EP3497329B1 - Valve for viscous materials - Google Patents

Description

The invention relates to a thick substance valve with a first passage opening, a second passage opening and with a valve member which interacts with both passage openings.

Such valves are used when 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 condition in which the thick matter passes through the second passage opening. The thick matter valve serves to open the passage opening for the thick matter suitable for the respective conveying state.

Thick matter valves in which a valve member is assigned two through 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 shape of an S-shaped tube section, one end of which can optionally be coupled to the first passage opening or the second passage opening. This is mechanically complex. document BE 903 984 A presents a pump with two cylinders, a valve chamber and a valve, the valve may be a butterfly valve and the valve chamber may be rectangular.

The invention has for its object to present a thick material valve that is of simple construction. Based on the prior art mentioned, the problem is solved 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 assigned to the two passage openings is pivotably mounted with respect to a pivot axis and has a sealing surface that is curved concentrically to the pivot axis. 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 clears the second passage opening and closes the first passage opening. In a variant of the invention, the valve member comprises a sealing part and a swivel part. The swivel part is rotatably mounted in the swivel axis. The sealing part is connected to the swivel part via a connecting structure.

As a result of the design according to the invention, there is a simple spatial association between the passage openings and the pivot axis of the valve member, as a result of which a structurally simple design of the thick material valve is possible. If the sealing part is connected to the swivel part via a connecting structure, a reliable sealing effect can be achieved between the sealing part and the passage openings.

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

The valve member can be arranged in an interior of the thick matter valve. The thick matter valve according to the invention can be designed such that the thick matter enters the interior of the thick matter valve through the passage openings. The thick matter valve can additionally comprise an outlet opening through which the thick matter that has entered leaves the valve again. A tube can be connected to the outlet opening, through which the further transport of the thick matter takes place. The path between the passage openings and the outlet opening can be arranged such that it does not extend through the valve member.

The first and the second passage opening can 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 material valve, which extends around the passage opening. The sealing surfaces of the passage openings can have a curvature which is 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 for one of the openings to be freely flowable, while on the other hand the sealing surface of the valve member interacts in a sealing manner with the sealing surface of the other passage opening. The term sealing is to be understood with reference to the area of application in which 100% tightness is not required.

In one embodiment, the concentric curvature corresponds to a segment of a cylinder jacket, the cylinder axis being equal to the pivot axis. In this embodiment, the radial distance between the sealing surface of the valve member and the pivot axis constant over the length of the pivot axis. Embodiments are also included in which the radial distance varies along the pivot axis. In any case, the curvature can correspond to a segment of a circle in the circumferential direction.

An intermediate surface can be arranged between the first passage opening and the second passage opening, which also has a curvature concentric to the pivot axis. As a result, a continuous contour can be created which is concentric with the pivot axis and extends from the first passage opening over the intermediate surface to the second passage opening.

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

The valve member can comprise a sealing part and a swivel part, the swivel part being rotatably mounted in the swivel axis. A motor drive can act on the swivel part in order to effect the switching operations between the various states of the thick matter valve.

The valve member may include a connection structure that establishes a connection between the sealing part and the pivoting part. The connection structure can be designed in such a way that it is rigid with respect to torques which act relative to the pivot axis. Rigid in this sense means that when the swivel part rotates relative to the swivel axis, the sealing part also performs the corresponding swivel movement.

In relation to the radial direction, the connecting structure can allow the sealing part to move relative to the pivoting part. With such a relative movement, the radial distance between the sealing surface and the swivel axis can be adjusted so that the desired sealing effect is established between the valve member and the passage opening.

The connecting structure can 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 can be compressed. If wear occurs between the sealing surfaces during operation, the elastic element expands. Wear is automatically compensated for.

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

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

The valve member can be arranged in a housing of the thick matter valve according to the invention. The valve member can be arranged adjacent to an end wall of the housing, the end axis being oriented at right angles to the pivot axis. The pivoting movement of the valve member then runs parallel to the end wall. The valve member can be spaced from the end wall so that there is also space for the coarse-grained components of the thick material between the valve member and the end wall. 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 components of the thick material. The valve member may include a scratch that pushes the thick material to the side along the end wall when the valve member is actuated, so that no grains can be pinched between the valve member and the end wall. The scratch can rest on the end wall or be a slight distance from the end wall.

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

A shaft of the valve member can be mounted in the housing of the thick matter valve. Two bearings can be arranged so that they enclose the valve member between them. A shaft, which is part of the pivoting part of the valve member, can extend between the bearings.

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 swivel axis, the material flow must be guided past the shaft along a curved path.

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

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

In order to keep the flow resistance low, the shaft can comprise two shaft ends, which are guided in bearings in the valve housing. The connection between the two shaft ends can be established via a connection structure, the distance from which to the sealing surface is less than the distance from the pivot axis to the sealing surface. Because the connection structure does not extend along the pivot axis, but rather is arranged closer to the sealing surface, there remains a free space which is available for the material flow on its way to the exit opening. In particular, the connection structure can be designed such that a straight line that extends from the center of the unlocked 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 connection structure can comprise a leg which extends to the sealing part. In particular, the leg can be aligned in the radial direction. Relative to the sealing part, the leg can be arranged in the center. If the leg is at a distance from the end walls of the valve housing, the thick material can flow around it well.

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

The two legs can be at a distance from the end walls of the housing. Alternatively, the legs can be designed as scratches, so that the thick material is pushed aside along the end face when the valve member is actuated.

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 through an outlet opening (pump operation), there is regularly a pressure difference between the interior of the thick matter valve and to an outside space, which adjoins the passage opening closed with the valve member. The thick matter valve can be designed such that a force is exerted on the valve member by the pressure difference, which strengthens the sealing effect.

If the pressure in the interior is higher than in the exterior, the valve member can be pressed in the radial direction against the sealing surface of the passage opening. The radial direction relates to the pivot axis of the valve member. The valve member can for this purpose comprise an outer surface through which a pressure applied in the interior is converted into a force acting in the radial direction. Outer surface denotes an area of the valve member which is in contact with the thick material in the interior of the thick material valve.

In particular, the valve member can have an outer surface that lies opposite the sealing surface. The outer surface can be oriented so that it intersects the radial direction perpendicularly. A pressure acting on the outer surface is then oriented so that it directly reinforces the sealing effect.

It is also possible for the valve member to have an outer surface that is inclined with respect to the radial direction, so that only a portion of the compressive force acts in the direction of the sealing surface. The valve member can also have two oppositely oriented inclined outer surfaces. Counter-rotating means that the outer surfaces are aligned so that the components of the compressive force acting in the radial direction add up.

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 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 pretension or from an active drive.

The invention also relates to a pump equipped with such a thick matter valve. The thick matter valve can be arranged in such a way that in a pumping operation that of the delivery member material set in motion by the pump enters the interior of the thick matter valve through the first and / or the second opening.

The pump can comprise a first delivery cylinder and a second delivery cylinder. A piston can be arranged in each of the feed cylinders, which in suction mode sucks thick matter into the interior of the feed cylinder with a backward movement and which feeds the thick matter in the direction of the passage opening of the thick matter valve with a forward movement.

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

The pistons can be controlled in such a way that the backward movement takes place within a shorter period of time than the forward movement. The start 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 the direction of the thick matter valve in parallel.

The switching positions of the thick matter valve can be coordinated with the movement of the pistons in the delivery cylinders. The piston of the first feed cylinder is in the forward movement and the piston of the second feed cylinder is in the backward movement, the thick matter 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, 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 thick matter valve can be switched into a state in which none of the through openings is closed. Both through openings are preferably free in this intermediate state of the thick material 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, there is a pressure difference across the first passage opening of the thick matter valve. The pressure in the interior of the thick matter valve essentially corresponds to the pressure that the piston of the second feed cylinder exerts on the material with its forward movement. The suction pressure of the first delivery cylinder, which is significantly lower, is present in front of the first passage opening. This pressure difference can be used as described above to increase the sealing effect between the valve member and the first passage opening. Conversely, if the piston of the second delivery cylinder is in the backward movement and the piston of the first delivery cylinder is in the forward movement, then the corresponding pressure difference is present across the first opening of the thick matter valve.

For a switching operation of the thick matter valve, a pressure difference across the valve member is a hindrance. The thick matter valve can therefore be set up in such a way that the switching process takes place when there is a pressure difference above the valve member which is reduced compared to this pressure difference. For this purpose, it is advantageous if the switching process only takes place when the backward movement of the piston is completed, the passage opening of which is closed by the valve member. It can also be advantageous that the switching process only takes place when the piston in question has started its forward movement, so that a pressure has already been built up again in front of the passage opening in question.

The thick matter valve can be set up so that the switching process is completed before the backward movement of the other piston begins. In particular, the thick matter valve can be set up in such a way that the switching process is completed before the forward movement of the other piston has ended. The switching process can be designed such 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, to an intermediate state, in which none of the passage openings is closed, in a second switching state, in which the other passage opening is closed or free. In particular, the pump can be set up in such a way that the switching operations of the valve member are only carried out when the pressure difference across the valve member is small.

The above statements refer to the pump operation of the pump. The pump can also be operated in the reverse direction in a suction mode. The suction operation can serve, for example, to clean the thick matter valve and an adjoining delivery line or to remove a blockage in this area. The interplay of the delivery cylinder and the thick matter valve is then coordinated with one another in the reverse manner.

In suction operation, a pressure difference across the valve member tends to reduce the sealing effect of the valve member. The valve member should therefore be designed such that it has a sufficient sealing effect even under such a negative pressure difference, in that a force acting in the direction of the passage opening is exerted on the sealing part 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 is described below with reference to the accompanying drawings using exemplary embodiments. Show it:

Fig. 1:

a vehicle with a thick matter pump, which is equipped with a thick matter valve according to the invention;

Fig. 2:

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

Fig. 3:

a perspective view of a thick matter pump with a thick matter valve according to the invention;

Fig. 4:

a sectional view of the pump Fig. 3 ;

Figures 5 to 8:

schematic representations of different states of the thick matter pump according to Fig. 3 ;

Fig. 9:

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

Fig. 10:

a representation of the pressures acting on the sealing part of the valve member;

Fig. 11:

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

Figures 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 one in Fig. 1 shown truck 14, a thick matter pump 15 is arranged in the form of a concrete pump. The thick matter pump 15 comprises a prefilling container 16, into which the concrete is poured from a supply (not shown). The thick matter pump 15 sucks the concrete out of the prefilling container and conveys the concrete through a connecting pipe 17 which extends along a distribution boom 18. The placing boom 18 is mounted on a slewing ring 19 and can be folded out over several joints, so that the end of the tube 17 can be brought into a position spaced apart from the truck 14. In this position, the concrete is brought out of the connecting pipe 17.

The thick matter pump comprises according to Fig. 2 a first feed cylinder 21 and a second feed cylinder 22. Each feed cylinder 21, 22 comprises a piston which sucks concrete out of the prefilling container 16 with a backward movement and which conveys the concrete towards an outlet 23 of the pump with a forward movement.

A first inlet valve 24 is assigned to the first feed cylinder 21. The inlet 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 prefilling container 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 feed cylinder 22 is assigned a second inlet valve 25, the switching operations of which are matched to the backward and forward movements of the second feed cylinder 22.

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. In a first switching state 29, a valve member 32 of the thick material valve closes 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 feed 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 one delivery cylinder overlaps with the end of the forward movement of the other delivery cylinder. Concrete is conveyed in the direction of the thick matter valve 26 by at least one of the delivery cylinders 21, 22 at all times.

The valve member 32 of the thick matter valve 26 is actively switched between the different switching states via a drive. If the first feed cylinder 21 is in the forward movement and the second feed cylinder 22 is in the backward movement, the thick matter valve 26 is in the switching state 30, in which only the material flow coming from the first feed cylinder 21 can pass through the thick matter valve 26. If the second feed cylinder 22 is in the forward movement and the first feed cylinder 21 is in the backward movement, the thick matter valve 26 is in the switching state 29 in which only the material flow coming from the second feed cylinder 22 can pass through the thick matter valve 26. In the overlapping phase, in which both delivery 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 feed cylinders 21, 22 have a basic speed for the forward movement. The basic speed of the forward movement is used while the other feed cylinder 21, 22 is in the backward movement. The material flow, which is conveyed in the direction of the pump outlet 23 in this phase, is defined by the basic speed. In the overlapping phase, in which both delivery cylinders 21, 22 are in the forward movement, the speed is reduced compared to the basic speed in such a way that the speeds of the two forward movements add up to the basic speed. In this way, a constant material flow in the direction of the pump outlet 23 is maintained even during the overlap phase.

The Fig. 3 shows the thick matter 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 thick matter from the prefilling container 16 ( Fig. 1 ) can be sucked in. The first inlet valve 24 is closed Status. When the piston of the first delivery cylinder 21 is in the forward movement, the material flow moves through the first passage opening 27 of the thick matter valve 26 in the direction of the pump outlet 23, see Fig. 4 .

The sequence in the operation of the pump is described below using the schematic diagrams of Figures 5 to 8 explained. In Figure 5A the valve member 32 of the thick matter valve 26 is switched such that it closes the passage opening 27 of the first delivery cylinder 21 and that it leaves the passage opening 28 of the second delivery cylinder 22 open. The inlet valve 25 of the second feed cylinder 22 is closed, see Figure 5B . The second delivery cylinder 22 is in the forward movement and conveys concrete through the passage opening 28 into the interior of the thick matter valve 26 and to the pump outlet 23. The sealing effect between the valve member 32 and the passage opening 27 is increased by the pressure difference applied across the valve member 32. The inlet valve 24 of the first delivery cylinder 21 is open, so that the first delivery cylinder 21 can suck concrete out of the prefilling container 16 with a backward movement through the inlet opening 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. In 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 close to the end. Both inlet valves 24, 25 are closed. The switching of the thick substance valve 26 into 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 there is only a slight pressure difference across the valve member 32. After switching, the thick matter valve is 26 in the intermediate state 31, in which the valve member 32 leaves both the first passage opening 27 and the second passage opening 28 free. The speed of the forward movement is reduced in the case of both delivery cylinders 21, 22, so that the delivery cylinders 21, 22 now together convey the amount of material that the second delivery cylinder 22 alone previously transported.

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

In Fig. 8 begins the forward movement of the second feed cylinder 22 again, while the forward movement of the first feed 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 about.

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

In contrast, the connection structure 48 is rigid with respect to torques. If the shaft is rotated through a certain angle, the sealing part 35 performs a pivoting movement through the same angle.

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

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

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

A plate 37 made of an elastic material is arranged between the pivoting part 34 and the sealing part 35. The plate 37 is part of the connection structure between the swivel part 34 and the sealing part 35. The pressure in the radial direction enables the plate 37 to be elastically compressed, as a result of which the sealing part 35 is brought closer to the swivel part 34 along the sliding guide.

The thick matter valve 26 according to the invention is set up in the delivery state in such a way that the plate 37 is elastically compressed and the sealing part 35 consequently rests under an elastic pressure on the valve housing which the plate 37 exerts in the radial direction. If the valve member 32 or the valve housing is worn during operation of the pump, this can be compensated for automatically by expanding the elastic plate 37. In suction operation, the plate 37 ensures that there is sufficient contact pressure between the sealing part 35 and the valve housing.

This in Fig. 11 The valve member 32 shown is also designed such that a space is enclosed between two shaft ends 33, so that the material flow can move directly from the passage openings 27, 28 in the direction of the pump outlet 23. The pivot part 34 comprises two legs 51, 52 which extend in the radial direction and which enclose the free space between them. Extends 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 a space is also enclosed between two shaft ends 33 in order to facilitate the movement of the delivery 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. There is sufficient space around the leg 53 for the movement of the material flow. Otherwise, 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 swivel part 34, so that a portion of the swivel part 34 is received in the interior of the sealing part. According to the sectional view in Fig. 14 the swivel part 34 has a rectangular cross section in the interior of the sealing part 35. The sealing part 35 has a slot matching the rectangular cross section, in which elastic elements 37 are arranged above and below the pivoting part 34, so that the sealing part 35 can move in the radial direction relative to the pivoting part 34, while a relative rotational movement between the sealing part 35 and the swivel part 34 is excluded. The pivoting part 34 comprises a lever 39, on which a drive can engage in order to switch the valve member 32 between the different switching states.

The valve member 32 is dimensioned such that it rests with its two end faces pointing in the axial direction directly on the housing 46 of the thick material valve 26. The end faces of the valve member are designed as scratches 55. The scratches 55 push the thick material aside along the end face of the housing during a switching operation of the valve member 32.

The side surfaces 57 of the valve member are designed as guide surfaces. The material flow is directed along the guide surfaces in the direction of the outlet opening of the thick matter valve. On 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 (14)

1. Thick stock valve with a first through opening (27), with a second through opening (28) and with a valve member (32) associated with both through openings (27, 28), wherein the valve member (32) is mounted so as to be able to pivot with respect to a pivot axis (36), wherein the valve member (32) has a sealing face (38) that is curved concentrically with the pivot axis (36), wherein the valve member (32) in a first state (30) releases the first through opening (27) and closes the second through opening (28), wherein the valve member (32) in a second state (29) releases the second through opening (28) and closes the first through opening (27), characterized in that the valve member (32) comprises a sealing part (35) and a pivot part (34), wherein the pivot part (34) is mounted so as to be able to rotate in the pivot axis (36) and wherein the sealing part (35) is connected to the pivot part (34) via a connection structure (37).
2. Thick stock valve according to Claim 1, characterized in that the valve member (32) is arranged in an inner space of the thick stock valve.
3. Thick stock valve according to one of Claims 1 to 2, characterized in that an intermediate face is arranged between the first through opening (27) and the second through opening (28), said intermediate face having a curvature which is concentric with the pivot axis (36).
4. Thick stock valve according to one of Claims 1 to 3, characterized in that in a third switching state the valve member (32) is situated between the first through opening (27) and the second through opening (28).
5. Thick stock valve according to one of Claims 1 to 4, characterized in that the connection structure (37) is rigid to torques acting relative to the pivot axis (36) .
6. Thick stock valve according to one of Claims 1 to 5, characterized in that the connection structure (37) allows a movement of the sealing part (35) relative to the pivot part (34) in the radial direction.
7. Thick stock valve according to one of Claims 1 to 6, characterized in that the connection structure comprises an elastic element (37) situated between the sealing part (35) and the pivot part (34).
8. Valve according to one of Claims 1 to 7, characterized in that there is an elastic element between a shaft (33) of the valve member (32) and a housing (46) of the valve.
9. Thick stock valve according to one of Claims 1 to 8, characterized in that the valve member (32) comprises two stub shafts (33) mounted in the pivot axis (36) and in that the stub shafts (33) enclose a free space between them.
10. Thick stock valve according to one of Claims 1 to 9, characterized in that the valve member (32) comprises one leg (51, 52, 53) which extends between the pivot axis (36) and the sealing face (38), and in that the leg (51, 52, 53) is spaced apart from an end face of a housing (46) of the thick stock valve (26).
11. Thick stock valve according to one of Claims 1 to 9, characterized in that the valve member (32) has a scraper (55), which is moved along an end face of the housing (46) of the thick stock valve (26) during a switching process of the valve member (32).
12. Thick stock valve according to one of Claims 1 to 11, characterized in that the valve member (32) comprises an outer face (43, 44, 45) by which a pressure difference present across the valve member (32) is transformed into a force acting in the radial direction.
13. Thick stock pump having a thick stock valve according to one of Claims 1 to 13 and a conveying member, characterized in that the conveying member is designed to set material in motion so that the material enters through the first and/or second inlet opening (27, 28) into the inner space of the thick stock valve.
14. Thick stock pump according to Claim 14, characterized in that the conveying member comprises a first and a second piston, wherein the switching position of the thick stock valve is coordinated with the movement of the pistons so that the thick stock pump switches between states of the thick stock valve (26) when no pressure difference is present across the valve member (32).

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