JPH03176334A - Method and device to generate low pressure in airtight container - Google Patents

Abstract

PURPOSE: To generate low pressure in a sealed container by providing an elastically deformable elastic chamber of rubber tubular shape in the container, and introducing a medium with a quantity corresponding to the volume in the container to be reduced according to the expansion of the elastic chamber into the container. CONSTITUTION: An end of a sleeve 12 closed by a spring device 13 is led into a container 1. A valve 5 is opened to urge a pressure unit 7, and the compressive medium of high pressure is led into an elastic chamber 8. The elastic chamber 8 is expanded thereby, and the medium 15 is pressed against an upper wall surface 10 of the container 1. When the medium 15 appears through the valve 5, the valve 5 is closed, the feed of the compressive medium from the pressure unit 7 is stopped, and the compressive medium in the elastic chamber 8 is discharged through the valve. The sleeve 12 is expanded in proportion to the contraction of the elastic chamber 8. After a body 17 is led into the sleeve 12, the valve 5 is opened to allow the air to flow into the container 1. The low pressure is released thereby, the sleeve 12 formed of an elastic material is returned to its original dimension, and the sleeve 12 is pressed against an external surface of the body 17 with considerable force.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for generating low pressure within a closed container.

In various applications, for example in the manufacturing sector, low pressures are required where controllable suction is absolutely necessary in connection with power transmission or material handling.

Examples of such fields include hydraulic equipment that requires high and low pressures, such as cylinders where high pressure pushes a piston forward and low pressure retracts the piston.

Another example is to cover a solid body with a cover of elastic material.

When covering a solid body with a cover of elastic material, problems often arise, for example from the fact that expanding the elastic sleeve and introducing the body into the sleeve requires a considerable amount of pressure, e.g. Mechanical devices that cover the body with a cover of elastic material that takes advantage of its expansion require considerable force to deflate the expansion device after expansion. Of course, the sleeve can also be expanded with compressed air. This method has many inconveniences as it requires a specific inflation device for each sleeve size.

By supplying compressed air inside the sleeve, there is also the very important issue that the walls of the sleeve are tight and no leakage of compressed air is allowed. For these reasons, this method is problematic primarily in terms of cost. With conventional methods, it is not possible to create large contact pressures between the elastic sleeve and the body so as to obviate the need for special TA adhesion media between them.

According to the invention, the above-mentioned disadvantages can be overcome by creating a low pressure in a closed container whose shape can be adapted to the desired application. This purpose is that the container in the form of a closed casing is the first for supplying pressure medium to its walls.
This is achieved by having a wall inlet and also having a second wall inlet connected to the valve. For example, 1
An elastically deformable elastic chamber in the form of one or more rubber tubes is provided, the tubes extending helically or otherwise along the inner wall of the elastic chamber.
The elastic chamber is tightly connected at one end to a valve in the first wall inlet for the supply of pressure medium and is closed at the opposite end with a plug.The walls of the elastic chamber are provided with a cover, for example a cover consisting of a flange. This cover can be made larger or smaller by increasing or decreasing the flange, or
It can be closed completely. A medium is introduced into the container in an amount corresponding to the internal volume of the container, which decreases as the elastic chamber expands.
For example, introducing water. The container is then closed with a cover and a pressure medium, for example air, is introduced into the elastic chamber and inflates it. If the medium introduced into the container is discharged after a period of time through said valve, the valve immediately closes, stopping the supply of pressure medium and allowing the excess pressure in the elastic chamber to be discharged. The walls of the elastic chamber then contract under their own tension and return to their original shape, creating a significantly lower pressure in the surrounding medium. A fairly low pressure can be created within the closed container, which can be utilized by external devices that require low pressure.

An important field of application of the invention is the covering of a solid body with a cover of elastic material, preferably rubber, in the form of a sleeve with relatively thick walls and a suitable length. The sleeve is tightly closed at one end with a clamping device and the opposite end is provided with an expansion device to assist in its expansion. Openings are created in the cover by removing as many flanges as are necessary to obtain the desired opening area. The sleeve, closed with the tightening device, is introduced into the container until the inflation device at its open end engages said opening and the inflation device joins with the open end of the sleeve to form a cover for the container. Ru. When a valve in the wall of the container opens, a pressure medium, preferably air, is introduced from the pressure unit into the elastic chamber.

This pressure medium expands the elastic chamber and forces the medium introduced into the container to be discharged through the valve. When the medium begins to escape outwardly through the valve, the valve is closed, the supply of pressure medium in the elastic chamber is stopped, and the pressure medium is discharged from the elastic chamber through the valve. Thereby, the sleeve of elastic material expands in proportion to the contraction of the elastic chamber, and the cross-sectional shape of the sleeve widens considerably. A solid body in which the cross-sectional seat is considerably larger than the original cross-sectional area of the sleeve can thus be introduced into the sleeve, after which the valve is opened and air begins to flow into the container, thereby causing the sleeve to become a solid body. The solid body can be covered with a cover of elastic material, preferably rubber, which is tightly contracted around the body.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a container 1 made of a rigid material, preferably steel.
The cross section of is shown. There is a cover 2 on the top of the container 1. This cover 2 is composed of a large number of flanges 3,
These flanges are closely spaced to each other, with the lower flange in tight mating to the top of the container 1. These flanges 3 together form a tight unit. A valve 5 is provided at the upper end of the side wall 4 of the container l, and this valve can be easily opened and closed. In the lower part of the container 1, a wall inlet 6 is provided, which is configured in such a way that a connection unit, preferably of a pressure unit, can be connected; It can be connected to an elastic chamber 8 that can be elastically deformed.

In the illustrated embodiment, the elastic chamber 8 is a tube made of unreinforced rubber, which extends spirally along the side wall 4 to the top of the container l.

In other embodiments, the elastic chamber 8 may consist of several tubes or may be in the form of an elongated cube or sphere. The upper part of the elastic chamber 8 is closed with a plug 9. The upper wall 10 and the lower wall 1ill of the container 1 are in close connection with the side wall 4 of the container 1.

Now 1. It has an elongated body made of rigid material. Assume that you are trying to cover it with a relatively thick cover of elastic material. In this case, the cover has a suitable sleeve shape with sufficient wall thickness and a cross-sectional area which in the undeformed state is considerably smaller than the cross-sectional area of the body to be covered.

This sleeve, indicated at 12 in FIG. 2, has, of course, a length to match the body. One end of the sleeve 12 is provided with an inflation device in the form of a collar 14, which has a cross-sectional area somewhat larger than the body to be coated. The open end of the sleeve 12 is drawn around the collar 14 so that the sleeve 12 together with the collar 14 forms a funnel into which the body is introduced.

The upper flange of the flanges 3 on the cover 2 is removed. Also, the cross-sectional area of the collar 14 removes the upper lateral side of the remaining flange 3. Container l contains medium 15. Preferably, the container 1 is filled with water, but the amount is such that air bubbles 16 remain in the container 1. The volume of the bubble here corresponds to the desired degree of expansion of the sleeve 12. The end of the sleeve 12, closed by the spring device 13, is introduced into the container l, so that the collar 14 finally engages the upper of the remaining flanges 3.

The collar 14 thereby becomes a cover for the container 1. Then, the valve 5 is opened, the pressure unit 7 is energized, and the high-pressure compressed medium is introduced into the elastic chamber 8, thereby expanding the elastic chamber 8 and directing the medium 15 towards the upper wall surface 10 of the container 1. Press. At this time, the air bubbles 16 are reduced because the air inside the container 1 is expelled through the valve 5. When water 15 begins to appear through the valve 5, the valve 5 is closed, the supply of compressed medium from the pressure unit 7 is stopped, and the compressed medium in the elastic chamber 8 is discharged via the valve. Then, the elastic chamber 8 contracts due to the force applied to its wall surface. Since the sleeve 12 is made of elastic material, this word 1-I-1-I-Kite Jun e#oHa-sho ■1 more shoulder! This is because the container 1 does not change its shape and the medium 15 maintains a constant volume under preferential pressure and temperature conditions. No leakage through the collar 14 occurs due to the large suction force exerted on the upper flange.

A body 17 having a cross-sectional area considerably larger than the original cross-sectional area of the sleeve 12 can be introduced easily and without additional forces into the sleeve 12 enlarged as described above. After introducing the body 17 into the sleeve 12 (FIG. 2), the valve 5 is opened to allow air to flow into the container 1. Thereby, the underpressure is released and the sleeve 12 of elastic material returns to its original dimensions, compressing the sleeve 12 with a considerable force towards the outer surface of the body 17.

Thus, the body 17 covered with a cover in the form of a sleeve 12 of zero-elastic material can be lifted out of the container l through an opening in the top wall 10, such that the sleeve 12 cannot practically be removed from the body without breaking. after that,
Remove the collar 14 and spring device 13 and remove the excess portion of the sleeve 12. The body is thus provided with a very close-fitting cover of elastic material2. , for this reason there is no need to use special adhesives between the body and the sleeve, neither the outer surface of the body nor the inner surface of the sleeve needs to be specially treated to increase the friction of the contact surfaces.

The embodiment described above illustrates only one of the many ways in which the device according to the invention may be used. In another embodiment not shown, the closed container includes one first housing and two or more second housings connected to each other. In these embodiments, the generation of low pressure occurs within the first housing.

A low pressure is then communicated, for example through one or more tubes or hoses, to the second housing where enlargement of the object occurs. Apparatus and methods for these other embodiments are also defined in the claims.

Although the device of the invention is very simple in construction and is intended primarily for manual use, it is understood that it can also be automated using hydraulic or electrical processing equipment in conjunction with suitable control equipment. It will be clear to those skilled in the art. The invention is therefore not limited to the embodiments shown and described above, but may vary within the scope of the claims.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a low pressure generator connected through a valve to a unit requiring low pressure. FIG. 2 is an external view illustrating the method of covering a body with a cover of elastic material, preferably rubber, using the apparatus shown in FIG. In the drawings, l...container, 2...cover, 3...
- Flange, 5... Valve, 6... Wall inlet, 8... Elastic chamber, 9-... Plug, 10... Upper wall, 12... Sleeve, 13... Spring device, 14 ...Color, 15...Medium. 16... air bubbles, 17... engraving of the body drawing (no change in content) FIG, 2 procedural amendment (method) 1. Indication of the case 1999 Patent Application No. 303464 2. Name of the invention In a sealed container Method and device for generating low pressure in

Claims (1)

[Claims] 1) A method for generating a low pressure in a closed container (1), in which a medium (5) is preferably added to the container (1) until a suitable air bubble (16) is obtained in the upper part of the container (1). is filled with water and spread by supplying a pressure medium, preferably air, through an open closable valve (5) into the container (1), and spreading the medium (10) onto the upper wall surface (10) of the container (1).
15) is provided with an elastic chamber (8) that can press the
Said valve (5) is arranged at the upper wall surface (10) of the container (1), thereby removing air bubbles (16) from the container (1) and causing the medium (15) to emerge from the valve (5). At the start, the valve is closed, preferably stopping the supply of pressure medium from the pressure unit (7), and then the excess pressure in the elastic chamber (8) is released, so that the elastic chamber (8) Due to its relatively thick walls and large elasticity, it tends to contract back to its original shape, creating a fairly low pressure inside the container (1), which is not released until the valve (5) is opened, and other than air A method characterized in that the medium is allowed to flow into the container (1). 2) Air bubbles (16) in the container (1) expand and form the container (1)
2. The method according to claim 1, wherein the method fills the entire internal volume of the method. 3) A device for generating low pressure in a closed container, comprising a container (1) made of a rigid material, for example steel, which container is sized according to the application and whose walls ( 4) is provided with a wall inlet (6) for the supply of pressure medium, and a valve (5) is provided in the upper part of the wall (10) of the container (1), which can be opened and closed, and also has a relatively thick One or several tube-shaped elastic chambers (8) with walls are provided, the elastic chambers having one end connected to the wall inlet (6).
and is arranged to be tightly connected to the opposite end by a plug (9) or other fastening device, and also has an elastic chamber (8).
) preferably extends in a helical or other manner inside the container (1). 4) The elastic chamber (8) is shaped in such a way as to create a telescopic inner wall in the container (1), so that the pressure medium flows through the wall inlet (6) into the wall of the container (1) and the elastic chamber (8). 4. A device according to claim 3, characterized in that the device can freely flow into the space between. 5) The upper wall surface (10) of the container (1) has many flanges (3
), the flanges pressing tightly against each other, and gaskets, which cover a suitable number of flanges (3).
) are dimensioned to create pyramid-shaped inlets when removed, and these inlets are fitted with elastic sleeves (
12), this elastic sleeve being introduced into said inlet, allowing the flange (3) to tightly close said inlet. The device according to item 4. 6) An outlet equipped with a valve (5) is provided in the upper part of the wall (10) of the container (1), which outlet can be connected to a device that utilizes the low pressure inside the container (1), and this low pressure Claims 3 to 5 characterized in that it is obtained by closing the valve (5) after supplying the pressure medium to the elastic chamber (8) and then releasing excess pressure in the elastic chamber (8). The device according to any one of. 7) Device according to any one of claims 3 to 6, characterized in that the elastic chamber (8) has the shape of an elongated tubular cube or sphere. 8) A sleeve (12) made of an elastic material, preferably rubber, and having a relatively thick wall, provided at one open end with an inflatable collar (14) and closed at the opposite end with a plug or spring device (13); one or several of the flanges (3) of the cover (2) can be removed to obtain an inlet opening through which one end of the sleeve is introduced and tightened as described above, after which , the collar (14) presses against the outer one of the remaining flanges (3), and the sleeve (12), together with the plug or tightening device (13) and its collar (14), is pressed against the cover (
2) as well as one or more flanges (3), after which the valve (5) is opened to direct the pressure medium into the elastic chamber (
8), whereby the elastic chamber (8) expands and forces the air out of the valve (5), and then as soon as the medium (15) begins to discharge through the valve (5). is closed, the pressure unit (7) is stopped, and the excess pressure is discharged from the elastic chamber (8), thereby causing the elastic chamber to contract and the elastic sleeve (12) to move in proportion to the rate of contraction of the elastic chamber (8). 3. Device according to claim 1, characterized in that the inner cross-sectional area of the sleeve (12) is increased considerably. 9) The container (1) is provided with an opening in its lower wall (11), a flange (3) for connecting the cover (2) and the sleeve (12) to said opening. 7. The device according to any one of 7. 10) Plug or tightening device (
13), replace it with collar (14), and replace it with this collar (1).
9) connecting the sleeve (12) to an opening in the lower wall (11) of the container (1), thereby creating a cavity in which the sleeve (12) extends throughout the container (1). 3. The method according to claim 1, wherein the method uses a device according to claim 1 or 2. 11) the container (1) consists of a first housing and one or several second housings, the second housing being connected to said first housing through one or several tubes or hoses; , the generation of a low pressure with the help of an elastic chamber (8) takes place in said first housing, and this low pressure is sent through said tube or hose to said second housing, where one or several sleeves (12) expansion occurs and a valve (5) is attached to the top of the container (1), which is located within the first housing when the top is placed above the second housing, and the second housing is located within the second housing. 1 housing when placed above said second housing, and where the component according to the preceding claim is intended for the generation of low pressure. Method or device according to any of the preceding claims, characterized in that it is mounted in the first housing and in the second housing if expansion of the sleeve (12) is intended. Or both.