WO2010112202A1

WO2010112202A1 - Closure plug for an outlet opening of a container and container having a closure plug

Info

Publication number: WO2010112202A1
Application number: PCT/EP2010/002022
Authority: WO
Inventors: Heiko Schuster; Sigurd Rödl
Original assignee: Vdeh-Betriebsforschungsinstitut Gmbh
Priority date: 2009-03-30
Filing date: 2010-03-30
Publication date: 2010-10-07
Also published as: US20120086158A1; EP2414117A1

Abstract

The invention relates to a closure plug for an outlet opening of a container that accommodates liquid melt, said closure plug having a closure region on the outer surface thereof that is provided to come into contact with a section of the delimiting wall delimiting the outlet opening in order to close the outlet opening. The closure plug narrows from the closure region towards a front end along the longitudinal axis thereof, said front end being provided to be inserted into the outlet opening, wherein a section between the closure region and the front end is designed in a concave manner.

Description

Sealing plug for an outflow opening of a container and container with a

Sealing plug "

The invention relates to a closure plug for a discharge opening of a container which can receive liquid melt or other solids-laden fluids (gases and liquids), which has a closure region on its outer surface, which is provided with a portion of the

Outflow opening bounding boundary wall to come to close the outflow opening and which tapers along its longitudinal axis from the closure portion to a front end which is intended to be inserted into the outflow opening. Likewise, the invention relates to a container for receiving a melt or other solids laden fluids (gases and

Liquids) in which an outflow opening is defined, which is bounded by a boundary wall, and which has a closure plug for closing the outflow opening, wherein the closure plug has a closure region on its outer surface, which is provided with a portion which delimits the outflow opening Boundary wall to come into contact with the

To close the outflow opening, and which tapers along its longitudinal axis from the closure portion to a front end, which is intended to be inserted into the outflow opening. Likewise, the invention relates to the use of such closure plugs, or the use of such containers. In the field of handling molten metals, it is known that solid particles can be dispersed in metal melts, which can be deposited in the systems through which they flow, for example when they flow out of a container through its outflow opening on the walls, for example on the walls of the outflow opening. This can lead to disruptions of the process flow.

WO 2005/042189 A2 discloses a closure stopper for an outflow opening of a container, which receives liquid melt, which has a closure region on its outer surface, which is intended to come into contact with a section of the boundary wall delimiting the outflow opening in order to contact the

To close outflow opening and which tapers along its longitudinal axis from the closure portion to a front end, which is intended to be inserted into the outflow opening. Furthermore, from WO 2005/042189 A2 a container for receiving a melt is known, in which an outflow opening is formed, which is bounded by a boundary wall, and the one

A closure plug for closing the outflow opening, wherein the closure plug has a closure portion on its outer surface which is intended to come into contact with a portion of the outflow limiting boundary wall to close the outflow opening and extending along its longitudinal axis of the Closing portion tapers toward a front end, which is intended to be inserted into the outflow opening.

According to WO 2005/042189 A2, the above-described problem of the deposition of solid particles of molten metal is to be solved in that on the surface of the

Sealing plug or on the surface of the outlet opening delimiting boundary wall waves are provided, which are arranged such that the size of the flow channel, which forms when lifting the sealing plug between the outer surface of the sealing plug and the boundary wall of the outflow opening becomes larger and larger, the larger the farther the respective part of the flow channel is removed from the point of contact between the closure plug and the boundary wall with the closure plug closed. Due to the undulating, step-shaped design of the surface of the sealing plug, in the construction according to WO 2005/042189 A2 it is to be achieved that the particles flowing past the surface of the sealing plug

Flow at individual points along the surface tears off, because the surface suddenly jumps back at these points, and thereby turbulent vortexes are formed on the surface of the sealing plug. WO 2005/042189 A2 teaches that the controlled turbulence on the surface of the sealing plug reduces the blockage rate at the surface of the sealing plug by continuously removing non-metallic particles. Additionally, WO does In the case of the possible presence of gases, the controlled turbulences in the region of the plug surface distribute the gas bubbles uniformly around this part of the plug, thereby contributing to the prevention of clogging deposits.

Plug geometries are also known in practice, in which the closure plug has a spherical or conical tip.

Against this background, the invention has the object to provide a closure plug for an outflow opening of a container receiving liquid melt, as well as a container for receiving a melt, which reduces the deposition of particles as it flows through such a system with a particle-laden fluid. Furthermore, a use for such a stopper, or such a container should be specified.

This object is achieved by the independent claims 1, 9 and 12. Advantageous embodiments are given in the subclaims and the description below.

The invention is based on the idea that, inter alia, there is a flow-induced cause for the addition of flow-through pouring systems, namely recirculation zones on the boundary wall of the discharge opening below the plug, which flow separation with resulting local maxima of the flow velocity in the middle of the core flow below the plug Stopfens arise. The invention assumes that this cause leads to an increased deposition of particles on the inner wall of the flow-through system.

The closure plug according to the invention has an outer contour which is intended to guide the flow well. In a preferred embodiment, this is done on the

Closing stopper flowing past fluid through the outer contour of the sealing plug directed so that the flow is parallel to the longitudinal axis of the sealing plug. In a preferred embodiment, the front end of the sealing plug is delimited by a sharp edge from the further surface shape of the sealing plug. As a result, at this, but only at this point forms a separation of the flow. As a result, the formation of a maximum velocity below the plug can be avoided.

The sealing plug according to the invention has, between the closure region and the front end, a section which is concave. Additionally or alternatively, the sealing plug is designed such that the - A -

Closure area is located in a portion of the sealing plug, which is concave. As a result, the stopper is provided with a stopper geometry which is easy to produce and at the same time makes it possible to guide the flow in the discharge opening parallel to the boundary wall of the discharge opening. This can prevent that maximum velocities arise in the middle of the core flow.

Furthermore, a more stable flow guidance can be achieved with the invention. Likewise, with the invention, an avoidance or minimization of the formation of deposits can be achieved. A concavely formed section of the sealing plug is particularly preferably understood to mean a section which has a contour in a sectional plane of the closure plug which contains the longitudinal axis of the sealing plug, in which all surface points on the contour lie on one side of a straight line which defines the starting point and the End point of the contour connects.

The closure area may be a surface area. Often, however, the closure area is designed so that - seen in cross section - a

Closure point is formed, or - based on the surface of the sealing plug - a closure line exists, with which the sealing plug can come into contact with a boundary wall of an outflow opening.

In a preferred embodiment, the surface of the sealing plug in the region between the front end remote end of the closure portion and immediately in front of the front end is designed such that it has only continuous changes in shape. A continuous change in shape is understood in particular to mean those changes in shape in which a first surface does not change into a second surface to form an edge. In particular, a continuous change in shape is understood to mean a change in shape in which a first planar surface does not pass through a transitional surface into a second, planar surface in which the radius of the contour of the transitional surface is smaller than or less than the longitudinal extent of the first surface is the longitudinal extension of the second surface, wherein the longitudinal extension is understood to mean the extension of the surface from the transition surface. A continuous change in shape is understood to mean, in particular, any type of change in shape in which a surface region containing the change in shape does not break off along the flowing flow. By a continuous change in shape, a particularly good flow control can be achieved.

In a preferred embodiment, the sealing plug according to the invention has only a single concave in the region between the end of the closure region remote from the front end and immediately in front of the front end trained section on. As a result, a particularly good flow guidance can be achieved.

In a preferred embodiment, the concaved portion is formed in a cross section through the sealing plug, which takes place in a plane which also includes the longitudinal axis of the sealing plug, essentially by a circular arc or a portion of an ellipse or a portion of a parabola. This also contributes to a good flow guidance. In a preferred embodiment, the arc forming the concave portion, or portion of the ellipse, or portion of the parabola by the arc of a

Circular section, or the section of an ellipse section or the portion of a parabolic section formed, wherein the circular section, or the ellipse section or parabolic section an angle of at least 10 °, more preferably at least 25 ° and more preferably at least 45 °.

In a preferred embodiment, the sealing plug between the concave portion and the front end to a portion which is formed substantially cylindrical. This can serve a good flow guidance. In a preferred embodiment, the cylindrically shaped part of the sealing plug is formed directly adjacent to the front end. In a particularly preferred embodiment, the closure plug according to the invention has a single concave portion, which is adjoined directly by a cylindrically shaped section of the sealing plug, to which, in a particularly preferred embodiment, the front end directly adjoins.

In a preferred embodiment, the front end has a flat surface that lies in a plane that is perpendicular to the longitudinal axis of the sealing plug. Particularly preferably, the front end is completely through such a plane

Surface formed. In a supplementary or alternative, likewise preferred embodiment, the front end may have a concave, inwardly curved end surface. In a particularly preferred embodiment of this alternative embodiment, the entire front end is formed by a concave inwardly curved end surface of the plug.

In a particularly preferred embodiment, a section is provided above the closure region, which is convex. The provision of such a convex portion allows, in a preferred embodiment, in which the closure portion of the sealing plug in a portion of the

Closure plug is concave, this closure area of the Leave Verschusstopfens pass through the adjoining convex portion in the other, usually cylindrically shaped upper part of the sealing plug. However, the invention is not limited to the use with sealing plugs, which have a substantially cylindrical base body.

In a preferred embodiment, the radius of the concaved portion is greater than half the difference between the cross-section of the sealing plug at the distal end of the closure portion and the front end cross-section. This contributes to a particularly good flow guidance.

In a preferred embodiment, a fluid outlet opening is provided at the front end of the sealing plug, from which a fluid flowing through a supply line provided in the sealing plug can escape. From such a

Fluid outlet, for example, argon can be applied.

The container according to the invention for receiving a melt has a closure stopper whose outer contour and the shape of the outlet opening are matched to one another in such a way that the melt flows into the outlet opening when the closure stopper is lifted so far that there is a gap between the outer surface the closure plug and the boundary wall forms, the closure plug is inserted with its front end but still in the outlet opening, flows into the outlet opening, in the region of a boundary wall adjacent to the flow area substantially parallel to the boundary wall directed flow direction. By this flow guidance, the deposition of particles on the boundary wall can be avoided.

In a preferred embodiment, the outer contour of the closure plug and the shape of the outflow opening are matched to one another such that when the closure plug is raised so that a gap forms between the outer surface of the closure plug and the boundary wall, the closure plug with its front End is still introduced into the outlet opening, a gap forms, whose cross-section is extended in the manner of a diffuser to the front end. In this way, the flow is controlled delayed.

An alternative or additional embodiment of the container according to the invention provides that the container has a closure stopper with at least one feature of the sealing stopper according to the invention described above. By the combination of measures that can be implemented on the closure plug with the measures that can be carried out on the boundary wall of the container and their coordination with one another can bring about particularly good flow guidance.

In a particularly preferred embodiment, the sealing plug according to the invention is used with a container for receiving a liquid molten metal. In a particularly preferred embodiment, the container according to the invention is used for receiving a liquid molten metal. It has been found that, especially when used with molten metals, the flow guidance achieved by the closure plug according to the invention or the container according to the invention offers advantages in the reduction of deposits on the walls of the system. The closure plug according to the invention and the container according to the invention can also be advantageously used in other solids-laden fluids (gases and liquids).

The invention will be explained with reference to a drawing illustrating only embodiments. Show:

Fig. 1a. b is a schematic sectional view of a known from practice sealing plug in engagement with the outlet opening of a container for receiving a melt,

2 is a schematic sectional view of a sealing plug according to the invention in engagement with the outflow opening of a container for receiving a melt,

3 is a perspective view of a sealing plug according to the invention,

Fig. 4 is a schematically sectional view through a first

Embodiment of a sealing plug according to the invention in engagement with the outlet opening of a container for receiving a melt,

Fig. 5 is a schematically sectional view of a second

Embodiment of a sealing plug according to the invention in engagement with the outlet opening of a container for receiving a melt. FIGS. 1a, 1b and 2 show the flow conditions resulting from the geometry of the sealing plug and the shape of the outlet opening. The recirculation areas are shown in dashed lines. As can be seen in FIGS. 1a and 1b, recirculation regions close to the wall are formed in sealing plugs known from practice. In the case of the closure stopper according to the invention, in the embodiment shown in FIG. 2, an upwardly directed flow can be established below the newly formed front end (stopper bottom) in which particles or inclusions can increasingly accumulate. However, deposition of these particles on the plug bottom itself can be avoided, for example, by applying a fluid to a fluid outlet at the front end of the plug. The closure plug shape shown in FIG. 1a and known from practice has a spherical front end. The closure plug shape shown in FIG. 1b and known from practice has a conically shaped front end.

The embodiments of the closure stopper according to the invention shown in FIGS. 2, 3, 4, 5 have a closure region 3 on their outer surfaces, which is intended to come into contact with a section of the boundary wall limiting the outflow opening in order to close the outflow opening. The illustrated plug tapers along its longitudinal axis from the

Closure area to a front end, which is intended to be inserted into the outflow opening. Between the front end remote end of the closure portion 3 and the front end, a portion 4 is provided, which is concave. The closure portion 3 is arranged even in this concave portion 4 of the sealing plug. Of the

Closure stopper has a closure point. At the closure point, the plug closes the outflow opening. When lifting the sealing plug here is the point with the narrowest gap, which can be controlled via the provided gap surface of the flow.

The circular arc-shaped concave section 4 deflects the melt so that it flows parallel to the boundary wall of the outflow opening in the transition into a cylindrically shaped, adjoining the concave portion 4 section 5. A sharp edge 6, on which the cylindrically shaped portion 5 in the formed by a flat surface front end of

Closing plug, causes a detachment of the flow from the Verschlusstopfenkontur. The separation point is fixed with the sharp edge. The melt flows from there wall parallel. Above the closure region 3, a portion 2 is provided, which is convex. At the front end of the sealing plug formed by a flat surface, an outlet opening 7 is provided, from which a through a provided in the sealing plug supply line flowing fluid can escape. Argon can be supplied through this fluid outlet opening 7.

In the embodiment shown in Figure 4, the closure point is provided at a 45 ° tangent of the boundary wall of the outflow opening. In the variant provided in FIG. 5, the closure point lies at a 30 ° tangent to the boundary wall of the outflow opening. This closure point of the second variant is often used in known from practice plugs.

Claims

"Claims"

A closure plug for an outflow opening of a container receiving liquid melt, comprising - a closure portion (3) on its outer surface intended to come into contact with a portion of the boundary wall bounding the outflow opening (1), around the outflow opening to close,

- tapers along its longitudinal axis from the closure area (3) to a front end intended to be inserted into the discharge opening, characterized in that a portion (4) between the closure area (3) is concave towards a front end is formed and / or the closure portion (3) is located in a portion (4) of the sealing plug, which is concave.

2. Closure stopper according to claim 1, characterized in that the surface of the sealing plug in the region between the end remote from the front end of the closure region and immediately before the front end has only continuous changes in shape.

3. Closure stopper according to claim 1 or 2, characterized in that between the concave portion (4) and the front end, a portion (5) which is formed substantially cylindrical.

4. Closure stopper according to claim 1, 2 or 3, characterized in that the front end has a flat surface which lies in a plane which is perpendicular to the longitudinal axis of the sealing plug.

5. Closure stopper according to claim 4, characterized in that the plane

Surface is the end surface of the cylindrically shaped, between the concave portion (4) and the front end disposed portion (5).

6. Closure stopper according to one of claims 1 to 5, characterized in that above the closure region (3) has a portion (2) is provided which is convex.

7. Closure stopper according to one of claims 1 to 6, characterized in that the radius of the concave portion (4) is greater than half the difference between the cross section of Closure plug at the end remote from the front end of the closure portion (3) and the cross section of the front end.

8. Closure stopper according to one of claims 1 to 7, characterized in that at the front end of a Fluidauslassöffnung (7) is provided, from which a fluid flowing through a supply line provided in the sealing plug can escape.

9. container for receiving a melt, in which an outlet opening is formed, which is bounded by a boundary wall (1), and the one

Closing stopper for closing the outflow opening, wherein the closure stopper has a closure portion (3) on its outer surface, which is intended to come into contact with a portion of the boundary wall delimiting the outflow opening (1) to close the outflow opening, and the along its longitudinal axis from the closure region (3) tapers towards a front end, which is intended to be inserted into the outflow opening, characterized in that the outer contour of the sealing plug and the shape of the outflow opening are coordinated such that the melt which, when the closure plug is raised so far that a gap between the outer surface of the closure plug and the boundary wall (1) forms, the closure plug is inserted with its front end but still in the outflow opening, flows into the outflow opening, in the region of to the B egrenzungswand (1) adjacent flow region substantially has a parallel to the boundary wall directed flow direction.

10. A container according to claim 9, characterized in that the outer contour of the sealing plug and the shape of the outflow opening are matched to one another such that the gap widens in the manner of a diffuser to the front end.

11. Container for receiving a melt, in which an outflow opening is formed, which is bounded by a boundary wall (1), and the one

Closing stopper for closing the outflow opening, wherein the closure stopper has a closure portion (3) on its outer surface, which is intended to come into contact with a portion of the boundary wall delimiting the outflow opening (1) to close the outflow opening, and the along its longitudinal axis tapers from the closure area to a front end, for that purpose is intended to be introduced into the outflow opening, in particular according to claim 9 or 10, characterized in that the closure plug has at least one of the features of a sealing plug according to one of claims 1 to 8.

12. Use of the sealing plug according to one of claims 1 to 8 with a container for holding a liquid molten metal and / or use of the container according to one of claims 8 to 11 for receiving a liquid molten metal.