EP1288504B1 - Vakuumerzeugervorrichtung - Google Patents

Vakuumerzeugervorrichtung Download PDF

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Publication number
EP1288504B1
EP1288504B1 EP01120843A EP01120843A EP1288504B1 EP 1288504 B1 EP1288504 B1 EP 1288504B1 EP 01120843 A EP01120843 A EP 01120843A EP 01120843 A EP01120843 A EP 01120843A EP 1288504 B1 EP1288504 B1 EP 1288504B1
Authority
EP
European Patent Office
Prior art keywords
vacuum generator
generator device
collector
discharge passage
nozzle
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
EP01120843A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1288504A1 (de
Inventor
Jürgen Stingel
Volker Quendt
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.)
Festo SE and Co KG
Original Assignee
Festo SE and Co KG
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
Priority to EP01120843A priority Critical patent/EP1288504B1/de
Application filed by Festo SE and Co KG filed Critical Festo SE and Co KG
Priority to AT01120843T priority patent/ATE363029T1/de
Priority to DE50112524T priority patent/DE50112524D1/de
Priority to ES01120843T priority patent/ES2283363T3/es
Priority to JP2002251177A priority patent/JP2003083300A/ja
Priority to US10/231,406 priority patent/US6851936B2/en
Priority to CN02132122.1A priority patent/CN1280549C/zh
Publication of EP1288504A1 publication Critical patent/EP1288504A1/de
Application granted granted Critical
Publication of EP1288504B1 publication Critical patent/EP1288504B1/de
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
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/48—Control
    • F04F5/52—Control of evacuating pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/46—Arrangements of nozzles
    • F04F5/461—Adjustable nozzles

Definitions

  • the invention relates to a vacuum generating device, comprising at least one ejector device, which has a jet nozzle, a downstream of the jet nozzle and a suction defined in the transition region between the jet nozzle and the suction, wherein provided at the exit end of the trap a collecting space for the fluid flowing through the trap is, from which an outflow channel, and with means for influencing the fluid flow through the discharge channel.
  • DE 4302951 C1 discloses such a vacuum generator device, in the housing of which a catchment space is arranged following the exit end of the catching nozzle, which collects the fluid emerging from the catching nozzle and from which the fluid flows out through a subsequent outflow channel to the atmospheric environment can.
  • the collecting space is used to guide a movable piston, which is selectively positionable between an open position releasing the outflow channel and a closed position completely closing the outflow channel.
  • the piston In order to obtain a negative pressure in the suction zone, the piston assumes the open position and allows unhindered outflow of the fluid emerging from the catching nozzle. If the piston is positioned in the closed position, the fluid flowing through the catching nozzle is diverted to the suction zone, where it dissipates the negative pressure.
  • Vacuum generating devices are often used to handle objects, with a suction channel communicating with the suction zone leading to a suction gripper which can be attached to an object to be handled.
  • a suction channel communicating with the suction zone leading to a suction gripper which can be attached to an object to be handled.
  • a suitable high negative pressure is generated in the suction.
  • the negative pressure is reduced again.
  • this object is achieved by throttle means for variable specification of the effluent via the outflow fluid volume flow for the purpose of influencing the pressure prevailing in the collecting space pressure.
  • throttle means which allow a variable specification of the fluid flow rate.
  • a different high pressure a more or less large backlog of causes the trapping fluid flowing therethrough.
  • different working pressures can be provided in the suction zone, in order, for example, to be able to variably carry out a vacuum reduction depending on the type of objects to be handled or depending on the place of use.
  • the measured at the location of the narrowest cross section of the outflow channel Abströmkanal nominal diameter (d A ) should be greater than that at the location of the narrowest cross section of the jet nozzle channel measured jet nozzle channel nominal diameter (d S ) but smaller than the nominal diameter of catching nozzle duct (d F ) measured at the location of the narrowest cross-section of the capture nozzle channel.
  • this diameter matching unfolds its advantages even when no throttling means are provided as a means for influencing the fluid flow through the outflow channel, but for example simple shut-off means which optionally allow a maximum release or a complete closing of the outflow channel in the manner of a digital behavior.
  • the throttle means may in principle be designed so that they allow a stepwise variation of the fluid volume flow.
  • a design is considered more advantageous in which a continuous variation of the fluid volume flow is possible by the throttle means, which enables an optimal specification of the working pressure in the suction zone.
  • the throttle means expediently contain a relative to the outflow channel in different throttle positions positionable control member.
  • the control member is associated in particular with an outflow opening of the outflow channel, which is located at the end region of the outflow channel opposite the collecting space, that is, for example, outside the outflow channel.
  • the control member may be arranged opposite the outflow opening of the outflow channel.
  • a particularly simple variation of the throttle intensity is possible if the control member is spaced more or less far from the discharge opening, depending on the selected throttle position.
  • a discharge nozzle may be provided, wherein in the case of a replaceable arrangement it is possible alternatively to use discharge nozzles with different cross-sectional dimensions.
  • control element is part of a continuously operated, electrically actuated adjusting device
  • the desired volume flow and thus the desired pressure in the collecting space can be specified in a particularly simple and precise manner.
  • the adjusting device is expediently a proportional adjusting device.
  • the operating principle of the adjusting device is based in particular on electromagnetic and / or on piezoelectric principles of action.
  • the outflow channel be formed so that it opens to the atmospheric environment.
  • the designs of the vacuum generator device according to the invention also provide the possibility of making the course of the outflow channel and the placement of the outflow opening without special constraints.
  • the structural conditions of the vacuum generator device and in particular the conditions at the place of use can be easily taken into account.
  • the outflow opening can be placed laterally in order to keep the length dimensions of the vacuum generator device small.
  • a controlled or regulated specification of the working pressure prevailing in the extraction zone can take place.
  • a controlled or regulated specification of the working pressure prevailing in the extraction zone can take place.
  • any desired working pressure can be specified, which can be provided regardless of the location of the vacuum generator device, for example, regardless of the prevailing air pressure, constant.
  • the vacuum generator device designated in its entirety by reference numeral 1, contains at least one vacuum generator unit 2, which is equipped with at least one ejector 3, by which a negative pressure can be generated.
  • the ejector device 3 is housed in the embodiment in a housing 4 of the vacuum generator unit 2. It contains a jet nozzle 5 and a downstream of this catching nozzle 6. Blasting nozzle 5 and catching nozzle 6 are independent components in the embodiment, but could also be designed as a unit, for example, as a cartridge-like unit.
  • the jet nozzle 5 is penetrated by a jet nozzle channel 7.
  • a fluid under a feed pressure is fed into the ejector device 3 through the inlet opening 12 of the jet nozzle channel 7.
  • the feed pressure may be, for example, in the order of 5 bar.
  • the fluid is preferably a gaseous fluid and in particular compressed air.
  • the fed-in fluid flows through the jet nozzle channel 7, whose cross-section decreases in the direction of flow 13 indicated by an arrow.
  • the diameter of the jet nozzle channel 7 measured at the location of the narrowest cross section 14 should be designated as jet nozzle channel nominal diameter d S.
  • the catching nozzle channel 8 After passing through the jet nozzle channel 7, the fluid flows via an inlet opening 15 into the collecting nozzle channel 8, flows through it in the axial direction and exits at the opposite side via the outlet opening 16 from the collecting nozzle channel 8.
  • the catching nozzle channel 8 has a point narrowest cross-section 17 which is associated with the inlet opening 15, wherein the existing diameter there is designated as the catching nozzle channel nominal diameter d F. Starting at the Place narrowest cross section 17 increases the cross section of the collecting nozzle channel 8 up to the outlet opening 16, wherein the diameter measured there is designated as Fangdüsenenkanal-outlet diameter D 1 .
  • the inlet opening 15 of the collecting nozzle channel 8 is arranged in the flow direction 13 at a distance from the outlet opening 11 of the jet nozzle channel 7. In this way, located in the transition region between the jet nozzle 5 and the catching nozzle 6 is a designated suction zone 21 zone, which is in communication with a leading out of the housing 4 suction channel 22.
  • the fluid flowing through the jet nozzle 5 and the subsequent catching nozzle 6 causes a suction effect in the suction zone 21, so that a vacuum dependent on the design of the ejector device 3 can be generated there.
  • This vacuum can be tapped on the suction channel 22.
  • the tap is performed by a schematically indicated suction gripper 25 with the interposition of a suction line 26th
  • the suction pad 25 includes, for example, one or more suction cups or suction plates with at least one suction opening 27, wherein it can be attached with this suction opening 27 ahead of a hand-to-handle and, for example, lifting object.
  • the suction effect of the ejector device 3 also forms a vacuum in the suction gripper 25 which causes the item in question to stick and, for example, be lifted.
  • the fluid emerging from the catch nozzle channel 8 at first can expand in the adjoining collecting space 23 and then flows out through the outflow channel 24 to the atmosphere.
  • the outflow channel 24 are associated with means with which the flow through the outflow 24 through possible fluid flow can be influenced.
  • These influencing means designated generally by reference numeral 28 in the drawing, are preferably designed as throttling means 29 with which a variable specification of the fluid volume flow flowing out via the outflow channel 24 is possible.
  • the throttling expediently takes place at an outflow opening 32, which defines the narrowest cross section of the outflow channel 22 designated as outflow channel nominal diameter d A and which is expediently located on the outer end region of the outflow channel 24 opposite the collecting space 23.
  • a variable discharge pressure results within the collecting space 23.
  • the height of the discharge pressure has an effect on the fluid flow in the catching nozzle channel 8, as it causes an increasing backflow of the fluid flow in the catching nozzle channel 8 with increasing height. This reduces the throughput through the collecting nozzle channel 8 and consequently also the working pressure currently prevailing in the extraction zone 21.
  • the working pressure prevailing in the suction gripper 25 is increased. This pressure increase can be caused by appropriate actuation of the throttle means 29.
  • the working pressure of maximum height is set when, through the throttle means 29, comparable to a shut-off valve, the outflow opening 32 and thus the outflow channel 24 is completely closed.
  • the entire amount of fluid flowing in via the jet nozzle 5 is then conducted via the suction zone 21 to the suction gripper 25.
  • There is an overpressure fluid pulse which causes a dropping of the hitherto still adherent article.
  • the throttle means 29 contain a control member 33 which can be positioned in different throttle positions with respect to the outflow channel 24.
  • the positionability makes it possible in particular to vary the relative position between the control member 33 and the outflow opening 32 located at the outer end of the outflow channel 24.
  • the control member 33 is the discharge opening 32 expediently in the direction indicated by an arrow discharge 34 directly opposite. Depending on the selected throttle position This results in a more or less large distance of the control member 33 from the discharge opening 32.
  • the control member acts quasi as a reminduglied.
  • the exemplary embodiment shows a construction in which the control member 33 is formed by the piezo-bending element of a positioning device 35 based on a piezoelectric operating principle. According to the voltage applied to the control member 33, the result is a more or less large bending deflection, wherein the control member 33 is preferably positionable continuously in any position between two extreme positions.
  • the one extreme position is apparent from the drawing, here, the control member 33 is at a maximum distance from the discharge opening 32 and does not affect the outflowing fluid or only to a small extent.
  • the control member 33 is deflected so far that it completely covers the discharge opening 32, wherein the discharge opening 32 may be enclosed by a valve seat, if necessary, in order to ensure a reliable seal.
  • discharge opening 32 is defined by a discharge nozzle 36.
  • This outflow nozzle 36 is expediently a component which is separate relative to the housing 4 and is in particular removably fastened to the housing 4.
  • the vacuum generator unit 2 can optionally be equipped with outlet nozzles 36 different discharge channel nominal diameter d A , if necessary, in order to make a certain adjustment to the possible vacuum power of the ejector 3.
  • the outflow channel 24 includes an inner channel section passing through the housing 4, which opens into the collecting space 23 on the outer end and the outflow nozzle 36 can be placed, which defines an outer channel section including the outflow opening 32 of the outflow channel 24.
  • the inner channel section is executed with the largest possible cross-section, can by mere Replacement of the discharge nozzle 36, the available maximum outflow cross section can be specified as needed.
  • the adjusting device 35 is expediently carried out in continuous operation.
  • it is a proportional actuator in which the deflection of the control member 33 changes in proportion to the applied drive voltage.
  • the discharge channel nominal diameter d A is designed such that it is larger than the jet nozzle channel nominal diameter d S on the one hand and smaller than the nominal diameter of the collecting nozzle channel d F on the other hand.
  • the discharge channel nominal diameter d A is only slightly larger than the jet nozzle channel nominal diameter d S.
  • the discharge channel nominal diameter d A is expediently chosen to be substantially smaller than the catch nozzle channel nominal diameter d F.
  • the catch nozzle channel exit diameter D 1 is expediently larger than the three above-mentioned nominal diameters d S , d F or d A under all circumstances.
  • the outflow channel 24 Due to the decoupling of the discharge opening 32 of the catching nozzle 6, it is also possible to choose the course of the outflow channel 24 and the placement of the discharge opening 32 practically without restriction. If a slim construction is desired, the outflow channel, with respect to the longitudinal direction of the catching nozzle 6, can exit in the same direction, for example. If the aim is rather a short design, the outflow channel 24, for example, as shown in the drawing, go off to the side and in particular also have a discharge opening 32 oriented laterally with respect to the longitudinal axis of the catching nozzle 6.
  • the vacuum generator device 1 is preferably equipped with control and / or regulating means 37 which enable actuation of the throttling means 29 as a function of the working pressure prevailing in the suction zone 21.
  • the control and / or regulating means 37 expediently have a first pressure sensor 38, by means of which the working pressure prevailing in the suction zone 21 is detected and fed to the pressure signals, preferably electrical, as actual values of a control unit 41.
  • the control unit 41 then outputs, after comparing the actual values with a predetermined desired value, suitable electrical control signals to the adjusting device 35.
  • the transmission of the drive signals is indicated in the drawing at 42.
  • the setpoint values can expediently be set variably, which is illustrated at 43.
  • the desired setpoint is applied to the control unit 41 - this may be a conventional controller.
  • the control unit 41 then ensures, via appropriate control of the control member 33, that the outflow cross section available to the fluid in the region of the outflow channel 24 is dynamically changed such that the desired working pressure is established. This working pressure is so high that an object is securely gripped by the suction gripper 25.
  • a setpoint change takes place in the control unit 41 in order to generate a discharge pulse.
  • control of the control member 33 causes a dynamic change of the fluid in the region of the outflow 24 available Abströmqueriteses, so that the working pressure is highly dynamic - in particular in a few milliseconds - is set to the desired pressure.
  • control and / or regulating means 37 may include a second pressure sensor 44 which detects the pressure prevailing in the collecting space 23 and transmits corresponding pressure signals to the control unit 41.
  • the ejector device 3 can be designed either for subsonic flow or for supersonic flow.
  • a design for supersonic flow it is advisable to choose the dimensions of the collecting space 23 such that a supersonic flow zone 45 forming at the outlet end of the catching nozzle 6 does not experience any obstruction by the boundary walls of the collecting space 23.
  • the length of the collecting space 23 measured in the longitudinal direction of the collecting nozzle channel 8 is selected so that the supersonic flow zone 45 ends in front of the boundary wall 46 opposite the outlet opening 16 of the collecting nozzle channel 8.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
EP01120843A 2001-08-30 2001-08-30 Vakuumerzeugervorrichtung Expired - Lifetime EP1288504B1 (de)

Priority Applications (7)

Application Number Priority Date Filing Date Title
AT01120843T ATE363029T1 (de) 2001-08-30 2001-08-30 Vakuumerzeugervorrichtung
DE50112524T DE50112524D1 (de) 2001-08-30 2001-08-30 Vakuumerzeugervorrichtung
ES01120843T ES2283363T3 (es) 2001-08-30 2001-08-30 Dispositivo generador de vacio.
EP01120843A EP1288504B1 (de) 2001-08-30 2001-08-30 Vakuumerzeugervorrichtung
JP2002251177A JP2003083300A (ja) 2001-08-30 2002-08-29 真空製造装置
US10/231,406 US6851936B2 (en) 2001-08-30 2002-08-29 Vacuum producing device
CN02132122.1A CN1280549C (zh) 2001-08-30 2002-08-30 抽真空装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01120843A EP1288504B1 (de) 2001-08-30 2001-08-30 Vakuumerzeugervorrichtung

Publications (2)

Publication Number Publication Date
EP1288504A1 EP1288504A1 (de) 2003-03-05
EP1288504B1 true EP1288504B1 (de) 2007-05-23

Family

ID=8178473

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01120843A Expired - Lifetime EP1288504B1 (de) 2001-08-30 2001-08-30 Vakuumerzeugervorrichtung

Country Status (7)

Country Link
US (1) US6851936B2 (zh)
EP (1) EP1288504B1 (zh)
JP (1) JP2003083300A (zh)
CN (1) CN1280549C (zh)
AT (1) ATE363029T1 (zh)
DE (1) DE50112524D1 (zh)
ES (1) ES2283363T3 (zh)

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Publication number Priority date Publication date Assignee Title
US6820325B2 (en) * 2002-10-17 2004-11-23 Delaware Capital Formation, Inc. Integrated air flow control for a pick and place spindle assembly
CN100348871C (zh) * 2004-07-07 2007-11-14 浙江工业大学 组合真空发生器
DE102005025208B4 (de) * 2005-05-25 2007-07-12 Festo Ag & Co. Vakuumerzeugervorrichtung
SE530787C2 (sv) * 2007-01-16 2008-09-09 Xerex Ab Ejektoranordning med luftningsfunktion
CN101307783A (zh) * 2007-05-18 2008-11-19 富葵精密组件(深圳)有限公司 气动液体抽取装置
SE535891C2 (sv) * 2011-06-15 2013-02-05 Xerex Ab Regulatoranordning inrättad att i samverkan med en tryckluftsdriven vakuumgenerator upprätthålla ett undertryck i ett medelst vakuum aktiverat griporgan
US10753373B2 (en) * 2012-12-21 2020-08-25 Piab Aktiebolag Vacuum ejector nozzle with elliptical diverging section
GB2509183A (en) 2012-12-21 2014-06-25 Xerex Ab Vacuum ejector with tripped diverging exit flow nozzle
GB2509182A (en) 2012-12-21 2014-06-25 Xerex Ab Vacuum ejector with multi-nozzle drive stage and booster
GB2509184A (en) 2012-12-21 2014-06-25 Xerex Ab Multi-stage vacuum ejector with moulded nozzle having integral valve elements
US9120232B1 (en) * 2013-07-26 2015-09-01 Western Digital Technologies, Inc. Vacuum pick-up end effector with improved vacuum reading for small surface
CN103644149A (zh) * 2013-12-07 2014-03-19 四川锦宇化机有限公司 高压甲铵喷射器
CN105090133B (zh) * 2014-05-19 2017-11-17 江阴派姆汽车部件有限公司 真空泵装置以及一种制造所述真空泵装置的方法
GB201418117D0 (en) 2014-10-13 2014-11-26 Xerex Ab Handling device for foodstuff
EP3192756B1 (en) * 2016-01-15 2021-09-29 Piab Ab Controlling a vacuum system comprising a vacuum generator
EP3252317B1 (en) * 2016-06-01 2020-01-29 Piab Ab Controlling a vacuum system comprising a vacuum generator arrangement
DE102016215027A1 (de) * 2016-08-11 2018-02-15 Robert Bosch Gmbh Brennstoffzellenvorrichtung
US10729293B2 (en) 2017-02-15 2020-08-04 The Toro Company Debris blower incorporating flow ejector

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US4380418A (en) * 1981-02-25 1983-04-19 General Motors Corporation Vacuum pressure selection and generation device
JPS59160900U (ja) * 1983-04-15 1984-10-27 株式会社　妙徳 真空発生装置
JPS614900A (ja) * 1984-06-18 1986-01-10 Shoketsu Kinzoku Kogyo Co Ltd エゼクタ装置
JPH0353040Y2 (zh) * 1987-05-30 1991-11-19
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Also Published As

Publication number Publication date
US20030044287A1 (en) 2003-03-06
CN1280549C (zh) 2006-10-18
CN1407246A (zh) 2003-04-02
JP2003083300A (ja) 2003-03-19
US6851936B2 (en) 2005-02-08
DE50112524D1 (de) 2007-07-05
ES2283363T3 (es) 2007-11-01
EP1288504A1 (de) 2003-03-05
ATE363029T1 (de) 2007-06-15

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