Door seal for an elevator car

Abstract

The invention relates to a door seal (8) for a lift car (3), the door seal comprising: at least one first tube (10) and one second tube (11) made of an elastically deformable sealing material; the door seal being mountable on a car wall (4) and / or door (6) of the lift car in such a way that the first and the second tube, when the door closes a door opening (5) in the car wall, are arranged opposite one another within a door gap (9) in a bridging direction (13) and run at least in part around the door opening; the first tube having a pressure connection (14) and being deformable between a starting form and an end form, which is enlarged in the bridging direction compared to the starting form, by being exposed to a fluid pressure; the second tube having at least one pressure compensation opening (16), which is designed to allow a pressure compensation between an interior and a surrounding environment of the second tube when the second tube is compressed.

Description

[0001] The present invention relates to a door seal for an elevator car. The invention further relates to a method for controlling an elevator system, a control unit, a computer program and a computer-readable medium for executing the method, as well as an elevator system.

[0002] An elevator car, for example for transporting people or goods in buildings, typically comprises a car wall with a door opening and a door for closing the opening. When the door closes the opening, it is separated from the car wall by a horizontal gap. To prevent noise or vibrations from the door while the elevator car is in motion, this gap can be bridged by means of a height-adjustable door seal. The lateral forces exerted on the door by the door seal when in operation should not be excessive.

[0003] US 5,085,293, for example, describes an inflatable door seal that, when inflated, seals a gap between the wall of an elevator shaft and the wall of an elevator car. WO 2019 171 412 A1 and JP 2005 029 332 A also show inflatable door seals with one chamber. High pressure may be necessary to inflate the seals securely. This high pressure can result in significant lateral forces on the door.

[0004] Therefore, there may be a need for an improved door seal for an elevator car that, when in operation, provides sufficient sealing of the door gap without subjecting the door to excessive lateral forces. Furthermore, there may be a need for a suitable method for controlling an elevator system, a corresponding control unit, a corresponding computer program, a corresponding computer-readable medium, and a corresponding elevator system.

[0005] These needs can be met by the subject matter of the independent claims. Advantageous embodiments are set forth in the dependent claims, the following description, and the accompanying figures.

[0006] A first aspect of the invention relates to a door seal for an elevator car, wherein the elevator car comprises a car wall with a door opening and a door for closing the door opening, the door being separated from the car wall by a door gap to be sealed when it closes the door opening. The door seal comprises at least a first tube and a second tube made of an elastically deformable sealing material. The door seal can be mounted on the car wall and / or the door such that, when the door closes the door opening, the first tube and the second tube are opposite each other within the door gap in a bridging direction in which the door seal is intended to bridge the door gap, and extend at least partially around the door opening.The first hose has a pressure port for pressurizing the first hose with fluid pressure and is deformable by changing the fluid pressure between an initial shape and an end shape that is larger in the bridging direction compared to the initial shape. The second hose has at least one pressure equalization opening designed to allow pressure equalization between the interior and the surrounding environment of the second hose when it is compressed.

[0007] The door seal allows the lateral forces acting on the door when the seal is active to be limited, ensuring that the door gap is adequately sealed while simultaneously preventing excessive stress on the door mechanism. This prevents premature wear of the door mechanism due to repeated excessive lateral stress. Furthermore, the reduced lateral stress could allow the door mechanism to be manufactured with less complexity and therefore at a lower cost.

[0008] For example, the door may have different (horizontal) distances to the cabin wall in different sections of the door gap. This can occur with a telescopic sliding door, whose sliding door leaves are usually offset horizontally from each other. Additionally, the horizontal distances between the door leaves can vary due to inaccuracies in manufacturing and / or assembly.

[0009] With conventional inflatable door seals, the contact pressure with which the door seal is pressed against the door or cabin wall is usually set to a value at which the door seal just closes the door gap at its widest point (e.g., 6 mm), possibly with an additional reserve in case the door gap has different widths in different areas and the door seal needs to bridge the gap simultaneously at its narrowest point (e.g., 3 mm) and at its widest point. Due to the contact pressure, particularly at the narrowest point of the door gap, high lateral forces can act on the door or cabin wall.

[0010] In contrast, the approach presented here offers the advantage that the lateral stress on the door or cabin wall is significantly reduced in the area of ​​the narrowest door gap, as the lateral forces are determined by the second hose, which is compressible with comparatively little force. Nevertheless, the door gap can be adequately sealed in the area of ​​its greatest width.

[0011] A second aspect of the invention relates to a method for controlling an elevator system, wherein the elevator system comprises an elevator shaft and an elevator car movable in the elevator shaft, wherein the elevator car comprises a car wall with a door opening, a door for closing the door opening, and the door seal described above and below, wherein, when the door closes the door opening, it is separated from the car wall by a door gap to be sealed, and wherein the door seal is mounted on the car wall and / or the door such that, when the door closes the door opening, the first hose and the second hose are opposite each other within the door gap in the bridging direction and extend at least partially around the door opening. The elevator system further comprises a pressure supply unit connected to the pressure connection for providing the fluid pressure. The method comprises at least the following steps: When it is detected that the door seal is to be activated, i.e., the door gap is to be sealed: a first control signal is generated to activate the pressure supply unit, so that the fluid pressure in the first hose reaches a first value at which the first hose assumes its final shape, whereby the first hose in its final shape is enlarged in the bridging direction compared to the initial shape at least to the extent that the door seal bridges the door gap; when it is detected that the door seal is to be deactivated, i.e., the door gap is to be released: a second control signal is generated to activate the pressure supply unit, so that the fluid pressure in the first hose reaches a second value at which the first hose again assumes its initial shape.

[0012] The process can be executed automatically by a processor.

[0013] The pressure supply unit can, for example, include a pneumatic and / or hydraulic pump for pumping a gas or liquid. Additionally, the pressure supply unit can include at least one controllable valve for regulating the fluid pressure in the first hose. The pressure supply unit can, for example, be installed in the elevator car.

[0014] A third aspect of the invention relates to a control unit comprising a processor configured to execute the method described above and below. The control unit may include hardware and / or software modules. In addition to the processor, the control unit may include memory and data communication interfaces for data communication with peripheral devices. The control unit may, for example, be connected to or be part of a higher-level elevator control system for data communication. Alternatively, the control unit may be a door control unit for controlling the elevator car door.

[0015] Features of the process can also be interpreted as features of the control unit, and vice versa.

[0016] A fourth aspect of the invention relates to an elevator system comprising an elevator shaft and an elevator car movable within the elevator shaft, the car comprising a car wall with a door opening, a door for closing the door opening, and the door seal described above and below, wherein, when the door closes the door opening, it is separated from the car wall by a door gap to be sealed, and wherein the door seal is mounted on the car wall and / or the door such that, when the door closes the door opening, the first hose and the second hose are opposite each other within the door gap in the bridging direction and extend at least partially around the door opening. Furthermore, the elevator system comprises a pressure supply unit connected to the pressure connection for providing the fluid pressure and the control unit described above and below.

[0017] Further aspects of the invention relate to a computer program and a computer-readable medium on which the computer program is stored.

[0018] The computer program includes instructions that, when the computer program is executed by the processor, cause it to perform the procedure described above and below.

[0019] The computer-readable medium can be a volatile or non-volatile data storage medium. For example, the computer-readable medium can be a hard drive, a USB storage device, RAM, ROM, EPROM, or flash memory. The computer-readable medium can also be a data communication network that enables the download of program code, such as the internet or a data cloud (cloud).

[0020] Features of the procedure described above and below can also be understood as features of the computer program and / or the computer-readable medium, and vice versa.

[0021] Without limiting the scope of the invention in any way, embodiments of the invention may be considered to be based on the ideas and findings described below.

[0022] The hoses can be made from the same or different sealing materials. The sealing material can be, for example, an elastomer, in particular an elastomer comprising a silicone compound.

[0023] For example, the final shape can be 1 mm to 10 mm larger in the bridging direction compared to the initial shape. Depending on the (largest or smallest) width of the door gap, other size deviations between the initial and final shapes are also possible.

[0024] The second hose can, for example, be elastically compressible transversely to its longitudinal direction, meaning it can be compressed in such a way that, in the compressed state, it is prestressed by a restoring force acting in the direction of its (uncompressed) original shape. This allows the second hose to return to its original shape on its own when no compression force is applied to it.

[0025] The second hose, for example, can be compressed to varying degrees along its length when the door seal is active. This allows fluctuations in the width of the door gap to be compensated for without subjecting the door or cabin wall to excessive pressure and / or bending stress.

[0026] The hoses can have the same cross-sectional shape and / or size when unloaded, or they can differ in their cross-sectional shape and / or size. For example, the first hose can have an elliptical cross-section and the second hose a circular cross-section (or vice versa). A box-shaped or teardrop-shaped cross-section is also possible for the first and / or second hose.

[0027] In the simplest case, the pressure equalization opening can be an open end of the second hose. Alternatively, the pressure equalization opening can be an opening in a surface of the second hose's outer casing.

[0028] According to one embodiment, the first hose and the second hose can be joined together to form a hose assembly. This hose assembly can be manufactured, for example, by extrusion from the same sealing material. However, it is also possible for the second hose to be made of a different, particularly softer, sealing material than the first hose and / or the rest of the hose assembly. These embodiments allow for inexpensive manufacturing and easy (dis)assembly of the door seal.

[0029] According to one embodiment, the hose assembly can be mounted on the cabin wall such that the first hose runs between the second hose and the cabin wall. Alternatively, the hose assembly can be mounted on the door such that the first hose runs between the second hose and the door. This further simplifies the (dis)assembly of the door seal. In particular, this can facilitate the connection of the first hose to the pressure supply unit.

[0030] The first and second hoses can also be designed as separate, individually mountable hoses. For example, in this case, the first hose can be mounted on the cabin wall and the second hose on the door (or vice versa).

[0031] According to one embodiment, the second hose can have a plurality of pressure equalization openings distributed along its length. In particular, a surface of the second hose can have several pressure equalization openings. For example, the pressure equalization openings can be arranged in several rows on opposite sides of the second hose. In this way, the force required to compress the second hose can be further reduced.

[0032] According to one embodiment, the first hose can be elastically deformable in such a way that it is prestressed in its final shape with a restoring force acting in the direction of its initial shape. The elastically resilient properties of the first hose can be achieved, for example, by selecting a suitable sealing material and / or a suitable cross-sectional shape. This causes the first hose to return to its initial shape on its own when the pressure equalizes between its interior and its surroundings.

[0033] According to one embodiment, the first hose in its initial form can have an elliptical cross-section. This prevents excessive stretching of the first hose and can improve the durability of the door seal.

[0034] According to one embodiment, the longitudinal direction of the elliptical cross-section in the assembled state of the door seal can run obliquely or orthogonally to the bridging direction. The longitudinal direction of the elliptical cross-section can correspond to a principal axis of its elliptical shape. This has the advantage that the first tube in its final form is pre-tensioned with a restoring force acting in the direction of the initial shape without being excessively stretched. This improves the durability of the door seal.

[0035] According to one embodiment, the first hose can have an elongated first profile on its outer surface, which is designed to engage in an elongated first profile recess of the elevator car in a form-fit and / or force-fit manner. The first hose and the first profile can, for example, have longitudinal directions parallel to each other. The first profile can, for example, be made of the same sealing material and / or be manufactured in the same manufacturing step as the first hose and / or the hose assembly.

[0036] Additionally or alternatively, the second hose can have an elongated second profile on its outer surface, designed to engage positively and / or non-positively with an elongated second profile receptacle in the elevator car. The second hose and the second profile can, for example, have parallel longitudinal directions. The second profile can, for example, be made of the same sealing material and / or manufactured in the same manufacturing step as the second hose and / or the hose assembly.

[0037] This simplifies the (dis)assembly of the respective hose. Furthermore, such profiles can be manufactured particularly cost-effectively through extrusion together with the respective hose.

[0038] According to one embodiment, an outer surface of the first hose and / or the second hose in a contact section, which in the sealed state of the

[0039] The door seal, where it touches the door and / or the cabin wall, must have a structure that reduces friction. This structure can, for example, consist of numerous elongated protrusions whose longitudinal directions may be parallel to each other and / or to the longitudinal direction of the door seal. Other friction-reducing structures are also possible, such as grid-like or studded structures. In this way, unwanted adhesion of the door seal to the door or cabin wall can be prevented when the seal is in its active state.

[0040] According to one embodiment, the difference between the first and second values ​​can be between 0.5 bar and 1.5 bar. Such a range proved particularly practical in tests with typical door gap dimensions.

[0041] Advantageous embodiments of the invention are further explained below with reference to the accompanying drawings, whereby neither the drawings nor the explanations are to be interpreted as limiting the invention in any way. Fig. 1 shows an elevator system according to an embodiment of the invention. Fig. 2 shows a cross-sectional view of a section of an elevator car made of Fig. 1 with a door seal according to an embodiment of the invention in the active state. Fig. 3 shows a cross-sectional view of a section of an elevator car made of Fig. 1 with a door seal according to an embodiment of the invention in the inactive state. Fig. 4 shows a cross-sectional view of a door seal according to an embodiment of the invention in various states. Fig. 5 shows a side view of a door seal according to an embodiment of the invention.

[0042] The figures are merely schematic and not to scale. The same reference symbols denote identical or equivalent features in the different drawings.

[0043] Fig. 1 Figure 1 shows an elevator system 1 comprising an elevator shaft 2 and an elevator car 3 that travels vertically between different floors within the elevator shaft 2. The elevator car 3 includes a cabin wall 4 with a door opening 5 through which the elevator car 3 can be entered from the floors. The door opening 5 can be closed by means of a door 6, here by way of example a sliding door with two door leaves 7 that can be moved horizontally relative to each other in opposite directions.

[0044] Fig. 1 Figure 3 shows the elevator car 3 in the closed state, in which the door 6 closes the door opening 5 with its two door leaves 7.

[0045] A door seal 8 runs around the door opening 5, more precisely to the left, right and above the door opening 5, which in the active state creates a horizontal door gap 9 (see Fig. 2 und Fig. 3 ) seals between the cabin wall 4 and the door leaves 7.

[0046] As in Fig. 2, Fig. 3 , Fig. 4 und Fig. 5 As can be seen, the door seal 8 comprises a first hose 10 and a second hose 11 made of an elastically deformable sealing material, for example an elastomer such as EPDM, MVQ, silicone or VMQ.

[0047] The two hoses 10, 11 can, for example, be connected to each other to form a hose assembly 12 (see Fig. 4 und Fig. 5 Alternatively, the two hoses 10, 11 could be separate, individually mountable hoses.

[0048] In this example, the door seal 8 is mounted on the cabin wall 4 in such a way that the two hoses 10, 11 are at least partially opposite each other in a (horizontal) bridging direction 13, in which the door seal 8 is intended to bridge the door gap 9 in the active state of the door seal 8.

[0049] Alternatively, the door seal 8 can be mounted on the door 6 and moved together with it.

[0050] The positions of the two hoses 10, 11 with respect to the bridging direction 13 can also be reversed.

[0051] The first hose 10 has a pressure connection 14 (see Fig. 1 ) which is fluidically connected to a pressure supply unit 15 for providing a fluid pressure, for example in the form of compressed air. The pressure supply unit 15 can include an electrically controlled pneumatic valve for controlling the fluid pressure.

[0052] By changing the fluid pressure within the first hose 10, it is switched between an initial state (see Fig. 3 ) and an end form that is larger in the bridging direction 13 compared to the initial form (see Fig. 2 deformable.

[0053] The second hose 11, however, is not connected to the pressure supply unit 15. Instead, the second hose 11 includes at least one pressure equalization opening 16, for example, a plurality of lateral pressure equalization openings 16, which may be arranged distributed over a longitudinal section of the second hose 11 or its entire length (see Fig. 5 ).

[0054] The pressure equalization opening(s) 16 enables pressure equalization between a cavity of the second hose 11 and its surroundings whenever the second hose 11 is horizontally compressed when the door seal 8 is activated. This significantly reduces the lateral load on the door 6, i.e., the door leaves 7, exerted by the door seal 8 in its active state. Furthermore, it compensates for variations in the width of the door gap 9, such as those caused by horizontally misaligned door leaves 7 (e.g., in the case of a telescopic sliding door) or by inaccuracies in manufacturing and / or assembly, without the door seal 8 subjecting the door leaves 7 to excessive and / or uneven loads.

[0055] Fig. 2 Figure 1 shows the active state of the door seal 8, in which the first tube 10 is inflated to such an extent that the second tube 11 makes contact with the door leaves 7 opposite the cabin wall 4 with a section of its outer surface. The second tube 11 can be compressed to a greater or lesser degree. In the most favorable case, the second tube 11 only lightly rests against the respective inner surface of the door leaves 7, so that the door gap 9 is sealed, but the door leaves 7 are not subjected to any significant stress by the door seal 8. Even if the second tube 11 is significantly deformed, the door leaves 7 are still not subjected to any significant stress by the door seal 8.

[0056] Fig. 3 shows the inactive state of the door seal 8, in which the door gap 9 is released so that the door leaves 7 can be moved freely.

[0057] The first hose 10, for example, can have an elliptical cross-section in its initial form. This has the effect that the first hose 10 in its final form is pre-tensioned with a restoring force acting in the direction of its initial shape, i.e., opposite to the bridging direction 13, without being excessively stretched. This can improve the durability of the door seal 8.

[0058] As in Fig. 3 As shown, a principal axis 17 of the elliptical shape (i.e., its longitudinal direction) can run orthogonally to the bridging direction 13. Thus, the elongation of the first tube 10 can be reduced to a minimum.

[0059] As in Fig. 4 As shown, the door seal 8 in the contact section, which is here exemplified by a section of the outer surface of the second hose 11, can have a friction-reducing structure 18 that helps to avoid unwanted adhesion of the contact section to the respective counterpart, here to the door leaves 7, in the active state of the door seal 8.

[0060] In In this example, structure 18 is formed by a plurality of elongated protrusions on the outer surface, the longitudinal directions of which each run parallel to the longitudinal direction of the second tube 11. However, other structures that reduce static friction are also possible, such as grid-like or knob-like structures.

[0061] Additionally, the one in Fig. 4 und Fig. 5 The hose assembly 12 shown is exemplified by an elongated first profile 19 for mounting the door seal 8 on the cabin wall 4, which runs along an outer surface of the first hose 10 facing away from the second hose 11 in its longitudinal direction and, in the mounted state of the door seal 8, engages forcefully and / or form-fit into a corresponding first profile receptacle 20 of the elevator cabin 3.

[0062] The first profile 19 can in particular be manufactured as part of the hose assembly 12, i.e. from the same material and / or in the same manufacturing step as the two hoses 10, 11.

[0063] The first profile recess 20 can, for example, be formed by a U- or C-shaped profile strip embedded in the cabin wall 4.

[0064] Alternatively, the second hose 11 can be designed with a second profile in a corresponding manner, which can be connected to a second profile receptacle of the elevator car 3 in a force-fit and / or form-fit manner.

[0065] Fig. 4 It also shows different degrees of deformation of the door seal 8. Im In its inactive state (shown with dashed lines), the door seal 8 has its smallest height H0 with respect to the bridging direction 13. Its largest height Hmax, however, is reached when the first tube 10 assumes its final shape and the second tube 11 is barely compressed. Fluctuations in the width of the door gap 9 can be compensated for by compressing the second tube 11, while the first tube 10 maintains its final shape, in and / or against the bridging direction 13, to such an extent that the door seal 8 has an intermediate height H1 between the smallest height H0 and the largest height Hmax, sufficient to seal the door gap 9.

[0066] A difference between H 0 and H max can be, for example, 5 mm to 10 mm.

[0067] For example, the difference between H1 and Hmax can be 5 mm or less.

[0068] Basically, the door seal 8 can be divided into three sections: a base section for fixing to a corresponding counterpart, in particular for mechanical fixing and / or bonding; a pressure section that can be pressurized with compressed air to inflate the door seal 8; a compensation section with at least one pressure equalization opening 16, which can be compressed with low force and which can compensate for any lateral offset of the two door leaves 7.

[0069] It is possible that the compensation section, i.e., the second hose 11 forming the compensation section, is made of a softer material than the rest of the door seal 8. Thus, the lateral load acting on the door leaves 7 can be further reduced due to the improved force-displacement ratio.

[0070] The distance of the door seal 8 to the surface of the cabin wall 4 can be specified according to EN81-20, for example, to the following values: H 0 : 0 mm gap, i.e., the door seal 8 is flush with the cabin wall 4 and allows the door 6 to pass through without restriction; H 1 : 3 mm gap (this corresponds to the smallest permissible gap between the door 6 and the cabin wall 4); H max : 6 mm gap (this corresponds to the largest permissible gap between the door 6 and the cabin wall 4).

[0071] The fluid pressure for activating the door seal 8 can be adjusted so that the door seal 8 is extended up to its maximum height H. This ensures that the door seal 8 completely bridges the door gap 9 in all cases. A specific reserve pressure can also be provided.

[0072] The pressure supply unit 15 is equipped with a control unit 21 (see Fig. 1), for example, a door control unit of the elevator car 3, coupled, which includes a processor 22 configured to execute a procedure for controlling the elevator system 1, more precisely for activating or deactivating the door seal 8, by executing a computer program stored in a memory of the control unit 21, as described below.

[0073] To this end, the control unit 21 generates a first control signal 23 in a first step when it detects that the door seal 8 is activated, i.e., that the door gap 9 is to be sealed. This can occur, for example, shortly after the door 6 is closed. The first control signal 23 causes the pressure supply unit 15 to change the fluid pressure in the first hose 10, in particular to increase it until it reaches a first value at which the first hose 10 assumes its final shape. Thus, the door seal 8, with its contact section, rests against the door leaves 7 and seals the door gap 9.

[0074] If, however, the control unit 21 recognizes that the door seal 8 is to be deactivated again, i.e., that the door gap 9 is to be released again (which may be the case, for example, during travel shortly before the elevator car 3 stops at a floor), it generates a second control signal 24, which causes the pressure supply unit 15 to change the fluid pressure in the first hose 10, in particular to lower it so far that it reaches a second value at which the first hose 10 returns to its initial state, i.e., at which the door seal 8 again has its smallest height H 0, so that the door seal 8 is separated from the door leaves 7 by a sufficient air gap in good time before the door 6 opens.

[0075] The difference between the first and second values ​​can be, for example, 0.5 bar to 1.5 bar.

[0076] Finally, it should be noted that terms such as "having" or "comprising" do not exclude other parts or steps, and indefinite articles such as "a" or "an" do not exclude a plurality. Furthermore, it should be noted that features or steps described with reference to one of the foregoing embodiments may also be used in combination with features or steps described with reference to other of the foregoing embodiments. Reference numerals in the claims are not to be considered as a limitation.

Claims

1. Door seal (8) for a lift car (3), wherein the lift car (3) comprises a car wall (4) with a door opening (5) and a door (6) for closing the door opening (5), wherein the door (6), when it closes the door opening (5), is separated from the car wall (4) by a door gap (9) to be sealed, wherein the door seal (8) comprises: a first tube (10) made of an elastically deformable sealing material; wherein the first tube (10) has a pressure connection (14) for applying a fluid pressure to the first tube (10) and is deformable, by changing the fluid pressure, between an initial shape and a final shape enlarged in the bridging direction (13) compared to the initial shape; characterized in that the door seal (8) comprises at least one further second tube (11) made of an elastically deformable sealing material, wherein the door seal (8) can be mounted on the car wall (4) and / or the door (6) in such a way that the first tube (10) and the second tube (11), when the door (6) closes the door opening (5), lie opposite each other within the door gap (9) in a bridging direction (13) in which the door seal (8) is intended to bridge the door gap (9) and run at least partially around the door opening (5); wherein the second tube (11) has at least one pressure equalization opening (16) which is designed to enable pressure equalization between an interior and an environment of the second tube (11) when the second tube (11) is compressed.

2. Door seal (8) according to claim 1, wherein the first tube (10) and the second tube (11) are connected to each other to form a tube assembly (12).

3. Door seal (8) according to claim 2, wherein the tube assembly (12) can be mounted on the car wall (4) in such a way that the first tube (10) runs between the second tube (11) and the car wall (4); or wherein the tube assembly (12) can be mounted on the door (6) in such a way that the first tube (10) runs between the second tube (11) and the door (6).

4. Door seal (8) according to any one of the preceding claims, wherein the second tube (11) has a plurality of pressure equalization openings (16) distributed in its longitudinal direction.

5. Door seal (8) according to any one of the preceding claims, wherein the first tube (10) is elastically deformable in such a way that it is prestressed in the final shape with a restoring force acting in the direction of the initial shape.

6. Door seal (8) according to any one of the preceding claims, wherein the first tube (10) has an elliptical cross-section in the initial shape.

7. Door seal (8) according to claim 6, wherein a longitudinal direction (17) of the elliptical cross-section in the mounted state of the door seal (8) runs obliquely or orthogonally to the bridging direction (13).

8. Door seal (8) according to any one of the preceding claims, wherein the first tube (10) has an elongate first profile (19) on its outer surface, which profile is designed to engage in a form-fitting and / or frictionally engaged manner in an elongate first profile receptacle (20) of the lift car (3); and / or wherein the second tube (11) has an elongate second profile on its outer surface, which profile is designed to engage in a form-fitting and / or frictionally engaged manner in an elongate second profile receptacle of the lift car (3).

9. Door seal (8) according to any one of the preceding claims, wherein an outer surface of the first tube (10) and / or of the second tube (11) has a static-friction-reducing structure (18) in a contact portion which contacts the door (6) and / or the car wall (4) in the sealed state of the door gap (9).

10. Method for controlling a lift system (1), wherein the lift system (1) comprises a lift shaft (2) and a lift car (3) movable in the lift shaft (2); wherein the lift car (3) comprises a car wall (4) with a door opening (5), a door (6) for closing the door opening (5) and the door seal (8) according to any one of the preceding claims, wherein the door (6), when it closes the door opening (5), is separated from the car wall (4) by a door gap (9) that is to be sealed, and wherein the door seal (8) is mounted on the car wall (4) and / or the door (6) in such a way that the first tube (10) and the second tube (11), when the door (6) closes the door opening (5), lie opposite one another within the door gap (9) in the bridging direction (13) and run at least partially around the door opening (5); wherein the lift system (1) further comprises a pressure supply unit (15) connected to the pressure connection (14) for providing the fluid pressure; wherein the method comprises: if it is detected that the door seal (8) is to be activated: generating a first control signal (23) for controlling the pressure supply unit (15) so that the fluid pressure in the first tube (10) reaches a first value at which the first tube (10) assumes the final shape, wherein the first tube (10) in the final shape is enlarged in the bridging direction (13) compared to the initial shape at least to such an extent that the door seal (8) bridges the door gap (9); if it is detected that the door seal (8) is to be deactivated: generating a second control signal (24) to control the pressure supply unit (15) so that the fluid pressure in the first tube (10) reaches a second value at which the first tube (10) resumes the original shape.

11. Method according to claim 10, wherein a difference between the first value and the second value is 0.5 bar to 1.5 bar.

12. Control unit (21), comprising a processor (22) that is configured to carry out the method according to claim 10 or 11.

13. Lift system (1), comprising: a lift shaft (2); a lift car (3) which can be moved in the lift shaft (2) and which comprises a car wall (4) with a door opening (5), a door (6) for closing the door opening (5) and the door seal (8) according to any one of claims 1 to 9, wherein the door (6), when it closes the door opening (5), is separated from the car wall (4) by a door gap (9) that is to be sealed, and wherein the door seal (8) is mounted on the car wall (4) and / or the door (6) in such a way that the first tube (10) and the second tube (11), when the door (6) closes the door opening (5), lie opposite one another within the door gap (9) in the bridging direction (13) and run at least partially around the door opening (5); a pressure supply unit (15) connected to the pressure connection (14) for providing the fluid pressure; and the control unit (21) according to claim 12.

14. Computer program comprising commands that cause a processor (22) to carry out the method according to any one of claims 10 to 11 when the computer program is executed by the processor (22).

15. Computer-readable medium on which the computer program according to claim 14 is stored.

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