WO2020119442A1

WO2020119442A1 - Flexible fire-resistant frequency conversion power cable

Info

Publication number: WO2020119442A1
Application number: PCT/CN2019/120885
Authority: WO
Inventors: 魏辰冰; 张锐; 闫俊桥; 刘焱鑫; 刘秋生; 代子阳; 刘坤瑜; 王思元; 卢柏会
Original assignee: 江苏中利集团股份有限公司; 宁夏中盛电缆技术有限公司
Priority date: 2018-12-11
Filing date: 2019-11-26
Publication date: 2020-06-18
Also published as: DE212019000139U1; CN209343843U

Abstract

A flexible fire-resistant frequency conversion power cable, comprising a cable core. The cable core comprises three main wire cores and three ground wire cores. The main wire cores are arranged together, and the ground wire cores are disposed between the main wire cores. A first cladding layer (5), a braided layer (6), and a sheath layer (8) are sequentially provided outside the cable core. The first cladding layer (5) is formed by lap wrapping with a highly flame-retardant tape. Each main wire core comprises a fifth type of conductor (1). The fifth type of conductor (1) is wrapped with a mica tape (2), and the mica tape (2) is surrounded by an insulating layer (3). According to the cable, the conductor is wrapped with a mica tape (2) having excellent performance, so as to satisfy the Australian standard AS/NZS 3013 fire-resistance requirements (1050℃). Moreover, the conductor is designed to be a fifth type of conductor (1), and the design of an inner lining structure is changed from an extrusion type to lap wrapping with a highly flame-retardant tape, and the overall structure is designed to be relatively soft, thereby facilitating actual installation.

Description

A flexible fire-resistant frequency conversion power cable

Technical field

The utility model relates to a frequency conversion power cable, in particular to a flexible fire-resistant frequency conversion power cable, which belongs to the technical field of cable manufacturing.

Background technique

With the increasing popularity of variable frequency motors for engineering projects around the world, the demand for supporting variable frequency cables is also increasing. This type of cable is generally a conventional variable frequency power cable designed by various manufacturers. It is generally a 3+3 core structure with a total shielding structure. It can well prevent electromagnetic interference and has good shielding effect.

The frequency conversion cables on the market are uneven, with different performance indicators, and some of them have fire resistance requirements. For frequency conversion cables with fire resistance requirements, the fire resistance level of the products on the market is relatively low, generally only meets the fire resistance requirements of the national standard, ie IEC 60331-11/IEC 60331-21 fire resistance requirements (750℃), such as the authorized announcement number CN102610317B Frequency conversion cable, which has a cable core in the middle, the cable core includes three main insulated cores and three zero cores, and an optical unit is provided in the middle of the cable core or the gap between the main insulated core and the zero core, and the cable core is sequentially arranged outside Metal shielding layer, longitudinally clad aluminum-plastic composite layer, isolation sleeve, armor layer and outer sheath, the cable enhances the functions of conventional frequency conversion cable, making it have functions such as alarm, temperature measurement, status monitoring, frequency feedback, signal transmission, etc. , But the fire resistance level is relatively low.

At present, there are few Australian standard refractory products (temperature class 1050℃) that meet the requirements of higher indexes. Designing the cable to be flexible is easy to lay, while meeting the Australian standard fire-resistant and flexible cable design is even more difficult to achieve.

Utility model content

The purpose of the utility model is to provide a flexible fire-resistant frequency conversion power cable, which meets the requirements of Australian standard fire resistance and flexibility.

In order to achieve the above technical purpose, the technical solution of the present utility model is:

A flexible fire-resistant variable-frequency power cable includes a cable core. The cable core includes three main cores and three ground cores. The main cores are arranged together. The ground cores are arranged between the main cores. A first cladding layer, a braided layer, and a sheath layer are sequentially arranged outside the cable core. The first cladding layer is formed by wrapping a high-flame-retardant cladding tape; the main wire core includes five types of conductors. The five types of conductors are wrapped around with mica tape, and the mica tape is covered with an insulating layer.

The covering rate of the mica tape around the package is 50%, which ensures fire resistance (AS/NZS3013 fire resistance requirements). Preferably, the mica tape has two layers.

In order to further improve the fire resistance performance, a second wrapping tape layer is provided between the braided layer and the sheath layer, and the second wrapping tape layer is formed by wrapping a high-flame-retardant wrapping tape.

In order to make the cable structure round, an extrusion filling strip is provided between the main wire cores.

The cable of the utility model has excellent mica tape wrapped around the conductor, which can meet the Australian standard AS/NZS 3013 fire resistance requirement (1050℃), meanwhile, the conductor is designed into five types of conductors, and the inner lining structure is designed by extrusion The model is changed to use high flame retardant straps to wrap around the bag, and the overall structure design is relatively soft, which is convenient for actual installation.

BRIEF DESCRIPTION

Figure 1 is a schematic diagram of the utility model.

detailed description

The utility model will be described in further detail below with reference to the drawings and specific embodiments.

As shown in FIG. 1, a flexible fire-resistant variable frequency power cable includes a cable core, a first clad layer 5, a braided layer 6, a second clad layer 7, and a jacket layer 8 from inside to outside.

The cable core includes three main wire cores and three ground wire cores, the main wire cores are arranged together, and the ground wire cores are arranged between the main wire cores. In order to round the cable structure, an extrusion filling strip 4 is provided between the main cores. The main wire core includes five types of conductors 1. The five types of conductors 1 are surrounded by a mica tape 2, and the mica tape 2 is an insulating layer 3. The mica tape 2 is composed of two layers, and the covering rate of each layer of mica tape 2 is 50%, which ensures the fire resistance performance (AS/NZS 3013 fire resistance requirements). The structure of the ground wire core adopts the structure in the prior art.

The first wrapping tape layer 5 and the second wrapping tape layer 7 are made of high-flame-retardant wrapping tape and wrapped around the cover. The highly flame-retardant wrapping tape can be a halogen-free, low-smoke, high-flame retardant fire and oxygen-proof glass cloth wrapping tape disclosed by the public number CN207367661U, or it can also use the wire and cable flame retardant wrapping package sold by Suzhou Taifang Cable Material Co., Ltd. band.

The structures and materials of the braided layer 6 and the sheathed layer 8 all adopt the solutions in the prior art.

The above embodiments do not limit the present invention in any way, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

A flexible fire-resistant variable frequency power cable includes a cable core, the cable core includes three main cores and three ground cores, the main cores are arranged together, the ground cores are arranged between the main cores, The characteristic is that: a first cladding layer (5), a braided layer (6), and a sheath layer (8) are sequentially arranged outside the cable core, and the first cladding layer (5) is made of highly flame-retardant cladding tape The main wire core includes five types of conductors (1), and the mica tape (2) is wrapped around the five types of conductors, and the mica tape (2) is surrounded by an insulating layer (3).
The flexible fire-resistant variable frequency power cable according to claim 1, characterized in that the covering rate of the mica tape (2) is 50%.
The flexible fire-resistant variable-frequency power cable according to claim 1, characterized in that the mica tape (2) has two layers.
A flexible fire-resistant variable frequency power cable according to claim 1, 2 or 3, characterized in that a second tape layer (7) is provided between the braided layer (6) and the sheath layer (8) ), the second tape layer (7) is formed by wrapping a high flame retardant tape with a cover.
The flexible fire-resistant variable frequency power cable according to claim 1, characterized in that an extrusion filling strip (4) is provided between the main wire cores.