HK1111794A - Analog line-type temperature sensitive fire detection cable - Google Patents

Description

Analog linear temperature-sensing fire detection cable

Technical Field

The invention relates to an analog quantity line type temperature-sensing fire detection cable, which is characterized in that a meltable insulating layer and an intermittently conducted conducting layer are additionally arranged between two detection conductors, wherein at least one detection conductor is an elastic conductor, so that the false alarm of the analog quantity line type temperature-sensing detector caused by the length of the detector and the ambient temperature is solved.

Background

In the prior art, a more advanced fire detection cable includes two detection conductors arranged in parallel, and between the two detection conductors there are a NTC barrier layer and a fusible insulation layer, as disclosed in the applicant's Chinese patent applications No. 200520121813.2 and No. 200510114820.4.

Fig. 1 shows a prior art analog linear temperature-sensing detection cable. As shown in FIG. 1, in the probe cable, there are two probe conductors 1 and 2 (or thermocouple wires) which are arranged in parallel, and between the two probe conductors (or thermocouple wires) there is a barrier layer 3 of NTC character (NTC character means negative temperature coefficient) and a meltable insulation layer 4. When the heating temperature of the detection cable is continuously increased and reaches the melting temperature of the meltable insulating layer, the meltable insulating layer is melted or softened, the deformation stress existing in the two detection conductors eliminates the insulation resistance of the meltable insulating layer between the two detection conductors at the heated part of the detection cable, the detection cable is converted into a common NTC analog quantity or CTTC (or FTLD) continuous thermocouple type linear fire detection cable, the resistance (or voltage) between the two parallel conductors is reduced (or increased) along with the increase of the temperature, and fire alarm is carried out according to the resistance (or voltage) or the variation of other electrical parameters caused by the change of the resistance (or voltage). When the fusible insulating layer in the detection cable is melted or softened, the deformation stress existing in the two detection conductors only eliminates the insulation resistance at one or more local points of the fusible insulating layer between the two detection conductors of the heated part of the detection cable, and the resistance or voltage or other parameters between the two detection conductors of the detection cable with the temperature rise are unstable through the contact of the points, so that the alarm cannot be reliably and accurately given. When the analog quantity linear temperature-sensing detector with the fusible insulating layer is heated, two detection conductors cannot be fully conducted, and the alarm temperature is inaccurate. Therefore, there is a need for an analog line type temperature-sensitive fire detection cable that overcomes the above-mentioned disadvantages.

Disclosure of Invention

The invention aims to provide an analog quantity line type temperature-sensing fire detection cable, which is characterized in that a meltable insulating layer and an NTC characteristic barrier layer are arranged between two parallel detection conductors (or thermocouple wires), and an intermittent conductive layer is further arranged between the meltable insulating layer and the NTC characteristic barrier layer along the longitudinal direction, wherein at least one detection conductor is an elastic conductor, the melting temperature range of the meltable insulating layer is 20-140 ℃, the conductive length of each section of the intermittent conductive material is 0.05-2 m, and the intermittent distance between different sections of conductors is 0.1-10 mm.

The invention provides an analog quantity line type temperature-sensing fire detection cable, comprising: the fire detection cable comprises two parallel detection conductors, wherein an NTC characteristic barrier layer and a fusible insulating layer are arranged between the two parallel detection conductors.

In the analog line type temperature sensing fire detection cable of the present invention, the two detection conductors, the NTC characteristic barrier layer, the meltable insulation layer, and the intermittently conductive layer may be arranged in parallel with each other.

In the analog quantity line type temperature-sensing fire detection cable, one of the two detection conductors is coated with the NTC characteristic barrier layer or the fusible insulating layer, and the intermittently conducted conducting layer is wound on the NTC characteristic barrier layer or the fusible insulating layer or is arranged outside the NTC characteristic barrier layer or the fusible insulating layer and is parallel to the detection conductor or coaxial with the detection conductor.

In the analog line type temperature sensing fire detection cable of the invention, the two detection conductors can be arranged in parallel, wound or coaxially.

Compared with the prior art, the invention has the advantages that the invention overcomes the defect that two detection conductors can not be fully conducted when the analog quantity linear temperature-sensing detector with the meltable insulation layer is heated, and avoids the problem of inaccurate alarm temperature.

Brief description of the drawings

FIG. 1 is a schematic diagram of a prior art analog linear temperature-sensing detection cable;

FIG. 2 is a schematic diagram of an analog linear temperature-sensitive detection cable according to an embodiment of the present invention

FIG. 3 is a schematic diagram of an analog linear temperature-sensitive detection cable according to another embodiment of the present invention;

FIG. 4 is a schematic diagram of an analog linear temperature-sensitive detection cable according to another embodiment of the present invention;

FIG. 5 is a schematic diagram of an analog linear temperature-sensitive detection cable according to another embodiment of the present invention;

fig. 6 is a schematic view of an intermittently conductive layer winding arrangement;

FIGS. 7a and 7b are schematic diagrams showing the parallel arrangement of the conductive layers which are intermittently conducted;

FIGS. 8a and 8b are schematic diagrams of the coaxial arrangement of the conductive layers which are intermittently conducted;

FIG. 9 is a schematic view of an analog linear temperature-sensitive detection cable according to another embodiment of the present invention; and

fig. 10 is a schematic view of a line-type temperature-sensitive fire detector including an analog-quantity line-type temperature-sensitive fire detection cable of the present invention.

Detailed Description

The analog quantity line type temperature-sensing fire detection cable comprises two parallel detection conductors, an NTC characteristic barrier layer 7 and a meltable insulation layer 6 are arranged between the two parallel detection conductors, and a conducting layer 8 which is intermittently conducted is arranged between the NTC characteristic barrier layer and the meltable insulation layer and is intermittently conducted along the longitudinal direction.

Fig. 2 shows a schematic diagram of an analog linear temperature-sensitive detection cable according to an embodiment of the present invention. Referring to fig. 2, the analog line type temperature sensing fire detection cable of the present invention includes two parallel detection conductors 9, 5, an NTC characteristic barrier layer 7, an intermittently conductive layer 8, and a fusible insulation layer 6. The NTC characteristic barrier layer 7 and the meltable insulation layer 6 are arranged between the two detection conductors, and the intermittently-conducting conductive layer 8 is arranged between the NTC characteristic barrier layer 7 and the meltable insulation layer 6, arranged along the length direction, and intermittently conducted in the length direction. At least one of the two detection conductors 9 and 5 is an elastic conductor, the melting temperature range of the meltable insulation layer 6 is 20-140 ℃, the conductive length of each section of the intermittently conducted conductive layer 8 is 0.05-2 m, and the intermittent distance between the conductive sections, namely the non-conductive length is 0.1-10 mm.

In the analog quantity line type temperature sensing detection cable, the parallel arrangement of the two detection conductors means that the two detection conductors are arranged end to end and ground, for example, the two detection conductors can be arranged in parallel, wound, coaxially and the like. The winding arrangement may comprise one detection conductor wound around the other detection conductor, or two detection conductors wound around each other, etc.

Fig. 3 shows an embodiment in which two detection conductors 9, 5 are arranged parallel to each other, in this embodiment, two detection conductors 9, 5 are parallel to each other, an NTC barrier layer 7 and a fusible insulation layer 6 are arranged between the two detection conductors 9, 5 along the detection conductors 9, 5, and a conductive layer 8 intermittently conducting in the length direction is arranged between the NTC barrier layer 7 and the fusible insulation layer 6 and intermittently conducting in the length direction.

Fig. 4 shows an embodiment in which the two detection conductors 9, 5 are intertwined with one another. As shown in fig. 4, in the present embodiment, two detecting conductors 9, 5 are twisted with each other, one of the two detecting conductors 9, 5, as the detecting conductor 9 in the figure, is coated with an NTC characteristic barrier layer 7, the other detecting conductor, as the detecting conductor 5, is coated with a fusible insulating layer 6, and an intermittently conducting conductive layer 8 is coated on the NTC characteristic barrier layer 7 and intermittently conducts in the length direction. Obviously, the conductive layer 8 that is intermittently conductive may also be coated on the meltable insulation layer 6.

Fig. 5 shows an embodiment in which the two detection conductors 9, 5 are arranged coaxially. In the present embodiment, the detecting conductor 9 is a core-shaped conductor, the detecting conductor 5 is a sleeve-shaped conductor, and the sleeve-shaped conductor 5 is disposed on the core-shaped conductor 9 in a coaxial cable structure. Obviously, a coaxial arrangement is also a parallel arrangement.

In the analog quantity linear temperature sensing detection cable, the NTC characteristic barrier layer and the meltable insulation layer can be combined with the detection conductor in a conventional wire insulation layer coating mode or an NTC belt winding and covering mode. For example, the NTC characteristic barrier layer and the fusible insulating layer may be respectively coated on one detecting conductor, that is, one of the two detecting conductors may be coated with the fusible insulating layer, and the other detecting conductor may be coated with the NTC characteristic barrier layer, as shown in fig. 4. The NTC barrier layer and the meltable insulation layer may be sequentially coated on at least one of the two detecting conductors from inside to outside, or the meltable insulation layer and the NTC barrier layer may be sequentially coated on at least one of the two detecting conductors from inside to outside.

In the invention, the intermittently conducted conducting layer is arranged between the NTC characteristic barrier layer and the meltable insulating layer in parallel, and can be arranged in the following modes: a wound arrangement, a parallel arrangement, a coaxial arrangement, etc., although other known arrangements may be used.

The outer surface of the detection conductor which is already coated with an NTC characteristic barrier layer or a meltable insulation layer is positioned outside the NTC characteristic barrier layer or the meltable insulation layer.

Fig. 6 schematically shows an embodiment of an intermittently conducting conductive layer winding arrangement. As shown in fig. 6, the intermittently conductive layer material is wound around the NTC barrier layer or the meltable insulation layer. The conducting layer material for intermittent conduction can be metal wire, non-metal wire, metal sheet, metal foil belt and other materials. The conductive layer material for intermittent conduction may be a conductor material for intermittent conduction prepared in advance, or a conductive material for continuous conduction wound around the conductor material and then treated by physical (such as mechanical cutting) or chemical method to be in an intermittent conduction state. In this embodiment, the detection conductor 9 or 5 may be coated with the NTC characteristic barrier layer 7 or the meltable insulation layer 6, and the intermittently conducting conductive layer 8 may be wound around the NTC characteristic barrier layer 7 or the meltable insulation layer 6. In the present invention, the detecting conductor coated with the NTC characteristic barrier layer 7 or the meltable insulation layer 6 and the intermittently-conducting conductive layer 8 wound outside in this embodiment may be wound around another detecting conductor, including being wound around each other, being arranged in parallel, being coaxially arranged, and having a meltable insulation layer 6 or an NTC characteristic barrier layer 7 arranged therebetween, thereby forming the analog quantity line type temperature sensing detecting cable of the present invention.

Fig. 7a, 7b schematically show an embodiment in which intermittently conducting conductive layers are arranged in parallel. As shown in fig. 7a and 7b, the conductive layer material that indicates intermittent conduction is longitudinally and parallelly disposed between the NTC property barrier layer and the fusible insulation layer, and is parallel to the NTC property barrier layer and the fusible insulation layer. In this embodiment, the detecting conductor 9 or 5 may be coated with the NTC characteristic barrier layer 7 or the meltable insulation layer 6, and the intermittently-conducting conductive layer 8 is disposed outside the NTC characteristic barrier layer 7 or the meltable insulation layer 6 in the length direction in parallel with the detecting conductor coated with the NTC characteristic barrier layer 7 or the meltable insulation layer 6. In the present invention, the detecting conductor coated with the NTC characteristic barrier layer 7 or the meltable insulation layer 6 and the intermittently-conducting conductive layer 8 disposed in parallel outside in this embodiment may be disposed in winding with another detecting conductor, including winding with each other, parallel disposition, coaxial disposition, etc., and a meltable insulation layer 6 or an NTC characteristic barrier layer 7 is disposed therebetween, thereby forming the analog quantity line type temperature sensing detecting cable of the present invention.

In this embodiment, the material of the conducting layer that is intermittently conducted may be a metal wire, a non-metal wire, a metal sheet, a metal foil tape, a conductive adhesive, or a paint layer. For metal wire or metal sheet or metal foil strip material, the conducting layer material for intermittent conduction can be a conductor material for intermittent conduction made in advance, or can be a conducting material for continuous conduction which is disposed in parallel and then treated into an intermittent conduction state by a physical (such as mechanical cutting) or chemical method. The conductive adhesive or paint material may be a conductive tape intermittently applied or sprayed or dipped outside the NTC barrier layer 7 or the meltable insulation layer 6 to form intermittent conduction directly along the longitudinal direction, or may be a conductive paint or paint tape continuously conducted in parallel and then treated into an intermittent conduction state by physical (e.g. mechanical cutting) or chemical means.

Fig. 8a, 8b schematically show an embodiment in which intermittently conducting conductive layers are arranged coaxially. As shown in fig. 8a and 8b, the intermittently conducting conductive layer is provided with a closed conductive layer coaxially with the NTC barrier layer 7 or the meltable insulation layer 6. In this embodiment, the detecting conductor 9 or 5 may be coated with the NTC characteristic barrier layer 7 or the fusible insulation layer 6, and the intermittently conductive layer 8 is coated outside the NTC characteristic barrier layer 7 or the fusible insulation layer 6 along the length direction and is coaxial with the detecting conductor coated with the NTC characteristic barrier layer 7 or the fusible insulation layer 6. In the present invention, the detecting conductor coated with the NTC characteristic barrier layer 7 or the meltable insulation layer 6 and the conductive layer 8 of intermittent conduction coaxially disposed outside in this embodiment may be disposed by winding with another detecting conductor, including mutual winding, parallel disposition, coaxial disposition, etc., and a meltable insulation layer 6 or an NTC characteristic barrier layer 7 is further disposed between the detecting conductor and another detecting conductor in this embodiment, thereby forming the analog quantity line type temperature sensing detecting cable of the present invention.

In this embodiment, the material of the conducting layer that is intermittently conducted may be a metal wire, a non-metal wire, a metal sheet, a metal foil tape, a hollow cylindrical metal sleeve, a conductive adhesive, or a paint. For metal wire or non-metal wire or metal sheet or metal foil belt or hollow cylindrical metal sleeve, the conducting layer material for intermittent conduction can be a conductor material for intermittent conduction made in advance, or can be a conducting material for continuous conduction which is coaxially arranged and then treated into an intermittent conduction state by a physical (such as mechanical cutting) or chemical method. The conductive adhesive or paint material may be a conductive tape intermittently applied or sprayed or dipped outside the NTC barrier layer 7 or the meltable insulation layer 6 to form intermittent conduction directly along the axial direction, or may be a conductive paint or paint tape continuously conducted in parallel and then treated into an intermittent conduction state by physical (e.g. mechanical cutting) or chemical means.

In the invention, the meltable insulation layer is one of wax, naphthalene, anthracene, stearic acid and crystalline rose materials, or one of polyvinyl chloride, polyethylene, natural rubber, chloroprene rubber and nitrile rubber materials. The thickness of the meltable insulation layer may be chosen between 0.05 and 10 mm. The NTC characteristic barrier layer (negative temperature coefficient characteristic barrier layer) is made of one of high polymer materials with polyacetylene, polyaniline, polythiophene and polyphtalocyanine as main conductive substances, and the thickness of the barrier layer can be selected within the range of 0.1-5 mm. When the detection cable is heated, the temperature of the detection cable rises, and when the temperature does not reach the softening (or melting) temperature region of the meltable insulation layer, the two detection conductors are insulated; when the heating temperature of the detection cable is continuously increased and reaches the melting temperature of the meltable insulating layer, the meltable insulating layer is melted or softened, the deformation stress existing in the two detection conductors eliminates the insulation resistance of the meltable insulating layer between one detection conductor at one or more local points of the heated part of the detection cable and the corresponding conduction section of the intermittently conducted conducting layer, the detection conductor is converted into a common NTC analog quantity linear type temperature-sensing fire detection cable in a local area through the space between the corresponding conducting section of the intermittently conducted conducting layer and the other detection conductor, the two detection conductors at other parts are still insulated, the resistance between the two parallel conductors is only reduced along with the increase of the heating temperature of the current conduction section, and fire alarm is carried out according to the resistance or the variation of other electrical parameters caused by the resistance change.

In the analog quantity line type temperature-sensing detection cable, the conductor and the insulator are opposite conductor and opposite insulator, and the ratio of the resistivity of the insulator to the resistivity of the conductor at normal temperature can be more than 10⁸To define the difference between conductors and insulators.

In the analog quantity line type temperature sensing detection cable, at least one of two parallel detection conductors can adopt a thermocouple wire, the voltage (or potential) measured between the two parallel detection conductors is only increased along with the increase of the heating temperature of the conduction section, and fire alarm is carried out according to the voltage (or potential) or the change rate.

Fig. 9 shows another embodiment of the analog line-type temperature-sensitive detection cable of the present invention. As shown in fig. 9, the analog line type temperature sensing probe cable includes two parallel probe conductors 13 and 14, an NTC barrier layer 10, an intermittently conducting conductive layer 15, and a fusible insulation layer 11, wherein at least one of the probe conductors is an elastic conductor. An NTC barrier layer 10 and a fusible insulation layer 11 are provided between two parallel detection conductors 13, 14, and an intermittently conducting conductive layer 15 is provided between the NTC barrier layer 10 and the fusible insulation layer 11. In the analog quantity line type temperature sensing detection cable of the present embodiment, an insulation sheath 12 is further included to cover the detection conductors 13 and 14, the NTC characteristic barrier layer 10, the intermittently conducting conductive layer 15, and the fusible insulation layer 11, so as to insulate them from the outside. It is obvious that for the above embodiments, an insulating sheath can be added in addition to the analog line-type temperature-sensing detection cable of the present invention.

Fig. 10 illustrates a line-type temperature-sensitive fire detector including an analog-quantity line-type temperature-sensitive fire detection cable of the present invention. As shown in fig. 10, the analog line type temperature-sensitive fire detection cable of the present invention includes two parallel detection conductors 16 and 17, an NTC characteristic barrier layer 18, an intermittently conducting conductive layer 20, and a fusible insulation layer 19, wherein at least one of the detection conductors is an elastic conductor. An NTC barrier layer 18, an intermittently conducting conductive layer 20 and a fusible insulating layer 19 are provided between two parallel detecting conductors 16, 17. The detecting conductor 16 is coated with an NTC characteristic barrier layer 18, the detecting conductor 17 is coated with a meltable insulation layer 19, an intermittently-communicated conductive layer 20 is arranged outside the meltable insulation layer 19, and the detecting conductors 16 and 17, the NTC characteristic barrier layer 18, the intermittently-communicated conductive layer 20 and the meltable insulation layer 19 are coated with an insulation sheath 21 to be insulated from the outside. The left ends of the detecting conductors 16 and 17 are connected in series with a terminal resistor 22, the value of the terminal resistor can be 10-100M omega, and the right ends of the two detecting conductors are connected with a resistance signal measuring device 23.

The elastic conductor can adopt memory alloy wires or carbon spring steel wires. The memory alloy wire can be one of nickel-titanium memory alloy, nickel-titanium-copper memory alloy, iron-based memory alloy and copper-based memory alloy materials. Martensite reverse phase transformation end temperature A of memory alloy wire_fThe design value of (C) can be selectively set in the range of 20 ℃ to 140 ℃.

Claims (15)

1. An analog line type temperature-sensitive fire detection cable comprising: the fire detection cable comprises two parallel detection conductors, wherein an NTC characteristic barrier layer and a fusible insulating layer are arranged between the two parallel detection conductors.

2. The analog line-type temperature-sensitive fire detection cable according to claim 1, wherein: the conductive layer that is intermittently conducted in the longitudinal direction.

3. The analog line type temperature-sensitive fire detection cable according to claim 1, wherein the two detection conductors, the NTC characteristic barrier layer, the meltable insulation layer, and the intermittently conductive layer are disposed in parallel with each other.

4. The analog line type temperature-sensitive fire detection cable according to claim 1, wherein one of the two detection conductors is coated with the NTC characteristic barrier layer or the fusible insulating layer, and the intermittently conducting conductive layer is wound around the NTC characteristic barrier layer or the fusible insulating layer.

5. The analog line-type temperature-sensitive fire detection cable according to claim 4, wherein the one of the two detection conductors is disposed in parallel, wound, or coaxial with the other detection conductor.

6. The analog line type temperature-sensitive fire detection cable according to claim 5, wherein the two detection conductors are wound around each other in the two detection conductor winding arrangement.

7. The analog line type temperature-sensitive fire detection cable according to claim 1, wherein one of the two detection conductors is coated with the NTC characteristic barrier layer or the fusible insulation layer, and the intermittently conducting conductive layer is disposed outside the NTC characteristic barrier layer or the fusible insulation layer in parallel with the one detection conductor.

8. The analog line-type temperature-sensitive fire detection cable according to claim 7, wherein the one of the two detection conductors is disposed in parallel, wound, or coaxial with the other detection conductor.

9. The analog line type temperature-sensitive fire detection cable according to claim 8, wherein the two detection conductors are wound around each other in the two detection conductor winding arrangement.

10. The analog line type temperature-sensitive fire detection cable according to claim 1, wherein one of the two detection conductors is coated with the NTC characteristic barrier layer or the fusible insulation layer, and the intermittently conducting conductive layer is disposed outside the NTC characteristic barrier layer or the fusible insulation layer coaxially with the one detection conductor.

11. The analog line-type temperature-sensitive fire detection cable according to claim 10, wherein the one of the two detection conductors is disposed in parallel, wound, or coaxial with the other detection conductor.

12. The analog line type temperature-sensitive fire detection cable according to claim 11, wherein the two detection conductors are wound around each other in the two detection conductor winding arrangement.

13. The analog line-type temperature-sensitive fire detection cable according to any one of claims 1 to 12, wherein at least one of the two detection conductors is a thermocouple wire.

14. The analog line type temperature-sensitive fire detection cable according to any one of claims 1 to 12, wherein at least one of the two detection conductors is a memory alloy wire or a carbon spring steel wire.

15. The analog line type temperature-sensitive fire detection cable of claim 14, wherein the memory alloy wire is selected from one of a nickel-titanium memory alloy, an iron-based memory alloy, and a copper-based memory alloy material.