Fire-resistant cable for rail transit

Abstract

The utility model relates to the technical field of cables, and discloses a fire-resistant cable for rail transit, which comprises a conductor, an insulating layer is extruded on the outer surface of the conductor, a silicone rubber sleeve is uniformly sleeved on the outer surface of the insulating layer, a silicone rubber frame is integrally formed at the middle position of the silicone rubber sleeve, and the silicone rubber frame is provided with a cable core. Filler is filled between the silicone rubber frame and the silicone rubber sleeve, a mica wrapping layer is wrapped on the outer surface of the silicone rubber sleeve, a metal armor layer is arranged on the outer surface of the mica wrapping layer, and a halogen-free sheath is extruded on the outer surface of the metal armor layer. According to the utility model, through the arrangement of the silicone rubber sleeve and the silicone rubber frame, each conductor can be isolated and protected, the filler is easier to fill and is not easy to fall off, the uniformity can be well ensured, the conductor is well protected, and through the arrangement of the interference fit and the convex ring, the conductor can be prevented from falling off. And the silicone rubber sleeves are connected more tightly.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a fire-resistant cable for rail transportation. Background Art

[0002] Fire-resistant cable for rail transit is a flame-retardant cable with a flame retardant grade of B1. It belongs to the category of medium and high voltage cables. It is made of environmentally friendly materials and does not contain harmful substances such as halogens. Therefore, it will not release toxic gases when burned and is harmless to the environment.

[0003] Under the existing technology, fire-resistant cables for rail transit are generally filled with fillers. There are many types of fillers, all of which are intended to reduce the gaps between conductors and provide certain support and fixation, while also providing good insulation and high temperature resistance. However, there are certain problems with the filling of fillers today. It is difficult to ensure the uniformity of the filling, and it is easy for the filler to fall off during wrapping.

[0004] Therefore, we propose a fire-resistant cable for rail transit that can improve the filling uniformity of the filler and reduce the filling gap to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a fire-resistant cable for rail transit to solve the problems raised in the above background technology.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A fire-resistant cable for rail transit, comprising a conductor, an insulating layer extruded on the outer surface of the conductor, a silicone rubber sleeve uniformly sheathed on the outer surface of the insulating layer, a silicone rubber frame integrally formed at the middle position of the silicone rubber sleeve, a filler filled between the silicone rubber frame and the silicone rubber sleeve, a mica sheath wrapped on the outer surface of the silicone rubber sleeve, a metal armor layer provided on the outer surface of the mica sheath, and a halogen-free sheath extruded on the outer surface of the metal armor layer.

[0008] As a further solution of the utility model: three through cavities are formed between the silicone rubber sleeve and the silicone rubber frame, and the through cavities wrap the insulating layer.

[0009] As a further solution of the utility model: a convex ring is uniformly and integrally formed on the outer surface of the silicone rubber sleeve, and the cross-sectional shape of the convex ring is semicircular.

[0010] As a further solution of the utility model: the convex rings are distributed at equal intervals on the outer surface of the silicone rubber sleeve.

[0011] As a further solution of the utility model: baffles are provided at both ends of the silicone rubber frame.

[0012] As a further solution of the utility model: a clamping hole is opened at the middle position of one side of the silicone rubber frame, and a clamping rod is fixedly connected to the middle position of the other side of the silicone rubber frame.

[0013] As a further solution of the utility model: the shapes of the clamping hole and the clamping rod are both truncated cone-shaped, and the clamping rod and the clamping hole are interference fit.

[0014] Beneficial effects of the utility model:

[0015] 1. A fire-resistant cable for rail transit in the utility model is convenient for isolating each conductor in a cavity between a silicone rubber frame and a silicone rubber sleeve by putting a silicone rubber sleeve on the conductor. At this time, one side of the cavity is closed by a baffle, and then a filler is filled in the other side. At this time, the filler is easier to fill and not easy to fall off, and can well ensure uniformity, thereby providing good protection for the conductor.

[0016] 2. A fire-resistant cable for rail transit in the utility model forms a connection between two silicone rubber sleeves by pulling two silicone rubber sleeves so that the clamping rod is interference-fitted into the clamping hole. When the mica wrapping layer is subsequently wrapped, the mica wrapping layer can be more closely attached to the outer surface of the silicone rubber sleeve due to the setting of the convex ring, and the connection of the silicone rubber sleeve is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0019] Figure 2 It is a schematic diagram of the side planar structure of the utility model.

[0020] Figure 3 It is a bottom-up stereoscopic structural schematic diagram of the silicone rubber sleeve of the utility model.

[0021] Figure 4 It is a top view of the three-dimensional structure of the silicone rubber sleeve of the utility model.

[0022] Figure 5 The utility model is a schematic diagram of the explosion structure of the silicone rubber sleeve, filler and baffle.

[0023] In the figure: 1. conductor; 2. insulation layer; 3. silicone rubber sleeve; 4. mica winding layer; 5. metal armor layer; 6. halogen-free sheath; 7. baffle; 8. clamping hole; 9. convex ring; 10. silicone rubber frame; 11. clamping rod; 12. filler. DETAILED DESCRIPTION

[0024] The technical solution of the utility model will be described clearly and completely in conjunction with the embodiments below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] like Figure 1-Figure 5 In this embodiment, a fire-resistant cable for rail transit includes a conductor 1, an insulating layer 2 is extruded on the outer surface of the conductor 1, a silicone rubber sleeve 3 is evenly covered on the outer surface of the insulating layer 2, a silicone rubber frame 10 is integrally formed at the middle position of the silicone rubber sleeve 3, a filler 12 is filled between the silicone rubber frame 10 and the silicone rubber sleeve 3, a mica sheath 4 is wrapped around the outer surface of the silicone rubber sleeve 3, a metal armor layer 5 is arranged on the outer surface of the mica sheath 4, and a halogen-free sheath 6 is extruded on the outer surface of the metal armor layer 5.

[0026] like Figure 1-Figure 5 In this embodiment, three through cavities are formed between the silicone rubber sleeve 3 and the silicone rubber frame 10, and the through cavities wrap the insulating layer 2, so as to facilitate the isolation and wrapping of each conductor 1 to avoid mutual interference.

[0027] like Figure 1-Figure 5 The outer surface of the silicone rubber sleeve 3 in this embodiment is uniformly and integrally formed with a convex ring 9, and the cross-sectional shape of the convex ring 9 is semicircular. Due to the setting of the convex ring 9, the mica wrapping layer 4 fits more closely to the outer surface of the silicone rubber sleeve 3, and the connection of the silicone rubber sleeve 3 is more stable.

[0028] like Figure 3-Figure 5 The convex rings 9 in this embodiment are evenly spaced on the outer surface of the silicone rubber sleeve 3, which brings convenience to production and ensures normal wrapping.

[0029] like Figure 1 , Figure 2 and Figure 5 In this embodiment, baffles 7 are provided at both ends of the silicone rubber frame 10 to facilitate blocking of one side, thereby ensuring good filling of the filler 12 .

[0030] like Figure 2-Figure 4 In this embodiment, a clamping hole 8 is opened in the middle position of one side of the silicone rubber frame 10, and a clamping rod 11 is fixedly connected to the middle position of the other side of the silicone rubber frame 10. The clamping rod 11 is clamped into the inside of the clamping hole 8 to facilitate the connection of the two silicone rubber sleeves 3.

[0031] like Figure 3 and Figure 4 In this embodiment, the shapes of the clamping hole 8 and the clamping rod 11 are both truncated cone-shaped, and the clamping rod 11 and the clamping hole 8 are interference fit, thereby ensuring the stability of the connection between the two silicone rubber sleeves 3.

[0032] It can be understood that the fire-resistant cable for rail transit can isolate and protect each conductor 1 through the setting of the silicone rubber sleeve 3 and the silicone rubber frame 10, and at the same time make the filler 12 easier to fill and not easy to fall off, and can well ensure uniformity, thereby providing good protection for the conductor 1. At the same time, the connection between the silicone rubber sleeves 3 can be made tighter through the setting of interference fit and the convex ring 9.

[0033] The complete usage steps and working principle of the utility model are as follows:

[0034] After the insulating layer 2 is extruded on the surface of the conductor 1 and cooled and formed, the three conductors 1 are pulled and transported. During this process, all the silicone rubber sleeves 3 are manually put on the conductors 1, so that each conductor 1 is respectively located inside the through cavity between the silicone rubber frame 10 and the silicone rubber sleeve 3. At this time, one side of the through cavity is closed by the baffle 7, and then the filler 12 is added on the other side. At this time, the filler 12 is easier to be filled and can well ensure uniformity, which plays a good protective role on the conductor 1;

[0035] When one silicone rubber sleeve 3 is filled, it can be sealed by the baffle 7, and then the two silicone rubber sleeves 3 are pulled so that the clamping rod 11 is interference fit into the clamping hole 8, thereby forming a connection between the two silicone rubber sleeves 3. When the mica wrapping layer 4 is subsequently wrapped, due to the setting of the convex ring 9, the mica wrapping layer 4 can be more closely attached to the outer surface of the silicone rubber sleeve 3, and the connection of the silicone rubber sleeve 3 can be more stable.

[0036] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A fire-resistant cable for rail transit, comprising a conductor (1), characterized in that: An insulating layer (2) is extruded on the outer surface of the conductor (1), a silicone rubber sleeve (3) is evenly covered on the outer surface of the insulating layer (2), a silicone rubber frame (10) is integrally formed at the middle position of the silicone rubber sleeve (3), a filler (12) is filled between the silicone rubber frame (10) and the silicone rubber sleeve (3), a mica sheath (4) is wrapped around the outer surface of the silicone rubber sleeve (3), a metal armor layer (5) is provided on the outer surface of the mica sheath (4), and a halogen-free sheath (6) is extruded on the outer surface of the metal armor layer (5).

2. A fire-resistant cable for rail transit according to claim 1, characterized in that: Three through cavities are formed between the silicone rubber sleeve (3) and the silicone rubber frame (10), and the through cavities wrap the insulating layer (2).

3. A fire-resistant cable for rail transit according to claim 1, characterized in that: A convex ring (9) is uniformly and integrally formed on the outer surface of the silicone rubber sleeve (3); the cross-sectional shape of the convex ring (9) is semicircular.

4. A fire-resistant cable for rail transit according to claim 3, characterized in that: The convex rings (9) are distributed at equal intervals on the outer surface of the silicone rubber sleeve (3).

5. A fire-resistant cable for rail transit according to claim 1, characterized in that: Baffles (7) are provided at both ends of the silicone rubber frame (10).

6. A fire-resistant cable for rail transit according to claim 1, characterized in that: A clamping hole (8) is provided at the middle position of one side of the silicone rubber frame (10), and a clamping rod (11) is fixedly connected to the middle position of the other side of the silicone rubber frame (10).

7. A fire-resistant cable for rail transit according to claim 6, characterized in that: The clamping hole (8) and the clamping rod (11) are both truncated cone-shaped, and the clamping rod (11) and the clamping hole (8) are interference fit.

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