WO2008006250A1

WO2008006250A1 - An analogue line type wire cable of temperature sensing for detecting fire

Info

Publication number: WO2008006250A1
Application number: PCT/CN2006/001606
Authority: WO
Inventors: Weishe Zhang; Gangjin Li
Original assignee: Weishe Zhang; Gangjin Li
Priority date: 2006-07-07
Filing date: 2006-07-07
Publication date: 2008-01-17

Abstract

An analogue line type wire cable of temperature sensing for detecting fire comprises two detecting conductors (5,9) disposed in parallel, and a NTC characteristic intercluding layer (7) and a meltable insulating layer (6) arranged between two detecting conductors (5,9) which are disposed in parallel, and a conducting layer (8) which is connected discontinuously and disposed along the length direction of the wire cable for fire detecting between the NTC characteristic intercluding layer (7) and the meltable insulating layer (6). At least one detecting conductor of two detecting conductors is an elastic conductor.

Description

Analog line type temperature sensing fire detecting cable

The invention relates to an analog quantity line type temperature sensing fire detecting cable, which is provided with a fusible insulating layer and a discontinuous conducting conductive layer between two detecting conductors, at least one detecting The conductor is an elastic conductor, which solves the false alarm caused by the analog line type temperature detector due to the length of the detector and the ambient temperature. Background technique

In the prior art, a relatively advanced fire detection cable includes two probe conductors in parallel, a barrier layer of NTC characteristics and a smeltable insulating layer between the two probe conductors, such as the Chinese patent application of the same applicant. An analog line type temperature sensing cable disclosed in No. 200520121813.2 and No. 200510114820.4.

FIG. 1 shows a relatively advanced analog line type temperature sensing cable in the prior art. As shown in Fig. 1, in the probe cable, there are two detecting conductors 1 and 2 (or thermocouple wires), and the two detecting conductors are connected in parallel, and there is a gap between the two detecting conductors (or thermocouple wires). The NTC-characteristic barrier layer 3 (NTC characteristic refers to a negative temperature coefficient) and a meltable insulating layer 4. When the temperature of the probe cable continues to rise, the molten insulating layer melts or softens when the melting temperature of the meltable insulating layer is reached, and the deformation stress existing in the two detecting conductors eliminates between the two detecting conductors of the heated portion of the detecting cable. The insulation resistance of the fused insulation layer, the detection cable will be converted into a normal NTC analog or CTTC (or FTLD) continuous thermocouple type linear fire detection cable, the resistance (or voltage) between the two parallel conductors The temperature rises and falls (or rises), and the fire alarm is performed according to the magnitude of the change in the resistance (or voltage) or other electrical parameters caused by the change in the resistance (or voltage). When the meltable insulating layer in the probe cable is melted or softened, the deformation stress of the two detecting conductors only eliminates one or more points of the meltable insulating layer between the two detecting conductors of the heated portion of the detecting cable. The insulation resistance, through the contact of these points, the resistance or voltage or other parameter change between the two detecting conductors of the detecting cable which rises with temperature is unstable, so that the alarm cannot be reliably and accurately. An analog line type temperature sensor with a fused insulating layer is insufficient when two detector conductors are heated Turn on, the alarm temperature is not accurate. Therefore, there is a need for an analog line type temperature sensing fire detection cable that overcomes the above disadvantages. Summary of the invention

It is an object of the present invention to provide an analog line type temperature sensing fire detecting cable which is provided with a meltable insulating layer and an NTC between two detecting conductors (or thermocouple wires) arranged in parallel. a characteristic barrier layer, wherein a discontinuous conductive layer is disposed between the meltable insulating layer and the NTC characteristic barrier layer, wherein at least one of the detecting conductors is an elastic conductor, and the melting temperature of the meltable insulating layer is 20 Ό. At 140 ° C, the conductive length of each segment of the intermittent conducting material is 0.05 to 2 m, and the intermittent distance between the conductors of different segments is 0.1 to 10 mm.

The invention provides an analog quantity line type temperature sensing fire detecting cable, comprising: two detecting conductors arranged in parallel, and an NTC characteristic barrier layer and a smelable insulating layer are arranged between two parallel detecting conductors, the characteristics thereof Between the NTC characteristic barrier layer and the meltable insulating layer, a discontinuous conductive layer is disposed along the length direction of the fire detecting cable, wherein at least one of the two detecting conductors is a detecting conductor It is an elastic conductor.

In the analog line type heat-sensitive fire detecting cable of the present invention, the two detecting conductors, the NTC characteristic barrier layer, the fused insulating layer, and the intermittently conducting conductive layer may be parallel to each other Ground setting.

In the analog line type heat-sensing fire detecting cable of the present invention, one of the two detecting conductors is coated with the NTC characteristic barrier layer or the meltable insulating layer, and the intermittent conducting a conductive layer wound on the NTC characteristic barrier layer or the meltable insulating layer, or disposed outside the NTC characteristic barrier layer or the meltable insulating layer, in parallel with the strip detecting conductor or detecting the strip The conductor is coaxial.

In the analog line type heat-sensitive fire detecting cable of the present invention, the two detecting conductors may be disposed in parallel, wound, or coaxially disposed.

Compared with the prior art, the invention has the following advantages: the invention overcomes the shortcoming that the two detecting conductors cannot be fully turned on when the analog line type temperature sensor with the fused insulating layer is heated, and avoids the inaccurate alarm temperature. problem.

BRIEF DESCRIPTION OF THE DRAWINGS 1 is a schematic structural view of a prior art analog line type temperature sensing cable; FIG. 2 is a schematic diagram of an analog line type temperature sensing cable according to an embodiment of the present invention;

3 is a schematic diagram of an analog line type temperature sensing cable according to another embodiment of the present invention;

4 is a schematic diagram of an analog line type temperature sensing cable according to another embodiment of the present invention;

FIG. 5 is a schematic diagram of an analog line type temperature sensing cable according to another embodiment of the present invention; FIG.

Figure 6 is a schematic view showing the winding arrangement of the conductive layer intermittently turned on;

7a, 7b are schematic diagrams showing the parallel conduction of conductive layers in parallel;

8a, 8b are schematic diagrams showing the coaxial arrangement of the electrically conductive layers that are intermittently turned on;

Figure 9 is a schematic view of another analog line type temperature sensing cable according to the present invention; and

Figure 10 is a schematic illustration of a line type thermal fire detector incorporating the analog line type temperature sensing fire detection cable of the present invention. detailed description

The analog line type temperature sensing fire detecting cable of the present invention comprises two detecting conductors arranged in parallel, and an NTC characteristic barrier layer 7 and a smelable insulating layer 6 are disposed between two parallel detecting conductors, which are blocked in the NTC characteristic. A conductive layer 8 intermittently conducting between the layer and the smeltable insulating layer is intermittently turned in the longitudinal direction.

2 shows a schematic diagram of an analog line type temperature sensing cable in accordance with one embodiment of the present invention. Referring to FIG. 2, the analog line type temperature sensing fire detecting cable of the present invention comprises two detecting conductors 9, 5, a NTC characteristic barrier layer 7, a discontinuous conducting conductive layer 8, and a fused insulating layer 6 disposed in parallel. . The NTC characteristic barrier layer 7 and the meltable insulating layer 6 are disposed between the two detecting conductors, and the intermittently conducting conductive layer 8 is disposed between the NTC characteristic barrier layer 7 and the meltable insulating layer 6, and is disposed along the length direction. Intermittent conduction in the length direction. At least one of the two detecting conductors 9 and 5 is an elastic conductor, and the melting temperature of the smelable insulating layer 6 ranges from 20 ° C to 140 ° C, and each of the intermittently conducting conductive layers 8 is The conductive length is 0.05~2m, and the intermittent distance between the conductive segments, That is, the length of the non-conducting is 0.1 to 10 mm.

In the analog line type temperature sensing cable of the present invention, the two detecting conductors are arranged in parallel to mean that the two detecting conductors are arranged side by side, for example, the two detecting conductors can be arranged in parallel, wound, coaxially arranged, and the like. The winding arrangement may include one probe conductor wound on the other probe conductor, or two probe conductors wound around each other.

Fig. 3 shows an embodiment in which two detecting conductors 9, 5 are arranged parallel to each other. In the present embodiment, the two detecting conductors 9, 5 are parallel to each other, and the detecting conductors 9, 5 are along the detecting conductor 9, 5 The NTC-characteristic barrier layer 7 and the melt-permeable insulating layer 6 are provided, and the conductive layer 8 having intermittent conduction is provided between the NTC-characteristic barrier layer 7 and the melt-permeable insulating layer 6 in the longitudinal direction, and is intermittently turned on in the longitudinal direction.

Fig. 4 shows an embodiment in which two detecting conductors 9, 5 are intertwined. As shown in Fig. 4, in the present embodiment, two detecting conductors 9, 5 are intertwined with each other, and one of the two detecting conductors 9, 5, the detecting conductor 9 as shown in the figure, is covered with a NTC characteristic barrier layer. 7. The other detecting conductor, such as the detecting conductor 5, is covered with a meltable insulating layer 6, and the conductive layer 8 which is intermittently turned on is coated on the NTC characteristic barrier layer 7, and is intermittently turned on in the longitudinal direction. It is apparent that the intermittently conductive layer 8 can also be coated on the fused insulating layer 6.

Figure 5 shows an embodiment in which two detector conductors 9, 5 are arranged coaxially. In the present embodiment, the detecting conductor 9 is a core conductor, the detecting conductor 5 is a sleeve conductor, and the sleeve conductor 5 is placed over the core conductor 9 in a coaxial cable structure. In this embodiment, the detecting conductor It may be a hollow wire, a solid wire or a metal fiber braided wire. Obviously, the coaxial setup is also a parallel setup.

In the analog line type temperature sensing cable of the present invention, the NTC characteristic barrier layer and the meltable insulating layer may be combined with the probe conductor by a conventional wire insulation coating or NTC tape wound package. For example, the NTC characteristic barrier layer and the meltable insulating layer may be respectively coated on one of the detecting conductors, that is, one of the two detecting conductors may be coated with a meltable insulating layer, and the other of the detecting conductors may be coated with NTC characteristics. The barrier layer is shown in Figure 4. Alternatively, the NTC characteristic barrier layer, the meltable insulating layer may be sequentially coated on the at least one of the two detecting conductors from the inside to the outside, or at least one of the two detecting conductors may be inwardly directed The outer layer is coated with a meltable insulating layer, a NTC characteristic barrier layer, and the like.

In the present invention, the intermittently conducting conductive layers are disposed in parallel on the NTC characteristic barrier layer and Between the fused insulation layers, the following methods can be used: winding setting, parallel setting, coaxial setting, etc., of course, can also be set in other known manners.

On the outside of the above-mentioned probe conductor which has been covered with a layer of NTC characteristic barrier or a layer of meltable insulation, that is, outside the layer of NTC characteristic barrier or a layer of smable insulating layer.

Fig. 6 schematically shows an embodiment of a discontinuous conductive layer winding arrangement. As shown in Fig. 6, the intermittently conducting conductive layer material is wound around the above-mentioned one layer of the NTC characteristic barrier layer or a layer of the meltable insulating layer. The material of the conductive layer that is intermittently turned on may be a wire, a non-wire, a metal piece, a metal foil tape or the like. The material of the conductive layer that is intermittently turned on may be a pre-conducted conductive material that is intermittently turned on, or may be a continuous conductive material that is wound and then physically (eg, mechanically cut) or chemically processed into a discontinuous guide. The state of the pass. In the present embodiment, the detecting conductor 9 or 5 may be coated with the NTC characteristic barrier layer 7 or the meltable insulating layer 6, and the intermittently conducting conductive layer 8 may be wound around the NTC characteristic barrier layer 7 or the meltable insulating layer 6. . In the present invention, the detecting conductor coated with the NTC characteristic barrier layer 7 or the meltable insulating layer 6 and the electrically conductive layer wound intermittently on the outside under the present embodiment may be wound around another detecting conductor, including They are intertwined, arranged in parallel, coaxially disposed, and a layer of meltable insulating layer 6 or NTC characteristic barrier layer 7 is disposed therebetween to form the analog line type temperature sensing cable of the present invention.

Figures 7a, 7b schematically illustrate an embodiment in which the electrically conductive layers that are intermittently conductive are arranged in parallel. As shown in Figs. 7a, 7b, the material of the conductive layer which is intermittently turned on is disposed in parallel in the longitudinal direction between the NTC characteristic barrier layer and the meltable insulating layer, in parallel with the NTC characteristic barrier layer and the fusible insulating layer. In the present embodiment, the detecting conductor 9 or 5 may be coated with the NTC characteristic barrier layer 7 or the meltable insulating layer 6, and the intermittently conducting conductive layer 8 is disposed along the length direction in the NTC characteristic barrier layer 7 or the meltable insulating layer. 6 is parallel to the probe conductor coated with the NTC characteristic barrier layer 7 or the meltable insulating layer 6. In the present invention, the detecting conductor coated with the NTC-characteristic barrier layer 7 or the smeltable insulating layer 6 and the conductive layer 8 provided with the intermittently-conducting conductive layer 8 in the outer portion of the present embodiment may be wound around the other detecting conductor. This includes the intertwining, parallel arrangement, coaxial arrangement, and the like, and a layer of meltable insulating layer 6 or NTC characteristic barrier layer 7 is disposed between them to form the analog line type temperature sensing cable of the present invention.

In this embodiment, the material of the conductive layer that is intermittently turned on may be a wire or a non-metal. Materials such as silk, metal sheets, metal foil strips, conductive paste or coating layers. For wire or metal sheet or metal foil tape material, the conductive layer material that is intermittently turned on may be a pre-conducted conductive material that is intermittently turned on, or may be a conductive material that is continuously turned on in parallel and then physically used. (such as mechanical cut) or chemical treatment to a state of intermittent conduction. The conductive adhesive or the coating material may be a conductive tape which is intermittently applied or sprayed or immersed outside the NTC characteristic barrier layer 7 or directly formed in the longitudinal direction of the meltable insulating layer 6 in the longitudinal direction. It may also be a state in which the continuously conductive conductive paint or the paint strip is placed in parallel and then physically (e.g., mechanically cut) or chemically treated to be intermittently turned on.

Figures 8a, 8b schematically illustrate an embodiment of a coaxially disposed conductive layer that is intermittently conductive. As shown in Figs. 8a and 8b, the intermittently conducting conductive layer is disposed coaxially with a closed conductive layer outside a layer of the NTC characteristic barrier layer 7 or a layer of the meltable insulating layer 6. In the present embodiment, the detecting conductor 9 or 5 may be coated with the NTC characteristic barrier layer 7 or the meltable insulating layer 6, and the intermittently conducting conductive layer 8 is coated on the NTC characteristic barrier layer 7 in the longitudinal direction or may be melt-insulated. The layer 6 is coaxial with the probe conductor coated with the NTC characteristic barrier layer 7 or the meltable insulating layer 6. In the present invention, the detecting conductor coated with the NTC-based barrier layer 7 or the smeltable insulating layer 6 and the intermittently-conducting conductive layer 8 disposed coaxially outside the embodiment can be wound around another detecting conductor. , including intertwining, parallel arrangement, coaxial arrangement, etc., and further providing a layer of meltable insulating layer 6 or NTC characteristic barrier layer 7 between the detecting conductor of the present embodiment and the other detecting conductor, thereby forming the present invention Analog line type temperature sensing cable.

In this embodiment, the material of the conductive layer that is intermittently turned on may be a wire, a non-metal wire, a metal piece, a metal foil tape, a hollow cylindrical metal sleeve, a conductive paste or a coating material. For wire or non-metal wire or metal sheet or metal foil strip or hollow cylindrical metal sleeve, the material of the conductive layer that is intermittently turned on may be a previously completed intermittent conductive material or a continuously conductive conductive material. After the material is coaxially set, it is treated by physical (such as mechanical cutting) or chemically into a state of intermittent conduction. The conductive adhesive or the coating material may be a conductive strip which is intermittently applied or sprayed or immersed outside the NTC characteristic barrier layer 7 or directly formed in the axial direction outside the meltable insulating layer 6 . It may also be a state in which the continuously conductive conductive paint or the paint strip is placed in parallel and then physically (e.g., mechanically cut) or chemically treated to be intermittently turned on.

In the present invention, the meltable insulating layer is wax, naphthalene, anthracene, stearic acid, crystal rose One of the materials, or one of polyvinyl chloride, polyethylene, natural rubber, neoprene, and nitrile rubber. The thickness of the meltable insulating layer can be selected between 0.05 and 10 mm. The NTC characteristic barrier layer (negative temperature coefficient characteristic barrier layer) is made of one of a polymer material mainly composed of polyacetylene, polyaniline, polythiophene, and polyfluorene, and the barrier layer may have a thickness of 0.1 mm. ~ 5 mm range is selected. When the probe cable is heated, its temperature rises. When the temperature does not reach the softened (or melted) temperature region of the meltable insulating layer, the two probe conductors are insulated; when the probe cable is heated, the temperature continues. Raising, when the melting temperature of the meltable insulating layer is reached, the meltable insulating layer is melted or softened, and the deformation stress existing in the two detecting conductors eliminates one of the detecting conductors and the discontinuous guide at one or more points in the heated portion of the detecting cable. The insulation resistance of the meltable insulating layer between the corresponding conductive segments of the conductive layer, the normal NTC of the probe conductor being converted into a local region by the corresponding conductive segment of the intermittently conducting conductive layer and the other detecting conductor Analog line type temperature sensing fire detection cable, the other two detector conductors are still insulated, and the resistance between the two parallel conductors only decreases with the increase of the heating temperature of the conduction section, according to the resistance or The fire alarm is performed by the magnitude of the change in other electrical parameters caused by the change in resistance.

In the analog line type temperature sensing cable of the present invention, the conductor and the insulator are opposite conductors and opposite insulators, and the conductor and the ratio of the resistivity of the insulator to the resistivity of the conductor at a normal temperature are greater than 10 ⁸ to define the conductor and the conductor. The difference between insulators.

In the analog line type temperature sensing cable of the present invention, at least one of the two parallel detecting conductors may adopt a thermocouple wire, and the voltage (or potential) measured between the two parallel detecting conductors is only heated by the conductive segment. The temperature rises and the fire alarm is given according to the magnitude (or potential) of the voltage or the rate of change.

Fig. 9 shows another embodiment of the analog line type temperature sensing cable of the present invention. As shown in FIG. 9, the analog line type temperature sensing cable includes two detecting conductors 13 and 14 disposed in parallel, a NTC characteristic barrier layer 10, a discontinuous conducting conductive layer 15, and a fused insulating layer 11, wherein at least A probe conductor is an elastic conductor. An NTC characteristic barrier layer 10 and a meltable insulating layer 11 are disposed between the two detector conductors 13, 14 disposed in parallel, and the intermittently conducting conductive layer 15 is disposed between the NTC characteristic barrier layer 10 and the meltable insulating layer 11. . In the analog line type temperature sensing cable of the embodiment, the insulating sheath 12 is further covered on the detecting conductors 13 and 14, and the NTC characteristic barrier layer 10 is intermittently turned on. The conductive layer 15, and the fused insulating layer 11, are insulated from the outside. Obviously, for the above embodiments, an insulating sheath can be added in addition to the analog line type temperature sensing cable of the present invention.

Fig. 10 shows a line type temperature sensitive fire detector including the analog line type temperature sensing fire detecting cable of the present invention. As shown in FIG. 10, the analog line type temperature sensing fire detecting cable of the present invention comprises two parallel detecting conductors 16 and 17, an NTC characteristic barrier layer 18, a discontinuous conducting conductive layer 20, and a fused insulating layer 19. , wherein at least one of the detecting conductors is an elastic conductor. Between the two detector conductors 16, 17 disposed in parallel, a NTC characteristic barrier layer 18, a discontinuous conductive layer 20, and a fused insulating layer 19 are disposed. The detecting conductor 16 is covered with a NTC characteristic barrier layer 18, and the detecting conductor 17 is covered with a smable insulating layer 19, and a fused insulating layer 19 is provided with a discontinuous conducting conductive layer 20, and the detecting conductors 16 and 17, NTC characteristics The barrier layer 18, the intermittently conducting conductive layer 20, and the meltable insulating layer 19 are covered with an insulating sheath 21 to insulate it from the outside. The left end of the detecting conductors 16, 17 is connected in series with a terminating resistor 22, the terminating resistor can be between 10 Ω and 100 Ω, and the right end of the two detecting conductors is connected to the resistance signal measuring device 23.

The elastic conductor described in the present invention may be a memory alloy wire or a carbon spring wire. The memory alloy wire may be one of a nickel-titanium memory alloy, a nickel-titanium copper memory alloy, an iron-based memory alloy, and a copper-based memory alloy material. Reverse martensitic phase change memory alloy wire finish temperature A _f design value may be selected within a set 20 ° C~ 140 ° C range.

Claims

Claim

An analog line type temperature sensing fire detecting cable, comprising: two detecting conductors arranged in parallel, wherein an NTC characteristic barrier layer and a meltable insulating layer are disposed between two parallel detecting conductors, wherein Between the NTC characteristic barrier layer and the meltable insulating layer, a discontinuous conductive layer is disposed along the length direction of the fire detecting cable, wherein at least one of the two detecting conductors is Elastic conductor.

The analog-line type temperature-sensing fire detecting cable according to claim 1, wherein the intermittently conducting conductive layer is intermittently turned on in the longitudinal direction.

3. The analog line type temperature sensing fire detecting cable according to claim 1, wherein the two detecting conductors, the NTC characteristic barrier layer, the fused insulating layer, and the intermittent conduction The conductive layers are disposed in parallel with each other.

4. The analog-line type temperature-sensing fire detecting cable according to claim 1, wherein one of the two detecting conductors is coated with the NTC characteristic barrier layer or a fused insulating layer. The intermittent conductive layer is wound around the NTC characteristic barrier layer or the meltable insulating layer.

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

6. The analog line type temperature sensing fire detecting cable according to claim 5, wherein in the two detecting conductor winding arrangements, the two detecting conductors are entangled with each other.

7. The analog line type temperature sensing fire detecting cable according to claim 1, wherein one of the two detecting conductors is coated with the NTC characteristic barrier layer or a fused insulating layer. The discontinuous conducting conductive layer is disposed outside the NTC characteristic barrier layer or the meltable insulating layer in parallel with the strip detecting conductor.

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

9. The analog line type temperature sensing fire detecting cable according to claim 8, wherein in the two detecting conductor winding arrangements, the two detecting conductors are entangled with each other.

The analog-line type temperature-sensing fire detecting cable according to claim 1, wherein one of the two detecting conductors is coated with the NTC characteristic barrier layer or a fused insulating layer. The discontinuous conducting conductive layer is disposed outside the NTC characteristic barrier layer or the meltable insulating layer and is coaxial with the strip detecting conductor.

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

The analog-line type temperature-sensing fire detecting cable according to claim 11, wherein in the two detecting conductor winding arrangements, the two detecting conductors are entangled with each other.

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

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

The analog-line type temperature-sensing fire detecting cable according to claim 14, wherein the memory alloy wire is one selected from the group consisting of a nickel-titanium memory alloy, an iron-based memory alloy, and a copper-based memory alloy material.