US20040197196A1 - Vacuum producing device - Google Patents

Vacuum producing device Download PDF

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Publication number
US20040197196A1
US20040197196A1 US10/793,093 US79309304A US2004197196A1 US 20040197196 A1 US20040197196 A1 US 20040197196A1 US 79309304 A US79309304 A US 79309304A US 2004197196 A1 US2004197196 A1 US 2004197196A1
Authority
US
United States
Prior art keywords
producing device
vacuum producing
set forth
monitoring unit
pressure monitoring
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.)
Abandoned
Application number
US10/793,093
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English (en)
Inventor
Udo Matheis
Yvonne Krehl
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
Application filed by Festo SE and Co KG filed Critical Festo SE and Co KG
Assigned to FESTO AG & CO. reassignment FESTO AG & CO. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KREHL, YVONNE, MATHEIS, UDO
Publication of US20040197196A1 publication Critical patent/US20040197196A1/en
Abandoned 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

Definitions

  • the invention relates to a vacuum producing device comprising at least one ejector unit, which comprises a nozzle connected with a supply connection, a receiving nozzle placed downstream from the nozzle and an aspiration zone defined in the transition region between the nozzle and the receiving nozzle and connected by way of an aspiration duct with an aspiration connection and furthermore a pressure monitoring unit, which has a pressure sensor connected with the aspiration duct.
  • a vacuum producing device disclosed in the German patent publication 3,818,381 A1 of this type possesses a device housing, which contains an ejector unit and which externally has a plurality of components mounted on it, including a pressure monitoring unit for the pressure in the aspiration duct.
  • the dimensions of this vacuum producing device are relatively large so that it is not really suitable for installation on a suction gripper for handling of objects.
  • the connection with the suction gripper is therefore generally produced using a separate line or pipe.
  • One object of the invention is to provide a compactly designed vacuum producing device.
  • the ejector unit and the pressure monitoring unit accordingly possess a common housing so that it is possible to dispense with separate individual housings and the structure may have compact dimensions.
  • the ejector unit serving for the production of a vacuum and the pressure monitoring unit for monitoring the production of vacuum are accordingly integrated in a common housing, the saving in space and weight thus made possible meaning that the device is well suited for the direct integration in suction grippers.
  • the pressure monitoring unit is preferably accommodated in an accommodating chamber of the device housing termed a sensor accommodating chamber, assembly being substantially simplified owing to having a housing cover. Since the housing cover can be later removed for access to the sensor accommodating chamber, in the case of a defect speedy replacement of the pressure monitoring unit is possible.
  • the vacuum producing device is extremely convenient as regards fitting since after removal of the housing cover detachable placement of the pressure monitoring unit in the sensor accommodating chamber is possible.
  • the pressure monitoring unit may be firstly installed and then the housing cover may be put in place without the danger of the pressure monitoring unit falling out.
  • the ejector unit and the pressure monitoring unit are preferably separately accommodated on the one hand in an ejector accommodating chamber and on the other hand in a sensor accommodating chamber in the housing of the device. Neither the ejector unit nor the pressure monitoring unit needs a housing of its own, since the housing of the device performs the common housing function for both units.
  • the pressure monitoring unit is so designed that an external electronic control means may be connected.
  • it possesses an electromechanical interface permitting the connection of such means.
  • the interface is preferably on the same outer side of the device housing as the supply connection of the ejector unit, the same orientation contributing to an improved ease of connection.
  • a more particularly short overall length is to be achieved, if the ejector unit and the pressure monitoring unit are placed at the same level alongside each other as related to the principal axis of the device housing. It is in this manner that furthermore short paths are produced between the pressure monitoring unit and the aspiration duct, something which improves the response behavior of the pressure sensor.
  • optical display means capable of indicating at least one operational state of the pressure monitoring unit, as for example the maintenance of a predetermined vacuum.
  • the pressure monitoring unit does not need any separate housing of its own.
  • it comprises essentially a board, which is fitted with the pressure sensor and suitable evaluating electronic circuitry and preferably furthermore with an electromechanical interface for the connection of an external means.
  • the evaluating electronic circuitry comprises a micro-controller, settings may be adjusted in a highly convenient manner, for example to set the response thresholds, at which sensor signals are produced in accordance with the needs of the user.
  • the task may also be very easily performed on site, if the vacuum producing device has operating means accessible from the outside. Such operating means may for instance comprise a key extending through the device housing.
  • the single figure thereof shows a longitudinal section of a preferred embodiment of the vacuum producing device.
  • the vacuum producing device generally referenced 1 possesses an ejector unit 2 and a pressure monitoring unit 3 , which, as considered separately, do not have housings and instead are arranged in common device housing 4 of the vacuum producing device 1 .
  • a multiple provision of the device housing 4 with a plurality of ejector units 2 and/or a plurality of pressure monitoring units 3 is possible.
  • the two units 2 and 3 are in the singular, as is considered to be optimum.
  • the device housing 4 is provided with two accommodating chambers, which in the following are termed the ejector accommodating chamber 5 and the sensor accommodating chamber 6 , the ejector accommodating chamber 5 containing the ejector unit 2 and the sensor accommodating chamber 6 containing the pressure monitoring unit 3 .
  • the ejector unit 2 comprises a nozzle 7 with a nozzle duct 8 and a receiving nozzle 2 with a receiving nozzle 12 having its receiving nozzle duct 13 .
  • the ejector unit 2 is designed like a cartridge, the nozzle 7 and the receiving nozzle 12 preferably being axially inserted into one another.
  • the ejector unit 2 has an elongated form
  • connection device 16 defining a supply connection 15 is secured.
  • the supply connection 15 consequently communicates the with the nozzle 7 .
  • the connection device 16 is designed to be able to connect a compressed air line or hose, connected with a source of pressure, in a sealed manner.
  • the receiving nozzle 12 is placed downstream from the nozzle 7 . It communicates on all sides with the atmosphere, it being connected in the working example with an outlet opening 17 in the device housing 4 , which is fitted with a muffler 19 .
  • the nozzle duct 8 and the nozzle receiving duct 13 are spaced apart, the resulting intermediate space defining an aspiration zone 18 .
  • This zone is connected by way of an aspiration duct 22 with an aspiration connection 23 , which in the working example is delimited by a further connection device 24 fixed to the housing and which renders possible the connection of a pressure medium line.
  • the vacuum producing device is more particularly employed to produce a vacuum at a predetermined level in a space, which is to be evacuated, connected with the aspiration connection 23 .
  • the space to be evacuated may more especially be delimited as the interior space of a suction gripper constituted for example by a suction cup or a suction plate, which is part of a vacuum handling instrumentality, with whose aid any desired objects may be held by vacuum and/or conveyed. Since the vacuum producing device 1 has extremely compact dimensions, it may be directly arranged on such a suction gripper so that the suction gripper and the vacuum producing device 1 constitute a single unit.
  • the pressure monitoring unit 3 possesses a pressure sensor 25 , which is connected by way of a tapping duct 26 with the aspiration duct 22 .
  • the tapping duct 26 extends through a partition 27 separating the ejector accommodating chamber 5 from the sensor accommodating chamber 6 , of the device housing 4 .
  • the pressure sensor 25 is mounted on a board 28 , which furthermore carries evaluating electronic circuitry 32 . Moreover the board has an electromechanical interface 33 on fixed it, which is connected electrically with the evaluating electronic circuitry 32 , such interface 33 being for example designed as a plug device and permitting the connection of an electric cable, not illustrated, by way of which the connection to an external electrical control means may be produced.
  • the pressure monitoring unit 3 of the working example is thus composed of the board 28 , the pressure sensor 25 , the evaluating electronic circuitry 32 and the electromechanical interface 33 .
  • the electromechanical interface 33 which is accessible from the outside and may protrude a bit past the outer face of the device housing 4 , all components of the pressure monitoring unit 3 are accommodated in the interior of the device housing 4 and screened off from the surroundings.
  • the pressure sensor 25 measures pressure obtaining in the aspiration duct 22
  • the evaluating electronic circuitry 32 producing a sensor signal on the basis of the measurements and such signal may be tapped at the electromechanical interface 33 . It is in this manner that a control of the ejector unit 2 is possible on the basis of the instantaneous pressure obtaining in the aspiration duct 22 .
  • the supply of compressed air to the supply connection 15 may be interrupted for example when and as long as the desired vacuum is present in the aspiration duct 22 .
  • the evaluating electronic circuitry 32 comprises a micro-controller 34 . Same permits customized programming and more especially allows the setting of predetermined pressure values, at which the evaluating electronic circuitry 32 produces particular sensor signals. It is accordingly possible for example to set the upper and lower pressure threshold, which define the vacuum to be maintained during operation.
  • actuating means 35 are provided which are accessible from and outside which render possible simple adjustment of the settings of the micro-controller on site.
  • keys 36 which extend through the wall of the device housing 4 and may be depressed from the outside manually or with a small tool so that same act on the micro-controller 34 by causing a setting operation.
  • optical display means 37 it is furthermore advantageous for optical display means 37 to be provided on the outer side of the device housing 4 to serve for the display of at least one operational state of the vacuum producing device 1 .
  • the display means 37 comprise a light guide, which extends into the ejector accommodating chamber 5 where it is opposite to at least one light element 38 , whose light is passed to the outside to be readily visible.
  • the ejector unit 2 and the pressure monitoring unit 3 respectively preferably have an elongated shape. As related to a principal axis 42 of the device housing the two units 2 and 3 in the working example are so placed that they are arranged at the same level parallel to each other. It is in this manner that a compact structure with small longitudinal dimensions of the device housing 4 is made possible.
  • the tapping duct 26 may be made extremely short. It opens at the longitudinal side into the ejector accommodating chamber 5 so that the vacuum is measured in the direct vicinity of the aspiration zone 18 and hence short measurement paths and a correspondingly high accuracy of measurement are achieved.
  • the tapping duct 26 opens into a recess 43 in the partition 27 belonging to the sensor accommodating chamber 3 , into which the pressure sensors 25 extends through an intermediate seal 44 .
  • the recess 43 is consequently sealed off from the remaining part of the sensor accommodating chamber 6 , in which the pressure monitoring unit 3 is located.
  • the two units 2 and 3 are both placed in a principal plane, coinciding with the principal axis 42 , of the device housing 4 such plane being identical to the plane of the drawing. Considered at a right angle to this the vacuum producing device is very narrow. There is more especially a provision such that the supply connection 15 , the aspiration connection 13 and the electromechanical interface 33 lie in this principal plane and are aligned in the direction of extent of the principal plane.
  • the lectromechanical interface 33 and the supply connection 15 are arranged in a common, front outer side 45 of the device housing 4 and are identically orientated and aligned with the principal axis 42 .
  • the aspiration connection 23 in the said principal plane is directed to the side.
  • the outlet opening 17 also lying in the principal plane, is preferably located on the rear outer side 46 opposite the front outer side 45 , of the device housing 4 .
  • the aspiration connection 23 and the outlet opening 17 may be interchanged as well.
  • One or more through holes 47 extend through the device housing 4 at a right angle to the principal plane to receive screws, for example, serving to fix the vacuum producing device 1 on some suitable support structure, as for example on a suction gripper.
  • Further attachment means 55 render possible securing the pressure monitoring unit 3 even after removal of the housing cover in the desired position of installation.
  • the further attachment means 55 comprise the pressure sensor 25 , the annular sensor 44 surrounding it, and the recess 43 . These components may be plugged into each other so that the resulting friction holds the pressure monitoring unit 3 on the remaining housing component 54 temporarily. Then the housing cover 52 may be readily put in position and secured.
  • the setting means 35 and the display means 37 are preferably arranged on the removable housing cover 52 .
  • the housing cover 52 extends preferably along the elongated sensor accommodating chamber 6 so that when the cover 52 is removed the latter chamber is accessible along its full length and accordingly the pressure monitoring unit 3 may be inserted in the transverse direction.

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)
  • External Artificial Organs (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Manipulator (AREA)
US10/793,093 2003-04-03 2004-03-04 Vacuum producing device Abandoned US20040197196A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP03400009.1 2003-04-03
EP03400009A EP1464842B1 (fr) 2003-04-03 2003-04-03 Dispositif pour l'obtention d'un vide

Publications (1)

Publication Number Publication Date
US20040197196A1 true US20040197196A1 (en) 2004-10-07

Family

ID=32842883

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/793,093 Abandoned US20040197196A1 (en) 2003-04-03 2004-03-04 Vacuum producing device

Country Status (4)

Country Link
US (1) US20040197196A1 (fr)
EP (1) EP1464842B1 (fr)
AT (1) ATE306619T1 (fr)
DE (1) DE50301356D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100150743A1 (en) * 2008-12-12 2010-06-17 Norgren Automotive, Inc. Single Line Venturi Apparatus
US20160047396A1 (en) * 2014-06-11 2016-02-18 Bilsing Automation Gmbh Vacuum Generator on the Ejector Principle

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202006020267U1 (de) * 2006-06-07 2008-02-21 J. Schmalz Gmbh Unterdruckerzeuger
FR2929663B1 (fr) * 2008-04-03 2012-10-05 Coval Generateur de vide autoregule.
DE102009047082A1 (de) 2009-11-24 2011-05-26 J. Schmalz Gmbh Druckluftbetriebener Unterdruckerzeuger
DE102011006826A1 (de) 2011-04-06 2012-10-11 J. Schmalz Gmbh Vorrichtung zum Spannen, Greifen und/oder Manipulieren von Gegenständen mittels Unterdruck

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4432701A (en) * 1981-04-07 1984-02-21 Yoji Ise Vacuum controlling device
US4655692A (en) * 1984-06-20 1987-04-07 Myotoku Ltd. Ejector pump having pressure operated motive fluid valve and electromagnetic change-over valve
US4865521A (en) * 1987-05-30 1989-09-12 Myotoku Ltd. Vacuum breaking device for ejector pump
US5244242A (en) * 1990-01-24 1993-09-14 Mannesmann Aktiengesellschaft Manipulator with a suction gripper and method for handling and testing fluid-passing components
US5320497A (en) * 1991-06-26 1994-06-14 Smc Kabushiki Kaisha Vacuum feeding apparatus
US5601415A (en) * 1991-09-10 1997-02-11 Smc Kabushiki Kaisha Fluid pressure device
US5683227A (en) * 1993-03-31 1997-11-04 Smc Corporation Multistage ejector assembly
US6390781B1 (en) * 1999-07-15 2002-05-21 Itt Manufacturing Enterprises, Inc. Spa pressure sensing system capable of entrapment detection
US6416295B1 (en) * 1999-09-03 2002-07-09 Smc Kabushiki Kaisha Vacuum-generating unit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3418411B2 (ja) * 1991-09-06 2003-06-23 Ｓｍｃ株式会社 真空ユニット

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4432701A (en) * 1981-04-07 1984-02-21 Yoji Ise Vacuum controlling device
US4655692A (en) * 1984-06-20 1987-04-07 Myotoku Ltd. Ejector pump having pressure operated motive fluid valve and electromagnetic change-over valve
US4865521A (en) * 1987-05-30 1989-09-12 Myotoku Ltd. Vacuum breaking device for ejector pump
US5244242A (en) * 1990-01-24 1993-09-14 Mannesmann Aktiengesellschaft Manipulator with a suction gripper and method for handling and testing fluid-passing components
US5320497A (en) * 1991-06-26 1994-06-14 Smc Kabushiki Kaisha Vacuum feeding apparatus
US5601415A (en) * 1991-09-10 1997-02-11 Smc Kabushiki Kaisha Fluid pressure device
US5683227A (en) * 1993-03-31 1997-11-04 Smc Corporation Multistage ejector assembly
US6390781B1 (en) * 1999-07-15 2002-05-21 Itt Manufacturing Enterprises, Inc. Spa pressure sensing system capable of entrapment detection
US6416295B1 (en) * 1999-09-03 2002-07-09 Smc Kabushiki Kaisha Vacuum-generating unit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100150743A1 (en) * 2008-12-12 2010-06-17 Norgren Automotive, Inc. Single Line Venturi Apparatus
US20160047396A1 (en) * 2014-06-11 2016-02-18 Bilsing Automation Gmbh Vacuum Generator on the Ejector Principle

Also Published As

Publication number Publication date
DE50301356D1 (de) 2006-02-23
ATE306619T1 (de) 2005-10-15
EP1464842B1 (fr) 2005-10-12
EP1464842A1 (fr) 2004-10-06

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Legal Events

Date Code Title Description
AS Assignment

Owner name: FESTO AG & CO., GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MATHEIS, UDO;KREHL, YVONNE;REEL/FRAME:015052/0174

Effective date: 20040217

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION