Non-destructive alarm detection device for irreversible temperature sensing cable

Abstract

The present invention discloses a non-destructive alarm detection device for an irreversible temperature-sensing cable. The device comprises an insulating base plate, a variable resistor, a copper core short-circuit wire and a copper core conductor pin. The insulating base plate is provided with an A-end through hole, a B-end through hole and a C-end through hole at intervals. The copper core conductor pins are respectively arranged at the A-end through hole, the B-end through hole and the C-end through hole. The copper core short-circuit wire is connected to the copper core conductor pins of the B-end through hole and the C-end through hole. The two ends of the variable resistor are respectively connected to the copper core conductor pins of the A-end through hole and the B-end through hole. The device overcomes the defects of the traditional irreversible temperature-sensing cable alarm temperature detection, and quickly performs a fire alarm temperature test without destroying the temperature-sensing cable, so as to achieve the purpose of non-destructive, rapid and accurate detection, save manpower and material resources, and improve the detection operation efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of fire-fighting equipment and devices, and in particular to a non-destructive alarm detection device for an irreversible temperature-sensitive cable. Background Art

[0002] Linear temperature-sensing fire detectors are widely used in underground tunnels, transformers and other places due to their high sensitivity, strong resistance to mechanical damage, corrosion resistance, and wear resistance. Linear temperature-sensing fire detectors are generally connected by restorable temperature-sensing cables or irreversible temperature-sensing cables. Restorable temperature-sensing cables are easy to maintain and detect, but the cost is high; irreversible temperature-sensing cables are difficult to maintain and detect, but the cost is low. At present, the latest irreversible temperature-sensing cable has three cores, consisting of three steel core conductors, and connected to the three terminals A, B, and C respectively; the steel cores at the A end and the C end are coated with a thermal insulation layer material, and the steel core at the A end is wrapped with a layer of aluminum-plastic composite tape outside the thermal insulation layer, which is separated from the steel cores at the B end and the C end, and different sheath layers are configured according to different temperatures. The three-core irreversible temperature-sensing cable is laid between the terminal box and the starting box. The terminal box is equipped with three resistors that interact with the signal processing device of the starting box to keep the three-core irreversible temperature-sensing cable in a normal temperature monitoring state. When the ambient temperature rises to the temperature at which the temperature sensing cable is configured, an alarm signal is issued and transmitted from the starting box to the fire alarm controller.

[0003] At present, during the annual inspection or final acceptance inspection of temperature-sensitive cables, alarm temperature is used for destructive testing. A section of residual temperature-sensitive cable is taken from the place near the terminal box as the test section. The test section is tested according to different alarm temperatures. After the inspection, the test section is cut off for recovery. This inspection process is very difficult, consuming a lot of manpower and material resources. The inspection operation is time-consuming, inefficient and destructive. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a non-destructive alarm detection device for an irreversible temperature-sensing cable. The device overcomes the defects of traditional irreversible temperature-sensing cable alarm temperature detection, and quickly performs fire alarm temperature test without destroying the temperature-sensing cable, thereby achieving the purpose of non-destructive, rapid and accurate detection, saving manpower and material resources, and improving detection efficiency.

[0005] In order to solve the above technical problems, the non-destructive alarm detection device of the irreversible temperature sensing cable of the present invention includes an insulating base plate, a variable resistor, a copper core short-circuit wire and a copper core wire pin. The insulating base plate is provided with an A-end through hole, a B-end through hole and a C-end through hole at intervals. The copper core wire pins are respectively arranged at the A-end through hole, the B-end through hole and the C-end through hole. The copper core short-circuit wire connects the copper core wire pins of the B-end through hole and the C-end through hole, and the two ends of the variable resistor are respectively connected to the copper core wire pins of the A-end through hole and the B-end through hole.

[0006] Furthermore, the insulating bottom plate is 24 mm long, 10 mm wide and 2 mm thick.

[0007] Furthermore, the diameters of the through holes at the A end, the B end, and the C end on the insulating bottom plate are all 1.8 mm.

[0008] Furthermore, the resistance of the variable resistor is 200 kΩ to 3000 kΩ.

[0009] Furthermore, the hole center spacing between the through hole at the A end, the through hole at the B end and the through hole at the C end is 6 mm.

[0010] Furthermore, the length of the copper core wire pin is 15 mm and the cross-sectional area is 2.5 mm 2 .

[0011] Furthermore, the cross-sectional area of ​​the copper core short-circuit is 0.75 mm 2 .

[0012] Furthermore, the variable resistor, the copper core short-circuit wire and the copper core wire pin are connected by soldering.

[0013] Since the non-destructive alarm detection device of the irreversible temperature-sensing cable of the present invention adopts the above-mentioned technical scheme, that is, the device includes an insulating base plate, a variable resistor, a copper core short-circuit wire and a copper core conductor pin, the insulating base plate is provided with an A-end through hole, a B-end through hole and a C-end through hole at intervals, the copper core conductor pins are respectively arranged at the A-end through hole, the B-end through hole and the C-end through hole, the copper core short-circuit wire connects the copper core conductor pins of the B-end through hole and the C-end through hole, and the two ends of the variable resistor are respectively connected to the copper core conductor pins of the A-end through hole and the B-end through hole. The device overcomes the defects of the traditional irreversible temperature-sensing cable alarm temperature detection, and quickly performs a fire alarm temperature test without destroying the temperature-sensing cable, so as to achieve the purpose of non-destructive, rapid and accurate detection, save manpower and material resources, and improve the detection operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0015] Figure 1 It is a schematic diagram of a non-destructive alarm detection device for an irreversible temperature sensing cable of the present invention;

[0016] Figure 2 for Figure 1 Top view of the . DETAILED DESCRIPTION

[0017] Implementation example Figure 1 and Figure 2 As shown, the non-destructive alarm detection device of the irreversible temperature sensing cable of the present invention comprises an insulating base plate 1, a variable resistor 2, a copper core short-circuit wire 3 and a copper core wire pin 4, the insulating base plate 1 is provided with an A-end through hole, a B-end through hole and a C-end through hole at intervals, the copper core wire pin 4 is respectively arranged at the A-end through hole, the B-end through hole and the C-end through hole, the copper core short-circuit wire 3 connects the copper core wire pin 4 of the B-end through hole and the C-end through hole, and the two ends of the variable resistor 2 are respectively connected to the copper core wire pin 4 of the A-end through hole and the B-end through hole.

[0018] Preferably, the insulating base plate 1 is 24 mm long, 10 mm wide and 2 mm thick.

[0019] Preferably, the diameters of the through holes at the A end, the B end, and the C end on the insulating base plate 1 are all 1.8 mm.

[0020] Preferably, the resistance of the variable resistor 2 is 200 kΩ to 3000 kΩ.

[0021] Preferably, the hole center spacing between the through hole at the A end, the through hole at the B end and the through hole at the C end is 6 mm.

[0022] Preferably, the length of the copper core wire pin 4 is 15 mm and the cross-sectional area is 2.5 mm 2 .

[0023] Preferably, the cross-sectional area of ​​the copper core short-circuit wire 3 is 0.75 mm 2 .

[0024] Preferably, the variable resistor 2, the copper core short-circuit wire 3 and the copper core wire pin 4 are connected by soldering.

[0025] During the actual inspection of the irreversible temperature-sensitive cable, select a section of the temperature-sensitive cable corresponding to the temperature-sensitive cable tray, and determine the positions of the terminal box and the starting box; open the terminal box, determine the A, B, and C terminals of the temperature-sensitive cable, and sequentially contact the three copper-core wire pins of the device to the A, B, and C steel-core conductors of the corresponding positions of the temperature-sensitive cable; simulate the alarm temperature by changing the resistance value of the variable resistor, and observe the changes in the signal processing device of the starting box. After about 2 seconds, the starting box receives the alarm temperature signal and transmits the alarm temperature signal to the fire alarm controller at the same time; the fire alarm controller sends a series of linkage instructions based on the logical relationship, and confirms on site whether each device acts according to the linkage instructions to realize the linkage detection of the fire protection system; after the detection is completed, the corresponding device is reset and the detection operation is completed.

[0026] This device uses the short circuit between the steel core conductor at the B end and the steel core conductor at the C end, and at the same time, the resistance between the steel core conductor at the A end and the steel core conductor at the B end changes to a certain extent. When the change value reaches the alarm threshold, the signal processing device of the starting box outputs an alarm signal to the fire alarm controller to realize the detection of the temperature-sensitive cable. This device replaces the original destructive test to achieve rapid non-destructive alarm temperature detection, saving at least 90% of consumables, 50% of manpower, and improving 50% efficiency. The detection process can be completed by one person independently without the need to increase wiring personnel; it can 100% eliminate safety hazards; it can realize the whole process detection from the terminal to the starting end of the temperature-sensitive cable. The whole process starts from the terminal box, passes through the entire section of the temperature-sensitive cable, to the signal processing device of the starting box, and then to the fire alarm controller, and sends out a fire alarm signal, which can achieve the whole process detection effect and realize fast and accurate simulation fire alarm detection.

Claims

1. A non-destructive alarm detection device for an irreversible temperature sensing cable, characterized in that: The device includes an insulating base plate, a variable resistor, a copper core short-circuit wire and a copper core conductor pin. The insulating base plate is provided with an A-end through hole, a B-end through hole and a C-end through hole at intervals. The copper core conductor pins are respectively arranged at the A-end through hole, the B-end through hole and the C-end through hole. The copper core short-circuit wire is connected to the copper core conductor pins of the B-end through hole and the C-end through hole. The two ends of the variable resistor are respectively connected to the copper core conductor pins of the A-end through hole and the B-end through hole. The three copper core conductor pins are in contact with the three steel core conductors A, B and C at the corresponding positions of the temperature sensing cable. The alarm temperature is simulated by changing the resistance value of the variable resistor, and the changes of the signal processing device of the starting box are observed. After 2 seconds, the starting box receives the alarm temperature signal and transmits the alarm temperature signal to the fire alarm controller at the same time.

2. The non-destructive alarm detection device for the irreversible temperature sensing cable according to claim 1 is characterized in that: The insulating bottom plate is 24 mm long, 10 mm wide and 2 mm thick.

3. The non-destructive alarm detection device for the irreversible temperature sensing cable according to claim 1 is characterized in that: The diameters of the through holes at the A end, the B end and the C end on the insulating bottom plate are all 1.8 mm.

4. The non-destructive alarm detection device for the irreversible temperature sensing cable according to claim 1 is characterized in that: The hole center spacing between the A-end through hole, the B-end through hole and the C-end through hole is 6 mm.

5. The non-destructive alarm detection device for the irreversible temperature sensing cable according to claim 1 is characterized in that: The resistance of the variable resistor is 200 kΩ to 3000 kΩ.

6. The non-destructive alarm detection device for the irreversible temperature sensing cable according to claim 1 is characterized in that: The cross-sectional area of ​​the copper core short-circuit is 0.75mm 2 .

7. The non-destructive alarm detection device for the irreversible temperature sensing cable according to claim 1 is characterized in that: The copper core wire pin has a length of 15 mm and a cross-sectional area of ​​2.5 mm. 2 .

8. The non-destructive alarm detection device for the irreversible temperature sensing cable according to claim 1 is characterized in that: The variable resistor, the copper core short-circuit wire and the copper core wire pin are connected by soldering.

Images