Sealing casing for an electrical cable

Abstract

Sealing sleeve for an electrical cable. Sealing sleeve (5), configured to be traversed by an electrical cable and comprising a sealing gasket (52) mounted in a ring (51) and comprising a sleeve (55), having an internal radial wall (65) and being radially extensible, so that the internal radial wall (65) conforms to the electrical cable passing through the sealing sleeve (5) via the sleeve (55). To ensure that the sealing gasket is suitable for various cable sizes while maintaining a seal even when the cable has pronounced irregularities, the internal radial wall (65) has radial ribs (66) directed inward toward the sleeve (55) to be in contact with the electrical cable. Figure for the abbreviation: [FIG 2]

Description

Title of the invention: Sealing casing for an electrical cable

[0001] The present invention relates to a sealing barrel, configured to be traversed by an electrical cable, as well as an assembly comprising the sealing barrel and the electrical cable, and finally an electrical device comprising the sealing barrel.

[0002] The invention relates to the field of electricity distribution, in particular to the field of sealing means for connecting an electrical cable. The field considered includes, in particular, electrical cables belonging to an overhead electrical distribution network. However, without limitation, the invention can be applied to cables for other types of networks, for example, an underground electrical network, a domestic electrical network, a very low voltage electrical network, or even a wired telecommunications network.

[0003] For an overhead power line intended to carry low-voltage electricity, i.e., between 100 and 1000 V (volts), an electrical cable with a diameter between 10 and 30 mm, for example 16 mm, can be used. Generally, this electrical cable has an externally protective, electrically insulating, smooth sheath with a circular cross-section. This sheath generally encloses an electrically conductive core made up of several twisted metallic strands.

[0004] This cable is intended to pass through or be connected to electrical devices such as a branch, network, or street lighting connector, a branch or network sleeve, an insulated lug, a terminal block, or a fitting, etc. In this case, the cable passes through a conduit, with which the electrical device in question is equipped, to emerge inside the electrical device and be electrically connected to it. It may be desirable to ensure a seal between the conduit and the cable at the conduit to prevent the accidental introduction of objects and liquids into the electrical device through the opening through which the cable passes. This is particularly advisable when the electrical device is located outdoors, especially for an overhead network electrical device.At the same time, for the electrical device to be versatile, the same drum must be adapted to allow cables of various cross-sections to pass through it, or to have an irregular external surface.

[0005] To ensure a watertight seal, it is known to equip a drum with two seals, arranged one behind the other so that the cable passes through them successively. The first seal is a lip seal with a centered opening, and the second seal is a lip seal with an off-center opening and a smaller diameter than that of the first seal. When the cable inserted into the drum is of small diameter, the second seal ensures a watertight seal, as its small diameter opening conforms to the shape of the cable. Since the opening of the second seal is off-center, the cable is held against The edge of the opening of the first seal ensures proper placement of the small-diameter cable. When the cable inserted into the barrel is of a larger diameter, the seal is ensured by the first seal, whose opening conforms to the shape of the cable while ensuring its correct placement.

[0006] However, some cables have a particularly irregular cross-section. In particular, to indicate whether it is a neutral or phase cable, some cables have one or more longitudinal ribs forming a relatively deep longitudinal groove, for example 0.5 mm (millimeters), on one side of the cable only. Since these ridges are particularly pronounced, it is difficult to design a seal that effectively provides a watertight seal for the cable while also being suitable for cables of various diameters.

[0007] It is these drawbacks that the invention particularly intends to remedy by proposing a new sealing barrel, which, while being adapted to be traversed by cables of different sizes, is capable of ensuring a seal even when the cable has a cross-section with pronounced irregularities.

[0008] The invention relates to a sealing barrel, configured to be traversed by an electrical cable and comprising a ring and a sealing gasket mounted in the ring. The sealing gasket is formed in one piece and comprises a sleeve. The sleeve has an internal radial wall centered on a sleeve axis and is radially extensible with respect to the sleeve axis, so that the internal radial wall conforms to the electrical cable when the electrical cable passes through the sealing barrel via the sleeve. According to the invention, the internal radial wall has radial ribs that project radially inward toward the inside of the sleeve to be in contact with the electrical cable when the electrical cable passes through the sealing barrel. These ribs are distributed along the sleeve axis and each surrounds the sleeve axis, being centered on the sleeve axis.

[0009] One idea underlying the invention is to provide the sleeve with sufficient elasticity to adapt to different sizes of electrical cable. When the received electrical cable has pronounced surface irregularities, such as longitudinal ribs, the radial ribs of the sleeve deform locally, and at least some of the radial ribs conform to the shape of these irregularities. Preferably, the radial ribs of the sleeve, when not deformed, are designed to have a radial height close to that of the longitudinal ribs or irregularities of the electrical cable. At the very least, the succession of several radial ribs significantly reduces the risk of foreign matter and moisture entering beyond the sealing sleeve. The presence of the radial ribs advantageously eliminates the need for a thick sealing lobe around the cable, so that the sleeve can be designed to be particularly elastic and adapt to a wide range of electrical cable sizes.

[0010] Preferably, each radial rib comprises: a front axial face, which is perpendicular to the handle axis; a rear axial face, which is parallel to the front axial face; and a radial apex face, which is parallel to the handle axis and connects the front axial face to the rear axial face of the same radial rib.

[0011] Preferably, for each radial rib, we define: a rib length, measured parallel to the handle axis, connecting the rear axial face to the front axial face and measuring between 0.2 and 0.7 mm; and a rib height, measured radially to the handle axis, connecting the radial top face to a radial bottom face, formed by the internal radial wall between two successive radial ribs, the rib height measuring between 0.2 and 0.7 mm.

[0012] Preferably, the radial ribs are regularly spaced from each other along the axis of the handle.

[0013] Preferably, at least three radial ribs are provided.

[0014] Preferably, the sealing gasket further comprises: a belt, through which the sealing gasket is mounted in the ring, the belt surrounding the sleeve; and a membrane, which connects the belt with the sleeve, so that the sealing gasket completely closes a radially delimited space between the sleeve and the belt, all around the axis of the sleeve.

[0015] Preferably, the membrane comprises: an intermediate part, which extends all around the axis of the sleeve, which is radially arranged between the belt and the sleeve and extends axially beyond the belt and the sleeve; an external part, which extends all around the axis of the sleeve and connects a front axial end of the belt to the intermediate part; and an internal part, which extends all around the axis of the sleeve and connects a front axial end of the sleeve to the intermediate part, the internal part having a divergent shape, from the front axial end of the sleeve to the intermediate part.

[0016] The invention also relates to an assembly, comprising the sealing barrel as defined above and the electrical cable, the electrical cable passing through the sealing barrel via the sleeve, the sleeve being radially extended by the electrical cable, the internal radial wall conforming to the electrical cable and the radial ribs being in contact with the electrical cable.

[0017] Preferably, the electrical cable has a longitudinal rib.

[0018] The invention also relates to an electrical device, comprising: the sealing barrel as defined above; a housing, carrying the ring of the sealing barrel; and an electrical connection means, disposed inside the housing and being configured to be electrically connected to the electrical cable, while the electrical cable passes through the sealing barrel.

[0019] The invention and other advantages thereof will become more apparent in the light of the following description of embodiments according to the invention, this description being given solely by way of example and made with reference to the drawings below.

[0020] [Fig-1] Fig. 1 is a perspective view of an electrical device comprising a sealing barrel according to an embodiment conforming to the invention.

[0021] [Fig.2] The [Fig.2] is a longitudinal section of the electrical device of the [Fig.1].

[0022] [Fig.3] Fig.3 is a longitudinal section of a sealing gasket belonging to the sealing barrel of figures 1 and 2.

[0023] [Fig.4] [Fig.4] is a view similar to that of [Fig.3], where the sealing gasket is crossed by an electrical cable.

[0024] [Fig.5] The [Fig.5] is a cross-section of the cable of the [Fig.4].

[0025] The term "electrical device" encompasses any electrical device comprising a housing containing an electrical connection means to which an electrical cable is designed to be electrically connected, as well as a sealing sleeve through which the cable passes when the cable is electrically connected to the electrical connection means. For example, in the case of an overhead power network, the electrical device may consist of a branch, network, or street lighting connector, a branch or network sleeve, an insulated lug, a terminal block, or an electrical fitting.

[0026] A suitable cable 1 is shown in Figures 4 and 5. The cable 1 extends along a cable axis XL. The cable 1 is flexible so that the axis XI follows the curvature of the cable 1 and is not necessarily straight. As can be seen in [Fig. 5], the cable 1 comprises an electrically conductive core 11, which extends along the axis XI and is centered on the axis XL. The core 11 is here made up of seven twisted metal strands. However, the core 11 could be made up of a single conductive metal strand forming a solid, or of a number of metal strands other than seven, for example, from eight to nineteen strands.

[0027] The cable 1 also includes a sheath 12, which is electrically insulating and surrounds the core 11, to protect it, all around the axis XI1 and extends over most of the length of the cable 1. Externally, the sheath 12 has a generally circular cross-section, centered on the axis XL. In other words, the sheath 12 includes a main wall 13 with a circular cross-section. This circular cross-section has, for example, a diameter between 10 and 30 mm. Preferably, the sheath 12 includes ribs 14, here three ribs 14, which extend along the entire length of the sheath 12 and are radially raised by relation to the main wall. The number of ribs 14 on the cable 1 informs a technician about the function of this cable. For example, the fact that the cable has one rib 14 indicates that the cable is a cable for a first phase, whereas a cable with two ribs would be a cable for a second phase, a cable with three ribs would be a cable for a third phase, and a cable without ribs, or with a multitude of ribs 14 regularly distributed around its entire circumference, would be a neutral cable.

[0028] For example, each rib 14 protrudes from the wall 13 by a radial height R14 of approximately 0.5 mm. For example, each rib 14 is approximately 1 mm wide, in a direction perpendicular to a radius from the axis XL. For example, two successive ribs 14 are spaced approximately 0.5 mm apart around the axis XL.

[0029] Figures 1 and 2 show an example of an electrical device 2, which consists of an insulated lug, which serves to electrically and mechanically connect the electrical cable 1 to a terminal of an electrical device, not shown.

[0030] The device 2 mainly comprises a housing 3, an electrical connection means 4 and a sealing barrel 5.

[0031] The housing 3 is made entirely of electrically insulating material and encloses the connection means 4 to electrically insulate it and protect it from the outside, in a sealed manner. The housing 3 defines a main axis X3, the axis XI of the cable 1 being designed to be coaxial, or at least parallel, to the axis X3 when the cable 1 is received in the housing 3 by being connected to the connection means 4.

[0032] In the present example, along the X3 axis, the housing 3 comprises an opposite longitudinal end 31 and a longitudinal end 32.

[0033] The connection means 4 comprises a fixed, electrically conductive contact 41. The contact 41 is formed here by a lug. The contact 41 includes an internal portion 43, contained within the housing 3 between the ends 31 and 32. The internal portion 43 is designed to make electrical contact with the core 11 of the cable 1 inside the housing 3. In the example, to form a lug, the fixed contact 41 also includes an electrical connection loop 42, formed as a single unit with the internal portion 43. The electrical connection loop 42 is located outside the housing 3 to be screwed onto the terminal of the electrical equipment (not shown), in order to electrically connect the cable 1 to this equipment. The contact 41 passes through the end 31, so that the internal part 43 is disposed inside the housing 3 between the ends 31 and 32 and the loop 42 is disposed outside the housing 3 beyond the end 31.

[0034] The sealing barrel 5 is formed at the end 32 of the housing 3. It is through the sealing barrel 5 that the cable 1 is introduced into the housing 3. Then, a The end of the cable 1 is received inside the housing 3 so that the core 11 is in contact with the inner part 43. For this, the sheath 12 is stripped for the end received inside the housing 3. Alternatively, the sheath 12 is left, but the inner part 43 is provided to have piercing elements, such as teeth, to pierce the sheath 12 and reach the core 11.

[0035] The connection means 4 advantageously includes a means 44 for maintaining the cable 1 in contact with the fixed contact 41. In this way, the cable 1 is secured to the device 2. Here, the means 44 is in the form of a shear-head screw, which passes through the housing 3 radially with respect to the axis X3. Outside the housing 3, the screw has an electrically insulating head 45 for tightening with a tool. In this example, it is a shear head, which breaks when sufficient tightening torque is applied. Inside the housing 3, the screw has a screw body 46, which, when the screw is tightened, pinches the cable between the inner part 43 and the body 46, to hold the cable 1 and ensure electrical contact between the inner part 43 and the core 11 of the cable 1.

[0036] The sealing barrel 5 comprises a ring 51 and a sealing gasket 52. In this example, the ring 51 forms the end 32 of the housing 3. When the cable 1 is connected to the means 4, the cable 1 passes through the ring 51. The ring 51, like the rest of the housing 3, is made of a rigid and electrically insulating material. The ring is centered on the main axis X3.

[0037] Unlike the housing 3 and the ring 51, the seal 52 is made of an elastic material, for example, an elastomer. For example, an elastic material with a hardness of 60 Shore A is chosen. The seal 52 is formed in one piece, that is, it is formed from a single piece of the same material, without assembly. Advantageously, the seal 52 is formed in a single molding operation in a single mold by injecting the elastomer into that mold.

[0038] The seal 52 is mounted in the ring 51, which holds the seal 52 in place. The seal 52 serves to provide a dust and liquid seal between the ring 51 and the cable 1 that passes through said ring 51.

[0039] The seal 52 comprises a belt 53, a membrane 54 and a sleeve 55.

[0040] In what follows, all considerations concerning the shape of the seal 52 relate to a situation where the seal 52 is at rest, undeformed, unless otherwise stated. Since the seal 52 is deformable, its shape changes during use, particularly under the action of the ring 51 and the cable 1.

[0041] The belt 53 has a tubular shape centered on the axis X3. The seal 52 is mounted in the ring 51 via the belt 53. For this purpose, the belt 53 has an external radial wall 56, which is in sealing contact with a complementary internal radial wall 61 belonging to the ring 51, as shown in the figure. [Fig. 1]. Thus, the ring 51 surrounds the belt 53 around the axis X3. Preferably, the outer radial wall 56 is provided with outer radial ribs 57, here seven outer radial ribs 57, which are distributed along the axis X3. The ribs 57 have a triangular cross-section, as can be seen in Figures 3 and 4. In [Fig. 2], the ribs 57 are shown undeformed. However, in reality, when the seal 52 is received in the ring 51, the ribs 57 are slightly compressed radially inwards to conform to the cylindrical shape with a circular base of the inner radial wall 61 of the ring 51. Thus, the ribs 57 ensure the desired seal, while axially holding the seal 52 in place in the ring 51 by axial adhesion with the ring 51.

[0042] Along the axis X3, the belt 53 has a rear axial end 58 and a front axial end 59. Preferably, the end 58 is turned inward toward the housing 3, and the end 59 is turned outward toward the housing 3. Here, the end 58 bears axially rearward against the means 4 to axially position the seal 52. Alternatively, the end 58 could bear against a portion of the housing 3 or the ring 51. Conversely, the front end 59 preferably bears axially forward against a curved edge 60 belonging to the ring 51, formed at the end 32. In the example, the edge 60 is curved inward so as to wrap around the end 59 of the belt 53. In other words, the end 59 is radially captured between the edge 60 curved and the internal radial wall 61 of the ring 51.In addition to axially supporting the belt 53, the edge 60 opposes a radial inward deformation of the belt 53.

[0043] Preferably, at its rear end 58, the belt 53 carries an internal collar 62, which projects radially inwards from the internal radial wall 61. The collar 62 advantageously extends all around the axis X3. The collar 62 aims to stiffen the belt 53, while also ensuring guidance of the cable 1 towards the means 4 during insertion of the cable 1 through the barrel 5.

[0044] The sleeve 55 is tubular in shape, or slightly conical as it diverges outwards from the housing 3. The sleeve 55 is centered on an axis X55, referred to as the "sleeve axis". The axis X55 is parallel to the axis X3 but does not coincide. However, it could be envisaged that the axes X55 and X3 coincide. The sleeve 55 extends all around the axis X55.

[0045] The sleeve 55 is radially extensible. Consequently, when the cable 1 passes through the seal 52, and thus the barrel 5, the cable 1 passes through the sleeve 55, extending it radially outwards, relative to the axis X55, as shown in [Fig. 4]. Thus extended, the sleeve 55 elastically conforms to the contours of the cable 1 to ensure a seal, slightly compressing the cable 1 by elasticity. The axes X55 and XI become coaxial.

[0046] When the joint 52 is not deformed, as shown in figures 1 to 3, the sleeve 55 is surrounded by the belt 53, being radially at a distance from the belt 53. Preferably, no part of the joint 52 is provided radially between the belt 53 and the sleeve 55 to allow the sleeve 55 to extend radially towards the belt 53 when the joint 52 receives the cable 1. The sleeve 55 has a rear axial end 63, facing inwards towards the housing 3, and a front axial end 64, facing outwards. Preferably, along the axis X3, the ends 63 and 64 of the sleeve 55 are arranged between the ends 58 and 59 of the belt 53.

[0047] Preferably, the rear axial end 63 of the sleeve 55 is left free, i.e., is not attached to any other element. The end 63 opens into the housing 3. The front axial end 64 of the sleeve 55 is attached to the membrane 54, through which the sleeve 55 is attached to the belt 53.

[0048] Optionally, the rear axial end 63 could be provided to be sealed to prevent the accidental introduction of foreign bodies into the housing 3 before the cable 1 is installed. For the introduction of the cable 1, this sealing is removed or perforated.

[0049] The sleeve 55 has an internal radial wall 65. The wall 65 connects the end 63 to the end 64 and is oriented inwards. When the cable 1 is received in the sleeve 55, the wall 65 comes into contact with the cable 1, conforming to its shape to ensure a seal, by virtue of the elasticity of the sleeve 55, which then grips the cable 1. The internal radial wall 65 is centered on the axis X55.

[0050] To improve the seal and, in particular, to better conform to the shape of the longitudinal ribs 14 of the cable 1, the inner radial wall 65 has radial ribs 66, which project radially inwards towards the inside of the sleeve 55 to be in contact with the cable 1 when the cable 1 passes through the shaft 5. Here, six ribs 66 are provided. However, a number of ribs 66 other than six may be provided. Preferably, at least three ribs 66 are provided to ensure the seal.

[0051] Each rib 66 surrounds the axis X55, extending all around the axis X55 and being centered on this axis X55. Each rib 66 is continuous, that is, uninterrupted around the axis X55. The ribs 66 are distributed along the axis X55, preferably with regular spacing from one another. Preferably, the ribs 66 are regularly distributed from the end 63 to the end 64, so as to occupy the entire inner radial wall 65.

[0052] As shown more precisely in [Fig. 3], each radial rib 66 preferably has a square or rectangular radial cross-section. More precisely, each rib 66 advantageously has a front axial face 67, a rear axial face 68, and a radial apex face 69. For each rib 66, the radial apex face 69 connects face 67 to face 68. Two successive ribs 66 are connected by a radial bottom face 70. Two successive ribs 66 define a groove, delimited by face 70, face 67 of one of the ribs 66, and face 68 of the Next rib 66. Here, five grooves are therefore planned. The axial faces 67 and 68 are all flat, or essentially flat, being parallel to each other and to a plane perpendicular to the X55 axis. In other words, each face 67 and 68 forms a flat ring centered on the X55 axis. Face 69 is cylindrical with a circular base, centered on the X55 axis. Face 70 is cylindrical with a circular base, centered on the X55 axis, with a larger diameter than face 69. In other words, faces 69 and 70 are parallel to the X55 axis.

[0053] As shown in [Fig. 3], a rib length L69, measured parallel to the X55 axis, is defined, connecting face 68 to face 67. A rib height R66, which is a radial height, i.e., measured radially to the X55 axis, is defined, connecting face 69 to face 70. An axial inter-rib distance L70, measured parallel to the X55 axis, is defined, connecting face 67 of one of the ribs 66 to the rear axial face 68 of the next rib 66. Preferably, the rib length L69, the axial distance L70, and the rib height R66 are of the same value. Preferably, they measure between 0.2 and 0.7 mm, for example, 0.5 mm. Preferably, the R66 height of the ribs 66 is equal to, or slightly greater than, the R14 height of the ribs 14 of cable 1.When the cable 1 is received in the sleeve 55, each rib 66 is locally flattened by each rib 14, but remains deployed between two successive ribs 14, so as to at least partially fill the gap between these two ribs 14. The seal is thus ensured by the gasket 52 even between these two ribs 14. Even if each rib 66 does not completely fill this gap, the succession of ribs 66 forms a barrier which strongly limits the introduction of water and foreign bodies into the interior of the housing 3.

[0054] The membrane 54 connects the belt 53 with the sleeve 55, such that the seal 52 completely closes a radially delimited gap between the sleeve 55 and the belt 53, all around the axis X55. In other words, in projection along the axis X55, the seal 52 forms a single orifice, delimited by the sleeve 55 and centered on the axis X55, the membrane 54 filling the entire circumference of the sleeve 55 and the entire interior of the belt 53. When the cable 1 is inserted into the seal 52, the seal 52 provides a seal up to the outer radial wall 56.

[0055] The membrane 54 is in the form of a bellows, which serves to keep the sleeve 55 in the center of the belt 53, while allowing the elastic extension of the sleeve when the cable 1 is received there.

[0056] Preferably, the membrane 54 comprises an inner portion 71, an intermediate portion 72, and an outer portion 73. Each of these portions 71, 72, and 73 extends all around the axis X55. The inner portion 71 connects the front axial end 64 of the sleeve 55 to the intermediate portion 72. The outer portion 73 connects the front axial end 59 of the belt 53 to the intermediate portion 72. Preferably, following The axis X55, the end 59 is disposed between the intermediate part 72 and the end 58. In other words, the intermediate part extends axially beyond the belt 53 and the sleeve 55. Preferably, the edge 60 and the intermediate part 72 are approximately at the same axial height along the axis X55.

[0057] Radially with respect to the axis X55, the intermediate portion 72 is arranged between, externally, the belt 53 and, internally, the sleeve 55. From the end 64 to the intermediate portion 72, the inner portion 71 diverges, that is, widens radially. Preferably, the inner portion 71 diverges in a hyperboloid or conical shape. This shape facilitates the insertion of the cable 1 through the sleeve 55. At the end 64, the last rib 66 projects beyond an inner wall of the inner portion 71, while the inner wall is approximately at the same radial height as the radial bottom face 70 closest to the end 64. From the end 59 to the intermediate portion 72, the outer portion 73 converges, that is, narrows radially. Along the X55 axis, the inner part 71 is longer than the outer part 73.The intermediate part 72 forms a rounded fold connecting the inner part 71 to the outer part 73.

[0058] In figures 2 and 3, the joint 52 is illustrated to scale, in particular to show the thicknesses and proportions.

[0059] During use, the belt 53 is designed to be non-stretchable, or only slightly stretchable, to ensure stable and secure retention of the seal 52 in the ring 51, whereas the sleeve 55 and the membrane 54 are designed to be elastically stretchable to adapt to the shape of the cable 1 received through the sleeve 55. To this end, while the seal 52 is uniformly made of a single material, the sleeve 55 and the membrane 54 are thinner than the belt 53 and have no reinforcement, apart from the ribs 66. Conversely, the belt 53 is thicker, for example, three times thicker than the thickest part of the membrane 54. The belt 53 is preferably reinforced by the collar 62 to limit its deformation. The belt 53 is preferentially prevented from deforming by rigid elements of the ring 51, here by the edge 60 retaining the end 59 of the belt 53.While the outer part 73 has a substantially constant thickness, for example, equal to about one-third the thickness of the waistband 53, the middle part 72 is advantageously slightly thicker than the outer part 73, but always thinner than the waistband 53, for example, half as thick. From the middle part 72, the thickness of the inner part 71 decreases until, at the end 64, it reaches the same thickness as the sleeve 55, excluding the ribs 66. The sleeve 55, excluding the ribs 66, is the thinnest part, to be particularly stretchable. For example, excluding the ribs, the sleeve 55 is five times thinner than the waistband 53. For example, the radial thickness of the sleeve 55 is approximately . 0.7 mm. Apart from the ribs 66, the sleeve 55 is advantageously free of excess thickness or local reinforcement.

[0060] Any feature described for an embodiment or variant above may be implemented in the other variants or embodiments described, insofar as technically possible.

Claims

Demands

1. Sealing barrel (5), being configured to be traversed by an electrical cable (1) and comprising a ring (51) and a sealing gasket (52), mounted in the ring (51), the sealing gasket (52) being formed in one piece and comprising a sleeve (55), the sleeve (55) having an internal radial wall (65) centered on a sleeve axis (X55) and being radially extensible with respect to the sleeve axis (X55), so that the internal radial wall (65) conforms to the electrical cable (1), when the electrical cable (1) passes through the sealing barrel (5) via the sleeve (55), the internal radial wall (65) having radial ribs (66), which project radially into the interior of the sleeve (55) to be in contact with the electrical cable (1) when the electrical cable (1) passes through the sealing barrel (5),which are distributed along the sleeve axis (X55) and each surround the sleeve axis (X55) while being centered on the sleeve axis (X55), in which the sealing joint (52) further comprises: • a belt (53), through which the sealing joint (52) is mounted in the ring (51), the belt surrounding the sleeve (55); and • a membrane (54), which connects the belt (53) with the sleeve (55), so that the sealing joint (52) completely closes a radially delimited space between the sleeve (55) and the belt (53), all around the sleeve axis (X55), characterized in that no part of the seal (52) is provided radially between the belt (53) and the sleeve (55), to allow the sleeve (55) to extend radially towards the belt (53) when the seal (52) receives the cable (1).

2. Sealing barrel (5) according to claim 1, wherein each radial rib (66) comprises: • a front axial face (67), which is perpendicular to the handle axis (X55); • a rear axial face (68), which is parallel to the front axial face (67); and • a radial apex face (69), which is parallel to the handle axis (X55) and connects the front axial face (67) to the rear axial face (68) with the same radial rib (66).

3. Sealing barrel (5) according to claim 2, wherein, for each radial rib (66), the following are defined: • a rib length (L69), measured parallel to the handle axis (X55), connecting the rear axial face to the front axial face and measuring between 0.2 and 0.7 mm; and • a rib height (R66), measured radially to the handle axis (X55), connecting the radial top face (69) to a radial bottom face (70), formed by the internal radial wall (65) between two successive radial ribs (66), the rib height (R66) measuring between 0.2 and 0.7 mm.

4. Sealing barrel (5) according to any one of the preceding claims, in which the radial ribs (66) are regularly spaced from each other along the handle axis (X55).

5. Sealing barrel (5) according to any one of the preceding claims, wherein at least three radial ribs (66) are provided.

6. Sealing barrel (5) according to any one of the preceding claims, in which the sleeve (55) comprises a front axial end (64) attached to the membrane (54), through which the sleeve (55) is attached to the belt (53), and a rear axial end (63) left free.

7. Sealing barrel (5) according to claim 6, wherein the membrane (54) comprises: • an intermediate portion (72), which extends all around the sleeve axis (X55), which is radially disposed between the belt (53) and the sleeve (55) and extends axially beyond the belt (53) and the sleeve (55); • an external portion (73), which extends all around the sleeve axis (X55) and connects a front axial end (59) of the belt (53) to the intermediate portion (72); and • an internal portion (71), which extends all around the sleeve axis (X55) and connects the front axial end (64) of the sleeve (55) to the intermediate portion (72), the internal portion (71) having a divergent shape, from the front axial end (64) of the sleeve (55) to the intermediate portion (72).

8. Sealing barrel (5) according to claim 7, wherein the rear axial end (63) and the front axial end (64) of the sleeve (55) are arranged between a rear axial end (58) and the front axial end (59) of the belt (53).

9. Sealing barrel (5) according to any one of the preceding claims, wherein the sleeve (55) and the membrane (54) are thinner than the belt (53) and do not have any reinforcement, apart from the radial ribs (66), so that the sleeve (55) and the membrane (54) are elastically extensible to adapt to the shape of the electrical cable (1) received through the sleeve (55).

10. Assembly comprising the sealing barrel (5) according to any one of the preceding claims and the electrical cable (1), the electrical cable (1) passing through the sealing barrel (5) via the sleeve (55), the sleeve (55) being radially extended by the electrical cable (1), the internal radial wall (65) conforming to the electrical cable (1) and the radial ribs (66) being in contact with the electrical cable (1).

11. Assembly according to claim 10, wherein the electrical cable (1) has a longitudinal rib (14).

12. Electrical device (2), comprising: the sealing barrel (5) according to any one of claims 1 to 9; a housing (3), carrying the sealing barrel ring (51) (5); and an electrical connection means (4), disposed inside the housing (3) and configured to be electrically connected to the electrical cable (1), while the electrical cable (1) passes through the sealing barrel (5).

Images