DE3211409A1 - Control plate assembly for a slide valve - Google Patents

Description

PATENTANWÄLTE "* DR. ULRICH OSTERTAG DR. REINHARD OSTERTAQ

ElBENWEQ ΙΟ. 700Ο STUTTGART 7O. TELEPHONE Ο711 / 7ββθ43, CABLE: OSPAT

Control disk package for a slide valve

Applicant: Hansa Metallwerke AG

Sigmaringerstr. 107 7000 Stuttgart 81

Legal file: 1208

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description

The invention relates to a control disk package for slide valves, especially in the sanitary sector, with at least two hard material control disks with polished contact surfaces abut one another, are rotatory and / or translationally displaceable relative to one another and at least one of which has at least one passage opening, a surface channel or some other recess for Has passage of a fluid.

Known such control disk packages include two, three and sometimes more control disks, each of which two work together. It is known that the contact surfaces Adjacent control disks must be polished to a high quality, so that the control disks through Adhesive forces are held together; However, it has been found that a certain roughness or Micro structure on the contact surfaces is quite favorable.

Namely, the contact surfaces are polished to a higher quality than necessary to maintain the sealing effect is, the size of the adhesive force as well as the frictional force increases unnecessarily, which has to be applied during the relative displacement of adjacent control disks. Nevertheless has found that sometimes such control disks, which have the ideal microstructure at the contact surfaces have become harder to move against each other over time. In particular, it proves to be disadvantageous that the initial movement of one control disk against the other control disk requires a certain "breakaway force". This often has the consequence that the control disk relative movement overshoots the actually intended goal, so that corrections of the relative position are necessary.

The object of the present invention is to provide a control disc

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benpaket of the type mentioned in such a way that the ease of movement of two adjacent control discs is preserved permanently.

This object is achieved in that the Contact surface of at least one control disk Macrostructure of a plurality of depressions, which are separated from one another by a network of webs.

By means of the macroscopic ones provided according to the invention Depressions, the effective contact area between two adjacent panes is reduced to a fraction of that what with conventionally ground contact surfaces would be given. By the same fraction - assuming the same microstructure door of the remaining contact surface - decrease the forces required to move the discs relative to each other. The contact pressure with which the two control disks are pressed against each other perpendicular to their contact surface can be reduced to the same fraction.

With the recesses proposed according to the invention but not only reduces the effective contact area of the two adjacent control disks; they also pose at the same time long-term reservoirs for a lubricating grease ready.

Even if the grease is exhausted after a very long period of operation, they contribute to lubrication: because they partially fill with water, they still provide very effective water lubrication over the narrow webs away. Dirt particles that penetrate between the control disks are already after a very short relative movement of the two control disks taken from one of these depressions, where they move without impairing the ease of movement of the discs can remain. ■

The effective contact area of the neighboring control

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discs can be further reduced by the fact that in the areas that are not exposed in any relative position, continuous, large-area depressions are provided.

The depressions can be rectangular in plan view. For mechanical stabilization and to reduce the risk of breakage it is advantageous if the webs have walls that diverge from the contact surface.

Also contributing to the mechanical stability of the web is if the recesses are limited by partial spherical surfaces are.

If the macrostructure is provided in a control disk with a passage opening or a surface channel is, the passage opening or the surface channel be bordered by a continuous walkway. This training is chosen when a very precise opening and closing of the slide valve is required by the shortest possible route. 20th

Alternatively, they can be the through opening or the surface channel directly surrounding depressions for the passage opening or be open at the side towards the deflection channel. During this training, the development of noise peaks mitigated in the immediate opening phase of the slide valve that the entire flow of fluid in a multitude of small partial flows is subdivided, which are also opened very sensitively one after the other.

Further noise reduction in intermediate positions of the Slide valve can be achieved in that the contact surface having the macrostructure is against the direction of flow of the fluid flowing through the control disk is directed. The latter does not then bounce more against a plane, but against the one with depressions

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and webs macroscopically roughened control disk surface.

Embodiments of the invention are explained in more detail below with reference to the drawing; show it
5

Fig. 1 is a plan view of the contact surface of a to control disk belonging to a package;

Fig. 2 is a partial section through the control disk of
Fig. 1 on a second belonging to the package

Control disc lying on top;

FIG. 3 is enlarged to scale compared to FIG. 1

Top view of part of the contact surface of a control disk according to a second embodiment

rungsform;

4 shows a section along line IV-3V of FIG. 3;

FIG. 5 is enlarged to scale compared to FIG. 1

Top view of part of the contact surface of a control disk according to a third embodiment;

FIG. 6 shows a section along line VI-VI from FIG. 5.

1 shows the top view of the contact surface of a control disk 1, which belongs to a package of at least two control disks lying one on top of the other and displaceable in a rotational and / or translational manner relative to one another. The control disk 1 shown is circular, but can
have any other outer contour corresponding to the special purpose. The control disk 1 is provided with a passage opening 2, the shape of which is again irrelevant in the present context. Instead of the through

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opening 2 can also be a surface channel act, which takes on the function of a water diversion. Also the number of passage openings or surface channels is irrelevant and can be selected according to the respective field of application. Control disks, after all, that only have the function of opening the openings of a neighboring one To lock or release the control disk, you don't need any through openings or at all To have surface channels.

The contact surface of the control disk 1 is with a plurality covered by small depressions 3, which are separated from one another by a network of webs 4. Also in terms of scope a web 6 is formed on the control disk 1. Finally, in the embodiment shown, the passage opening 2 surrounded by a further web 7, which will be discussed further below.

The surface of the webs 4 is polished to a high quality in a known manner, the level of knowledge being about the optimum The microstructure of the cut can be fully taken into account.

In FIG. 2, the control disk 1 of FIG. 1 partially rests on a second control disk 8 belonging to the package and shown in section. This is a conventional control disk with a macroscopically flat one Contact surface. The control disk 8 is also with a passage opening 9 provided in the illustrated The relative position of the passage opening 2 of the control disk 1 partially overlaps, that is to say is released. the Drawing makes it clear that the interface between the two control disks 1, 8 is only a fraction of what is the case with correspondingly large conventional ones Control disks would result. The same fraction can be used in the illustrated pair of control disks 1, 8 opposite.

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conventional control disks the contact pressure can be reduced, so that the surface pressure required for optimal sealing is retained. The consequence is a considerable theoretically the same fraction of a reduction in the adhesive and frictional forces. In particular the reduction of the static friction forces, possibly also the adhesive forces, increases the ease of use of the Slide valve, in which the control disk package is installed, considerable: the danger that if the two "break loose" Control disks 1.8 is shot out of a rest position beyond the desired new relative position is significant reduced. It is particularly important that the described ease of movement of the control disks 1.8 is permanent. Conventional control disks sometimes lose some of their ease of movement after a certain operating time, possibly after the factory-applied grease has been washed away.

The pockets formed by the depressions 3 and webs 4 also represent a fat reservoir, which provides a fat supply which ensures contact surfaces for a very long time. Even if after this time the The grease supply is exhausted, the depressions 3 contribute to the lubrication: they are then at least partially with water filled and thus enable very effective water lubrication over the narrow webs 4. In the end serve the wells 3 as receiving pockets for the smallest contaminant particles that may be between the Control disks 1, 8 can reach and with conventional control disks practically permanently between them Generation of friction are included. Such particles already arrive in the illustrated control disk package after a short relative displacement of the disks 1, 8 in a pocket formed by a recess 3, where they are without Impact on the ease of movement of the panes remain.

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One that is not associated with the ease of movement of the panes 1, 8 The advantage of the macrostructure consisting of the depressions 3 and webs 4 is also explained with reference to FIG. If the direction of flow of the medium (in particular the water) is the same as that indicated by the arrows Direction coincides, the medium collides with a partially closed passage opening 9 not on a smooth one, but onto a structured surface of the control disk 1. As a result, the partially overlapping with the flow Through openings 2, 9 associated noise development is significantly reduced.

It is well known that particularly loud noises occur in the first opening phase of a slide valve, i.e. when it is the regulating phase The edge of the passage opening 2 of the disc 1 just exceeds the regulating edge of the passage opening 9 of the disc 8. These noise peaks can be combated very effectively by the fact that the the web 7 forming the regular edge is omitted.

The depressions 3 immediately adjacent to the opening 2 then open laterally to this. This has the consequence that the flow flowing in the first opening phase in a Large number of individual flows is divided, which - especially with non-parallel control edges - very sensitive opened one after the other.

The dimensions of the macrostructure formed from the depressions 3 and the webs 4 can vary within wide limits (Figures 1 and 2 exaggerate the size of the macrostructure for purposes of illustration): the principle goes of course that is, the ratio of the area occupied by the depressions 3 to the contact area formed by the webs 4 as large as possible, in order to prevent the adhesion forces acting between the adjacent control disks 1, 8 and to keep frictional forces as small as possible.

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The lower limit for the width of the webs 4, which so far should always be strived for as far as possible is determined by their mechanical stability. The upper limit for the in the dimension of the depressions 3 lying on the contact surface, synonymous with the maximum distance between adjacent webs 4, is due to the smallest distance between adjacent passage openings determined in the adjacent control disk, so that there is no direct water transfer between them can. In general, however, that formed by the depressions 3 is used for reasons of sensitivity of the control Grid be much finer.

What was said above for the maximum distance between the webs 4 does not apply to those areas of the contact surface of the Control disk 1, which are never exposed in the possible relative positions to the control disk 8. Here it is possible to provide continuous, web-free depressions.

The dimensions of the depressions 3 perpendicular to the contact surface, so the actual "depth" are not critical, since it is sufficient if there is no direct contact in this area takes place with the surface of the adjacent control disk 8.

The shape of the depressions need not be rectangular either in plan view or in section. This is shown in the figures, 3 to 6 clearly.

The FIGS. 3 and 4 show a control disk 101, its depressions 103 have the shape of square pyramids. In this way, the ridges 104 receive from the interface made of diverging walls, which increases their resistance to breakage.

The depressions 203 in FIGS. Control disks 201 shown in FIGS. 5 and 6 are hemispherical. This too is the mechanical stability of the between the depressions 203

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remaining webs 204 increased.

In addition, the specific shape of the wells can target the noise development of the Control disks containing slide valve influence can be taken.

The manufacture of the control disks is described by the Macrostructure in no way made difficult or expensive. With the most commonly used ceramic discs, the Macrostructure can already be introduced in the green state by the forming stamp. The subsequent burning of the discs is not made more difficult by this, the grinding and polishing rather easier.

Claims (8)

1208 - 1 - 3/12/82 patent claims 1.' Control disk package for slide valves, in particular in the sanitary area, with at least two hard material control discs with polished contact surfaces abut one another, are rotatory and / or translationally displaceable against one another and of which at least one at least one passage opening, a surface channel or some other recess for Has passage of a fluid, characterized in that the contact surface of at least one Control disk (1; 101; 201) has a macrostructure made up of a multiplicity of depressions (3; 103; 203) which are formed by a network are separated from one another by webs (4; 104; 204). 2. Control disk package according to claim 1, characterized in that in the area of the contact surface of the Control disc (1), which is not exposed in any relative position, continuous, large-area depressions are provided. 3. Control disk package according to claim 1 or 2, characterized in that the recesses (3; 103) in the Are rectangular in plan view.
25th 4. Control disk package according to one of claims 1 to 3, characterized in that the webs (104) of the Have contact surface from diverging walls. 5. control disk package according to claim 1 or 2, characterized characterized in that the depressions (203) are delimited by partial spherical surfaces. 6. control disk package according to one of the preceding claims, characterized in that the macro structure 1208 - 2 - 3/12/82 door (3, 4) in a control disk (1) with a passage opening or a surface channel (2) is provided and the passage opening or the surface channel (2) of one continuous web (7) is lined. 7. control disk package according to one of claims 1 to 5, characterized / that the macrostructure in one Control disk with a passage opening or a surface channel is provided and the depressions directly surrounding the passage opening or the surface channel are laterally open to the passage opening or to the deflection channel. 8. Control disk package according to one of the preceding claims, characterized in that the macrostructure (3, 4) having contact surface against the direction of flow of the fluid flowing through the control disks (1, 2) is directed.