CN213211790U

CN213211790U - Fire-resistant cable

Info

Publication number: CN213211790U
Application number: CN202021927528.0U
Authority: CN
Inventors: 不公告发明人
Original assignee: Shenyang Antong Cable Co ltd
Current assignee: Shenyang Antong Cable Co ltd
Priority date: 2020-09-07
Filing date: 2020-09-07
Publication date: 2021-05-14
Anticipated expiration: 2030-09-07

Abstract

The utility model discloses a fire-resistant cable, including conductor, inorganic knitting, ceramic polymer, non-metallic sheath. The inorganic braided fabric is braided on the conductor, the ceramic polymer is coated on the inorganic braided fabric, and the non-metal sheath is coated on the inorganic braided fabric. A plurality of fire resistant cables are combined within a single, grouped sheath to provide multi-phase electrical conduction. The utility model relates to a rationally, production simple process, heat dissipation are excellent, the practicality is strong, can widely popularize in market.

Description

Fire-resistant cable

Technical Field

The utility model relates to a fire resisting cable relates to wire and cable technical field.

Background

At present, the occurrence of electrical fire accidents is on the rising trend year by year, and the threats to the life and property safety of people and the national economic construction are increasing. The increasing number of high-rise buildings, the increasing of organic material decorative materials and the perfection of electrical equipment, and the aggravation of electrical loads, greatly increase the probability and danger of fire. The fire of the electric wire and the cable and the fire delay cause serious fire, which not only occurs domestically but also occurs abroad, and the loss is huge.

In a fire, most cables are difficult to maintain in proper operation when subjected to high temperatures. Even more wiring preparation has not been made in order to maintain operation in a rapidly rising temperature environment (e.g., an environment in which the temperature rises hundreds of degrees per minute). These cables are prone to failure in the event of an emergency in the event of a fire.

Some cables are designed to operate in flames up to 1850 degrees fahrenheit for two hours. However, in the event of a rapid rise in temperature, such cables typically fail within ten minutes even though the temperature never rises above 2000 degrees fahrenheit. One reason for this difference is that these cables have a copper wire sheath and copper conductors that melt. Another reason is that the rapidly rising temperature environment exposes the cable to significant heat flux, sometimes even in excess of 50,000 BTU/sq.ft. -hr. Most cable designs are not able to withstand a rapidly rising temperature environment.

Currently, a stainless steel mineral insulated heating cable designed with a nickel conductor can withstand a rapidly rising temperature environment. As the name implies, mineral insulated heating cables have a compacted mineral, located between a solid conductor and an outer layer of a solid metal tube. Solid conductors as well as mineral insulation and metal tubes make such cables difficult to handle. In addition, due to the mineral insulation, very special tools are required to terminate the connection of such cables. The cable is long and has a high resistance due to the use of nickel conductors. This increased resistance requires an increase in conductor size, which further limits the length, making such cables more expensive and even more difficult to handle. Solid conductors are susceptible to fracture due to metal fatigue when repeatedly bent as required for value maintenance. Finally, the cable is prone to failure during exposure to moisture or water.

Accordingly, there is a need in the industry to address the above-described deficiencies and inadequacies.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a fire-resistant cable, which overcomes the above-mentioned drawbacks of the prior art.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

the utility model relates to a fire-resistant cable, including conductor, inorganic knitting, ceramic polymer, non-metallic sheath. The inorganic braided fabric is braided on the conductor, the ceramic polymer is coated on the inorganic braided fabric, and the non-metal sheath is coated on the inorganic braided fabric.

In another aspect, the invention features a method of using a fire resistant cable. The method comprises the following steps: connecting a cable to a power source, wherein the cable comprises: a conductor, an inorganic braid applied substantially over the conductor, and a ceramic polymer applied substantially over the inorganic braid; connecting at least one conductor to a load, wherein at least a portion of the conductor is in a predetermined environment; conducting current through the cable; the ambient temperature is increased from a temperature of approximately less than 200 degrees fahrenheit to a temperature of at least approximately 2000 degrees fahrenheit.

Other methods, features and advantages of the invention will be or will become apparent to one with skill in the art upon examination of the following figures and detailed description. It is intended that all such additional methods, features and advantages be included within this description, be within the scope of the present description, and be protected by the accompanying claims.

Drawings

Fig. 1 is a cross-sectional view of a first embodiment of the present invention;

fig. 2 is a cross-sectional view of a second embodiment of the present invention;

fig. 3 is a cross-sectional view of a third embodiment of the present invention.

Reference numerals

FIG. 1: fire-resistant cable 1, conductor 2, inorganic braided fabric 3, ceramic polymer 4.

FIG. 2: a fire resistant cable 11, a conductor 12, a ceramic polymer 14, a non-metallic sheath 15.

FIG. 3: fire resistant cable 21, conductor 22, inorganic braid 23, ceramic polymer 24, jacket 25, cable 26, group jacket 27, fire resistant jacket 28.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and the described embodiments are only some embodiments, not all embodiments, of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be noted that the terms "disposed", "applied", "coated" are to be understood in a broad sense unless otherwise specifically stated and limited. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

Fig. 1 is a cross-sectional view of a first embodiment of the fire resistant cable 1 of the present invention. The fire resistant cable 1 includes a conductor 2, an inorganic braid 3 coated around the conductor 2, and a ceramic polymer 4 coated on the inorganic braid 3.

The conductor 2 may be constructed in various ways. The conductor 2 is a single solid wire or a plurality of wires bundled together. As known to those of ordinary skill in the art, stranded wires bundled together are more susceptible to twisting than single solid wires. The conductor 2 may comprise one or more nickel-plated copper wires. As an example, the conductor 2 comprises a 27% nickel conductor containing oxygen-free, high conductivity copper, or solid copper, solid nickel. The conductor 2 is electrically conductive and maintains integrity in high temperature environments (e.g., 2000 degrees fahrenheit).

The inorganic woven fabric 3 includes a variety of possible materials. The inorganic braid 3 is a ceramic braid, a ceramic braid or a high temperature glass braid or tape. The inorganic woven fabric 3 has many useful properties. The inorganic woven fabric 3 is heat-resistant and heat-insulating to protect the conductor 2. When the inorganic braid 3 is combined with the ceramic polymer 4, air pockets (air pockets not shown) may remain. Air is an excellent insulating material and air pockets will contribute to the insulation of the conductor 2. Additionally, as further explained herein, the ceramic polymer 4 will expand when heated. As the ceramic polymer 4 expands, the inorganic braid 3 will expand with the ceramic polymer 4, which serves to protect the integrity of the ceramic polymer 4, limiting cracking. The ceramic polymer 4 loses some of its quality when ceramized and the air pockets help to insulate the conductor 2 from external heat.

The ceramic polymer 4 may be one of many such polymers known to those of ordinary skill in the art. For example, the ceramic polymer 4 is a ceramifiable silicone rubber. One feature of the ceramic polymer 4 is that it is ceramized under heating. For example, the ceramic polymer 4 begins to ceram at a temperature between about 600 degrees fahrenheit and 900 degrees fahrenheit; the ceramic polymer 4 begins to ceram at a temperature below 950 degrees fahrenheit. Ceramic polymer 4 changes from a flexible rubber-like material to a stronger ceramic-like material after it has been cerammed. As the ceramic polymer 4 cerammes, it may expand. If ceramic polymer 4 is heated too quickly to a significant temperature, ceramic polymer 4 may expand too quickly, causing it to crack and reducing its integrity. The inorganic braid 3 acts as a buffer between the conductor 2 and the ceramic polymer 4, allowing differential expansion and minimizing cracking. The conductor 2, the inorganic braid 3 and the ceramic polymer 4 allow the fire resistant cable 1 to be handled more easily than a mineral insulated heating cable.

Fig. 2 is a cross-sectional view of a second embodiment of the fire resistant cable 11 of the present invention. The fire resistant cable 11 includes a conductor 12. Coated around the conductor 12 is an inorganic braid 13. The ceramic polymer 14 is coated on the inorganic braid 13. The fire resistant cable 11 also includes a non-metallic sheath 15 coated over the ceramic polymer 14.

The fire resistant cable 11 is provided with a non-metallic sheath 15 to protect the integrity of the ceramic polymer 14. If ceramic polymer 14 is heated too quickly to a significant temperature, ceramic polymer 14 may expand too quickly, causing it to crack and reducing its integrity. The non-metallic sheath 15 is provided to limit or inhibit expansion of the ceramic polymer 3. By inhibiting the expansion of the ceramic polymer 14, the non-metallic sheath 15 reduces the chance that the ceramic polymer 3 will degrade its integrity by expanding.

The non-metallic sheath 15 is a non-flammable adhesive tape. The non-metallic sheath 15 also has other properties that contribute to the properties of the fire resistant cable 11. The non-metallic sheath 15 may also be an electrically insulating polymer or a thermally insulating polymer. The non-metallic sheath 15 is heat resistant so that the non-metallic sheath maintains its integrity in an environment having a temperature of at least 900 degrees fahrenheit.

Fig. 3 is a cross-sectional view of a fire resistant cable 21 according to a third embodiment of the present invention. The fire resistant cable 21 is a multi-core cable as shown in fig. 2. In fig. 3, there are three separate cables 26, but more or fewer separate cables may be provided. Each individual cable 26 includes a conductor 22. Woven around each conductor 22 is an inorganic braid 23. A ceramic polymer 24 is applied to each of the inorganic braids 23. A grouping sheath 27 applies the cables around the bundle of individual cables 26.

The grouping sheath 27 serves to hold the individual cable bundles 26 together. For example, another inorganic woven fabric may be used on the grouping sheath 27. An adhesive tape industrially used for holding a plurality of cables is used as the grouping sheath 27. A fire-resistant jacket 28 is applied around the grouping jacket 27 to further protect the individual cables 26 from fire-related damage or from damage that may occur mechanically during installation.

The fire resistant cable 21 includes a jacket 25 coated over each ceramic polymer 24. While the grouping jacket 27 can function to inhibit some expansion of the ceramic polymer 24, it has been discussed previously herein, the retaining jacket 25 can provide a more effective limit to this expansion.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. A fire resistant cable, characterized by: comprises a conductor, an inorganic braided fabric, a ceramic polymer and a non-metal sheath; the inorganic braided fabric is braided on the conductor, the ceramic polymer is coated on the inorganic braided fabric, and the non-metal sheath is coated on the inorganic braided fabric.

2. The fire resistant cable of claim 1, wherein: the conductor comprises at least one nickel-plated copper wire.

3. The fire resistant cable of claim 1, wherein: the inorganic woven fabric further includes a wear-resistant woven fabric, a ceramic woven tape, and a high-temperature glass woven fabric.

4. The fire resistant cable of claim 1, wherein: the ceramic polymer is a ceramifiable silicon rubber.

5. The fire resistant cable of claim 4, wherein: the ceramifiable silicone rubber will begin ceramizing at a temperature between 550 degrees fahrenheit and 950 degrees fahrenheit.

6. The fire resistant cable of claim 1, wherein: the non-metallic sheath further comprises an electrically insulating polymer.

7. The fire resistant cable of claim 1, wherein: the non-metallic sheath is heat resistant, thereby maintaining the integrity of the non-metallic sheath up to 900 degrees Fahrenheit.

8. The fire resistant cable of claim 1, wherein: the conductor is electrically conductive and has a melting point of at least 2000 degrees fahrenheit.

9. The fire resistant cable of claim 1, wherein: the conductor is preferably a 27% nickel conductor with oxygen-free, high conductivity copper, or solid copper, solid nickel.