NO900315L

NO900315L - PROCEDURE FOR AA GENERATING VACUUM IN A CLOSED CONTAINER AND DEVICE FOR THIS.

Info

Publication number: NO900315L
Application number: NO90900315A
Authority: NO
Inventors: Mogens Jensen-Plambech
Original assignee: Vacex Ab
Priority date: 1988-05-24
Filing date: 1990-01-23
Publication date: 1990-01-23
Also published as: NO900315D0

Description

Foreliggende oppfinnelse vedrører en fremgangsmåte og en innretning for å generere vakuum i en lukket beholder. The present invention relates to a method and a device for generating vacuum in a closed container.

Det foreligger behov for undertrykk i flere områder, for eksempel innenfor fremstillingsindustrien, der en kontrol-lerbar sugeeffekt er vesentlig ved kraftoverføringen eller matrialhåndteringen. Eksempel på slike områder er hydrauliske utrustninger for hvilke det finnes store behov av trykk og undertrykk, for eksempel i en med stempel forsynt sylinder, i hvilken trykket fører stemplet framover og undertrykket drar den tilbake. Et annet eksempel er belegning av faste legemer med en mantel av elastisk materiale. There is a need for negative pressure in several areas, for example within the manufacturing industry, where a controllable suction effect is essential for power transmission or material handling. Examples of such areas are hydraulic equipment for which there is a great need for pressure and negative pressure, for example in a cylinder equipped with a piston, in which the pressure drives the piston forward and the negative pressure pulls it back. Another example is the coating of solid bodies with a mantle of elastic material.

Belegning av faste legemer med en mantel av elastisk materiale medfører ofte problemer, blandt annet på grunn av de betydelige krefter som kreves for å spenne ut for eksempel en elastisk hylse slik at et legeme kan innføres i hylsen. Det finnes idag anordninger, for eksempel mekaniske inn-retninger, for å bekle legemer med en mantel av elastisk materiale ved utspenning av dette, hvorved betydelige krefter kreves for å dra tilbake utspenningsanordningen etter utspenning. Man kan selvsagt også ekspandere den elastiske hylsen med trykkluft. Denne fremgangsmåten har flere begrensninger, da hver hylsedimensjon krever sin egen utspenningsanordning. Videre er det på grunn av tilførselen av trykkluft til den elastiske hylsens indre volum, av vesentlig betydning at veggen i hylsen er tett, ettersom minste lekkasje av trykkluft medfører at hylsen må kasseres. Derfor medfører også denne fremgangsmåten problemer, og fremfor alt betydelige kostnader. Med kjente fremgangsmåter kan heller ikke så stor anlegningskraft oppnås mellom den elastiske hylsen og legemet, slik at man kan unnvære et særskilt adhesjonsmiddel mellom legemet og hylsen. Coating of solid bodies with a mantle of elastic material often causes problems, among other things due to the considerable forces required to expand, for example, an elastic sleeve so that a body can be introduced into the sleeve. There are devices today, for example mechanical devices, to coat bodies with a mantle of elastic material when it is stretched, whereby considerable forces are required to pull back the stretching device after stretching. You can of course also expand the elastic sleeve with compressed air. This method has several limitations, as each sleeve dimension requires its own expansion device. Furthermore, due to the supply of compressed air to the inner volume of the elastic sleeve, it is of essential importance that the wall of the sleeve is tight, as the slightest leakage of compressed air means that the sleeve must be discarded. Therefore, this method also entails problems, and above all significant costs. With known methods, such a large application force cannot be achieved between the elastic sleeve and the body, so that a special adhesion agent between the body and the sleeve can be dispensed with.

Med foreliggend oppfinnelse unngår man de ovenfor nevnte problemer ved å danne et undertrykk i en lukket beholder, hvilket til sin utforming kan anpasses etter ønsket anvendelsesområde. Hensikten oppnås ved at beholderen, som har formen av en lukket omhylning av stivt materiale, i sin vegg har en første veggjennomgang for tilførsel av trykkmedium og en andre veggjennomgang som er koblet til en ventil. Inne i beholderen finnes et elastisk deformerbart kammer, for eksempel i formen av en gummislange, som i spiralform løper langsetter den indre overflate av beholderens vegg. Det elastiske deformerbare kammer er i sin ene ende tett ansluttet til den første veggjennomgangsventil for tilførsel av trykkmedium og i sin andre ende tilsluttet med en plugg. I beholderens vegg er et lokk, som eksempelvis er oppbygd av flenser, anordnet slik at en åpning kan økes eller minskes. Et medium, for eksempel vann, innføres i beholderen i en mengde som motsvarer beholderens indre volum, redusert med den nevnte beholders utvidelsesmulighet. Deretter lukkes beholderen med dekslet, og trykkmediet, for eksempel luft, slippes inn i beholderen som herved utvides. Framfor alt trykkes vann etter en viss tid ut gjennom nevnte ventil, hvorved denne umiddelbart stenges, trykkluftstilførselen avbrytes og overtrykket i beholderen slippes ut. Beholderens vegger strever deretter, gjennom den i disse oppbygde spenning, for igjen å innta sin opprinnelige form og overfører dermed et vesentlig undertrykk til det omgivende mediet. Ved at man velger en elastisk deformerbar beholder med vegger av betydelig tykkelse og god elastisitet, kan det ifølge oppfinnelsen oppnås et betydelig undertrykk i den lukkede beholder, hvilket kan utnyttes i anordninger som krever undertrykk. With the present invention, the above-mentioned problems are avoided by creating a negative pressure in a closed container, the design of which can be adapted to the desired area of application. The purpose is achieved by the container, which has the form of a closed envelope of rigid material, in its wall having a first wall passage for the supply of pressure medium and a second wall passage which is connected to a valve. Inside the container there is an elastically deformable chamber, for example in the shape of a rubber hose, which runs spirally along the inner surface of the container's wall. The elastic deformable chamber is at one end tightly connected to the first road passage valve for the supply of pressure medium and at its other end is connected with a plug. In the wall of the container, a lid, which for example is made up of flanges, is arranged so that an opening can be increased or decreased. A medium, for example water, is introduced into the container in an amount corresponding to the container's internal volume, reduced by the said container's expansion capability. The container is then closed with the lid, and the pressure medium, for example air, is let into the container, which thereby expands. Above all, after a certain time, water is pushed out through said valve, whereby this is immediately closed, the compressed air supply is interrupted and the excess pressure in the container is released. The walls of the container then struggle, through the tension built up in them, to regain their original shape and thus transmit a significant negative pressure to the surrounding medium. By choosing an elastically deformable container with walls of significant thickness and good elasticity, a significant negative pressure can be achieved in the closed container according to the invention, which can be used in devices that require negative pressure.

Et vesentlig anvendelsesområde for oppfinnelsen utgjør bekledning av faste legemer med en mantel av elastisk materiale, fortrinnsvis gummi, i form av en hylse med relativt tykke vegger og hensiktsmessig lengde. Hylsen er ved hjelp av et tetningsorgan, tilsluttet i sin ene ende. Hylsens andre ende er forsynt med en utspenningsanordning med hvilken den åpne ende kan utvides. En åpning dannes i det nevnte lokk ved fjerning av et så stort antall av de nevnte flenser at ønsket åpnlngsareal oppnås. Den med tetnlngs-anordnlngen tilsluttede ende av hylsen føres inn i beholderen inntil utspenningsanordningen ved hylsens åpne ende ligger an mot den nevnte åpningen på en slik måte at utspenningsanordningen sammen med hylsens åpne ende, danner et lokk mot beholderen. An important area of application for the invention is the covering of solid bodies with a mantle of elastic material, preferably rubber, in the form of a sleeve with relatively thick walls and an appropriate length. The sleeve is connected at one end by means of a sealing device. The sleeve's other end is provided with an expansion device with which the open end can be expanded. An opening is formed in the said lid by removing such a large number of the said flanges that the desired opening area is achieved. The end of the sleeve connected to the sealing device is fed into the container until the expansion device at the open end of the sleeve rests against the aforementioned opening in such a way that the expansion device, together with the open end of the sleeve, forms a lid against the container.

Ventilen i beholderens vegg åpnes, hvoretter trykkmediet, fortrinnsvis luft, innføres i det deformerbare elastiske kammer via et trykkluftsaggregat. Trykkluften utvider nå det elastiske deformerbare kammer, hvilket på sin side presser ut., det i beholderen tilførte mediet, i dette tilfelle vann, mot ventilen. Når mediet begynner å trenge ut av ventilen, avstenges denne, tilførselen av trykkmediet i det elastiske deformerbare kammer avbrytes og trykkluften slippes ut av det elastiske deformerbare kammer gjennom en til trykkluftsaggregatet tilhørende ventil. Herved utvides hylsen av elastisk materiale proporsjonalt mot det elastiske deformerbare kammerets sammentrekning, og hylsens tverrsnittsareal utvides betydelig. Et fast legeme, med et tverrsnittsareal som er betydelig større enn hylsens opprinnelige tverrsnittsareal, kan nå Innføres i hylsen, hvoretter ventilen åpnes og luft strømmer inn i beholderen, hvorved hylsen trekker seg sammen til fast grep mot det faste legemet, hvilket herigjennom blir forsynt med en mantal av elastisk materiale, fortrinnsvis gummi. The valve in the container's wall is opened, after which the pressure medium, preferably air, is introduced into the deformable elastic chamber via a compressed air unit. The compressed air now expands the elastic deformable chamber, which in turn pushes out the medium supplied in the container, in this case water, towards the valve. When the medium starts to seep out of the valve, it is closed, the supply of the pressure medium in the elastically deformable chamber is interrupted and the compressed air is released from the elastically deformable chamber through a valve belonging to the compressed air unit. Hereby, the sleeve of elastic material expands proportionally to the contraction of the elastically deformable chamber, and the cross-sectional area of the sleeve expands significantly. A solid body, with a cross-sectional area that is considerably larger than the sleeve's original cross-sectional area, can now be introduced into the sleeve, after which the valve is opened and air flows into the container, whereby the sleeve contracts to a firm grip against the solid body, which is thereby supplied with a mantle of elastic material, preferably rubber.

Oppfinnelsen beskrives nærmere nedenfor, med henvisning til vedlagte tegninger, hvilke skjematisk illustrerer et utførelseseksempel, og hvori; The invention is described in more detail below, with reference to the attached drawings, which schematically illustrate an exemplary embodiment, and in which;

fig. 1 viser, fra siden og i snitt, en anordning for dannelse av undertrykk, som via en ventil tilsluttes til en enhet som krever undertrykk, og fig. 1 shows, from the side and in section, a device for creating negative pressure, which is connected via a valve to a unit that requires negative pressure, and

fig. 2 viser, ved benyttelse av innretningen I fig. fig. 2 shows, when using the device in fig.

1, en fremgangsmåte for å bekle et legeme med en mantal av elastisk materiale, fortrinnsvis gummi. 1, a method for covering a body with a mantle of elastic material, preferably rubber.

I fig. 1 vises en beholder 1 i snitt, hvilken beholder er av et stivt materiale, fortrinnsvis stål. I beholderen l's øvre del finnes et lokk 2. Lokket 2 er oppbygget av et antall, mot hverandre på tettsluttende måte anbragte flenser 3, av hvilke den nedre er tett tilsluttet mot beholderen l's øvre del. De nevnte flenser 3 danner tilsammen en tettsluttende enhet. Lengst oppe i beholderen l's sidevegg 4 er en ventil 5 anordnet, som lett kan åpnes og stenges. I beholderen l's nedre del er det en veggjennomgang 6 anordnet, anpasset slik at et tilslutningsorgan, fortrinnsvis for et trykkluftsaggregat 7, kan kobles til veggjennomgangen 6, hvilket på sin side inne i beholderen 1 lett kan tilsluttes til et elastisk deformerbart kammer 8. Dette lukkede kammer 8 er i det viste eksempel utformet som en slange av ikke armert gummi, hvilket i spiral føres opp mot beholderen l's øvre del langsetter sideveggen 4. Det elastiske deformerbare kammer 8's øvre del er tett tilsluttet med en plugg 9. Beholderen l's øvre vegg 10 og dets nedre vegg 11 er tett tilsluttet til beholderen l's sidevegg 4. In fig. 1 shows a container 1 in section, which container is made of a rigid material, preferably steel. In the container 1's upper part there is a lid 2. The lid 2 is made up of a number of flanges 3 placed against each other in a tight fitting manner, the lower one of which is tightly connected to the container 1's upper part. The aforementioned flanges 3 together form a tight-fitting unit. At the very top of the container 1's side wall 4, a valve 5 is arranged, which can be easily opened and closed. In the container 1's lower part, a wall passage 6 is arranged, adapted so that a connecting device, preferably for a compressed air unit 7, can be connected to the wall passage 6, which in turn inside the container 1 can easily be connected to an elastically deformable chamber 8. This closed In the example shown, chamber 8 is designed as a hose of non-reinforced rubber, which is guided in a spiral towards the container l's upper part along side wall 4. The elastic deformable chamber 8's upper part is tightly connected with a plug 9. Container l's upper wall 10 and its lower wall 11 is tightly connected to the container 1's side wall 4.

Et langstgrakt legeme av stivt materiale skal nå forsynes med en bekledning av relativt tykt elastisk materiale, hvilket har form av en hensiktsmessig hylse med tilstrekkelig veggtykkelse og et tverrsnittsareal, som i avlastet tilstand er betydelig mindre enn tverrsnittsarealet av legemet som skal bli belagt. An elongated body of rigid material must now be provided with a coating of relatively thick elastic material, which takes the form of an appropriate sleeve with sufficient wall thickness and a cross-sectional area, which in the unloaded state is significantly smaller than the cross-sectional area of the body to be coated.

Denne hylse, som på tegningenes fig. 2 betegnes med 12, har selvsagt en til det nevnte legemet anpasset lengde. Først tilsluttes hylsen 12's ene ende, for eksempel gjennom en klemmeanordning 13. Hylsen 12's andre ende forsynes med en utspenningsanordning i form av en krage 14, hvilken har et noe større tverrsnittsareal enn legemet som skal bekles. Hylsen 12's åpne ende dras over kragen 14 på en slik måte, at hylsen 12 og kragen 14 tilsammen danner en trakt for Innføring av det nevnte legemet. This sleeve, which in the drawings fig. 2 is denoted by 12, of course has a length adapted to the aforementioned body. First, one end of the sleeve 12 is connected, for example through a clamping device 13. The other end of the sleeve 12 is provided with an expansion device in the form of a collar 14, which has a slightly larger cross-sectional area than the body to be covered. The open end of the sleeve 12 is pulled over the collar 14 in such a way that the sleeve 12 and the collar 14 together form a funnel for introducing the said body.

Den øverste av flensene 3 i lokket 2 fjernes. Likeså fjernes ytterligere .så mange av flensene 3 at kragen 14's tverrsnittsareal er noe større enn tverrsnittsarealet for den øverste av de gjenstående flenser 3. Beholderen 1 påfylles et medium 15, fortrinnsvis vann, i en slik mengde at det i beholderen 1 oppstår en luftlomme 16, hvJ^fkets volum motsvarer den ønskede utvidelsen av hylsen 12. Hylsen 12's med klemanordningen 13 tilsluttede ende føres ned i beholderen 1, inntil kragen 14 ligger an mot den øverste av de gjenstående flenser 3, hvorved kragen 14 danner et lokk mot beholderen 1. Ventilen 5 åpnes, trykkluftsaggregatet 7 aktiveres og luft presses under stor kraft inn i det elastiske deformerbare kammer 8, som dermed utvides og presser mediet 15 mot beholderen l's øvre vegg 10. Herigjennom minskes luftlommen 16 ved at luften i denne føres ut av beholderen 1 gjennom ventilen 5. Når vann 15 begynner å trenge ut av ventilen 5, stenges denne, trykkluftstilførselen fra aggregatet 7 avbrytes og den komprimerte luft i det elastiske deformerbare kammer 8 slippes tilbake ut gjennom en til trykkluftsaggregatet 7 tilsluttet ventil, hvorved det elastiske deformerbare kammer 8 trekker seg sammen på grunn av den opplagrede kraft i dets vegger. Ved at hylsen 12 er oppbygget av et elastisk materiale, utvides den proporsjonalt med det elastiske deformerbare kammer 8's sammentrekning ettersom beholderen 1 ikke kan forandres sin form og når mediet 15 har konstant volum under de trykk- og tempera-turforhold som råder i denne sammenheng. Lekkasje via kragen 14 kan ikke oppstå på grunn av at denne med stor kraft suges mot den øverste av de gjenværende flenser 3. The top of the flanges 3 in the lid 2 is removed. Similarly, so many of the flanges 3 are removed that the cross-sectional area of the collar 14 is somewhat larger than the cross-sectional area of the uppermost of the remaining flanges 3. The container 1 is filled with a medium 15, preferably water, in such an amount that an air pocket 16 is formed in the container 1 , the volume of which corresponds to the desired expansion of the sleeve 12. The sleeve 12's end connected to the clamping device 13 is guided down into the container 1, until the collar 14 rests against the uppermost of the remaining flanges 3, whereby the collar 14 forms a lid against the container 1. The valve 5 is opened, the compressed air unit 7 is activated and air is forced under great force into the elastic deformable chamber 8, which thus expands and presses the medium 15 against the container 1's upper wall 10. Through this, the air pocket 16 is reduced by the air in it being led out of the container 1 through the valve 5. When water 15 begins to seep out of the valve 5, this is closed, the supply of compressed air from the aggregate 7 is interrupted and the compressed air in the elastic deformable chamber 8 is released back out through a valve connected to the compressed air unit 7, whereby the elastic deformable chamber 8 contracts due to the stored force in its walls. As the sleeve 12 is made up of an elastic material, it expands proportionally with the elastic deformable chamber 8's contraction, as the container 1 cannot change its shape and when the medium 15 has a constant volume under the pressure and temperature conditions that prevail in this context. Leakage via the collar 14 cannot occur because this is sucked with great force against the uppermost of the remaining flanges 3.

I den gjennom ovenfor nevnte fremgangsmåte utvidede hylse 12, kan nå lett, og uten tilførsel av ekstra kraft, tilføres i et legeme 17, hvilket har et ytre tverrsnittsareal som er betydelig større enn hylsen 12's opprinnelige ytre tverr snittsareal. Etter/innførsel av legemet 17 i hylsen 12 (fig. In the sleeve 12 expanded through the above-mentioned method, it can now easily, and without the application of extra force, be fed into a body 17, which has an outer cross-sectional area that is significantly larger than the sleeve 12's original outer cross-sectional area. After/inserting the body 17 into the sleeve 12 (fig.

2) åpnes ventilen 5, hvorved luft kan strømme inn i be-6 2) the valve 5 is opened, whereby air can flow into be-6

holderen 1. Dermed fjernes undertrykket, og hylsen 12 av elastisk materiale gjeninntar sin opprinnelige dimensjon, hvilket medfører at hylsen 12 med betydelig kraft trykkes mot legemet 17's ytre overflate og blir praktisk talt umulig å fjerne uten at hylsen 12 ødelegges. Legemet 17, med sin bekledning i form av hylsen 12 av elastisk materiale, løftes nå ut av beholderen 1 gjennom åpninger i den øvre veggen 10, kragen 14 og klemanordningen 13 fjernes og overflødig del av hylsen 12 tas bort. Man har nå oppnådd et legeme med en meget bra tilklebet bekledning av elastisk materiale. Det kreves derfor ingen spesielle adhesjonsmidler mellom legemet og hylsen. Av denne grunn, kreves heller ikke at legemets ytre overflate og/eller hylsens indre overflate blir behandlet særskilt for å øke friksjonen i de anliggende områder. the holder 1. Thus the negative pressure is removed, and the sleeve 12 of elastic material regains its original dimension, which means that the sleeve 12 is pressed with considerable force against the body 17's outer surface and becomes practically impossible to remove without the sleeve 12 being destroyed. The body 17, with its covering in the form of the sleeve 12 of elastic material, is now lifted out of the container 1 through openings in the upper wall 10, the collar 14 and the clamping device 13 are removed and the excess part of the sleeve 12 is taken away. One has now achieved a body with a very well-adhered covering of elastic material. No special adhesion agents are therefore required between the body and the sleeve. For this reason, it is also not required that the outer surface of the body and/or the inner surface of the sleeve be treated separately to increase the friction in the relevant areas.

Ovenstående utførelseseksempel er en blandt mange måter å utnytte anordningen ifølge oppfinnelsen. Den beskrevne anordning er i sin utførelse meget enkel og i første hånd tiltenkt for manuell håndtering. En fagmann innser at det er lett å automatisere anordningen ved å utnytte hydrauliske og elektriske håndteringsanordninger samt hensiktsmessige kontrollorgan. The above design example is one of many ways to utilize the device according to the invention. The described device is very simple in design and primarily intended for manual handling. A person skilled in the art realizes that it is easy to automate the device by utilizing hydraulic and electrical handling devices as well as appropriate control means.

Claims

1. Method for generating negative pressure in a container (1), characterized in that the container (1) is filled with a medium (15), preferably water, until a suitable air pocket (16) occurs at the top of the container (1), that in the container (1) an elastic chamber (8) is arranged, which through the supply of a pressure medium, preferably air, can be expanded and in this way press the agent (15) against the upper wall (10) of the container (1) through an open and closable valve (5), which is arranged at the upper wall (10) of the container (1), whereby the air pocket (16) is removed from the container, so that when the medium (15) begins to seep out of the valve (5) it is closed, and the supply of the pressure medium from a compressed air unit (7) is interrupted, then the excess pressure in the elastic deformable chamber (8) is released, whereby the chamber (8) because it has relatively thick walls and is very elastic, contracts and tries to regain its original form and thereby in the container (1) a significant underpressure occurs, which ikk e is canceled before the valve (5) is opened and allows air or other medium to flow into the container (1).

2. Method for generating negative pressure in a closed container (1) according to claim 1, characterized in that the air pocket (16) in the container (1) expands so that it fills the entire inner volume of the container (1).

3. Device for generating negative pressure in a closed container (1), characterized in that the container (1) is made of rigid material, e.g. steel, which container is dimensioned based on the area of application, with a passage (6) for the supply of a pressure medium arranged in the container (l)'s wall (4), with an uppermost in the container (l)'s wall ( 10) arranged valve (5), which can be opened and closed, an elastic chamber (8), designed as a hose with relatively thick walls, which is arranged so that its one end is firmly connected to the passage (6) and its other end is sealed with a plug (9) or other sealing device, and so that it is arranged in spiral form, the inner side of the container (1) extends along the wall (4).

4. Device according to claim 3, characterized in that the elastic chamber (8) is designed so that it forms an inner, stretchable wall in the container (1) and so that the pressure medium through the passage (6) has free passage to the space between the container (1)' s walls and the elastic chamber

5. Device according to claim 3 or 4, characterized in that the upper wall (10) of the container (1) is provided with a lid (2) which is comprised of a number of flanges (3) that are tightly connected to each other and provided with gaskets, which have such dimensions, that if an appropriate number of flanges (3) are removed, a pyramid-shaped insertion opening is formed which fits a collar (14) for an elastic sleeve which is inserted through said insertion opening and which flanges (3) together can completely connect it mentioned the import opening.

6. Device according to at least one of claims 3 - 5, characterized in that the valve (5) furthest up in the wall (10) of the container can be connected to a device that utilizes the negative pressure in the container (1), which negative pressure is created by the supply of pressure medium to the aforementioned elastic chamber (8) and then the following discharge of the excess pressure in this after closing the valve (5).

7. Device according to at least one of claims 3 - 6, characterized in that the elastic chamber (8) can be elongated, tubular, cubic or have a spherical shape.

8. Method for generating negative pressure in a closed container (1) according to at least one of claims 1-2, characterized in that a sleeve (12) of elastic material, preferably rubber, and with relatively thick walls, is provided with an expanding collar (14) at its one open end, and is closed through a plug or a clamping device (13) at its other end, that one or more of the flanges (3) in the lid (2) is removed, whereby an inlet opening is obtained through which the sleeve (12) is introduced with the end closed according to the above first, after which the collar (14) will lie against the outermost of the remaining flanges (3), and in such a way that the sleeve (12) with its plug or its clamping device (13) and its collar (14) ) replaces the lid (2) and one or more of the flanges (3), that the valve (5) is then opened, the compressed air unit (7) is activated and the pressure medium is introduced into the elastic chamber (8), whereby it expands and air is forced out of the valve (5), after which the valve (5) is closed as soon as possible through this medium a (15) begins to penetrate, the compressed air unit (7) is shut off and the excess pressure is released by the elastic chamber (8), which thus contracts, after which the elastic sleeve (12) expands proportionally to the elastic chamber (8)'s contraction, whereby the inner cross-sectional area of the sleeve (12) is significantly increased.

9. Device according to at least one of claims 3 - 7, characterized in that the container (1) in its lower wall (11) is arranged with an opening with a lid (2) and flanges (3) for connecting the sleeve (12) to the said the opening.

10. Method for generating negative pressure in a closed container (1), according to claim 1 or 2 and with the utilization of the device according to claim 9, characterized in that the sleeve (12)'s plug or clamping device (13) is removed and replaced with a force (14 ), which collar is connected to the opening in the lower wall (11) of the container (1), whereby the sleeve (12) forms a cavity which runs completely through the container (1).