Air trap device and nozzle for it

Abstract

Chromatography system with an air trap device (200) designed to remove air from a fluid, the air trap device includes: a receiving container (210) which is designed to receive the fluid, and a nozzle (100) which is arranged in the receiving container (210) and has: a body having an inlet opening (110) designed to receive the fluid, and an outlet opening (120) which is configured to distribute the fluid along an edge of the outlet opening (120), wherein the body of the nozzle (100) is funnel-shaped and the inlet opening (110) is smaller than the outlet opening (120), wherein the receiving container (210) comprises: a lid section (220), a drainage section (230) which has a fluid outlet (240) and a fluid inlet (250), and a tubular section (260) connecting the cover section (220) and the drainage section (230); and the nozzle (100) further comprises a guide element (140) which is coupled to the body of the nozzle and is configured to direct the fluid distributed along the edge of the outlet opening (120) in the direction of gravity, wherein the guide element (140) comprises a tubular element which is coupled to the inlet opening (110) of the body of the nozzle (100) and further to the fluid inlet (250) of the receiving container (210).

Description

TECHNICAL AREA

[0001] The present invention relates to an air trap device and a nozzle therefor, which is configured to remove air from a fluid, and in particular is configured to remove air from a fluid that is supplied to a chromatography device. BACKGROUND

[0002] Chromatography is a well-known method for analyzing and processing chemical mixtures or samples. The sample is typically dissolved in a fluid called a buffer solution. The different components of the mixture migrate through a column at different rates, causing them to separate. This separation can be used to further isolate the sample components in a fractionation step, where the mobile phase can be directed into different containers, for example, through an outlet valve of the chromatography apparatus.

[0003] The fractionation step can be controlled based on a sensor that detects various properties of the fluid exiting the column, for example, detected ultraviolet light absorption properties of the fluid.

[0004] One problem with such chromatography systems is that air present in the fluid flowing through the column hinders the separation and detection of the fluid's properties.

[0005] Some existing chromatography systems can solve this problem by incorporating an air trap device, which, for example, has a sealed and elongated receiving vessel equipped with an inlet and an outlet located in the lower part of the receiving vessel, with the bottom defined as an end section oriented in the direction of gravity.

[0006] At least one problem with such conventional air trap devices is that portions of the fluid entering the air trap device through the inlet immediately exit the device through the outlet. Likewise, air trapped within the fluid can also exit the air trap device immediately through the outlet.

[0007] Another problem arises when the fluid supplied to the chromatography apparatus changes gradient-wise over time, for example, from a low-density fluid to a high-density fluid. Ideally, the gradient should generally exhibit a linear or desired characteristic. If portions of the fluid entering the air trap device through the inlet immediately exit through the outlet, the linearity of the gradient deteriorates.

[0008] At least one problem with such conventional air trap devices is the formation of foam within the air trap device.

[0009] Therefore, there is a need for an improved air trap device and a nozzle for it. TASKS OF INVENTION

[0010] One objective of embodiments of the present invention is to provide a solution that mitigates or solves the disadvantages and problems described above. BRIEF SUMMARY OF THE INVENTION

[0011] The aforementioned and other tasks are fulfilled by the subject matter described in this text. Further advantageous implementation methods of the invention are defined in more detail in this text.

[0012] According to a first aspect of the invention, the above-mentioned and further problems are fulfilled with a nozzle for an air trap device which is configured to remove air from a fluid, wherein the nozzle comprises a body having an inlet opening configured to receive the fluid and an outlet opening configured to distribute the fluid along an edge of the outlet opening, wherein the edge comprises a control element configured to reduce the surface tension of the fluid.

[0013] At least one advantage of the invention according to this embodiment is that a fluid gradient is maintained. A further advantage is that foaming is reduced.

[0014] According to a second aspect of the invention, the above-mentioned and further tasks are accomplished with an air trap device designed to remove air from a fluid and comprising the nozzle according to the first aspect.

[0015] The advantages of the second aspect are the same as those of the first aspect.

[0016] Further applications and advantages of embodiments of the invention will become apparent from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 shows a nozzle for an air trap device having a trailing edge with a control element, according to one or more embodiments of the present disclosure. Fig. Figure 2 shows a nozzle for an air trap device having a body with a funnel shape, according to one or more embodiments of the present disclosure. Fig. Figure 3A-D shows edges that include control elements of different shapes, according to embodiments of the present disclosure. Fig. Figure 4 shows a nozzle for an air trap device having a guide element, according to one or more embodiments of the present disclosure. Fig. Figure 5 shows a nozzle for an air trap device comprising a guide element and a feed element, according to one or more embodiments of the present disclosure. Fig. Figures 6A-B show an air trap device according to one or more embodiments of the present disclosure. Fig. Figure 7 shows an air trap device having a drainage section comprising several openings, according to one or more embodiments of the present disclosure. Fig. Figure 8 shows an air trap device having a drainage section with a funnel shape, according to one or more embodiments of the present disclosure. Fig. Figure 9 shows an air trap device having a tubular section with an annular protrusion, according to one or more embodiments of the present disclosure. Fig. Figure 10 shows an exploded view of an example of the air trap device according to one or more embodiments of the present disclosure. Fig. Figure 11 shows an example of the nozzle according to one or more embodiments of the present disclosure.

[0017] The person skilled in the art will gain a more complete understanding of embodiments of the invention and recognize further advantages of the invention from studying the following detailed description of one or more embodiments. It is understood that the same reference numerals are used to designate identical elements illustrated in one or more of the figures. DETAILED DESCRIPTION

[0018] An “or” in this description and the corresponding claims is to be understood as a mathematical OR, encompassing both “and” and “or”, and is not to be understood as an XOR (exclusive OR). The indefinite articles “one” in this disclosure and the claims are not limited to “one” and can also be understood as “one or more”, that is, as plural.

[0019] In the present disclosure, the terms receiving container, container or reservoir are used interchangeably to refer to an arrangement suitable for receiving fluid.

[0020] In the present revelation, the terms fluid inlet and inlet are used interchangeably. Similarly, the terms fluid outlet and outlet are used interchangeably.

[0021] Fig. Figure 1 shows a nozzle 100 for an air trap device designed to remove air from a fluid. The nozzle 100 is typically designed to be coupled to an inlet 250 of the air trap device, for example by surrounding or being surrounded by the inlet 250. The nozzle may also be provided with a seal arranged between the inlet and the nozzle, as shown in Figure 1. Fig. 10 will be described in more detail.

[0022] The nozzle 100 can comprise a body having an inlet opening 110 configured to receive the fluid and an outlet opening 120 configured to distribute the fluid along a trailing edge of the outlet opening 120. In one example, the nozzle 100 is coupled to the inlet 250 of the air trap device 200 and receives fluid from the inlet 250.

[0023] The fluid is then guided within a fluid channel inside the body to the outlet opening 120. The nozzle is typically designed to be aligned with the body so that its inlet opening 110 points in the direction of gravity and its outlet opening 120 points in the opposite direction to gravity. That is, the body is designed to be oriented vertically to the direction of gravity. This has the effect of distributing the received fluid evenly along the edge of the outlet opening 120. In one example, the body is shaped as a tubular or cylindrical element.

[0024] When fluid is distributed along the edge, one or more droplets form, which grow larger and larger until gravity overcomes the surface tension. This can lead to a pulsating fluid flow across the edge.

[0025] To overcome this problem, the present disclosure provides an edge comprising a control element 130 configured to reduce the surface tension of the fluid. This feature has the effect of generating a uniform flow of the fluid along the edge by reducing the surface tension.

[0026] At least one advantage of the present disclosure is that by ensuring a smooth introduction of the fluid received from the inlet 250 into the receiving vessel 210, foaming is mitigated or reduced. A further advantage of the present disclosure is that foaming is further reduced by mitigating or reducing pulsations or fluctuations in the fluid flow through the addition of a control element 130. This is achieved by means of an edge encompassing the control element 130, which breaks the surface tension and thereby mitigates or reduces the formation of droplets that cause pulsations or fluctuations in the fluid flow. The reduced pulsations or fluctuations in the fluid flow further mitigate or reduce the formation of foam.

[0027] At high fluid flow rates, a cylindrically shaped nozzle may not be able to maintain the desired uniform fluid flow along the edge and could even expel fluid in an upward direction against the direction of gravity.

[0028] Fig. Figure 2 shows a nozzle 100 for an air trap device 200, which has a funnel-shaped body, according to one or more embodiments of the present disclosure. A nozzle 100 is provided wherein the body has a funnel shape and an inlet opening 110 that is smaller than the outlet opening 120. This has at least the effect of increasing the circumference of the edge and reducing the fluid flow rate, thereby generating a uniform flow of the fluid along the edge even at high or higher fluid flow rates than a nominal flow rate.

[0029] At least one advantage of the present disclosure is that by ensuring a gentle introduction of the fluid received from the inlet 250 into the receiving vessel 210, foaming or the formation of foam is further mitigated or reduced. Another advantage of the present disclosure is that the fluid flow is kept more constant by providing a funnel-shaped nozzle 100, which ensures a more constant fluid flow.

[0030] Fig. Figure 3A shows an edge comprising a control element 130 having a sinusoidal shape, according to embodiments of the present disclosure.

[0031] At least one advantage of the present disclosure is that foaming can be further reduced by adding a control element 130 having a sinusoidal shape, as shown in Fig. 3A shown.

[0032] Fig. Figure 3B shows an edge comprising a control element 130 having a square shape, according to embodiments of the present disclosure.

[0033] At least one advantage of the present disclosure is that foaming can be further reduced by adding a control element 130 having a square shape, as shown in Fig. 3A shown.

[0034] Fig. Figure 3C shows a control element 130 having an edge with multiple slots, according to embodiments of the present disclosure.

[0035] At least one advantage of the present disclosure is that foaming can be further reduced by adding a control element 130 with multiple slots, as shown in Fig. 3C shown.

[0036] Fig. 3D shows an edge comprising a control element 130 having multiple holes, according to embodiments of the present disclosure.

[0037] At least one advantage of the present disclosure is that foaming can be further reduced by adding a control element 130 having multiple holes, as shown in Fig. Shown in 3D.

[0038] In situations where the edge of the outlet opening 120 is located above an instantaneous fluid level in the receiving vessel 210 of the air trap device 200, foam may form, or air may enter the fluid, for example, if fluid exiting the edge comprising a control element 130 of the nozzle 100 strikes the surface of the fluid in the receiving vessel 210. This is particularly true if the fluid contains protein molecules, for example, if the fluid is beer. At least one advantage of the present disclosure is that by ensuring a smooth introduction of the fluid received from the inlet 250 into the receiving vessel 210, foam formation is mitigated or reduced. Another advantage of the present disclosure is that the fluid flow is kept more constant by providing a funnel-shaped nozzle 100, which ensures a more constant fluid flow.A further advantage of the present disclosure is that foaming is further reduced by mitigating or reducing pulsations or fluctuations in the fluid flow through the addition of a control element 130. This is achieved by means of an edge encompassing the control element 130, which breaks the surface tension and thereby mitigates the formation of droplets that cause pulsations in the fluid flow. Foaming can be further reduced by adding a control element 130 having a sinusoidal shape, as shown in [reference]. Fig. Figure 3A shows that a further advantage of the present disclosure is that foam formation is further reduced by forcing the foam towards the instantaneous surface of the fluid in the receiving container 210. This is achieved by arranging the nozzle 100 in the upper part, for example in an upper half or in an upper quarter, of the tubular section.

[0039] These advantages are realized by the air trap device 200 and the nozzle 100 according to one or more embodiments of the present disclosure.

[0040] The nozzle 100 can further comprise a guide element 140, which is coupled to the body of the nozzle 100 and is configured to guide the fluid distributed along the edge of the outlet opening in a direction of gravity. The guide element 140 gently directs the fluid distributed along the edge 130 of the outlet opening 120 in a direction of gravity, thereby preventing foaming or the introduction of air into the fluid.

[0041] At least one further advantage of the present disclosure is that by ensuring a gentle introduction of the fluid received from the inlet 250 into the receiving container 210, thanks to the addition of a guiding element 140, foaming is mitigated or reduced.

[0042] Fig. Figure 4 shows a nozzle for an air trap device comprising a guide element, according to one or more embodiments of the present disclosure. The guide element 140 can be coupled to the body of the nozzle 100 by enclosing an outer wall 101 of the body of the nozzle 100 at a point between the inlet opening 110 and the outlet opening 120. In other words, it is coupled at a point along the outer wall 101 of the body of the nozzle 100 below the edge 130 in the direction of gravity.

[0043] In one example, the nozzle 100 is funnel-shaped and has an outer wall 101 that connects the inlet opening 110 and the outlet opening 120. The guide element 140 can then be shaped as a tube and aligned with its longitudinal axis in the direction of gravity, with an open end of the tube enclosing the outer wall of the nozzle body at a point between the inlet opening 110 and the outlet opening 120. The guide element 140 can be coupled to the nozzle 100, for example, by forming the nozzle 100 and the guide element 140 as an integral unit, by welding the nozzle 100 and the guide element 140 together, or by bonding the nozzle 100 and the guide element 140 together.

[0044] In one embodiment of the present disclosure, the guide element 140 has a dual function. The first function, as described above, is to guide the fluid distributed along the edge of the outlet opening in a direction of gravity, and the second function is to supply fluid to the nozzle from the fluid inlet of the receiving reservoir 210 of the air trap device 200. In other words, fluid is guided within an inner wall of the nozzle to the control element 130.

[0045] In one or more embodiments of the present disclosure, the guide element 140 comprises a tubular element that is coupled in a fluid-tight manner to the inlet opening 110 of the body of the nozzle 100 and can further be coupled to a fluid inlet 250 of the air trap device 200. The guide element 140 can be coupled to the body of the nozzle 100 by, for example, forming the nozzle 100 and the guide element 140 as an integral unit, welding the nozzle 100 and the guide element 140 together, or bonding the nozzle 100 and the guide element 140 together. The guide element 140 can be configured to be aligned with its longitudinal axis in the direction of gravity or to be aligned and centered on a longitudinal axis of the nozzle 100.

[0046] In some situations, it may be advantageous to supply fluid to nozzle 100 from a direction other than gravity. An embodiment that accomplishes this is described below.

[0047] Fig. Figure 5 shows a nozzle 100 for an air trap device 200, which has a guide element 140 and a feed element 150, according to one or more embodiments of the present disclosure. The nozzle 100 further comprises a feed element 150. The feed element 150 is configured to supply fluid to the nozzle 100 from the fluid inlet 250 of the receiving container 210 of the air trap device 200. The feed element 150 comprises a tubular element that is coupled to the inlet opening 110 of the body and can further be coupled to a fluid inlet 250 of the air trap device 200.

[0048] Fig. Figures 6A-B show an air trap device 200 according to one or more embodiments of the present disclosure. Fig. Figure 6A shows a drawing of the air trap device 200, and Fig. Figure 6B shows a sectional drawing of the air trap device 200.

[0049] The air trap device 200 is designed to remove air from the fluid. The device comprises a receiving container 210, which is designed to receive the fluid, and a nozzle 100 according to one of the embodiments described herein, which is contained in the receiving container 210.

[0050] The receiving vessel 210 comprises a lid section 220 and a drainage section 230, which includes an outlet 240 and an inlet 250. The outlet 240 is configured to direct fluid from the receiving vessel 210 to an external receiving unit, for example, a chromatography device. The inlet 250 is configured to supply fluid to the receiving vessel 210, for example, from an external source such as a fluid reservoir.

[0051] The air trap device 200 further comprises a tubular section 260 that connects the lid section 220 with the drainage section 230 to form a sealed and fluid-tight receiving vessel 210. In one example, this could be a tube made of glass or another suitable material.

[0052] An important principle of the present disclosure is that fluid entering the receiving vessel 210 via the inlet 250, regardless of the fluid's density and assuming a constant fluid flow rate through the inlet 250, takes essentially the same time to pass through the air trap device 200 and reach the outlet 240. This ensures precise compliance with a desired fluid gradient, for example, linear behavior when the fluid changes gradientally from a low-density to a high-density fluid over time. This is achieved by the air trap device 200 by supplying fluid to the receiving vessel 210 via the nozzle 100 at the top and drawing fluid away at the bottom of the receiving vessel 210 via the drainage section 230.

[0053] Another important principle is to allow any air still trapped in the fluid after exiting the control element 130 time to reverse its direction of movement from top to bottom due to buoyancy and return to the fluid's surface, thus further reducing the amount of air in the fluid. This is achieved by providing a tubular section 260 with a relatively large cross-section compared to the cross-section of the nozzle 100. This ensures a relatively low fluid flow rate from the edge 130 to the outlet 240 compared to the flow rate from the inlet 250 to the edge 130, further reducing the amount of air in the fluid.

[0054] In one or more embodiments, the nozzle 100 comprises a guide element 140, the cross-sectional area of ​​which is at most 1 / 10 of the cross-sectional area of ​​the tubular section 260. In one or more embodiments, the nozzle 100 comprises a guide element 140, the cross-sectional area of ​​which is at most 1 / 4 of the cross-sectional area of ​​the tubular section 260.

[0055] At least one advantage of the present disclosure is that further air is removed from the fluid by extending the time in which air embedded or trapped in the fluid can reverse its direction of movement from top to bottom and return to the surface of the fluid due to the buoyancy of the air in the fluid. This is ensured by the fact that the fluid flow rate in the receiving vessel 210 is lower compared to the fluid flow rate in the inlet 250. In other words, the larger the cross-section of the tubular section 260 is relative to the cross-section of the guide element 140, the lower the fluid flow rate in the top-to-bottom direction. The low fluid flow rate is achieved by a guide element 140 whose cross-sectional area is at most 1 / 10 or 1 / 4 of the cross-sectional area of ​​the tubular section 260.

[0056] In one example, the guide element 140 has a diameter of 10 mm, and the tubular section 260 has a diameter of 41 mm. The guide element 140 then has a cross-sectional area of ​​10 mm². 2 * π = 314, and the cross-sectional area of ​​the tubular section 260 is then 20.5 mm² 2 * π ≈ 1320. The guide element 140 then has a cross-sectional area of ​​≈ 1 / 4 of the cross-section of the tubular section 260.

[0057] In some situations, when the fluid flows from the control element 130 to the outlet 240, dead zones or stagnant zones form in some areas of the drainage section 230, where the fluid remains still. This problem is addressed by the embodiments in Fig. 7 and Fig. 8 solved, which are described in more detail below.

[0058] Fig. Figure 7 shows an air trap device having a drainage section comprising multiple openings, according to one or more embodiments of the present disclosure. The drainage section 230 of the air trap device 200 comprises multiple openings 810-840 facing the tubular section. Each opening is then coupled or connected to the fluid outlet 240, for example, by fluid channel elements. The multiple openings can comprise 2-10 openings or any other suitable number of openings. This embodiment reduces the formation of dead zones or stagnant zones by drawing off fluid at multiple points.

[0059] Fig. Figure 8 shows an air trap device 200 having a drainage section with a funnel shape, according to one or more embodiments of the present disclosure. The drainage section 230 of the air trap device 200 is configured with a funnel shape and has an opening facing the tubular section and coupled to the fluid outlet 240. The opening facing the tubular section can have a cross-section equal to the cross-section of the tubular section 260.

[0060] As mentioned above, it is desirable to have a relatively low fluid flow rate from edge 130 to outlet 240 compared to the fluid flow rate from inlet 250 to edge 130. This is achieved by the following embodiment, in which the cross-section of the tubular section 260 is further increased by an annular bulge 1010.

[0061] Fig. Figure 9 shows an air trap device comprising a tubular section 260 with an annular protrusion 9010, according to one or more embodiments of the present disclosure. The tubular section 260 may further have an annular protrusion 9010. This ensures a relatively low fluid flow rate from the control element 130 to the outlet 240 in relation to the flow rate from the inlet 250 to the edge 130, thereby further reducing the amount of air in the fluid.

[0062] Since the fluid generally has a higher density than air, it will attempt to flow downwards in the direction of gravity. Conversely, air trapped within the fluid, which has a lower density than the fluid, will attempt to move in a direction opposite to gravity. The air trap device 200 is therefore designed for use in which its longitudinal axis is aligned with the direction of gravity, such that the drainage section 230 is aligned with gravity and the cover section 220 is aligned in a direction opposite to gravity.

[0063] In one or more embodiments, the device is configured to operate when the cover section 220 is oriented in a direction opposite to the direction of gravity. In one or more embodiments, the device is configured to operate when the cover section 220 is oriented in a direction opposite to the direction of gravity and the drainage section 230 is oriented in the direction of gravity.

[0064] As described in more detail above, the air trap device 200 is designed to direct fluid from the control element 130 of the nozzle 100 to the outlet 240. It is desirable that the control element 130 be located above the surface of the fluid in the receiving container 210 so that any air still trapped in the fluid has time, after exiting the control element 130, to reverse its direction of movement from top to bottom due to the buoyancy of the air in the fluid and return to the surface of the fluid.

[0065] In one or more embodiments, the air trap device 200 is configured such that the outlet opening 120 or the control element 130 of the nozzle is located in an upper or uppermost section of the tubular section 260. In one or more embodiments, the air trap device 200 is configured such that the outlet opening 120 or the control element 130 of the nozzle is located in an upper half of the tubular section 260. In one or more embodiments, the air trap device 200 is configured such that the outlet opening 120 or the control element 130 of the nozzle is located in an upper quarter of the tubular section 260.In one or more embodiments, the air trap device 200 is arranged such that the outlet opening 120 or the control element 130 of the nozzle 100 is located in an upper 1 / 10 section of the tubular section 260, that is, the outlet opening 120 or the control element 130 of the nozzle is located in the upper 10% of the total height of the tubular section 260.

[0066] At least one advantage of this embodiment is that foam formation is further reduced by forcing the foam towards the current surface of the fluid in the receiving container 210. This is achieved by arranging the nozzle 100 in the upper part, for example in the upper half or upper quarter, of the tubular section. Another advantage is that the time is extended during which air embedded or trapped in the fluid can reverse its direction of movement from top to bottom and return to the surface of the fluid due to the buoyancy of the air in the fluid.

[0067] Fig. Figure 10 shows an exploded view of an example of the air trap device 200 according to one or more embodiments of the present disclosure. The exploded view shows the same features as those in the Fig. 1, Fig. 4 and Fig. 6 features shown: that is, a nozzle 100, a lid section 220, a drainage section 230 and a tubular section 260, for example a glass tube.

[0068] Furthermore, the air trap device includes 200: The air trap assembly 200 comprises a connector 1002, an air valve piston 1003, O-rings 1004-1005, a locking screw 1006, and an O-ring 1007 designed to seal the coupling between the tubular section 260 and the drainage section 230. The air trap assembly 200 further comprises a spacer screw 1008 designed to couple the cover 220. The air trap assembly 200 further comprises a drainage section 230 and a protective cover 1010 designed to protect the tubular section 260. The air trap assembly 200 further comprises a plug 1013 designed to fill a bore. The air trap assembly 200 further comprises a mounting screw 1014, for example, a flat head screw ISO 14583 M5x35 A4-70. The air trap device 200 also includes markings 1015-1016, which designate the inlet 250 and the outlet 240.

[0069] Fig. Figure 11 shows an example of the nozzle according to one or more embodiments of the present disclosure. An exemplary embodiment of the nozzle is shown in Fig. 11. The funnel shape of the nozzle has an opening angle of 23.4 degrees, as shown in section AA of Fig. 11 can be seen. The control element can comprise 6 sections, each of which comprises at least one full sine wave or period. Each section can correspond to 60 degrees of the control element 130. As seen from Fig. As can be seen in Figure 11, the control element can comprise six “valley” subsections with a radius of 2 mm and 12 “raise” sections with a radius of 4 mm.

[0070] Finally, it should be noted that the invention is not limited to the embodiments described above, but relates to and includes all embodiments within the scope of protection of the attached independent claims.

Claims

[1] Chromatography system with an air trap device (200) designed to remove air from a fluid, the air trap device includes: a receiving container (210) which is designed to receive the fluid, and a nozzle (100) which is arranged in the receiving container (210) and has: a body having an inlet opening (110) designed to receive the fluid, and an outlet opening (120) which is configured to distribute the fluid along an edge of the outlet opening (120), wherein the body of the nozzle (100) is funnel-shaped and the inlet opening (110) is smaller than the outlet opening (120), wherein the receiving container (210) comprises: a lid section (220), a drainage section (230) which has a fluid outlet (240) and a fluid inlet (250), and a tubular section (260) connecting the cover section (220) and the drainage section (230); and the nozzle (100) further comprises a guide element (140) which is coupled to the body of the nozzle and is configured to direct the fluid distributed along the edge of the outlet opening (120) in the direction of gravity, wherein the guide element (140) comprises a tubular element which is coupled to the inlet opening (110) of the body of the nozzle (100) and further to the fluid inlet (250) of the receiving container (210). [2] System according to claim 1, wherein the edge of the outlet opening (120) has a control element (130) which is configured to reduce the surface tension of the fluid and / or is sinusoidally shaped. [3] System according to claim 1 or 2, wherein the guide element (140) is arranged such that its cross-sectional area is less than 1 / 10 of the cross-sectional area of ​​the tubular section (260). [4] System according to one of the preceding claims, wherein the drainage section has several openings (810-840) facing the tubular section, each opening being coupled to the fluid outlet (240). [5] System according to one of the preceding claims, wherein the drainage section is designed with a funnel shape and has an opening facing the tubular section (260) and coupled to the fluid outlet (240). [6] System according to one of the preceding claims, wherein the tubular section (260) comprises an annular protrusion (1010). [7] System according to one of the preceding claims, wherein the device is configured to be operated when the cover section (220) is aligned in a direction opposite to the direction of gravity.

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