CN219225635U

CN219225635U - Fire alarm capable of monitoring open-short circuit fault of temperature sensing cable

Info

Publication number: CN219225635U
Application number: CN202320168033.1U
Authority: CN
Inventors: 吴凤岗; 韩丽丽; 蔡高秀
Original assignee: Jiangsu Haiteng Security Technology Co ltd
Current assignee: Jiangsu Haiteng Security Technology Co ltd
Priority date: 2023-02-09
Filing date: 2023-02-09
Publication date: 2023-06-20
Anticipated expiration: 2033-02-09

Abstract

The utility model relates to the technical field of circuit detection, in particular to a fire alarm capable of monitoring open-short circuit faults of a temperature-sensing cable, which comprises a signal processing unit, a terminal box and a temperature-sensing cable connected between the signal processing unit and the terminal box, wherein the temperature-sensing cable consists of a sheath, a metal shielding net and a thermosensitive material penetrated with metal wires, and the signal processing unit comprises an operation processing module, an electric signal module and an alarm output module. The fire alarm capable of monitoring the open-short circuit fault of the temperature sensing cable lays the temperature sensing cable on the power cable in a straight line, a winding type or a sine wave type, the temperature of the power cable is detected through a thermosensitive material in the temperature sensing cable, an electric signal of the temperature sensing cable is acquired through an electric signal acquisition module in a signal processing unit during operation, and when the temperature sensing cable with a certain length is heated to reach a set alarm temperature, the alarm is carried out through the signal processing unit.

Description

Fire alarm capable of monitoring open-short circuit fault of temperature sensing cable

Technical Field

The utility model relates to the technical field of circuit detection, in particular to a fire alarm capable of monitoring open-short circuit faults of a temperature-sensing cable.

Background

With the increase of fire and electricity consumption in society, the frequency of fire occurrence is higher and higher. Once a fire disaster occurs, adverse factors such as untimely extinguishing, lack of fire extinguishing equipment, panic and overwhelming of the bystanders, slow escape and the like easily occur, and finally, serious life and property losses are caused. In order to improve safety in the event of a fire, it is often necessary to provide fire alarms within the building. The fire alarm is a device for giving fire alarm to people, and the device is divided into two types, namely a manual mode for giving the fire alarm by manually pressing a bell and a fire sensor for automatically identifying and ringing the alarm.

The conventional fire sensors are various in variety and can be used in different environments, such as cable type linear temperature-sensing fire detectors for detecting the temperature of industrial cables. The detector generally comprises a signal processing unit, a terminal box and a temperature sensing cable, wherein the temperature sensing cable is arranged on an industrial cable to be detected, the temperature sensing cable adopts a two-core stranded cable structure and has a restorable function, a metal wire with the diameter of 0.6mm is adopted as a core wire of the temperature sensing cable, a thermosensitive material is arranged outside the metal wire, the impedance between the core wires changes along with the change of the surrounding temperature, when the temperature sensing cable with a certain length is heated to reach a set alarm temperature, the impedance between the core wires falls to a set alarm threshold range to alarm, and when the temperature sensing cable is restored to the environment temperature, the impedance between the core wires is restored to the original threshold. The signal processing unit is internally provided with a signal processing circuit which comprises a signal acquisition circuit, a signal amplification and conversion circuit and the like. The signal processing unit is connected with the temperature sensing cable with a certain length and the terminal box for use, and is used for continuously monitoring the temperature sensing cable, carrying out fire alarm on temperature rise caused by abnormal conditions and carrying out fault alarm on open circuit and short circuit of the temperature sensing cable. The cable type line type temperature-sensing fire detector in the prior art can detect the temperature of a cable through the resistance change of the temperature-sensing cable and detect the open circuit and the short circuit fault of the temperature-sensing cable through the acquisition and processing circuit in the signal processing unit, but can only realize the alarm for the detection of the temperature.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides a fire alarm capable of monitoring the open-short circuit fault of a temperature sensing cable, and solves the problems in the prior art.

In order to achieve the above purpose, the utility model is realized by the following technical scheme: the utility model provides a but fire alarm of monitoring temperature sensing cable open circuit fault, includes signal processing unit, terminal box and connects the temperature sensing cable between signal processing unit, terminal box, the temperature sensing cable comprises sheath, metal shielding net and the thermosensitive material who wears the wire, including operation processing module, electric signal acquisition module and alarm output module in the signal processing unit, be provided with a plurality of one-level binding post and a plurality of function switch in the signal processing unit, and be provided with the temperature setting switch that can set for the temperature in the signal processing unit, the inside of terminal box is provided with a plurality of second grade binding post, the both ends of temperature sensing cable are through one-level binding post, second grade binding post fixed connection in signal processing unit, terminal box, the side glue joint of temperature sensing cable has protective structure.

Preferably, the electric signal acquisition module is electrically connected with the temperature sensing cable, and the electric signal acquisition module comprises a front-end circuit, a filter circuit, an amplifying circuit and an AD conversion circuit, wherein the input end of the front-end circuit is electrically connected with the temperature sensing cable, the filter circuit, the amplifying circuit and the AD conversion circuit are sequentially connected behind the front-end circuit, and the output end of the AD conversion circuit is electrically connected with the operation processing module.

Preferably, the alarm output module comprises an alarm lamp and/or a buzzer.

Preferably, the functional switch is electrically connected with the operation processing module in the signal processing unit, and the functional switch is a fault test switch, a fire alarm test switch and a reset switch.

Preferably, the protection structure is composed of a plurality of protection air bags connected end to end, and sealing patches are glued on the protection air bags.

Preferably, the adjacent protective airbags are connected by adopting stitching, the sealing patches are positioned on one side of the protective airbags, which is close to the temperature sensing cable, and the number of the sealing patches is 4-6 groups.

The utility model provides a fire alarm capable of monitoring open-short circuit faults of a temperature-sensing cable, which has the following beneficial effects:

1. this but monitor fire alarm of temperature sensing cable open circuit fault lays the temperature sensing cable on power cable with sharp, winding or sine wave formula, detects power cable temperature through the thermosensitive material in the temperature sensing cable, gathers the signal acquisition module in the signal processing unit to the signal of telecommunication of temperature sensing cable when the operation, when the temperature sensing cable of certain length is heated and reaches the settlement alarm temperature, reports to the police through the signal processing unit, and after gathering the signal of telecommunication, handles the signal of telecommunication through the arithmetic processing module in the signal processing unit, can realize detecting temperature sensing cable open circuit, short circuit fault according to the size of signal of telecommunication.

2. This but monitor temperature sensing cable opens fire alarm of short circuit trouble, through set up the protective structure who comprises a plurality of head and tail connected protective airbag in the temperature sensing cable outside, when the high warning of temperature sensing cable operating temperature, the colloid that sealed paster and protective airbag are connected receives high temperature influence and melts, makes sealed paster drop, and the gas in the protective airbag can be spouted on the temperature sensing cable along sealed paster fixed point, and to temperature sensing cable high temperature department and building cable cooling, extension warning process time avoids temperature sensing cable and power cable high temperature damage.

Drawings

FIG. 1 is a schematic diagram of the overall assembled structure of the present utility model;

FIG. 2 is a schematic cross-sectional view of a temperature sensing cable according to the present utility model;

FIG. 3 is a schematic diagram of the signal processing unit and the terminal box according to the present utility model;

FIG. 4 is a schematic diagram of the combination of the temperature sensing cable and the protection structure of the present utility model;

fig. 5 is a schematic structural view of the protection structure of the present utility model.

In the figure: 1. a signal processing unit; 2. a terminal box; 3. a temperature sensing cable; 31. a sheath; 32. a metal shielding net; 33. a heat sensitive material; 4. a fault light; 5. a function switch; 6. a temperature setting switch; 7. a first-stage wiring terminal; 8. a secondary wiring terminal; 9. a protective structure; 91. a protective airbag; 92. and sealing the patch.

Description of the embodiments

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

Referring to fig. 1 and 3, the present utility model provides a technical solution: the utility model provides a but fire alarm of monitoring temperature sensing cable open circuit fault, including signal processing unit 1, terminal box 2 and connect the temperature sensing cable 3 between signal processing unit 1, terminal box 2, temperature sensing cable 3 comprises sheath 31, metal shielding net 32 and wear the heat-sensitive material 33 of metal wire, include operation processing module in the signal processing unit 1, signal acquisition module and alarm output module, be provided with a plurality of one-level binding post 7 and a plurality of function switch 5 in the signal processing unit 1, the one-level binding post 7 in the signal processing unit 1 altogether 13 groups, terminal 1 ~ 4: the DC24V power supply terminal, wherein 1 and 2 are anodes of a power supply DC24V, and 3 and 4 are cathodes of the power supply DC 24V; terminals 5, 6: temperature sensing cable access terminal, aluminum foil wrapped white core wire terminal 5, unwrapped aluminum foil core wire terminal 6, terminals 7, 8: feedback resistor of input/output module is connected, terminals 9, 10: closing and outputting when the fire alarm relay alarms; terminals 11, 13: closing and outputting when the fault alarm relay fails; terminals 12, 13: the output is disconnected when the fault alarm relay breaks down, the both ends of temperature sensing cable 3 pass through one-level binding post 7, second grade binding post 8 fixed connection is in signal processing unit 1, terminal box 2, the side of temperature sensing cable 3 glues has protective structure 9, through set up the protective structure 9 that comprises a plurality of head and tail connection's protective airbag 91 in temperature sensing cable 3 outside, when temperature sensing cable 3 operating temperature is too high and reported to the police, the colloid that sealed paster 92 and protective airbag 91 are connected receives high temperature influence and melts, make sealed paster 92 drop, the gas in protective airbag 91 can spout on temperature sensing cable 3 along sealed paster 92 fixed point and cool down, and be provided with the temperature setting switch 6 that can set for the temperature in the signal processing unit 1, the inside of terminal box 2 is provided with a plurality of second grade binding post 8, the quantity of second grade binding post 8 is two sets of respectively for L1, L2, L1, L2 is provided with the fault lamp 4 of being connected with operation processing module electric property through the conductor and the signal processing unit's of temperature sensing cable respectively.

The electric signal acquisition module is electrically connected with the temperature sensing cable 3, and comprises a front-end circuit, a filter circuit, an amplifying circuit and an AD conversion circuit, wherein the input end of the front-end circuit is electrically connected with the temperature sensing cable 3, the temperature of the power cable is detected through a thermosensitive material 33 in the temperature sensing cable 3, the electric signal of the temperature sensing cable 3 is acquired through the electric signal acquisition module in the signal processing unit 1 during operation, when the temperature sensing cable 3 with a certain length is heated to reach a set alarm temperature, the alarm is carried out through the signal processing unit 1, the filter circuit, the amplifying circuit and the AD conversion circuit are sequentially connected after the front-end circuit, the output end of the AD conversion circuit is electrically connected with the operation processing module, the electric signal is processed through the operation processing module in the signal processing unit 1 after the electric signal is acquired, and the open circuit and short circuit fault of the temperature sensing cable 3 can be detected according to the size of the electric signal.

The alarm output module comprises an alarm lamp and/or a buzzer, and when the signal processing unit 1 detects that the temperature of the temperature sensing cable 3 with a certain length exceeds a set value, the signal processing unit 1 can control the alarm output module to start to alarm.

The functional switch 5 is electrically connected with the operation processing module in the signal processing unit 1, and the functional switch 5 is a fault test switch, a fire alarm test switch and a reset switch.

Referring to fig. 2, 4 and 5, the protection structure 9 is composed of a plurality of protection air bags 91 connected end to end, a sealing patch 92 is glued on the protection air bags 91, the sealing patch 92 is glued on the protection air bags 91 through high-temperature melted glue, the type of the glue can be selected according to the set alarm temperature of the temperature sensing cable 3, and an air outlet hole matched with the sealing patch 92 is formed in the protection air bags 91.

Adjacent protective air bags 91 adopt to sew up the connection, make up a plurality of protective air bags 91 into a whole, guarantee the stability of its connection simultaneously, seal paster 92 is located the protective air bag 91 and is close to one side of temperature sensing cable 3, guarantees that along seal paster 92 spun gas can spout on temperature sensing cable 3, realizes the cooling treatment to temperature sensing cable 3 and power cable, and seal paster 92's quantity is 4-6 group, realizes the multiple spot exhaust, guarantees the radiating effect.

In summary, when the fire alarm capable of monitoring open-circuit and short-circuit faults of the temperature sensing cable is used, the temperature sensing cable 3 is laid on the power cable in a linear, winding or sine wave mode, when the power cable runs, the impedance of the temperature sensing material 33 in the temperature sensing cable 3 changes along with the change of the surrounding temperature, an electric signal acquisition module in the signal processing unit 1 acquires the electric signal of the temperature sensing cable 3, the impedance of the temperature sensing material 33 and the current are acquired, an operation processing module in the signal processing unit 1 calculates the temperature of each part of the temperature sensing cable 3 according to the impedance, when the temperature sensing cable 3 with a certain length is heated to reach a set alarm temperature, the signal processing unit 1 controls the alarm module therein to alarm, meanwhile, the operation processing module in the signal processing unit 1 calculates the current of the temperature sensing cable 3, when the current is 0, the open-circuit phenomenon is shown by the temperature sensing cable 3, when the current is overlarge, the short-circuit phenomenon is shown by the existence, when the temperature sensing cable 3 is detected to be partially, the protective air bag 91 and sealing patch 92 at the position of the temperature sensing cable 3 are connected with colloid and are melted under the influence of high temperature, so that the sealing patch 92 falls off, when the gas in the protective air bag 91 such as carbon dioxide gas is exhausted to the outside the cable and the sealing patch is exhausted to the power cable, the high enough time is enough to cool the reaction time, and the reaction time can be prolonged.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be constructed and operated in the specific direction, and thus should not be construed as limiting the present utility model; the terms "first," "second," "third," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "coupled," and the like are to be construed broadly, and may be fixedly coupled, detachably coupled, or integrally coupled, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a but fire alarm of monitoring temperature sensing cable open circuit fault, includes signal processing unit (1), terminal box (2) and connects temperature sensing cable (3) between signal processing unit (1), terminal box (2), temperature sensing cable (3) are by sheath (31), metal shielding net (32) and wear to have heat sensitive material (33) of wire, its characterized in that: the temperature-sensitive cable is characterized in that the signal processing unit (1) comprises an operation processing module, an electric signal acquisition module and an alarm output module, a plurality of primary wiring terminals (7) and a plurality of functional switches (5) are arranged in the signal processing unit (1), a temperature setting switch (6) capable of setting the temperature is arranged in the signal processing unit (1), a plurality of secondary wiring terminals (8) are arranged in the terminal box (2), two ends of the temperature-sensitive cable (3) are fixedly connected in the signal processing unit (1) and the terminal box (2) through the primary wiring terminals (7) and the secondary wiring terminals (8), and a protective structure (9) is adhered to the side face of the temperature-sensitive cable (3).

2. A fire alarm for monitoring open-circuit and short-circuit faults of temperature sensing cables as claimed in claim 1, wherein: the electric signal acquisition module is electrically connected with the temperature sensing cable (3), and comprises a front-end circuit, a filter circuit, an amplifying circuit and an AD conversion circuit, wherein the input end of the front-end circuit is electrically connected with the temperature sensing cable (3), the filter circuit, the amplifying circuit and the AD conversion circuit are sequentially connected behind the front-end circuit, and the output end of the AD conversion circuit is electrically connected with the operation processing module.

3. A fire alarm for monitoring open-circuit and short-circuit faults of temperature sensing cables as claimed in claim 1, wherein: the alarm output module comprises an alarm lamp and/or a buzzer.

4. A fire alarm for monitoring open-circuit and short-circuit faults of temperature sensing cables as claimed in claim 1, wherein: the functional switch (5) is electrically connected with the operation processing module in the signal processing unit (1), and the functional switch (5) is a fault test switch, a fire alarm test switch and a reset switch.

5. A fire alarm for monitoring open-circuit and short-circuit faults of temperature sensing cables as claimed in claim 1, wherein: the protective structure (9) consists of a plurality of protective air bags (91) connected end to end, and sealing patches (92) are glued on the protective air bags (91).

6. A fire alarm for monitoring open-circuit and short-circuit faults of temperature sensing cables as claimed in claim 5, wherein: the adjacent protective airbags (91) are connected by adopting stitching, the sealing patches (92) are positioned on one side of the protective airbags (91) close to the temperature sensing cable (3), and the number of the sealing patches (92) is 4-6 groups.