EP3282125A1 - Valve for viscous materials - Google Patents

Abstract

The invention relates to a thick matter valve having a first passage opening (27), a second passage opening (28) and a valve member (32) assigned to the two passage openings (27, 28). The valve member (32) is pivotally mounted relative to a pivot axis (36), wherein the valve member (32) has a concentric with the pivot axis (36) curved sealing surface (38). The valve member (32) releases the first passage opening (27) in a first state (30) and closes the second passage opening (28). The valve member (32) releases the second passage opening (28) in a second state (29) and closes the first passage opening (27). The thick matter valve according to the invention has a simple construction and can be used to generate a continuous stream of material in the direction of an outlet (23) of a slurry pump.

Description

The invention relates to a thick matter valve having a first passage opening, a second passage opening and a valve member which cooperates with both passage openings.

Such valves are used for conveying thick materials, such as fresh concrete or mortar. There is a first conveying state, in which the thick matter passes through the first passage opening, and a second conveying state, in which the thick matter passes through the second passage opening. The thick matter valve serves to release the appropriate passage for the respective passage passage for the thick matter.

Dickstoffventile, in which a valve member is associated with two passage openings are known, see DE 10 2013 215 990 A1 . US 8,827,657 . DE 195 93 986 A1 . DE 10 2005 008 938 A1 , The valve member has the form of an S-shaped pipe section, one end of which can be selectively coupled to the first passage opening or the second passage opening. This is mechanically complicated.

The invention has for its object to introduce a thick matter valve, which is simpler. Based on the cited prior art, the object is achieved with the features of claim 1. Advantageous embodiments are specified in the subclaims.

In the thick matter valve according to the invention the valve member associated with the two passage openings is pivotally mounted relative to a pivot axis and has a concentric with the pivot axis curved sealing surface. In a first state, the valve member releases the first passage opening and closes the second passage opening. In a second state, the valve member releases the second passage opening and closes the first passage opening.

Due to the design according to the invention, there is a simple spatial association between the passage openings and the pivot axis of the valve member, whereby a structurally simple design of the thick matter valve is possible.

Thick cloth is a generic term for media that are difficult to convey. The thick matter may be, for example, a substance with coarse-grained constituents, a substance with aggressive constituents or the like. The thick matter can also be a bulk material. In one embodiment, the thick stock is fresh concrete. Fresh concrete contains grains up to a size of more than 30 mm, binds, forms deposits in dead spaces and is therefore difficult to convey.

The valve member may be disposed in an interior of the slum valve. The thick matter valve according to the invention can be designed so that the thick material enters through the passage openings in the interior of the thick matter valve. The Dickstoffventil may additionally include an output port through which the thick matter entered leaves the valve again. To the output port, a pipe may be connected, through which the further transport of the thick matter takes place. The path between the passage openings and the outlet opening may be arranged so that it does not extend through the valve member.

The first and the second passage opening may each have a sealing surface which is designed to cooperate with the sealing surface of the valve member. The sealing surface can be, for example, an inner surface of a housing of the thick matter valve which extends around the passage opening. The sealing surfaces of the passage openings may have a curvature concentric with the pivot axis of the valve member. Due to the concentric curvature of the cooperating sealing surfaces, the valve member can be rotated about the pivot axis, which corresponds to the axis of the curvature. This makes it possible that one of the openings is freely flowed through, while on the other hand, the sealing surface of the valve member cooperating sealingly with the sealing surface of the other passage opening. The term densities is to be understood with reference to the field of application in which 100% tightness is not required.

In one embodiment, the concentric curvature corresponds to a segment of a cylinder jacket, wherein the cylinder axis is equal to the pivot axis. In this embodiment, the radial distance between the sealing surface of the valve member and the pivot axis over the length of the pivot axis is constant.

Also included are embodiments in which the radial distance varies along the pivot axis. In any case, the curvature in the circumferential direction may correspond to a circle segment.

Between the first passage opening and the second passage opening, an intermediate surface may be arranged, which also has a curvature concentric with the pivot axis. As a result, a continuous contour concentric with the pivot axis can be created, which extends from the first passage opening via the intermediate surface to the second passage opening.

In addition to the aforementioned switching states in which the valve member closes the first or the second passage opening, the thick matter valve may include a third switching state (intermediate state) in which both the first passage opening and the second passage opening are released. In the intermediate state, the valve member may be arranged between the first passage opening and the second passage opening. The distance between the two passage openings can be so large that both passage openings are completely released. This has the advantage that the edges of the sealing surface are not exposed to the flow of material extending through the openings. It is also possible that one or both passage openings are still partially covered by the valve member.

The valve member may comprise a sealing part and a pivoting part, wherein the pivoting part is rotatably mounted in the pivot axis. A motor drive can act on the pivoting part in order to effect the switching operations between the various states of the high-density material valve.

The valve member may include a connecting structure that establishes a connection between the sealing part and the pivoting part. The connection structure may be configured to be rigid with respect to torques that are relative to the pivot axis. Rigid in this sense means that upon rotation of the pivoting member relative to the pivot axis and the sealing member performs the corresponding pivotal movement.

Relative to the radial direction, the connecting structure may allow movement of the sealing part relative to the pivoting part. By such a relative movement of the radial distance between the sealing surface and the pivot axis can be adjusted so that adjusts the desired sealing effect between the valve member and the passage opening.

The connecting structure may comprise an elastic element arranged between the sealing part and the pivoting part. In the initial state of the thick matter valve, the elastic element may be compressed. If wear occurs between the sealing surfaces during operation, the elastic element expands. The wear is thus compensated automatically.

Additionally or alternatively, the valve member of the invention may include a drive to move the sealing member in the radial direction relative to the pivoting member. The drive can be used to adjust the position of the sealing part to the pivoting part in operation. It is also possible to use the drive to adjust the spring tension of the elastic element. The drive may be, for example, a hydraulic drive or a mechanical drive.

In a variant, the valve member comprises a rigid connection between the sealing surface and the pivotably mounted shaft or the pivotally mounted stub shafts. A radial mobility of the sealing surface relative to the valve housing may result from the fact that the shaft or the stub shafts are mounted elastically with respect to the valve housing. For example, one or more elastic elements may be provided that extend around the shaft or stub shafts. This embodiment has the advantage that the elastic elements are not affected by the thick material flow.

The valve member may be arranged in a housing of the high-density material valve according to the invention. The valve member may be disposed adjacent to an end wall of the housing, wherein the end axis is aligned perpendicular to the pivot axis. The pivoting movement of the valve member then runs parallel to the end wall. The valve member may be spaced from the end wall, so that the coarse-grained constituents of the thick matter space between the valve member and the end wall have space. This facilitates the actuation of the valve member.

In an alternative embodiment, the distance between the valve member and the end wall is smaller than the coarse-grained constituents of the thick material. The valve member may include a scratch which pushes the thick matter along the end wall to the side during actuation of the valve member, so that no grains between the valve member and the end wall can be clamped. The scratch may rest on the bulkhead or be slightly away from the bulkhead.

The housing may have a second end wall, so that the valve member between the first and the second end wall is arranged. The interaction between the valve member and the second end wall may be designed accordingly.

A shaft of the valve member may be mounted in the housing of the thick matter valve. In this case, two bearings may be arranged so that they enclose the valve member between them. Between the bearings, a shaft may extend, which is a part of the pivoting part of the valve member.

The thick matter valve according to the invention can be designed such that a straight connecting path between an inlet opening and the outlet opening of the thick matter valve intersects the pivot axis. If a shaft of the valve member extends continuously along the pivot axis, then the flow of material must be guided along a curved path past the shaft.

In order to keep the flow resistance low, the valve member may include a guide surface, with which the flow of material is conducted past the shaft. The baffle may connect to the sealing surface (relative to the direction of movement of the valve member) and define a substantially straight path past the valve member and past the pivot axis. The guide surface may be a planar guide surface, which may be aligned in particular parallel to the pivot axis. At its end adjacent to the exit opening, the guide surface may be provided with a recess to facilitate the passage of material flow into the exit opening. The valve member may comprise two such baffles, the sealing surface being enclosed between the baffles. Depending on the switching state of the valve, the material flow can either be passed along the one and / or the other guide surface along.

Such a guide surface may be particularly advantageous if the valve member is designed so that the pivot axis is enclosed in the body of the valve member. The elastic member of the valve member may extend around the shaft of the valve member or be disposed between the pivot axis and the sealing surface.

In order to keep the flow resistance low, the shaft may comprise two stub shafts, which are guided in bearings of the valve housing. The connection between the two stub shafts can be produced via a connecting structure whose distance from the sealing surface is less than the distance between the pivot axis and the sealing surface. By the connecting structure does not extend along the pivot axis, but is arranged closer to the sealing surface, leaving a space which is available for the flow of material on its way to the outlet opening. In particular, the connection structure may be designed so that a straight line extending from the center of the non-closed passage opening to the center of the outlet opening does not intersect the valve member.

For the connection between the shaft and the sealing part, the connecting structure may comprise a leg which extends to the sealing part. In particular, the leg can be aligned in the radial direction. Based on the sealing part of the leg can be arranged centrally. If the leg has a distance to the end walls of the valve housing, it can be well flowed around by the thick material.

It is also possible that the connecting structure comprises two legs which extend in the direction of the sealing part. The legs may be parallel to each other and aligned in the radial direction. The legs may be arranged so that an area arranged between the pivot axis and the center of the sealing part is kept free, so that it can be flowed through by the thick material. Based on the distance between the pivot axis and the sealing surface of the valve member, the retained region may extend over at least 10%, preferably at least 30%, more preferably at least 50%.

The two legs may have a distance to the end walls of the housing. Alternatively, the legs may be formed as scratches, so that the thick matter is pushed aside on actuation of the valve member along the end face.

If the thick matter valve according to the invention is used in such a way that the material flow enters the interior of the valve through one of the passage openings, extends past the valve member and leaves the valve again through an outlet opening (pumping operation), there is regularly a pressure difference between the interior of the thick matter valve and an outer space, which adjoins the closed with the valve member passage opening. The thick matter valve may be designed so that a force is exerted on the valve member by the pressure difference, which enhances the sealing effect.

If the pressure in the interior is higher than in the outer space, then the valve member can be pressed in the radial direction against the sealing surface of the passage opening. The direction indication radially refers to the pivot axis of the valve member. The valve member may for this purpose comprise an outer surface, by which a pressure applied in the interior pressure is converted into a force acting in the radial direction. Outer surface refers to a portion of the valve member which is in contact with the thick matter in the interior of the slum valve.

In particular, the valve member may have an outer surface which faces the sealing surface. The outer surface may be oriented to intersect the radial direction perpendicularly. A pressure acting on the outer surface is then aligned so that it directly enhances the sealing effect.

It is also possible that the valve member has a relation to the radial direction inclined outer surface, so that only a portion of the compressive force acts in the direction of the sealing surface. The valve member may also have two oppositely oriented inclined outer surfaces. Opposing means that the outer surfaces are aligned so that the components acting in the radial direction of the compressive force add.

If the thick matter valve according to the invention is used in such a way that the material flow flows in the opposite direction (suction operation), the pressure difference can generally not be used in order to increase the sealing effect of the valve member. The sealing effect then results primarily from the force exerted on the sealing part, starting from the pivoting part. As stated, this force can result either from an elastic bias or from an active drive.

The invention also relates to a pump equipped with such a thick matter valve. The thick matter valve can do so be arranged such that in a pumping operation, the offset from the conveying member of the pump in motion material enters through the first and / or the second opening in the interior of the thick matter valve.

The pump may comprise a first delivery cylinder and a second delivery cylinder. In each of the delivery cylinder, a piston may be arranged, which sucks in pumping operation with a backward movement thick matter in the interior of the delivery cylinder and promotes the thick material in the direction of the passage opening of the high-density valve with a forward movement.

The flow rates of the two delivery cylinders can be separated in front of the thick matter valve and combined with the thick matter valve to a common flow. The flow from the first delivery cylinder can enter through the first passage opening of the thick matter valve in the interior of the slum. The flow from the second delivery cylinder can enter through the second passage opening of the thick matter valve in the interior of the slum.

The pistons may be controlled so that the backward movement occurs within a shorter time than the forward movement. The beginning of the forward movement of one piston may overlap with the end of the forward movement of the other piston. There is then a period of time in which both pistons convey material in parallel in the direction of the thick matter valve.

The switching positions of the thick matter valve can be coordinated with the movement of the pistons in the delivery cylinders. is If the piston of the first delivery cylinder in the forward movement and the piston of the second delivery cylinder in the backward movement, so the sludge valve can be switched to the first state in which the first passage opening is free and the second passage opening is closed. If the piston of the second delivery cylinder is in the forward movement and the piston of the first delivery cylinder is in the backward movement, then the thick matter valve can be switched to the second state, in which the second passage opening is free and the first passage opening is closed. In the intermediate phase, in which the pistons of both delivery cylinders are in the forward movement, the sludge valve can be switched to a state in which none of the passage openings is closed. Preferably, both passage openings are free in this intermediate state of the thick matter valve.

If the piston of the first delivery cylinder is in the backward movement and the piston of the second delivery cylinder is in the forward movement, then there is a pressure difference across the first passage of the thick matter valve. The pressure in the interior of the thick matter valve substantially corresponds to the pressure exerted by the piston of the second delivery cylinder with its forward movement on the material. Before the first passage opening, the suction pressure of the first delivery cylinder is located, which is much lower. This pressure difference can be used as described above to enhance the sealing effect between the valve member and the first passage opening. Conversely, when the piston of the second delivery cylinder in the backward movement and the piston of the first delivery cylinder in the forward movement, so is the corresponding pressure difference across the first opening of the slum valve on.

For a switching operation of the thick matter valve overlying the valve member pressure difference is a hindrance. The thick matter valve can therefore be set up so that the switching operation takes place when there is a pressure difference across the valve member which is reduced in relation to this pressure difference. For this purpose, it is advantageous if the switching operation takes place only when the rearward movement of the piston is completed, the passage opening is closed with the valve member. It may also be advantageous that the switching process takes place only when the piston in question has begun its forward movement, so that a pressure has already been built up again before the respective passage opening.

The thick matter valve may be arranged to complete the shift operation before the reverse movement of the other piston begins. In particular, the thick matter valve may be arranged so that the switching operation is completed before the forward movement of the other piston is completed. The switching operation can be designed so that the valve member is moved from a first switching state, in which one of the passage openings is closed and the other passage opening is free, via an intermediate state, in which none of the passage openings is closed, into a second switching state, in which the respective other passage opening is closed or free. In particular, the pump may be configured so that the switching operations of the valve member are only made when the pressure difference across the valve member is small.

The above statements relate to the pumping operation of the pump. The pump can also be reversed be operated in a suction mode. The suction operation can serve, for example, to clean the thick matter valve and a subsequent delivery line or to eliminate clogging in this area. The interaction of the delivery cylinder and the thick matter valve is then matched in a reverse manner to each other.

In suction operation, a pressure difference across the valve member regularly tends to reduce the sealing effect of the valve member. The valve member should therefore be designed so that it has a sufficient sealing effect even under such a negative pressure difference by a force acting in the direction of the passage opening force is exerted on the sealing member via the pivoting part.

Fig. 1:

ein Fahrzeug mit einer Dickstoffpumpe, das mit einem erfindungsgemäßen Dickstoffventil ausgestattet ist;

Fig. 2:

ein Blockschaltbild einer mit einem erfindungsgemäßen Dickstoffventil ausgestatteten Dickstoffpumpe (in Hydrauliknotation);

Fig. 3:

eine perspektivische Darstellung einer Dickstoffpumpe mit einem erfindungsgemäßen Dickstoffventil;

Fig. 4:

eine Schnittdarstellung der Pumpe gemäß Fig. 3;

Figuren 5

bis 8: schematische Darstellungen verschiedener Zustände der Dickstoffpumpe gemäß Fig. 3;

Fig. 9:

eine schematische Darstellung eines erfindungsgemäßen Ventilglieds;

Fig. 10:

eine Darstellung der auf das Dichtteil des Ventilglieds wirkenden Drücke;

Fig. 11:

ein Ventilglied eines erfindungsgemäßen Dickstoffventils in teilweise geschnittener Darstellung;

Figuren 12 und 13:

Ventilglieder in alternativen Ausführungsformen der Erfindung; und

Fig. 14

eine Schnittdarstellung der Ausführungsform gemäß Fig. 13.

The invention will now be described by way of example with reference to the accompanying drawings, given by way of advantageous embodiments. Show it:

Fig. 1:

a vehicle with a sludge pump, which is equipped with a slender valve according to the invention;

Fig. 2:

a block diagram of an equipped with a thick matter valve according to the invention thick matter pump (in hydraulic notation);

3:

a perspective view of a sludge pump with a slender valve according to the invention;

4:

a sectional view of the pump according to Fig. 3 ;

Figures 5

to 8: schematic representations of various states of the sludge pump according to Fig. 3 ;

Fig. 9:

a schematic representation of a valve member according to the invention;

Fig. 10:

an illustration of the forces acting on the sealing part of the valve member pressures;

Fig. 11:

a valve member of a thick matter valve according to the invention in a partially sectioned representation;

FIGS. 12 and 13:

Valve members in alternative embodiments of the invention; and

Fig. 14

a sectional view of the embodiment according to Fig. 13 ,

On the back of a in Fig. 1 shown truck 14 is a slurry pump 15 is arranged in the form of a concrete pump. The slurry pump 15 includes a prefill container 16 into which the concrete from a supply (not shown) is filled. The sludge pump 15 sucks in the concrete from the prefill container and conveys the concrete through a connection pipe 17 which extends along a distribution boom 18. The distribution boom 18 is mounted on a turntable 19 and can be folded over a plurality of joints, so that the end of the tube 17 can be brought into a spaced from the truck 14 position. In this position, the concrete is discharged from the connection pipe 17.

The slurry pump comprises according to Fig. 2 a first conveyor cylinder 21 and a second conveyor cylinder 22. Each conveyor cylinder 21, 22 comprises a piston which sucks in a backward movement concrete from the Vorfüllbehälter 16 and conveys the concrete with a forward movement in the direction of an outlet 23 of the pump.

The first delivery cylinder 21 is associated with a first inlet valve 24. The intake valve 24 is opened during the backward movement of the first delivery cylinder 21, so that the delivery cylinder 21 can suck in concrete from the Vorfüllbehälter 16. The inlet valve 24 is closed during the forward movement of the first delivery cylinder 21, so that the concrete in Direction pump outlet 23 can be promoted. The second delivery cylinder 22 is associated with a second inlet valve 25, the switching operations are matched to the backward and forward movements of the second delivery cylinder 22 accordingly.

The pump comprises a thick matter valve 26, which forms a common outlet valve for the first delivery cylinder 21 and the second delivery cylinder 22. The thick matter valve 26 comprises a first passage opening 27 for concrete conveyed with the first delivery cylinder 21 and a second passage opening 28 for concrete conveyed with the second delivery cylinder 22. A valve member 32 of the thick matter valve closes in a first switching state 29, the first passage opening 27 and leaves the second passage opening 28 open. In a second switching state 30, the thick matter valve 26 closes the second passage opening 28 and leaves the first passage opening 27 open. In a third switching state 31 (intermediate state) both passage openings 27, 28 are open.

The two conveyor cylinders 21, 22 are driven so that the backward movement takes place within a shorter period of time than the forward movement. The beginning of the forward movement of the one delivery cylinder overlaps with the end of the forward movement of the other delivery cylinder. At any time, therefore, at least one of the delivery cylinders 21, 22 conveys concrete in the direction of the thick matter valve 26.

The valve member 32 of the thick matter valve 26 is actively switched by a drive between the various switching states. If the first delivery cylinder 21 in the forward movement and the second delivery cylinder 22 in the backward movement, then the thick matter valve 26 is in the switching state 30, in which only the material flow coming from the first delivery cylinder 21 can pass through the thick matter valve 26. If the second delivery cylinder 22 in the forward movement and the first delivery cylinder 21 in the backward movement, the sludge valve 26 is in the switching state 29, in which only the coming of the second delivery cylinder 20 material flow can pass through the sludge valve 26. In the overlapping phase, in which both conveying cylinders 21, 22 are in the forward movement, the thick matter valve 26 is in the intermediate state 31, in which the material flows from both delivery cylinders 21, 22 can pass through the thick matter valve 26.

Both conveyor cylinders 21, 22 have a basic speed for the forward movement. The basic speed of the forward movement is used, while the respective other conveyor cylinder 21, 22 in the backward movement. By the basic speed of the material flow is defined, which is promoted in this phase towards the pump outlet 23. In the overlapping phase, in which both conveyor cylinders 21, 22 are in the forward motion, the speed is reduced from the base speed so that the speeds of the two forward motions add up to the basic speed. In this way, a constant flow of material towards the pump outlet 23 is maintained even during the overlapping phase.

The Fig. 3 shows the sludge pump according to the invention in a perspective view. The inlet valve 25 is in the open state, so that the associated inlet opening 45 of the pump is continuous and that with the second delivery cylinder 22 thick material from the Vorfüllbehälter 16 (FIG. Fig. 1 ) can be sucked. The first inlet valve 24 is in the closed Status. When the piston of the first delivery cylinder 21 is in forward motion, the material flow moves through the first passage 27 of the slurry valve 26 towards the pump outlet 23, see Fig. 4 ,

The sequence in the operation of the pump is described below with reference to the schematic representations of FIGS. 5 to 8 explained. In Fig. 5A the valve member 32 of the thick matter valve 26 is connected so that it closes the passage opening 27 of the first delivery cylinder 21 and that it leaves open the passage opening 28 of the second delivery cylinder 22. The inlet valve 25 of the second delivery cylinder 22 is closed, see Fig. 5B , The second delivery cylinder 22 is in the forward movement and conveys concrete through the passage opening 28 in the interior of the thick matter valve 26 and the pump outlet 23. By the pressure applied across the valve member 32 pressure difference between the valve member 32 and the passage opening 27 is amplified. The inlet valve 24 of the first delivery cylinder 21 is opened so that the first delivery cylinder 21 can suck in concrete from the prefill container 16 with a backward movement through the inlet port 44 of the pump.

The backward movement of the first delivery cylinder 21 ends earlier than the forward movement of the second delivery cylinder 22 Fig. 6 the state is shown in which the forward movement of the first delivery cylinder 21 begins and the forward movement of the second delivery cylinder 22 is just before the end. Both inlet valves 24, 25 are closed. The switching of the thick matter valve 26 in the intermediate state 31 begins after the first delivery cylinder 21 has already built up pressure in front of the passage opening 27, so that above the valve member 32 only a slight pressure difference is applied. After switching, the thick matter valve 26 in the intermediate state 31, in which the valve member 32 leaves free both the first passage opening 27 and the second passage opening 28. In both delivery cylinders 21, 22, the speed of the forward movement is reduced, so that the delivery cylinder 21, 22 now jointly promote the amount of material that has previously promoted the second delivery cylinder 22 alone.

After the end of the forward movement of the second delivery cylinder 22, the intake valve 25 is opened, see Fig. 7 , For pressure relief, the second delivery cylinder 22 may already perform a first backward movement before opening the inlet valve 25. When the inlet valve 25 is opened, the second delivery cylinder 22 sucks concrete from the prefill container 16 with a backward movement through the inlet port 45 of the pump. The first delivery cylinder 21 moves forward at its basic speed, so that the flow of material to the pump outlet 23 remains unchanged.

In Fig. 8 Again, the forward movement of the second delivery cylinder 22 begins, while the forward movement of the first delivery cylinder 21 ends. With the end of the forward movement of the first delivery cylinder 21, the cycle ends and the pump returns to the state according to Fig. 5 above.

The valve member 32 of the thick matter valve 26 comprises according to Fig. 9 a pivoting part 34 and a sealing part 35. The pivoting part 34 comprises two sections of a shaft 33, via which the pivoting part is rotatably mounted relative to a pivot axis 36. Between the shaft 33 and the sealing part 35 is an in Fig. 9 only schematically illustrated connection structure 48 is formed. Via the connecting structure 48, the radial distance between the sealing part 35 and the shaft 33 can be changed.

By contrast, the connecting structure 48 is rigid with respect to torques. Thus, if the shaft is rotated by a certain angle, the sealing part 35 performs a pivoting movement by the same angle.

The underside of the sealing part 35 forms a sealing surface 38 in the form of a concentric with the pivot axis 36 aligned cylinder segment. The housing of the thick matter valve 26 has a matching mating surface, which also has the shape of a cylinder segment. In the mating surface, the passage openings 27, 28 of the thick matter valve 26 are formed. The sealing surface 38 of the valve member 32 cooperates with the counter surface of the valve housing and can depending on the switching state either the passage opening 27 or the passage opening 28 seal.

In Fig. 10 is a state of the thick matter valve shown, in which a higher pressure is applied in the interior of the thick matter valve than in front of the passage opening 27, which is closed with the sealing part 35. The valve member 32 has a sealing surface 38 opposite outer surface 43, on which the pressure of the material in the sludge 26 material acts in the radial direction. The pressure difference from the outside helps to enhance the sealing effect between the valve member 32 and the valve housing. The valve member 32 also has two symmetrically arranged outer surfaces 44, 45. An acting on the outer surfaces 44, 45 pressure of the material also has a component in the radial direction, so that the outer surfaces 44, 45 contribute to enhance the sealing effect.

At the in Fig. 11 shown valve member 32, the pivot member 34 comprises a pin 50 which engages in a matching recess of the sealing part 35. With the pin 50, a sliding guide is formed, along which the sealing member 35 can move in the radial direction relative to the shaft 33. Compared to forces in other directions, the sliding guide is rigid.

Between the pivoting part 34 and the sealing part 35, a plate 37 is arranged made of an elastic material. The plate 37 is part of the connecting structure between the pivot member 34 and the sealing member 35. By pressure in the radial direction, the plate 37 can be elastically compressed, whereby the sealing member 35 is approximated along the sliding guide to the pivot member 34.

The thick matter valve 26 according to the invention is set up in the delivery state such that the plate 37 is elastically compressed and consequently the sealing part 35 bears against the valve housing under an elastic pressure which the plate 37 exerts in the radial direction. If there is wear of the valve member 32 or the valve housing during operation of the pump, it can be compensated automatically by expansion of the elastic plate 37. In the suction operation is ensured by the plate 37 that a sufficient contact pressure sealing member 35 and the valve housing.

This in Fig. 11 shown valve member 32 is also designed so that between two stub shafts 33 a clearance is included, so that the material flow can move directly from the passage openings 27, 28 in the direction of the pump outlet 23. The pivoting part 34 comprises two legs 51, 52, which extend in the radial direction and which enclose the space between them. In the radial direction, the free space extends over more than 50% of the distance between the pivot axis 36 and the sealing surface 38.

In the embodiment according to Fig. 12 is also enclosed between two stub shafts 33 a clearance to facilitate the movement of the flow in the direction of the outlet opening. A central leg 53 extends in the radial direction and is centrally connected to the sealing part 35. Around the leg 53 there is sufficient space for the movement of the flow of material. Incidentally, the connection structure is analogous to Fig. 11 designed with an elastic plate 37 and an in Fig. 12 invisible sliding guide.

In Fig. 13 an alternative embodiment of a valve member 32 according to the invention is shown. The sealing part 35 extends around the pivoting part 34, so that a portion of the pivoting part 34 is received in the interior of the sealing part. According to the sectional view in Fig. 14 has the pivot member 34 in the interior of the sealing member 35 has a rectangular cross-section. The sealing member 35 has a matching to the rectangular cross-section slot in which above and below the pivot member 34 elastic members 37 are arranged so that the sealing member 35 can move in the radial direction relative to the pivot member 34, while a relative rotational movement between the sealing member 35th and the pivoting part 34 is excluded. The pivot member 34 includes a lever 39 to which a drive can engage to switch the valve member 32 between the various switching states.

The valve member 32 is dimensioned so that it with its two axially facing end faces directly to the housing 46 of the thick matter valve 26 is present. The end faces of the valve member are formed as scratches 55. The scratches 55 push in a switching operation of the valve member 32, the thick matter along the end face of the housing to the side.

The side surfaces 57 of the valve member are designed as guide surfaces. Along the baffles, the flow of material is directed towards the exit port of the thick matter valve. At its upper side, the valve member 32 is provided with a recess 56, through which the movement of the material flow in the direction of the outlet opening is facilitated.

Claims (15)

Thick-type valve having a first passage opening (27), with a second passage opening (28) and with a valve member (32) assigned to the two passage openings (27, 28), wherein the valve member (32) is pivotably mounted relative to a pivot axis (36), wherein the valve member (32) has a concentric with the pivot axis (36) curved sealing surface (38), and wherein the valve member (32) in a first state (30), the first passage opening (27) releases and the second passage opening (28) closes and wherein the valve member (32) in a second state (29) releases the second passage opening (28) and closes the first passage opening (27). Thick-matter valve according to claim 1, characterized in that the valve member (32) is arranged in an inner space of the high-density material valve. Thick-matter valve according to one of claims 1 to 2, characterized in that between the first passage opening (27) and the second passage opening (28) an intermediate surface is arranged, which has a to the pivot axis (36) concentric curvature. Density valve according to one of claims 1 to 3, characterized in that in a third switching state, the valve member (32) between the first passage opening (27) and the second passage opening (28) is arranged. Thickened matter valve according to one of claims 1 to 4, characterized in that the valve member (32) comprises a sealing part (35) and a pivoting part (34), wherein the pivoting part (34) is rotatably mounted in the pivot axis (36) and wherein the sealing part (35) is connected via a connecting structure (37) with the pivoting part (34). Thickness valve according to claim 5, characterized in that the connecting structure (37) is rigid relative to relative to the pivot axis (36) acting torques. Density valve according to claim 5 or 6, characterized in that the connecting structure (37) in the radial direction allows movement of the sealing part (35) relative to the pivoting part (34). Thick-matter valve according to one of claims 5 to 7, characterized in that the connecting structure comprises a between the sealing part (35) and the pivot member (34) arranged elastic element (37). Valve according to claim 5 or 6, characterized in that between a shaft (33) of the valve member (32) and a housing (46) of the valve is an elastic element. Thickening valve according to one of claims 1 to 9, characterized in that the valve member (32) comprises two in the pivot axis (36) mounted stub shaft (33) and that the stub shafts (33) include a free space between them. Thick-matter valve according to one of claims 1 to 10, characterized in that the valve member (32) comprises a leg (51, 52, 53) extending between the pivot axis (36) and the sealing surface (38) extends, and that the leg (51, 52, 53) from an end face of a housing (46) of the thick matter valve (26) is spaced. Density valve according to one of claims 1 to 10, characterized in that the valve member (32) has a scratch (55), which is guided in a switching operation of the valve member (32) along an end face of the housing (46) of the high-density valve (26). Thick-matter valve according to one of claims 1 to 12, characterized in that the valve member (32) comprises an outer surface (43, 44, 45), by which a via valve member (32) applied pressure difference is converted into a force acting in the radial direction. Slurry pump with a thick matter valve according to one of claims 1 to 13, characterized in that the material displaced by a conveying member of the pump in the material entering through the first and / or second inlet opening (27, 28) in the interior of the slum. A high-solids pump according to claim 14, characterized in that switching between states of the thick matter valve (26), when no pressure difference across the valve member (32) is applied.

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