CN215265008U

CN215265008U - Multicore temperature measurement cable

Info

Publication number: CN215265008U
Application number: CN202121091530.3U
Authority: CN
Inventors: 王文江; 王印斌; 李绪东
Original assignee: SHENYANG PUTAIAN TECHNOLOGY CO LTD
Current assignee: SHENYANG PUTAIAN TECHNOLOGY CO LTD
Priority date: 2021-05-15
Filing date: 2021-05-15
Publication date: 2021-12-21
Anticipated expiration: 2031-05-15

Abstract

An object of the utility model is to provide a multicore temperature measurement cable can accurately judge that the detection cable is mechanical external force damage and causes the short circuit or the conflagration is heated and causes the short circuit, avoids the wrong report fire alarm. A multi-core temperature measuring cable is formed by respectively coating three detection conductors with different or two fusible negative temperature coefficient characteristic plastic layers with the same Vicat softening point, coating one detection conductor coated with the fusible negative temperature coefficient characteristic plastic layer with a shielding conductive layer, twisting the three detection conductors with coating layers together, and coating a sheath layer on the outermost layer.

Description

Multicore temperature measurement cable

Technical Field

The utility model relates to a fire alarm device among the fire detection technical field, a multicore temperature measurement cable.

Background

In the prior art, the following working principles are widely applied to the temperature measuring cable of the fire detector, as shown in fig. 1: a switching linear type temperature-sensing fire detector is composed of a conversion box 8, two elastic detection conductors 1 and 2 which are mutually wound, fusible insulating material barrier layers 3 and 4 arranged between the two elastic detection conductors 1 and 2, an insulating layer 5, an outer sheath layer 6 and a connecting terminal resistor 7 which are sequentially coated outside the fusible insulating material barrier layers. The working principle is as follows: when a fire disaster occurs, the fusible insulating material blocking layers 3 and 4 are melted, the two elastic detection conductors 1 and 2 are in short circuit, and the conversion box 8 judges and outputs a fire alarm signal according to the short circuit signal. The disadvantages are that: the conversion box 8 can not distinguish whether the two elastic detection conductors 1 and 2 are short-circuited due to mechanical external force damage or short-circuited due to heating of a fire, so that a false fire alarm is easily generated, and the linkage fire extinguishing device causes great economic loss.

In view of the foregoing, there is a need for a multi-core temperature measuring cable that overcomes the above-mentioned disadvantages.

Disclosure of Invention

An object of the utility model is to provide a multicore temperature measurement cable can accurately judge that the detection cable is mechanical external force damage and causes the short circuit or the conflagration is heated and causes the short circuit, avoids the wrong report fire alarm.

A multi-core temperature measuring cable is formed by respectively coating three detection conductors with meltable negative temperature coefficient characteristic plastic layers with different Vicat softening points or coating two detection conductors with meltable negative temperature coefficient characteristic plastic layers with the same Vicat softening point and coating the third detection conductor with meltable negative temperature coefficient characteristic plastic layers with different Vicat softening points, then coating one detection conductor coated with the meltable negative temperature coefficient characteristic plastic layer with a shielding conductive layer, twisting the three detection conductors with coating layers together, and coating the outermost layer with an outer sheath layer.

The Vicat softening point of the fusible negative temperature coefficient characteristic plastic insulating layer is between 40 and 300 ℃, and the volume resistivity of the fusible negative temperature coefficient characteristic plastic insulating layer is 10⁶～10¹⁸Omega cm, and the coating thickness is 0.2-1.0 mm.

The utility model discloses a resistance change around operating condition, ambient temperature change and the detection conductor short circuit between the detection conductor can accurate judgement be because of the short circuit that the temperature sensing is heated still mechanical damage causes the short circuit, the utility model discloses a multi-parameter judgement reduces the misstatement rate, improves fire alarm accuracy and reliability.

Drawings

FIG. 1 is a schematic view of a switching value type linear temperature-sensitive fire detector according to the prior art;

FIG. 2 is a schematic structural view of an example of a multi-core temperature measuring cable 1 according to the present invention;

FIG. 3 is a schematic view of a cross-sectional structure of a multi-core temperature measuring cable of example 1 of the present invention;

fig. 4 is a schematic view of a cross-sectional structure of a multi-core temperature measurement cable of example 2 of the present invention.

Detailed Description

The utility model aims at providing a multicore temperature measurement cable, embodiment 1 is shown in fig. 2 and fig. 3, its characterized in that: a first detection conductor 11, a second detection conductor 12, a third detection conductor 13, a fusible negative temperature coefficient characteristic plastic layer, a shielding conductive layer 17 and an outer sheath layer 18; the first detecting conductor 11, the second detecting conductor 12 and the third detecting conductor 13 are respectively coated with the meltable negative temperature coefficient characteristic

plastic layers

14, 16 and 15 with different Vicat softening points or two of the detecting conductors are coated with the meltable negative temperature coefficient characteristic plastic layers with the same Vicat softening point while the other detecting conductor is coated with the meltable negative temperature coefficient characteristic plastic layers with different Vicat softening points, then the first detecting conductor 11 with a coating layer is coated with the shielding conductive layer 17, the three detecting conductors with coating layers are twisted together, and the outermost layer is coated with the outer sheath layer 18.

When a multi-core temperature measuring cable is heated, the resistance between the third detecting conductor 13 and the second detecting conductor 12 is reduced, and is respectively or simultaneously short-circuited with the conducting layer 17, and the resistance between the first detecting conductor 11 and the third detecting conductor 13 is reduced, and an alarm signal is judged to be sent according to the result. When the multi-core temperature measuring cable is at the normal working environment temperature, the first detection conductor 11, the second detection conductor 12 and the third detection conductor 13 are randomly short-circuited to be judged as a fault.

Example 2 is shown in fig. 4, which is characterized in that: the first detecting conductor 11, the second detecting conductor 12 and the third detecting conductor 13 are respectively coated with the meltable negative temperature coefficient characteristic

plastic layers

14, 16 and 15 with different Vicat softening points or coated with the same Vicat softening point and coated with different Vicat softening points, then the first detecting conductor 11 with a coating layer is coated with a shielding conductive layer 17, the three detecting conductors with coating layers are twisted together and then coated with the shielding conductive layer 17, and the outermost is coated with an outer sheath layer 18.

The Vicat softening point of the plastic insulating layer with the fusible negative temperature coefficient characteristics in the embodiment 1 and the embodiment 2 is 40-300 ℃, and the volume resistivity is 10⁶Ω·cm～10¹⁸Omega cm, the coating thickness is between 0.2mm and 1.0 mm; the thickness of the shielding conductive layer 17 is 0.1mm to 0.6mm, and the shielding conductive layer may have a continuous conduction structure or an intermittent conduction structure.

Description of the materials used:

(1) fusible negative temperature coefficient characteristic plastic insulating layer: the Vicat softening point is 40-300 ℃, and the volume resistivity is 10⁶Ω·cm～10¹⁸Omega cm of all plastic, rubber materials. The coating thickness is selected between 0.2mm and 1.0 mm.

(2) And a detection conductor: the material is galvanized steel wire, copper-plated steel wire, galvanized iron wire, alloy copper wire and stainless steel wire. The specification is selected from phi 0.5 mm-1.0 mm.

(3) And a shielding conductive layer: the width of the aluminum-plastic composite belt, the copper-plastic composite belt, the tin belt composite belt, the aluminum belt and the copper belt is 5 mm-20 mm, and the thickness of the aluminum belt and the copper belt is 0.1 mm-0.6 mm.

(4) And outer sheath layer material: PVC, PE, PP, fluoroplastic may be used. The coating thickness is selected from 0.1 mm-2.0 mm.

Claims

1. A multicore temperature measurement cable which characterized in that: a first detection conductor (11), a second detection conductor (12), a third detection conductor (13), a meltable negative temperature coefficient characteristic plastic layer, a shielding conductive layer (17) and an outer sheath layer (18); the first detection conductor (11), the second detection conductor (12) and the third detection conductor (13) are respectively coated with meltable negative temperature coefficient characteristic plastic layers with different Vicat softening points or two detection conductors are coated with meltable negative temperature coefficient characteristic plastic layers with the same Vicat softening point and the other detection conductor is coated with meltable negative temperature coefficient characteristic plastic layers with different Vicat softening points, then the first detection conductor (11) with a coating layer is coated with a shielding conductive layer (17), the three detection conductors with the coating layers are twisted together, and the outermost coating is coated with an outer sheath layer (18).

2. A multicore temperature measurement cable which characterized in that: the first detection conductor (11), the second detection conductor (12) and the third detection conductor (13) are respectively coated with meltable negative temperature coefficient characteristic plastic layers with different Vicat softening points or two detection conductors are coated with meltable negative temperature coefficient characteristic plastic layers with the same Vicat softening point and the other detection conductor is coated with meltable negative temperature coefficient characteristic plastic layers with different Vicat softening points, then the first detection conductor (11) with a coating layer is coated with a shielding conductive layer (17), the three detection conductors with the coating layers are stranded together and then coated with the shielding conductive layer (17), and the outermost is coated with an outer sheath layer (18).