) until it obturates an aperture (13), leaving open for the passage of air only at least one further aperture (14), thereby throttling the flow of air aspirated by the vacuum pump.
2. A non-return valve substantially as described with reference to the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (2)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Non-return valve The invention relates to a non-return valve interposed between a vacuum tank, particularly of a kind used for the braking systems in motor vehicles, and a vacuum pump, the valve comprising a valve seat, a valve head and a compression spring. A non-return valve of this general kind is known, for example, from the British Patent Specification 912 119 and serves for preventing back-flow of air from the suction chamber of the pump into the vacuum tank, carrying lubricant with it. For harmless disposal, the oil-laden air from the vacuum pump is often discharged into the crankcase of the engine, which is usually vented into the air-intake system of the engine. This has the disadvantage that when the vacuum pump is discharging a large stream of air, for example when the engine is being started up or when the braking system is being heavily used, the large stream of air discharged into the crankcase and vented into the air-intake system can precipitate oil there, causing excessive burning of oil in the cylinders, or the engine becomes difficult to start. The intention in the present invention is to obviate this difficulty. The problem is solved by the characteristic described in the claim. Accordingly, this invention provides a nonreturn valve interposed between a vacuum reservoir, particularly of the kind used for the braking systems in motor vehicles, and a vacuum pump, the valve comprising a valve seat, and a valve head urged towards the seat by a compression spring, and wherein the valve head is dimensioned and constructed, relative to the passage in which it is installed, in such a way that when the air-stream flowing through the valve passage exceeds a certain speed of flow the valve head is carried along, against the influence of the compression spring until it obturates an aperture, leaving open for the passage of air only at least one further aperture, thereby throttling the flow of air aspirated by the vacuum pump. One example of the invention shown will now be described with reference to the accompanying drawing. The drawing shows a vacuum pump 1 with its cover removed, the suction chamber of the pump being shown at 2. The pump 1 extracts air through a connection 3 from a vacuum reservoir, shown diagrammatically at R in the drawing, which can, for example, serve the vacuum-operated vehicle braking system shown diagrammatically at S. The air extracted from the vacuum reservoir R passes inwards towards the pump 1 through an inlet passage 6 in the connection 3, through a valve passage 5 of greater diameter and through a pump-inlet port 4 into the suction chamber 2 of the pump. Between the inlet passage 6 and the valve passage 5 of greater diameter, there is a shoulder 7. The shoulder 7 forms a valve seat 8 for a valve head 10 which is thrust into contact with its seat 8 by a compression spring 11, which takes support against a valve plate 12, which has a central aperture 13 and, in addition, one or more auxiliary side-apertures 14. The valve-head 10 is so dimensioned and constructed, relative to the valve passage 5, that when a moderate stream of air is being extracted from the vacuum reservoir R the valve-head 10 is lifted only a little way off its seat 8 but with increasing flow of air the valve-head 10 is carried along, against the influence of the compression spring 11, until it comes into contact with the valve plate 12, obturating the central aperture 13 of the valve plate 12, but with the side aperture 14, or apertures, remaining open. This reduces the rate of flow of extracted air into the crankcase of the engine but without impairing the action of the non-return valve 9 in preventing the pressure in the pumping chamber 2 from striking back into the vacuum reservoir R, carrying lubricating oil with it. Thus the sring loaded valve device is so constructed and arranged that when the airstream flowing through the valve passage exceeds a certain rate or speed of flow the valve head 10 is carried along, against the influence of the compression spring 11, until it obturates the main aperture 13, leaving open for the passage of air only the (at least one) further aperture 14, thereby throttling the flow of air discharged into the engine crankcase. Inter alia this helps to ensure good starting of the engine. CLAIM
1. A non-return valve interposed between a vacuum reservoir, particularly of the kind used for the braking systems in motor vehicles, and a vacuum pump, the valve comprising a valve seat, and a valve head urged towards the seat by a compression spring, and wherein the valve head (10) is dimensioned and constructed, relative to the passage (5) in which it is installed, in such a way that when the air-stream flowing through the valve passage (5) exceeds a certain speed of flow the valve head (10) is carried along, against the influence of the compression spring (11) until it obturates an aperture (13), leaving open for the passage of air only at least one further aperture (14), thereby throttling the flow of air aspirated by the vacuum pump.
2. A non-return valve substantially as described with reference to the accompanying drawing.
GB08629419A 1985-12-21 1986-12-09 Non-return valve Withdrawn GB2184816A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19853545666 DE3545666A1 (en) 1985-12-21 1985-12-21 CHECK VALVE

Publications (2)

Publication Number Publication Date
GB8629419D0 GB8629419D0 (en) 1987-01-21
GB2184816A true GB2184816A (en) 1987-07-01

Family

ID=6289306

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08629419A Withdrawn GB2184816A (en) 1985-12-21 1986-12-09 Non-return valve

Country Status (4)

Country Link
DE (1) DE3545666A1 (en)
FR (1) FR2592128A1 (en)
GB (1) GB2184816A (en)
IT (1) IT1198490B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020104034A1 (en) * 2018-11-22 2020-05-28 Pierburg Pump Technology Gmbh Check valve arrangement and motor vehicle vacuum pump

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3831554C2 (en) * 1988-09-16 1997-06-05 Rexroth Pneumatik Mannesmann Throttle check valve
FR2990474B1 (en) * 2012-05-10 2014-05-02 Aircelle Sa THRUST INVERTER WITH BLOCK CONTROLLED DEPLOYMENT

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2085122A (en) * 1980-10-07 1982-04-21 Nissan Motor Check valve used with vacuum system for a vehicle
GB2105822A (en) * 1981-07-24 1983-03-30 Messengers Filler valve for a fluid tank

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB912119A (en) * 1960-05-18 1962-12-05 Dewandre Co Ltd C Improvements in or relating to rotary exhausters and the like
CS161529B1 (en) * 1973-07-06 1975-06-10

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2085122A (en) * 1980-10-07 1982-04-21 Nissan Motor Check valve used with vacuum system for a vehicle
GB2105822A (en) * 1981-07-24 1983-03-30 Messengers Filler valve for a fluid tank

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020104034A1 (en) * 2018-11-22 2020-05-28 Pierburg Pump Technology Gmbh Check valve arrangement and motor vehicle vacuum pump

Also Published As

Publication number Publication date
GB8629419D0 (en) 1987-01-21
DE3545666A1 (en) 1987-07-02
IT8648705A0 (en) 1986-12-04
FR2592128A1 (en) 1987-06-26
DE3545666C2 (en) 1989-03-30
IT1198490B (en) 1988-12-21

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)