EP3992457A1 - Metering pump and use of a metering pump - Google Patents

Abstract

Metering pump (1) for dispensing a fluid (3), comprising a hose bearing (31) for receiving a deformable hose (16) and a pressure roller (30). The pressure roller (30) runs along a hose (16) accommodated in the hose store (31) in a conveying direction (25) from a starting point (23) to an end point (24) and counter to the conveying direction (25) from the end point (24) to movable at least to the starting point (23). The pressure roller (30) presses on the hose (16) with a pressure force when moving in the conveying direction (25). The dosing pump (1) has a release mechanism which releases the pressure force of the pressure roller (30) on the hose (16) when it moves against the conveying direction (25).

Description

The present invention relates to a metering pump and the use of a metering pump.

Metering pumps are already known from the prior art. Such dosing pumps are used, for example, to apply a predetermined quantity of an adhesive to a screw thread.

A dosing pump is in WO 2009/099616 A2 described. This dosing pump works on the principle of a peristaltic pump. The central element of the dosing pump is a rotating body, which is equipped with several pressure rollers. A hose is arranged around the rotary body in a hose bearing, which hose is squeezed against the hose bearing by the pressure rollers. The rotary body can be moved in a direction of rotation by a pump lever, so that the pressure rollers convey a fluid in the hose in the direction of rotation. The rotating body is locked in the opposite direction. The disadvantage of such a system is that, although a fluid can be pumped reliably, the pumped quantity is not delivered continuously, but pulsates. Every time a pressure roller releases the fluid-carrying hose, there is an undesired short-term interruption in delivery. Since the rotation angle per actuation is small, the dosing amount per actuation varies.

It is the object of the invention to overcome the disadvantages of the prior art. In particular, a dosing pump for the precise and reproducible dispensing of a fluid is to be made available. This object is achieved by the devices defined in the independent patent claims. Further Embodiments emerge from the dependent patent claims.

A dosing pump according to the invention for dispensing a fluid comprises a hose bearing for receiving a deformable hose and a pressure roller. The pressure roller can be moved along a hose accommodated in the hose store in a conveying direction from a starting point to an end point and counter to the conveying direction from the end point to at least the starting point.

The pressure roller is arranged in such a way that during a movement in the conveying direction from the starting point, the pressure roller presses on the hose with a pressing force and a fluid contained in the hose is conveyed. The dosing pump has a release mechanism which releases the pressing force of the pressure roller on the hose for a movement counter to the conveying direction.

The flow rate is defined and therefore reproducible due to the defined movement distance of the pressure roller from the starting point to the end point. In addition, it can be ensured that the fluid can be conveyed continuously during this movement. It is true that such a metering pump cannot be used to deliver a fluid in an endlessly continuous manner. However, during the movement from the start point to the end point, the conveyance is continuous. There is no pulsating delivery of the fluid.

The dosing pump can have a clamping device in the conveying direction before the starting point or after the end point in order to apply a clamping force to a hose arranged in the hose bearing and to close it. By realizing a The clamping device can be used to ensure that there is no unintentional continued dispensing of fluid and no fluid runs back into hose when the roller is lifted from the hose for movement back to the starting point. It is also possible to use a non-return valve to prevent the fluid from running back.

The dosing pump can have a hose. This hose is preferably deformable in such a way as to allow pressure to build up inside the hose between the pressure roller and the clamping device during the movement of the pressure roller in the conveying direction. By using a deformable tube, which allows pressure to build up, the amount causing the pressure build-up can be released quickly at the application site when the clamping device is released.

The hose can be designed to be elastic in such a way that when the pressure roller moves in the conveying direction, it resumes its original shape at the positions in the afterrun of the pressure roller. After the passage of the pressure roller, the fluid is thus drawn in if the hose is connected to a corresponding fluid reservoir. The hose is therefore always filled with a fluid following the pressure roller.

The hose can have a round cross-section. However, it is also conceivable that an elliptical cross section of the tube is used. An elliptical cross-section is suitable if a larger flow rate is to be applied. It is also conceivable that the cross-section of the hose is approximately hexagonal, pentagonal, square, rectangular or triangular.

The clamping force of the clamping device can be adjustable. The clamping force can thus be adapted to the properties of a hose used in the dosing device. Depending on the application, a hose with a larger or smaller diameter, with a larger or smaller wall thickness or made of different materials can be used, for example. The clamping force must then be set in such a way that the hose can be reliably closed.

The clamping device can be designed in such a way that when a specific or determinable pressure is reached within the tube, the effect of the clamping force is canceled and the tube opens. For example, this can prevent the hose from bursting inside the dosing pump.

The pressure roller and the clamping device can be operatively connected to one another in such a way that the clamping force of the clamping device is canceled when the end point is reached. This ensures that every time the end point is reached, the pumped fluid actually exits the pump and can be applied.

The pressure roller can be connected to a movable, in particular pivotable, pump lever for moving the pressure roller. Such a swiveling pump lever is very easy to use, especially for manual operation. Of course, other mechanisms are also conceivable, which can move the pressure roller in the conveying direction.

The release mechanism can connect the pressure roller to the pump lever via a joint and a joint lever in such a way that the pressure roller can be switched between a pressure position in which the pressure roller acts on a hose arranged in the hose bearing presses and is movable to a released position. The position of the pressure roller can be varied very easily via such a joint with a jointed lever.

The joint can have a stop to define the pressing position. A targeted stop can be used to ensure that the pressing position of the pressing roller is always at the same distance from the hose bearing.

The stop can be adjustable so that the pressing position can be adapted to the circumstances and properties of a hose arranged in the hose store.

The joint can have a dead point beyond which the pressure roller does not exert any pressure force on the hose. Accordingly, the pressure roller is then in a released position. The use of a dead center of a joint allows a simple realization of the definition of a pressing position and a released position.

The pressing force of the pressing roller can be adjustable. Due to the adjustability of a contact pressure, the dosing pump can be specifically adapted to the properties of the hose to be used. The contact pressure can also be adjusted depending on the fluid to be pumped in order to ensure optimal pumping.

The dosing pump can be equipped with a hose fitted with a dosing nozzle. The use of a dosing nozzle enables the fluid to be pumped to be applied in a targeted manner. The dosing nozzle can have at least one lateral nozzle opening. Such a metering nozzle allows, for example, the targeted application of a fluid into a borehole in which the Fluid is not applied at the end of the borehole but on the wall of the borehole. The configuration of the dosing nozzle with at least one lateral nozzle opening is independent of the configuration of the dosing pump.

The dosing pump can have several nozzle receptacles for receiving a dosing nozzle. In this case, the nozzle receptacles can be inclined relative to one another by a certain angle. Such an arrangement enables the direction of the nozzle to be varied and thus a targeted application of the fluid to be conveyed, even in areas that are difficult to access. For example, the metering nozzle may be angled at a right angle from a general direction of discharge at the end of the metering pump. If there are a number of such nozzle receptacles, different delivery angles can be easily implemented in each case. However, it is also conceivable for a metering pump to be designed with a number of hoses and a number of metering nozzles, so that a fluid can be applied simultaneously in a number of directions or in larger areas. The dosing pump can also have a nozzle receptacle for receiving a dosing nozzle, which is mounted so that it can be freely pivoted and fixed at a certain angle. This makes it possible to freely select the emission angle depending on the application.

The hose and/or the dosing nozzle can be exchangeable. Thus, the dosing pump can be easily adapted to the circumstances.

The metering pump may include a device that indicates the clamping force of the clamping device. In particular, it is advantageous if it is displayed that the clamping device is released, so that the fluid can exit from the nozzle. Such a display can be acoustic, haptic or visual. In particular when a fluid is applied in a borehole that is difficult to see into, it is helpful if the user can check that the clamping device has actually opened and the fluid has been applied.

The dosing pump can have a backstop, which only allows the pressure roller to move in the conveying direction when the pressure roller exerts a pressure force on a hose arranged in the hose bearing. Such a backstop prevents the pressure roller from being unintentionally moved counter to the conveying direction.

The backstop and the pressure roller can be operatively connected to one another in such a way that when the end point is reached, the backstop is released and a movement of the pressure roller counter to the conveying direction is made possible. Such an embodiment guarantees that the backstop is released automatically when the end point is reached. The release of the movement against the conveying direction gives the user feedback on reaching the end point and thus on the application of the defined amount of fluid.

The starting point and/or the end point can be fixed along the hose bearing so that the amount of fluid to be dispensed can be adjusted by determining the path between the starting point and the end point. This enables precise dosing of the fluid to be pumped.

Figur 1:

Eine perspektivische Darstellung einer erfindungsgemässen Dosierpumpe.

Figur 2a:

Eine Draufsicht auf die Dosierpumpe gemäss Figur 1 mit abgenommenem Deckel.

Figur 2b:

Die Draufsicht auf die Dosierpumpe gemäss Figur 2a, wobei der Pumphebel betätigt wurde.

Figur 3:

Eine perspektivische Darstellung der Dosierpumpe gemäss Figur 2.

Figur 4:

Einen Schnitt durch die Dosierpumpe gemäss Figur 1 mit einer ersten Schnittebene parallel zum Deckel.

Figur 5a:

Einen Schnitt durch die Dosierpumpe gemäss Figur 1 mit einer zweiten Schnittebene parallel zum Deckel, wobei die Ansicht von der Rückseite erfolgt.

Figur 5b:

Eine vergrösserte Ansicht aus Figur 5a mit Fokus auf die Rücklaufsperre.

Figuren 6:

Eine schematische Darstellung des Wechsels zwischen Anpressposition und gelöster Position der Anpressrolle.

A further aspect of the present invention relates to the use of a metering pump, as explained above, for the application of fluids, in particular for the application of adhesives. The invention is explained in more detail below on the basis of figures, which merely represent exemplary embodiments. Show it:

Figure 1:

A perspective view of a metering pump according to the invention.

Figure 2a:

A top view of the dosing pump according to figure 1 with the lid removed.

Figure 2b:

The top view of the dosing pump according to Figure 2a , whereby the pump lever was actuated.

Figure 3:

A perspective view of the dosing pump according to figure 2 .

Figure 4:

A section through the dosing pump according to figure 1 with a first sectional plane parallel to the lid.

Figure 5a:

A section through the dosing pump according to figure 1 with a second sectional plane parallel to the lid, viewed from the rear.

Figure 5b:

An enlarged view Figure 5a with focus on the backstop.

Figures 6:

A schematic representation of the change between the pinch position and the released position of the pinch roller.

In the Figures 1 to 5 the same dosing pump 1 is shown in different representations and with different sectional planes.

figure 1 shows the metering pump with a base body 10 which has a handle 11, a cover 60, one or more hose guides 15 and one or more nozzle receptacles 51. A rotatable pump lever 20 is arranged on the base body 10 . A pump spring 21 is clamped between the pump lever 20 and the handle 11 .

the figures 2a and 2 B show a plan view of the metering pump 1 with the cover removed. A pressure roller 30 is connected to the pump lever 20 via a joint 35 and a joint lever 36 . By moving the pump lever 20 against the spring force of the spring 21, the pressure roller 30 can be moved in a conveying direction 25 from a starting point 23 to an end point 24 along a hose bearing 31 (see FIG figure 3 ).

Depending on the position of the pressure roller 30 - pressure position 37 (see Figure 2b ) or released position 38 (see Figure 2a ) - the pressure roller 30 exerts a pressure force on a hose 16 arranged in a hose bearing 31 (see Figures 6a to 6d ) out of. The contact pressure of the contact roller 30 is thereby controlled by a contact spring 33 (see figure 4 ) controlled. This pressure spring 33 can be adjusted via an adjusting screw 34 (see figure 4 ) must be pretensioned so that the contact pressure can be adjusted. By moving the articulated lever 36 past the dead center of the articulation 35, the pressure roller 30 pivots between the pressing position 37 and the released position 38 (see FIG Figures 6a to 6d ).

In the Figures 6a to 6d is the change between the two positions of the pressure roller 30 - pressing position 37 or released position 38 - shown schematically. The pressure roller 30 is in the released position 38 before the metering pump is used for the first time (see Figure 6a ). The hose 16 lies loosely on the hose bearing 31 and is pressed by the pressure roller 30 not burdened. The articulated lever 36 is on the left side (according to Figure 6a ) the dead center of the joint 35 between the pump lever 20 and the joint lever 36.

When the pump lever 20 moves in the conveying direction 25 (see Figures 6a and 6b ) the pressure roller 30 is initially held back in the area of its pivot bearing by a return spring 61 with a latching contour. As a result, the return spring 61 is deflected and the articulated lever 36 of the pressure roller 30 is pivoted out, so that the pressure roller 30 moves in the direction of the hose bearing 31 . The hose 16 is squeezed between the hose bearing 31 and the pressure roller 30 (see Figure 6b ). This defines the starting point 23. With a further movement of the pump lever 20, the return spring 61 is released from the pressure roller 31. The pressure roller 30 is further in the conveying direction 25 at most to the end point 24 (see figure 3 ) moves along the hose bearing 31. In this case, the articulated lever 36 is supported by a stop, so that the pressing position 37 of the pressing roller relative to the hose 16 does not change. The pinch point of the hose 16 is continuously shifted in the conveying direction 25 , a fluid in the hose 16 is thus transported in the conveying direction 25 .

As soon as the end point 24 (see figure 3 ) is reached, a movement of the pump lever 20 in the release direction 26, opposite to the conveying direction 25, is released. An early movement in the release direction 26 is caused by a backstop 70 (see Figures 5a and 5b ) prevented. The hose 16 offers a natural resistance to movement of the pressure roller 30 in the release direction 26 (see FIG Figure 6c ). The articulated lever 36 is thus pivoted past the dead center of the articulation 35 so that the pressure roller can move back into the released position 38 . This situation is in Figure 6d shown. The pump lever 20 is reset thus without the pressure roller 30 acting on the hose 16. Upon reaching the starting point 23 (see figure 3 ) the restoring spring 61 slides with its latching contour over the corresponding area of the pressure roller 30, which again corresponds to the starting position Figure 6a is equivalent to.

The return spring 61 is firmly connected to the cover 60 (see Figure 5a ). The restoring spring 61 defines the starting point 23 of the conveying movement with its latching contour. The cover 60 is rotatably mounted on the base body 10 and can be fixed with a locking screw 64 (see figure 1 ) to be fixed. The starting point 23 can thus be adjusted with the locking screw 64 . The movement angle of the pump lever 20 and thus the path of the pressure roller 30 between the starting point 23 and the end point 24 is defined. The edge of the cover 60 can be marked with a grid dimension, which serves as a dosage quantity display 65 . This grid dimension can be matched to a specific hose diameter and labeled accordingly, so that the desired metered quantity can be set easily.

the figure 4 shows a tube 16 as inserted when using the metering pump 1. The hose 16 is provided with a dosing nozzle 50 at one end. The dosing nozzle 50 is inserted into a dosing receptacle 51 . The hose 16 then runs in the base body 10 from the dosing nozzle 50 to a clamping device 40, through hose guides 15, along the hose bearing 31 and through a hose bushing 14 to the handle 11 of the dosing pump 1.

In figure 1 the dosing pump 1 is additionally shown schematically with a fluid reservoir in the form of a bottle 2 with a fluid 3 . This bottle 2 is in a thread 13 of a bottle holder 12 in the handle 11 of the base body 10 of the dosing pump 1 arranged. It goes without saying that the bottle also has a complementary thread. The bottle 3 shown can take any shape. It is also conceivable that this is an open container which is not directly connected to the dosing pump 1 . The hose 16 (See figure 4 ) leads out of the handle 11 into the bottle 2 and dips into the fluid 3 there.

figure 4 shows the metering pump 1 in a perspective sectional view. The clamping device 40 is formed by a seat 41, which is formed in the base body 10 as an edge, and a clamp 42, which is pivotally mounted on the base body 10. The clamp 42 is biased towards the seat 41 by a clamp spring 43 . The preload of the clamping spring 43 can be adjusted by means of an adjusting screw 44 . The clamping force is preferably set in such a way that a hose 16 arranged in the metering pump 1 is compressed, ie closed. The clamping device 40 enables pressure to be built up inside the hose 16 by moving the pressure roller 30 in the conveying direction 25 . Only when the clamping device 40 is opened and the hose 16 is correspondingly opened is the fluid delivered then released through a nozzle opening 52 of the metering nozzle 50 .

The pump lever 20 not only serves to move the pressure roller 30. A trigger 22 is also arranged on the pump lever 20, which when the pressure roller 30 reaches the end point 24 hits the clamp 42 and the clamp 42 is released. The clamping device 40 is opened, the clamped tube 16 is relieved and the fluid is discharged. As soon as the pump lever 20 is moved again against the conveying direction 25, the trigger 22 is released from the clamp 42, the clamping force of the clamping spring 43 acts on the clamp 42 again, so that the metering pump 1 arranged in the Hose 16 is pressed and closed. This ensures that no fluid can flow back when the pressure roller is no longer squeezing the hose for movement back to the starting point.

The dosing nozzle 50 has at least one nozzle opening 52 . The dosing nozzle 50 preferably has at least one laterally arranged nozzle opening 52 which allows the application of a fluid essentially transversely to the longitudinal direction of the dosing nozzle 50 . In particular when applying an adhesive, for example a screw locking adhesive, but also with other fluids, the thread in a threaded bore or the side wall of a bore can be provided with the fluid.

In the Figures 5a and 5b is a perspective view of a section through the inventive metering pump 1, wherein the Figure 5b focuses on the backstop 70. The rear view is shown. The cover 60 can be seen from its inner side, which receives the return spring 61 at a fastening end 62 with a receiving element 63 . Furthermore, snap-in teeth 72 are arranged on this cover 60 , which together with a spring wire 71 and a guide link 74 form the backstop 70 and prevent the pressure roller 30 and the pump lever 20 from moving against the conveying direction 25 . The latching teeth 72 have ramps in the conveying direction 25, while flanks perpendicular to the conveying direction 25 actively prevent a return movement. The spring wire 71 is mounted in a guide link 74 of a guide plate 75 . Upon reaching the end point 24 (see figure 3 ) the spring wire 71 moves in the conveying direction 25 onto an unlocking ramp 73 and is thus raised above the height of the latching teeth 72 in the guide slot 74 against its pretension. The guide link 74 has a step, so that the spring wire 71 remains in the raised position for the time being. In the raised position, the return against the conveying direction 25 is released. Upon reaching the starting point 23 (see figure 3 ) the spring wire 71 pushes against an end cam 76, which is designed higher than the latching teeth 72. The spring wire 71 is pushed from its raised position onto the step of the guide link 74 so that it can in turn perform its latching function with the latching teeth 72 .

Claims (15)

Metering pump (1) for dispensing a fluid (3), comprising a hose bearing (31) for receiving a deformable hose (16) and a pressure roller (30), the pressure roller (30) running along a hose (16 ) can be moved in a conveying direction (25) from a starting point (23) to an end point (24) and counter to the conveying direction (25) from the end point (24) to at least the starting point (23), the pressure roller (30) being at one movement in the conveying direction (25) from the starting point (23) is arranged in such a way that the pressure roller (30) presses the hose (16) with a contact force and a fluid (3) contained in the hose (16) is conveyed, characterized that the dosing pump (1) has a release mechanism which releases the pressing force of the pressure roller (30) on the hose (16) for a movement counter to the conveying direction (25). Metering pump (1) according to Claim 1, the metering pump (1) having a clamping device (40) in the conveying direction (25) after the end point (24) in order to apply a clamping force to a hose (16) arranged in the hose bearing (31) and to close. Metering pump (1) according to Claim 2, with a hose (16), the hose (16) being deformable in such a way as to prevent a pressure build-up within the hose (16) between the pressure roller (30) and the clamping device (40) during the movement of the To allow pressure roller (30) in the conveying direction (25). Metering pump (1) according to claim 2 or 3, wherein the clamping force of the clamping device (40) is adjustable. Metering pump (1) according to one of Claims 2 to 4, the pressure roller (30) and the clamping device (40) being operatively connected to one another in such a way that when the end point (24) is reached, the clamping force of the clamping device (40) is released. Metering pump (1) according to one of the preceding claims, wherein the pressure roller (30) is connected to a movable, in particular pivotable, pump lever (20) for moving the pressure roller (30). Dosing pump (1) according to claim 8, wherein the release mechanism connects the pressure roller (30) to the pump lever (20) via a joint (35) and a joint lever (36), so that the pressure roller (30) between a pressing position (37) at which presses the pressure roller (30) onto a hose (16) arranged in the hose bearing (31) and can be moved to a released position (38). Dosing pump (1) according to Claim 8, in which the articulation (35) has a dead point which, when this is exceeded, the pressure roller (30) does not exert any pressure force on the hose (16). Metering pump (1) according to one of the preceding claims, wherein the contact pressure of the pressure roller (30) is adjustable. Metering pump (1) according to one of the preceding claims, with a hose (16), the hose (16) being provided with a metering nozzle (50). Metering pump (1), in particular according to one of the preceding claims, with a hose (15) and a metering nozzle (50), wherein the dosing nozzle (50) has at least one lateral nozzle opening (52). Metering pump (1) according to one of the preceding claims, wherein the metering pump (1) has a backstop (70) which allows movement of the pressure roller (30) only in the conveying direction (25) when the pressure roller (30) exerts a pressure force on an im Hose bearing (31) arranged hose (16) exerts. Metering pump (1) according to Claim 12, the backstop (70) and the pressure roller (30) being operatively connected to one another in such a way that when the end point (24) is reached, the backstop (70) is released and a movement counteracts the pressure roller (30). the conveying direction (25) is made possible. Metering pump (1) according to one of the preceding claims, in which the starting point (23) and/or end point (24) can be fixed along the hose bearing (31), so that the quantity of fluid (3) to be dispensed can be determined by determining the path between the starting point (23 ) and end point (24) can be set. Use of a metering pump (1) according to one of the preceding claims for the application of fluids (3), in particular adhesives.

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