Suction chamber and suction jet pump

Abstract

This invention relates to a suction chamber (10) for a working medium pump used to pump working medium stored in a working medium container of a motor vehicle. The suction chamber includes a housing (20) with at least two inlet openings (31, 32) for allowing the working medium to enter a connector (60) formed on the upper side of the housing (20). A steering wall (51, 52) is provided in the housing (20) between each inlet opening (31, 32) and the connector (60). Side recesses (81, 82) are formed inside the inlet openings (31, 32). The invention also relates to a suction jet pump or working medium pump comprising at least one such suction chamber (10).

Description

Technical Field

[0001] The technology disclosed herein relates to a suction chamber for a working medium pump used to suction working medium stored in a working medium container in a motor vehicle. The technology disclosed herein also relates to a suction jet pump or working medium pump having such a suction chamber. Background Technology

[0002] Working medium containers are typically used to store liquid working media such as fuel, water, or additives used for exhaust aftertreatment in motor vehicles. These containers are typically constructed to fit the installation space within the vehicle to maximize its utilization. This also means that areas within the working medium container are actively pumped in by the working medium pump for better availability, delivering the working medium to a collection point, such as a vortex tank. Therefore, even at low levels, complete or at least substantially complete extraction of the working medium is ensured.

[0003] Such working medium pumps can be configured, for example, as suction-jet pumps. They can, for example, have a suction chamber for receiving the working medium at a defined location within the working medium container. Summary of the Invention

[0004] A preferred objective of the technology disclosed herein is to reduce or eliminate at least one drawback of known solutions, or to suggest an alternative. In particular, a preferred objective of the technology disclosed herein is to provide a suction chamber for a working medium pump that is better and / or easier to operate compared to the prior art. Other preferred objectives can be derived from the beneficial effects of the technology disclosed herein.

[0005] The technology disclosed herein relates to a suction chamber for a working medium pump used to pump working medium stored in a working medium container of a motor vehicle. The suction chamber includes: (i) a housing, the lower side of which is configured to rest against the bottom of the working medium container, and at least one connector formed in the upper side of the housing for wiring of the working medium pump. Preferably, at least one first inlet opening and a second inlet opening are formed on the side of the housing for allowing the working medium to enter the connector. Preferably, a steering wall is provided in the housing between each inlet opening and each connector.

[0006] Preferably, a side recess is formed inside at least one entry opening. The side recess can be provided directly inside the entry opening, or directly adjacent to the entry opening.

[0007] With the aid of such a suction chamber, suction can be achieved from above, thus significantly reducing the horizontal structural space requirements compared to embodiments with connectors positioned sideways or horizontally. The working medium can be easily fed sideways into the housing through two inlet openings for subsequent suction via the connector. The deflecting wall ensures that the working medium is guided to the connector and at least partially prevents its outflow, for example, during sloshing motion.

[0008] The side recess defines a space through which the working medium does not flow directly into the inlet opening. If the working medium flows through this space, a vortex is thus formed. This vortex generates negative pressure and therefore suction, which draws other working medium into the suction chamber. This is maintained not only by the suction of the working medium through the connector but also by the outflow of the working medium through other inlet openings. Here, the outflow is restrained to such an extent that the space below the connector is filled with working medium to achieve effective suction, but outflow remains possible in order to maintain the vortex.

[0009] The suction chamber is specifically designed for drawing working medium from a working medium container using a working medium pump. This chamber receives the working medium at a defined location. Here, the lower side typically rests against the bottom of the working medium container; this resting can be complete or partial. Surrounding working medium can flow in through an inlet opening to reach the connector. The deflecting wall can, in particular, be configured as a vertical wall and guide the flow of the working medium.

[0010] In particular, lateral recesses can be formed on the inner side of some or all of the inlet openings. Therefore, the function of vortexes on multiple or all inlet openings can be implemented.

[0011] In particular, one, some, or all of the side recesses can be formed by protrusions in the housing, preferably protruding directly into the opening. The protrusions can be formed, in a planar manner and / or in a plane, particularly at least partially, particularly directly into the opening. The protrusions can be attached to the rest of the housing, for example, by rounding.

[0012] One, some, or all of the protrusions can be aligned with the inlet opening, particularly in a plane. Therefore, the working medium flowing in laterally to the inlet opening immediately sees a space that widens when viewed in a direction of approximately 90 degrees. This promotes the formation of vortices.

[0013] One, some, or all of the protrusions may preferably form an angle of at least 45° and / or a maximum of 90° with the section directly adjacent to the shell. This allows for the formation of suitable spaces in which vortices can be created.

[0014] In one embodiment, at least one third inlet opening is formed on the side of the housing for allowing the working medium to enter the connector. In another embodiment, at least one fourth inlet opening is formed on the side of the housing for allowing the working medium to enter the connector. Therefore, the number of inlet openings can be increased, and the working medium can flow to the connector from more sides.

[0015] The inlet openings can be formed, in particular, elongated on multiple side surfaces of the housing. This allows for easy inflow of the working medium. In particular, if the suction chamber is mounted on the bottom of the working medium container, then the inlet openings can extend all the way to the bottom of the working medium container.

[0016] Each entry opening can, in particular, have the same angular spacing as its corresponding circumferentially adjacent entry opening. This allows for a uniform implementation. However, other implementations are also possible.

[0017] The inlet openings and / or the turning walls can be invariant, in particular, compared to a certain angle, which is 360° divided by the number of inlet openings, or an integer multiple of that quotient. This allows for corresponding symmetry and thus allows for the simple manufacture of the suction chamber.

[0018] The deflection wall and / or other components of the housing can form a corresponding channel, particularly from the inlet opening toward the connector, with the channel having a cross-section that decreases toward the connector along at least one section. Therefore, flow resistance can remain low externally, but fluid flow increases toward the connector with decreasing distance.

[0019] The cross-section can be viewed, in particular, at least roughly transversely to the flow direction of the inflowing working medium.

[0020] An additional connector can be formed on the upper side of the housing, which can be positioned directly adjacent to the first connector. This can mean, in particular, that there is only a small distance between the first connector and the second connector, especially compared to the total extension dimension of the housing. Therefore, not only can suction be performed, but a driving jet can also be supplied, which allows the suction function to be realized by generating negative pressure within the suction chamber.

[0021] A drive nozzle and a mixing chamber can be specifically provided within the housing, wherein the drive nozzle can be specifically aligned with the mixing chamber and can be specifically connected to the additional connector on the input side, and the mixing chamber can be specifically connected to the connector on the output side and can specifically have an opening leading to the interior of the housing. Therefore, by means of such a drive nozzle and mixing chamber, a suction function can be achieved within the suction chamber by means of a drive jet, wherein the drive jet typically enters the suction chamber through the additional connector, reaches the mixing chamber via the drive nozzle, and exits the suction chamber again via the connector. At this time, a negative pressure is generated in the suction chamber, which can actively draw in the surrounding working medium.

[0022] The drive nozzle and mixing chamber can be housed in a single module that can be removed from the housing. This allows for a modular structure, where the suction chamber can be used either with or without such a module. In case of failure, replacing the module may suffice.

[0023] In one embodiment, a flow control structure is provided on the inlet opening outside the corresponding turning wall. Specifically, each inlet opening may be equipped with a corresponding flow control structure. The flow control structure may extend, in particular, along a corresponding line. The line may be straight or curved.

[0024] The flow control structure can be used to control the inflow and outflow of the working medium, in particular, ensuring that, for example, the working medium flows into the suction chamber more easily than flows out of the suction chamber.

[0025] The flow control structure, or a number of flow control structures, or all of the flow control structures, may have multiple first flow resistance elements and multiple second flow resistance elements, which are alternately arranged along corresponding lines. Each first flow resistance element may be tapered in the outflow direction, and each second flow resistance element may be teardrop-shaped in cross-section, wherein the tip of the teardrop shape points inward toward the interior of the housing. In this manner, it is advantageous to achieve that the working medium can flow in with the least possible flow resistance, and that when the working medium flows out of the suction chamber, a significantly higher flow resistance can be observed.

[0026] Here, the line can be defined individually, particularly for each entry opening. The line can extend, for example, along the outer edge of the housing, or slightly offset inward from the outer edge, and particularly parallel to or at a predetermined angle to the outer edge.

[0027] The first flow resistance element can be configured, particularly in a triangular or arrowhead shape in cross-section, which can be viewed transversely to the vertical axis. Here, the tip can point outwards. The teardrop-shaped configuration of the second flow resistance element can be achieved in such a way that the bulging region of the corresponding teardrop shape points outwards, thereby increasing the flow resistance. The described embodiment has proven particularly advantageous because it hardly impedes the inflow of the working medium, but significantly impedes its reflow.

[0028] Alternatively, the flow control structures can be configured, for example, as walls that interrupt the corresponding lines. This allows for simpler implementations. Combinations of implementations are also possible.

[0029] The connector can be configured, in particular, as an opening for a line to pass through. The other connector can also be configured as an opening for a line to pass through. This allows for a simple implementation.

[0030] The connector can be configured as a line extending into the housing. The other connector can also be configured as a line extending into the housing. Such a line can, for example, be directly connected to the wiring of the working medium pump.

[0031] The lower side of the housing can, in particular, lie in a plane. This allows it to rest against the flat bottom of the working medium container. However, the lower side can also be structured in a suitable manner, especially to complement such a bottom, in order to better fit a structured bottom.

[0032] Advantageously, the suction chamber is completely sealed on its upper side outside the connector and / or the other connector. This prevents the working medium in the suction chamber from escaping on the upper side. This facilitates the suction of the working medium and maintains flow through the suction chamber.

[0033] The technology disclosed herein also relates to a suction jet pump or working medium pump, comprising: (i) at least one electric pump unit, and (ii) at least one suction chamber as described herein, wherein the connector or the additional connector of the suction chamber is flow-directly connected to the pump unit. Thus, the suction chamber can be ideally used in a suction jet pump. In particular, the working medium pump can be a suction jet pump, or a suction jet pump can be a working medium pump.

[0034] A preferred working medium is fuel. Similarly, the techniques disclosed herein can be considered for storing other liquids (e.g., water or aqueous solutions) in motor vehicles. Even though working medium containers, working medium pumps, and the like are discussed herein, conceptual fuel containers and fuel pumps should also be similarly disclosed.

[0035] The working medium container can, in particular, constitute a storage volume for storing the working medium. The working medium container thus forms a substantially flow-tight outer shell of the storage volume and limits the storage volume relative to the installation space. In the case of plastic containers, blow-molded parts are mentioned, for example. In the case of steel containers, the working medium container can, for example, consist of two metal shells. Advantageously, the working medium container can have a saddle shape, comprising a main chamber and a secondary chamber, which are interconnected via a connecting area. The working medium pump can, in particular, be a passive pump, especially a suction-jet pump. Suction-jet pumps are known in themselves.

[0036] In other words, the entry of fuel or working medium into the suction point can be facilitated or simplified by setting multiple inlets. The suction point can be configured as an active or passive suction point. Mirror-image variations of the mold insert or separation of the upper (cap) and lower (labyrinth) components can also be implemented. The intentional introduction of vortices and anti-vortices to minimize pressure loss is also achieved. Lateral connections between individual arms or blades are possible. For example, mirror symmetry can be established. Attached Figure Description

[0037] The technology disclosed herein will now be illustrated with the aid of the accompanying drawings. The drawings are as follows:

[0038] Figure 1 A perspective view showing the suction chamber;

[0039] Figure 2 show Figure 1 A schematic diagram of the suction chamber;

[0040] Figure 3 A schematic diagram showing another suction chamber;

[0041] Figure 4 A schematic diagram showing another suction chamber;

[0042] Figure 5 A schematic diagram showing another suction chamber;

[0043] Figure 6 A schematic diagram of another suction chamber is shown; and

[0044] Figure 7 The module shown has a drive nozzle and a mixing chamber. Detailed Implementation

[0045] Figure 1 The diagram schematically shows a perspective view of a suction chamber 10 according to one embodiment, viewed from below. The suction chamber 10 has a housing 20 that defines the outline of the suction chamber 10.

[0046] The housing 20 has a first entry opening 31, a second entry opening 32, and a third entry opening 33. These openings point to the sides and allow the surrounding working medium to enter laterally.

[0047] The housing 20 has an upper side 21 and a lower side 22. The lower side 22 is currently flat and is divided into multiple sections along a path due to the entry openings 31, 32, 33. The lower side 22 can rest against the smooth bottom of the working medium container such that only the entry openings 31, 32, 33 are open to the side.

[0048] Accordingly, a corresponding flow control structure 41, 42, 43 is provided within each inlet opening 31, 32, 33. This flow control structure will be further described below. Figure 2 To elaborate further, a steering wall 51, 52, and 53 are provided on the inner side. Each steering wall 51, 52, and 53 extends downward from the upper side of the housing 20 to the bottom (not described) of the working medium container and is sealed downward at the corresponding location.

[0049] In the illustrated embodiment, the working medium in the working medium container enters through each inlet opening 31, 32, 33. The working medium then passes through the corresponding flow control structures 41, 42, 43 and arrives at a continuously narrowing channel between the housing 20 and the corresponding turning walls 51, 52, 53. Finally, the working medium reaches towards the center of the housing 20. There is a connector 60 located in the upper side 21 of the housing 20. The connector 60 is currently configured as a hole into which a line can be inserted, thus generating a negative pressure by applying a corresponding negative pressure within the suction chamber 10, which draws the working medium in the suction chamber 10 upwards. Therefore, at the location where the suction chamber 10 is present, the working medium can be drawn in a particularly advantageous manner.

[0050] Recesses 81, 82, and 83 are provided directly inside each of the inlet openings 31, 32, and 33. These recesses are formed by corresponding protrusions 91, 92, and 93 that extend from adjacent sections of the housing 20 toward the respective inlet openings 31, 32, and 33. Therefore, when the working medium flows in, a vortex is formed inside the respective inlet openings 31, 32, and 33, thus generating a suction effect that draws in other working media.

[0051] Therefore, particularly at very low material levels, excellent suction of the working medium can be achieved, at which point only a small amount of wave motion is still moving through the working medium container due to sloshing motion. The working medium can enter through one of the inlet openings 31, 32, 33 and form a vortex. The working medium can be suctioned, but also partially exited through the other inlet openings 31, 32, 33, thus preventing blockage in the suction chamber 10 and maintaining the vortex effect.

[0052] The suction chamber 10 is completely closed on the upper side outside the connector 60. The described function of suction and flow of the working medium, along with the formation of eddies, can be advantageously formed and not compromised in that the working medium exits on the upper side 21.

[0053] Figure 2 The suction chamber 10 is shown schematically in a bottom view. References are shown here. Figure 1 The components are illustrated. Arrows are also drawn to show the typical flow pattern as the working medium enters.

[0054] Additional Figure 2 The first flow control structure 41 is described in more detail below. The first flow control structure 41 has a plurality of first flow resistance elements 45 and a plurality of second flow resistance elements 46 arranged along a line that extends slightly obliquely to the direction of extension of the first inlet opening 31. Here, the first flow resistance elements 45 have a cross-section that tapers in the outflow direction—that is, opposite to the drawn arrow. They are configured in the current arrow shape. The second flow resistance elements 46 are configured in a teardrop shape in cross-section, wherein the corresponding tips point towards the interior of the housing 20.

[0055] In this implementation, the entry of the working medium is almost unimpeded, but the exit of the working medium is significantly and more strongly impeded. This is particularly due to the combination of the tapered cross-section of the first flow resistance element 45 and the cleverly arranged teardrop shape of the second flow resistance element 46. Therefore, it is possible to prevent a significant portion of the working medium already in the suction chamber 10 from being jolted out, for example, when the accelerating force is applied.

[0056] As in Figure 2 As can be seen, each of the entry openings 31, 32, and 33 is arranged with the same angular relationship relative to each other. They are rotationally symmetrical with reference to a 120-degree angle. This corresponds to an implementation with three entry openings. It should be noted that other numbers of entry openings and other angular relationships may also be used.

[0057] Figure 3This illustrates a suction chamber 10 according to another embodiment. Here, in addition to the aforementioned connector 60, there is another connector 65, which is disposed directly adjacent to the first connector. This allows for the placement of a module within the suction chamber 10 that actively generates negative pressure. Further details will be provided below. Figure 7 Let's discuss this in more detail.

[0058] Figure 4 This shows a suction chamber 10 according to another embodiment. Different from... Figure 2 In this implementation method, the flow control structures 41, 42, and 43 do not constitute a reference. Figure 2 Instead of the described structure, it is configured as interrupted walls that extend along a line. Additionally, a fourth inlet opening 34 is present along with a fourth flow control structure 44 and a fourth deflection wall 54. Therefore, the working medium can enter at even more locations, where radial symmetry is also visible, exhibiting a 90° radial symmetry. Correspondingly, other embodiments are also possible.

[0059] In this and other embodiments, the side recesses are configured to be smaller, and therefore these side recesses will not be discussed separately.

[0060] Figure 5 This shows the suction chamber 10 according to another embodiment. Different from... Figure 2 In this implementation, the flow control structures 41, 42, and 43 are similar to those in... Figure 4 The wall is constructed as an interrupted straight line, similar to the implementation method. See also for other aspects. Figure 2 Explanation.

[0061] Figure 6 This illustrates a suction chamber 10 according to another embodiment. Figure 5 In a variation of the implementation, there are only two inlet openings 31, 32, along with associated flow control structures 41, 42 and steering walls 51, 52. Here, radial symmetry is configured at an angle of 180°.

[0062] Figure 7 Simply illustrating a module 70, which, for example, can be... Figure 3 This module 70 is used in an embodiment to generate negative pressure within the suction chamber 10. The module 70 has an inlet 72, which can be connected, for example, to the additional connector 65. The inlet 72 is directed to a drive nozzle 74, which is directed towards a mixing chamber 76. The mixing chamber 76 is then directed to an outlet 78, which can be connected, in particular, to the connector 60.

[0063] If a driving jet is thus supplied through the additional connector 65, this driving jet generates a very rapid flow that exits from the driving nozzle 74. A negative pressure is generated in the mixing chamber 76. The mixing chamber 76 is open outwards, i.e., towards the interior of the housing 20, and thus ensures that the negative pressure operates within the suction chamber 10. Therefore, the working medium can be drawn in and can exit from the outlet 78 into the connector 60 along with the returning driving jet, from where it can be reused.

[0064] The module 70 can be configured independently of the suction chamber 10, so that the module can be inserted when needed, but can also be replaced separately.

[0065] For readability reasons, the phrase "at least one" is partially omitted for simplicity. If the features of the technology disclosed herein are described in a singular or indefinite number (e.g., the opening / an opening, the mixing chamber / a mixing chamber, etc.), a majority of them (e.g., the at least one opening, the at least one mixing chamber, etc.) should also be disclosed.

[0066] The foregoing description of this invention is for illustrative purposes only and is not intended to limit the invention. Various changes and modifications are possible within the scope of this invention without departing from the scope of the invention and its equivalents.

[0067] List of reference numerals

[0068] 10 suction chambers

[0069] 20 housing

[0070] 21 upper side

[0071] 22 lower side

[0072] 31, 32, 33, 34 Enter the opening

[0073] 41, 42, 43, 44 Flow control structures

[0074] 45, 46 Flow resistance elements

[0075] 51, 52, 53, 54 Turning walls

[0076] 60 connector

[0077] 65 Other connectors

[0078] 70 modules

[0079] 72 entrances

[0080] 74 Drive Nozzle

[0081] 76 Mixing Chambers

[0082] 78 Exports

[0083] 81, 82, 83 Lateral concave portions

[0084] 91, 92, 93 protrusions

Claims

1. A suction chamber (10) for a working medium pump, said working medium pump being used to suction working medium stored in a working medium container of a motor vehicle, The suction chamber includes: The housing (20) has a lower side (22) configured to rest against the bottom of the working medium container, and at least one connector (60) is formed in the upper side (21) of the housing for wiring of the working medium pump. At least one first entry opening (31) and a second entry opening (32) are formed on the side of the housing (20) for allowing the working medium to enter the connector (60). A turning wall (51, 52, 53, 54) is provided in the housing (20) between each access opening (31, 32, 33, 34) and each joint (60), and A side recess (81, 82) is formed inside at least one entry opening (31, 32).

2. The suction chamber (10) according to claim 1, wherein, Side recesses (81, 82, 83) are formed on the inside of some of the entry openings (31, 32, 33) or all of them.

3. The suction chamber (10) according to claim 1, wherein, One, some, or all of the side recesses (81, 82, 83) are formed by protrusions (91, 92, 93) in the housing (20), which directly abut the openings (31, 32, 33).

4. The suction chamber (10) according to claim 3, wherein, One protrusion (91, 92, 93), some or all of the protrusions (91, 92, 93) are aligned in a plane with the entry opening (31, 32, 33).

5. The suction chamber (10) according to claim 3 or 4, wherein, One protrusion (91, 92, 93), some or all of the protrusions (91, 92, 93) form an angle of at least 45° and / or a maximum of 90° with the directly adjacent section of the shell (20).

6. The suction chamber (10) according to any one of claims 1 to 4, wherein, At least one third access opening (33) is formed on the side of the housing (20) for allowing the working medium to enter the connector (60).

7. The suction chamber (10) according to claim 6, wherein, At least one fourth access opening (34) is formed on the side of the housing (20) for allowing the working medium to enter the connector (60).

8. The suction chamber (10) according to any one of claims 1 to 4, wherein, Each entry opening (31, 32, 33, 34) is elongated on multiple side surfaces of the shell (20).

9. The suction chamber (10) according to any one of claims 1 to 4, wherein, Each entrance opening (31, 32, 33, 34) has the same angular spacing as its corresponding circumferentially adjacent entrance opening (31, 32, 33, 34).

10. The suction chamber (10) according to any one of claims 1 to 4, wherein, The entry openings (31, 32, 33, 34) and / or the turning wall are unchanged compared to the entry openings and / or the turning walls rotated by a certain angle, where the angle is 360° divided by the number of entry openings (31, 32, 33, 34) or an integer multiple of that quotient.

11. The suction chamber (10) according to any one of claims 1 to 4, wherein, The turning walls (51, 52, 53, 54) of the housing (20) form corresponding channels from the entry openings (31, 32, 33, 34) toward the joint (60), and the channels have a cross-section that decreases toward the joint (60) at least along one section.

12. The suction chamber (10) according to any one of claims 1 to 4, wherein, An additional connector (65) is formed in the upper side (21) of the housing (20), the additional connector being disposed directly adjacent to the connector (60).

13. The suction chamber (10) according to claim 12, wherein, A drive nozzle (74) and a mixing chamber (76) are provided in the housing (20). The drive nozzle (74) is aligned with the mixing chamber (76) and connected to the additional connector (65) on the input side. The mixing chamber (76) is connected to the connector (60) on the output side and has an opening leading to the interior of the housing (20).

14. The suction chamber (10) according to claim 13, wherein, The drive nozzle (74) and the mixing chamber (76) are housed in a module (70) that can be removed from the housing (20).

15. The suction chamber (10) according to any one of claims 1 to 4, wherein, Flow control structures (41, 42, 43, 44) are provided outside the corresponding turning walls (51, 52, 53, 54) on the entry openings (31, 32, 33, 34), and the flow control structures extend along a corresponding line.

16. The suction chamber (10) according to claim 15, wherein, The flow control structure (41, 42, 43, 44) has multiple first flow resistance elements (45) and multiple second flow resistance elements (46), which are alternately arranged along corresponding lines. The first flow resistance elements (45) are tapered in the outflow direction, and the second flow resistance elements (46) are teardrop-shaped in cross-section, with the tip of the teardrop pointing towards the interior of the housing (20); or The flow control structures (41, 42, 43, 44) are configured as interrupted walls extending along the corresponding lines.

17. The suction chamber (10) according to any one of claims 1 to 4, wherein, The connector (60) is configured as an opening for a line to pass through.

18. The suction chamber (10) according to claim 12, wherein, The additional connector (65) is configured as an opening for the passage of a line.

19. The suction chamber (10) according to any one of claims 1 to 4, wherein, The connector (60) is configured as a line extending into the housing (20).

20. The suction chamber (10) according to claim 12, wherein, The additional connector (65) is configured as a line extending into the housing (20).

21. The suction chamber (10) according to any one of claims 1 to 4, wherein, The lower side (22) of the housing (20) is in a plane.

22. The suction chamber (10) according to any one of claims 1 to 4, wherein, The suction chamber (10) is completely closed on the upper side (21) outside the connector (60).

23. The suction chamber (10) according to claim 12, wherein, The suction chamber (10) is completely closed on the upper side (21) outside the connector (60) and the other connector (65).

24. A suction jet pump or working medium pump, comprising: At least one electric pump unit and at least one suction chamber (10) according to any one of claims 1 to 23, wherein the connector (60) of the suction chamber (10) is connected to the pump unit in a flow-directing manner.

25. The suction jet pump or working medium pump according to claim 24, wherein, The suction chamber is the suction chamber according to claim 12, wherein the additional connector (65) of the suction chamber (10) is connected to the pump unit in a flow-directing manner.

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