WO2020225145A1 - Pompe avec soupape d'échappement - Google Patents

Pompe avec soupape d'échappement Download PDF

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Publication number
WO2020225145A1
WO2020225145A1 PCT/EP2020/062189 EP2020062189W WO2020225145A1 WO 2020225145 A1 WO2020225145 A1 WO 2020225145A1 EP 2020062189 W EP2020062189 W EP 2020062189W WO 2020225145 A1 WO2020225145 A1 WO 2020225145A1
Authority
WO
WIPO (PCT)
Prior art keywords
exhaust valve
pressure
pump
gas
valve
Prior art date
Application number
PCT/EP2020/062189
Other languages
English (en)
Inventor
Jean-Francois Aubert
Original Assignee
Leybold France Sas
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 Leybold France Sas filed Critical Leybold France Sas
Publication of WO2020225145A1 publication Critical patent/WO2020225145A1/fr

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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
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/123—Fluid connections
    • 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
    • F04B39/08—Actuation of distribution members
    • 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
    • F04B39/10—Adaptations or arrangements of distribution members
    • F04B39/1073—Adaptations or arrangements of distribution members the members being reed 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
    • 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
    • F04C18/3442—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 the surfaces of the inner and outer member, forming the inlet and outlet opening
    • 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
    • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
    • F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
    • 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
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/811—Actuator for control, e.g. pneumatic, hydraulic, electric
    • 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
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/58—Valve parameters
    • F04C2270/585—Controlled or regulated

Definitions

  • the field of the invention relates to pumps and in particular to exhaust valves for such pumps.
  • Pumps are used for conveying fluids from an inlet to an outlet. Pumps may act to change the pressure of the gas being pumped. Exhaust valves may be used at the outlet of a pump to impede backflow of any fluids being pumped. Although exhaust valves help to prevent internal leakage, they also act to impede flow and can increase the power requirements of the pump.
  • an exhaust valve will depend on the application of the pump.
  • a vacuum pump for example, will achieve a higher ultimate vacuum with a stiffer exhaust valve, however the pumpdown times and power required to attain this ultimate vacuum may be increased with the use of a stiffer exhaust valve.
  • a first aspect provides a pump for pumping a gas from an inlet to an outlet, said pump comprising: an exhaust valve for opening or closing said outlet to allow or impede fluid flow through said outlet; wherein said exhaust valve is configured such that a resistance of said exhaust valve to opening said outlet varies in dependence upon a pressure of said gas being pumped.
  • the inventor of the present invention recognised that the properties of a pump are affected by the resistance to opening or stiffness of the exhaust valve. He also recognised that the properties of the valve which provide improved operation of the pump will change during the pumping process. In particular, a stiffer more resistant exhaust valve may be advantageous in impeding leakage at higher pressure differentials, but may have a significantly detrimental effect at higher fluid flows where it will impede this fluid flow. This impeding of the fluid flow leads to increased power requirements, increased heat generation and a decreased flow rate for the pump.
  • a pump could be provided where the exhaust valve adapts to the current conditions and allows the operational properties of the pump to be optimised or at least improved across a wide operating range.
  • said exhaust valve comprises: a biasing means for biasing said exhaust valve towards a closed position, said exhaust valve being configured such that said biasing force varies in dependence upon said pressure of said gas being pumped.
  • the resistance to the exhaust valve opening may be provided in a number of different ways, in some embodiments, it is provided by a biasing means, the biasing force of the biasing means being controlled in dependence upon the pressure of the gas being pumped. In this way the exhaust valve’s resistance to opening can be controlled such that it varies with and is appropriate to current operating conditions.
  • said exhaust valve comprises an actuator configured to constrain said biasing means in dependence upon a pressure of said gas.
  • the biasing force of the biasing means may vary depending on how the biasing means is constrained and thus, can be controlled by using an actuator to constrain the biasing means by different amounts in dependence upon the gas pressure.
  • the biasing means is a spring
  • holding the spring in a more compressed state will increase the biasing force exerted by the spring.
  • the biasing means is a flexible member, decreasing the length that is free to flex will increase the biasing force required to produce the same amount of flexion.
  • the actuator may be formed in a number of ways, and in some embodiments, comprises a piston, movement of said piston being triggered by changes in pressure at an inlet of said pump.
  • a piston one end of which is linked to the gas being pumped, is a simple way of providing movement that is directly controlled by pressure changes in the gas.
  • the pump comprises a pressure sensor for sensing said pressure of said gas, said actuator being configured to constrain said biasing means in dependence upon said pressure sensed by said pressure sensor.
  • biasing means may be less directly constrained by using a pressure sensor which controls an actuator to move by an amount that depends on the pressure sensed.
  • said exhaust valve comprises a flexible plate for covering said outlet, said flexible plate being fixed to said pump at a fixed point and having a non-fixed free end, movement of said free end away from said outlet opening said outlet, said flexible plate comprising said biasing means and said valve being configured such that a stiffness of said flexible plate varies with said pressure of said gas being pumped.
  • a flexible exhaust plate configured to cover the outlet in the rest position. The flexible plate is fixed to the pump towards one end and the other end is free and able to move. The flexibility of the plate is varied in dependence upon the pressure of the gas pumped to adapt the properties if the exhaust valve to suit the current pumping conditions.
  • said exhaust valve further comprises an exhaust valve stop for limiting movement of said flexible plate, said exhaust valve stop being configured to contact said flexible plate at a point between said fixed point and said free end of said flexible plate, a flexibility of said exhaust plate being varied by varying a positon at which said exhaust valve stop contacts said exhaust valve plate.
  • the flexibility of a flexible plate will vary with the length of plate that is free to flex.
  • one way of varying the flexibility of such a plate is to change the point at which the plate is constrained, such that the length that is free to flex varies, and thus, the biasing force exerted by the plate also changes.
  • said actuator is configured to move said exhaust valve stop such that said contact point changes in dependence upon a pressure of said gas.
  • it may be the position of the flexible plate itself that is moved.
  • it is changes in the relative position of the flexible plate and the valve stop that changes the length of the flexible plate that is free to flex and thus, movement of one relative to the other will provide variations in the stiffness of the exhaust valve.
  • the exhaust valve stop constrains the movement of the plate at a certain point, thus, movement of the point that the exhaust stop contacts the flexible plate in a direction along the length of the plate between the fixed point and the free end, changes the length of the plate that is free to flex and thus, its resistance to flexing.
  • said valve comprises a valve member for closing said outlet and said biasing means comprises a spring for biasing said valve member towards said outlet.
  • said exhaust valve comprises a spring stop for limiting movement of said spring, said actuator being configured to move said spring stop such that a compression of said spring when said valve is in said closed position changes in dependence upon a pressure of said gas.
  • the biasing force of a spring can change depending on how the spring is constrained.
  • a movable stop to constrain one end of the spring by different amounts, makes the compression force exerted by the non-constrained end of the spring vary and allows the biasing force to be controlled.
  • said pressure comprises a pressure of said gas at said gas inlet.
  • the pressure of the gas being pumped affects the preferred properties of the exhaust valve.
  • the pressure at the inlet of the pump may be the pressure used to control the exhaust valve. This pressure is generally
  • said exhaust valve is configured such that said resistance to opening said exhaust valve increases as said pressure of said gas being pumped decreases.
  • the preferred properties of an exhaust valve will vary with pressure of the gas being pumped, a stiffer valve impeding flow and thus, being less preferable at higher flow rates, but also impeding leakage and thus, being more preferable at higher pressure differences.
  • a vacuum pump for example, initially during pump down when gas flows are high and pressure differences low, it is advantageous to have a flexible exhaust valve with a low resistance to opening allowing the fluid to flow in a free manner and reducing the power required and temperature increase associated with the flow and also increasing the pumping speed.
  • the stiffness of the exhaust valve As the pressure drops and the fluid flow rate falls, it becomes advantageous to increase the stiffness of the exhaust valve as this allows the ultimate pressure of the vacuum pump to be lower.
  • the change in stiffness of the valve with pressure may be done continually or it may be done in steps.
  • the actuator is a piston then the piston may move in response to any change in pressure, such that the flexibility is changed continually as the pressure changes.
  • the change may be done in steps in response to the pressure measured reaching or exceeding particular set pressure thresholds.
  • said pump comprises a plurality of outlets and a corresponding plurality of exhaust valves.
  • a pump may have a single outlet port and a corresponding exhaust valve, in some embodiments, there are multiple outlets and correspondingly multiple valves. Each valve has a means for closing the outlets that is biased by a biasing means. The multiple valves may share actuating means and in some cases, biasing means.
  • said pump comprises a vacuum pump.
  • said pump comprises a rotary vane oil-sealed vacuum pump.
  • a rotary vane oil-sealed vacuum pump lends itself particularly well to this technique. Even at very low pressures the oil being circulated will be pushed against the valve, so a stiff exhaust valve is opened even at low pressures by the oil pushing against the valve. This allows the stiffness of the exhaust valve to be increased at low pressures, where such a stiff valve increases the ultimate vacuum attainable by the pump.
  • a second aspect provides a method of varying a resistance to opening of an exhaust valve of a pump, said method comprising: constraining a biasing means for biasing said exhaust valve to a closed position, said constraining of said biasing means changing in dependence upon a pressure of said gas being pumped, such that a biasing force exerted by said biasing means varies in dependence upon a pressure of said gas being pumped.
  • Figure 1 schematically shows a rotary oil sealed vacuum pump with a variable stiffness exhaust valve according to an embodiment
  • Figure 2 shows the exhaust valve of the pump of Figure 1 in more detail
  • Figure 3 shows an alternative embodiment of a variable stiffness exhaust valve for a pump according to an embodiment
  • Figure 4 shows a portion of the exhaust valve of Figure 3
  • Figure 5 shows a further embodiment of a variable stiffness exhaust valve for use in a pump according to an embodiment
  • Figure 6 shows a flow diagram illustrating steps in a method of varying a stiffness of an exhaust valve according to an embodiment.
  • Embodiments provide a pump with an inlet, an outlet, a pumping chamber for moving gas from the inlet to the outlet and an exhaust valve.
  • the exhaust valve is configured to have a controllable resistance to opening, such that this can be changed in dependence upon a current operating state of the pump.
  • the resistance is varied in dependence upon a pressure of a gas being pumped.
  • the control is such that the variation changes continually in response to changes in pressure, while in other embodiments, the variation is controlled to change the resistance in steps, such that predefined changes in pressure trigger a certain change in the resistance of the exhaust valve.
  • Providing a pump with an exhaust valve that is configured such that the properties of the exhaust valve and in particular, its resistance to opening, vary in dependence upon the pressure of a gas being pumped allows the pump to operate with improved properties across a range of operating pressures. In particular, an improved ultimate pressure along with reduced pumping power, reduced temperature increases and improved pumpdown speeds may be achieved.
  • Changing the resistance to opening of the exhaust valve can be done by varying a biasing force of a biasing means configured to bias the exhaust valve towards its closed position.
  • An actuator can be used to move a member to constrain the biasing means by different amounts and change the biasing force in that way.
  • the biasing means may be a flexible finger or plate and changing the length of the plate that can flex will change the force required to flex the plate and thus, the biasing force biasing the plate to its rest closed position.
  • a valve stop means may be moved to constrain the flexible plate at different positions along its length allowing the length of the flexible portion to change and thereby change the stiffness of the valve.
  • the biasing means may be a spring and this can be held in a compressed state at rest, the amount of compression being dependent on a position of the valve stop constraining the valve, the valve stop being movable to change its position and thereby the biasing force.
  • the pump is a vacuum pump, then it is advantageous if the exhaust valve stiffness is increased with decreasing pressure where flow rates are reduced and the pressure differentials are higher.
  • the pump is a compressor then it is advantageous if the exhaust valve stiffness is increased with increasing pressure where flow rates are reduced and the pressure differentials are higher.
  • FIG. 1 shows a rotary vane oil-sealed vacuum pump having an exhaust valve according to an embodiment.
  • Rotary vane pump 5 comprises an inlet 10 providing access to a pumping chamber formed by a rotor 12 mounted to rotate eccentrically within stator 14.
  • rotor 12 comprises vanes 13 slidably mounted within rotor 12 and able to change their length as the rotor rotates eccentrically.
  • the stator 14 comprises an outlet or exhaust port 16.
  • the outlet 16 is closed by a flexible exhaust plate 20 which in this embodiment is configured to flex in response to the rotor blades pushing fluid against the plate allowing fluid to exit via the exhaust.
  • this pump in this example is an oil sealed pump in addition to the gas being pumped, there is also some oil present within the pumping chamber and this oil will also be forced out through the outlet 16 by rotation of rotor 12.
  • the exhaust plate 20 is fixed to the stator 14 at a fixed point 21 , while the end adjacent to the outlet 16 is not fixed and is free to move.
  • the exhaust valve further comprises a valve stop 26 which limits the movement of the exhaust plate 20.
  • the exhaust plate 20 and valve stop 26 are mounted within a fixing guide 28, the exhaust plate being fixed and the valve stop being mounted such that it can move longitudinally within the guide.
  • valve stop 26 has a straight portion up until point 26a at which point it curves away from the flexible plate 20.
  • the portion of valve stop below and up to point 26a hold the exhaust plate 20 in position against stator 14, while the upper curved portion allows the exhaust plate to flex and move away from the stator.
  • the valve stop 26 is mounted to slide in a longitudinal direction supported within fixing guide 28 such that point 26a and the portion of the valve stop 26 contacting the valve plate 20 moves between the fixed point 21 and the free end of the exhaust plate thereby changing the length of the flexible exhaust plate 20 that is free to flex and in this way the biasing force required to flex the plate into an open position and thus, the stiffness of the exhaust valve.
  • the longitudinal movement of the valve stop is achieved via a piston 22 which is driven by gas received from the inlet of the pump via a connecting passage or conduit 30.
  • Piston 22 is biased towards an upper position by spring 24, and is connected at its lower end to valve stop 26.
  • Increases in pressure of the gas at the inlet 10 of the pump increases the force exerted by the gas on the piston head 22 and causes it to press against spring 24 and move downwards, thereby moving the valve stop 26 in a corresponding manner.
  • This increases the length of the exhaust plate 20 able to flex and thus, the flexibility of the plate, thereby reducing the stiffness of the exhaust valve at higher inlet pressures when fluid flow is higher.
  • the spring 24 pushes the piston head 22 upwards and the valve stop moves in a corresponding direction. This decreases the length of the exhaust plate 20 that can flex and increases the stiffness of the exhaust valve.
  • FIG. 2 shows the valve stop 26, fixing guide plate 28 and piston 22 in further detail.
  • the fixing guide plate 28 has side extensions for retaining the valve stop 26 laterally, while allowing it to slide in a longitudinal direction.
  • the valve stop has three fingers 26’ 26” and 26”’, which correspond to three flexible fingers on the exhaust plate 20 which cover three outlets.
  • the valve stop 26 is mounted to slide in a direction perpendicular to the lateral walls of fixing guide plate 28 in response to movement of the piston 22 as shown by the arrows.
  • three outlets and a corresponding three flexible fingers are shown, the skilled person would understand that the number of outlets and corresponding exhaust plate fingers can vary from a single finger and corresponding single outlet to multiple of each, depending on the embodiment.
  • Figure 3 shows an alternative embodiment, where the exhaust valve 40 provides a sealing portion that is biased towards a closed position in which it obstructs the outlet by biasing means 42, which in this embodiment comprises a helical spring.
  • Spring 42 is held at one end - the end that is remote from the end contacting exhaust valve 40 by spring stop means 44.
  • Spring stop means 44 is movably mounted such that it can slide in a horizontal direction as shown by the arrows. It is connected to piston 22 such that changes in inlet pressure Pi cause piston head 22 to slide and spring stop 44 to move accordingly, thereby changing the biasing force exerted by spring 42.
  • Piston head 22 is biased towards spring stop 44 by spring 24.
  • Figure 4 shows how the spring stop 44 is slidably mounted in guides 46 and is pushed laterally by piston head 22.
  • the exhaust valve 40 may be configured to obstruct a single outlet from the pump or it may be configured to obstruct multiple outlets.
  • Figure 5 shows an embodiment, where the actuator is a motor 54 that is controlled by signals received from pressure sensor 56.
  • Pressure sensor 56 is mounted on the inlet flange of the pump and monitors the inlet pressure of gas being pumped by the pump. Signals from the pressure sensor are directed via relay 52 to motor 54 which is configured to laterally slide spring stop 44 in a similar way to the embodiment of Figure 3 and thereby change the biasing force exerted by helical spring 42 on exhaust valve 40.
  • This embodiment may be configured such that the motor 54 makes step changes in the position of spring stop 44 in response to the pressure sensor indicating changes in pressure above a predetermined value.
  • Figure 6 shows a flow diagram schematically showing a method of varying a stiffness of the vacuum pump exhaust valve of Figure 5.
  • the method comprises measuring the inlet pressure of a gas input to the pump. The change in pressure of the inlet gas is determined and when it has changed by more than a
  • the spring stop is moved. If the inlet pressure has decreased then the spring stop is moved towards the pump exhaust thereby increasing the stiffness of the exhaust valve, whereas if it has increased then the spring stop is moved away from exhaust valve thereby decreasing the stiffness of the exhaust valve.
  • the amount that the spring stop is moved will depend on the change in pressure.
  • the motor may be a step motor and the number of steps taken by the motor will be dependent on the change in pressure.
  • predetermined value provides a movement of one step and multiples of the predetermined value providing multiple steps.
  • This method is slightly different to a method performed in conjunction with the embodiments of Figures 1 to 4, where any change in inlet pressure is fed automatically via the piston to the constraining means for constraining the biasing means as opposed to in a step wise fashion where predetermined values are exceeded before any change is triggered.
  • the biasing means is constrained to exert a higher biasing force in response to a decrease in pressure and a lower biasing force in response to an increase in pressure.
  • the exhaust valve is on a compressor then the apparatus and method will be configured such that the constraining means constrains the biasing means to exert a higher biasing force as pressure increases and flow rates drop.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

L'invention concerne une pompe pour pomper un gaz d'une entrée vers une sortie. La pompe comprend : une soupape d'échappement pour ouvrir ou fermer la sortie afin de permettre ou d'empêcher un écoulement de fluide à travers la sortie. La soupape d'échappement est conçue de telle sorte qu'une résistance de la soupape d'échappement à l'ouverture de la sortie varie en fonction d'une pression du gaz pompé.
PCT/EP2020/062189 2019-05-03 2020-05-01 Pompe avec soupape d'échappement WO2020225145A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP19305569.6 2019-05-03
EP19305569 2019-05-03
GB1907529.0A GB2583542B (en) 2019-05-03 2019-05-28 Pump with exhaust valve
GB1907529.0 2019-05-28

Publications (1)

Publication Number Publication Date
WO2020225145A1 true WO2020225145A1 (fr) 2020-11-12

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ID=66625883

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2020/062189 WO2020225145A1 (fr) 2019-05-03 2020-05-01 Pompe avec soupape d'échappement

Country Status (2)

Country Link
GB (1) GB2583542B (fr)
WO (1) WO2020225145A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2237013A (en) * 1938-10-20 1941-04-01 Gen Electric Valve assembly
US6102682A (en) * 1998-04-18 2000-08-15 Samsung Electronics Co., Ltd. Slidable discharge valve in a hermetic rotary compressor
GB2383113A (en) * 2001-12-15 2003-06-18 Delphi Tech Inc Pressure regulating device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2532045C (fr) * 2005-01-18 2009-09-01 Tecumseh Products Company Compresseur rotatif comprenant un clapet de refoulement
JP6251822B2 (ja) * 2014-11-21 2017-12-20 日立オートモティブシステムズ株式会社 可変容量形ベーンポンプ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2237013A (en) * 1938-10-20 1941-04-01 Gen Electric Valve assembly
US6102682A (en) * 1998-04-18 2000-08-15 Samsung Electronics Co., Ltd. Slidable discharge valve in a hermetic rotary compressor
GB2383113A (en) * 2001-12-15 2003-06-18 Delphi Tech Inc Pressure regulating device

Also Published As

Publication number Publication date
GB201907529D0 (en) 2019-07-10
GB2583542B (en) 2021-10-13
GB2583542A (en) 2020-11-04

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