CN213183028U

CN213183028U - Cable of linear temperature-sensing fire detector

Info

Publication number: CN213183028U
Application number: CN202020848927.1U
Authority: CN
Inventors: 王印斌; 王文江; 李绪东
Original assignee: SHENYANG PROACTIVE FIRE SYSTEM Ltd
Current assignee: SHENYANG PROACTIVE FIRE SYSTEM Ltd
Priority date: 2020-05-13
Filing date: 2020-05-13
Publication date: 2021-05-11
Anticipated expiration: 2030-05-13

Abstract

The utility model provides a linear temperature sensing fire detector cable, the structure of its characterized in that cable: the two detection conductors are wound with each other, the first one is coated with a meltable insulating material layer, the second one is sequentially coated with an NTC characteristic material layer and a semiconductor material layer from inside to outside, and the two detection conductors with coating layers are wound together and finally coated with an outer sheath layer. The semiconductor material layer is continuously conducted, and at least one of the two detection conductors is an elastic conductor. The outer cladding of the detection conductor adopts an improved continuous conduction semiconductor technology, so that the characteristic of converting switching value characteristic temperature sensing into analog quantity characteristic after being heated is realized, the application technical performance is improved, the structural characteristic defect can be completely detected, and the technical effect is remarkably improved. The problem of prior art because production and processing technology falls behind, structural technology defect can't detect, easily cause the wrong trouble alarm signal that sends when the conflagration takes place is solved.

Description

Cable of linear temperature-sensing fire detector

Technical Field

The utility model relates to a fire detection alarm device, a linear temperature sensing fire detector cable.

Background

An analog quantity line type temperature-sensing fire detector cable in the prior art, application number 200610101726.X, the detector includes: two parallel arrangement's detection conductor is provided with NTC characteristic barrier layer and fusible insulating layer, its characterized in that between two parallel arrangement's detection conductor: and a conductor which is discontinuously conducted is arranged between the NTC characteristic barrier layer and the fusible insulating layer along the length direction of the fire detector cable to form an analog linear temperature-sensing fire detector cable.

Fig. 1 shows an analog quantity line type temperature-sensing fire detector cable, in the detector cable, there are two parallel detecting

conductors

10, 9, there are NTC characteristic barrier layer 7, intermittent conducting conductor 8 and fusible insulating layer 11 between two parallel detecting

conductors

10, 9, when the detector cable is heated, the fusible insulating layer 11 melts or softens, the detecting conductor 10 contacts with intermittent conducting conductor 8 and conducts, the resistance between the detecting

conductor

10, 9 of the detector cable changes with the temperature. And (4) according to the temperature rise of the detector cable, the resistance changes, and fire alarm is carried out according to the change of the electrical parameter. The production manufacturing process of the prior analog quantity line type temperature-sensing fire detector cable is that a conducting layer must be prepared in advance with a conductor material which is conducted intermittently, the conducting length of each section is 0.05-2 m, the intermittent distance between the conducting sections, namely the non-conducting length is 0.1-10 mm, the intermittent conductor material is covered on a wire body to produce a large-length detector cable, and the production process and the product quality are difficult to guarantee; the other production process is that after the continuously conducting material is coaxially arranged, the conducting material is processed into an intermittent conducting state by a physical method (such as mechanical cutting) or a chemical method, the detector cable is coated with continuously conducting conductive paint and is processed into the intermittent conducting state by the physical method (such as mechanical cutting) or the chemical method, and the production process is difficult to ensure the product quality and has extremely low production efficiency.

In summary, the core technology of the analog quantity line type temperature-sensing fire detector cable is that the sampling conducting layer is conducted intermittently, so that the false alarm caused by the service length of the detector cable and the ambient temperature can be solved, and the problem of inaccurate alarm temperature is avoided. The defect is that the conductive layer is in discontinuous conduction, so that short circuit occurs between each conductive layer and the detection conductor of the NTC characteristic barrier layer and between each conductive layer and the detection conductor of the fusible insulating layer due to mechanical damage in the using process, and the defect hidden danger exists because no monitoring means exists and a finished product has no way of detection. In the using process, once a fire disaster happens to the defect part, a fire alarm signal cannot be sent out, so that the fire disaster detection is not timely, and the consequences are serious. The analog linear temperature-sensing fire detector cable in the prior art is not protected by an outer sheath layer, is very easy to corrode, is easy to cause false alarm and affects the service life because the detector cable is used outdoors, in a cable trench and other severe environments. Therefore, there is a need for a line type temperature-sensitive fire detector cable that overcomes the above-mentioned disadvantages.

Disclosure of Invention

The utility model aims at providing a linear temperature sensing fire detector cable, this detector cable realize being heated by switching value characteristic temperature and convert the analog quantity characteristic into after, the analog quantity characteristic is reliable and stable, and detector cable warning precision does not receive service length and rated maximum service environment temperature to influence, and detector cable service length can be more than 5000 meters.

The utility model relates to a line type temperature sensing fire detector cable, the structure of its characterized in that cable: the two detection conductors are wound with each other, the first one is coated with a meltable insulating material layer, the second one is sequentially coated with an NTC characteristic material layer and a semiconductor material layer from inside to outside, and the two detection conductors with coating layers are wound together and finally coated with an outer sheath layer. The semiconductor material layer is continuously conducted, and at least one of the two detection conductors is an elastic conductor.

Compared with the prior art, the utility model has the advantages that: the outer coating layer of the detection conductor adopts a continuous conduction semiconductor technology, the processing technical means is advanced, the production efficiency is high, the processing procedures are reduced, and the energy consumption is reduced. By improving the continuous conduction semiconductor technology, the cable of the detector is converted into analog quantity characteristic after being heated by switching value characteristic temperature sensing, the application technical performance is improved, the structural characteristic defect can be completely detected, and the technical effect is remarkably improved. Can monitor the physical change of detector cable sinle silk structure in real time after connecting alarm device, detector cable takes place the structural change because of non-conflagration reason, can send failure alarm signal, has solved current analog quantity line type temperature sensing fire detector cable, because production and processing technology defect, structural technical defect can't detect, the wrong problem of sending failure alarm signal when easily causing the conflagration to take place.

Drawings

FIG. 1 is a schematic view of a cable structure of a conventional analog line-type temperature-sensitive fire detector;

fig. 2 is a schematic structural diagram of an embodiment of a cable for a linear temperature-sensitive fire detector according to the present invention;

Detailed Description

A cable of a linear temperature-sensitive fire detector is implemented as follows: the detector comprises two

detection conductors

1 and 2 which are mutually wound, wherein a meltable insulating material layer 5 is coated outside the detection conductors 1, the detection conductors 2 are sequentially coated with an NTC characteristic material layer 3 and a semiconductor material layer 4 from inside to outside, and the two detection conductors with coating layers are wound together and finally coated with an outer sheath layer 6.

During manufacturing, the detection conductor 1 is coated with the meltable insulation material layer 5, and the conventional wire and cable coating technology is adopted to coat the meltable insulation material layer 5 outside the detection conductor 1. The detection conductor 2 is coated with the NTC characteristic material layer 3 on the inner layer and the semiconductor material layer 4 on the outer layer, and the NTC characteristic material layer 3 and the semiconductor material layer 4 are coated outside the detection conductor 2 in sequence at one time by adopting the conventional wire and cable double-layer coating technology. And winding the coated root detection conductors together by using a wire twisting machine, and finally coating the outer sheath layer 6 by using a conventional wire and cable coating technology, wherein at least one of the two

detection conductors

1 and 2 is an elastic conductor.

The utility model discloses a linear temperature sensing fire detector cable theory of operation: when the detector cable is heated and reaches the rated alarm temperature of the linear temperature-sensing fire detector cable, the meltable insulation material 5 is softened or melted, the detection conductor 1 cuts off the meltable insulation material 5 under the action of twisting stress, the exposed detection conductor 1 is in contact with the semiconductor material layer 4, the resistance value of the superposed NTC characteristic material layer 3 is reduced by heating, a resistance value mutation reduction signal can be detected, and the signal can be set as a short-circuit fire alarm signal according to the resistance value mutation reduction signal; the detecting conductor 1 is contacted with the semiconductor material layer 4, the resistance value change of the NTC characteristic material layer 3 can be detected in real time, and a plurality of temperature fire alarm signals can be judged according to the resistance value change. When the detector cable is not heated or is lower than the rated alarm temperature of the detector cable, the detection conductor 1 is in contact with the semiconductor material layer 4 due to mechanical damage, but a superposed resistance value sudden change reduction signal is not generated, and the fault signal of the detector cable structure can be judged according to the resistance value reduction.

Claims

1. The utility model provides a linear temperature sensing fire detector cable, the structure of its characterized in that cable: the detector comprises two detection conductors which are mutually wound, wherein a meltable insulating material layer (5) is coated outside one detection conductor, an NTC characteristic material layer (3) and a semiconductor material layer (4) are sequentially coated on the other detection conductor from inside to outside, the two detection conductors with coating layers are wound together and finally coated with an outer sheath layer (6), and at least one of the detection conductors is an elastic conductor.