Switching quantity composite thermocouple linear temperature sensor

Abstract

The utility model provides a switch quantity composite thermocouple line type temperature sensing detector, including signal processor and its with its connection and detection temperature sensing cable, temperature sensing cable includes first metal conductor, a high strength insulating line body, second metal conductor, the layer of fusible insulating material or NTC characteristic fusible insulating material layer and insulating outer sheath, utilize in any stranded pitch of temperature sensing cable when heating one, two short -circuit thermocouple points in each stranded pitch, not only through signal processor can realize detection to the position of temperature sensing cable short -circuit point, can realize detection to the position of temperature sensing cable short -circuit point's temperature value again.

Description

Technical Field

[0001] This utility model belongs to the field of fire detection technology and relates to a switch-type composite thermocouple linear temperature detector. Technical Background

[0002] Chinese Patent No. ZL200620133478.2 discloses a non-recoverable linear heat-sensing fire detector with short-circuit fault alarm. The detector includes a heat-sensing cable, a terminating resistor, and a signal processor. The heat-sensing cable comprises at least two parallel metal conductors and a fusible insulating layer. The heat-sensing cable further includes a semiconductor layer, wherein the semiconductor layer and the fusible insulating layer are disposed between the metal conductors, separating them. Its working principle is that when the heat-sensing cable reaches the melting temperature of the fusible insulating layer, the two metal conductors directly connect to the semiconductor layer under the action of the elastic force of the metal conductors, and the signal unit detects the resistance change and outputs a fire alarm signal. When an external force causes a short circuit between the two metal conductors, a fault signal is output.

[0003] The disadvantage of this technology is that it cannot display the specific temperature value of the heated part, nor can it output the location information of the fire alarm or fault alarm location, which increases the difficulty of maintaining the detector. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a switch-signal composite thermocouple linear temperature detector capable of detecting both the location and temperature value of a short-circuit point in a temperature-sensing cable. The detector includes a signal processor and a temperature-sensing cable connected to and detecting the short circuit. The temperature-sensing cable comprises a first metal conductor, a high-strength insulated wire, a second metal conductor, a fusible insulating material layer or an NTC-characteristic fusible insulating material layer, and an insulating outer sheath. The high-strength insulated wire is arranged parallel to the second metal conductor and then twisted or wound together with the first metal conductor, which is covered with the fusible insulating material layer or the NTC-characteristic fusible insulating material layer. When any twist pitch of the temperature-sensing cable is heated, there is a short-circuit point in each twist pitch, followed by an insulating outer sheath. The first metal conductor and the high-strength insulated wire are elastic wires, and the first and second metal conductors are made of different metal materials.

[0005] Preferably, outside the high-strength insulated wire, a third metal conductor is provided that is symmetrical to the second metal conductor. This third metal conductor is then twisted or wound together with the first metal conductor, which is covered with a fusible insulating material layer or an NTC characteristic fusible insulating material layer. When the temperature-sensing cable is heated at any twist pitch, there is a short-circuit point in each twist pitch, and they are separated by half a pitch.

[0006] This utility model also provides another type of switch-signal composite thermocouple linear temperature detector, including a signal processor and a temperature-sensing cable connected to and detecting the signal. The temperature-sensing cable comprises a first metal conductor, a high-strength insulated wire, a second metal conductor, a fusible insulating material layer or an NTC-characteristic fusible insulating material layer, and an insulating outer sheath. The high-strength insulated wire is arranged parallel to the second metal conductor, then covered with the fusible insulating material layer or the NTC-characteristic fusible insulating material layer, and then twisted or wound together with the first metal conductor. When any twist pitch of the temperature-sensing cable is heated, there is a short-circuit point in each twist pitch, and then it is covered with an insulating outer sheath. The first metal conductor and the high-strength insulated wire are elastic wires, and the first and second metal conductors are made of different metal materials.

[0007] Preferably, outside the high-strength insulated wire, a third metal conductor is provided that is symmetrical to the second metal conductor. This third metal conductor is then twisted or wound together with the first metal conductor, which is covered with a fusible insulating material layer or an NTC characteristic fusible insulating material layer. When the temperature-sensing cable is heated at any twist pitch, there is a short-circuit point in each twist pitch, and they are separated by half a pitch.

[0008] Preferably, the temperature-sensing cable is further provided with a metal shielding layer.

[0009] Preferably, the signal processor is electrically connected to one end of the temperature sensing cable.

[0010] Preferably, the signal processor is electrically connected to one end of the temperature sensing cable.

[0011] Preferably, the signal processor is electrically connected to both ends of the temperature sensing cable.

[0012] Preferably, the signal processor is electrically connected to both ends of the temperature sensing cable.

[0013] This utility model discloses a linear thermocouple temperature sensor with a switching quantity. It utilizes a high-strength insulated wire in a temperature-sensing cable, which is parallel to a second metal conductor and then twisted or wound together with a first metal conductor covered with a fusible insulating material layer or an NTC-characteristic fusible insulating material layer. When any twist pitch of the temperature-sensing cable is heated, there are one or two short-circuit thermocouple points in each twist pitch. The signal processor can detect not only the location of the short-circuit point in the temperature-sensing cable but also the location of its temperature value. Attached Figure Description

[0014] 1. Figure 1 This is a schematic diagram of a temperature-sensing cable structure provided in Embodiment 1; 2. Figure 2This is a schematic diagram of a temperature-sensing cable structure provided in Embodiment 2; 3. Figure 3 This is a schematic diagram of a temperature-sensing cable structure provided in Embodiment 3; 4. Figure 4 This is a schematic diagram of a temperature-sensing cable structure provided in Example 4.

[0015] Explanation of the labels in the attached drawings: 1. First metal conductor; 3. Second metal conductor; 4. Third metal conductor; 6 / 6'. Fusible insulating material layer; 5. Insulation layer; 8. Metal shielding layer; 9. Insulating outer sheath layer; 10. High-strength insulated wire body. Detailed Implementation Example 1

[0016] like Figure 1 The diagram shows the structure of a temperature-sensing cable in a linear thermocouple temperature detector based on a switching quantity. The temperature-sensing cable includes a first metal conductor 1, a high-strength insulated wire 10, a second metal conductor 3, a fusible insulating material layer 6, and an insulating outer sheath 9. The high-strength insulated wire 10 and the second metal conductor 3 are arranged parallel to each other, and then twisted or wound together with the first metal conductor 1 covered with the fusible insulating material layer, and then covered with the insulating outer sheath 9. The first metal conductor 1 and the high-strength insulated wire 10 are elastic wires, and the first metal conductor 1 and the second metal conductor 3 are made of different metal materials.

[0017] To ensure a short circuit between the second metal conductor 3 and the first metal conductor 1 when the temperature-sensing cable is heated, an untwisting machine is used in the stranding or winding process during the manufacturing of the temperature-sensing cable. During stranding, the high-strength insulated wire 10 and the metal conductor 3 exit through a single conductor opening. The conductor opening is fixed by a mold to ensure that the high-strength insulated wire 10 and the second metal conductor 3 are positioned parallel to each other. This results in one short circuit point (i.e., a short-circuit thermocouple point) within one stranding pitch.

[0018] The signal processor (omitted in the diagram) monitors in real time whether the resistance between the first metal conductor 1 and the second metal conductor 3 of the temperature-sensing cable changes. When the ambient temperature of the temperature-sensing cable reaches the softening or melting temperature of the fusible insulation layer 6, the elastic stress between the first metal conductor 1 and the high-strength insulation wire 10 cuts the fusible insulation layer 6, creating a short circuit point, i.e., a thermocouple junction, between the first metal conductor 1 and the second metal conductor 3. When the thermoelectric potential detected by the signal processor between the first metal conductor 1 and the second metal conductor 3 is greater than or equal to the set over-temperature alarm threshold, an over-temperature alarm signal is output; when the detected thermoelectric potential is less than the set threshold, an over-temperature alarm signal is output. The system determines the output of a mechanical damage short-circuit fault alarm signal. (Firstly, in the event of a fire, the localized temperature of the heat-sensing cable will increase, not decrease. Therefore, when a short circuit occurs between the first metal conductor 1 and the second metal conductor 3, the thermoelectric potential detected by the signal processor will increase. Secondly, under normal circumstances, when a short circuit occurs between the first metal conductor 1 and the second metal conductor 3 in the heat-sensing cable due to external mechanical force, the thermoelectric potential detected by the signal processor will always be less than the set over-temperature alarm threshold. This is because the normal ambient temperature of the heat-sensing cable is always lower than the temperature corresponding to its over-temperature alarm threshold.) After outputting an over-temperature alarm signal or a short-circuit fault alarm signal, the signal processor detects the resistance of the circuit loop formed by the first metal conductor 1, the second metal conductor 3, and their short-circuit point, and calculates the location of the short-circuit point in the heat-sensing cable. The signal processor also detects the magnitude of the thermoelectric potential generated between the first metal conductor 1 and the second metal conductor 3, and calculates the temperature value of the heated short-circuit point.

[0019] To enhance the protection of the temperature sensing cable against electromagnetic interference in the environment, a metal shielding layer is provided on the outside of the temperature sensing cable in this embodiment.

[0020] In order to enable the detector to alarm due to temperature difference before the temperature sensing cable short-circuits in the event of a fire, the fusible insulating material layer 6 in this embodiment can also be replaced with a fusible material layer with NTC characteristics. Example 2

[0021] To improve the accuracy of short-circuit point location, this embodiment further improves upon the temperature-sensing cable provided in Embodiment 1 by adding a third metal conductor 4, symmetrical to the second metal conductor 3, outside the high-strength insulated wire body 10. The remaining structure remains unchanged. Figure 2 As shown.

[0022] To ensure that the second metal conductor 3 and the third metal conductor 4 form different short-circuit points with the first metal conductor 1 when the temperature-sensing cable is heated, an untwisting machine is used in the stranding or winding process during the manufacturing of the temperature-sensing cable. During stranding, the high-strength insulated wire 10 and the second metal conductor 3 and the third metal conductor 4 exit through a single conductor outlet. The conductor outlet is fixed by a mold to ensure that the high-strength insulated wire 10 and the second metal conductor 3 and the third metal conductor 4 are positioned parallel to each other. In this way, there is one short-circuit point (i.e., a short-circuit thermocouple point) in each stranding pitch, and the two short-circuit points are half a pitch apart.

[0023] Wherein, the second metal conductor 3 and the third metal conductor 4 are made of the same metal material, but are made of a different metal material than the first metal conductor 1; or, the second metal conductor 3 and the third metal conductor 4 are made of different metal materials, and are both made of a different metal material than the first metal conductor 1; or, the second metal conductor 3 and the third metal conductor 4 are made of the same metal material, and one of the second metal conductor 3 and the third metal conductor 4 is made of a different metal material than the first metal conductor 1.

[0024] 1) When the second metal conductor 3 and the third metal conductor 4 are made of the same metal material, but different metal material from the first metal conductor 1: When the temperature-sensing cable experiences localized overheating, the second metal conductor 3 and the third metal conductor 4 each create a short-circuit point with the first metal conductor 1, forming two different thermocouple junctions. Specifically, a thermocouple junction is formed between the second metal conductor 3 and the first metal conductor 1, and another between the second metal conductor 4 and the first metal conductor 1. The signal processor simultaneously detects the resistance of the circuit loop formed by the second metal conductor 3, the first metal conductor 1, and their short-circuit points; the resistance of the circuit loop formed by the second metal conductor 4, the first metal conductor 1, and their short-circuit points; and the resistance of the circuit loop formed by the second metal conductor 3, the first metal conductor 4, and their short-circuit points. By detecting these three resistance values, the accuracy of locating the short-circuit point in the temperature-sensing cable can be significantly improved.

[0025] 2) When the second metal conductor 3 and the third metal conductor 4 are made of different metal materials, and both are made of different metal materials than the first metal conductor 1: When the temperature-sensing cable experiences localized overheating, the second metal conductor 3 and the third metal conductor 4 each create a short-circuit point with the first metal conductor 1, forming two different thermocouple junctions. Specifically, a thermocouple junction is formed between the second metal conductor 3 and the first metal conductor 1, and another between the second metal conductor 4 and the first metal conductor 1. The signal processor simultaneously detects the resistance of the circuit loop formed by the second metal conductor 3, the first metal conductor 1, and their short-circuit points; the resistance of the circuit loop formed by the second metal conductor 4, the first metal conductor 1, and their short-circuit points; and the resistance of the circuit loop formed by the second metal conductor 3, the first metal conductor 4, and their short-circuit points. By detecting these three resistance values, the accuracy of locating the short-circuit point in the temperature-sensing cable can be significantly improved.

[0026] 3) When the second metal conductor 3 and the third metal conductor 4 are made of different metal materials, and one of the second metal conductor 3 and the third metal conductor 4 is made of the same metal material as the first metal conductor 1: When the temperature-sensing cable experiences localized overheating, the second metal conductor 3 and the third metal conductor 4 each create a short circuit with the first metal conductor 1, but there is only one thermocouple junction. That is, one of the second metal conductor 3 and the third metal conductor 4 forms a thermocouple junction with the first metal conductor 1. Thermocouple conductors 3 and 4 are each short-circuited to the first conductor. Thus, the signal processor simultaneously detects the resistance of the circuit loop formed by the second metal conductor 3, the first metal conductor 1, and their short circuit points; the resistance of the circuit loop formed by the second metal conductor 4, the first metal conductor 1, and their short circuit points; and the resistance of the circuit loop formed by the second metal conductor 3, the third metal conductor 4, and their short circuit points. By detecting these three resistance values, the accuracy of locating the short circuit point of the temperature-sensing cable can be greatly improved.

[0027] In this embodiment, the working principle of the output over-temperature alarm signal or short-circuit fault alarm signal of the switch quantity composite thermocouple linear temperature sensor is basically the same as that of the switch quantity composite thermocouple linear temperature sensor in Embodiment 1. Please refer to a part of the embodiment.

[0028] To enhance the protection of the temperature sensing cable against electromagnetic interference in the environment, a metal shielding layer is provided on the outside of the temperature sensing cable in this embodiment.

[0029] In order to enable the detector to alarm due to temperature difference before the temperature sensing cable short-circuits in the event of a fire, the fusible insulating material layer 6 in this embodiment can also be replaced with a fusible material layer with NTC characteristics. Example 3

[0030] To facilitate the manufacturing of the temperature-sensing cable in Embodiment 1, this embodiment further improves upon the temperature-sensing cable provided in Embodiment 1 as follows: the high-strength insulated wire 10 is arranged parallel to the second metal conductor 3, then covered with a fusible insulating material layer 6', and then twisted or wound together with the first metal conductor 1, and finally covered with an insulating outer sheath 9. The remaining structure remains unchanged. Figure 3 As shown. The working principle of this embodiment is the same as that of Embodiment 1, as described in a portion of the embodiment.

[0031] To enhance the protection of the temperature-sensing cable against electromagnetic interference in the environment, a metal shielding layer is provided inside or outside the insulating outer sheath of the temperature-sensing cable in this embodiment.

[0032] In order to enable the detector to alarm due to temperature difference before the temperature sensing cable short-circuits in the event of a fire, the fusible insulating material layer 6' in this embodiment can also be replaced with a fusible material layer with NTC characteristics.

[0033] In this embodiment, the fusible insulating material layer 6' can also be directly wrapped around the second metal conductor 3. Example 4

[0034] To facilitate the manufacturing of the temperature-sensing cable in Example 2, this example further improves upon the temperature-sensing cable provided in Example 2 by adding a third metal conductor 4 symmetrical to the second metal conductor 3 outside the high-strength insulated wire body 10. This third conductor 4 is then covered with a fusible insulating material layer 6', twisted or wound together with the first metal conductor 1, and finally covered with an insulating outer sheath 9. The remaining structural components remain unchanged. Figure 4 As shown. The working principle of this embodiment is the same as that of Embodiment 2, as described in the content of Embodiment 2.

[0035] To enhance the protection of the temperature-sensing cable against electromagnetic interference in the environment, a metal shielding layer is provided inside or outside the insulating outer sheath of the temperature-sensing cable in this embodiment.

[0036] In this embodiment, the fusible insulating material layer 6' can also be directly wrapped around the second metal conductor 3 and the third metal conductor 4 respectively.

[0037] In order to enable the detector to alarm due to temperature difference before the temperature sensing cable short-circuits in the event of a fire, the fusible insulating material layer 6' in this embodiment can also be replaced with a fusible material layer with NTC characteristics.

[0038] In this invention, both ends of the temperature-sensing cable can be connected to the signal processor simultaneously, improving positioning accuracy through simultaneous positioning at both ends of the temperature-sensing cable. Furthermore, if any part of the temperature-sensing cable is broken under external force, the signal processor can detect the operating status of both sections of the cable separately. When the temperature-sensing cable experiences localized overheating and reaches the alarm temperature, causing a short circuit, it can still output an alarm signal and positioning information.

[0039] In this invention, a pair of high-temperature resistant insulated wires or thermocouple compensation wires can be installed in parallel with the temperature sensing cable, and the two ends of the temperature sensing cable can be positioned simultaneously.

[0040] The first metal conductor 1 can be made of iron wire, steel wire, copper wire, stainless steel wire, nickel-chromium alloy wire, copper-nickel alloy wire, or nickel-silicon alloy wire, with a conductor diameter between 0.5mm and 1.0mm.

[0041] The materials for the second metal conductor 3 and the third metal conductor 4 can be nickel-chromium alloy wire, copper-nickel alloy wire, nickel-silicon alloy wire, or other metal alloy wires. The conductor diameter is between 0.2mm and 0.4mm.

[0042] Material of fusible insulating material layer 6 and fusible insulating material layer 6': Polyethylene, polypropylene, nylon, ethylene-vinyl acetate copolymer and other high molecular polymer materials with a Vicat softening point in the range of 40℃~230℃ can be selected, and the thickness is between 0.2mm and 0.6mm.

[0043] Material for the insulating outer sheath layer 9: Polyethylene, polypropylene, nylon, polyvinyl chloride, ethylene-vinyl acetate copolymer, fluoroplastics, and other high molecular polymer materials can be selected. The thickness is between 0.2mm and 0.6mm.

[0044] Twisting or winding pitch: between 10mm and 100mm.

[0045] High-strength insulator 10 materials: fiberglass strips, fiberglass resin strips, insulating fiber resin strips, with diameters between 0.5mm and 1.0mm.

[0046] Metal shielding layer: It is made of aluminum strip, copper strip, aluminum-plastic composite strip, copper-plastic composite strip or copper wire, stainless steel wire braiding, etc., using the common technology of conventional wires and cables.

[0047] NTC material: PVC composite NTC material or nylon composite NTC material can be selected.

[0048] The processing adopts common and conventional wire and cable manufacturing technology.

[0049] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, this invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this invention.

Claims

1. A switch-type composite thermocouple linear temperature detector, comprising a signal processor and a temperature-sensing cable connected thereto for detection, characterized in that, The temperature-sensing cable includes a first metal conductor, a high-strength insulated wire, a second metal conductor, a fusible insulation layer or an NTC-characteristic fusible insulation layer, and an insulating outer sheath. The high-strength insulated wire is arranged parallel to the second metal conductor, and then twisted or wound together with the first metal conductor covered with the fusible insulation layer or the NTC-characteristic fusible insulation layer. When any twist pitch of the temperature-sensing cable is heated, there is a short-circuit point in each twist pitch, before being covered with an insulating outer sheath. The first metal conductor and the high-strength insulated wire are elastic wires, and the first and second metal conductors are made of different metal materials.

2. The switch-signal composite thermocouple linear temperature sensor according to claim 1, characterized in that, Outside the high-strength insulated wire, a third metal conductor is provided that is symmetrical to the second metal conductor. Then, it is twisted or wound together with the first metal conductor covered with a fusible insulating material layer or an NTC characteristic fusible insulating material layer. When the temperature sensing cable is heated at any twist pitch, there is a short circuit point in each twist pitch, and they are half a pitch apart.

3. A switch-type composite thermocouple linear temperature detector, comprising a signal processor and a temperature-sensing cable connected thereto for detection, characterized in that, The temperature-sensing cable includes a first metal conductor, a high-strength insulated wire, a second metal conductor, a fusible insulation material layer or an NTC-characteristic fusible insulation material layer, and an insulating outer sheath. The high-strength insulated wire is arranged parallel to the second metal conductor, then covered with a fusible insulating material layer or an NTC-characteristic fusible insulating material layer, and then twisted or wound together with the first metal conductor. When any twist pitch of the temperature-sensing cable is heated, there is a short circuit point in each twist pitch, and then it is covered with an insulating outer sheath. The first metal conductor and the high-strength insulated wire are elastic wires, and the first metal conductor and the second metal conductor are made of different metal materials.

4. The linear thermocouple temperature sensor with switching quantity as described in claim 3, characterized in that, Outside the high-strength insulated wire, a third metal conductor is provided that is symmetrical to the second metal conductor. Then, it is twisted or wound together with the first metal conductor covered with a fusible insulating material layer or an NTC characteristic fusible insulating material layer. When the temperature sensing cable is heated at any twist pitch, there is a short circuit point in each twist pitch, and they are half a pitch apart.

5. The linear thermocouple temperature sensor with switching quantity as described in claim 1, 2, 3, or 4, characterized in that, The temperature-sensing cable is also provided with a metal shielding layer.

6. The linear thermocouple temperature sensor with switching quantity as described in claim 1, 2, 3, or 4, characterized in that, The signal processor is electrically connected to one end of the temperature sensing cable.

7. The linear thermocouple temperature sensor with switching quantity as described in claim 5, characterized in that, The signal processor is electrically connected to one end of the temperature sensing cable.

8. The linear thermocouple temperature sensor with switching quantity as described in claim 1, 2, 3, or 4, characterized in that, The signal processor is electrically connected to both ends of the temperature sensing cable.

9. The linear thermocouple temperature sensor with switching quantity as described in claim 5, characterized in that, The signal processor is electrically connected to both ends of the temperature sensing cable.

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