Dosing device for dosing a fluid

Abstract

The invention relates to a dosing device for dosing a fluid, in particular a liquid, comprising a cylinder, a piston, a first piston rod, and a second piston rod. The piston is connected to the first piston rod and the second piston rod. The piston is mounted in the cylinder so as to be displaceable in a first direction and a second direction, the first direction being opposite the second direction. A first cylinder chamber is defined by the cylinder, the piston, and the first piston rod. A second cylinder chamber is defined by the cylinder, the piston, and the second piston rod. The first cylinder chamber has a first cross-sectional area oriented perpendicular to the first direction. The second cylinder chamber has a second cross-sectional area oriented perpendicular to the first direction. The first cross-sectional area is larger than the second cross-sectional area.

Description

[0001] Atlas Copco IAS GmbH, Case: 11N2024EM1044DE

[0002] Dosing device for dosing a fluid

[0003] The present invention relates to a metering device for metering a fluid.

[0004] Technical background

[0005] Application systems are used in numerous industrial applications, for example in the automotive, construction, energy, and semiconductor industries, as well as in industrial assembly. Application systems serve to apply media, especially viscous and / or liquid media, to or into components. Examples of liquid media include adhesives, foams (especially polyurethane foams), battery foams, and insulating foams, as well as paints and cleaning fluids. In the automotive sector, application systems are used, for example, to apply battery foams and / or adhesives to the batteries of electric vehicles, and / or to apply adhesives to body parts and / or vehicle windows, such as windshields.

[0006] An application system typically comprises a dosing device, also called a dispenser, and an application device, also called an applicator. The dosing device and the application device can be designed together as a single device or together form a system. The dosing device is used for dosing, for example, by controlling the flow of the medium. The dosing device receives the medium from a source, such as a storage container, particularly a drum. The application device is used to apply the medium to or into a component.

[0007] Known dosing devices are relatively inflexible in their use, as variations in operation are limited by their design.

[0008] Summary of the invention

[0009] It is an object of the present invention to provide a dosing device that allows for flexible operation. It is a further object of the present invention to provide a dosing device that can be used for different dosing tasks. It is a further object of the present invention to provide a dosing device that has a simple and / or compact design.

[0010] At least one of the problems, or further problems, that arise for a person skilled in the art from the present disclosure are solved by the subject matter of the independent claim. Advantageous embodiments are the subject matter of the dependent claims and the description.

[0011] A metering device for dispensing a fluid can comprise a cylinder, a piston, a first piston rod, and / or a second piston rod. The piston can be connected to the first and second piston rods. The piston can be mounted within the cylinder so that it can move in a first direction and a second direction. The first direction can be opposite to the second direction. A first cylinder chamber can be defined by the cylinder, the piston, and the first piston rod. A second cylinder chamber can be defined by the cylinder, the piston, and the second piston rod. The first cylinder chamber can have a first cross-sectional area. The first cross-sectional area can be oriented perpendicular to the first direction. The second cylinder chamber can have a second cross-sectional area. The second cross-sectional area can be oriented perpendicular to the first direction.The first cross-sectional area can be larger than the second cross-sectional area.

[0012] The dosing device can therefore have two chambers with different cross-sectional areas. When the piston moves in one direction, the heights of the chambers change according to the distance the piston travels. The change in volume is the same in magnitude for both the first and second cylinders when the piston moves. The height of one cylinder increases, while the height of the other decreases. However, due to the different cross-sectional areas, the volume changes in the cylinders also differ in magnitude. This allows the dosing device to be used for various dosing tasks. Different operating modes of the dosing device are also possible. Furthermore, the design of the dosing device is relatively simple and compact.

[0013] The metering device can be connected to or include a drive. The drive can be configured to move the piston within the cylinder. Preferably, movement of the piston within the cylinder is possible only in the first direction and in the second direction.

[0014] The first piston rod can be connected directly or indirectly to the piston. The second piston rod can be connected directly or indirectly to the piston. The first and / or second piston rod can each pass through an opening in the cylinder. The opening in the cylinder for the first piston rod can be located on the opposite side of the cylinder from the opening in the cylinder for the second piston rod.

[0015] The first and / or second piston rod can be rotationally symmetrical, in particular essentially cylindrical. A longitudinal center axis of the first piston rod can be aligned with the longitudinal center axis of the second piston rod. The first and / or second piston rod can each have a constant cross-section.

[0016] The cylinder can have a constant cross-sectional area. The cross-sectional area can be oriented perpendicular to the first direction and / or the second direction. This means that the cross-sectional area of ​​the cylinder chambers can depend (exclusively) on the respective geometry, in particular the respective cross-sectional area, of the piston rods. Atlas Copco IAS GmbH, Case: 11N2024EM1044DE

[0017] The first cylinder chamber can be defined solely by the cylinder, the piston, and the first piston rod. The second cylinder chamber can be defined solely by the cylinder, the piston, and the second piston rod.

[0018] The volume of the cylinder chambers can depend on the position of the piston. As the piston moves, the volumes of the cylinder chambers change, with the volume of one cylinder chamber increasing and the volume of the other cylinder chamber decreasing.

[0019] The dosing device can have exactly two cylinder chambers. Likewise, the dosing device can have more than two cylinder chambers.

[0020] A cylinder chamber can be understood as an area or volume within the cylinder chamber into which a fluid can flow in and / or out.

[0021] The first cross-sectional area of ​​the first cylindrical chamber can be at least 1%, preferably at least 2%, preferably at least 3%, preferably at least 5%, preferably at least 7%, preferably at least 10%, preferably at least 12%, preferably at least 15%, preferably at least 20%, preferably at least 25%, preferably at least 30% larger than the second cross-sectional area of ​​the second cylindrical chamber.

[0022] Preferably, the diameter of the first piston rod is smaller than the diameter of the second piston rod. This results in different cross-sectional areas of the cylinder chambers, especially since the cross-sectional area of ​​the cylinder is constant.

[0023] The diameter of the first piston rod can be at least 1%, preferably at least 2%, preferably at least 3%, preferably at least 5%, preferably at least 7%, preferably at least 10%, preferably at least 12%, preferably at least 15%, preferably at least 20%, preferably at least 25%, preferably at least 30% smaller than the diameter of the second piston rod.

[0024] Preferably, the cross-sectional area of ​​the first piston rod is smaller than the cross-sectional area of ​​the second piston rod. The cross-sectional area can be oriented perpendicular to the first direction and / or the second direction.

[0025] The cross-sectional area of ​​the first piston rod can be at least 1%, preferably at least 2%, preferably at least 3%, preferably at least 5%, preferably at least 7%, preferably at least 10%, preferably at least 12%, preferably at least 15%, preferably at least 20%, preferably at least 25%, preferably at least 30% smaller than the cross-sectional area of ​​the second piston rod. Atlas Copco IAS GmbH, Case: 11N2024EM1044DE

[0026] The fluid can flow into the first cylinder chamber from a fluid source, and the fluid can flow out of the second cylinder chamber towards an outlet when the piston is moved in the second direction.

[0027] The fluid can flow into the second cylinder chamber from the fluid source, and the fluid can flow out of the first cylinder chamber towards the outlet when the piston is moved in the first direction.

[0028] The first cylinder chamber can be connected to the fluid source via a first line. The first cylinder chamber can be connected to the outlet via a second line. The first line can have a first valve and / or the second line can have a second valve.

[0029] The second cylinder chamber can be connected to the fluid source via a third line. The second cylinder chamber can be connected to the outlet via a fourth line. The third line can have a third valve and / or the fourth line can have a fourth valve.

[0030] Brief description of the characters

[0031] Embodiments of the present disclosure are described in detail below with reference to a figure.

[0032] Fig. 1 shows a dosing device 100.

[0033] Detailed description

[0034] Fig. 1 shows a metering device 100. The metering device 100 can comprise a piston 20, a first piston rod 30, and a second piston rod 40. The first piston rod 30 can be connected to the piston 20. The second piston rod 40 can be connected to the piston 20 (opposite the first piston rod 30).

[0035] The piston 20 can be arranged to move within a cylinder 10. This movement can be provided by a drive 80. The drive 80 can be configured to move the first piston rod 30 and / or the second piston rod 40.

[0036] The piston 20, the first piston rod 30, and / or the second piston rod 40 can be moved in a first direction +y and / or in a second direction -y. The first direction +y can be opposite the second direction -y. The first direction +y and / or the second direction -y can be defined by a longitudinal center axis of the first and / or second piston rod 30, 40. Atlas Copco IAS GmbH, Case: 11N2024EM1044DE

[0037] A first cylinder chamber 50 can be formed on one side of the piston 20 in the cylinder 10. A second cylinder chamber 60 can be formed on the other side of the piston 20 in the cylinder 10. The sides can be opposite sides.

[0038] In this embodiment, the diameter of the first piston rod 30 is smaller than the diameter of the second piston rod 40. The cross-sectional area of ​​the cylinder can be constant. Accordingly, the cross-sectional area of ​​the first cylinder chamber 50 is larger than the cross-sectional area of ​​the second cylinder chamber 60.

[0039] A first line 81 can connect the first cylinder chamber 50 to a fluid source 88, e.g., a barrel or a storage container. A second line 82 can connect the first cylinder chamber 50 to an outlet 86.

[0040] A third line 83 can connect the second cylinder chamber 60 to the fluid source 88. A fourth line 84 can connect the second cylinder chamber 60 to the outlet 86.

[0041] "Connecting" can generally mean "fluidly communicating connecting".

[0042] The fluid source 88 can be connected to the first line and the third line 83 via a line 87. A pump 70 can be arranged between the fluid source 88 and the first line 81 and / or the third line 83 to pump the fluid or pressurize it.

[0043] The first line 81 can have a first valve VI. The second line 82 can have a second valve V2. The third line 83 can have a third valve V3. The fourth line 84 can have a fourth valve V4.

[0044] When piston 20 is moved in the first direction +y, the second valve V2 can be open, the first valve VI closed, the third valve V3 open, and the fourth valve V4 closed. This allows fluid to be discharged from the first cylinder chamber 50 and (simultaneously) fluid to flow into the second cylinder chamber 60.

[0045] When the piston 20 is moved in the second direction -y, the second valve V2 can be closed, the first valve VI open, the third valve V3 closed, and the fourth valve V4 open. This allows fluid to be discharged from the second cylinder chamber 60 and (simultaneously) fluid to flow into the first cylinder chamber 50.

[0046] The piston 20 can be moved alternately in the first direction +y and in the second direction -y, so that the first and second cylinder chambers 50, 60 fill and empty alternately (simultaneously). Atlas Copco IAS GmbH, Case: 11N2024EM1044DE

[0047] By using cylinder chamber cross-sectional areas of varying sizes, different application patterns can be easily achieved without compromising control accuracy. This allows for a wide variety of application patterns to be achieved with a single device, increasing application flexibility. The different piston rod cross-sectional areas (different diameters) enable different volumes and pressures when the piston moves in different directions. This results in multiple applications using only one device.

Claims

Atlas Copco IAS GmbH, Case: 11N2024EM1044DE Claims 1. Metering device (100) for metering a fluid, in particular a liquid, the metering device (100) comprising a cylinder (10), a piston (20), a first piston rod (30) and a second piston rod (40), wherein: - the piston (20) is connected to the first piston rod (30) and the second piston rod (40); - the piston (20) is mounted in the cylinder (10) so as to be movable in a first direction (+y) and a second direction (-y), wherein the first direction (+y) is opposite to the second direction (-y); - a first cylinder chamber (50) is defined by the cylinder (10), the piston (20) and the first piston rod (30); a second cylinder chamber (60) is defined by the cylinder (10), the piston (20) and the second piston rod (40); - the first cylindrical chamber (50) has a first cross-sectional area oriented perpendicular to the first direction (+y); - the second cylindrical chamber (60) has a second cross-sectional area oriented perpendicular to the first direction (+y); and - the first cross-sectional area is larger than the second cross-sectional area.

2. Metering device according to claim 1, wherein the diameter of the first piston rod (30) is smaller than the diameter of the second piston rod (40).

3. Dosing device according to claim 1 or 2, wherein: - the fluid flows into the first cylinder chamber (50) from a fluid source (88) and the fluid flows out of the second cylinder chamber (60) towards an outlet (86) when the piston (20) is moved in the second direction (-y); and - the fluid flows from the fluid source (88) into the second cylinder chamber (60) and the fluid flows out of the first cylinder chamber (50) in the direction of the outlet (86) when the piston (20) is moved in the first direction (+y).

4. Dosing device according to one of the preceding claims, wherein: - the first cylinder chamber (50) is connected to a fluid source (88) by means of a first line (81) and to an outlet (86) by means of a second line (82), in particular wherein the first line (81) has a first valve (VI) and the second line (82) has a second valve (V2); and - the second cylinder chamber (60) is connected to the fluid source (88) by means of a third line (83) and to the outlet (86) by means of a fourth line (84), in particular wherein the third line (83) has a third valve (V3) and the fourth line (84) has a fourth valve (V4). Atlas Copco IAS GmbH, Case: 11N2024EM1044DE

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