Hydrodynamic jack

Abstract

The invention relates to a hydrodynamic pipette (10, 10', 10", 10'") for at least partial immersion in a liquid, which pipette has a first volume (12) and a first volume limit (14) which at least partly delimits the first volume (12), wherein the first volume (12) has at least one first inlet opening (16) and at least one first outlet opening (18), wherein the at least one first inlet opening (16) is provided for letting the liquid into the first volume (12), and the at least one first outlet opening (18) is provided for letting out gas from the first volume (12).

Description

[0001] Hydrodynamic jack

[0002] The invention relates to a hydrodynamic lifter according to claim 1.

[0003] Floats or buoyancy aids are known for a wide variety of applications in everyday life.

[0004] For example, they are used in fishing, where they are also referred to by the technical term "float." The float or float serves several purposes. Firstly, it serves as a bite indicator. The float, which is visible to the angler on the water surface, moves as soon as a fish bites. Secondly, it often serves, for example, as a guide for a fishing line, at the end of which is a fishing hook with bait.

[0005] To balance the float, i.e. to ensure that it remains in the desired position and orientation in the water, at least as long as no fish has bitten, a weight must be attached to the float (e.g. attached directly to the float or connected to the float with a cord) or connected to the float in a force-locking manner, in order to prevent it from tipping over or otherwise being deflected from a desired position. Furthermore, it also requires a relatively high level of force to pull the float underwater, which, if the biting fish has not yet caught the hook when it tries to pull the bait back.

[0006] CONFIRMATION COPY below may cause the fish to release the bait or pull the bait off the hook.

[0007] Floats and buoyancy bodies are also known from numerous industrial applications in measurement and control technology. For example, floats are used in level measurement or as sensors or triggers for switching processes that depend on a liquid level, i.e., as float switches or float valves.

[0008] In industrial applications, too, it is essential that a float remains stable during use to achieve precise measurement results. Therefore, in industrial applications, a float must also be equipped with a tare weight.

[0009] Based on this, it is the object of the present invention to provide a device which ensures a stable position during use with a simplified or less complex handling or a simplified structure in contrast to the prior art.

[0010] This object is achieved according to the invention by a hydrodynamic lifter or gas-pressure float according to patent claim 1.

[0011] Accordingly, the object of the present invention is achieved by a hydrodynamic siphon or gas-pressure floating body for at least partial immersion in a liquid, which has a first volume and a first volume boundary that at least partially delimits the first volume, wherein the first volume has at least one first inlet opening and at least one first discharge opening, wherein the at least one first inlet opening is provided for the inflow of liquid into the first volume, and the at least one first discharge opening is provided for the discharge of gas from the first volume. This enables the siphon to remain stable in position when at least partially arranged in the liquid.

[0012] The first volume is optionally spherical, ellipsoidal, or hollow-cylindrical, ensuring a readily implementable variant of the siphon. The volume boundary of the first volume is preferably formed as a first boundary wall (i.e., wall-like), and the at least one first inlet opening and the at least one first outlet opening are furthermore preferably arranged in the first boundary wall. This also represents an advantageously implementable variant of a corresponding siphon.

[0013] In a further embodiment, the first volume can have a central axis extending in the axial direction thereof, and the first volume can have a first partial volume and a second partial volume, wherein the first partial volume and the second partial volume are arranged one above the other in the direction of extension of the central axis, and wherein the first partial volume extends from a lower boundary of the first volume to an upper edge or uppermost point of the at least one first discharge opening, and wherein the second partial volume extends from the upper edge or uppermost point of the at least one first discharge opening to the upper boundary of the first volume. Typically, when the siphon is in use, at least the largest part of the first partial volume is filled with liquid, while at least the largest part of the second partial volume is filled with gas.Due to the layering of the two partial volumes, the siphon floats on a "gas cushion" located on the liquid, or above the liquid, in such a way that at least sections of it protrude from the liquid surface in a stable position.

[0014] The lifter may optionally further comprise a second volume and a third volume, wherein

[0015] - the first volume, the second volume and the third volume are arranged around a central axis, in particular around a / the axial central axis of the first volume,

[0016] - the second volume has a second inlet opening connecting the first volume to the second volume,

[0017] - the third volume has at least one third inlet opening connecting the second volume to the third volume, and

[0018] - the third volume has at least one second discharge opening and at least one third discharge opening, each of which connects the third volume to the surroundings of the lifter. This design provides a lifter that remains in a desired position, with the desired position being easily adjustable.

[0019] Optionally, the second volume is arranged at least partially within the first volume, and optionally, the third volume is arranged at least partially within the second volume. This ensures a readily implementable functional variant of a corresponding lifter.

[0020] The second inlet opening and the third inlet opening can be provided for receiving and supplying liquid, respectively, and the second discharge opening can be provided for discharging gas, and the third discharge opening can in turn be provided for discharging liquid. Additionally or alternatively, the at least one first discharge opening can be arranged axially above the at least one third inlet opening. This advantageously allows the gas-liquid level in the respective volumes to be controlled or adjusted, ensuring the positional stability of the siphon.

[0021] In a further embodiment, the first volume, the second volume, and the third volume can be arranged concentrically around the central axis. Alternatively or additionally, the second volume and the third volume can be hollow-cylindrical. This results in a compact design with good functionality and positional stability.

[0022] The third volume optionally has a receptacle for a light source, in particular a glow stick or lightstick, or an electrically operated light source. This allows the user to visually detect the movement of the lifter. Alternatively or additionally, the lifter, in particular the second volume or the third volume, can have a receptacle for a position sensor, which enables, in particular, wireless, non-visual detection of its position. This enables industrial use, especially under difficult or non-existent visibility conditions.

[0023] The second volume is preferably sealed gas-tight against the environment of the jack, i.e. against its exterior or outer side, which ensures high functionality, especially with other design features of the three-volume jack.

[0024] The jack may have a tare weight and / or an eyelet, in particular an eyelet provided for threading a fishing line, to support use in fishing.

[0025] The at least one first inlet opening, the at least one second inlet opening, the at least one third inlet opening and the at least one third discharge opening are preferably provided for an arrangement thereof below a liquid surface, and the at least one first discharge opening and the at least one second discharge opening are preferably provided for an arrangement thereof above a liquid surface.

[0026] In a further embodiment, the at least one first inlet device and the at least one first outlet device are each designed as a hollow cylindrical volume or as a tube, wherein the at least one first inlet device has a radial extension, i.e. a diameter rZ, and wherein the at least one first outlet device has a radial extension, i.e. a diameter rA, where rZ>rA, wherein the at least one first outlet device projects into the at least one first inlet device in the axial direction. During operation of the siphon, as in the three-volume embodiments described above, a siphon-like effect occurs in that gas escaping from the first volume has to push back the liquid level in the first inlet device far enough that it can escape through the at least one first outlet device projecting into the at least one first inlet device.

[0027] The invention will be described below by way of example with reference to the accompanying drawings using preferred embodiments. In the drawings,

[0028] Fig. 1a shows a first embodiment of a hydrodynamic lifter according to the invention in a sectional view, cut along its axial center axis;

[0029] Fig. lb shows the first embodiment of a hydrodynamic lifter according to the invention in a sectional view, cut perpendicular to its axial center axis;

[0030] Fig. 2 shows a second embodiment of a hydrodynamic lifter according to the invention in a schematic representation;

[0031] Fig. 3 shows a third embodiment of a hydrodynamic lifter according to the invention in a schematic representation; and

[0032] Fig. 4 shows a fourth embodiment of a hydrodynamic lifter according to the invention, again in a schematic representation.

[0033] A first possible embodiment of a hydrodynamic lifter 10 or gas-pressure float according to the invention is shown in Fig. 1a and Fig. 1b. For the sake of brevity, in some places below, only the term "lifter" is used instead of the full term "hydrodynamic lifter," where "lifter" refers to the hydrodynamic lifter.

[0034] As can be seen from the figures, it has a first volume 12 and a first volume boundary 14 delimiting the first volume. In the embodiment of Fig. 1a and Fig. 1b, the first volume boundary 14 is hollow-cylindrical. The first volume boundary is in the form of a boundary wall formed from an upper boundary wall 14a (upper boundary of the first volume 12) and a lateral boundary wall 14b (lateral boundary of the first volume 12). A lower boundary wall (lower boundary of the first volume 12) is not present in the described embodiment, as will be explained in more detail below.

[0035] The first volume 12 has a first inlet opening 16 formed in the first volume boundary 14 and three first discharge openings 18 also formed in the first volume boundary 14. The first discharge openings 18 are distributed uniformly, ie at 120° intervals, over the circumference of the first volume boundary 14, as can be seen from Fig. 1b.

[0036] The first discharge openings 18 are designed as recesses in the first volume limitation

[0037] 14, more precisely, in the lateral boundary wall 14b of the first volume 12, are formed as circular holes in the described embodiment. In alternative embodiments, angular or geometrically differently shaped recesses are also conceivable; likewise, holes do not necessarily have to be used; rather, recesses created by milling or punching or another method for producing recesses can also be used.

[0038] The first inlet opening 16 is formed as a recess in the first volume boundary 14. The first inlet opening 16 extends from an axial center axis 20 of the first volume 12 to a radial boundary of the first volume 12. In the described embodiment of Fig. 1a and Fig. 1b, this is an extension from the axial center (axial center axis 20) of the first volume 12 to the lateral boundary wall 14b of the first volume 12.

[0039] The first inlet opening 16 is provided for the inflow of liquid into the first volume 12. The first outlet openings 18 are provided for the discharge of gas from the first volume 12.

[0040] The hydrodynamic lifter 10 may further comprise a buoyancy weight 22, which, in the described embodiment, is attached to the upper boundary wall 14a of the volume 12. The buoyancy weight 22 is attached to the upper boundary wall 14a by means of a cord 24 or a chain and further supports the positional stability of the lifter 10.

[0041] In alternative embodiments, the first volume 12 may be formed in a different geometry, for example spherical or as an ellipsoid.

[0042] The first volume 12 has the axial central axis 20, which extends through the center, more precisely the midpoint of the upper end wall 14a and the lower end wall (which is replaced by a recess in the embodiment of Fig. 1a and Fig. 1b) of the first volume 12. The first volume 12 further has a first partial volume 12a and a second partial volume 12b. The first partial volume 12a and the second partial volume 12b are arranged one above the other in the direction of extension of the axial central axis 20. The first partial volume 12a extends from the lower end wall of the first volume 12, which, as described in more detail above, is replaced by the first inlet opening 16 (recess) in the embodiment presented here, up to an upper edge or an uppermost point of the three first discharge openings 18. It should be noted here that the three first discharge openings 18 are all at the same axial height.The second partial volume 12b of the first volume 12 extends from the upper edge or the uppermost point of the first discharge openings 18 to the upper side wall 14a of the first volume 12.

[0043] If the siphon 10 is located in a liquid, the first partial volume 12a is filled with the liquid and the second partial volume 12b is at least partially filled with gas or the atmosphere surrounding the liquid, such that the siphon 10 floats on a gas cushion in a stable position in an upright position (i.e. with the axial center axis perpendicular to a liquid surface W). Depending on the weight and density of the siphon 10, almost any height of the gas cushion in the second partial volume 12b can be achieved and the force that has to be applied to pull the siphon 10 under water can therefore also be adjusted; by moving the siphon (for example by means of a fishing line connected to it), gas can also be caused to escape from the second partial volume 12b via one or, if necessary,also several, preferably via one of the first discharge openings 18, and thus the force required to pull the siphon below the liquid surface W is reduced. This is particularly relevant for fishing.

[0044] Fig. 2 shows a schematic representation of a second embodiment of a hydrodynamic siphon 10' according to the invention. The siphon 10' has, in addition to the first volume 12, which is ellipsoidal in the embodiment of Fig. 2, a second volume 102 and a third volume 104. The first volume 12, the second volume 102, and the third volume 104 are arranged around the axial center axis 20 of the first volume 12, which simultaneously forms the axial center axis of the second volume 102 and the third volume 104. In other words, the first volume 12, the second volume 102, and the third volume 104 are arranged concentrically around the axial center axis 20. The second volume 102 and the third volume 104 are hollow cylindrical, while the first volume, as mentioned above, is ellipsoidal in the embodiment described here.In alternative embodiments, the first volume 12, the second volume 102 and the third volume 104 may each be formed as a different geometric body, for example as a sphere, as a hollow cylinder or as an ellipsoid.

[0045] The first volume 12 has the smallest axial extent, the second volume 102 has the second smallest axial extent, and the third volume 104 has the largest axial extent. The second volume 102 and the third volume 104 are each arranged within the first volume 12 over the entire axial extent thereof and each protrude beyond it in the axial direction.

[0046] The first volume has first inlet openings 16 and first outlet openings 18. In the embodiment of Fig. 2, three first inlet openings 16 are present, each of which is (radially) evenly distributed (at an angle of 120°) and arranged at the same axial height, the so-called first inlet opening axial height. In the embodiment of Fig. 2, three first outlet openings 18 are also present, each of which is (radially) evenly distributed (at an angle of 120°) and arranged at the same axial height, the so-called first outlet opening axial height. In alternative embodiments, fewer than three or more than three first inlet openings 16 are also conceivable, which are in particular evenly distributed and arranged at the same axial height (first inlet opening axial height).In alternative embodiments, in addition to or as an alternative to the above-described modification of the second embodiment, fewer than three or more than three first discharge openings 18 are also conceivable, which are arranged in particular evenly distributed, each at the same axial height (first discharge opening axial height).

[0047] The first inlet openings 16 are arranged in an outer wall 106 of the first volume, while the first outlet openings 18 are arranged in an outer wall 108 of the second volume 102, which simultaneously forms an inner boundary of the first volume 12 (virtually an inner wall of the volume 12), at an axial height at which the second volume 102, with its outer wall 108, is arranged within the first volume 12. The first outlet openings 18 connect the first volume 12 to the second volume 102.

[0048] The second volume 102 has three second inlet openings 110, which also connect the first volume 12 to the second volume 102. The second inlet openings 110 are each (radially) evenly distributed (at an angle of 120°) and arranged at the same axial height, the so-called second inlet opening axial height. The second inlet openings 110 are arranged in the outer wall 108 of the second volume 102, specifically at an axial height at which the second volume 102, with its outer wall 108, is arranged within the first volume 12.

[0049] The third volume 104 has a third inlet opening 114 that connects the second volume 102 to the third volume 104. The third inlet opening 114 is arranged in an outer wall 116 of the third volume 104, specifically at an axial height, the so-called third inlet opening axial height, at which the third volume 104, with its outer wall 116, is arranged within the second volume 102 and further at a height that is also surrounded by the first volume 12. Furthermore, the third volume 104 has a second discharge opening 118 and a third discharge opening 120, each of which connects the third volume 104 to the surroundings of the siphon 10'. The second discharge opening 118 is arranged on an upper end face 122 of the third volume 104 and is intended to connect the third volume 104 with the surrounding atmosphere (gas) of the siphon 10'.The third discharge opening 120 is arranged on a lower end face 124 of the third volume 104 and is intended to connect the third volume 104 with the liquid on or in which the siphon 10' is in use.

[0050] The first inlet openings 16 and the second inlet openings 110 are provided for receiving or supplying / supplying liquid, and the third inlet opening 114 is provided for receiving or supplying / supplying liquid or gas, depending on the prevailing pressure conditions. The first discharge openings 18 and the second discharge opening 118 are provided for discharging gas, and the third discharge opening 120 is provided for discharging liquid. For this purpose, the first inlet openings 16, the second inlet openings 110, the third inlet opening 114, and the third discharge opening 120 are provided for being arranged below a liquid surface W, and the first discharge openings 18 and the second discharge openings 118 are provided for being arranged above a liquid surface W (each during operation of the siphon). The second volume 102 is sealed gas-tight against the surroundings of the lifter 10', ie against its outside.

[0051] The third volume 104 has a receptacle for a light source 126, in particular a glow stick or a light rod, or even an electrically operated light source. Alternatively, the third volume 104 can have a receptacle for a position sensor, for example, a piece of precious metal or the like, by means of which the position of the receptacle can be detected, in particular inductively or non-visually, but alternatively can also be detected or determined visually.

[0052] The lifter may have a tare weight 128 and / or an eyelet 130, in particular an eyelet 130 provided for threading a fishing line.

[0053] Another possible embodiment, namely a third possible embodiment, of a hydrodynamic lifter 10" is shown in Fig. 3. The third embodiment essentially corresponds to the second embodiment with the exception of the fact that in the third embodiment, the third inlet opening 114, which is arranged in the outer wall 116 of the third volume 104, is - as in the second embodiment - at an axial height at which the third volume 104 with its outer wall 116 is arranged within the second volume 102, but is not arranged at an axial height that is also surrounded by the first volume 12. Rather, the third inlet opening 114 is arranged at an axial height that is not surrounded by the first volume 12, i.e., which lies outside the first volume 12.

[0054] A fourth exemplary embodiment is shown in Fig. 4. The hydrodynamic lifter 10"' according to the fourth embodiment again has the first volume 12, which is formed in the shape of an ellipsoid.

[0055] Furthermore, the lifter 10'" has a first inlet device 202 and a first outlet device 204, which are each designed as a hollow cylindrical volume open on both end faces or alternatively provided with an opening on both end faces or as a tube. The first inlet device 202 passes through the volume boundary 14 (boundary wall), more precisely through the first inlet opening 16, and has a first inlet device section 202a, which projects into the first volume 12, and has a second inlet device section 202b, which projects out of the first volume 12. The first outlet device 204 passes through the volume boundary 14 (boundary wall), more precisely through the first outlet opening 18, and has a first outlet device section 204a, which projects into the first volume 12, and has a second outlet device section 204b, which projects out of the first volume 12. stands out.

[0056] The first inlet device 202 has a radial extension, i.e., a diameter rZ, and the first outlet device 204 has a radial extension, i.e., a diameter rA. rZ>rA applies. In the axial direction, the first outlet device 204 extends with a portion of its first outlet device portion 204a, which projects into the first volume 12, into a portion of the first inlet device portion 202a, which projects into the first volume 12. As already mentioned above, both the first inlet device 202 and the first outlet device 204 are open at their respective end faces, so that liquid or gas can enter and exit.

[0057] In alternative embodiments, the first discharge device 204 may also extend into the second discharge device section 204b, which protrudes from the first volume 12.

[0058] In further alternative embodiments, the volume boundary 14 of the first volume 12 may have liquid level establishment openings to establish the liquid level in the first volume 12 upon liquid contact. In this case, the first inlet device 202 could be replaced by these liquid level establishment openings (as inlet openings).

[0059] Based on this construction, it is easily apparent that after a partial filling of the first volume 12 with liquid (the liquid level is created when the siphon 10"' comes into contact with a liquid by the liquid flowing in via the first inlet device 202, which functionally forms or replaces the first inlet opening(s) of the embodiments described above), the first inlet device 202 and the first discharge device 204 form a siphon, which, under appropriate pressure conditions inside the first volume, allows the gas to escape and a further flow of liquid to occur.

[0060] The same siphon-like effect occurs in the embodiments of Fig. 2 and Fig. 3, whereby, for example, when a fish bites, the siphon can be pulled into the liquid with relatively little effort, whereby the gas cushion escapes through the discharge opening to the outside of the siphon. For this purpose, in the embodiments of Fig. 2 and Fig. 3, in an upright operating position of the siphon (the upright operating position of the siphon is shown in each of the figures), the third inlet opening axial height is arranged below the first discharge opening axial height. In other words, the first discharge openings 18 are spaced from and in the operating position of the siphon above the third inlet opening 114, optionally in alternative embodiments, the third inlet openings 114. The axial distance ieThe height (i.e. the distance extending in the axial direction) between the first discharge openings 18 of the third inlet opening 114 defines the height of the effective siphon.

[0061] It should be mentioned that all the lifters shown can be used in the field of fishing and also in the field of industrial applications, but in the industrial field an embodiment according to Fig. 3 will be preferred.

[0062] If the hydrodynamic siphon of Figures 2, 3 or 4 is used for fishing, the siphon can be filled with liquid before casting in order to achieve the desired casting distance. Water, in particular water from the body of water to be fished, is a suitable liquid; in a simple case, filling takes place via the inlet opening(s) of the first volume. It should be noted that the openings, in particular the inlet openings, are not closed after filling with liquid and before or during casting, since the design according to the invention always provides a connection to the surrounding atmosphere, so that the liquid level is adjusted accordingly through the inlet opening(s) even if some liquid escapes during casting.

[0063] The inlet openings, which in the described embodiments are designed as holes / bores approximately evenly distributed over the circumference of the first volume, but in alternative embodiments can also be designed as slots extending particularly in the axial direction, enable targeted immersion for floating at an optimal immersion depth. Likewise, a movement (so-called "tugging" in fishing jargon) on the fishing line after casting allows the lifter to sink further to establish a so-called bite resistance, i.e., the resistance already mentioned above to pull the lifter underwater.

[0064] It should be noted at this point that the hydrodynamic lift described—unlike floats or buoyancy bodies—does not utilize the Archimedes principle, but rather floats on a gas cushion above the liquid. This also explains the designation of the subject matter of the application as a hydrodynamic lift.

[0065] It should be added that, particularly for industrial applications, for example in the field of measurement and control technology, there is a simple way to adjust the height of the siphon on the liquid, or more precisely on the liquid surface, in a closed volume by increasing or decreasing the pressure of the gas contained in the closed volume. This allows the siphon floating on a liquid in the closed volume to rise or fall. This results in a variably usable and adjustable measuring sensor or level indicator. In one possible embodiment, the siphon position is measured inductively, as explained above, for example by detecting a position sensor (usually made of metal) permanently connected to the siphon.

[0066] Although the invention is described using embodiments with fixed combinations of features, it also encompasses conceivable further advantageous combinations, as specifically, but not exhaustively, specified by the subclaims. All features disclosed in the application documents are claimed as essential to the invention, insofar as they are novel, individually or in combination, over the prior art.

[0067] List of reference symbols:

[0068] 10, 10', 10", 10"' hydrodynamic lifter 12 first volume 12a first partial volume of the first volume 12 12b second partial volume of the first volume 12

[0069] 14 first volume limitation

[0070] 14a upper boundary wall

[0071] 14b side boundary wall

[0072] 16 first inlet opening

[0073] 18 first discharge opening

[0074] 20 axial center axis of the first volume

[0075] 22 tare weight

[0076] 24 cord

[0077] 102 second volume

[0078] 104 third volume

[0079] 106 Outer wall of the first volume 12

[0080] 108 Outer wall of the second volume 102

[0081] 110 second inlet opening

[0082] 114 third inlet opening

[0083] 116 Outer wall of the third volume 104

[0084] 118 second discharge opening

[0085] 120 third discharge opening

[0086] 122 upper front side of the third volume

[0087] 124 lower front side of the third volume

[0088] 126 lamps

[0089] 128 tare weight

[0090] 130 eyelet

[0091] 202 first inlet device 202a first inlet device section of the first inlet device 202

[0092] 202b second inlet device section of the first inlet device 202 204 first discharge device

[0093] 204a first discharge device section of the first discharge device 204

[0094] 204b second discharge device section of the first discharge device 204 206 liquid level establishment opening W liquid surface

Claims

Patent claims. Hydrodynamic siphon (10, 10', 10". 10'") for at least partial immersion in a liquid, which has a first volume (12) and a first volume boundary (14) at least partially delimiting the first volume (12), wherein the first volume (12) has at least one first inlet opening (16) and at least one first outlet opening (18), wherein the at least one first inlet opening (16) is provided for an inlet of the liquid into the first volume (12), and the at least one first outlet opening (18) is provided for a discharge of gas from the first volume (12). Hydrodynamic siphon (10, 10', 10". 10'") according to claim 1, wherein the first volume (12) is spherical or ellipsoidal or hollow cylindrical. Hydrodynamic siphon (10, 10', 10").10'") according to one of the preceding claims, wherein the volume boundary (14) of the first volume (12) is formed as a first boundary wall (14a, 14b) and wherein the at least one first inlet opening (16) and the at least one first discharge opening (18) are arranged in the first boundary wall (14a, 14b). Hydrodynamic lifter (10, 10', 10". 10'") according to one of the preceding claims, wherein the first volume (12) has a central axis (20) extending in the axial direction thereof. and the first volume (12) has a first partial volume (12a) and a second partial volume (12b), wherein the first partial volume (12a) and the second partial volume (12b) are arranged one above the other in the extension direction of the central axis (20), and wherein the first partial volume (12a) extends from a lower boundary of the first volume (12) to an upper edge or uppermost point of the at least one first discharge opening (18), and wherein the second partial volume (12b) extends from the upper edge or uppermost point of the at least one first discharge opening (18) to the upper boundary of the first volume (12). Hydrodynamic siphon (10, 10', 10". 10'") according to one of the preceding claims, wherein the siphon (10, 10', 10". 10'") further has a second volume (102) and a third volume (104), wherein - the first volume (12), the second volume (102) and the third volume (104) are arranged around a central axis, in particular around a / the axial central axis (20) of the first volume (12), - the second volume (102) has at least one second inlet opening (110) connecting the first volume (12) to the second volume (102), - the third volume (104) has at least one third inlet opening (114) connecting the second volume (102) to the third volume (104), and - the third volume (104) has at least one second discharge opening (118) and at least one third discharge opening (120), which each connect the third volume (104) to the surroundings of the siphon (10, 10', 10". 10'"). Hydrodynamic siphon (10, 10', 10". 10'") according to claim 5, wherein the second volume (102) is arranged at least partially within the first volume (12), and wherein the third volume (104) is arranged at least partially within the second volume (102). Hydrodynamic lifter (10, 10', 10". 10'") according to claim 5 or 6, wherein the second inlet opening (110) and the third inlet opening (114) are provided for receiving liquid and the second discharge opening (118) is provided for discharging gas and the third discharge opening (120) is provided for discharging liquid. Hydrodynamic siphon (10, 10', 10". 10'") according to one of claims 5 to 7, wherein the at least one first discharge opening (18) is arranged in the axial direction above the at least one third inlet opening (114). Hydrodynamic siphon (10, 10', 10". 10'") according to one of claims 5 to 8, wherein the first volume (12), the second volume (102), and the third volume (104) are arranged concentrically around the central axis, in particular around the axial central axis (20) of the first volume (12). Hydrodynamic siphon (10, 10', 10". 10'") according to one of claims 5 to 9, wherein the second volume (102) and the third volume (104) are hollow-cylindrical. Hydrodynamic lifter (10, 10', 10". 10'") according to one of claims 5 to 10, wherein the third volume (104) has a receptacle for a lighting means (126), in particular a glow stick or light stick or an electrically operated lighting means. Hydrodynamic lifter (10, 10', 10").10'") according to one of claims 5 to 11, wherein the second volume (102) is sealed gas-tight against the environment of the siphon (10, 10', 10". 10'"). Hydrodynamic siphon (10, 10', 10". 10'") according to one of claims 5 to 12, wherein the siphon (10, 10', 10". 10'") has a taring weight (22, 128) and / or an eyelet (30), in particular an eyelet provided for threading a fishing line. Hydrodynamic siphon (10, 10', 10". 10'") according to one of claims 5 to 13, wherein the at least one first inlet opening (16), the at least one second inlet opening (110), the at least one third inlet opening (114) and the at least one third discharge opening (120) are designed for an arrangement thereof are provided below a liquid surface (W), and wherein the at least one first discharge opening (18) and the at least one second discharge opening (118) are provided for an arrangement thereof above a liquid surface (W).