EP0682751A1 - Vacuum pump device. - Google Patents

Vacuum pump device.

Info

Publication number
EP0682751A1
EP0682751A1 EP94903814A EP94903814A EP0682751A1 EP 0682751 A1 EP0682751 A1 EP 0682751A1 EP 94903814 A EP94903814 A EP 94903814A EP 94903814 A EP94903814 A EP 94903814A EP 0682751 A1 EP0682751 A1 EP 0682751A1
Authority
EP
European Patent Office
Prior art keywords
ejector
compressed air
pump
pressure
vacuum
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.)
Granted
Application number
EP94903814A
Other languages
German (de)
French (fr)
Other versions
EP0682751B1 (en
Inventor
Dieter Bergemann
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.)
Putzmeister Concrete Pumps GmbH
Original Assignee
Putzmeister Werk Maschinenfabrik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Putzmeister Werk Maschinenfabrik GmbH filed Critical Putzmeister Werk Maschinenfabrik GmbH
Publication of EP0682751A1 publication Critical patent/EP0682751A1/en
Application granted granted Critical
Publication of EP0682751B1 publication Critical patent/EP0682751B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
    • F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing
    • 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
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/42—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport
    • B28C5/4203—Details; Accessories
    • B28C5/4234—Charge or discharge systems therefor
    • B28C5/4244—Discharging; Concrete conveyor means, chutes or spouts therefor
    • B28C5/4258—Discharging; Concrete conveyor means, chutes or spouts therefor using pumps or transporting screws
    • 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
    • F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
    • F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids
    • F04F5/20—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids for evacuating
    • 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
    • F04F5/54—Installations characterised by use of jet pumps, e.g. combinations of two or more jet pumps of different type

Definitions

  • the invention relates to a vacuum pump device for the evacuation of the housing of a peristaltic pump that can be used as a thick matter feed pump and that is installed on a road vehicle that is equipped with on-board devices for generating compressed air for operation, e.g. a compressed air brake system of the vehicle and / or other compressors that can be carried on the vehicle or installed on the vehicle, as well as a vacuum pump unit, to the suction side of which the housing of the peristaltic pump is connected as a recipient.
  • a vacuum pump device for the evacuation of the housing of a peristaltic pump that can be used as a thick matter feed pump and that is installed on a road vehicle that is equipped with on-board devices for generating compressed air for operation, e.g. a compressed air brake system of the vehicle and / or other compressors that can be carried on the vehicle or installed on the vehicle, as well as a vacuum pump unit, to the suction side of which the housing of the peristaltic pump is connected as a recipient.
  • vacuum pump devices The purpose of such vacuum pump devices is to partially accelerate the regression of the circular cross-sectional shape of the pump hose, after it has been pressed against a housing wall by the squeeze rollers of the pump rotor and thereby squeezed together, by partially evacuating the housing of the peristaltic pump, in order to achieve the maximum as quickly as possible Intake and delivery cross-section to achieve the appropriate shape of the hose again (DE 36 07 836 AI).
  • the pump unit to which the housing of the peristaltic pump is connected as a recipient, is usually designed as a displacement pump, for example as a capsule pump, which has a pump rotor for driving either its own - electrical or hydraulic Drive motor or a gear that can be engaged and disengaged is provided, via which a drive coupling of the pump rotor to a power take-off of the vehicle engine is possible if necessary.
  • a displacement pump for example as a capsule pump, which has a pump rotor for driving either its own - electrical or hydraulic Drive motor or a gear that can be engaged and disengaged is provided, via which a drive coupling of the pump rotor to a power take-off of the vehicle engine is possible if necessary.
  • the vacuum pump unit is designed as an ejector which works on the principle of the jet pump, which is preferably designed as an air jet pump, the propellant gas jet of which can be branched off from the compressed air provided by the compressor.
  • the ejector provided as a vacuum pump unit which, in a design and functional arrangement known per se, consists of a driving nozzle that can be connected to the pressure outlet of the compressor, a catch nozzle that forms the outlet of the ejector, and a mouth opening that is adjacent to one another as seen in the flow direction of the compressed air the housing containing the propellant nozzle and the catching nozzle, to which the housing of the peristaltic pump to be evacuated can be connected as a recipient, is a structurally very simple functional element which is correspondingly inexpensive to manufacture or commercially available and since it does not contain any moving parts , is not subject to any significant wear and therefore does not require any maintenance work.
  • a check valve As a valve responding to the pressure difference between the recipient and the ejector, a check valve is suitable which, in a simple design of the vacuum pump device, is designed as a flap valve which responds to very small values of the pressure difference of only a few milibars and between them Function positions can be switched reliably.
  • an overflow valve controlled by the outlet pressure of the compressed air source and blocking the compressed air flow to the ejector is provided between the outlet of the compressed air source and the compressed air inlet of the air jet ejector, If the output pressure of the compressed air source drops and / or falls below an adjustable or fixed predetermined threshold value, then, as is provided in a further embodiment of the vacuum pump device, the air flow output of the ejector is counter the ambient atmosphere by means of a response to the pressure difference between the ejector outlet and the ambient atmosphere.
  • the valve can be shut off, which is controlled into its open position by a relatively higher pressure at the outlet of the ejector than the ambient pressure and which, when the pressure difference falls below a minimum value, reaches its locked position, also possible if the compressed air source fails or a pressure drop at the outlet thereof in the housing of the hose squeezing pump still maintain a minimum vacuum - at least for a limited time
  • This pressure-sensitive valve too, which blocks the ejector on the outlet side from the ambient pressure, and thus, when the ejector is shut off on the inlet side by a response of the overflow valve, also shuts off the housing of the peristaltic pump from the ambient atmosphere.
  • a 3/3-way valve which is connected directly upstream of the compressed air inlet of the ejector and which supports the drive nozzle connection from a first flow position in which a compressed air flow path leading from the compressed air source to the ejection nozzle of the ejector of the ejector, however, is shut off from the surrounding atmosphere, via a blocking position, in which the driving nozzle connecting piece of the ejector is shut off both against the compressed air outlet of the compressed air source and against the surrounding atmosphere, can be controlled in a second flow position, in which the ejector's nozzle connection with the surrounding If the atmosphere is connected and is blocked against the compressed air outlet of the compressed air source, the housing of the peristaltic pump can be ventilated via the ejector if necessary, whereby the housing of the peristaltic pump is ventilated when the vacuum pump device is switched off.
  • this can also be achieved by providing a 3/3-way valve which is directly upstream of the housing of the peristaltic pump and which has a first flow position in which the recipient Forming housing of the peristaltic pump connected to the vacuum chamber of the ejector and at the same time is locked against the ambient atmosphere, via a locking position in which both the recipient and the vacuum chamber of the ejector are locked against the ambient atmosphere, in a second flow position - a ventilation position is switchable, in which the recipient is in communicating connection with the surrounding atmosphere, but is blocked off from the vacuum chamber of the ejector, which in this configuration remains in communicating connection with the surrounding atmosphere via the trap nozzle.
  • Such 3/3-way valves can be designed as simple, manually operable 3-way valves with L-plug.
  • Low-noise operation of the vacuum pump device can be achieved in a simple manner by means of a conventional type of silencer connected downstream of its ejector.
  • FIG. 1 shows a block diagram of a vacuum pump device with an air jet ejector as a vacuum pump unit and a shut-off valve and connected between it and the recipient
  • FIG. 2 shows a vacuum pump device with an air jet ejector as a vacuum pump unit and a shut-off valve connected downstream thereof, in a block diagram representation corresponding to FIG. 1.
  • the vacuum pump device serves to generate a negative pressure in the housing 11 of a thick matter feed pump designed as a peristaltic pump, overall designated 12, by means of which the expansion of the pump hose 13 on both sides of the pumping operation promoted its length extending pinch point and thereby the flow of material to be pumped into the pump 12 is to be facilitated.
  • a peristaltic pump designed as a peristaltic pump, overall designated 12
  • an essentially circular disk-shaped rotor 16 is rotatably mounted about its central axis 14 and can be rotated, for example via the power take-off of the engine of a construction vehicle (not shown), on which the peristaltic pump together with other devices , for example a concrete mixer and / or a placing boom for concrete is mounted.
  • Two pinch rollers are freely rotatably mounted on the rotor about axes of rotation 19 and 21 which are parallel to the central axis 14 of the pump 12 and are arranged at the same distance from the central axis 14 at an azimuthal distance of 180 ° on the rotor.
  • a support wall 24 Arranged within the housing 11 of the pump 12 is a support wall 24, which extends between the pump inlet 22 and the pump outlet 23 and coaxially surrounds the rotor on a 180 "circumferential area and is fixed between the side walls of the pump housing 11 and the shape
  • the pump hose between the support wall 24 and the two pinch rollers 17 and 18 is alternating Grip the tube 13 on the inside of the support wall, squeezed together, the pinch point 27 migrating from the pump inlet 22 over the inner circumferential region of the support wall 24 to the pump outlet 23 and the material to be conveyed thereby being pushed through the pump hose 13.
  • an air jet ejector designated as a whole by 28, is provided, which is one of a compressed air jet passing through a flow arrow 31 is represented, an inlet-side driving nozzle 32 through which a driving jet flows and an exit-side catching nozzle 33, and an orifice 34 and 36 of the driving nozzle 32 or the catching nozzle 33, which, seen in the direction of flow of the driving jet 31, contains one another and delimits a vacuum chamber 37 Housing 29 with a suction connector 38., to which via an inlet check valve 39 and a 3-way valve 41 the chamber 42 of the peristaltic pump 12 delimited by the housing 11 of the peristaltic pump 12 can be connected as a recipient.
  • the compressed air flow passed through the ejector 28 in the evacuation mode of the ejector 28 and the pump chamber 42 connected to its suction port 38 is generated by a compressor 43 which is provided as an on-board unit of the vehicle and also for the compressed air supply to the compressed air braking system of the vehicle Stuff serves.
  • This compressor 43 is driven by the engine of the vehicle, while the peristaltic pump 12 can be driven via a power take-off of the drive unit of the vehicle that can be switched on and off, not shown.
  • a pressure-controlled overflow valve 47 is connected, which releases the passage of a compressed air flow from the compressed air outlet 44 of the compressor 43 to the inlet 46 of the ejector 28 as long as the output pressure of the compressor is greater than a defined threshold value of, for example, 8 bar, but blocks this flow path as soon as the output pressure of the compressor 43 drops below this threshold value.
  • the propellant air jet 31 emerging at high speed at the inner mouth opening 34 of the propellant nozzle which, viewed in the direction of flow of the propellant jet 31, has a continuously tapering flow cross section, tears air in the vacuum chamber 37 of the ejector 28 into the catch nozzle 33 of the ejector 28, which is transported together with the propellant air flow 31 to the compressed air outlet of the ejector 28 formed by the outer mouth opening 48 of the trap nozzle, where, due to a design of the trap nozzle which widens in the direction of flow, the speed of the emerging air flow mes is significantly reduced.
  • the catch nozzle 33 has a flow cross section which initially tapered and then widened again towards the outer mouth opening 48, which is significantly larger than that in the area of the outer opening 48 clear cross-section of the compressor-side, outer opening 46 of the driving nozzle in order to achieve a clear calming of the air flow exiting at the outlet 48 of the ejector 28, which, in order to reduce the operating noise, is also passed through a silencer 49 connected downstream of the ejector 28 becomes.
  • the check valve 39 provided between the intake port 38 of the ejector 28 and the 3-way valve 41, which is expediently arranged on the housing 11 of the peristaltic pump 12, is designed as a flap valve which, at very low pressure differences, between the check valve 39 the vacuum chamber 37 of the ejector and the chamber 42 of the squeeze pump housing 11 forming the recipient transitions into its open or locked position, this flutter valve 39 being caused by slightly higher pressure in the vacuum chamber 37 of the ejector 28 than in the recipient 42 in its Locked position is maintained and is switched to its open position by relatively higher pressure in the chamber 42 of the pump housing 11 than in the vacuum chamber 37 of the ejector 28.
  • the flap valve 39 which comes into its blocking position when the propellant air jet is exposed and the pressure increase in the vacuum chamber 37 of the ejector connected with it, provided that the 3-way valve is in its - shown - evacuation position at the same time Maintain negative pressure in the connected recipient.
  • the 3-way valve 41 is designed as a valve with a rotatable L-plug, which conveys the function of a 3/3-way valve which, from a first - shown - flow position, in which the pump housing 11 can be evacuated can be switched to a second flow position, the ventilation position, in which the evacuable chamber 42 of the peristaltic pump 12 can be switched via a blocking position, in which the pump housing 11 is blocked off both from the ambient atmosphere and from the ejector 28 is connected directly to the surrounding atmosphere via the tap 41.
  • a vacuum pump device 10 * 'suitable for evacuating the housing chamber 42 accommodating the rotor 16 and the delivery hose 13 of a peristaltic pump is assumed that its functional elements - compressor 43 , Overflow valve 47, 3-way valve 41, ejector 28, flutter valve 39 and silencer 49 with the correspondingly designated functional elements of the embodiment shown in FIG.
  • the suction nozzle 38 of the ejector 28 is connected directly to the evacuable chamber 42 of the housing 11 of the peristaltic pump 12; the 3-way valve 41 is between the overflow valve 47 and Ejector 28 is switched, and the flutter valve 39, which is used here as an output check valve of the ejector 28, is connected between the ejector 28 and the silencer 49.
  • the recipient 42 is ventilated via the 3-way valve 41 and the drive nozzle 32 of the ejector 28, which - with the delivery valve 39 closed - by means of the 3-way valve with the um ⁇ atmosphere can be connected.
  • the outlet pressure of the compressor 43 is between 6 and 8 bar
  • the compressed air flow used as the jet of the ejector 28, based on normal conditions has an amount of 200 1 / min.
  • the amount of air that can be conveyed from the recipient 42 in this configuration of the vacuum pumping devices 10, 10 'at the beginning of the evacuation operation is then approx. 150 1 / min, in the stationary operating state of the pump device 10, 10 'in the recipient 42 a negative pressure which has an absolute value of approx. 0.2 to 0.3 bar.
  • the vacuum pump unit 28 on its suction side is that Housing 11 of the peristaltic pump 12 is connected as a recipient, designed as an ejector working according to the principle of the steam jet pump, the driving air jet of which can be branched off from the compressed air generated by means of the compressor 43 of the vehicle brake system.

Abstract

In a vacuum pump device to evacuate the pump case (11) of a constricted tube pump (12) that is installed on a road vehicle with a compressed air braking system and that can be used as a concrete delivery pump, the vacuum pump unit (28), to the suction side of which the case (11) of the constricted tube pump (12) is connected as recipient, is designed as an ejector that works on the principle of an air jet pump and whose air jet can be branched from the compressed air produced by the compressor (43) of the vehicle braking system.

Description

Vakuum-PumpeinrichtungVacuum pumping device
Beschreibungdescription
Die Erfindung betrifft eine Vakuum-Pumpeinrichtung für die Evakuierung des Gehäuses einer als Dickstoff-För¬ derpumpe benutzbaren Schlauchquetschpumpe, die auf ei¬ nem Straßenfahrzeug installiert ist, das sowohl mit ei¬ nem zur Erzeugung von Druckluft für den Betrieb bordei¬ gener Einrichtungen, z.B. einer Druckluft-Bremsanlage des Fahrzeuges und/oder weiterer auf dem Fahrzeug mit¬ führbarer oder auf diesem installierter Geräte benötig¬ ten Kompressor ausgerüstet ist als auch mit einem Va¬ kuum-Pumpaggregat, an dessen Saugseite das Gehäuse der Schlauchquetschpumpe als Rezipient angeschlossen ist.The invention relates to a vacuum pump device for the evacuation of the housing of a peristaltic pump that can be used as a thick matter feed pump and that is installed on a road vehicle that is equipped with on-board devices for generating compressed air for operation, e.g. a compressed air brake system of the vehicle and / or other compressors that can be carried on the vehicle or installed on the vehicle, as well as a vacuum pump unit, to the suction side of which the housing of the peristaltic pump is connected as a recipient.
Zweck solcher Vakuumpumpeinrichtungen ist es, durch eine partielle Evakuierung des Gehäuses der Schlauch- Quetschpumpe die Rückbildung der kreisrunden Quer¬ schnittsform des Pumpenschlauches, nachdem er durch die Quetschrollen des Pumpenrotors gegen eine Gehäusewand gedrückt und dabei zusammengequetscht worden war, zu beschleunigen um möglichst rasch die maximalem Ansaug- und Förderquerschnitt entsprechende Form des Schlauches wieder zu erreichen (DE 36 07 836 AI) .The purpose of such vacuum pump devices is to partially accelerate the regression of the circular cross-sectional shape of the pump hose, after it has been pressed against a housing wall by the squeeze rollers of the pump rotor and thereby squeezed together, by partially evacuating the housing of the peristaltic pump, in order to achieve the maximum as quickly as possible Intake and delivery cross-section to achieve the appropriate shape of the hose again (DE 36 07 836 AI).
Bei derartigen Vakuum-Pumpeinrichtungen ist das Pump¬ aggregat, an das als Rezipient das Gehäuse der Schlauch¬ quetschpumpe angeschlossen ist, üblicherweise als Ver¬ drängerpumpe, z.B. als Kapselpumpe ausgebildet, die einen Pumpenrotor hat, zu dessen Antrieb entweder ein eigener - elektrischer oder hydraulischer Antriebsmotor oder ein ein- und auskuppelbares Getriebe vorgesehen ist, über das eine Antriebskopplung des Pumpenrotors mit einem Nebenabtrieb des Fahrzeugmotors im Bedarfs¬ fall möglich ist.In such vacuum pumping devices, the pump unit, to which the housing of the peristaltic pump is connected as a recipient, is usually designed as a displacement pump, for example as a capsule pump, which has a pump rotor for driving either its own - electrical or hydraulic Drive motor or a gear that can be engaged and disengaged is provided, via which a drive coupling of the pump rotor to a power take-off of the vehicle engine is possible if necessary.
Der hiernach durch die für einen effizienten Betrieb der Schlauchquetschpumpe erforderliche Evakuierung ih¬ res Gehäuses bedingte technische Aufwand ist erheblich und trägt daher entsprechend sowohl zu den Investi¬ tionskosten für das Fahrzeug als auch zu den Betriebs¬ kosten bei, da sowohl das Vakuum-Pumpaggregat als auch sein Antrieb verschleißbehaftet und daher wartungsbe¬ dürftig sind. Es kommt hinzu, daß übliche nach dem Ver¬ drängerprinzip arbeitende Vakuumpumpen gegen Kondens- wasser anfällig sind, das sich aus Wasser bilden kann, welches z.B. im Zuge einer bei einem Schlauchwechsel erfolgten Reinigung der Schlauchquetschpumpe in deren Gehäuse verblieben ist und bei normaler Betriebstempe¬ ratur verdampfen und in der Vakuumpumpe kondensieren kann, wodurch sowohl deren Funktionsfähigkeit beein¬ trächtigt als auch deren Standzeit reduziert werden kann.The technical outlay due to the evacuation of its housing, which is necessary for efficient operation of the peristaltic pump, is considerable and therefore contributes accordingly to both the investment costs for the vehicle and the operating costs, since both the vacuum pump unit and its drive is also subject to wear and therefore requires maintenance. In addition, conventional vacuum pumps operating according to the displacement principle are susceptible to condensed water, which can form from water which e.g. in the course of cleaning of the peristaltic pump, which took place during a hose change, remained in its housing and can evaporate at normal operating temperature and condense in the vacuum pump, as a result of which both its functionality and its service life can be reduced.
Aufgabe der Erfindung ist es daher, eine Vakuum-Pump¬ einrichtung der eingangs genannten Art anzugeben, die bei deutlich reduzierter Störanfälligkeit und, damit einhergehend, erhöhter Funktionszuverlässigkeit und Le¬ bensdauer gleichwohl mit erheblich geringerem techni¬ schen Aufwand und entsprechend reduzierten Kosten re¬ alisierbar ist. Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß das Vakuum-Pumpaggregat als ein nach dem Prinzip der Strahl-Pumpe, die bevorzugt als Luftstrahlpumpe ausge¬ bildet ist, arbeitender Ejektor ausgebildet ist, dessen Treibgasstrahl von der mittels des Kompressors bereit¬ gestellten Druckluft abzweigbar ist.It is therefore an object of the invention to provide a vacuum pump device of the type mentioned at the outset which, with a significantly reduced susceptibility to faults and, associated therewith, increased functional reliability and service life, can nevertheless be implemented with considerably less technical outlay and correspondingly reduced costs is. This object is achieved according to the invention in that the vacuum pump unit is designed as an ejector which works on the principle of the jet pump, which is preferably designed as an air jet pump, the propellant gas jet of which can be branched off from the compressed air provided by the compressor.
Die erfindungsgemäße Vakuum-Pumpeinrichtung vermittelt zumindest die folgenden Vorteile:The vacuum pump device according to the invention provides at least the following advantages:
Der als Vakuum-Pumpaggregat vorgesehene Ejektor, der, in für sich bekannter Gestaltung und funktioneller An¬ ordnung aus einer an den Druckausgang des Kompressors anschließbaren Treibdüse, einer den Auslaß des Ejektors bildenden Fangdüse und einem die in Strömungsrichtung der Druckluft gesehen einander benachbarten Mündungs¬ öffnungen der Treib- und der Fangdüse enthaltenden Ge¬ häuse besteht, an das als Rezipient das zu evakuierende Gehäuse der Schlauchquetschpumpe anschließbar ist, ist ein konstruktiv sehr einfaches Funktionselement, das entsprechend preisgünstig herstellbar oder kommerziell erhältlich ist und, da es keine beweglichen Teile ent¬ hält, keinem nennenswerten Verschleiß unterworfen ist und daher auch keinerlei Wartungsarbeiten erfordert.The ejector provided as a vacuum pump unit, which, in a design and functional arrangement known per se, consists of a driving nozzle that can be connected to the pressure outlet of the compressor, a catch nozzle that forms the outlet of the ejector, and a mouth opening that is adjacent to one another as seen in the flow direction of the compressed air the housing containing the propellant nozzle and the catching nozzle, to which the housing of the peristaltic pump to be evacuated can be connected as a recipient, is a structurally very simple functional element which is correspondingly inexpensive to manufacture or commercially available and since it does not contain any moving parts , is not subject to any significant wear and therefore does not require any maintenance work.
Durch ein zwischen den Ansaugstutzen des Luftstrahl- Ejektors und das Gehäuse der Schlauchquetschpumpe ge¬ schaltetes, auf die innerhalb des Gehäuses des Ejektors sowie im Rezipienten herrschenden Drücke ansprechendes Ventil, das durch relativ höheren Druck im Gehäuse der Schlauchquetschpumpe als in der Unterdruckkammer des Ejektors in seine Offen-Stellung und durch relativ hö¬ heren Druck in der Unterdruckkammer des Ejektors in seine Sperrstellung steuerbar ist, wird erreicht, daß bei einem Ausfall der Druckluftquelle in dem Gehäuse der Schlauchquetschpumpe ein Unterdruck aufrechterhal¬ ten bleibt.By switching between the intake manifold of the air jet ejector and the housing of the peristaltic pump, which responds to the pressures prevailing within the housing of the ejector and in the recipient Valve, which can be controlled into its open position by relatively higher pressure in the housing of the peristaltic pump than in the vacuum chamber of the ejector and into its blocking position by relatively higher pressure in the vacuum chamber of the ejector, ensures that if the compressed air source fails in A negative pressure is maintained in the housing of the peristaltic pump.
Als auf die Druckdifferenz zwischen Rezipient und Ejek¬ tor ansprechendes Ventil eignet sich ein Rückschlagven¬ til, das in einfacher Gestaltung der Vakuum-Pumpein¬ richtung als Flatterventil ausgebildet, das bei sehr kleinen Werten der Druckdifferenz von nur einigen Mil- libar anspricht und zwischen seinen Funktionsstellungen zuverlässig umschaltbar ist.As a valve responding to the pressure difference between the recipient and the ejector, a check valve is suitable which, in a simple design of the vacuum pump device, is designed as a flap valve which responds to very small values of the pressure difference of only a few milibars and between them Function positions can be switched reliably.
Wenn, wie in bevorzugter Gestaltung der Vakuum-Pumpein¬ richtung vorgesehen, zwischen den Ausgang der Druck¬ luftquelle und den Druckluft-Eingang des Luftstrahl- Ejektors ein durch den Ausgangsdruck der Druckluftquel¬ le gesteuertes Überströmventil vorgesehen ist, das den Druckluftstrom zum Ejektor sperrt, wenn der Ausgangε- druck der Druckluftquelle abfällt und/oder einen ein¬ stellbar oder fest vorgegebenen Schwellenwert unter¬ schreitet, so ist es, wenn, wie in weiterer Ausgestal¬ tung der Vakuum-Pumpeinrichtung vorgesehen, der Luft¬ strom-Ausgang des Ejektors gegen die Umgebungsatmosphä¬ re mittels eines auf die Druckdifferenz zwischen dem Ejektor-Ausgang und der Umgebungsatmosphäre ansprechen- den Ventils absperrbar ist, das durch relativ höheren Druck am Ausgang des Ejektors als dem Umgebungsdruck in seine Offen-Stellung gesteuert ist und mit dem Unter¬ schreiten eines Mindestwertes dieser Druckdifferenz in seine Sperrstellung gelangt, ebenfalls möglich, bei ei¬ nem Ausfall der Druckluftquelle oder einem Druckabfall an deren Ausgang in dem Gehäuse der Schlauchquetschpum¬ pe noch ein Mindest-Vakuum - zumindest für eine begrenz¬ te Zeit - aufrechtzuerhaltenIf, as provided in a preferred configuration of the vacuum pump device, an overflow valve controlled by the outlet pressure of the compressed air source and blocking the compressed air flow to the ejector is provided between the outlet of the compressed air source and the compressed air inlet of the air jet ejector, If the output pressure of the compressed air source drops and / or falls below an adjustable or fixed predetermined threshold value, then, as is provided in a further embodiment of the vacuum pump device, the air flow output of the ejector is counter the ambient atmosphere by means of a response to the pressure difference between the ejector outlet and the ambient atmosphere. the valve can be shut off, which is controlled into its open position by a relatively higher pressure at the outlet of the ejector than the ambient pressure and which, when the pressure difference falls below a minimum value, reaches its locked position, also possible if the compressed air source fails or a pressure drop at the outlet thereof in the housing of the hose squeezing pump still maintain a minimum vacuum - at least for a limited time
Auch dieses druckempfindliche Ventil, das eine ausgangs- seitige Absperrung des Ejektors gegen den Umgebungs¬ druck, vermittelt, und damit, wenn der Ejektor eingangs- seitig durch ein Ansprechen des Überströmventils abge¬ sperrt ist, auch das Gehäuse der Schlauchquetschpumpe gegen die Umgebungsatmosphäre absperrt, kann als einfa¬ ches Flatterventil ausgebildet sein.This pressure-sensitive valve, too, which blocks the ejector on the outlet side from the ambient pressure, and thus, when the ejector is shut off on the inlet side by a response of the overflow valve, also shuts off the housing of the peristaltic pump from the ambient atmosphere. can be designed as a simple flap valve.
Mittels eines dem Druckluft-Eingang des Ejektors unmit¬ telbar vorgeschalteten 3/3-Wegeventils, das aus einer ersten Durchflußstellung, in welcher ein von der Druck- luftquelle zur Treibdüse des Ejektors führender Druck¬ luft-Strömungspfad freigegeben, der Treibdüsen-Anschlu߬ stutzen des Ejektors jedoch gegen die Umgebungsatmosphä¬ re abgesperrt ist, über eine SperrStellung, in welcher der Treibdüsen-Anschlußstutzen des Ejektors sowohl ge¬ gen den Druckluft-Ausgang der Druckluftquelle als auch gegen die Umgebungsatmosphäre abgesperrt ist, in eine zweite Durchflußstellung steuerbar ist, in welcher der Treibdüsen-Anschlußstutzen des Ejektors mit der Umge- bungsatmosphäre in Verbindung steht und gegen den Druck- luftausgang der Druckluftquelle abgesperrt ist, kann im Bedarfsfall das Gehäuse der Schlauchquetschpumpe über den Ejektor belüftet werden, wodurch im ausgeschalteten Zustand der Vakuum-Pumpeinrichtung das Gehäuse der Schlauchquetschpumpe belüftet ist.By means of a 3/3-way valve which is connected directly upstream of the compressed air inlet of the ejector and which supports the drive nozzle connection from a first flow position in which a compressed air flow path leading from the compressed air source to the ejection nozzle of the ejector of the ejector, however, is shut off from the surrounding atmosphere, via a blocking position, in which the driving nozzle connecting piece of the ejector is shut off both against the compressed air outlet of the compressed air source and against the surrounding atmosphere, can be controlled in a second flow position, in which the ejector's nozzle connection with the surrounding If the atmosphere is connected and is blocked against the compressed air outlet of the compressed air source, the housing of the peristaltic pump can be ventilated via the ejector if necessary, whereby the housing of the peristaltic pump is ventilated when the vacuum pump device is switched off.
Dies kann in hierzu alternativer Gestaltung der Vakuum- Pumpeinrichtung auch dadurch erreicht werden, daß ein dem Gehäuse der Schlauchquetschpumpe unmittelbar vorge¬ schaltetes 3/3-Wege-Ventil vorgesehen ist, das aus ei¬ ner ersten Durchflußstellung, in welcher das den Rezi- pienten bildende Gehäuse der Schlauchquetschpumpe mit der Unterdruckkammer des Ejektors verbunden und gleich¬ zeitig gegen die Umgebungsatmosphäre abgesperrt ist, über eine Sperrstellung, in welcher sowohl der Rezi¬ pient als auch die Unterdruckkammer des Ejektors gegen die Umgebungsatmosphäre abgesperrt sind, in eine zweite Durchflußstellung - eine Belüftungsstellung - umschalt¬ bar ist, in welcher der Rezipient mit der Umgebungsat¬ mosphäre in kommunizierender Verbindung steht, jedoch gegen die Unterdruckkammer des Ejektors abgesperrt ist, die bei dieser Gestaltung über die Fangdüse mit der Um- gebungsatmospähre in kommunizierender Verbindung bleibt.In an alternative configuration of the vacuum pumping device, this can also be achieved by providing a 3/3-way valve which is directly upstream of the housing of the peristaltic pump and which has a first flow position in which the recipient Forming housing of the peristaltic pump connected to the vacuum chamber of the ejector and at the same time is locked against the ambient atmosphere, via a locking position in which both the recipient and the vacuum chamber of the ejector are locked against the ambient atmosphere, in a second flow position - a ventilation position is switchable, in which the recipient is in communicating connection with the surrounding atmosphere, but is blocked off from the vacuum chamber of the ejector, which in this configuration remains in communicating connection with the surrounding atmosphere via the trap nozzle.
Derartige 3/3-Wege-Ventile können als einfache, von Hand betätigbare 3-Wege-Hähne mit L-Küken ausgebildet sein. Ein geräuscharmer Betrieb der Vakuum-Pump-Einrichtung kann auf einfache Weise mittels eines deren Ejektor nachgeschalteten Schalldämpfers üblicher Bauart erzielt werden.Such 3/3-way valves can be designed as simple, manually operable 3-way valves with L-plug. Low-noise operation of the vacuum pump device can be achieved in a simple manner by means of a conventional type of silencer connected downstream of its ejector.
Weitere Einzelheiten und Merkmale der Erfindung ergeben sich aus der nachfolgenden Beschreibung zweier Ausfüh¬ rungsbeispiele anhand der Zeichnung. Es zeigenFurther details and features of the invention result from the following description of two exemplary embodiments with reference to the drawing. Show it
Fig. 1 ein Blockschaltbild einer Vakuum-Pumpeinrich¬ tung mit einem Luftstrahl-Ejektor als Vakuum- Pumpaggregat und einem zwischen dieses und den Rezipienten geschalteten Absperrventil und1 shows a block diagram of a vacuum pump device with an air jet ejector as a vacuum pump unit and a shut-off valve and connected between it and the recipient
Fig. 2 eine Vakuum-Pumpeinrichtung mit einem Luft¬ strahl-Ejektor als Vakuum-Pumpaggregat und ei¬ nem diesem nachgeschalteten Absperrventil, in einer der Fig. 1 entsprechenden Blockschalt¬ bilddarstellung.FIG. 2 shows a vacuum pump device with an air jet ejector as a vacuum pump unit and a shut-off valve connected downstream thereof, in a block diagram representation corresponding to FIG. 1.
Die in der Fig. 1 insgesamt mit 10 bezeichnete Vakuum- Pumpeinrichtung dient dazu, im Gehäuse 11 einer als Schlauchquetschpumpe ausgebildeten, insgesamt mit 12 bezeichnete Dickstoff-Förderpumpe einen Unterdruck zu erzeugen, durch den die Entspannung des Pumpenschlau¬ ches 13 beidseits der im Pumpbetrieb über seine Länge hinweglaufenden Quetschstelle gefördert und dadurch das Nachströmen von Fördergut in die Pumpe 12 erleichtert werden soll. In dem der Grundform nach trommeiförmigen Gehäuse 12 ist um dessen zentrale Achse 14 drehbar ein im wesent¬ lichen kreisscheibenförmiger Rotor 16 gelagert, der z.B. über den Nebenabtrieb des Motors eines nicht dar¬ gestellten Baufahrzeuges rotatorisch antreibbar ist, auf dem die Schlauchquetschpumpe zusammen mit weiteren Einrichtungen, z.B. einem Betonmischer und/oder einem Verteilermast für Beton montiert ist. An dem Rotor sind zwei Quetschrollen frei drehbar um zu der zentralen Achse 14 der Pumpe 12 parallele Drehachse 19 und 21 ge¬ lagert, die in gleichem Abstand von der zentralen Achse 14 in einem azimutalen Abstand von 180° an dem Rotor angeordnet sind. Innerhalb des Gehäuses 11 der Pumpe 12 ist eine sich zwischen dem Pumpeneingang 22 und dem Pumpenausgang 23 erstreckende, den Rotor auf einem 180"-Umfangsbereich koaxial umgebende Stützwand 24 an¬ geordnet, die zwischen den Seitenwänden des Pumpenge¬ häuses 11 befestigt ist und die Form eines halben Zy¬ lindermantels hat. Im Förderbetrieb der Pumpe, in dem sich deren Rotor 16 in Richtung des Pfeils 26, bei der gewählten Darstellung im Uhrzeigersinn, dreht, wird der Pumpenschlauch zwischen der Stützwand 24 und den beiden Quetschrollen 17 und 18, die alternierend an der Innen¬ seite der Stützwand an dem Schlauch 13 angreifen, zu¬ sammengequetscht, wobei die Quetschstelle 27 vom Pum¬ peneingang 22 über den inneren Umfangsbereich der Stütz¬ wand 24 zum Pumpenausgang 23 wandert und dadurch das Fördergut durch den Pumpenschlauch 13 gedrängt wird.The vacuum pump device, designated overall by 10 in FIG. 1, serves to generate a negative pressure in the housing 11 of a thick matter feed pump designed as a peristaltic pump, overall designated 12, by means of which the expansion of the pump hose 13 on both sides of the pumping operation promoted its length extending pinch point and thereby the flow of material to be pumped into the pump 12 is to be facilitated. In the basic shape of the drum-shaped housing 12, an essentially circular disk-shaped rotor 16 is rotatably mounted about its central axis 14 and can be rotated, for example via the power take-off of the engine of a construction vehicle (not shown), on which the peristaltic pump together with other devices , for example a concrete mixer and / or a placing boom for concrete is mounted. Two pinch rollers are freely rotatably mounted on the rotor about axes of rotation 19 and 21 which are parallel to the central axis 14 of the pump 12 and are arranged at the same distance from the central axis 14 at an azimuthal distance of 180 ° on the rotor. Arranged within the housing 11 of the pump 12 is a support wall 24, which extends between the pump inlet 22 and the pump outlet 23 and coaxially surrounds the rotor on a 180 "circumferential area and is fixed between the side walls of the pump housing 11 and the shape In the delivery mode of the pump, in which the rotor 16 rotates in the direction of arrow 26, in the selected representation clockwise, the pump hose between the support wall 24 and the two pinch rollers 17 and 18 is alternating Grip the tube 13 on the inside of the support wall, squeezed together, the pinch point 27 migrating from the pump inlet 22 over the inner circumferential region of the support wall 24 to the pump outlet 23 and the material to be conveyed thereby being pushed through the pump hose 13.
Als Vakuum-Pumpaggregat, mittels dessen das Gehäuse 11 der Schlauchquetschpumpe 12 partiell, d.h. bis auf ei¬ nen Absolutwert des Druckes von etwa 0,2 bar evakuier¬ bar ist, ist ein insgesamt mit 28 bezeichneter Luft- strahl-Ejektor vorgesehen, der eine von einem Druck- luftstrahl, der durch einen Strömungspfeil 31 reprä¬ sentiert ist, als Treibstrahl durchströmte, eingangs- seitige Treibdüse 32 und eine austrittsseitige Fangdüse 33 sowie ein die in Strömungsrichtung des Treibstrahls 31 gesehen, einander benachbarten Mündungen 34 und 36 der Treibdüse 32 bzw. der Fangdüse 33 enthaltendes, eine Unterdruckkammer 37 begrenzendes Gehäuse 29 mit einem Saug-Anschlußstutzen 38. umfaßt, an den über ein Eingangs-Rückschlagventil 39 und einen 3-Wege-Hahn 41 die durch das Gehäuse 11 der Schlauchquetschpumpe 12 begrenzte Kammer 42 der Schlauchquetschpumpe 12 als Rezipient anschließbar ist.As a vacuum pump unit, by means of which the housing 11 of the peristaltic pump 12 is partially, that is to say evacuatable to an absolute value of the pressure of approximately 0.2 bar, an air jet ejector, designated as a whole by 28, is provided, which is one of a compressed air jet passing through a flow arrow 31 is represented, an inlet-side driving nozzle 32 through which a driving jet flows and an exit-side catching nozzle 33, and an orifice 34 and 36 of the driving nozzle 32 or the catching nozzle 33, which, seen in the direction of flow of the driving jet 31, contains one another and delimits a vacuum chamber 37 Housing 29 with a suction connector 38., to which via an inlet check valve 39 and a 3-way valve 41 the chamber 42 of the peristaltic pump 12 delimited by the housing 11 of the peristaltic pump 12 can be connected as a recipient.
Der im Evakuierungsbetrieb des Ejektors 28 und der an seinen Saugstutzen 38 angeschlossenen Pumpenkammer 42 durch den Ejektor 28 geleitete Druckluftstrom wird von einem Kompressor 43 erzeugt, der als bordeigenes Aggre¬ gat des Fahrzeuges vorgesehen ist und auch für die Druckluftversorgung der Druckluft-Bremsanlage des Fahr¬ zeuges dient. Dieser Kompressor 43 ist vom Motor des Fahrzeuges angetrieben, während die Schlauchquetschpum¬ pe 12 über einen - nicht dargestellten - ein- und aus¬ schaltbaren Nebenabtrieb des Antriebsaggregates des Fahrzeuges antreibbar ist.The compressed air flow passed through the ejector 28 in the evacuation mode of the ejector 28 and the pump chamber 42 connected to its suction port 38 is generated by a compressor 43 which is provided as an on-board unit of the vehicle and also for the compressed air supply to the compressed air braking system of the vehicle Stuff serves. This compressor 43 is driven by the engine of the vehicle, while the peristaltic pump 12 can be driven via a power take-off of the drive unit of the vehicle that can be switched on and off, not shown.
Zwischen den für die Druckluftversorgung des Ejektors vorgesehenen Druckluftausgang 44 des Kompressors 43 und den durch die äußere Mündungsöffnung 46 der Treibdüse 32 des Ejektors gebildeten Drucklufteingang desselben ist ein druckgesteuertes Überströmventil 47 geschaltet, das den Durchgang eines Druckluftstromes vom Druckluft- ausgang 44 des Kompressors 43 zum Eingang 46 des Ejek¬ tors 28 freigibt, so lange der Ausgangsdruck des Kom¬ pressors größer ist als ein definierter Schwellenwert von z.B. 8 bar, diesen Strömungspfad jedoch absperrt, sobald der Ausgangsdruck des Kompressors 43 unter die¬ sen Schwellenwert absinkt. Der an der inneren Mündungs¬ öffnung 34 der Treibdüse, die, in Strömungsrichtung des Treibstrahls 31 gesehen, einen sich stetig verjüngenden Strömungsquerschnitt hat, mit hoher Geschwindigkeit austretende Treibluftstrahl 31 reißt in der Unterdruck¬ kammer 37 des Ejektors 28 befindliche Luft in die Fang¬ düse 33 des Ejektors 28 hinein mit, die zusammen mit dem Treibluftstrom 31 zu dem durch die äußere Mündungs¬ öffnung 48 der Fangdüse gebildeten Druckluftausgang des Ejektors 28 transportiert wird, wo, bedingt durch eine in Strömungsrichtung sich erweiterende Gestaltung der Fangdüse die Geschwindigkeit des austretenden Luftstro¬ mes deutlich reduziert ist. Zwischen ihrer inneren Mün¬ dungsöffnung 36, deren Querschnitt deutlich größer ist als die benachbarte innere Mündungsöffnung 34 der Treib¬ düse 32 und ihrer äußeren Mündungsöffnugn 48 hat die Fangdüse 33 einen sich zunächst verjüngenden und danach sich wieder zur äußeren Mündungsöffnung 48 hin stetig erweiterenden Strömungsquerschnitt, der im Bereich der äußeren Mündungsöffnung 48 deutlich größer ist als der lichte Querschnitt der kompressorseitigen, äußeren Mün¬ dungsöffnung 46 der Treibdüse, um eine deutliche Beru¬ higung des am Ausgang 48 des Ejektors 28 austretenden Luftstromes zu erzielen, der zur Reduzierung der Be¬ triebsgeräusche noch durch einen dem Ejektor 28 nachge¬ schalteten Schalldämpfer 49 geleitet wird.Between those for the compressed air supply to the ejector provided compressed air outlet 44 of the compressor 43 and the compressed air inlet formed by the outer mouth opening 46 of the driving nozzle 32 of the ejector, a pressure-controlled overflow valve 47 is connected, which releases the passage of a compressed air flow from the compressed air outlet 44 of the compressor 43 to the inlet 46 of the ejector 28 as long as the output pressure of the compressor is greater than a defined threshold value of, for example, 8 bar, but blocks this flow path as soon as the output pressure of the compressor 43 drops below this threshold value. The propellant air jet 31 emerging at high speed at the inner mouth opening 34 of the propellant nozzle, which, viewed in the direction of flow of the propellant jet 31, has a continuously tapering flow cross section, tears air in the vacuum chamber 37 of the ejector 28 into the catch nozzle 33 of the ejector 28, which is transported together with the propellant air flow 31 to the compressed air outlet of the ejector 28 formed by the outer mouth opening 48 of the trap nozzle, where, due to a design of the trap nozzle which widens in the direction of flow, the speed of the emerging air flow mes is significantly reduced. Between its inner mouth opening 36, the cross-section of which is significantly larger than the adjacent inner mouth opening 34 of the driving nozzle 32 and its outer mouth opening 48, the catch nozzle 33 has a flow cross section which initially tapered and then widened again towards the outer mouth opening 48, which is significantly larger than that in the area of the outer opening 48 clear cross-section of the compressor-side, outer opening 46 of the driving nozzle in order to achieve a clear calming of the air flow exiting at the outlet 48 of the ejector 28, which, in order to reduce the operating noise, is also passed through a silencer 49 connected downstream of the ejector 28 becomes.
Das beim Ausführungsbeispiel gemäß Fig. 1 zwischen dem Ansaugstutzen 38 des Ejektors 28 und den zweckmäßiger¬ weise am Gehäuse 11 der Schlauchquetschpumpe 12 ange¬ ordneten 3-Wege-Hahn 41 vorgesehene Rückschlagventil 39 ist als Flatterventil ausgebildet, das bei sehr gerin¬ gen Druckunterschieden zwischen der Unterdruckkammer 37 des Ejektors und der den Rezipienten bildenden Kammer 42 des Quetschpumpengehäuses 11 in seine Offen- bzw. seine Sperrstellung übergeht, wobei dieses Flatterven¬ til 39 durch geringfügig höheren Druck in der Unter¬ druckkammer 37 des Ejektors 28 als im Rezipienten 42 in seiner Sperrstellung gehalten ist und durch relativ hö¬ heren Druck in der Kammer 42 des Pumpengehäuses 11 als in der Unterdruckkammer 37 des Ejektors 28 in seine Of- fen-Stellung geschaltet ist.The check valve 39 provided between the intake port 38 of the ejector 28 and the 3-way valve 41, which is expediently arranged on the housing 11 of the peristaltic pump 12, is designed as a flap valve which, at very low pressure differences, between the check valve 39 the vacuum chamber 37 of the ejector and the chamber 42 of the squeeze pump housing 11 forming the recipient transitions into its open or locked position, this flutter valve 39 being caused by slightly higher pressure in the vacuum chamber 37 of the ejector 28 than in the recipient 42 in its Locked position is maintained and is switched to its open position by relatively higher pressure in the chamber 42 of the pump housing 11 than in the vacuum chamber 37 of the ejector 28.
Durch das bei einem Aussetzen des Treibluftstrahles und der damit verbundenen Druckerhöhung in der Unterdruck¬ kammer 37 des Ejektors in seine Sperrstellung gelangen¬ de Flatterventil 39 wird, sofern sich gleichzeitig der 3-Wege-Hahn in seiner - dargestellten - Evakuierungs¬ stellung befindet, der Unterdruck im angeschlossenen Rezipienten aufrechterhalten. Der 3-Wege-Hahn 41 ist beim dargestellten Ausführungs- beispiel als Hahn mit drehbarem L-Küken ausgebildet, der die Funktion eines 3/3-Wege-Ventils vermittelt, das aus einer ersten - dargestellten - Durchflußstellung, in welcher das Pumpengehäuse 11 evakuierbar ist, über eine Sperrstellung, in welcher das Pumpengehäuse 11 so¬ wohl gegen die Umgebungsatmosphäre als auch gegen den Ejektor 28 abgesperrt ist, in eine zweite Durchflu߬ stellung, die Belüftungsstellung, umschaltbar ist, in welcher die evakuierbare Kammer 42 der Schlauchquetsch¬ pumpe 12 über den Hahn 41 unmittelbar mit der Umge¬ bungsatmosphäre in Verbindung steht.The flap valve 39, which comes into its blocking position when the propellant air jet is exposed and the pressure increase in the vacuum chamber 37 of the ejector connected with it, provided that the 3-way valve is in its - shown - evacuation position at the same time Maintain negative pressure in the connected recipient. In the exemplary embodiment shown, the 3-way valve 41 is designed as a valve with a rotatable L-plug, which conveys the function of a 3/3-way valve which, from a first - shown - flow position, in which the pump housing 11 can be evacuated can be switched to a second flow position, the ventilation position, in which the evacuable chamber 42 of the peristaltic pump 12 can be switched via a blocking position, in which the pump housing 11 is blocked off both from the ambient atmosphere and from the ejector 28 is connected directly to the surrounding atmosphere via the tap 41.
Für das nunmehr anhand der Fig. 2 zu erläuternde weite¬ re Ausführungsbeispiel einer zur Evakuierung der den Rotor 16 sowie den Förderschlauch 13 einer Schlauch¬ quetschpumpe aufnehmenden Gehäusekammer 42 geeigneten Vakuum-Pumpeinrichtung 10*' wird vorausgesetzt, daß de¬ ren Funktionselemente - Kompressor 43, Überströmventil 47, 3-Wege-Hahn 41, Ejektor 28, Flatterventil 39 und Schalldämpfer 49 mit den entsprechend bezeichneten Funktionselementen des Ausführungsbeispiels gemäß Fig. : baugleich sind.For the further exemplary embodiment to be explained now with reference to FIG. 2, a vacuum pump device 10 * 'suitable for evacuating the housing chamber 42 accommodating the rotor 16 and the delivery hose 13 of a peristaltic pump is assumed that its functional elements - compressor 43 , Overflow valve 47, 3-way valve 41, ejector 28, flutter valve 39 and silencer 49 with the correspondingly designated functional elements of the embodiment shown in FIG.
Im Unterschied zu diesem ist beim Ausführungsbeispiel gemäß Fig. 2 der Ansaugstutzen 38 des Ejektors 28 un¬ mittelbar an die evakuierbare Kammer 42 des Gehäuses 11 der Schlauchquetschpumpe 12 angeschlossen; der 3-Wege- Hahn 41 ist zwischen das Überströmventil 47 und den Ejektor 28 geschaltet, und das Flatterventil 39, das hier als Ausgangs-Rückschlagventil des Ejektors 28 aus¬ genutzt ist, ist zwischen den Ejektor 28 und den Schalldämpfer 49 geschaltet.In contrast to this, in the exemplary embodiment according to FIG. 2 the suction nozzle 38 of the ejector 28 is connected directly to the evacuable chamber 42 of the housing 11 of the peristaltic pump 12; the 3-way valve 41 is between the overflow valve 47 and Ejector 28 is switched, and the flutter valve 39, which is used here as an output check valve of the ejector 28, is connected between the ejector 28 and the silencer 49.
Die beiden Ausführungsbeispiele sind funktionsäquiva¬ lent, wobei jeweils das Flatterventil 39, wenn das Überströmventil 47 in seine Sperrstellung gelangt, z.B. weil der Ausgangsdruck des Kompressors 43 unterhalb des Druck-Schwellenwertes abgesunken ist, ab welchem das Überströmventil 47 öffnet, durch seine einseitige Be¬ aufschlagung mit dem Atmosphärendruck ebenfalls in sei¬ ne Sperrstellung gelangt und dadurch den Rezipienten 42 gegen die Umgebungsatmosphäre absperrt, so daß ein in diesem vorhandener Unterdruck erhalten bleibt. Die Be¬ lüftung des Rezipienten 42 erfolgt beim Ausführungsbei- spiel gemäß Fig. 2 über den 3-Wege-Hahn 41 und die Treibdüse 32 des Ejektors 28, die - bei geschlossenem Förderventil 39 - mittels des 3-Wege-Hahns mit der Um¬ gebungsatmosphäre in Verbindung bringbar ist.The two exemplary embodiments are functionally equivalent, the flutter valve 39 in each case when the overflow valve 47 reaches its blocking position, e.g. because the outlet pressure of the compressor 43 has dropped below the pressure threshold value above which the overflow valve 47 opens, also reaches its blocking position due to its one-sided application with the atmospheric pressure and thereby blocks the recipient 42 from the ambient atmosphere, so that a remains in this existing negative pressure. In the exemplary embodiment according to FIG. 2, the recipient 42 is ventilated via the 3-way valve 41 and the drive nozzle 32 of the ejector 28, which - with the delivery valve 39 closed - by means of the 3-way valve with the um¬ atmosphere can be connected.
In einer typischen Auslegung der Vakuum-Pumpeinrichtun¬ gen 10,10' gemäß den Fig. 1 und 2 beträgt der Ausgangs¬ druck des Kompressors 43 zwischen 6 und 8 bar, wobei der als Treibstrahl des Ejektors 28 ausgenutzte Druck- luftstrom, bezogen auf Normalbedingungen (Druck 1 bar und Lufttemperatur um 20°) einen Betrag von 200 1/min hat. Die bei dieser Auslegung der Vakuum-Pumpeinrich¬ tungen 10,10' am Beginn des Evakuierungsbetriebes aus dem Rezipienten 42 förderbare Luftmenge beträgt dann ca. 150 1/min, wobei sich im stationären Betriebszu¬ stand der Pumpeinrichtung 10,10' im Rezipienten 42 ein Unterdruck einstellt, der einen Absolutwert von ca. 0,2 bis 0,3 bar hat.In a typical design of the vacuum pumping devices 10, 10 'according to FIGS. 1 and 2, the outlet pressure of the compressor 43 is between 6 and 8 bar, the compressed air flow used as the jet of the ejector 28, based on normal conditions (Pressure 1 bar and air temperature around 20 °) has an amount of 200 1 / min. The amount of air that can be conveyed from the recipient 42 in this configuration of the vacuum pumping devices 10, 10 'at the beginning of the evacuation operation is then approx. 150 1 / min, in the stationary operating state of the pump device 10, 10 'in the recipient 42 a negative pressure which has an absolute value of approx. 0.2 to 0.3 bar.
Zusammenfassend ist folgendes festzustellen: Bei einer Vakuum-Pumpeinrichtung für die Evakuierung des Gehäuses 17 einer als Betonförderpumpe, benutzbaren Schlauch¬ quetschpumpe 12, die auf einem Straßenfahrzeug mit ei¬ ner Druckluftbremsanlage installiert ist, ist das Va¬ kuum-Pumpaggregat 28 an dessen Saugseite das Gehäuse 11 der Schlauchquetschpumpe 12 als Rezipient angeschlossen ist, als ein nach dem Prinzip der DampfStrahlpumpe ar¬ beitender Ejektor ausgebildet, dessen Treibluftstrahl von der mittels des Kompressors 43 der Fahrzeug-Brems¬ anlage erzeugten Druckluft abzweigbar ist. In summary, the following can be stated: in the case of a vacuum pump device for evacuating the housing 17 of a hose squeeze pump 12 which can be used as a concrete delivery pump and which is installed on a road vehicle with a compressed air brake system, the vacuum pump unit 28 on its suction side is that Housing 11 of the peristaltic pump 12 is connected as a recipient, designed as an ejector working according to the principle of the steam jet pump, the driving air jet of which can be branched off from the compressed air generated by means of the compressor 43 of the vehicle brake system.

Claims

Patentansprüche Claims
1. Vakuum-Pumpeinrichtung für die Evakuierung des Ge¬ häuses einer als Dickstoff-Förderpumpe, insbesonde¬ re Betonförderpumpe, benutzbaren Schlauchquetsch¬ pumpe, die auf einem Straßenfahrzeug installiert ist, das sowohl mit einem zur Erzeugung von Druck¬ luft für den Betrieb bordeigener Einrichtungen, z.B. einer Druckluft-Bremsanlage des Fahrzeuges und/oder weiterer auf dem Fahrzeug mitführbarer oder auf diesem installierter Geräte benötigten Kompressor als auch mit einem Vakuum-Pumpaggregat ausgerüstet ist, an dessen Saugseite das Gehäuse der Schlauchquetschpumpe als Rezipient angeschlos¬ sen ist, dadurch gekennzeichnet, daß das Vakuum- Pumpaggregat (28) als ein nach dem Prinzip der Strahlpumpe arbeitender Ejektor ausgebildet ist, dessen Treibgasstrahl von der mittels des Kompres¬ sors (43) erzeugten Druckluft abzweigbar ist.1. Vacuum pump device for the evacuation of the housing of a hose squeeze pump which can be used as a thick matter feed pump, in particular a concrete feed pump, and which is installed on a road vehicle, both with a device for generating compressed air for the operation of on-board devices , e.g. a compressed air brake system of the vehicle and / or other compressor that can be carried on the vehicle or installed on this equipment, as well as a vacuum pump unit, on the suction side of which the housing of the peristaltic pump is connected as a recipient, characterized in that Vacuum pump unit (28) is designed as an ejector working on the principle of the jet pump, the propellant gas jet of which can be branched off from the compressed air generated by the compressor (43).
2. Vakuum-Pumpeinrichtung nach Anspruch 1, dadurch ge¬ kennzeichnet, daß zwischen den Ansaugstutzen (38) des Luftstrahl-Ejektorε (28) und das Gehäuse (11) der Schlauchquetschpumpe (12) ein auf den im Rezi¬ pienten herrschenden Unterdruck ansprechendes Ven¬ til (39) geschaltet ist, das durch relativ höheren Druck im Pumpengehäuεe (11) als in der Unterdruck¬ kammer (37) des Ejektors (28) in seine Offen-Stel- lung und durch relativ höheren Druck in der Unter¬ druckkammer (37) des Ejektors (28) in seine Sperr- Stellung steuerbar ist.2. Vacuum pump device according to claim 1, characterized ge indicates that between the intake (38) of the air jet ejector (28) and the housing (11) of the peristaltic pump (12) a responsive to the vacuum prevailing in the Rezi¬ pient Ven ¬ valve (39) is switched to its open position due to relatively higher pressure in the pump housing (11) than in the vacuum chamber (37) of the ejector (28) and by relatively higher pressure in the vacuum chamber ( 37) of the ejector (28) into its blocking Position is controllable.
3. Vakuum-Pumpeinrichtung nach Anspruch 2, dadurch ge¬ kennzeichnet, daß das auf den Unterdruck im Rezi¬ pienten (11,42) ansprechende Ventil (39) als Flat¬ terventil ausgebildet ist.3. Vacuum pump device according to claim 2, characterized in that the valve (39) responsive to the negative pressure in the receiver (11, 42) is designed as a flat valve.
4. Vakuum-Pumpeinrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß zwischen den Ausgang (44) der Druckluftquelle (43) und den Druck¬ luft-Eingang (46) des Luftstrahl-Ejektors (28) ein durch den Ausgangsdruck der Druckluftquelle (43) gesteuertes Überströmventil (47) vorgesehen ist, das ab einem Mindestausgangsdruck der Druckluftquel¬ le in eine einem maximalen Strömungsquerschnitt entsprechende Offen-Stellung gesteuert ist und in seine Sperrstellung übergeht, wenn der Ausgangs¬ druck der Druckluftquelle (43) unter einen ein¬ stellbar oder fest vorgegebenen Schwellenwert ab¬ fällt.4. Vacuum pump device according to one of claims 1 to 3, characterized in that between the outlet (44) of the compressed air source (43) and the Druck¬ air inlet (46) of the air jet ejector (28) by the outlet pressure of the Compressed air source (43) controlled overflow valve (47) is provided, which is controlled from a minimum outlet pressure of the compressed air source into an open position corresponding to a maximum flow cross section and changes into its blocking position when the outlet pressure of the compressed air source (43) is below one ¬ adjustable or fixed predetermined threshold value drops.
5. Vakuum-Pumpeinrichtung nach Anspruch 1 oder nach Anspruch 1 in Kombination mit Anspruch 4, dadurch gekennzeichnet, daß der Luftstrom-Ausgang (48) des Luftstrahl-Ejektors (28) gegen die Umgebungsatmos¬ phäre mittels eines auf die Druckdifferenz zwischen Ejektor-Ausgang (48) und Umgebungsatmosphäre an¬ sprechenden Ventils (39) absperrbar ist, das durch relativ höheren Druck am Ausgang des Ejektors (28) als dem Umgebungsdruck in seine Offen-Stellung und durch höheren Umgebungsdruck als am Ausgang (48) des Ejektors (28) in seine Sperrstellung gelangt.5. Vacuum pumping device according to claim 1 or claim 1 in combination with claim 4, characterized in that the air flow output (48) of the air jet ejector (28) against the surrounding atmosphere by means of a pressure difference between the ejector output (48) and ambient atmosphere corresponding valve (39) which can be shut off by the relatively higher pressure at the outlet of the ejector (28) than the ambient pressure in its open position and reaches its blocking position due to a higher ambient pressure than at the outlet (48) of the ejector (28).
6. Vakuum-Pumpeinrichtung nach Anspruch 5, dadurch ge¬ kennzeichnet, daß das auf die Druckdifferenz zwi¬ schen dem Umgebungsdruck und dem in der Unterdruck¬ kammer (37) des Ejektors (28) herrschenden Druck ansprechende Ventil (39) als Flatterventil ausge¬ bildet ist.6. Vacuum pumping device according to claim 5, characterized in that the pressure difference valve (39) which acts on the pressure difference between the ambient pressure and the pressure prevailing in the vacuum chamber (37) of the ejector (28) acts as a flap valve forms is.
7. Vakuum-Pumpeinrichtung nach Anspruch 5 oder An¬ spruch 6, dadurch gekennzeichnet, daß ein dem Druckluft-Eingang (46) des Ejektors (28) unmittel¬ bar vorgeschaltetes 3/3-Wege-Ventil (41) vorgesehen ist, das aus einer ersten Durchflußstellung, in welcher ein von der Druckluftquelle (43) zur Treib¬ düse (32) des Ejektors (28) führender Druckluft- Strömungspfad freigegeben, der Treibdüsen-Anschlu߬ stutzen des Ejektors (28) jedoch gegen die Umge¬ bungsatmosphäre abgesperrt ist, über eine Sperr¬ stellung, in welcher der Treibdüsen-Anschlußstutzen sowohl gegen den Druckluftausgang (44) der Druck- luftquelle (43) als auch gegen die Umgebungsatmoε- phäre abgesperrt ist, in eine zweite Durchflußstel¬ lung steuerbar ist, in welcher der Treibdüsen-An¬ schlußstutzen mit der Umgebungsatmosphäre in Ver¬ bindung steht und gegen den Druckluftausgang (44) der Druckluftquelle (43) abgesperrt ist.7. Vacuum pumping device according to claim 5 or claim 6, characterized in that a compressed air inlet (46) of the ejector (28) immediately upstream 3/3-way valve (41) is provided, which consists of a first flow position, in which a compressed air flow path leading from the compressed air source (43) to the driving nozzle (32) of the ejector (28) is released, but the driving nozzle connecting piece of the ejector (28) is blocked off from the ambient atmosphere , via a blocking position, in which the driving nozzle connecting piece is blocked both against the compressed air outlet (44) of the compressed air source (43) and against the ambient atmosphere, can be controlled into a second flow position, in which the driving nozzle - Connection piece is connected to the ambient atmosphere and is shut off from the compressed air outlet (44) of the compressed air source (43).
8. Vakuum-Pumpeinrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß ein dem Gehäuse (11) der Schlauchquetschpumpe (12) unmittelbar vor¬ geschaltetes 3/3-Wegeventil (41) vorgesehen ist, daε auε einer ersten Durchflußstellung, in welcher der Rezipient (42) mit der Unterdruckkammer (37) des Ejektors (28) verbunden und gleichzeitig gegen die Umgebungsatmoεphäre abgesperrt ist, über eine Sperrstellung, in welcher sowohl der Rezipient (42) als auch die Unterdruckkammer (37) des Ejektors (28) gegen die Umgebungsatmosphäre abgesperrt sind, in eine zweite Durchflußstellung - eine Belüftungs¬ stellung - umschaltbar ist, in welcher der Rezi¬ pient (42) mit der Umgebungsatmosphäre in kommuni¬ zierender Verbindung steht.8. Vacuum pump device according to one of claims 1 to 4, characterized in that a 3/3-way valve (41) is provided upstream of the housing (11) of the peristaltic pump (12), ie a first flow position, in which the recipient (42) with the vacuum chamber ( 37) of the ejector (28) is connected and at the same time blocked off from the surrounding atmosphere, via a blocking position in which both the recipient (42) and the vacuum chamber (37) of the ejector (28) are blocked off from the surrounding atmosphere, into a second flow position - A ventilation position - can be switched, in which the recipient (42) communicates with the ambient atmosphere.
9. Vakuum-Pumpeinrichtung nach Anspruch 7 oder 8, da¬ durch gekennzeichnet, daß das 3/3-Wege-Ventil (41) als ein vorzugsweise von Hand betätigbarer 3-Wege- Hahn mit L-Küken ausgebildet ist.9. Vacuum pump device according to claim 7 or 8, characterized in that the 3/3-way valve (41) is designed as a preferably manually operable 3-way valve with L-plug.
10. Vakuum-Pumpeinrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß dem Ejektor (28) ein Schalldämpfer (49) nachgeεchaltet ist. 10. Vacuum pump device according to one of claims 1 to 9, characterized in that the ejector (28) is followed by a silencer (49).
EP94903814A 1993-02-05 1993-12-17 Vacuum pump device Expired - Lifetime EP0682751B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4303319A DE4303319A1 (en) 1993-02-05 1993-02-05 Vacuum pumping device
DE4303319 1993-02-05
PCT/EP1993/003589 WO1994018453A1 (en) 1993-02-05 1993-12-17 Vacuum pump device

Publications (2)

Publication Number Publication Date
EP0682751A1 true EP0682751A1 (en) 1995-11-22
EP0682751B1 EP0682751B1 (en) 1997-08-06

Family

ID=6479711

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94903814A Expired - Lifetime EP0682751B1 (en) 1993-02-05 1993-12-17 Vacuum pump device

Country Status (6)

Country Link
EP (1) EP0682751B1 (en)
JP (1) JPH08506398A (en)
KR (1) KR100307938B1 (en)
DE (2) DE4303319A1 (en)
ES (1) ES2107803T3 (en)
WO (1) WO1994018453A1 (en)

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US6857277B2 (en) 2000-09-01 2005-02-22 Katsuzo Somura Process and equipment for manufacturing clear, solid ice of spherical and other shapes
DE20205068U1 (en) 2002-03-30 2002-08-29 Festo Ag & Co Compressed air muffler
DE10357320A1 (en) * 2003-12-05 2005-06-30 Crane Process Flow Technologies Gmbh Peristaltic pump with vacuum generation device
JP4854302B2 (en) * 2004-02-17 2012-01-18 パナソニック株式会社 Combustible refrigerant, refrigerating machine oil processing apparatus and processing method
NL2000167C2 (en) * 2006-07-28 2008-01-29 Bredel Hose Pumps B V Peristaltic pump.
JP4821926B2 (en) * 2010-11-29 2011-11-24 ソニー株式会社 Signal processing apparatus and signal processing method
JP2015132180A (en) * 2014-01-10 2015-07-23 東亜工業株式会社 tube pump
DE102017203877A1 (en) * 2017-03-09 2018-09-13 Polytec Plastics Germany Gmbh & Co. Kg Switched suction jet pump

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Also Published As

Publication number Publication date
ES2107803T3 (en) 1997-12-01
DE4303319A1 (en) 1994-08-11
EP0682751B1 (en) 1997-08-06
KR960700413A (en) 1996-01-20
WO1994018453A1 (en) 1994-08-18
DE59307092D1 (en) 1997-09-11
KR100307938B1 (en) 2001-11-30
JPH08506398A (en) 1996-07-09

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