EP0519880A1 - Einlass-Absperrventil für Drehkolbenvakuumpumpen - Google Patents
Einlass-Absperrventil für Drehkolbenvakuumpumpen Download PDFInfo
- Publication number
- EP0519880A1 EP0519880A1 EP92830312A EP92830312A EP0519880A1 EP 0519880 A1 EP0519880 A1 EP 0519880A1 EP 92830312 A EP92830312 A EP 92830312A EP 92830312 A EP92830312 A EP 92830312A EP 0519880 A1 EP0519880 A1 EP 0519880A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- shut
- pump
- hydraulic circuit
- shaft
- 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- Withdrawn
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Classifications
-
- 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
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/24—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
-
- 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
Definitions
- the invention relates to a novel shut-off system for the isolation of the vacuum environment from the vacuum pump when the pump is stopped and during its stoppage.
- the principal object of the invention is to avoid the use of a fluid - such as air or other gas, or oil or other liquid - to control said shut-off system, with a number of advantages which will become obvious from a reading of the following text which lists the principal advantages.
- the rotary vacuum pump is of the type with a hydraulic circuit and associated pumping mechanism for lubrication and for auxiliary controls and with a shut-off valve for isolation between the vacuum environment and the vacuum pump when the pump is stopped and as a result of the consequent pressure drop in said hydraulic circuit.
- the pump comprisesfor the closing of said shut-off valve - a mechanical transmission acted on by an elastic means to move the shut-off valve to the closed position and an actuator operated by the pressure of the hydraulic circuit to cause the shut-off valve to move to the open position.
- the mechanical transmission may comprise oscillating mechanisms with rocker arms or equivalent, but preferably it comprises a rotating shaft which passes through a wall separating the vacuum environment of the pump from the exterior, this shaft being combined with means of sealing in the form of a ring or similar.
- Means of delaying the enabling of the movement of the shut-off valve to the open position, with respect to the starting of the pumping mechanism of the hydraulic circuit, are advantageously provided to ensure that a vacuum is produced within the pump before communication with the vacuum environment is re-established.
- 1 indicates the body of the pump as a whole, of which 3 indicates the rotor which is eccentric with respect to the cavity in which it operates; the body of the pump is immersed in the oil contained in the casing.
- the upper part of the casing and the free surface of the oil form a space indicated as a whole, by 5, where the discharge of the pump valves and of the various apertures of the hydraulic circuit takes place.
- the hydraulic circuit comprises its own pumping mechanism associated with the rotor of the pump.
- the environment 5 is at atmospheric pressure or in any case at a pressure greater than that of the cavity in which the vacuum pump causes a depressurization to limits which may in comparison be very extreme.
- 7 indicates the flange for suction and for coupling to the vacuum environment A with which the pump is associated.
- the shut-off valve 15 must be rapidly moved to the closed position against the seat 7A as soon as the vacuum pump has ceased to operate, in order to avoid a reduction of the vacuum in the environment connected to the coupling 7; the shut-off valve 15 must be capable of opening from the closed position against the seat 7A only when, as the operation of the pump is restarted, a sufficient level of vacuum has been recreated in the environment 9 to prevent disturbances in the level of vacuum of the environment to which the coupling 7 is connected; in practice, the shut-off valve 15 may be opened by gravity with the sliding of the guide rod 13 in the housing 11.
- a control system is provided for the shut-off valve 15, in particular for its closing against the seat 7A, which does not make use of a control fluid which can cause the release of gas into the vacuum environment where this fluid might enter in the shut-off valve control operation; this occurs in a certain number of known solutions, which make use of control by air or other gas or by a liquid such as the oil used for the hydraulic lubrication circuit.
- the closing is caused by a mechanical transmission which comprises a shaft 17 passing through a wall 1X of the pump, which separates the vacuum environment 9 from the environment 5 at atmospheric or equivalent pressure.
- the shaft 17 is accommodated in a component 19 which forms an extended journal bearing for the shaft 17 and also forms a housing for means of sealing - which may be multiple - to provide a seal around the shaft 17 which can rotate, in order to prevent a penetration of gas into the interior of the pump, in other words from the compartment 5 into the compartment 9;
- these sealing means may advantageously consist, for example, of a pair of ring seals known as O-rings, indicated generally by 21 and disposed in an environment which may for example contain grease or other equivalent sealing substance.
- the shaft 17 has a head 23 secured to it by a key or other system; said head has a radial arm 25 which extends into a longitudinal housing 13A in the rod 13; this housing is extended substantially in the form of a slot and may also be open at the lower end, in other words extended to the lower end of the rod 13; in all cases, the end of the arm 25 is capable of acting on the end of the longitudinal slot-shaped housing 13A.
- the shaft 17 extends into the compartment 5 and in this compartment has an elbow 17A and an extension 17B parallel to the shaft 17.
- this circuit includes ducts such as the duct 29, which communicates with a cylinder 31 formed in the body 1 under the extension 17B of the shaft 17.
- a piston 33 which forms, with the cylinder 31, the said actuator 27 which is capable of acting on the extension 17B of the shaft 17 when the hydraulic circuit - of which the duct 29 and the cylinder 31 form part - is pressurized by the activation of the pump, in other words of the rotor 3 and the pumping mechanism of the hydraulic circuit.
- a valve with a ball 35 capable of blocking an aperture which opens to the environment 5 in a generally upward direction, is formed within the piston 33.
- the shaft 17 is surrounded by a coil spring 37 which acts between the elbow 17A and a fixed support in such a way as to impart an angular force to the shaft 17 in the direction of the arrow fC which corresponds to the upward displacement of the arm 25, which causes a closing force to be applied to the shut-off valve 15, which is pushed elastically by the arm 25 via the cylindrical rod 13 against the seat 7A.
- the actuator 27 in turn is capable, under the internal pressure of the hydraulic circuit, of lifting the extension 17B causing the rotation of the shaft 17 in the opposite direction to fC and consequently the lowering of the arm 25, consequently also causing a lowering of the shut-off valve 15, a lowering which may be obtained as a result of the valve's own weight.
- shut-off valve 15 is no longer pushed against the seat 7A by the elastic action of the spring 37 through the mechanical transmission which comprises the shaft 17 and the arm 25, and the shut-off valve 15 tends to be lowered under its own weight and that of its guide rod 13. Owing to the limited delay, this takes place as soon as the vacuum pump - which has started to rotate - has created a sufficiently high level of vacuum in the environment 9, in practice very close to the level of vacuum which can be achieved in the environment connected to the coupling 7, as a result of which the opening of the shut-off valve takes place without disturbance in the level of vacuum maintained in the environment A connected to the coupling 7. It is thus possible to start and stop the pump without the occurrence of appreciable fluctuations in the level of vacuum in the vacuum environment A previously created by the pump.
- the described closing system offers the following advantages, among others:
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITFI910143A IT1246969B (it) | 1991-06-17 | 1991-06-17 | Pompa rotativa per vuoto, con otturatore a comando automatico per l'isolamento dell'ambiente sotto-vuoto. |
ITFI910143 | 1991-06-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0519880A1 true EP0519880A1 (de) | 1992-12-23 |
Family
ID=11349690
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92830312A Withdrawn EP0519880A1 (de) | 1991-06-17 | 1992-06-17 | Einlass-Absperrventil für Drehkolbenvakuumpumpen |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0519880A1 (de) |
JP (1) | JPH0681787A (de) |
KR (1) | KR930000838A (de) |
IT (1) | IT1246969B (de) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB455003A (en) * | 1935-05-07 | 1936-10-12 | British Thomson Houston Co Ltd | Improvements in and relating to vacuum pumps |
GB1195361A (en) * | 1966-03-28 | 1970-06-17 | N G N Ltd | Improvements in and relating to Vacuum Pumping apparatus including a Rotary Vacuum Pump |
EP0163228A2 (de) * | 1984-05-21 | 1985-12-04 | General Signal Corporation | Einlass-Absperrventil für Drehkolbenpumpen |
EP0277924A2 (de) * | 1987-02-04 | 1988-08-10 | GALILEO VACUUM TEC S.p.A. | Schmierölkreislauf von Drehkolbenvakuumpumpen |
-
1991
- 1991-06-17 IT ITFI910143A patent/IT1246969B/it active IP Right Grant
-
1992
- 1992-06-08 JP JP4147411A patent/JPH0681787A/ja active Pending
- 1992-06-15 KR KR1019920010317A patent/KR930000838A/ko not_active Application Discontinuation
- 1992-06-17 EP EP92830312A patent/EP0519880A1/de not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB455003A (en) * | 1935-05-07 | 1936-10-12 | British Thomson Houston Co Ltd | Improvements in and relating to vacuum pumps |
GB1195361A (en) * | 1966-03-28 | 1970-06-17 | N G N Ltd | Improvements in and relating to Vacuum Pumping apparatus including a Rotary Vacuum Pump |
EP0163228A2 (de) * | 1984-05-21 | 1985-12-04 | General Signal Corporation | Einlass-Absperrventil für Drehkolbenpumpen |
EP0277924A2 (de) * | 1987-02-04 | 1988-08-10 | GALILEO VACUUM TEC S.p.A. | Schmierölkreislauf von Drehkolbenvakuumpumpen |
Also Published As
Publication number | Publication date |
---|---|
ITFI910143A0 (it) | 1991-06-17 |
KR930000838A (ko) | 1993-01-15 |
JPH0681787A (ja) | 1994-03-22 |
IT1246969B (it) | 1994-12-01 |
ITFI910143A1 (it) | 1992-12-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE ES FR GB |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19930624 |