Fluid-fillable bladder system

Abstract

The invention relates to a fluid-fillable bladder system (1), in particular for components of a vehicle that have an adjustable contour, comprising at least one bladder (2) having a bladder interior (4), a sleeve (3) and an inlet (5), wherein the sleeve is formed from a first diaphragm (6) and a second diaphragm (7), wherein the first diaphragm and the second diaphragm are connected to each other along an edge contour (8), wherein the sleeve cannot vibrate as readily in a first region (9), in particular which is close to the edge contour, than in a second region (10), in particular which is remote from the edge contour, wherein the inlet of the bladder further comprises a fluid-guiding means (11) having a fluid-guiding means outlet (12) in the bladder interior, wherein the fluid leaves the fluid-guiding means outlet in a direction R1, wherein the direction R1 extends through the first region within the bladder interior.

Description

[0001] Fluid-fillable bladder system

[0002] The present invention relates to a fluid-fillable bladder system.

[0003] Fluid-fillable bladders and multi-chamber bladder systems are frequently used in the automotive sector and typically comprise air-fillable film bladders or air chambers. These flexible film bladders are filled using a compressed air supply, for example, with the air pressure being variably adjustable to create support contours of varying hardness and strength in a vehicle seat, for example.

[0004] Multi-chamber bladder systems typically have a compressed air supply leading into one of the bladders, with the other bladders connected to overflow channels and thus also supplied with compressed air. US 4,965,899, US 6,122,784, and DE 10 2011 089 749 B4 disclose various types of multi-chamber bladder systems, in which the individual chambers are interconnected, allowing air to flow between adjacent bladders.

[0005] Known multi-chamber bladder systems often exhibit unfavorable behavior when filled with compressed air, especially when external pressure, for example, due to the body weight of a person sitting in a vehicle seat, is exerted on the bladder system at the same time. DE 10 2019 214 576 A1 discloses connecting the interior spaces of two adjacent bladders via a fluid channel, allowing fluid to flow over them. A contour zone surrounding the fluid channel is formed, facing into the interior of at least one of the bladders and comprising two or more regions of different material thicknesses of the film forming the bladder.

[0006] Furthermore, it is known that noise can occur when filling or emptying a fluid-fillable bladder system. DE 10 2021 106 361 A1 discloses optimizing the contour of a hose at its end so that the flow is directed into the bladder with little or no turbulence.

[0007] DE 10 2012 211 392 A1 discloses an actuator for a vehicle seat. This actuator has a bladder that can be filled with a pressurized medium and consists of at least a first and a second film that are connected to each other along a connecting seam to form a bladder chamber. Furthermore, the document discloses an inlet line for the bladder chamber, which introduces the pressurized medium, e.g., air, particularly off-center, into the bladder. The inlet line can have an angled end section.

[0008] It is the object of the present invention to provide a fluid-fillable bladder system which enables a fluid to flow into or out of the bladder with as little noise as possible.

[0009] The problem is solved by the subject matter of claim 1. Useful embodiments emerge from the respective subclaims.

[0010] The fluid-fillable bladder system according to the invention, in particular for contour-adjustable components of a vehicle, comprises at least one bladder with a bladder interior, a shell, and an inlet, wherein the shell is formed from a first membrane and a second membrane, wherein the first membrane and the second membrane are connected to one another along an edge contour, wherein the shell has a lower vibration capability in a first region, in particular close to the edge contour, than in a second region, in particular remote from the edge contour, wherein the inlet of the bladder further comprises a fluid guide means with a fluid guide means outlet in the bladder interior, wherein the fluid leaves the fluid guide means outlet in a direction R1, wherein the direction R1 extends within the bladder interior through the first region. Expediently, the direction R1 extends from the fluid guide means outlet to the edge contour exclusively through the first region.

[0011] The design according to the invention is particularly suitable for reducing noise generation when subjected to cyclic air blasts, in particular for avoiding resonance phenomena.

[0012] The bladder according to the invention has at least one chamber. Fluid, in particular air, in particular compressed air, can enter the bladder through the inlet and exit the bladder through the inlet or an outlet arranged separately from the inlet. The bladder can be filled via the inlet. In an empty state, the first membrane and the second membrane can be in contact with each other, while in a filled state, they are connected to each other along the edge contour and are spaced apart from each other at least in certain regions.

[0013] The shell has at least one region with low vibration capability and one region with higher vibration capability. The vibration capability of the shell is determined by the vibration capability of each membrane. Fixed and / or reinforced and / or doubled and / or welded regions of a membrane have lower vibration capability than regions that extend freely, particularly with a uniform membrane thickness. An oscillation frequency can be influenced, in particular, by the excitable area and the membrane thickness.

[0014] The membrane expediently has a thickness of 0.1 mm to 0.5 mm in the first region and / or a Shore hardness of 60 to 100. In one embodiment, the edge contour, e.g. an edge contour designed as a weld seam, and / or a further weld seam can be designed with curves or corners in order to further reduce the vibration capability in the vicinity of this edge contour or further weld seam. In particular, the weld seam can consist predominantly, substantially, for example at least 80%, or entirely of curved or bent sections, wherein the curvature or bend of the curved or bent sections runs in the membrane surface in a deflated state of the bladder, in which the membranes each extend in one plane. A curved weld seam likewise reduces the vibration capability of the membrane in the vicinity of the curved weld seam.

[0015] The bladder has a fluid guide means with a fluid guide outlet arranged in the bladder interior, which allows the incoming fluid to be introduced into the bladder interior in a specific direction R1. The direction R1 is the main flow direction of the fluid at the fluid guide outlet. According to the invention, the fluid is introduced into the bladder such that the direction R1 is aligned such that the shell of the bladder is only slightly excited to vibrate. This means that the direction R1 is selected such that the fluid is introduced into or through the first region with low vibration capacity. Due to the introduction according to the invention, the shell is less excited to vibrate and less noise is generated. The direction R1 is selected in particular such that the main flow is not directed towards a central region of the membrane, in particular the center of the membrane, but eccentrically if this region has a second region, i.e.with higher vibration capability.

[0016] Preferably, the direction R1 is selected such that the fluid flows along the edge contour at least in sections, particularly near the fluid guide outlet. The edge contour reduces the oscillation capability of the membrane in an adjacent region, so that a first region is formed along the edge contour.

[0017] The edge contour can be circular. Alternatively, the edge contour can be designed with multiple corners, in particular rounded corners, e.g. four, five or more corners. The sections between the corners can be straight or curved towards the interior of the bubble. Furthermore, the sections between the corners can have multiple adjacent regions curved towards the interior of the bubble. In the last two cases, it can be expedient for the direction R1 to run tangentially or almost tangentially to this edge contour and for the fluid flow to flow along this edge contour in one section. Almost tangential is understood to mean a deviation of less than 15°, in particular less than 10°, in particular less than 5°.

[0018] In one embodiment, the edge contour extends in a ring around a common center point of the first membrane and the second membrane. The edge contour thus has a circumferential direction tangential to the edge contour. A straight line extending in the direction R1 has a first and a second intersection point with the edge contour. An angle cd between the straight line at the first intersection point with the circumferential direction is expediently between 0° and 60°, in particular between 0° and 40°, in particular between 0° and 20°. In other words, the direction R1 does not run radially but at an angle ß to the radial direction. The fluid flowing out through the fluid guide outlet can thus flow through an outer first region in the bladder interior. Alternatively, the fluid guide outlet can also be designed such that the fluid guide outlet is opposite a section of the edge contour and the fluid flows towards the edge contour.

[0019] Alternatively, the edge contour extends around a common center point or centroid of the first membrane and the second membrane, wherein the edge contour has at least three corners. The fluid guide means is aligned such that a straight line extending in R1 intersects a first corner of the at least three corners. This means that a first edge contour section and a second edge contour section extend from the first corner at an angle y. The angle y can be, for example, 90° for an edge contour with four corners. The direction R1 has an angle a2 with an extension direction or circumferential direction of the first edge contour section, wherein the angle a2 is less than 0.45*y, in particular less than y / 3. This means that according to the invention, the direction R1 is not the bisector of the angle y. The angle a2 is, in particular, a few degrees, e.g.<10°, in particular <20° or <30°, for example 25°±5°, so that the fluid flowing out of the fluid guide outlet flows along the first section.

[0020] Further alternatively, the edge contour extends around a common center point or centroid of the first membrane and the second membrane, wherein the edge contour has at least three corners, wherein a first of the three corners has a first edge contour section and a second edge contour section as legs. In deviation from the previous exemplary embodiment, the fluid guide means is oriented such that a straight line extending in R1 intersects the first leg and the second leg, wherein a first edge contour section and a second edge contour section extend at an angle from the first corner. I.e. in an example of a rectangular edge contour, the fluid guide means and its outlet are oriented such that the flow flows from one side edge into the interior of the bubble and onto an adjacent side edge.

[0021] In particular, the direction R1 forms an angle a3 with an extension direction or circumferential direction of the first edge contour section, wherein the angle a3 lies between 0° and 80°, in particular between 0° and 60°, in particular between 0° and 40°, in particular between 0° and 20°, wherein both intersection points with the straight line therebetween are located in the first region.

[0022] In an alternative embodiment, the fluid guiding means is designed such that the direction R1 runs perpendicular but eccentrically to a first edge contour section. Expediently, the flow of the fluid in a region close to the edge in the first region runs parallel to a second edge contour section. In one embodiment, the fluid guiding means comprises a line which is connected to the bladder such that an internal volume of the line is in fluid communication with the bladder interior, that an external wall of the line is connected to the shell, and that the line extends with an end section into the bladder interior and forms a fluid guiding means outlet. An end section of the line has the extension direction in the direction R1. In particular, the line, together with the end section of the line, forms the inlet for the fluid into the bladder.The end section forming the inlet for the fluid is expediently spaced from the edge contour, in particular a weld seam designed as an edge contour, by a minimum distance, which can in particular be in the range of > 1 cm, in particular > 2 cm, alternatively the minimum distance can be greater than a diameter of the line designed as a fluid guide means, further alternatively the minimum distance can be at least 5%, in particular at least 10% of a maximum bubble diameter in an emptied state.

[0023] In one embodiment, the line is welded to the bladder. Alternatively or additionally, the line is designed as a hose or tube. In particular, the hose or line is provided with an inner wall and an outer wall, which enables a low-turbulence outflow of the fluid, in particular by connecting the outer and inner walls via a contour without a separation edge, in particular via a continuous curve.

[0024] In one embodiment, the edge contour is formed completely or in sections by a weld seam. The weld seam expediently has non-linear, in particular curved sections. The curved sections expediently form one or more arches which, when the bladder is unfilled, lie in the membrane plane. In one embodiment, the curved sections comprise at least 50%, in particular at least 90%, in particular 100% of the sections forming the weld seam. This means that the weld seam can in particular be formed from one or more arches by which the first and second membranes of the shell are connected to one another. A curved weld seam serves the particular purpose of preventing any spontaneous or sudden change in shape of the bladder when filling the bladder, e.g. due to kinking or wrinkling in the bladder or a partial area of ​​the bladder due to unstable conditions.A spontaneous change in the shape of an air-filled body generally results in noise, which should be avoided. By preventing spontaneous changes in shape and avoiding kinks or folds, noise can be further reduced.

[0025] In a further embodiment, the fluid guiding means comprises baffles or structures.

[0026] In one embodiment, the shell has a welded structure, in particular a rotationally symmetrical welded structure. The welded structure is arranged, in particular, away from the edge contour. The welded structure is expediently different from the edge contour formed by a weld seam.

[0027] Such a welding structure is particularly characterized by the presence of bulges in the film, which are formed by welding beads.

[0028] In one embodiment, the welded structure is formed in a third, particularly central, region of at least one of the membranes. The welded structure can connect two or more membranes to one another. In particular, the direction R1 is selected such that it does not intersect the third region.

[0029] In one embodiment, the bladder comprises at least a first chamber with a first shell and a second chamber with a second shell connected to the first chamber via a through-opening. A welded structure is arranged around the through-opening such that the first shell is connected to the second shell and fluid can flow from the inlet through the first chamber into the second chamber via the through-opening.

[0030] The bladder expediently comprises at least a first chamber and a second chamber connected to the first chamber via a through-opening, each chamber of the bladder having a circumferential weld seam.

[0031] In one embodiment, the welded structure forms channels that facilitate, in particular, the filling of an empty chamber through the through-opening. Thus, the welded structure can be formed by a plurality of individual welds or weld points. The bladder system can comprise several bladders, each bladder connected to a line as described above. The bladder system can be designed, in particular, for lumbar support, lateral support, or a massage function in a seat.

[0032] The seat according to the invention, in particular a vehicle seat, comprises a bladder system as described above.

[0033] The vehicle according to the invention comprises a bladder system as described above.

[0034] The invention will be explained in more detail below with regard to further features and advantages based on the description of exemplary embodiments and with reference to the accompanying drawings. Each of these drawings shows a schematic diagram:

[0035] Fig. 1a, b Design of a bubble system with square bubble in top view and side view,

[0036] Fig. 2 further design of a bubble system with square bubble,

[0037] Fig. 3 further design of a bubble system with square bubble,

[0038] Fig. 4 Design of a bladder system with a round bladder,

[0039] Fig. 5 Design of a bladder system with a central welding structure,

[0040] Fig. 6 further design of a bladder system with a central welding structure,

[0041] Fig. 7 Schematic sectional view of a bladder system with one chamber,

[0042] Fig. 8 Sectional view of the tube entering the bladder,

[0043] Fig. 9a, b Sectional view of various bladder systems with two chambers, and

[0044] Fig. 10 shows a further embodiment of a bladder system with a central welded structure. Fig. 1a shows a plan view of a bladder system 1 in a first embodiment. The bladder 2 has a rectangular or square base area. In an edge region, a fluid guide means 11 designed as a line 13 extends into the shell 3 of the bladder 2. The line 13 is arranged here in a corner 50. The corner 50 is a rounded corner with an angle y of 90°. An end section 14 of the line 13 is arranged as a fluid guide means outlet 12 in the interior of the bladder. The line 13 has an extension direction in the direction R1 in its end section 14. The line 13 is connected, in particular welded, to the shell 3 of the bladder 2 in a connecting section 18, so that the line 13 forms the inlet 5 into the shell 3.

[0045] The bladder 2 has an edge contour 8 that surrounds a bladder interior 4. The edge contour 8 can be formed, in particular, by a circumferential weld seam 24. A first membrane 6 is connected to a second membrane 7 at the edge contour 8. The first and second membranes 6, 7 lie on top of one another in an empty state, and in an at least partially filled state, the membranes 6 and 7 move away from one another, as shown in Fig. 1b, the line not being shown in Fig. 1b for the sake of clarity.

[0046] The bladder further comprises a first region 9 and a second region 10.

[0047] The first region 9 is a region in which the membranes exhibit a lower vibration capacity than in the second region. The extent of these regions depends, among other things, on the membrane thickness and the shape of the edge contour, etc. The dashed transition between the first and second regions is purely schematic and can, for example, be located closer to the edge contour 8.

[0048] A fluid introduced into the bladder is guided by the fluid guide means, here the line 13, in a first direction R1 into an interior of the bladder 2. This direction R1 is eccentrically aligned. In the embodiment shown, the direction R1 forms an angle α2 to a first edge contour section 40, so that the main flow of the incoming fluid is located substantially, in particular exclusively, in the first region. Thus, the second region 10, which has a higher vibration capacity, is not directly excited, which leads to effective noise reduction when filling the bladder. A connecting line R2 from the corner 50 to the center point M, which here is also the area's centroid, forms an angle β with the direction R1, where β>α2 is expedient. The bladder can optionally have a third region 16, which, for example, has a welded structure or inward-directed projections.

[0049] Fig. 2 shows a further embodiment of a bladder system 1. In this embodiment, the line 13 enters the bladder 2 perpendicularly through a first edge contour section 40. The end section 14 of the line 13 is oriented such that the direction R1 runs parallel to the second edge contour section 41. The first and second edge contour sections can also be interchanged. In this embodiment, too, the main flow in the first region 9 runs with low oscillation potential.

[0050] Fig. 3 shows a further embodiment of a bladder system 1. In this embodiment, the line 13 enters the bladder 2 at an angle through a first edge contour section 40. In this embodiment, the direction R1 is directed toward the second edge contour section 41 and forms an angle a3 with the first edge contour section 40.

[0051] Fig. 4 shows a further embodiment of the bladder system. Unlike the preceding bladder systems, this bladder system 1 has a rounded edge contour 8. Furthermore, this bladder system comprises a fluid guide 11, which in this embodiment, in addition to the line 13, also comprises a further fluid guide 11 in the form of a baffle in the bladder, which can be implemented, for example, by a further weld seam. The fluid is directed by the baffle in a direction parallel to the edge contour, so that at the outlet of the fluid guide 11, the edge contour 8 and the direction R1 form an angle a1 of 0°, i.e., they are parallel.

[0052] Fig. 5 shows a further embodiment of the bladder system 1. The shell 3 of the bladder 2 here has at least two chambers which are connected to one another via a through-opening 22. A welded structure 20 is formed around the through-opening 22 in a third region 16. The third region 16 is formed here as a welded structure 20 on all or at least some of the film layers or membranes lying one above the other in plan view. The welded structure can comprise a further weld seam for connecting the shells to one another, which is formed around the through-opening 22. The welded structure expediently forms elevations and depressions so that fluid channels are formed between certain regions of the membranes lying one above the other in the deflated state, which fluid channels enable improved fluid flow to a through-opening 22 which connects two or more bladder chambers lying one behind the other in the viewing direction.The elevations are, for example, the weld points 30. Furthermore, Fig. 5 shows a circumferential weld seam 24 which outwardly delimits and thus closes a chamber of the bladder formed from two membranes. The line 13, which can be designed as a hose, is expediently also connected to the bladder by the weld seam 24, so that an outer wall of the line is connected to the shell 3 of the bladder. The first edge contour section 40 is curved here. In this embodiment, an angle is determined between the direction R1 and the edge contour section to a direction of extension of the edge contour section 40, i.e. the tangent of the edge contour section. This angle is expediently in the range from 0° to approximately 20°.

[0053] The curvature of the first edge contour section also has a stabilizing effect on the shape of the bladder when filled or during the filling process, so that kinks in the area of ​​the weld seam or in the membrane are largely or completely avoided.

[0054] In Fig. 5, a connecting line R2 from the corner 50 to the center point M is also shown, which represents an angle bisector of the corner angle y, as well as a tangent T of the third region 16 with the weld structure 20 to the corner 50. The size of the angle a2 is selected according to the invention such that the direction R1 runs in a sector which is limited by the direction of the tangent as the maximum angle a2 and to avoid a direct flow to the through-opening 22 and thus a high vibration excitation of the chamber connected by the through-opening 22.

[0055] Fig. 6 shows an alternative embodiment of the bladder system with a bladder with a round base and a round edge contour 8. The bladder 2 also has a further weld structure 20 in a third region 16, which is arranged centrally in the bladder. R2 extends radially. The direction R1 of the fluid flow extends at an angle α1 to the direction of extension UR of the edge contour 8. As shown here, the angle α1 is expediently smaller than an angle β between R2 and R1, but at least selected such that the angle α1 is smaller than or equal to an angle between the shown tangent T and the direction of extension UR.

[0056] Fig. 7 shows a sectional view according to AA' in Fig. 1a with a bladder with one chamber, with an eccentrically arranged line 13. The line opens with its end section 14 into the bladder interior 4 of the bladder 2 delimited by the membranes 6 and 7 and the weld seam 24 and extends at a small angle to the edge contour 8.

[0057] Fig. 8 shows a sectional view of a bladder chamber in the region of the entry of the line 13 into the bladder 2. The line 13 has an outer wall 13a and an inner wall 13b. The shell 3 of the bladder is connected to the outer wall 13a with the shell 3, in particular to a first and a second film layer or membrane in the connecting section 18, in particular by welding. The end section 14 of the line 12 is located in a bladder interior 4. In the end section 14, the outer wall 13a and the inner wall 13b can run parallel, so that the hose or line looks as if it has been straight cut off (not shown), or the inner wall 13b can be provided with a contour so that the line has an increasing inner diameter with a constant outer diameter in an end region.In particular, the end section 14 in the illustrated embodiment has no sharp edges, which leads to a further reduction of the noise during filling and / or emptying, as also described in the applicant's application DE 102021 106 361 A1.

[0058] Fig. 9a and b schematically show two cross-sections of bladders with two chambers. In Fig. 9a, the line 13 opens into the first, here lower, chamber 26. The first chamber 26 is fluidically connected to the second, here upper, chamber 28 via a through-opening 22. A welded structure 20 is provided around the through-opening 22, which can be designed, for example, as shown in plan view in Fig. 5, and which connects the shells 3a, 3b of the first and second chambers 26, 28 to one another. The enlarged detail in Fig. 9c shows that the welded structure has a further weld seam 31 which runs circumferentially around the through-opening and connects the two shells 3a, 3b to one another in a fluid-tight manner. A lower film layer or membrane of the first chamber is likewise connected to the welded structure 20 here.However, this is only connected to one another at specific points or over small areas by means of welds 30, such that fluid channels are formed between the welds 30. Furthermore, at least some of the welds 30 can form projections on the side projecting into the second shell 3b, in order to ensure easier filling of the chamber 28. The weld structure 20 and the through-opening 22 form the third region 16. The line 13 is oriented such that the main flow direction, which approximately corresponds to the extension direction R1, does not flow towards the center point and thus directly onto the weld structure 20 and the through-opening 22, but is oriented at an angle α to an edge contour 8 of the bladder 2, such that the main flow direction extends through a first region 9 of the bladder.

[0059] Fig. 9b shows a modification of the embodiment shown in Fig. 9a. The bladder here consists of four layers of film or four membranes, wherein the film layers that form a chamber are each connected by a circumferential weld seam 24 and the middle film layers provided with a through-opening 22 are provided with a weld structure 20 surrounding the through-opening, which forms the transition between the chambers in such a way that no fluid can escape from the bladder interior 4. For this purpose, as shown schematically in the enlarged detail 9b, a further weld seam 31 is provided circumferentially around the through-opening 22. At the same time, a channel structure is formed with the help of the weld points 30, through which inflowing fluid from the first chamber can flow into the second chamber even when the second chamber is still empty, i.e. when the film layers lie flat on top of one another.The welds 30 can alternatively be replaced by other projections, which are produced, for example, by embossing or material thickening. In this embodiment, the line 13 is also oriented such that the main flow direction, which approximately corresponds to the extension direction R1, does not flow toward the center point and thus directly toward the weld structure 20 and the through-opening 22, but rather is aligned at an angle α to an edge contour 8 of the bubble 2, so that the main flow direction extends through a first region 9 of the bubble.

[0060] Fig. 10 shows an alternative embodiment of the bladder system shown in Fig. 5. This embodiment differs from the embodiment shown in Fig. 5 in the weld seam that connects the membranes to each other. Here, the weld seam has several curved or arcuate sections. In the embodiment shown, the weld seam has no linear sections. These multiple arcuate sections serve to prevent wrinkling and, in particular, sudden changes in the shape of the bladder during the filling process.

[0061] The curved sections, marked here with 40a, 40b, and 40c, can be designed identically or differently. For example, sections 40a and 40c can be shorter and / or protrude less toward the center of the bladder than a central region 40b, and additionally contribute to stabilizing the bladder and reducing noise. Figure 10 shows an optional central weld structure 20.

[0062] The features described here in the various examples can also be combined in other ways by the person skilled in the art.

[0063] Reference symbol:

[0064] 1 Bladder system

[0065] 2 Bladder

[0066] 3 Cover

[0067] 3a first shell

[0068] 3b second shell

[0069] 4 Bladder interior

[0070] 5 Entrance

[0071] 6 Membran

[0072] 7 Membran

[0073] 8 Edge contour

[0074] 9 first area

[0075] 10 second area

[0076] 11 Fluid conveying means

[0077] 12 Fluid guide outlet

[0078] 13 Management

[0079] 13a exterior wall

[0080] 13b interior wall

[0081] 14 Final section

[0082] 16 third area

[0083] 18 connecting section

[0084] 20 Weld structure

[0085] 22 through holes

[0086] 24 Weld seam

[0087] 26 first chamber

[0088] 28 second chamber

[0089] 30 welding point

[0090] 31 additional welds

[0091] 40 first edge contour section

[0092] 41 second edge contour section

[0093] 50 corner

[0094] R1 Extension direction

[0095] R2 connecting line

[0096] T Tangent

[0097] M center

Claims

Patent claims 1. A fluid-fillable bladder system (1), in particular for contour-adjustable components of a vehicle, comprising at least one bladder (2) with a bladder interior (4), a shell (3), and an inlet (5), wherein the shell (3) is formed from a first membrane (6) and a second membrane (7), wherein the first membrane (6) and the second membrane (7) are connected to one another along an edge contour (8), wherein the shell (3) has a lower vibration capability in a first region (9), in particular close to the edge contour, than in a second region (10), in particular remote from the edge contour, wherein the inlet (5) of the bladder (2) further comprises a fluid guide means (11) with a fluid guide means outlet (12) in the bladder interior (4), wherein the fluid leaves the fluid guide means outlet (12) in a direction R1, wherein the direction R1 extends within the bladder interior (4), in particular exclusively, through the first region (9).

2. Bladder system (1) according to claim 1, wherein the fluid flows at least partially along the edge contour (8), in particular wherein the fluid flows at least partially along a tangent of a partially inwardly curved edge contour (8).

3. Bladder system (1) according to claim 1 or 2, wherein the edge contour (8) extends in a ring around a common center point (M) of the first membrane (6) and the second membrane (7), wherein the edge contour (8) has a circumferential direction (UR) tangential to the edge contour, so that a straight line extending in the R1 direction has a first and a second intersection point with the edge contour, wherein an angle cd at the first intersection point lies between 0° and 80°, in particular between 0° and 60°, in particular between 0° and 40°, in particular between 0° and 20°.

4. Bladder system (1) according to claim 1 or 2, wherein the edge contour (8) extends around a common center point (M) of the first membrane (6) and the second membrane (7) or common center of gravity the first membrane (6) and the second membrane (7), wherein the edge contour (8) has at least three corners, wherein the fluid guiding means (11) is aligned such that a straight line extending in R1 intersects a first corner (50) of the at least three corners and wherein a first edge contour section (40) and a second edge contour section (41) extend from the first corner (50) at an angle y, and wherein the direction R1 forms an angle a2 with an extension direction or circumferential direction of the first edge contour section (40), wherein the angle a2 is less than 0.45*y, in particular less than y / 3.

5. Bladder system (1) according to claim 1 or 2, wherein the edge contour (8) extends around a common center point (M) of the first membrane (6) and the second membrane (7) or a common center of gravity of the first membrane (6) and the second membrane (7), wherein the edge contour (8) has at least three corners, wherein a first corner (50) of the three corners has a first edge contour section (40) and a second edge contour section (41) as legs, wherein the fluid guide means (11) is aligned such that a straight line extending in R1 intersects the first edge contour section (40) and the second edge contour section (41) and, in particular, wherein the direction R1 forms an angle a3 with an extension direction or circumferential direction of the first edge contour section (40), wherein the angle a3 is in particular between 0° and 80°, in particular between 0° and 60°, in particular between 0° and 40°, in particular between 0° and 20°,or wherein the fluid guide means (11) is aligned such that a straight line extending in R1 intersects the first edge contour section (40) and an opposite third edge contour section and the straight line has a smaller distance to the second edge contour section (41) than to the center point (M) of the bubble., 6. Bladder system (1) according to one of the preceding claims, wherein the fluid guiding means comprises a line (13) which is connected to the bladder (2) in such a way that an inner volume of the line (13) is in fluid communication with the bladder interior (4), that an outer wall (13a) of the line (13) is connected to the shell (3) is connected and that the line (13) extends with an end section (14) into the bladder interior (4) and forms a fluid guide outlet, wherein an end section (14) of the line (13) has the extension direction R1, wherein in particular the end section (14) of the line (13) forms the inlet (5).

7. Bladder system (1) according to claim 6, wherein the line (13) is welded to the bladder (2) and / or wherein the line (13) is designed as a hose.

8. Bladder system (1) according to one of the preceding claims, wherein the edge contour (8) is formed at least partially or completely by a weld seam (24), wherein the weld seam (24) has non-linear, in particular curved sections, optionally wherein the curved sections comprise at least 50%, in particular at least 90%, in particular 100% of the sections forming the weld seam.

9. Bladder system (1) according to one of claims 1 to 8, wherein the shell (3) has a welding structure (20), in particular a rotationally symmetrical welding structure (20).

10. Bladder system (1) according to claim 9, wherein the welding structure (20) is formed in a third, in particular central, region (16) of at least one of the membranes (6, 7).

11. Bladder system (1) according to claim 10, wherein the direction R1 is selected such that it does not intersect the third region (16).

12. Bladder system (1) according to one of the preceding claims, wherein the bladder (2) comprises at least a first chamber (26) with a first shell (3a) and a second chamber (28) connected to the first chamber (26) via a through-opening (22) with a second shell (3b), wherein a welding structure (20) is arranged around the through-opening (22) such that the first shell (3a) is connected to the second shell (3b) and fluid can flow from the inlet (5) through the first chamber (26) via the through-opening (22) into the second chamber (28).

13. Bladder system (1) according to one of the preceding claims, wherein the bladder (2) comprises at least a first chamber (26) and a second chamber (28) connected to the first chamber (26) via a through-opening (22), wherein each chamber (26, 28) of the bladder (2) has a circumferential weld seam (24).

14. Bladder system (1) according to claims 9 to 12 and optionally claim 13, wherein channels are formed by the weld structure (20), which in particular facilitate the filling of an emptied chamber through the through-opening (22).

15. Bladder system (1) according to one of the preceding claims, wherein the first and / or second membrane (6, 7) has a thickness of 0.1 mm to 0.5 mm and / or a Shore hardness in the range of 60 to 100 Shore in a first region (9).

16. Seat, in particular vehicle seat, with a bladder system (1) according to one of the preceding claims.

17. Vehicle with the bladder system (1) according to one of the preceding claims.

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